net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
   9  *
  10  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17
  18 /* Changes:
  19  *
  20  *      yoshfuji        : fix format of router-alert option
  21  *      YOSHIFUJI Hideaki @USAGI:
  22  *              Fixed source address for MLD message based on
  23  *              <draft-ietf-magma-mld-source-05.txt>.
  24  *      YOSHIFUJI Hideaki @USAGI:
  25  *              - Ignore Queries for invalid addresses.
  26  *              - MLD for link-local addresses.
  27  *      David L Stevens <dlstevens@us.ibm.com>:
  28  *              - MLDv2 support
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/errno.h>
  33 #include <linux/types.h>
  34 #include <linux/string.h>
  35 #include <linux/socket.h>
  36 #include <linux/sockios.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/times.h>
  39 #include <linux/net.h>
  40 #include <linux/in.h>
  41 #include <linux/in6.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/route.h>
  45 #include <linux/init.h>
  46 #include <linux/proc_fs.h>
  47 #include <linux/seq_file.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/sock.h>
  53 #include <net/snmp.h>
  54
  55 #include <net/ipv6.h>
  56 #include <net/protocol.h>
  57 #include <net/if_inet6.h>
  58 #include <net/ndisc.h>
  59 #include <net/addrconf.h>
  60 #include <net/ip6_route.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 struct socket *igmp6_socket;
 129
 130 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
 131
 132 static void igmp6_join_group(struct ifmcaddr6 *ma);
 133 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 134 static void igmp6_timer_handler(unsigned long data);
 135
 136 static void mld_gq_timer_expire(unsigned long data);
 137 static void mld_ifc_timer_expire(unsigned long data);
 138 static void mld_ifc_event(struct inet6_dev *idev);
 139 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 140 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 141 static void mld_clear_delrec(struct inet6_dev *idev);
 142 static int sf_setstate(struct ifmcaddr6 *pmc);
 143 static void sf_markstate(struct ifmcaddr6 *pmc);
 144 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 145 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 146                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 147                           int delta);
 148 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 149                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 150                           int delta);
 151 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 152                             struct inet6_dev *idev);
 153
 154
 155 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 156 #define MLD_QRV_DEFAULT         2
 157
 158 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
 159                 (idev)->cnf.force_mld_version == 1 || \
 160                 ((idev)->mc_v1_seen && \
 161                 time_before(jiffies, (idev)->mc_v1_seen)))
 162
 163 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 164 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 165         ((value) < (thresh) ? (value) : \
 166         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
 167         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 168
 169 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
 170 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 171
 172 #define IPV6_MLD_MAX_MSF        64
 173
 174 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 175
 176 /*
 177  *      socket join on multicast group
 178  */
 179
 180 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
 181 {
 182         struct net_device *dev = NULL;
 183         struct ipv6_mc_socklist *mc_lst;
 184         struct ipv6_pinfo *np = inet6_sk(sk);
 185         int err;
 186
 187         if (!ipv6_addr_is_multicast(addr))
 188                 return -EINVAL;
 189
 190         read_lock_bh(&ipv6_sk_mc_lock);
 191         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 192                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 193                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 194                         read_unlock_bh(&ipv6_sk_mc_lock);
 195                         return -EADDRINUSE;
 196                 }
 197         }
 198         read_unlock_bh(&ipv6_sk_mc_lock);
 199
 200         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 201
 202         if (mc_lst == NULL)
 203                 return -ENOMEM;
 204
 205         mc_lst->next = NULL;
 206         ipv6_addr_copy(&mc_lst->addr, addr);
 207
 208         if (ifindex == 0) {
 209                 struct rt6_info *rt;
 210                 rt = rt6_lookup(addr, NULL, 0, 0);
 211                 if (rt) {
 212                         dev = rt->rt6i_dev;
 213                         dev_hold(dev);
 214                         dst_release(&rt->u.dst);
 215                 }
 216         } else
 217                 dev = dev_get_by_index(ifindex);
 218
 219         if (dev == NULL) {
 220                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 221                 return -ENODEV;
 222         }
 223
 224         mc_lst->ifindex = dev->ifindex;
 225         mc_lst->sfmode = MCAST_EXCLUDE;
 226         rwlock_init(&mc_lst->sflock);
 227         mc_lst->sflist = NULL;
 228
 229         /*
 230          *      now add/increase the group membership on the device
 231          */
 232
 233         err = ipv6_dev_mc_inc(dev, addr);
 234
 235         if (err) {
 236                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 237                 dev_put(dev);
 238                 return err;
 239         }
 240
 241         write_lock_bh(&ipv6_sk_mc_lock);
 242         mc_lst->next = np->ipv6_mc_list;
 243         np->ipv6_mc_list = mc_lst;
 244         write_unlock_bh(&ipv6_sk_mc_lock);
 245
 246         dev_put(dev);
 247
 248         return 0;
 249 }
 250
 251 /*
 252  *      socket leave on multicast group
 253  */
 254 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 255 {
 256         struct ipv6_pinfo *np = inet6_sk(sk);
 257         struct ipv6_mc_socklist *mc_lst, **lnk;
 258
 259         write_lock_bh(&ipv6_sk_mc_lock);
 260         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 261                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 262                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 263                         struct net_device *dev;
 264
 265                         *lnk = mc_lst->next;
 266                         write_unlock_bh(&ipv6_sk_mc_lock);
 267
 268                         if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
 269                                 struct inet6_dev *idev = in6_dev_get(dev);
 270
 271                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 272                                 if (idev) {
 273                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 274                                         in6_dev_put(idev);
 275                                 }
 276                                 dev_put(dev);
 277                         } else
 278                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 279                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 280                         return 0;
 281                 }
 282         }
 283         write_unlock_bh(&ipv6_sk_mc_lock);
 284
 285         return -EADDRNOTAVAIL;
 286 }
 287
 288 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
 289 {
 290         struct net_device *dev = NULL;
 291         struct inet6_dev *idev = NULL;
 292
 293         if (ifindex == 0) {
 294                 struct rt6_info *rt;
 295
 296                 rt = rt6_lookup(group, NULL, 0, 0);
 297                 if (rt) {
 298                         dev = rt->rt6i_dev;
 299                         dev_hold(dev);
 300                         dst_release(&rt->u.dst);
 301                 }
 302         } else
 303                 dev = dev_get_by_index(ifindex);
 304
 305         if (!dev)
 306                 return NULL;
 307         idev = in6_dev_get(dev);
 308         if (!idev) {
 309                 dev_put(dev);
 310                 return NULL;
 311         }
 312         read_lock_bh(&idev->lock);
 313         if (idev->dead) {
 314                 read_unlock_bh(&idev->lock);
 315                 in6_dev_put(idev);
 316                 dev_put(dev);
 317                 return NULL;
 318         }
 319         return idev;
 320 }
 321
 322 void ipv6_sock_mc_close(struct sock *sk)
 323 {
 324         struct ipv6_pinfo *np = inet6_sk(sk);
 325         struct ipv6_mc_socklist *mc_lst;
 326
 327         write_lock_bh(&ipv6_sk_mc_lock);
 328         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 329                 struct net_device *dev;
 330
 331                 np->ipv6_mc_list = mc_lst->next;
 332                 write_unlock_bh(&ipv6_sk_mc_lock);
 333
 334                 dev = dev_get_by_index(mc_lst->ifindex);
 335                 if (dev) {
 336                         struct inet6_dev *idev = in6_dev_get(dev);
 337
 338                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 339                         if (idev) {
 340                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 341                                 in6_dev_put(idev);
 342                         }
 343                         dev_put(dev);
 344                 } else
 345                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 346
 347                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 348
 349                 write_lock_bh(&ipv6_sk_mc_lock);
 350         }
 351         write_unlock_bh(&ipv6_sk_mc_lock);
 352 }
 353
 354 int ip6_mc_source(int add, int omode, struct sock *sk,
 355         struct group_source_req *pgsr)
 356 {
 357         struct in6_addr *source, *group;
 358         struct ipv6_mc_socklist *pmc;
 359         struct net_device *dev;
 360         struct inet6_dev *idev;
 361         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 362         struct ip6_sf_socklist *psl;
 363         int i, j, rv;
 364         int leavegroup = 0;
 365         int pmclocked = 0;
 366         int err;
 367
 368         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 369             pgsr->gsr_source.ss_family != AF_INET6)
 370                 return -EINVAL;
 371
 372         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 373         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 374
 375         if (!ipv6_addr_is_multicast(group))
 376                 return -EINVAL;
 377
 378         idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
 379         if (!idev)
 380                 return -ENODEV;
 381         dev = idev->dev;
 382
 383         err = -EADDRNOTAVAIL;
 384
 385         read_lock_bh(&ipv6_sk_mc_lock);
 386         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 387                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 388                         continue;
 389                 if (ipv6_addr_equal(&pmc->addr, group))
 390                         break;
 391         }
 392         if (!pmc) {             /* must have a prior join */
 393                 err = -EINVAL;
 394                 goto done;
 395         }
 396         /* if a source filter was set, must be the same mode as before */
 397         if (pmc->sflist) {
 398                 if (pmc->sfmode != omode) {
 399                         err = -EINVAL;
 400                         goto done;
 401                 }
 402         } else if (pmc->sfmode != omode) {
 403                 /* allow mode switches for empty-set filters */
 404                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 405                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 406                 pmc->sfmode = omode;
 407         }
 408
 409         write_lock_bh(&pmc->sflock);
 410         pmclocked = 1;
 411
 412         psl = pmc->sflist;
 413         if (!add) {
 414                 if (!psl)
 415                         goto done;      /* err = -EADDRNOTAVAIL */
 416                 rv = !0;
 417                 for (i=0; i<psl->sl_count; i++) {
 418                         rv = memcmp(&psl->sl_addr[i], source,
 419                                 sizeof(struct in6_addr));
 420                         if (rv == 0)
 421                                 break;
 422                 }
 423                 if (rv)         /* source not found */
 424                         goto done;      /* err = -EADDRNOTAVAIL */
 425
 426                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 427                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 428                         leavegroup = 1;
