git.oblomov.eu Git - linux-2.6/blob - net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
   9  *
  10  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17
  18 /* Changes:
  19  *
  20  *      yoshfuji        : fix format of router-alert option
  21  *      YOSHIFUJI Hideaki @USAGI:
  22  *              Fixed source address for MLD message based on
  23  *              <draft-ietf-magma-mld-source-05.txt>.
  24  *      YOSHIFUJI Hideaki @USAGI:
  25  *              - Ignore Queries for invalid addresses.
  26  *              - MLD for link-local addresses.
  27  *      David L Stevens <dlstevens@us.ibm.com>:
  28  *              - MLDv2 support
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/errno.h>
  33 #include <linux/types.h>
  34 #include <linux/string.h>
  35 #include <linux/socket.h>
  36 #include <linux/sockios.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/times.h>
  39 #include <linux/net.h>
  40 #include <linux/in.h>
  41 #include <linux/in6.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/route.h>
  45 #include <linux/init.h>
  46 #include <linux/proc_fs.h>
  47 #include <linux/seq_file.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/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         __u16           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         __u16   csum;
  95         __u16   resv2;
  96         __u16   ngrec;
  97         struct mld2_grec grec[0];
  98 };
  99
 100 struct mld2_query {
 101         __u8 type;
 102         __u8 code;
 103         __u16 csum;
 104         __u16 mrc;
 105         __u16 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         __u16 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 = 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                                 if (idev) {
 272                                         (void) ip6_mc_leave_src(sk,mc_lst,idev);
 273                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 274                                         in6_dev_put(idev);
 275                                 }
 276                                 dev_put(dev);
 277                         }
 278                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 279                         return 0;
 280                 }
 281         }
 282         write_unlock_bh(&ipv6_sk_mc_lock);
 283
 284         return -EADDRNOTAVAIL;
 285 }
 286
 287 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
 288 {
 289         struct net_device *dev = NULL;
 290         struct inet6_dev *idev = NULL;
 291
 292         if (ifindex == 0) {
 293                 struct rt6_info *rt;
 294
 295                 rt = rt6_lookup(group, NULL, 0, 0);
 296                 if (rt) {
 297                         dev = rt->rt6i_dev;
 298                         dev_hold(dev);
 299                         dst_release(&rt->u.dst);
 300                 }
 301         } else
 302                 dev = dev_get_by_index(ifindex);
 303
 304         if (!dev)
 305                 return NULL;
 306         idev = in6_dev_get(dev);
 307         if (!idev) {
 308                 dev_put(dev);
 309                 return NULL;
 310         }
 311         read_lock_bh(&idev->lock);
 312         if (idev->dead) {
 313                 read_unlock_bh(&idev->lock);
 314                 in6_dev_put(idev);
 315                 dev_put(dev);
 316                 return NULL;
 317         }
 318         return idev;
 319 }
 320
 321 void ipv6_sock_mc_close(struct sock *sk)
 322 {
 323         struct ipv6_pinfo *np = inet6_sk(sk);
 324         struct ipv6_mc_socklist *mc_lst;
 325
 326         write_lock_bh(&ipv6_sk_mc_lock);
 327         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 328                 struct net_device *dev;
 329
 330                 np->ipv6_mc_list = mc_lst->next;
 331                 write_unlock_bh(&ipv6_sk_mc_lock);
 332
 333                 dev = dev_get_by_index(mc_lst->ifindex);
 334                 if (dev) {
 335                         struct inet6_dev *idev = in6_dev_get(dev);
 336
 337                         if (idev) {
 338                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 339                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 340                                 in6_dev_put(idev);
 341                         }
 342                         dev_put(dev);
 343                 }
 344
 345                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 346
 347                 write_lock_bh(&ipv6_sk_mc_lock);
 348         }
 349         write_unlock_bh(&ipv6_sk_mc_lock);
 350 }
 351
 352 int ip6_mc_source(int add, int omode, struct sock *sk,
 353         struct group_source_req *pgsr)
 354 {
 355         struct in6_addr *source, *group;
 356         struct ipv6_mc_socklist *pmc;
 357         struct net_device *dev;
 358         struct inet6_dev *idev;
 359         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 360         struct ip6_sf_socklist *psl;
 361         int i, j, rv;
 362         int leavegroup = 0;
 363         int pmclocked = 0;
 364         int err;
 365
 366         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 367             pgsr->gsr_source.ss_family != AF_INET6)
 368                 return -EINVAL;
 369
 370         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 371         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 372
 373         if (!ipv6_addr_is_multicast(group))
 374                 return -EINVAL;
 375
 376         idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
 377         if (!idev)
 378                 return -ENODEV;
 379         dev = idev->dev;
 380
 381         err = -EADDRNOTAVAIL;
 382
 383         read_lock_bh(&ipv6_sk_mc_lock);
 384         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 385                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 386                         continue;
 387                 if (ipv6_addr_equal(&pmc->addr, group))
 388                         break;
 389         }
 390         if (!pmc) {             /* must have a prior join */
 391                 err = -EINVAL;
 392                 goto done;
 393         }
 394         /* if a source filter was set, must be the same mode as before */
 395         if (pmc->sflist) {
 396                 if (pmc->sfmode != omode) {
 397                         err = -EINVAL;
 398                         goto done;
 399                 }
 400         } else if (pmc->sfmode != omode) {
 401                 /* allow mode switches for empty-set filters */
 402                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 403                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 404                 pmc->sfmode = omode;
 405         }
 406
 407         write_lock_bh(&pmc->sflock);
 408         pmclocked = 1;
 409
 410         psl = pmc->sflist;
 411         if (!add) {
 412                 if (!psl)
 413                         goto done;      /* err = -EADDRNOTAVAIL */
 414                 rv = !0;
 415                 for (i=0; i<psl->sl_count; i++) {
 416                         rv = memcmp(&psl->sl_addr[i], source,
 417                                 sizeof(struct in6_addr));
 418                         if (rv == 0)
 419                                 break;
 420                 }
 421                 if (rv)         /* source not found */
 422                         goto done;      /* err = -EADDRNOTAVAIL */
 423
 424                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 425                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 426                         leavegroup = 1;
 427                         goto done;
 428                 }
 429
 430                 /* update the interface filter */
 431                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 432
 433                 for (j=i+1; j<psl->sl_count; j++)
 434                         psl->sl_addr[j-1] = psl->sl_addr[j];
 435                 psl->sl_count--;
 436                 err = 0;
 437                 goto done;
 438         }
 439         /* else, add a new source to the filter */
 440
 441         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 442                 err = -ENOBUFS;
 443                 goto done;
 444         }
 445         if (!psl || psl->sl_count == psl->sl_max) {
 446                 struct ip6_sf_socklist *newpsl;
 447                 int count = IP6_SFBLOCK;
 448
 449                 if (psl)
 450                         count += psl->sl_max;
 451                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 452                 if (!newpsl) {
 453                         err = -ENOBUFS;
 454                         goto done;
 455                 }
 456                 newpsl->sl_max = count;
 457                 newpsl->sl_count = count - IP6_SFBLOCK;
 458                 if (psl) {
 459                         for (i=0; i<psl->sl_count; i++)
 460                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 461                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 462                 }
 463                 pmc->sflist = psl = newpsl;
 464         }
 465         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 466         for (i=0; i<psl->sl_count; i++) {
 467                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 468                 if (rv == 0)
 469                         break;
 470         }
 471         if (rv == 0)            /* address already there is an error */
 472                 goto done;
 473         for (j=psl->sl_count-1; j>=i; j--)
 474                 psl->sl_addr[j+1] = psl->sl_addr[j];
 475         psl->sl_addr[i] = *source;
 476         psl->sl_count++;
 477         err = 0;
 478         /* update the interface list */
 479         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 480 done:
 481         if (pmclocked)
 482                 write_unlock_bh(&pmc->sflock);
 483         read_unlock_bh(&ipv6_sk_mc_lock);
 484         read_unlock_bh(&idev->lock);
 485         in6_dev_put(idev);
 486         dev_put(dev);
 487         if (leavegroup)
 488                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 489         return err;
 490 }
 491
 492 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 493 {
 494         struct in6_addr *group;
 495         struct ipv6_mc_socklist *pmc;
 496         struct net_device *dev;
 497         struct inet6_dev *idev;
 498         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 499         struct ip6_sf_socklist *newpsl, *psl;
 500         int leavegroup = 0;
 501         int i, err;
 502
 503         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 504
 505         if (!ipv6_addr_is_multicast(group))
 506                 return -EINVAL;
 507         if (gsf->gf_fmode != MCAST_INCLUDE &&
 508             gsf->gf_fmode != MCAST_EXCLUDE)
 509                 return -EINVAL;
 510
 511         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 512
 513         if (!idev)
 514                 return -ENODEV;
 515         dev = idev->dev;
 516
 517         err = 0;
 518         read_lock_bh(&ipv6_sk_mc_lock);
 519
 520         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 521                 leavegroup = 1;
 522                 goto done;
 523         }
 524
 525         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 526                 if (pmc->ifindex != gsf->gf_interface)
 527                         continue;
 528                 if (ipv6_addr_equal(&pmc->addr, group))
 529                         break;
 530         }
 531         if (!pmc) {             /* must have a prior join */
 532                 err = -EINVAL;
 533                 goto done;
 534         }
 535         if (gsf->gf_numsrc) {
 536                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 537                                                           GFP_ATOMIC);
 538                 if (!newpsl) {
 539                         err = -ENOBUFS;
 540                         goto done;
 541                 }
 542                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 543                 for (i=0; i<newpsl->sl_count; ++i) {
 544                         struct sockaddr_in6 *psin6;
 545
 546                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 547                         newpsl->sl_addr[i] = psin6->sin6_addr;
 548                 }
 549                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 550                         newpsl->sl_count, newpsl->sl_addr, 0);
 551                 if (err) {
 552                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 553                         goto done;
 554                 }
 555         } else {
 556                 newpsl = NULL;
 557                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 558         }
 559
 560         write_lock_bh(&pmc->sflock);
 561         psl = pmc->sflist;
 562         if (psl) {
 563                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 564                         psl->sl_count, psl->sl_addr, 0);
 565                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 566         } else
 567                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 568         pmc->sflist = newpsl;
 569         pmc->sfmode = gsf->gf_fmode;
 570         write_unlock_bh(&pmc->sflock);
 571         err = 0;
 572 done:
 573         read_unlock_bh(&ipv6_sk_mc_lock);
 574         read_unlock_bh(&idev->lock);
 575         in6_dev_put(idev);
 576         dev_put(dev);
 577         if (leavegroup)
 578                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 579         return err;
 580 }
 581
 582 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 583         struct group_filter __user *optval, int __user *optlen)
 584 {
 585         int err, i, count, copycount;
 586         struct in6_addr *group;
 587         struct ipv6_mc_socklist *pmc;
 588         struct inet6_dev *idev;
 589         struct net_device *dev;
 590         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 591         struct ip6_sf_socklist *psl;
 592
 593         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 594
 595         if (!ipv6_addr_is_multicast(group))
 596                 return -EINVAL;
 597
 598         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 599
 600         if (!idev)
 601                 return -ENODEV;
 602
 603         dev = idev->dev;
 604
 605         err = -EADDRNOTAVAIL;
 606         /*
 607          * changes to the ipv6_mc_list require the socket lock and
 608          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 609          * so reading the list is safe.