 429                         goto done;
 430                 }
 431
 432                 /* update the interface filter */
 433                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 434
 435                 for (j=i+1; j<psl->sl_count; j++)
 436                         psl->sl_addr[j-1] = psl->sl_addr[j];
 437                 psl->sl_count--;
 438                 err = 0;
 439                 goto done;
 440         }
 441         /* else, add a new source to the filter */
 442
 443         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 444                 err = -ENOBUFS;
 445                 goto done;
 446         }
 447         if (!psl || psl->sl_count == psl->sl_max) {
 448                 struct ip6_sf_socklist *newpsl;
 449                 int count = IP6_SFBLOCK;
 450
 451                 if (psl)
 452                         count += psl->sl_max;
 453                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 454                 if (!newpsl) {
 455                         err = -ENOBUFS;
 456                         goto done;
 457                 }
 458                 newpsl->sl_max = count;
 459                 newpsl->sl_count = count - IP6_SFBLOCK;
 460                 if (psl) {
 461                         for (i=0; i<psl->sl_count; i++)
 462                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 463                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 464                 }
 465                 pmc->sflist = psl = newpsl;
 466         }
 467         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 468         for (i=0; i<psl->sl_count; i++) {
 469                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 470                 if (rv == 0)
 471                         break;
 472         }
 473         if (rv == 0)            /* address already there is an error */
 474                 goto done;
 475         for (j=psl->sl_count-1; j>=i; j--)
 476                 psl->sl_addr[j+1] = psl->sl_addr[j];
 477         psl->sl_addr[i] = *source;
 478         psl->sl_count++;
 479         err = 0;
 480         /* update the interface list */
 481         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 482 done:
 483         if (pmclocked)
 484                 write_unlock_bh(&pmc->sflock);
 485         read_unlock_bh(&ipv6_sk_mc_lock);
 486         read_unlock_bh(&idev->lock);
 487         in6_dev_put(idev);
 488         dev_put(dev);
 489         if (leavegroup)
 490                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 491         return err;
 492 }
 493
 494 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 495 {
 496         struct in6_addr *group;
 497         struct ipv6_mc_socklist *pmc;
 498         struct net_device *dev;
 499         struct inet6_dev *idev;
 500         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 501         struct ip6_sf_socklist *newpsl, *psl;
 502         int leavegroup = 0;
 503         int i, err;
 504
 505         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 506
 507         if (!ipv6_addr_is_multicast(group))
 508                 return -EINVAL;
 509         if (gsf->gf_fmode != MCAST_INCLUDE &&
 510             gsf->gf_fmode != MCAST_EXCLUDE)
 511                 return -EINVAL;
 512
 513         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 514
 515         if (!idev)
 516                 return -ENODEV;
 517         dev = idev->dev;
 518
 519         err = 0;
 520         read_lock_bh(&ipv6_sk_mc_lock);
 521
 522         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 523                 leavegroup = 1;
 524                 goto done;
 525         }
 526
 527         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 528                 if (pmc->ifindex != gsf->gf_interface)
 529                         continue;
 530                 if (ipv6_addr_equal(&pmc->addr, group))
 531                         break;
 532         }
 533         if (!pmc) {             /* must have a prior join */
 534                 err = -EINVAL;
 535                 goto done;
 536         }
 537         if (gsf->gf_numsrc) {
 538                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 539                                                           GFP_ATOMIC);
 540                 if (!newpsl) {
 541                         err = -ENOBUFS;
 542                         goto done;
 543                 }
 544                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 545                 for (i=0; i<newpsl->sl_count; ++i) {
 546                         struct sockaddr_in6 *psin6;
 547
 548                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 549                         newpsl->sl_addr[i] = psin6->sin6_addr;
 550                 }
 551                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 552                         newpsl->sl_count, newpsl->sl_addr, 0);
 553                 if (err) {
 554                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 555                         goto done;
 556                 }
 557         } else {
 558                 newpsl = NULL;
 559                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 560         }
 561
 562         write_lock_bh(&pmc->sflock);
 563         psl = pmc->sflist;
 564         if (psl) {
 565                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 566                         psl->sl_count, psl->sl_addr, 0);
 567                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 568         } else
 569                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 570         pmc->sflist = newpsl;
 571         pmc->sfmode = gsf->gf_fmode;
 572         write_unlock_bh(&pmc->sflock);
 573         err = 0;
 574 done:
 575         read_unlock_bh(&ipv6_sk_mc_lock);
 576         read_unlock_bh(&idev->lock);
 577         in6_dev_put(idev);
 578         dev_put(dev);
 579         if (leavegroup)
 580                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 581         return err;
 582 }
 583
 584 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 585         struct group_filter __user *optval, int __user *optlen)
 586 {
 587         int err, i, count, copycount;
 588         struct in6_addr *group;
 589         struct ipv6_mc_socklist *pmc;
 590         struct inet6_dev *idev;
 591         struct net_device *dev;
 592         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 593         struct ip6_sf_socklist *psl;
 594
 595         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 596
 597         if (!ipv6_addr_is_multicast(group))
 598                 return -EINVAL;
 599
 600         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 601
 602         if (!idev)
 603                 return -ENODEV;
 604
 605         dev = idev->dev;
 606
 607         err = -EADDRNOTAVAIL;
 608         /*
 609          * changes to the ipv6_mc_list require the socket lock and
 610          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 611          * so reading the list is safe.
 612          */
 613
 614         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 615                 if (pmc->ifindex != gsf->gf_interface)
 616                         continue;
 617                 if (ipv6_addr_equal(group, &pmc->addr))
 618                         break;
 619         }
 620         if (!pmc)               /* must have a prior join */
 621                 goto done;
 622         gsf->gf_fmode = pmc->sfmode;
 623         psl = pmc->sflist;
 624         count = psl ? psl->sl_count : 0;
 625         read_unlock_bh(&idev->lock);
 626         in6_dev_put(idev);
 627         dev_put(dev);
 628
 629         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 630         gsf->gf_numsrc = count;
 631         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 632             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 633                 return -EFAULT;
 634         }
 635         /* changes to psl require the socket lock, a read lock on
 636          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 637          * have the socket lock, so reading here is safe.
 638          */
 639         for (i=0; i<copycount; i++) {
 640                 struct sockaddr_in6 *psin6;
 641                 struct sockaddr_storage ss;
 642
 643                 psin6 = (struct sockaddr_in6 *)&ss;
 644                 memset(&ss, 0, sizeof(ss));
 645                 psin6->sin6_family = AF_INET6;
 646                 psin6->sin6_addr = psl->sl_addr[i];
 647                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 648                         return -EFAULT;
 649         }
 650         return 0;
 651 done:
 652         read_unlock_bh(&idev->lock);
 653         in6_dev_put(idev);
 654         dev_put(dev);
 655         return err;
 656 }
 657
 658 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 659         struct in6_addr *src_addr)
 660 {
 661         struct ipv6_pinfo *np = inet6_sk(sk);
 662         struct ipv6_mc_socklist *mc;
 663         struct ip6_sf_socklist *psl;
 664         int rv = 1;
 665
 666         read_lock(&ipv6_sk_mc_lock);
 667         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 668                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 669                         break;
 670         }
 671         if (!mc) {
 672                 read_unlock(&ipv6_sk_mc_lock);
 673                 return 1;
 674         }
 675         read_lock(&mc->sflock);
 676         psl = mc->sflist;
 677         if (!psl) {
 678                 rv = mc->sfmode == MCAST_EXCLUDE;
 679         } else {
 680                 int i;
 681
 682                 for (i=0; i<psl->sl_count; i++) {
 683                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 684                                 break;
 685                 }
 686                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 687                         rv = 0;
 688                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 689                         rv = 0;
 690         }
 691         read_unlock(&mc->sflock);
 692         read_unlock(&ipv6_sk_mc_lock);
 693
 694         return rv;
 695 }
 696
 697 static void ma_put(struct ifmcaddr6 *mc)
 698 {
 699         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 700                 in6_dev_put(mc->idev);
 701                 kfree(mc);
 702         }
 703 }
 704
 705 static void igmp6_group_added(struct ifmcaddr6 *mc)
 706 {
 707         struct net_device *dev = mc->idev->dev;
 708         char buf[MAX_ADDR_LEN];
 709
 710         spin_lock_bh(&mc->mca_lock);
 711         if (!(mc->mca_flags&MAF_LOADED)) {
 712                 mc->mca_flags |= MAF_LOADED;
 713                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 714                         dev_mc_add(dev, buf, dev->addr_len, 0);
 715         }
 716         spin_unlock_bh(&mc->mca_lock);
 717
 718         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 719                 return;
 720
 721         if (MLD_V1_SEEN(mc->idev)) {
 722                 igmp6_join_group(mc);
 723                 return;
 724         }
 725         /* else v2 */
 726
 727         mc->mca_crcount = mc->idev->mc_qrv;
 728         mld_ifc_event(mc->idev);
 729 }
 730
 731 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 732 {
 733         struct net_device *dev = mc->idev->dev;
 734         char buf[MAX_ADDR_LEN];
 735
 736         spin_lock_bh(&mc->mca_lock);
 737         if (mc->mca_flags&MAF_LOADED) {
 738                 mc->mca_flags &= ~MAF_LOADED;
 739                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 740                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 741         }
 742
 743         if (mc->mca_flags & MAF_NOREPORT)
 744                 goto done;
 745         spin_unlock_bh(&mc->mca_lock);
 746
 747         if (!mc->idev->dead)
 748                 igmp6_leave_group(mc);
 749
 750         spin_lock_bh(&mc->mca_lock);
 751         if (del_timer(&mc->mca_timer))
 752                 atomic_dec(&mc->mca_refcnt);
 753 done:
 754         ip6_mc_clear_src(mc);
 755         spin_unlock_bh(&mc->mca_lock);
 756 }
 757
 758 /*
 759  * deleted ifmcaddr6 manipulation
 760  */
 761 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 762 {
 763         struct ifmcaddr6 *pmc;
 764
 765         /* this is an "ifmcaddr6" for convenience; only the fields below
 766          * are actually used. In particular, the refcnt and users are not
 767          * used for management of the delete list. Using the same structure
 768          * for deleted items allows change reports to use common code with
 769          * non-deleted or query-response MCA's.