 610          */
 611
 612         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 613                 if (pmc->ifindex != gsf->gf_interface)
 614                         continue;
 615                 if (ipv6_addr_equal(group, &pmc->addr))
 616                         break;
 617         }
 618         if (!pmc)               /* must have a prior join */
 619                 goto done;
 620         gsf->gf_fmode = pmc->sfmode;
 621         psl = pmc->sflist;
 622         count = psl ? psl->sl_count : 0;
 623         read_unlock_bh(&idev->lock);
 624         in6_dev_put(idev);
 625         dev_put(dev);
 626
 627         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 628         gsf->gf_numsrc = count;
 629         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 630             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 631                 return -EFAULT;
 632         }
 633         /* changes to psl require the socket lock, a read lock on
 634          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 635          * have the socket lock, so reading here is safe.
 636          */
 637         for (i=0; i<copycount; i++) {
 638                 struct sockaddr_in6 *psin6;
 639                 struct sockaddr_storage ss;
 640
 641                 psin6 = (struct sockaddr_in6 *)&ss;
 642                 memset(&ss, 0, sizeof(ss));
 643                 psin6->sin6_family = AF_INET6;
 644                 psin6->sin6_addr = psl->sl_addr[i];
 645                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 646                         return -EFAULT;
 647         }
 648         return 0;
 649 done:
 650         read_unlock_bh(&idev->lock);
 651         in6_dev_put(idev);
 652         dev_put(dev);
 653         return err;
 654 }
 655
 656 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 657         struct in6_addr *src_addr)
 658 {
 659         struct ipv6_pinfo *np = inet6_sk(sk);
 660         struct ipv6_mc_socklist *mc;
 661         struct ip6_sf_socklist *psl;
 662         int rv = 1;
 663
 664         read_lock(&ipv6_sk_mc_lock);
 665         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 666                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 667                         break;
 668         }
 669         if (!mc) {
 670                 read_unlock(&ipv6_sk_mc_lock);
 671                 return 1;
 672         }
 673         read_lock(&mc->sflock);
 674         psl = mc->sflist;
 675         if (!psl) {
 676                 rv = mc->sfmode == MCAST_EXCLUDE;
 677         } else {
 678                 int i;
 679
 680                 for (i=0; i<psl->sl_count; i++) {
 681                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 682                                 break;
 683                 }
 684                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 685                         rv = 0;
 686                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 687                         rv = 0;
 688         }
 689         read_unlock(&mc->sflock);
 690         read_unlock(&ipv6_sk_mc_lock);
 691
 692         return rv;
 693 }
 694
 695 static void ma_put(struct ifmcaddr6 *mc)
 696 {
 697         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 698                 in6_dev_put(mc->idev);
 699                 kfree(mc);
 700         }
 701 }
 702
 703 static void igmp6_group_added(struct ifmcaddr6 *mc)
 704 {
 705         struct net_device *dev = mc->idev->dev;
 706         char buf[MAX_ADDR_LEN];
 707
 708         spin_lock_bh(&mc->mca_lock);
 709         if (!(mc->mca_flags&MAF_LOADED)) {
 710                 mc->mca_flags |= MAF_LOADED;
 711                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 712                         dev_mc_add(dev, buf, dev->addr_len, 0);
 713         }
 714         spin_unlock_bh(&mc->mca_lock);
 715
 716         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 717                 return;
 718
 719         if (MLD_V1_SEEN(mc->idev)) {
 720                 igmp6_join_group(mc);
 721                 return;
 722         }
 723         /* else v2 */
 724
 725         mc->mca_crcount = mc->idev->mc_qrv;
 726         mld_ifc_event(mc->idev);
 727 }
 728
 729 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 730 {
 731         struct net_device *dev = mc->idev->dev;
 732         char buf[MAX_ADDR_LEN];
 733
 734         spin_lock_bh(&mc->mca_lock);
 735         if (mc->mca_flags&MAF_LOADED) {
 736                 mc->mca_flags &= ~MAF_LOADED;
 737                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 738                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 739         }
 740
 741         if (mc->mca_flags & MAF_NOREPORT)
 742                 goto done;
 743         spin_unlock_bh(&mc->mca_lock);
 744
 745         if (!mc->idev->dead)
 746                 igmp6_leave_group(mc);
 747
 748         spin_lock_bh(&mc->mca_lock);
 749         if (del_timer(&mc->mca_timer))
 750                 atomic_dec(&mc->mca_refcnt);
 751 done:
 752         ip6_mc_clear_src(mc);
 753         spin_unlock_bh(&mc->mca_lock);
 754 }
 755
 756 /*
 757  * deleted ifmcaddr6 manipulation
 758  */
 759 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 760 {
 761         struct ifmcaddr6 *pmc;
 762
 763         /* this is an "ifmcaddr6" for convenience; only the fields below
 764          * are actually used. In particular, the refcnt and users are not
 765          * used for management of the delete list. Using the same structure
 766          * for deleted items allows change reports to use common code with
 767          * non-deleted or query-response MCA's.
 768          */
 769         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 770         if (!pmc)
 771                 return;
 772
 773         spin_lock_bh(&im->mca_lock);
 774         spin_lock_init(&pmc->mca_lock);
 775         pmc->idev = im->idev;
 776         in6_dev_hold(idev);
 777         pmc->mca_addr = im->mca_addr;
 778         pmc->mca_crcount = idev->mc_qrv;
 779         pmc->mca_sfmode = im->mca_sfmode;
 780         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 781                 struct ip6_sf_list *psf;
 782
 783                 pmc->mca_tomb = im->mca_tomb;
 784                 pmc->mca_sources = im->mca_sources;
 785                 im->mca_tomb = im->mca_sources = NULL;
 786                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 787                         psf->sf_crcount = pmc->mca_crcount;
 788         }
 789         spin_unlock_bh(&im->mca_lock);
 790
 791         write_lock_bh(&idev->mc_lock);
 792         pmc->next = idev->mc_tomb;
 793         idev->mc_tomb = pmc;
 794         write_unlock_bh(&idev->mc_lock);
 795 }
 796
 797 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 798 {
 799         struct ifmcaddr6 *pmc, *pmc_prev;
 800         struct ip6_sf_list *psf, *psf_next;
 801
 802         write_lock_bh(&idev->mc_lock);
 803         pmc_prev = NULL;
 804         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 805                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 806                         break;
 807                 pmc_prev = pmc;
 808         }
 809         if (pmc) {
 810                 if (pmc_prev)
 811                         pmc_prev->next = pmc->next;
 812                 else
 813                         idev->mc_tomb = pmc->next;
 814         }
 815         write_unlock_bh(&idev->mc_lock);
 816         if (pmc) {
 817                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 818                         psf_next = psf->sf_next;
 819                         kfree(psf);
 820                 }
 821                 in6_dev_put(pmc->idev);
 822                 kfree(pmc);
 823         }
 824 }
 825
 826 static void mld_clear_delrec(struct inet6_dev *idev)
 827 {
 828         struct ifmcaddr6 *pmc, *nextpmc;
 829
 830         write_lock_bh(&idev->mc_lock);
 831         pmc = idev->mc_tomb;
 832         idev->mc_tomb = NULL;
 833         write_unlock_bh(&idev->mc_lock);
 834
 835         for (; pmc; pmc = nextpmc) {
 836                 nextpmc = pmc->next;
 837                 ip6_mc_clear_src(pmc);
 838                 in6_dev_put(pmc->idev);
 839                 kfree(pmc);
 840         }
 841
 842         /* clear dead sources, too */
 843         read_lock_bh(&idev->lock);
 844         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 845                 struct ip6_sf_list *psf, *psf_next;
 846
 847                 spin_lock_bh(&pmc->mca_lock);
 848                 psf = pmc->mca_tomb;
 849                 pmc->mca_tomb = NULL;
 850                 spin_unlock_bh(&pmc->mca_lock);
 851                 for (; psf; psf=psf_next) {
 852                         psf_next = psf->sf_next;
 853                         kfree(psf);
 854                 }
 855         }
 856         read_unlock_bh(&idev->lock);
 857 }
 858
 859
 860 /*
 861  *      device multicast group inc (add if not found)
 862  */
 863 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 864 {
 865         struct ifmcaddr6 *mc;
 866         struct inet6_dev *idev;
 867
 868         idev = in6_dev_get(dev);
 869
 870         if (idev == NULL)
 871                 return -EINVAL;
 872
 873         write_lock_bh(&idev->lock);
 874         if (idev->dead) {
 875                 write_unlock_bh(&idev->lock);
 876                 in6_dev_put(idev);
 877                 return -ENODEV;
 878         }
 879
 880         for (mc = idev->mc_list; mc; mc = mc->next) {
 881                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 882                         mc->mca_users++;
 883                         write_unlock_bh(&idev->lock);
 884                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 885                                 NULL, 0);
 886                         in6_dev_put(idev);
 887                         return 0;
 888                 }
 889         }
 890
 891         /*
 892          *      not found: create a new one.
 893          */
 894
 895         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 896
 897         if (mc == NULL) {
 898                 write_unlock_bh(&idev->lock);
 899                 in6_dev_put(idev);
 900                 return -ENOMEM;
 901         }
 902
 903         init_timer(&mc->mca_timer);
 904         mc->mca_timer.function = igmp6_timer_handler;
 905         mc->mca_timer.data = (unsigned long) mc;
 906
 907         ipv6_addr_copy(&mc->mca_addr, addr);
 908         mc->idev = idev;
 909         mc->mca_users = 1;
 910         /* mca_stamp should be updated upon changes */
 911         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 912         atomic_set(&mc->mca_refcnt, 2);
 913         spin_lock_init(&mc->mca_lock);
 914
 915         /* initial mode is (EX, empty) */
 916         mc->mca_sfmode = MCAST_EXCLUDE;
 917         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 918
 919         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 920             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 921                 mc->mca_flags |= MAF_NOREPORT;
 922
 923         mc->next = idev->mc_list;
 924         idev->mc_list = mc;
 925         write_unlock_bh(&idev->lock);
 926
 927         mld_del_delrec(idev, &mc->mca_addr);
 928         igmp6_group_added(mc);
 929         ma_put(mc);
 930         return 0;
 931 }
 932
 933 /*
 934  *      device multicast group del
 935  */
 936 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
 937 {
 938         struct ifmcaddr6 *ma, **map;
 939
 940         write_lock_bh(&idev->lock);
 941         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 942                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 943                         if (--ma->mca_users == 0) {
 944                                 *map = ma->next;
 945                                 write_unlock_bh(&idev->lock);
 946
 947                                 igmp6_group_dropped(ma);
 948
 949                                 ma_put(ma);
 950                                 return 0;
 951                         }
 952                         write_unlock_bh(&idev->lock);
 953                         return 0;
 954                 }
 955         }
 956         write_unlock_bh(&idev->lock);
 957
 958         return -ENOENT;
 959 }
 960
 961 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
 962 {
 963         struct inet6_dev *idev = in6_dev_get(dev);
 964         int err;
 965
 966         if (!idev)
 967                 return -ENODEV;
 968
 969         err = __ipv6_dev_mc_dec(idev, addr);
 970
 971         in6_dev_put(idev);
 972
 973         return err;
 974 }
 975
 976 /*
 977  * identify MLD packets for MLD filter exceptions
 978  */
 979 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 980 {
 981         struct icmp6hdr *pic;
 982
 983         if (nexthdr != IPPROTO_ICMPV6)
 984                 return 0;
 985
 986         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 987                 return 0;
 988
 989         pic = (struct icmp6hdr *)skb->h.raw;
 990
 991         switch (pic->icmp6_type) {
 992         case ICMPV6_MGM_QUERY:
 993         case ICMPV6_MGM_REPORT:
 994         case ICMPV6_MGM_REDUCTION:
 995         case ICMPV6_MLD2_REPORT:
 996                 return 1;
 997         default:
 998                 break;
 999         }
1000         return 0;
1001 }
1002
1003 /*
1004  *      check if the interface/address pair is valid
1005  */
1006 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1007         struct in6_addr *src_addr)
1008 {
1009         struct inet6_dev *idev;
1010         struct ifmcaddr6 *mc;
1011         int rv = 0;
1012
1013         idev = in6_dev_get(dev);
1014         if (idev) {
1015                 read_lock_bh(&idev->lock);
1016                 for (mc = idev->mc_list; mc; mc=mc->next) {
1017                         if (ipv6_addr_equal(&mc->mca_addr, group))
1018                                 break;
1019                 }
1020                 if (mc) {
1021                         if (src_addr && !ipv6_addr_any(src_addr)) {
1022                                 struct ip6_sf_list *psf;
1023
1024                                 spin_lock_bh(&mc->mca_lock);
1025                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1026                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1027                                                 break;
1028                                 }
1029                                 if (psf)
1030                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1031                                                 psf->sf_count[MCAST_EXCLUDE] !=
1032                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1033                                 else
1034                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1035                                 spin_unlock_bh(&mc->mca_lock);
1036                         } else
1037                                 rv = 1; /* don't filter unspecified source */
1038                 }
1039                 read_unlock_bh(&idev->lock);
1040                 in6_dev_put(idev);
1041         }
1042         return rv;
1043 }
1044
1045 static void mld_gq_start_timer(struct inet6_dev *idev)
1046 {
1047         int tv = net_random() % idev->mc_maxdelay;
1048
1049         idev->mc_gq_running = 1;
1050         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1051                 in6_dev_hold(idev);
1052 }
1053
1054 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1055 {
1056         int tv = net_random() % delay;
1057
1058         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1059                 in6_dev_hold(idev);
1060 }
1061
1062 /*
1063  *      IGMP handling (alias multicast ICMPv6 messages)
1064  */
1065
1066 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1067 {
1068         unsigned long delay = resptime;
1069
1070         /* Do not start timer for these addresses */
1071         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1072             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1073                 return;
1074
1075         if (del_timer(&ma->mca_timer)) {
1076                 atomic_dec(&ma->mca_refcnt);
1077                 delay = ma->mca_timer.expires - jiffies;
1078         }
1079
1080         if (delay >= resptime) {
1081                 if (resptime)
1082                         delay = net_random() % resptime;
1083                 else
1084                         delay = 1;
1085         }
1086         ma->mca_timer.expires = jiffies + delay;
1087         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1088                 atomic_inc(&ma->mca_refcnt);
1089         ma->mca_flags |= MAF_TIMER_RUNNING;
1090 }
1091
1092 /* mark EXCLUDE-mode sources */
1093 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1094         struct in6_addr *srcs)
1095 {
1096         struct ip6_sf_list *psf;
1097         int i, scount;
1098
1099         scount = 0;
1100         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1101                 if (scount == nsrcs)
1102                         break;
1103                 for (i=0; i<nsrcs; i++) {
1104                         /* skip inactive filters */
1105                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1106                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1107                             psf->sf_count[MCAST_EXCLUDE])
1108                                 continue;
1109                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1110                                 scount++;
1111                                 break;
1112                         }
1113                 }
1114         }
1115         pmc->mca_flags &= ~MAF_GSQUERY;