 770          */
 771         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 772         if (!pmc)
 773                 return;
 774
 775         spin_lock_bh(&im->mca_lock);
 776         spin_lock_init(&pmc->mca_lock);
 777         pmc->idev = im->idev;
 778         in6_dev_hold(idev);
 779         pmc->mca_addr = im->mca_addr;
 780         pmc->mca_crcount = idev->mc_qrv;
 781         pmc->mca_sfmode = im->mca_sfmode;
 782         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 783                 struct ip6_sf_list *psf;
 784
 785                 pmc->mca_tomb = im->mca_tomb;
 786                 pmc->mca_sources = im->mca_sources;
 787                 im->mca_tomb = im->mca_sources = NULL;
 788                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 789                         psf->sf_crcount = pmc->mca_crcount;
 790         }
 791         spin_unlock_bh(&im->mca_lock);
 792
 793         write_lock_bh(&idev->mc_lock);
 794         pmc->next = idev->mc_tomb;
 795         idev->mc_tomb = pmc;
 796         write_unlock_bh(&idev->mc_lock);
 797 }
 798
 799 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 800 {
 801         struct ifmcaddr6 *pmc, *pmc_prev;
 802         struct ip6_sf_list *psf, *psf_next;
 803
 804         write_lock_bh(&idev->mc_lock);
 805         pmc_prev = NULL;
 806         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 807                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 808                         break;
 809                 pmc_prev = pmc;
 810         }
 811         if (pmc) {
 812                 if (pmc_prev)
 813                         pmc_prev->next = pmc->next;
 814                 else
 815                         idev->mc_tomb = pmc->next;
 816         }
 817         write_unlock_bh(&idev->mc_lock);
 818         if (pmc) {
 819                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 820                         psf_next = psf->sf_next;
 821                         kfree(psf);
 822                 }
 823                 in6_dev_put(pmc->idev);
 824                 kfree(pmc);
 825         }
 826 }
 827
 828 static void mld_clear_delrec(struct inet6_dev *idev)
 829 {
 830         struct ifmcaddr6 *pmc, *nextpmc;
 831
 832         write_lock_bh(&idev->mc_lock);
 833         pmc = idev->mc_tomb;
 834         idev->mc_tomb = NULL;
 835         write_unlock_bh(&idev->mc_lock);
 836
 837         for (; pmc; pmc = nextpmc) {
 838                 nextpmc = pmc->next;
 839                 ip6_mc_clear_src(pmc);
 840                 in6_dev_put(pmc->idev);
 841                 kfree(pmc);
 842         }
 843
 844         /* clear dead sources, too */
 845         read_lock_bh(&idev->lock);
 846         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 847                 struct ip6_sf_list *psf, *psf_next;
 848
 849                 spin_lock_bh(&pmc->mca_lock);
 850                 psf = pmc->mca_tomb;
 851                 pmc->mca_tomb = NULL;
 852                 spin_unlock_bh(&pmc->mca_lock);
 853                 for (; psf; psf=psf_next) {
 854                         psf_next = psf->sf_next;
 855                         kfree(psf);
 856                 }
 857         }
 858         read_unlock_bh(&idev->lock);
 859 }
 860
 861
 862 /*
 863  *      device multicast group inc (add if not found)
 864  */
 865 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 866 {
 867         struct ifmcaddr6 *mc;
 868         struct inet6_dev *idev;
 869
 870         idev = in6_dev_get(dev);
 871
 872         if (idev == NULL)
 873                 return -EINVAL;
 874
 875         write_lock_bh(&idev->lock);
 876         if (idev->dead) {
 877                 write_unlock_bh(&idev->lock);
 878                 in6_dev_put(idev);
 879                 return -ENODEV;
 880         }
 881
 882         for (mc = idev->mc_list; mc; mc = mc->next) {
 883                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 884                         mc->mca_users++;
 885                         write_unlock_bh(&idev->lock);
 886                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 887                                 NULL, 0);
 888                         in6_dev_put(idev);
 889                         return 0;
 890                 }
 891         }
 892
 893         /*
 894          *      not found: create a new one.
 895          */
 896
 897         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 898
 899         if (mc == NULL) {
 900                 write_unlock_bh(&idev->lock);
 901                 in6_dev_put(idev);
 902                 return -ENOMEM;
 903         }
 904
 905         init_timer(&mc->mca_timer);
 906         mc->mca_timer.function = igmp6_timer_handler;
 907         mc->mca_timer.data = (unsigned long) mc;
 908
 909         ipv6_addr_copy(&mc->mca_addr, addr);
 910         mc->idev = idev;
 911         mc->mca_users = 1;
 912         /* mca_stamp should be updated upon changes */
 913         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 914         atomic_set(&mc->mca_refcnt, 2);
 915         spin_lock_init(&mc->mca_lock);
 916
 917         /* initial mode is (EX, empty) */
 918         mc->mca_sfmode = MCAST_EXCLUDE;
 919         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 920
 921         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 922             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 923                 mc->mca_flags |= MAF_NOREPORT;
 924
 925         mc->next = idev->mc_list;
 926         idev->mc_list = mc;
 927         write_unlock_bh(&idev->lock);
 928
 929         mld_del_delrec(idev, &mc->mca_addr);
 930         igmp6_group_added(mc);
 931         ma_put(mc);
 932         return 0;
 933 }
 934
 935 /*
 936  *      device multicast group del
 937  */
 938 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
 939 {
 940         struct ifmcaddr6 *ma, **map;
 941
 942         write_lock_bh(&idev->lock);
 943         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 944                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 945                         if (--ma->mca_users == 0) {
 946                                 *map = ma->next;
 947                                 write_unlock_bh(&idev->lock);
 948
 949                                 igmp6_group_dropped(ma);
 950
 951                                 ma_put(ma);
 952                                 return 0;
 953                         }
 954                         write_unlock_bh(&idev->lock);
 955                         return 0;
 956                 }
 957         }
 958         write_unlock_bh(&idev->lock);
 959
 960         return -ENOENT;
 961 }
 962
 963 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
 964 {
 965         struct inet6_dev *idev = in6_dev_get(dev);
 966         int err;
 967
 968         if (!idev)
 969                 return -ENODEV;
 970
 971         err = __ipv6_dev_mc_dec(idev, addr);
 972
 973         in6_dev_put(idev);
 974
 975         return err;
 976 }
 977
 978 /*
 979  * identify MLD packets for MLD filter exceptions
 980  */
 981 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 982 {
 983         struct icmp6hdr *pic;
 984
 985         if (nexthdr != IPPROTO_ICMPV6)
 986                 return 0;
 987
 988         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 989                 return 0;
 990
 991         pic = (struct icmp6hdr *)skb->h.raw;
 992
 993         switch (pic->icmp6_type) {
 994         case ICMPV6_MGM_QUERY:
 995         case ICMPV6_MGM_REPORT:
 996         case ICMPV6_MGM_REDUCTION:
 997         case ICMPV6_MLD2_REPORT:
 998                 return 1;
 999         default:
1000                 break;
1001         }
1002         return 0;
1003 }
1004
1005 /*
1006  *      check if the interface/address pair is valid
1007  */
1008 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1009         struct in6_addr *src_addr)
1010 {
1011         struct inet6_dev *idev;
1012         struct ifmcaddr6 *mc;
1013         int rv = 0;
1014
1015         idev = in6_dev_get(dev);
1016         if (idev) {
1017                 read_lock_bh(&idev->lock);
1018                 for (mc = idev->mc_list; mc; mc=mc->next) {
1019                         if (ipv6_addr_equal(&mc->mca_addr, group))
1020                                 break;
1021                 }
1022                 if (mc) {
1023                         if (src_addr && !ipv6_addr_any(src_addr)) {
1024                                 struct ip6_sf_list *psf;
1025
1026                                 spin_lock_bh(&mc->mca_lock);
1027                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1028                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1029                                                 break;
1030                                 }
1031                                 if (psf)
1032                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1033                                                 psf->sf_count[MCAST_EXCLUDE] !=
1034                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1035                                 else
1036                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1037                                 spin_unlock_bh(&mc->mca_lock);
1038                         } else
1039                                 rv = 1; /* don't filter unspecified source */
1040                 }
1041                 read_unlock_bh(&idev->lock);
1042                 in6_dev_put(idev);
1043         }
1044         return rv;
1045 }
1046
1047 static void mld_gq_start_timer(struct inet6_dev *idev)
1048 {
1049         int tv = net_random() % idev->mc_maxdelay;
1050
1051         idev->mc_gq_running = 1;
1052         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1053                 in6_dev_hold(idev);
1054 }
1055
1056 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1057 {
1058         int tv = net_random() % delay;
1059
1060         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1061                 in6_dev_hold(idev);
1062 }
1063
1064 /*
1065  *      IGMP handling (alias multicast ICMPv6 messages)
1066  */
1067
1068 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1069 {
1070         unsigned long delay = resptime;
1071
1072         /* Do not start timer for these addresses */
1073         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1074             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1075                 return;
1076
1077         if (del_timer(&ma->mca_timer)) {
1078                 atomic_dec(&ma->mca_refcnt);
1079                 delay = ma->mca_timer.expires - jiffies;
1080         }
1081
1082         if (delay >= resptime) {
1083                 if (resptime)
1084                         delay = net_random() % resptime;
1085                 else
1086                         delay = 1;
1087         }
1088         ma->mca_timer.expires = jiffies + delay;
1089         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1090                 atomic_inc(&ma->mca_refcnt);
1091         ma->mca_flags |= MAF_TIMER_RUNNING;
1092 }
1093
1094 /* mark EXCLUDE-mode sources */
1095 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1096         struct in6_addr *srcs)
1097 {
1098         struct ip6_sf_list *psf;
1099         int i, scount;
1100
1101         scount = 0;
1102         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1103                 if (scount == nsrcs)
1104                         break;
1105                 for (i=0; i<nsrcs; i++) {
1106                         /* skip inactive filters */
1107                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1108                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1109                             psf->sf_count[MCAST_EXCLUDE])
1110                                 continue;
1111                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1112                                 scount++;
1113                                 break;
1114                         }
1115                 }
1116         }
1117         pmc->mca_flags &= ~MAF_GSQUERY;