1116         if (scount == nsrcs)    /* all sources excluded */
1117                 return 0;
1118         return 1;
1119 }
1120
1121 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1122         struct in6_addr *srcs)
1123 {
1124         struct ip6_sf_list *psf;
1125         int i, scount;
1126
1127         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1128                 return mld_xmarksources(pmc, nsrcs, srcs);
1129
1130         /* mark INCLUDE-mode sources */
1131
1132         scount = 0;
1133         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1134                 if (scount == nsrcs)
1135                         break;
1136                 for (i=0; i<nsrcs; i++) {
1137                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1138                                 psf->sf_gsresp = 1;
1139                                 scount++;
1140                                 break;
1141                         }
1142                 }
1143         }
1144         if (!scount) {
1145                 pmc->mca_flags &= ~MAF_GSQUERY;
1146                 return 0;
1147         }
1148         pmc->mca_flags |= MAF_GSQUERY;
1149         return 1;
1150 }
1151
1152 int igmp6_event_query(struct sk_buff *skb)
1153 {
1154         struct mld2_query *mlh2 = NULL;
1155         struct ifmcaddr6 *ma;
1156         struct in6_addr *group;
1157         unsigned long max_delay;
1158         struct inet6_dev *idev;
1159         struct icmp6hdr *hdr;
1160         int group_type;
1161         int mark = 0;
1162         int len;
1163
1164         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1165                 return -EINVAL;
1166
1167         /* compute payload length excluding extension headers */
1168         len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1169         len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1170
1171         /* Drop queries with not link local source */
1172         if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1173                 return -EINVAL;
1174
1175         idev = in6_dev_get(skb->dev);
1176
1177         if (idev == NULL)
1178                 return 0;
1179
1180         hdr = (struct icmp6hdr *) skb->h.raw;
1181         group = (struct in6_addr *) (hdr + 1);
1182         group_type = ipv6_addr_type(group);
1183
1184         if (group_type != IPV6_ADDR_ANY &&
1185             !(group_type&IPV6_ADDR_MULTICAST)) {
1186                 in6_dev_put(idev);
1187                 return -EINVAL;
1188         }
1189
1190         if (len == 24) {
1191                 int switchback;
1192                 /* MLDv1 router present */
1193
1194                 /* Translate milliseconds to jiffies */
1195                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1196
1197                 switchback = (idev->mc_qrv + 1) * max_delay;
1198                 idev->mc_v1_seen = jiffies + switchback;
1199
1200                 /* cancel the interface change timer */
1201                 idev->mc_ifc_count = 0;
1202                 if (del_timer(&idev->mc_ifc_timer))
1203                         __in6_dev_put(idev);
1204                 /* clear deleted report items */
1205                 mld_clear_delrec(idev);
1206         } else if (len >= 28) {
1207                 int srcs_offset = sizeof(struct mld2_query) -
1208                                   sizeof(struct icmp6hdr);
1209                 if (!pskb_may_pull(skb, srcs_offset)) {
1210                         in6_dev_put(idev);
1211                         return -EINVAL;
1212                 }
1213                 mlh2 = (struct mld2_query *) skb->h.raw;
1214                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1215                 if (!max_delay)
1216                         max_delay = 1;
1217                 idev->mc_maxdelay = max_delay;
1218                 if (mlh2->qrv)
1219                         idev->mc_qrv = mlh2->qrv;
1220                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1221                         if (mlh2->nsrcs) {
1222                                 in6_dev_put(idev);
1223                                 return -EINVAL; /* no sources allowed */
1224                         }
1225                         mld_gq_start_timer(idev);
1226                         in6_dev_put(idev);
1227                         return 0;
1228                 }
1229                 /* mark sources to include, if group & source-specific */
1230                 if (mlh2->nsrcs != 0) {
1231                         if (!pskb_may_pull(skb, srcs_offset +
1232                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1233                                 in6_dev_put(idev);
1234                                 return -EINVAL;
1235                         }
1236                         mlh2 = (struct mld2_query *) skb->h.raw;
1237                         mark = 1;
1238                 }
1239         } else {
1240                 in6_dev_put(idev);
1241                 return -EINVAL;
1242         }
1243
1244         read_lock_bh(&idev->lock);
1245         if (group_type == IPV6_ADDR_ANY) {
1246                 for (ma = idev->mc_list; ma; ma=ma->next) {
1247                         spin_lock_bh(&ma->mca_lock);
1248                         igmp6_group_queried(ma, max_delay);
1249                         spin_unlock_bh(&ma->mca_lock);
1250                 }
1251         } else {
1252                 for (ma = idev->mc_list; ma; ma=ma->next) {
1253                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1254                                 continue;
1255                         spin_lock_bh(&ma->mca_lock);
1256                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1257                                 /* gsquery <- gsquery && mark */
1258                                 if (!mark)
1259                                         ma->mca_flags &= ~MAF_GSQUERY;
1260                         } else {
1261                                 /* gsquery <- mark */
1262                                 if (mark)
1263                                         ma->mca_flags |= MAF_GSQUERY;
1264                                 else
1265                                         ma->mca_flags &= ~MAF_GSQUERY;
1266                         }
1267                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1268                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1269                                 igmp6_group_queried(ma, max_delay);
1270                         spin_unlock_bh(&ma->mca_lock);
1271                         break;
1272                 }
1273         }
1274         read_unlock_bh(&idev->lock);
1275         in6_dev_put(idev);
1276
1277         return 0;
1278 }
1279
1280
1281 int igmp6_event_report(struct sk_buff *skb)
1282 {
1283         struct ifmcaddr6 *ma;
1284         struct in6_addr *addrp;
1285         struct inet6_dev *idev;
1286         struct icmp6hdr *hdr;
1287         int addr_type;
1288
1289         /* Our own report looped back. Ignore it. */
1290         if (skb->pkt_type == PACKET_LOOPBACK)
1291                 return 0;
1292
1293         /* send our report if the MC router may not have heard this report */
1294         if (skb->pkt_type != PACKET_MULTICAST &&
1295             skb->pkt_type != PACKET_BROADCAST)
1296                 return 0;
1297
1298         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1299                 return -EINVAL;
1300
1301         hdr = (struct icmp6hdr*) skb->h.raw;
1302
1303         /* Drop reports with not link local source */
1304         addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1305         if (addr_type != IPV6_ADDR_ANY &&
1306             !(addr_type&IPV6_ADDR_LINKLOCAL))
1307                 return -EINVAL;
1308
1309         addrp = (struct in6_addr *) (hdr + 1);
1310
1311         idev = in6_dev_get(skb->dev);
1312         if (idev == NULL)
1313                 return -ENODEV;
1314
1315         /*
1316          *      Cancel the timer for this group
1317          */
1318
1319         read_lock_bh(&idev->lock);
1320         for (ma = idev->mc_list; ma; ma=ma->next) {
1321                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1322                         spin_lock(&ma->mca_lock);
1323                         if (del_timer(&ma->mca_timer))
1324                                 atomic_dec(&ma->mca_refcnt);
1325                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1326                         spin_unlock(&ma->mca_lock);
1327                         break;
1328                 }
1329         }
1330         read_unlock_bh(&idev->lock);
1331         in6_dev_put(idev);
1332         return 0;
1333 }
1334
1335 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1336         int gdeleted, int sdeleted)
1337 {
1338         switch (type) {
1339         case MLD2_MODE_IS_INCLUDE:
1340         case MLD2_MODE_IS_EXCLUDE:
1341                 if (gdeleted || sdeleted)
1342                         return 0;
1343                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1344                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1345                                 return 1;
1346                         /* don't include if this source is excluded
1347                          * in all filters
1348                          */
1349                         if (psf->sf_count[MCAST_INCLUDE])
1350                                 return type == MLD2_MODE_IS_INCLUDE;
1351                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1352                                 psf->sf_count[MCAST_EXCLUDE];
1353                 }
1354                 return 0;
1355         case MLD2_CHANGE_TO_INCLUDE:
1356                 if (gdeleted || sdeleted)
1357                         return 0;
1358                 return psf->sf_count[MCAST_INCLUDE] != 0;
1359         case MLD2_CHANGE_TO_EXCLUDE:
1360                 if (gdeleted || sdeleted)
1361                         return 0;
1362                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1363                     psf->sf_count[MCAST_INCLUDE])
1364                         return 0;
1365                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1366                         psf->sf_count[MCAST_EXCLUDE];
1367         case MLD2_ALLOW_NEW_SOURCES:
1368                 if (gdeleted || !psf->sf_crcount)
1369                         return 0;
1370                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1371         case MLD2_BLOCK_OLD_SOURCES:
1372                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1373                         return gdeleted || (psf->sf_crcount && sdeleted);
1374                 return psf->sf_crcount && !gdeleted && !sdeleted;
1375         }
1376         return 0;
1377 }
1378
1379 static int
1380 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1381 {
1382         struct ip6_sf_list *psf;
1383         int scount = 0;
1384
1385         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1386                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1387                         continue;
1388                 scount++;
1389         }
1390         return scount;
1391 }
1392
1393 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1394 {
1395         struct sock *sk = igmp6_socket->sk;
1396         struct sk_buff *skb;
1397         struct mld2_report *pmr;
1398         struct in6_addr addr_buf;
1399         int err;
1400         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1401                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1402                      IPV6_TLV_PADN, 0 };
1403
1404         /* we assume size > sizeof(ra) here */
1405         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1406
1407         if (skb == 0)
1408                 return NULL;
1409
1410         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1411
1412         if (ipv6_get_lladdr(dev, &addr_buf)) {
1413                 /* <draft-ietf-magma-mld-source-05.txt>:
1414                  * use unspecified address as the source address
1415                  * when a valid link-local address is not available.
1416                  */
1417                 memset(&addr_buf, 0, sizeof(addr_buf));
1418         }
1419
1420         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1421
1422         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1423
1424         pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1425         skb->h.raw = (unsigned char *)pmr;
1426         pmr->type = ICMPV6_MLD2_REPORT;
1427         pmr->resv1 = 0;
1428         pmr->csum = 0;
1429         pmr->resv2 = 0;
1430         pmr->ngrec = 0;
1431         return skb;
1432 }
1433
1434 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1435 {
1436         struct net_device *dev = skb->dev;
1437
1438         if (dev->hard_header) {
1439                 unsigned char ha[MAX_ADDR_LEN];
1440                 int err;
1441
1442                 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1443                 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1444                 if (err < 0) {
1445                         kfree_skb(skb);
1446                         return err;
1447                 }
1448         }
1449         return dev_queue_xmit(skb);
1450 }
1451
1452 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1453 {
1454         return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1455                        mld_dev_queue_xmit2);
1456 }
1457
1458 static void mld_sendpack(struct sk_buff *skb)
1459 {
1460         struct ipv6hdr *pip6 = skb->nh.ipv6h;
1461         struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1462         int payload_len, mldlen;
1463         struct inet6_dev *idev = in6_dev_get(skb->dev);
1464         int err;
1465
1466         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1467         payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1468                 sizeof(struct ipv6hdr);
1469         mldlen = skb->tail - skb->h.raw;
1470         pip6->payload_len = htons(payload_len);
1471
1472         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1473                 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1474         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1475                 mld_dev_queue_xmit);
1476         if (!err) {
1477                 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1478                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1479         } else
1480                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1481
1482         if (likely(idev != NULL))
1483                 in6_dev_put(idev);
1484 }
1485
1486 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1487 {
1488         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1489 }
1490
1491 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1492         int type, struct mld2_grec **ppgr)
1493 {
1494         struct net_device *dev = pmc->idev->dev;
1495         struct mld2_report *pmr;
1496         struct mld2_grec *pgr;
1497
1498         if (!skb)
1499                 skb = mld_newpack(dev, dev->mtu);
1500         if (!skb)
1501                 return NULL;
1502         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1503         pgr->grec_type = type;
1504         pgr->grec_auxwords = 0;
1505         pgr->grec_nsrcs = 0;
1506         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1507         pmr = (struct mld2_report *)skb->h.raw;
1508         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1509         *ppgr = pgr;
1510         return skb;
1511 }
1512
1513 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1514         skb_tailroom(skb)) : 0)
1515
1516 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1517         int type, int gdeleted, int sdeleted)
1518 {
1519         struct net_device *dev = pmc->idev->dev;
1520         struct mld2_report *pmr;
1521         struct mld2_grec *pgr = NULL;
1522         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1523         int scount, stotal, first, isquery, truncate;
1524
1525         if (pmc->mca_flags & MAF_NOREPORT)
1526                 return skb;
1527
1528         isquery = type == MLD2_MODE_IS_INCLUDE ||
1529                   type == MLD2_MODE_IS_EXCLUDE;
1530         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1531                     type == MLD2_CHANGE_TO_EXCLUDE;
1532
1533         stotal = scount = 0;
1534
1535         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1536
1537         if (!*psf_list)
1538                 goto empty_source;
1539
1540         pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1541
1542         /* EX and TO_EX get a fresh packet, if needed */
1543         if (truncate) {
1544                 if (pmr && pmr->ngrec &&
1545                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1546                         if (skb)
1547                                 mld_sendpack(skb);
1548                         skb = mld_newpack(dev, dev->mtu);
1549                 }
1550         }
1551         first = 1;
1552         psf_prev = NULL;
1553         for (psf=*psf_list; psf; psf=psf_next) {
1554                 struct in6_addr *psrc;
1555
1556                 psf_next = psf->sf_next;
1557
1558                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1559                         psf_prev = psf;
1560                         continue;
1561                 }
1562
1563                 /* clear marks on query responses */
1564                 if (isquery)
1565                         psf->sf_gsresp = 0;
1566
1567                 if (AVAILABLE(skb) < sizeof(*psrc) +
1568                     first*sizeof(struct mld2_grec)) {
1569                         if (truncate && !first)
1570                                 break;   /* truncate these */
1571                         if (pgr)
1572                                 pgr->grec_nsrcs = htons(scount);
1573                         if (skb)
1574                                 mld_sendpack(skb);
1575                         skb = mld_newpack(dev, dev->mtu);
1576                         first = 1;
1577                         scount = 0;
1578                 }
1579                 if (first) {
1580                         skb = add_grhead(skb, pmc, type, &pgr);
1581                         first = 0;
1582                 }
1583                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1584                 *psrc = psf->sf_addr;
1585                 scount++; stotal++;
1586                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1587                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1588                         psf->sf_crcount--;
1589                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1590                                 if (psf_prev)
1591                                         psf_prev->sf_next = psf->sf_next;
1592                                 else
1593                                         *psf_list = psf->sf_next;
1594                                 kfree(psf);
1595                                 continue;
1596                         }
1597                 }
1598                 psf_prev = psf;
1599         }
1600
1601 empty_source:
1602         if (!stotal) {
1603                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1604                     type == MLD2_BLOCK_OLD_SOURCES)
1605                         return skb;
1606                 if (pmc->mca_crcount || isquery) {
1607                         /* make sure we have room for group header */
1608                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1609                                 mld_sendpack(skb);
1610                                 skb = NULL; /* add_grhead will get a new one */
1611                         }
1612                         skb = add_grhead(skb, pmc, type, &pgr);
1613                 }
1614         }
1615         if (pgr)
1616                 pgr->grec_nsrcs = htons(scount);
1617
1618         if (isquery)
1619                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1620         return skb;
1621 }
1622
1623 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1624 {
1625         struct sk_buff *skb = NULL;
1626         int type;
1627
1628         if (!pmc) {
1629                 read_lock_bh(&idev->lock);
1630                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1631                         if (pmc->mca_flags & MAF_NOREPORT)
1632                                 continue;
1633                         spin_lock_bh(&pmc->mca_lock);
1634                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1635                                 type = MLD2_MODE_IS_EXCLUDE;
1636                         else
1637                                 type = MLD2_MODE_IS_INCLUDE;
1638                         skb = add_grec(skb, pmc, type, 0, 0);
1639                         spin_unlock_bh(&pmc->mca_lock);
1640                 }
1641                 read_unlock_bh(&idev->lock);
1642         } else {
1643                 spin_lock_bh(&pmc->mca_lock);
1644                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1645                         type = MLD2_MODE_IS_EXCLUDE;
1646                 else
1647                         type = MLD2_MODE_IS_INCLUDE;
1648                 skb = add_grec(skb, pmc, type, 0, 0);
1649                 spin_unlock_bh(&pmc->mca_lock);
1650         }
1651         if (skb)
1652                 mld_sendpack(skb);
1653 }
1654
1655 /*
1656  * remove zero-count source records from a source filter list
1657  */
1658 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1659 {
1660         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1661
1662         psf_prev = NULL;
1663         for (psf=*ppsf; psf; psf = psf_next) {
1664                 psf_next = psf->sf_next;
1665                 if (psf->sf_crcount == 0) {
1666                         if (psf_prev)
1667                                 psf_prev->sf_next = psf->sf_next;
1668                         else
1669                                 *ppsf = psf->sf_next;
1670                         kfree(psf);
1671                 } else
1672                         psf_prev = psf;
1673         }
1674 }
1675
1676 static void mld_send_cr(struct inet6_dev *idev)
1677 {
1678         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1679         struct sk_buff *skb = NULL;
1680         int type, dtype;
1681
1682         read_lock_bh(&idev->lock);
1683         write_lock_bh(&idev->mc_lock);
1684
1685         /* deleted MCA's */
1686         pmc_prev = NULL;
1687         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1688                 pmc_next = pmc->next;
1689                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1690                         type = MLD2_BLOCK_OLD_SOURCES;
1691                         dtype = MLD2_BLOCK_OLD_SOURCES;
1692                         skb = add_grec(skb, pmc, type, 1, 0);
1693                         skb = add_grec(skb, pmc, dtype, 1, 1);
1694                 }
1695                 if (pmc->mca_crcount) {
1696                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1697                                 type = MLD2_CHANGE_TO_INCLUDE;
1698                                 skb = add_grec(skb, pmc, type, 1, 0);
1699                         }
1700                         pmc->mca_crcount--;
1701                         if (pmc->mca_crcount == 0) {
1702                                 mld_clear_zeros(&pmc->mca_tomb);
1703                                 mld_clear_zeros(&pmc->mca_sources);
1704                         }
1705                 }
1706                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1707                     !pmc->mca_sources) {
1708                         if (pmc_prev)
1709                                 pmc_prev->next = pmc_next;
1710                         else
1711                                 idev->mc_tomb = pmc_next;
1712                         in6_dev_put(pmc->idev);
1713                         kfree(pmc);
1714                 } else
1715                         pmc_prev = pmc;
1716         }
1717         write_unlock_bh(&idev->mc_lock);
1718
1719         /* change recs */
1720         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1721                 spin_lock_bh(&pmc->mca_lock);
1722                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1723                         type = MLD2_BLOCK_OLD_SOURCES;
1724                         dtype = MLD2_ALLOW_NEW_SOURCES;
1725                 } else {
1726                         type = MLD2_ALLOW_NEW_SOURCES;
1727                         dtype = MLD2_BLOCK_OLD_SOURCES;
1728                 }
1729                 skb = add_grec(skb, pmc, type, 0, 0);
1730                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1731
1732                 /* filter mode changes */
1733                 if (pmc->mca_crcount) {
1734                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1735                                 type = MLD2_CHANGE_TO_EXCLUDE;
1736                         else
1737                                 type = MLD2_CHANGE_TO_INCLUDE;
1738                         skb = add_grec(skb, pmc, type, 0, 0);
1739                         pmc->mca_crcount--;
1740                 }
1741                 spin_unlock_bh(&pmc->mca_lock);
1742         }
1743         read_unlock_bh(&idev->lock);
1744         if (!skb)
1745                 return;
1746         (void) mld_sendpack(skb);
1747 }
1748
1749 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1750 {
1751         struct sock *sk = igmp6_socket->sk;
1752         struct inet6_dev *idev;
1753         struct sk_buff *skb;
1754         struct icmp6hdr *hdr;
1755         struct in6_addr *snd_addr;
1756         struct in6_addr *addrp;
1757         struct in6_addr addr_buf;
1758         struct in6_addr all_routers;
1759         int err, len, payload_len, full_len;
1760         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1761                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1762                      IPV6_TLV_PADN, 0 };
1763
1764         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1765         snd_addr = addr;
1766         if (type == ICMPV6_MGM_REDUCTION) {
1767                 snd_addr = &all_routers;
1768                 ipv6_addr_all_routers(&all_routers);
1769         }
1770
1771         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1772         payload_len = len + sizeof(ra);
1773         full_len = sizeof(struct ipv6hdr) + payload_len;
1774
1775         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1776
1777         if (skb == NULL) {
1778                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1779                 return;
1780         }
1781
1782         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1783
1784         if (ipv6_get_lladdr(dev, &addr_buf)) {
1785                 /* <draft-ietf-magma-mld-source-05.txt>:
1786                  * use unspecified address as the source address
1787                  * when a valid link-local address is not available.