1118         if (scount == nsrcs)    /* all sources excluded */
1119                 return 0;
1120         return 1;
1121 }
1122
1123 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1124         struct in6_addr *srcs)
1125 {
1126         struct ip6_sf_list *psf;
1127         int i, scount;
1128
1129         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1130                 return mld_xmarksources(pmc, nsrcs, srcs);
1131
1132         /* mark INCLUDE-mode sources */
1133
1134         scount = 0;
1135         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1136                 if (scount == nsrcs)
1137                         break;
1138                 for (i=0; i<nsrcs; i++) {
1139                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1140                                 psf->sf_gsresp = 1;
1141                                 scount++;
1142                                 break;
1143                         }
1144                 }
1145         }
1146         if (!scount) {
1147                 pmc->mca_flags &= ~MAF_GSQUERY;
1148                 return 0;
1149         }
1150         pmc->mca_flags |= MAF_GSQUERY;
1151         return 1;
1152 }
1153
1154 int igmp6_event_query(struct sk_buff *skb)
1155 {
1156         struct mld2_query *mlh2 = NULL;
1157         struct ifmcaddr6 *ma;
1158         struct in6_addr *group;
1159         unsigned long max_delay;
1160         struct inet6_dev *idev;
1161         struct icmp6hdr *hdr;
1162         int group_type;
1163         int mark = 0;
1164         int len;
1165
1166         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1167                 return -EINVAL;
1168
1169         /* compute payload length excluding extension headers */
1170         len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1171         len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1172
1173         /* Drop queries with not link local source */
1174         if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1175                 return -EINVAL;
1176
1177         idev = in6_dev_get(skb->dev);
1178
1179         if (idev == NULL)
1180                 return 0;
1181
1182         hdr = (struct icmp6hdr *) skb->h.raw;
1183         group = (struct in6_addr *) (hdr + 1);
1184         group_type = ipv6_addr_type(group);
1185
1186         if (group_type != IPV6_ADDR_ANY &&
1187             !(group_type&IPV6_ADDR_MULTICAST)) {
1188                 in6_dev_put(idev);
1189                 return -EINVAL;
1190         }
1191
1192         if (len == 24) {
1193                 int switchback;
1194                 /* MLDv1 router present */
1195
1196                 /* Translate milliseconds to jiffies */
1197                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1198
1199                 switchback = (idev->mc_qrv + 1) * max_delay;
1200                 idev->mc_v1_seen = jiffies + switchback;
1201
1202                 /* cancel the interface change timer */
1203                 idev->mc_ifc_count = 0;
1204                 if (del_timer(&idev->mc_ifc_timer))
1205                         __in6_dev_put(idev);
1206                 /* clear deleted report items */
1207                 mld_clear_delrec(idev);
1208         } else if (len >= 28) {
1209                 int srcs_offset = sizeof(struct mld2_query) -
1210                                   sizeof(struct icmp6hdr);
1211                 if (!pskb_may_pull(skb, srcs_offset)) {
1212                         in6_dev_put(idev);
1213                         return -EINVAL;
1214                 }
1215                 mlh2 = (struct mld2_query *) skb->h.raw;
1216                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1217                 if (!max_delay)
1218                         max_delay = 1;
1219                 idev->mc_maxdelay = max_delay;
1220                 if (mlh2->qrv)
1221                         idev->mc_qrv = mlh2->qrv;
1222                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1223                         if (mlh2->nsrcs) {
1224                                 in6_dev_put(idev);
1225                                 return -EINVAL; /* no sources allowed */
1226                         }
1227                         mld_gq_start_timer(idev);
1228                         in6_dev_put(idev);
1229                         return 0;
1230                 }
1231                 /* mark sources to include, if group & source-specific */
1232                 if (mlh2->nsrcs != 0) {
1233                         if (!pskb_may_pull(skb, srcs_offset +
1234                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1235                                 in6_dev_put(idev);
1236                                 return -EINVAL;
1237                         }
1238                         mlh2 = (struct mld2_query *) skb->h.raw;
1239                         mark = 1;
1240                 }
1241         } else {
1242                 in6_dev_put(idev);
1243                 return -EINVAL;
1244         }
1245
1246         read_lock_bh(&idev->lock);
1247         if (group_type == IPV6_ADDR_ANY) {
1248                 for (ma = idev->mc_list; ma; ma=ma->next) {
1249                         spin_lock_bh(&ma->mca_lock);
1250                         igmp6_group_queried(ma, max_delay);
1251                         spin_unlock_bh(&ma->mca_lock);
1252                 }
1253         } else {
1254                 for (ma = idev->mc_list; ma; ma=ma->next) {
1255                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1256                                 continue;
1257                         spin_lock_bh(&ma->mca_lock);
1258                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1259                                 /* gsquery <- gsquery && mark */
1260                                 if (!mark)
1261                                         ma->mca_flags &= ~MAF_GSQUERY;
1262                         } else {
1263                                 /* gsquery <- mark */
1264                                 if (mark)
1265                                         ma->mca_flags |= MAF_GSQUERY;
1266                                 else
1267                                         ma->mca_flags &= ~MAF_GSQUERY;
1268                         }
1269                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1270                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1271                                 igmp6_group_queried(ma, max_delay);
1272                         spin_unlock_bh(&ma->mca_lock);
1273                         break;
1274                 }
1275         }
1276         read_unlock_bh(&idev->lock);
1277         in6_dev_put(idev);
1278
1279         return 0;
1280 }
1281
1282
1283 int igmp6_event_report(struct sk_buff *skb)
1284 {
1285         struct ifmcaddr6 *ma;
1286         struct in6_addr *addrp;
1287         struct inet6_dev *idev;
1288         struct icmp6hdr *hdr;
1289         int addr_type;
1290
1291         /* Our own report looped back. Ignore it. */
1292         if (skb->pkt_type == PACKET_LOOPBACK)
1293                 return 0;
1294
1295         /* send our report if the MC router may not have heard this report */
1296         if (skb->pkt_type != PACKET_MULTICAST &&
1297             skb->pkt_type != PACKET_BROADCAST)
1298                 return 0;
1299
1300         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1301                 return -EINVAL;
1302
1303         hdr = (struct icmp6hdr*) skb->h.raw;
1304
1305         /* Drop reports with not link local source */
1306         addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1307         if (addr_type != IPV6_ADDR_ANY &&
1308             !(addr_type&IPV6_ADDR_LINKLOCAL))
1309                 return -EINVAL;
1310
1311         addrp = (struct in6_addr *) (hdr + 1);
1312
1313         idev = in6_dev_get(skb->dev);
1314         if (idev == NULL)
1315                 return -ENODEV;
1316
1317         /*
1318          *      Cancel the timer for this group
1319          */
1320
1321         read_lock_bh(&idev->lock);
1322         for (ma = idev->mc_list; ma; ma=ma->next) {
1323                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1324                         spin_lock(&ma->mca_lock);
1325                         if (del_timer(&ma->mca_timer))
1326                                 atomic_dec(&ma->mca_refcnt);
1327                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1328                         spin_unlock(&ma->mca_lock);
1329                         break;
1330                 }
1331         }
1332         read_unlock_bh(&idev->lock);
1333         in6_dev_put(idev);
1334         return 0;
1335 }
1336
1337 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1338         int gdeleted, int sdeleted)
1339 {
1340         switch (type) {
1341         case MLD2_MODE_IS_INCLUDE:
1342         case MLD2_MODE_IS_EXCLUDE:
1343                 if (gdeleted || sdeleted)
1344                         return 0;
1345                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1346                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1347                                 return 1;
1348                         /* don't include if this source is excluded
1349                          * in all filters
1350                          */
1351                         if (psf->sf_count[MCAST_INCLUDE])
1352                                 return type == MLD2_MODE_IS_INCLUDE;
1353                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1354                                 psf->sf_count[MCAST_EXCLUDE];
1355                 }
1356                 return 0;
1357         case MLD2_CHANGE_TO_INCLUDE:
1358                 if (gdeleted || sdeleted)
1359                         return 0;
1360                 return psf->sf_count[MCAST_INCLUDE] != 0;
1361         case MLD2_CHANGE_TO_EXCLUDE:
1362                 if (gdeleted || sdeleted)
1363                         return 0;
1364                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1365                     psf->sf_count[MCAST_INCLUDE])
1366                         return 0;
1367                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1368                         psf->sf_count[MCAST_EXCLUDE];
1369         case MLD2_ALLOW_NEW_SOURCES:
1370                 if (gdeleted || !psf->sf_crcount)
1371                         return 0;
1372                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1373         case MLD2_BLOCK_OLD_SOURCES:
1374                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1375                         return gdeleted || (psf->sf_crcount && sdeleted);
1376                 return psf->sf_crcount && !gdeleted && !sdeleted;
1377         }
1378         return 0;
1379 }
1380
1381 static int
1382 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1383 {
1384         struct ip6_sf_list *psf;
1385         int scount = 0;
1386
1387         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1388                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1389                         continue;
1390                 scount++;
1391         }
1392         return scount;
1393 }
1394
1395 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1396 {
1397         struct sock *sk = igmp6_socket->sk;
1398         struct sk_buff *skb;
1399         struct mld2_report *pmr;
1400         struct in6_addr addr_buf;
1401         int err;
1402         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1403                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1404                      IPV6_TLV_PADN, 0 };
1405
1406         /* we assume size > sizeof(ra) here */
1407         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1408
1409         if (skb == 0)
1410                 return NULL;
1411
1412         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1413
1414         if (ipv6_get_lladdr(dev, &addr_buf)) {
1415                 /* <draft-ietf-magma-mld-source-05.txt>:
1416                  * use unspecified address as the source address
1417                  * when a valid link-local address is not available.