1788                  */
1789                 memset(&addr_buf, 0, sizeof(addr_buf));
1790         }
1791
1792         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1793
1794         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1795
1796         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1797         memset(hdr, 0, sizeof(struct icmp6hdr));
1798         hdr->icmp6_type = type;
1799
1800         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1801         ipv6_addr_copy(addrp, addr);
1802
1803         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1804                                            IPPROTO_ICMPV6,
1805                                            csum_partial((__u8 *) hdr, len, 0));
1806
1807         idev = in6_dev_get(skb->dev);
1808
1809         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1810                 mld_dev_queue_xmit);
1811         if (!err) {
1812                 if (type == ICMPV6_MGM_REDUCTION)
1813                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1814                 else
1815                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1816                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1817                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1818         } else
1819                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1820
1821         if (likely(idev != NULL))
1822                 in6_dev_put(idev);
1823         return;
1824 }
1825
1826 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1827         struct in6_addr *psfsrc)
1828 {
1829         struct ip6_sf_list *psf, *psf_prev;
1830         int rv = 0;
1831
1832         psf_prev = NULL;
1833         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1834                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1835                         break;
1836                 psf_prev = psf;
1837         }
1838         if (!psf || psf->sf_count[sfmode] == 0) {
1839                 /* source filter not found, or count wrong =>  bug */
1840                 return -ESRCH;
1841         }
1842         psf->sf_count[sfmode]--;
1843         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1844                 struct inet6_dev *idev = pmc->idev;
1845
1846                 /* no more filters for this source */
1847                 if (psf_prev)
1848                         psf_prev->sf_next = psf->sf_next;
1849                 else
1850                         pmc->mca_sources = psf->sf_next;
1851                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1852                     !MLD_V1_SEEN(idev)) {
1853                         psf->sf_crcount = idev->mc_qrv;
1854                         psf->sf_next = pmc->mca_tomb;
1855                         pmc->mca_tomb = psf;
1856                         rv = 1;
1857                 } else
1858                         kfree(psf);
1859         }
1860         return rv;
1861 }
1862
1863 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1864                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1865                           int delta)
1866 {
1867         struct ifmcaddr6 *pmc;
1868         int     changerec = 0;
1869         int     i, err;
1870
1871         if (!idev)
1872                 return -ENODEV;
1873         read_lock_bh(&idev->lock);
1874         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1875                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1876                         break;
1877         }
1878         if (!pmc) {
1879                 /* MCA not found?? bug */
1880                 read_unlock_bh(&idev->lock);
1881                 return -ESRCH;
1882         }
1883         spin_lock_bh(&pmc->mca_lock);
1884         sf_markstate(pmc);
1885         if (!delta) {
1886                 if (!pmc->mca_sfcount[sfmode]) {
1887                         spin_unlock_bh(&pmc->mca_lock);
1888                         read_unlock_bh(&idev->lock);
1889                         return -EINVAL;
1890                 }
1891                 pmc->mca_sfcount[sfmode]--;
1892         }
1893         err = 0;
1894         for (i=0; i<sfcount; i++) {
1895                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1896
1897                 changerec |= rv > 0;
1898                 if (!err && rv < 0)
1899                         err = rv;
1900         }
1901         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1902             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1903             pmc->mca_sfcount[MCAST_INCLUDE]) {
1904                 struct ip6_sf_list *psf;
1905
1906                 /* filter mode change */
1907                 pmc->mca_sfmode = MCAST_INCLUDE;
1908                 pmc->mca_crcount = idev->mc_qrv;
1909                 idev->mc_ifc_count = pmc->mca_crcount;
1910                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1911                         psf->sf_crcount = 0;
1912                 mld_ifc_event(pmc->idev);
1913         } else if (sf_setstate(pmc) || changerec)
1914                 mld_ifc_event(pmc->idev);
1915         spin_unlock_bh(&pmc->mca_lock);
1916         read_unlock_bh(&idev->lock);
1917         return err;
1918 }
1919
1920 /*
1921  * Add multicast single-source filter to the interface list
1922  */
1923 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1924         struct in6_addr *psfsrc, int delta)
1925 {
1926         struct ip6_sf_list *psf, *psf_prev;
1927
1928         psf_prev = NULL;
1929         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1930                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1931                         break;
1932                 psf_prev = psf;
1933         }
1934         if (!psf) {
1935                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1936                 if (!psf)
1937                         return -ENOBUFS;
1938
1939                 psf->sf_addr = *psfsrc;
1940                 if (psf_prev) {
1941                         psf_prev->sf_next = psf;
1942                 } else
1943                         pmc->mca_sources = psf;
1944         }
1945         psf->sf_count[sfmode]++;
1946         return 0;
1947 }
1948
1949 static void sf_markstate(struct ifmcaddr6 *pmc)
1950 {
1951         struct ip6_sf_list *psf;
1952         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1953
1954         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1955                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1956                         psf->sf_oldin = mca_xcount ==
1957                                 psf->sf_count[MCAST_EXCLUDE] &&
1958                                 !psf->sf_count[MCAST_INCLUDE];
1959                 } else
1960                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1961 }
1962
1963 static int sf_setstate(struct ifmcaddr6 *pmc)
1964 {
1965         struct ip6_sf_list *psf, *dpsf;
1966         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1967         int qrv = pmc->idev->mc_qrv;
1968         int new_in, rv;
1969
1970         rv = 0;
1971         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1972                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1973                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1974                                 !psf->sf_count[MCAST_INCLUDE];
1975                 } else
1976                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1977                 if (new_in) {
1978                         if (!psf->sf_oldin) {
1979                                 struct ip6_sf_list *prev = NULL;
1980
1981                                 for (dpsf=pmc->mca_tomb; dpsf;
1982                                      dpsf=dpsf->sf_next) {
1983                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1984                                             &psf->sf_addr))
1985                                                 break;
1986                                         prev = dpsf;
1987                                 }
1988                                 if (dpsf) {
1989                                         if (prev)
1990                                                 prev->sf_next = dpsf->sf_next;
1991                                         else
1992                                                 pmc->mca_tomb = dpsf->sf_next;
1993                                         kfree(dpsf);
1994                                 }
1995                                 psf->sf_crcount = qrv;
1996                                 rv++;
1997                         }
1998                 } else if (psf->sf_oldin) {
1999                         psf->sf_crcount = 0;
2000                         /*
2001                          * add or update "delete" records if an active filter
2002                          * is now inactive
2003                          */
2004                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2005                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2006                                     &psf->sf_addr))
2007                                         break;
2008                         if (!dpsf) {
2009                                 dpsf = (struct ip6_sf_list *)
2010                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2011                                 if (!dpsf)
2012                                         continue;
2013                                 *dpsf = *psf;
2014                                 /* pmc->mca_lock held by callers */
2015                                 dpsf->sf_next = pmc->mca_tomb;
2016                                 pmc->mca_tomb = dpsf;
2017                         }
2018                         dpsf->sf_crcount = qrv;
2019                         rv++;
2020                 }
2021         }
2022         return rv;
2023 }
2024
2025 /*
2026  * Add multicast source filter list to the interface list
2027  */
2028 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2029                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2030                           int delta)
2031 {
2032         struct ifmcaddr6 *pmc;
2033         int     isexclude;
2034         int     i, err;
2035
2036         if (!idev)
2037                 return -ENODEV;
2038         read_lock_bh(&idev->lock);
2039         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2040                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2041                         break;
2042         }
2043         if (!pmc) {
2044                 /* MCA not found?? bug */
2045                 read_unlock_bh(&idev->lock);
2046                 return -ESRCH;
2047         }
2048         spin_lock_bh(&pmc->mca_lock);
2049
2050         sf_markstate(pmc);
2051         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2052         if (!delta)
2053                 pmc->mca_sfcount[sfmode]++;
2054         err = 0;
2055         for (i=0; i<sfcount; i++) {
2056                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2057                 if (err)
2058                         break;
2059         }
2060         if (err) {
2061                 int j;
2062
2063                 if (!delta)
2064                         pmc->mca_sfcount[sfmode]--;
2065                 for (j=0; j<i; j++)
2066                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2067         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2068                 struct inet6_dev *idev = pmc->idev;
2069                 struct ip6_sf_list *psf;
2070
2071                 /* filter mode change */
2072                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2073                         pmc->mca_sfmode = MCAST_EXCLUDE;
2074                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2075                         pmc->mca_sfmode = MCAST_INCLUDE;
2076                 /* else no filters; keep old mode for reports */
2077
2078                 pmc->mca_crcount = idev->mc_qrv;
2079                 idev->mc_ifc_count = pmc->mca_crcount;
2080                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2081                         psf->sf_crcount = 0;
2082                 mld_ifc_event(idev);
2083         } else if (sf_setstate(pmc))
2084                 mld_ifc_event(idev);
2085         spin_unlock_bh(&pmc->mca_lock);
2086         read_unlock_bh(&idev->lock);
2087         return err;
2088 }
2089
2090 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2091 {
2092         struct ip6_sf_list *psf, *nextpsf;
2093
2094         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2095                 nextpsf = psf->sf_next;
2096                 kfree(psf);
2097         }
2098         pmc->mca_tomb = NULL;
2099         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2100                 nextpsf = psf->sf_next;
2101                 kfree(psf);
2102         }
2103         pmc->mca_sources = NULL;
2104         pmc->mca_sfmode = MCAST_EXCLUDE;
2105         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2106         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2107 }
2108
2109
2110 static void igmp6_join_group(struct ifmcaddr6 *ma)
2111 {
2112         unsigned long delay;
2113
2114         if (ma->mca_flags & MAF_NOREPORT)
2115                 return;
2116
2117         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2118
2119         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2120
2121         spin_lock_bh(&ma->mca_lock);
2122         if (del_timer(&ma->mca_timer)) {
2123                 atomic_dec(&ma->mca_refcnt);
2124                 delay = ma->mca_timer.expires - jiffies;
2125         }
2126
2127         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2128                 atomic_inc(&ma->mca_refcnt);
2129         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2130         spin_unlock_bh(&ma->mca_lock);
2131 }
2132
2133 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2134                             struct inet6_dev *idev)
2135 {
2136         int err;
2137
2138         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2139          * so no other readers or writers of iml or its sflist
2140          */
2141         if (iml->sflist == 0) {
2142                 /* any-source empty exclude case */
2143                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2144         }
2145         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2146                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2147         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2148         iml->sflist = NULL;
2149         return err;
2150 }
2151
2152 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2153 {
2154         if (MLD_V1_SEEN(ma->idev)) {
2155                 if (ma->mca_flags & MAF_LAST_REPORTER)
2156                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2157                                 ICMPV6_MGM_REDUCTION);
2158         } else {
2159                 mld_add_delrec(ma->idev, ma);
2160                 mld_ifc_event(ma->idev);
2161         }
2162 }
2163
2164 static void mld_gq_timer_expire(unsigned long data)
2165 {
2166         struct inet6_dev *idev = (struct inet6_dev *)data;
2167
2168         idev->mc_gq_running = 0;
2169         mld_send_report(idev, NULL);
2170         __in6_dev_put(idev);
2171 }
2172
2173 static void mld_ifc_timer_expire(unsigned long data)
2174 {
2175         struct inet6_dev *idev = (struct inet6_dev *)data;
2176
2177         mld_send_cr(idev);
2178         if (idev->mc_ifc_count) {
2179                 idev->mc_ifc_count--;
2180                 if (idev->mc_ifc_count)
2181                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2182         }
2183         __in6_dev_put(idev);
2184 }
2185
2186 static void mld_ifc_event(struct inet6_dev *idev)
2187 {
2188         if (MLD_V1_SEEN(idev))
2189                 return;
2190         idev->mc_ifc_count = idev->mc_qrv;
2191         mld_ifc_start_timer(idev, 1);
2192 }
2193
2194
2195 static void igmp6_timer_handler(unsigned long data)
2196 {
2197         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2198
2199         if (MLD_V1_SEEN(ma->idev))
2200                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2201         else
2202                 mld_send_report(ma->idev, ma);
2203
2204         spin_lock(&ma->mca_lock);
2205         ma->mca_flags |=  MAF_LAST_REPORTER;
2206         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2207         spin_unlock(&ma->mca_lock);
2208         ma_put(ma);
2209 }
2210
2211 /* Device going down */
2212
2213 void ipv6_mc_down(struct inet6_dev *idev)
2214 {
2215         struct ifmcaddr6 *i;
2216
2217         /* Withdraw multicast list */
2218
2219         read_lock_bh(&idev->lock);
2220         idev->mc_ifc_count = 0;
2221         if (del_timer(&idev->mc_ifc_timer))
2222                 __in6_dev_put(idev);
2223         idev->mc_gq_running = 0;
2224         if (del_timer(&idev->mc_gq_timer))
2225                 __in6_dev_put(idev);
2226
2227         for (i = idev->mc_list; i; i=i->next)
2228                 igmp6_group_dropped(i);
2229         read_unlock_bh(&idev->lock);
2230
2231         mld_clear_delrec(idev);
2232 }
2233
2234
2235 /* Device going up */
2236
2237 void ipv6_mc_up(struct inet6_dev *idev)
2238 {
2239         struct ifmcaddr6 *i;
2240
2241         /* Install multicast list, except for all-nodes (already installed) */
2242
2243         read_lock_bh(&idev->lock);
2244         for (i = idev->mc_list; i; i=i->next)
2245                 igmp6_group_added(i);
2246         read_unlock_bh(&idev->lock);
2247 }
2248
2249 /* IPv6 device initialization. */
2250
2251 void ipv6_mc_init_dev(struct inet6_dev *idev)
2252 {
2253         struct in6_addr maddr;
2254
2255         write_lock_bh(&idev->lock);
2256         rwlock_init(&idev->mc_lock);
2257         idev->mc_gq_running = 0;
2258         init_timer(&idev->mc_gq_timer);
2259         idev->mc_gq_timer.data = (unsigned long) idev;
2260         idev->mc_gq_timer.function = &mld_gq_timer_expire;
2261         idev->mc_tomb = NULL;
2262         idev->mc_ifc_count = 0;
2263         init_timer(&idev->mc_ifc_timer);
2264         idev->mc_ifc_timer.data = (unsigned long) idev;
2265         idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2266         idev->mc_qrv = MLD_QRV_DEFAULT;
2267         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2268         idev->mc_v1_seen = 0;
2269         write_unlock_bh(&idev->lock);
2270
2271         /* Add all-nodes address. */
2272         ipv6_addr_all_nodes(&maddr);
2273         ipv6_dev_mc_inc(idev->dev, &maddr);
2274 }
2275
2276 /*
2277  *      Device is about to be destroyed: clean up.
2278  */
2279
2280 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2281 {
2282         struct ifmcaddr6 *i;
2283         struct in6_addr maddr;
2284
2285         /* Deactivate timers */
2286         ipv6_mc_down(idev);
2287
2288         /* Delete all-nodes address. */
2289         ipv6_addr_all_nodes(&maddr);
2290
2291         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2292          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2293          * fail.