1418                  */
1419                 memset(&addr_buf, 0, sizeof(addr_buf));
1420         }
1421
1422         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1423
1424         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1425
1426         pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1427         skb->h.raw = (unsigned char *)pmr;
1428         pmr->type = ICMPV6_MLD2_REPORT;
1429         pmr->resv1 = 0;
1430         pmr->csum = 0;
1431         pmr->resv2 = 0;
1432         pmr->ngrec = 0;
1433         return skb;
1434 }
1435
1436 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1437 {
1438         struct net_device *dev = skb->dev;
1439
1440         if (dev->hard_header) {
1441                 unsigned char ha[MAX_ADDR_LEN];
1442                 int err;
1443
1444                 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1445                 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1446                 if (err < 0) {
1447                         kfree_skb(skb);
1448                         return err;
1449                 }
1450         }
1451         return dev_queue_xmit(skb);
1452 }
1453
1454 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1455 {
1456         return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1457                        mld_dev_queue_xmit2);
1458 }
1459
1460 static void mld_sendpack(struct sk_buff *skb)
1461 {
1462         struct ipv6hdr *pip6 = skb->nh.ipv6h;
1463         struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1464         int payload_len, mldlen;
1465         struct inet6_dev *idev = in6_dev_get(skb->dev);
1466         int err;
1467
1468         IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1469         payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1470                 sizeof(struct ipv6hdr);
1471         mldlen = skb->tail - skb->h.raw;
1472         pip6->payload_len = htons(payload_len);
1473
1474         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1475                 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1476         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1477                 mld_dev_queue_xmit);
1478         if (!err) {
1479                 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1480                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1481         } else
1482                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1483
1484         if (likely(idev != NULL))
1485                 in6_dev_put(idev);
1486 }
1487
1488 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1489 {
1490         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1491 }
1492
1493 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1494         int type, struct mld2_grec **ppgr)
1495 {
1496         struct net_device *dev = pmc->idev->dev;
1497         struct mld2_report *pmr;
1498         struct mld2_grec *pgr;
1499
1500         if (!skb)
1501                 skb = mld_newpack(dev, dev->mtu);
1502         if (!skb)
1503                 return NULL;
1504         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1505         pgr->grec_type = type;
1506         pgr->grec_auxwords = 0;
1507         pgr->grec_nsrcs = 0;
1508         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1509         pmr = (struct mld2_report *)skb->h.raw;
1510         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1511         *ppgr = pgr;
1512         return skb;
1513 }
1514
1515 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1516         skb_tailroom(skb)) : 0)
1517
1518 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1519         int type, int gdeleted, int sdeleted)
1520 {
1521         struct net_device *dev = pmc->idev->dev;
1522         struct mld2_report *pmr;
1523         struct mld2_grec *pgr = NULL;
1524         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1525         int scount, stotal, first, isquery, truncate;
1526
1527         if (pmc->mca_flags & MAF_NOREPORT)
1528                 return skb;
1529
1530         isquery = type == MLD2_MODE_IS_INCLUDE ||
1531                   type == MLD2_MODE_IS_EXCLUDE;
1532         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1533                     type == MLD2_CHANGE_TO_EXCLUDE;
1534
1535         stotal = scount = 0;
1536
1537         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1538
1539         if (!*psf_list)
1540                 goto empty_source;
1541
1542         pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1543
1544         /* EX and TO_EX get a fresh packet, if needed */
1545         if (truncate) {
1546                 if (pmr && pmr->ngrec &&
1547                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1548                         if (skb)
1549                                 mld_sendpack(skb);
1550                         skb = mld_newpack(dev, dev->mtu);
1551                 }
1552         }
1553         first = 1;
1554         psf_prev = NULL;
1555         for (psf=*psf_list; psf; psf=psf_next) {
1556                 struct in6_addr *psrc;
1557
1558                 psf_next = psf->sf_next;
1559
1560                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1561                         psf_prev = psf;
1562                         continue;
1563                 }
1564
1565                 /* clear marks on query responses */
1566                 if (isquery)
1567                         psf->sf_gsresp = 0;
1568
1569                 if (AVAILABLE(skb) < sizeof(*psrc) +
1570                     first*sizeof(struct mld2_grec)) {
1571                         if (truncate && !first)
1572                                 break;   /* truncate these */
1573                         if (pgr)
1574                                 pgr->grec_nsrcs = htons(scount);
1575                         if (skb)
1576                                 mld_sendpack(skb);
1577                         skb = mld_newpack(dev, dev->mtu);
1578                         first = 1;
1579                         scount = 0;
1580                 }
1581                 if (first) {
1582                         skb = add_grhead(skb, pmc, type, &pgr);
1583                         first = 0;
1584                 }
1585                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1586                 *psrc = psf->sf_addr;
1587                 scount++; stotal++;
1588                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1589                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1590                         psf->sf_crcount--;
1591                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1592                                 if (psf_prev)
1593                                         psf_prev->sf_next = psf->sf_next;
1594                                 else
1595                                         *psf_list = psf->sf_next;
1596                                 kfree(psf);
1597                                 continue;
1598                         }
1599                 }
1600                 psf_prev = psf;
1601         }
1602
1603 empty_source:
1604         if (!stotal) {
1605                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1606                     type == MLD2_BLOCK_OLD_SOURCES)
1607                         return skb;
1608                 if (pmc->mca_crcount || isquery) {
1609                         /* make sure we have room for group header */
1610                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1611                                 mld_sendpack(skb);
1612                                 skb = NULL; /* add_grhead will get a new one */
1613                         }
1614                         skb = add_grhead(skb, pmc, type, &pgr);
1615                 }
1616         }
1617         if (pgr)
1618                 pgr->grec_nsrcs = htons(scount);
1619
1620         if (isquery)
1621                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1622         return skb;
1623 }
1624
1625 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1626 {
1627         struct sk_buff *skb = NULL;
1628         int type;
1629
1630         if (!pmc) {
1631                 read_lock_bh(&idev->lock);
1632                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1633                         if (pmc->mca_flags & MAF_NOREPORT)
1634                                 continue;
1635                         spin_lock_bh(&pmc->mca_lock);
1636                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1637                                 type = MLD2_MODE_IS_EXCLUDE;
1638                         else
1639                                 type = MLD2_MODE_IS_INCLUDE;
1640                         skb = add_grec(skb, pmc, type, 0, 0);
1641                         spin_unlock_bh(&pmc->mca_lock);
1642                 }
1643                 read_unlock_bh(&idev->lock);
1644         } else {
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         if (skb)
1654                 mld_sendpack(skb);
1655 }
1656
1657 /*
1658  * remove zero-count source records from a source filter list
1659  */
1660 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1661 {
1662         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1663
1664         psf_prev = NULL;
1665         for (psf=*ppsf; psf; psf = psf_next) {
1666                 psf_next = psf->sf_next;
1667                 if (psf->sf_crcount == 0) {
1668                         if (psf_prev)
1669                                 psf_prev->sf_next = psf->sf_next;
1670                         else
1671                                 *ppsf = psf->sf_next;
1672                         kfree(psf);
1673                 } else
1674                         psf_prev = psf;
1675         }
1676 }
1677
1678 static void mld_send_cr(struct inet6_dev *idev)
1679 {
1680         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1681         struct sk_buff *skb = NULL;
1682         int type, dtype;
1683
1684         read_lock_bh(&idev->lock);
1685         write_lock_bh(&idev->mc_lock);
1686
1687         /* deleted MCA's */
1688         pmc_prev = NULL;
1689         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1690                 pmc_next = pmc->next;
1691                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1692                         type = MLD2_BLOCK_OLD_SOURCES;
1693                         dtype = MLD2_BLOCK_OLD_SOURCES;
1694                         skb = add_grec(skb, pmc, type, 1, 0);
1695                         skb = add_grec(skb, pmc, dtype, 1, 1);
1696                 }
1697                 if (pmc->mca_crcount) {
1698                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1699                                 type = MLD2_CHANGE_TO_INCLUDE;
1700                                 skb = add_grec(skb, pmc, type, 1, 0);
1701                         }
1702                         pmc->mca_crcount--;
1703                         if (pmc->mca_crcount == 0) {
1704                                 mld_clear_zeros(&pmc->mca_tomb);
1705                                 mld_clear_zeros(&pmc->mca_sources);
1706                         }
1707                 }
1708                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1709                     !pmc->mca_sources) {
1710                         if (pmc_prev)
1711                                 pmc_prev->next = pmc_next;
1712                         else
1713                                 idev->mc_tomb = pmc_next;
1714                         in6_dev_put(pmc->idev);
1715                         kfree(pmc);
1716                 } else
1717                         pmc_prev = pmc;
1718         }
1719         write_unlock_bh(&idev->mc_lock);
1720
1721         /* change recs */
1722         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1723                 spin_lock_bh(&pmc->mca_lock);
1724                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1725                         type = MLD2_BLOCK_OLD_SOURCES;
1726                         dtype = MLD2_ALLOW_NEW_SOURCES;
1727                 } else {
1728                         type = MLD2_ALLOW_NEW_SOURCES;
1729                         dtype = MLD2_BLOCK_OLD_SOURCES;
1730                 }
1731                 skb = add_grec(skb, pmc, type, 0, 0);
1732                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1733
1734                 /* filter mode changes */
1735                 if (pmc->mca_crcount) {
1736                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1737                                 type = MLD2_CHANGE_TO_EXCLUDE;
1738                         else
1739                                 type = MLD2_CHANGE_TO_INCLUDE;
1740                         skb = add_grec(skb, pmc, type, 0, 0);
1741                         pmc->mca_crcount--;
1742                 }
1743                 spin_unlock_bh(&pmc->mca_lock);
1744         }
1745         read_unlock_bh(&idev->lock);
1746         if (!skb)
1747                 return;
1748         (void) mld_sendpack(skb);
1749 }
1750
1751 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1752 {
1753         struct sock *sk = igmp6_socket->sk;
1754         struct inet6_dev *idev;
1755         struct sk_buff *skb;
1756         struct icmp6hdr *hdr;
1757         struct in6_addr *snd_addr;
1758         struct in6_addr *addrp;
1759         struct in6_addr addr_buf;
1760         struct in6_addr all_routers;
1761         int err, len, payload_len, full_len;
1762         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1763                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1764                      IPV6_TLV_PADN, 0 };
1765
1766         rcu_read_lock();
1767         IP6_INC_STATS(__in6_dev_get(dev),
1768                       IPSTATS_MIB_OUTREQUESTS);
1769         rcu_read_unlock();
1770         snd_addr = addr;
1771         if (type == ICMPV6_MGM_REDUCTION) {
1772                 snd_addr = &all_routers;
1773                 ipv6_addr_all_routers(&all_routers);
1774         }
1775
1776         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1777         payload_len = len + sizeof(ra);
1778         full_len = sizeof(struct ipv6hdr) + payload_len;
1779
1780         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1781
1782         if (skb == NULL) {
1783                 rcu_read_lock();
1784                 IP6_INC_STATS(__in6_dev_get(dev),
1785                               IPSTATS_MIB_OUTDISCARDS);
1786                 rcu_read_unlock();
1787                 return;
1788         }
1789
1790         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1791
1792         if (ipv6_get_lladdr(dev, &addr_buf)) {
1793                 /* <draft-ietf-magma-mld-source-05.txt>:
1794                  * use unspecified address as the source address
1795                  * when a valid link-local address is not available.
1796                  */
1797                 memset(&addr_buf, 0, sizeof(addr_buf));
1798         }
1799
1800         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1801
1802         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1803
1804         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1805         memset(hdr, 0, sizeof(struct icmp6hdr));
1806         hdr->icmp6_type = type;
1807
1808         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1809         ipv6_addr_copy(addrp, addr);
1810
1811         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1812                                            IPPROTO_ICMPV6,
1813                                            csum_partial((__u8 *) hdr, len, 0));
1814
1815         idev = in6_dev_get(skb->dev);
1816
1817         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1818                 mld_dev_queue_xmit);
1819         if (!err) {
1820                 if (type == ICMPV6_MGM_REDUCTION)
1821                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1822                 else
1823                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1824                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1825                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1826         } else
1827                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1828
1829         if (likely(idev != NULL))
1830                 in6_dev_put(idev);
1831         return;
1832 }
1833
1834 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1835         struct in6_addr *psfsrc)
1836 {
1837         struct ip6_sf_list *psf, *psf_prev;
1838         int rv = 0;
1839
1840         psf_prev = NULL;
1841         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1842                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1843                         break;
1844                 psf_prev = psf;
1845         }
1846         if (!psf || psf->sf_count[sfmode] == 0) {
1847                 /* source filter not found, or count wrong =>  bug */
1848                 return -ESRCH;
1849         }
1850         psf->sf_count[sfmode]--;
1851         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1852                 struct inet6_dev *idev = pmc->idev;
1853
1854                 /* no more filters for this source */
1855                 if (psf_prev)
1856                         psf_prev->sf_next = psf->sf_next;
1857                 else
1858                         pmc->mca_sources = psf->sf_next;
1859                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1860                     !MLD_V1_SEEN(idev)) {
1861                         psf->sf_crcount = idev->mc_qrv;
1862                         psf->sf_next = pmc->mca_tomb;
1863                         pmc->mca_tomb = psf;
1864                         rv = 1;
1865                 } else
1866                         kfree(psf);
1867         }
1868         return rv;
1869 }
1870
1871 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1872                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1873                           int delta)
1874 {
1875         struct ifmcaddr6 *pmc;
1876         int     changerec = 0;
1877         int     i, err;
1878
1879         if (!idev)
1880                 return -ENODEV;
1881         read_lock_bh(&idev->lock);
1882         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1883                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1884                         break;
1885         }
1886         if (!pmc) {
1887                 /* MCA not found?? bug */
1888                 read_unlock_bh(&idev->lock);
1889                 return -ESRCH;
1890         }
1891         spin_lock_bh(&pmc->mca_lock);
1892         sf_markstate(pmc);
1893         if (!delta) {
1894                 if (!pmc->mca_sfcount[sfmode]) {
1895                         spin_unlock_bh(&pmc->mca_lock);
1896                         read_unlock_bh(&idev->lock);
1897                         return -EINVAL;
1898                 }
1899                 pmc->mca_sfcount[sfmode]--;
1900         }
1901         err = 0;
1902         for (i=0; i<sfcount; i++) {
1903                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1904
1905                 changerec |= rv > 0;
1906                 if (!err && rv < 0)
1907                         err = rv;
1908         }
1909         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1910             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1911             pmc->mca_sfcount[MCAST_INCLUDE]) {
1912                 struct ip6_sf_list *psf;
1913
1914                 /* filter mode change */
1915                 pmc->mca_sfmode = MCAST_INCLUDE;
1916                 pmc->mca_crcount = idev->mc_qrv;
1917                 idev->mc_ifc_count = pmc->mca_crcount;
1918                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1919                         psf->sf_crcount = 0;
1920                 mld_ifc_event(pmc->idev);
1921         } else if (sf_setstate(pmc) || changerec)
1922                 mld_ifc_event(pmc->idev);
1923         spin_unlock_bh(&pmc->mca_lock);
1924         read_unlock_bh(&idev->lock);
1925         return err;
1926 }
1927
1928 /*
1929  * Add multicast single-source filter to the interface list
1930  */
1931 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1932         struct in6_addr *psfsrc, int delta)
1933 {
1934         struct ip6_sf_list *psf, *psf_prev;
1935
1936         psf_prev = NULL;
1937         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1938                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1939                         break;
1940                 psf_prev = psf;
1941         }
1942         if (!psf) {
1943                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1944                 if (!psf)
1945                         return -ENOBUFS;
1946
1947                 psf->sf_addr = *psfsrc;
1948                 if (psf_prev) {
1949                         psf_prev->sf_next = psf;
1950                 } else
1951                         pmc->mca_sources = psf;
1952         }
1953         psf->sf_count[sfmode]++;
1954         return 0;
1955 }
1956
1957 static void sf_markstate(struct ifmcaddr6 *pmc)
1958 {
1959         struct ip6_sf_list *psf;
1960         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1961
1962         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1963                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1964                         psf->sf_oldin = mca_xcount ==
1965                                 psf->sf_count[MCAST_EXCLUDE] &&
1966                                 !psf->sf_count[MCAST_INCLUDE];
1967                 } else
1968                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1969 }
1970
1971 static int sf_setstate(struct ifmcaddr6 *pmc)
1972 {
1973         struct ip6_sf_list *psf, *dpsf;
1974         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1975         int qrv = pmc->idev->mc_qrv;
1976         int new_in, rv;
1977
1978         rv = 0;
1979         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1980                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1981                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1982                                 !psf->sf_count[MCAST_INCLUDE];
1983                 } else
1984                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1985                 if (new_in) {
1986                         if (!psf->sf_oldin) {
1987                                 struct ip6_sf_list *prev = NULL;
1988
1989                                 for (dpsf=pmc->mca_tomb; dpsf;
1990                                      dpsf=dpsf->sf_next) {
1991                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1992                                             &psf->sf_addr))
1993                                                 break;
1994                                         prev = dpsf;
1995                                 }
1996                                 if (dpsf) {
1997                                         if (prev)
1998                                                 prev->sf_next = dpsf->sf_next;
1999                                         else
2000                                                 pmc->mca_tomb = dpsf->sf_next;
2001                                         kfree(dpsf);
2002                                 }
2003                                 psf->sf_crcount = qrv;
2004                                 rv++;
2005                         }
2006                 } else if (psf->sf_oldin) {
2007                         psf->sf_crcount = 0;
2008                         /*
2009                          * add or update "delete" records if an active filter
2010                          * is now inactive
2011                          */
2012                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2013                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2014                                     &psf->sf_addr))
2015                                         break;
2016                         if (!dpsf) {
2017                                 dpsf = (struct ip6_sf_list *)
2018                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2019                                 if (!dpsf)
2020                                         continue;
2021                                 *dpsf = *psf;
2022                                 /* pmc->mca_lock held by callers */
2023                                 dpsf->sf_next = pmc->mca_tomb;
2024                                 pmc->mca_tomb = dpsf;
2025                         }
2026                         dpsf->sf_crcount = qrv;
2027                         rv++;
2028                 }
2029         }
2030         return rv;
2031 }
2032
2033 /*
2034  * Add multicast source filter list to the interface list
2035  */
2036 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2037                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2038                           int delta)
2039 {
2040         struct ifmcaddr6 *pmc;
2041         int     isexclude;
2042         int     i, err;
2043
2044         if (!idev)
2045                 return -ENODEV;
2046         read_lock_bh(&idev->lock);
2047         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2048                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2049                         break;
2050         }
2051         if (!pmc) {
2052                 /* MCA not found?? bug */
2053                 read_unlock_bh(&idev->lock);
2054                 return -ESRCH;
2055         }
2056         spin_lock_bh(&pmc->mca_lock);
2057
2058         sf_markstate(pmc);
2059         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2060         if (!delta)
2061                 pmc->mca_sfcount[sfmode]++;
2062         err = 0;
2063         for (i=0; i<sfcount; i++) {
2064                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2065                 if (err)
2066                         break;
2067         }
2068         if (err) {
2069                 int j;
2070
2071                 if (!delta)
2072                         pmc->mca_sfcount[sfmode]--;
2073                 for (j=0; j<i; j++)
2074                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2075         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2076                 struct inet6_dev *idev = pmc->idev;
2077                 struct ip6_sf_list *psf;
2078
2079                 /* filter mode change */
2080                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2081                         pmc->mca_sfmode = MCAST_EXCLUDE;
2082                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2083                         pmc->mca_sfmode = MCAST_INCLUDE;
2084                 /* else no filters; keep old mode for reports */
2085
2086                 pmc->mca_crcount = idev->mc_qrv;
2087                 idev->mc_ifc_count = pmc->mca_crcount;
2088                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2089                         psf->sf_crcount = 0;
2090                 mld_ifc_event(idev);
2091         } else if (sf_setstate(pmc))
2092                 mld_ifc_event(idev);
2093         spin_unlock_bh(&pmc->mca_lock);
2094         read_unlock_bh(&idev->lock);
2095         return err;
2096 }
2097
2098 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2099 {
2100         struct ip6_sf_list *psf, *nextpsf;
2101
2102         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2103                 nextpsf = psf->sf_next;
2104                 kfree(psf);
2105         }
2106         pmc->mca_tomb = NULL;
2107         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2108                 nextpsf = psf->sf_next;
2109                 kfree(psf);
2110         }
2111         pmc->mca_sources = NULL;
2112         pmc->mca_sfmode = MCAST_EXCLUDE;
2113         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2114         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2115 }
2116
2117
2118 static void igmp6_join_group(struct ifmcaddr6 *ma)
2119 {
2120         unsigned long delay;
2121
2122         if (ma->mca_flags & MAF_NOREPORT)
2123                 return;
2124
2125         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2126
2127         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2128
2129         spin_lock_bh(&ma->mca_lock);
2130         if (del_timer(&ma->mca_timer)) {
2131                 atomic_dec(&ma->mca_refcnt);
2132                 delay = ma->mca_timer.expires - jiffies;
2133         }
2134
2135         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2136                 atomic_inc(&ma->mca_refcnt);
2137         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2138         spin_unlock_bh(&ma->mca_lock);
2139 }
2140
2141 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2142                             struct inet6_dev *idev)
2143 {
2144         int err;
2145
2146         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2147          * so no other readers or writers of iml or its sflist
2148          */
2149         if (iml->sflist == 0) {
2150                 /* any-source empty exclude case */
2151                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2152         }
2153         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2154                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2155         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2156         iml->sflist = NULL;
2157         return err;
2158 }
2159
2160 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2161 {
2162         if (MLD_V1_SEEN(ma->idev)) {
2163                 if (ma->mca_flags & MAF_LAST_REPORTER)
2164                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2165                                 ICMPV6_MGM_REDUCTION);
2166         } else {
2167                 mld_add_delrec(ma->idev, ma);
2168                 mld_ifc_event(ma->idev);
2169         }
2170 }
2171
2172 static void mld_gq_timer_expire(unsigned long data)
2173 {
2174         struct inet6_dev *idev = (struct inet6_dev *)data;
2175
2176         idev->mc_gq_running = 0;
2177         mld_send_report(idev, NULL);
2178         __in6_dev_put(idev);
2179 }
2180
2181 static void mld_ifc_timer_expire(unsigned long data)
2182 {
2183         struct inet6_dev *idev = (struct inet6_dev *)data;
2184
2185         mld_send_cr(idev);
2186         if (idev->mc_ifc_count) {
2187                 idev->mc_ifc_count--;
2188                 if (idev->mc_ifc_count)
2189                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2190         }
2191         __in6_dev_put(idev);
2192 }
2193
2194 static void mld_ifc_event(struct inet6_dev *idev)
2195 {
2196         if (MLD_V1_SEEN(idev))
2197                 return;
2198         idev->mc_ifc_count = idev->mc_qrv;
2199         mld_ifc_start_timer(idev, 1);
2200 }
2201
2202
2203 static void igmp6_timer_handler(unsigned long data)
2204 {
2205         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2206
2207         if (MLD_V1_SEEN(ma->idev))
2208                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2209         else
2210                 mld_send_report(ma->idev, ma);
2211
2212         spin_lock(&ma->mca_lock);
2213         ma->mca_flags |=  MAF_LAST_REPORTER;
2214         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2215         spin_unlock(&ma->mca_lock);
2216         ma_put(ma);
2217 }
2218
2219 /* Device going down */
2220
2221 void ipv6_mc_down(struct inet6_dev *idev)
2222 {
2223         struct ifmcaddr6 *i;
2224
2225         /* Withdraw multicast list */
2226
2227         read_lock_bh(&idev->lock);
2228         idev->mc_ifc_count = 0;
2229         if (del_timer(&idev->mc_ifc_timer))
2230                 __in6_dev_put(idev);
2231         idev->mc_gq_running = 0;
2232         if (del_timer(&idev->mc_gq_timer))
2233                 __in6_dev_put(idev);
2234
2235         for (i = idev->mc_list; i; i=i->next)
2236                 igmp6_group_dropped(i);
2237         read_unlock_bh(&idev->lock);
2238
2239         mld_clear_delrec(idev);
2240 }
2241
2242
2243 /* Device going up */
2244
2245 void ipv6_mc_up(struct inet6_dev *idev)
2246 {
2247         struct ifmcaddr6 *i;
2248
2249         /* Install multicast list, except for all-nodes (already installed) */
2250
2251         read_lock_bh(&idev->lock);
2252         for (i = idev->mc_list; i; i=i->next)
2253                 igmp6_group_added(i);
2254         read_unlock_bh(&idev->lock);
2255 }
2256
2257 /* IPv6 device initialization. */
2258
2259 void ipv6_mc_init_dev(struct inet6_dev *idev)
2260 {
2261         write_lock_bh(&idev->lock);
2262         rwlock_init(&idev->mc_lock);
2263         idev->mc_gq_running = 0;
2264         init_timer(&idev->mc_gq_timer);
2265         idev->mc_gq_timer.data = (unsigned long) idev;
2266         idev->mc_gq_timer.function = &mld_gq_timer_expire;
2267         idev->mc_tomb = NULL;
2268         idev->mc_ifc_count = 0;
2269         init_timer(&idev->mc_ifc_timer);
2270         idev->mc_ifc_timer.data = (unsigned long) idev;
2271         idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2272         idev->mc_qrv = MLD_QRV_DEFAULT;
2273         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2274         idev->mc_v1_seen = 0;
2275         write_unlock_bh(&idev->lock);
2276 }
2277
2278 /*
2279  *      Device is about to be destroyed: clean up.
2280  */
2281
2282 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2283 {
2284         struct ifmcaddr6 *i;
2285         struct in6_addr maddr;
2286
2287         /* Deactivate timers */
2288         ipv6_mc_down(idev);
2289
2290         /* Delete all-nodes address. */
2291         ipv6_addr_all_nodes(&maddr);
2292
2293         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2294          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2295          * fail.
2296          */
2297         __ipv6_dev_mc_dec(idev, &maddr);
2298
2299         if (idev->cnf.forwarding) {
2300                 ipv6_addr_all_routers(&maddr);
2301                 __ipv6_dev_mc_dec(idev, &maddr);
2302         }
2303
2304         write_lock_bh(&idev->lock);
2305         while ((i = idev->mc_list) != NULL) {
2306                 idev->mc_list = i->next;
2307                 write_unlock_bh(&idev->lock);
2308
2309                 igmp6_group_dropped(i);
2310                 ma_put(i);
2311
2312                 write_lock_bh(&idev->lock);
2313         }
2314         write_unlock_bh(&idev->lock);
2315 }
2316
2317 #ifdef CONFIG_PROC_FS
2318 struct igmp6_mc_iter_state {
2319         struct net_device *dev;
2320         struct inet6_dev *idev;
2321 };
2322
2323 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2324
2325 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2326 {
2327         struct ifmcaddr6 *im = NULL;
2328         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2329
2330         for (state->dev = dev_base, state->idev = NULL;
2331              state->dev;
2332              state->dev = state->dev->next) {
2333                 struct inet6_dev *idev;
2334                 idev = in6_dev_get(state->dev);
2335                 if (!idev)
2336                         continue;
2337                 read_lock_bh(&idev->lock);
2338                 im = idev->mc_list;
2339                 if (im) {
2340                         state->idev = idev;
2341                         break;
2342                 }
2343                 read_unlock_bh(&idev->lock);
2344                 in6_dev_put(idev);
2345         }
2346         return im;
2347 }
2348
2349 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2350 {
2351         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2352
2353         im = im->next;
2354         while (!im) {
2355                 if (likely(state->idev != NULL)) {
2356                         read_unlock_bh(&state->idev->lock);
2357                         in6_dev_put(state->idev);
2358                 }
2359                 state->dev = state->dev->next;
2360                 if (!state->dev) {
2361                         state->idev = NULL;
2362                         break;
2363                 }
2364                 state->idev = in6_dev_get(state->dev);
2365                 if (!state->idev)
2366                         continue;
2367                 read_lock_bh(&state->idev->lock);
2368                 im = state->idev->mc_list;
2369         }
2370         return im;
2371 }
2372
2373 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2374 {
2375         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2376         if (im)
2377                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2378                         --pos;
2379         return pos ? NULL : im;
2380 }
2381
2382 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2383 {
2384         read_lock(&dev_base_lock);
2385         return igmp6_mc_get_idx(seq, *pos);
2386 }
2387
2388 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2389 {
2390         struct ifmcaddr6 *im;
2391         im = igmp6_mc_get_next(seq, v);
2392         ++*pos;
2393         return im;
2394 }
2395
2396 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2397 {
2398         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2399         if (likely(state->idev != NULL)) {
2400                 read_unlock_bh(&state->idev->lock);
2401                 in6_dev_put(state->idev);
2402                 state->idev = NULL;
2403         }
2404         state->dev = NULL;
2405         read_unlock(&dev_base_lock);
2406 }
2407
2408 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2409 {
2410         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2411         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2412
2413         seq_printf(seq,
2414                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2415                    state->dev->ifindex, state->dev->name,
2416                    NIP6(im->mca_addr),
2417                    im->mca_users, im->mca_flags,
2418                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2419                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2420         return 0;
2421 }
2422
2423 static struct seq_operations igmp6_mc_seq_ops = {
2424         .start  =       igmp6_mc_seq_start,
2425         .next   =       igmp6_mc_seq_next,
2426         .stop   =       igmp6_mc_seq_stop,
2427         .show   =       igmp6_mc_seq_show,
2428 };
2429
2430 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2431 {
2432         struct seq_file *seq;
2433         int rc = -ENOMEM;
2434         struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2435
2436         if (!s)
2437                 goto out;
2438
2439         rc = seq_open(file, &igmp6_mc_seq_ops);
2440         if (rc)
2441                 goto out_kfree;
2442
2443         seq = file->private_data;
2444         seq->private = s;
2445 out:
2446         return rc;
2447 out_kfree:
2448         kfree(s);
2449         goto out;
2450 }
2451
2452 static struct file_operations igmp6_mc_seq_fops = {
2453         .owner          =       THIS_MODULE,
2454         .open           =       igmp6_mc_seq_open,
2455         .read           =       seq_read,
2456         .llseek         =       seq_lseek,
2457         .release        =       seq_release_private,
2458 };
2459
2460 struct igmp6_mcf_iter_state {
2461         struct net_device *dev;
2462         struct inet6_dev *idev;
2463         struct ifmcaddr6 *im;
2464 };
2465
2466 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2467
2468 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2469 {
2470         struct ip6_sf_list *psf = NULL;
2471         struct ifmcaddr6 *im = NULL;
2472         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2473
2474         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2475              state->dev;
2476              state->dev = state->dev->next) {
2477                 struct inet6_dev *idev;
2478                 idev = in6_dev_get(state->dev);
2479                 if (unlikely(idev == NULL))
2480                         continue;
2481                 read_lock_bh(&idev->lock);
2482                 im = idev->mc_list;
2483                 if (likely(im != NULL)) {
2484                         spin_lock_bh(&im->mca_lock);
2485                         psf = im->mca_sources;
2486                         if (likely(psf != NULL)) {
2487                                 state->im = im;
2488                                 state->idev = idev;
2489                                 break;
2490                         }
2491                         spin_unlock_bh(&im->mca_lock);
2492                 }
2493                 read_unlock_bh(&idev->lock);
2494                 in6_dev_put(idev);
2495         }
2496         return psf;
2497 }
2498
2499 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2500 {
2501         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2502
2503         psf = psf->sf_next;
2504         while (!psf) {
2505                 spin_unlock_bh(&state->im->mca_lock);
2506                 state->im = state->im->next;
2507                 while (!state->im) {
2508                         if (likely(state->idev != NULL)) {
2509                                 read_unlock_bh(&state->idev->lock);
2510                                 in6_dev_put(state->idev);
2511                         }
2512                         state->dev = state->dev->next;
2513                         if (!state->dev) {
2514                                 state->idev = NULL;
2515                                 goto out;
2516                         }
2517                         state->idev = in6_dev_get(state->dev);
2518                         if (!state->idev)
2519                                 continue;
2520                         read_lock_bh(&state->idev->lock);
2521                         state->im = state->idev->mc_list;
2522                 }
2523                 if (!state->im)
2524                         break;
2525                 spin_lock_bh(&state->im->mca_lock);
2526                 psf = state->im->mca_sources;
2527         }
2528 out:
2529         return psf;
2530 }
2531
2532 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2533 {
2534         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2535         if (psf)
2536                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2537                         --pos;
2538         return pos ? NULL : psf;
2539 }
2540
2541 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2542 {
2543         read_lock(&dev_base_lock);
2544         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2545 }
2546
2547 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2548 {
2549         struct ip6_sf_list *psf;
2550         if (v == SEQ_START_TOKEN)
2551                 psf = igmp6_mcf_get_first(seq);
2552         else
2553                 psf = igmp6_mcf_get_next(seq, v);
2554         ++*pos;
2555         return psf;
2556 }
2557
2558 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2559 {
2560         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2561         if (likely(state->im != NULL)) {
2562                 spin_unlock_bh(&state->im->mca_lock);
2563                 state->im = NULL;
2564         }
2565         if (likely(state->idev != NULL)) {
2566                 read_unlock_bh(&state->idev->lock);
2567                 in6_dev_put(state->idev);
2568                 state->idev = NULL;
2569         }
2570         state->dev = NULL;
2571         read_unlock(&dev_base_lock);
2572 }
2573
2574 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2575 {
2576         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2577         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2578
2579         if (v == SEQ_START_TOKEN) {
2580                 seq_printf(seq,
2581                            "%3s %6s "
2582                            "%32s %32s %6s %6s\n", "Idx",
2583                            "Device", "Multicast Address",
2584                            "Source Address", "INC", "EXC");
2585         } else {
2586                 seq_printf(seq,
2587                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2588                            state->dev->ifindex, state->dev->name,
2589                            NIP6(state->im->mca_addr),
2590                            NIP6(psf->sf_addr),
2591                            psf->sf_count[MCAST_INCLUDE],
2592                            psf->sf_count[MCAST_EXCLUDE]);
2593         }
2594         return 0;
2595 }
2596
2597 static struct seq_operations igmp6_mcf_seq_ops = {
2598         .start  =       igmp6_mcf_seq_start,
2599         .next   =       igmp6_mcf_seq_next,
2600         .stop   =       igmp6_mcf_seq_stop,
2601         .show   =       igmp6_mcf_seq_show,
2602 };
2603
2604 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2605 {
2606         struct seq_file *seq;
2607         int rc = -ENOMEM;
2608         struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2609
2610         if (!s)
2611                 goto out;
2612
2613         rc = seq_open(file, &igmp6_mcf_seq_ops);
2614         if (rc)
2615                 goto out_kfree;
2616
2617         seq = file->private_data;
2618         seq->private = s;
2619 out:
2620         return rc;
2621 out_kfree:
2622         kfree(s);
2623         goto out;
2624 }
2625
2626 static struct file_operations igmp6_mcf_seq_fops = {
2627         .owner          =       THIS_MODULE,
2628         .open           =       igmp6_mcf_seq_open,
2629         .read           =       seq_read,
2630         .llseek         =       seq_lseek,
2631         .release        =       seq_release_private,
2632 };
2633 #endif
2634
2635 int __init igmp6_init(struct net_proto_family *ops)
2636 {
2637         struct ipv6_pinfo *np;
2638         struct sock *sk;
2639         int err;
2640
2641         err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2642         if (err < 0) {
2643                 printk(KERN_ERR
2644                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2645                        err);
2646                 igmp6_socket = NULL; /* For safety. */
2647                 return err;
2648         }
2649
2650         sk = igmp6_socket->sk;
2651         sk->sk_allocation = GFP_ATOMIC;
2652         sk->sk_prot->unhash(sk);
2653
2654         np = inet6_sk(sk);
2655         np->hop_limit = 1;
2656
2657 #ifdef CONFIG_PROC_FS
2658         proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2659         proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2660 #endif
2661
2662         return 0;
2663 }
2664
2665 void igmp6_cleanup(void)
2666 {
2667         sock_release(igmp6_socket);
2668         igmp6_socket = NULL; /* for safety */
2669
2670 #ifdef CONFIG_PROC_FS
2671         proc_net_remove("mcfilter6");
2672         proc_net_remove("igmp6");
2673 #endif
2674 }