2294          */
2295         __ipv6_dev_mc_dec(idev, &maddr);
2296
2297         if (idev->cnf.forwarding) {
2298                 ipv6_addr_all_routers(&maddr);
2299                 __ipv6_dev_mc_dec(idev, &maddr);
2300         }
2301
2302         write_lock_bh(&idev->lock);
2303         while ((i = idev->mc_list) != NULL) {
2304                 idev->mc_list = i->next;
2305                 write_unlock_bh(&idev->lock);
2306
2307                 igmp6_group_dropped(i);
2308                 ma_put(i);
2309
2310                 write_lock_bh(&idev->lock);
2311         }
2312         write_unlock_bh(&idev->lock);
2313 }
2314
2315 #ifdef CONFIG_PROC_FS
2316 struct igmp6_mc_iter_state {
2317         struct net_device *dev;
2318         struct inet6_dev *idev;
2319 };
2320
2321 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2322
2323 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2324 {
2325         struct ifmcaddr6 *im = NULL;
2326         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2327
2328         for (state->dev = dev_base, state->idev = NULL;
2329              state->dev;
2330              state->dev = state->dev->next) {
2331                 struct inet6_dev *idev;
2332                 idev = in6_dev_get(state->dev);
2333                 if (!idev)
2334                         continue;
2335                 read_lock_bh(&idev->lock);
2336                 im = idev->mc_list;
2337                 if (im) {
2338                         state->idev = idev;
2339                         break;
2340                 }
2341                 read_unlock_bh(&idev->lock);
2342                 in6_dev_put(idev);
2343         }
2344         return im;
2345 }
2346
2347 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2348 {
2349         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2350
2351         im = im->next;
2352         while (!im) {
2353                 if (likely(state->idev != NULL)) {
2354                         read_unlock_bh(&state->idev->lock);
2355                         in6_dev_put(state->idev);
2356                 }
2357                 state->dev = state->dev->next;
2358                 if (!state->dev) {
2359                         state->idev = NULL;
2360                         break;
2361                 }
2362                 state->idev = in6_dev_get(state->dev);
2363                 if (!state->idev)
2364                         continue;
2365                 read_lock_bh(&state->idev->lock);
2366                 im = state->idev->mc_list;
2367         }
2368         return im;
2369 }
2370
2371 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2372 {
2373         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2374         if (im)
2375                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2376                         --pos;
2377         return pos ? NULL : im;
2378 }
2379
2380 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2381 {
2382         read_lock(&dev_base_lock);
2383         return igmp6_mc_get_idx(seq, *pos);
2384 }
2385
2386 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2387 {
2388         struct ifmcaddr6 *im;
2389         im = igmp6_mc_get_next(seq, v);
2390         ++*pos;
2391         return im;
2392 }
2393
2394 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2395 {
2396         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2397         if (likely(state->idev != NULL)) {
2398                 read_unlock_bh(&state->idev->lock);
2399                 in6_dev_put(state->idev);
2400                 state->idev = NULL;
2401         }
2402         state->dev = NULL;
2403         read_unlock(&dev_base_lock);
2404 }
2405
2406 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2407 {
2408         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2409         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2410
2411         seq_printf(seq,
2412                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2413                    state->dev->ifindex, state->dev->name,
2414                    NIP6(im->mca_addr),
2415                    im->mca_users, im->mca_flags,
2416                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2417                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2418         return 0;
2419 }
2420
2421 static struct seq_operations igmp6_mc_seq_ops = {
2422         .start  =       igmp6_mc_seq_start,
2423         .next   =       igmp6_mc_seq_next,
2424         .stop   =       igmp6_mc_seq_stop,
2425         .show   =       igmp6_mc_seq_show,
2426 };
2427
2428 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2429 {
2430         struct seq_file *seq;
2431         int rc = -ENOMEM;
2432         struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2433
2434         if (!s)
2435                 goto out;
2436
2437         rc = seq_open(file, &igmp6_mc_seq_ops);
2438         if (rc)
2439                 goto out_kfree;
2440
2441         seq = file->private_data;
2442         seq->private = s;
2443 out:
2444         return rc;
2445 out_kfree:
2446         kfree(s);
2447         goto out;
2448 }
2449
2450 static struct file_operations igmp6_mc_seq_fops = {
2451         .owner          =       THIS_MODULE,
2452         .open           =       igmp6_mc_seq_open,
2453         .read           =       seq_read,
2454         .llseek         =       seq_lseek,
2455         .release        =       seq_release_private,
2456 };
2457
2458 struct igmp6_mcf_iter_state {
2459         struct net_device *dev;
2460         struct inet6_dev *idev;
2461         struct ifmcaddr6 *im;
2462 };
2463
2464 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2465
2466 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2467 {
2468         struct ip6_sf_list *psf = NULL;
2469         struct ifmcaddr6 *im = NULL;
2470         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2471
2472         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2473              state->dev;
2474              state->dev = state->dev->next) {
2475                 struct inet6_dev *idev;
2476                 idev = in6_dev_get(state->dev);
2477                 if (unlikely(idev == NULL))
2478                         continue;
2479                 read_lock_bh(&idev->lock);
2480                 im = idev->mc_list;
2481                 if (likely(im != NULL)) {
2482                         spin_lock_bh(&im->mca_lock);
2483                         psf = im->mca_sources;
2484                         if (likely(psf != NULL)) {
2485                                 state->im = im;
2486                                 state->idev = idev;
2487                                 break;
2488                         }
2489                         spin_unlock_bh(&im->mca_lock);
2490                 }
2491                 read_unlock_bh(&idev->lock);
2492                 in6_dev_put(idev);
2493         }
2494         return psf;
2495 }
2496
2497 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2498 {
2499         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2500
2501         psf = psf->sf_next;
2502         while (!psf) {
2503                 spin_unlock_bh(&state->im->mca_lock);
2504                 state->im = state->im->next;
2505                 while (!state->im) {
2506                         if (likely(state->idev != NULL)) {
2507                                 read_unlock_bh(&state->idev->lock);
2508                                 in6_dev_put(state->idev);
2509                         }
2510                         state->dev = state->dev->next;
2511                         if (!state->dev) {
2512                                 state->idev = NULL;
2513                                 goto out;
2514                         }
2515                         state->idev = in6_dev_get(state->dev);
2516                         if (!state->idev)
2517                                 continue;
2518                         read_lock_bh(&state->idev->lock);
2519                         state->im = state->idev->mc_list;
2520                 }
2521                 if (!state->im)
2522                         break;
2523                 spin_lock_bh(&state->im->mca_lock);
2524                 psf = state->im->mca_sources;
2525         }
2526 out:
2527         return psf;
2528 }
2529
2530 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2531 {
2532         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2533         if (psf)
2534                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2535                         --pos;
2536         return pos ? NULL : psf;
2537 }
2538
2539 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2540 {
2541         read_lock(&dev_base_lock);
2542         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2543 }
2544
2545 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2546 {
2547         struct ip6_sf_list *psf;
2548         if (v == SEQ_START_TOKEN)
2549                 psf = igmp6_mcf_get_first(seq);
2550         else
2551                 psf = igmp6_mcf_get_next(seq, v);
2552         ++*pos;
2553         return psf;
2554 }
2555
2556 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2557 {
2558         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2559         if (likely(state->im != NULL)) {
2560                 spin_unlock_bh(&state->im->mca_lock);
2561                 state->im = NULL;
2562         }
2563         if (likely(state->idev != NULL)) {
2564                 read_unlock_bh(&state->idev->lock);
2565                 in6_dev_put(state->idev);
2566                 state->idev = NULL;
2567         }
2568         state->dev = NULL;
2569         read_unlock(&dev_base_lock);
2570 }
2571
2572 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2573 {
2574         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2575         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2576
2577         if (v == SEQ_START_TOKEN) {
2578                 seq_printf(seq,
2579                            "%3s %6s "
2580                            "%32s %32s %6s %6s\n", "Idx",
2581                            "Device", "Multicast Address",
2582                            "Source Address", "INC", "EXC");
2583         } else {
2584                 seq_printf(seq,
2585                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2586                            state->dev->ifindex, state->dev->name,
2587                            NIP6(state->im->mca_addr),
2588                            NIP6(psf->sf_addr),
2589                            psf->sf_count[MCAST_INCLUDE],
2590                            psf->sf_count[MCAST_EXCLUDE]);
2591         }
2592         return 0;
2593 }
2594
2595 static struct seq_operations igmp6_mcf_seq_ops = {
2596         .start  =       igmp6_mcf_seq_start,
2597         .next   =       igmp6_mcf_seq_next,
2598         .stop   =       igmp6_mcf_seq_stop,
2599         .show   =       igmp6_mcf_seq_show,
2600 };
2601
2602 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2603 {
2604         struct seq_file *seq;
2605         int rc = -ENOMEM;
2606         struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2607
2608         if (!s)
2609                 goto out;
2610
2611         rc = seq_open(file, &igmp6_mcf_seq_ops);
2612         if (rc)
2613                 goto out_kfree;
2614
2615         seq = file->private_data;
2616         seq->private = s;
2617 out:
2618         return rc;
2619 out_kfree:
2620         kfree(s);
2621         goto out;
2622 }
2623
2624 static struct file_operations igmp6_mcf_seq_fops = {
2625         .owner          =       THIS_MODULE,
2626         .open           =       igmp6_mcf_seq_open,
2627         .read           =       seq_read,
2628         .llseek         =       seq_lseek,
2629         .release        =       seq_release_private,
2630 };
2631 #endif
2632
2633 int __init igmp6_init(struct net_proto_family *ops)
2634 {
2635         struct ipv6_pinfo *np;
2636         struct sock *sk;
2637         int err;
2638
2639         err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2640         if (err < 0) {
2641                 printk(KERN_ERR
2642                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2643                        err);
2644                 igmp6_socket = NULL; /* For safety. */
2645                 return err;
2646         }
2647
2648         sk = igmp6_socket->sk;
2649         sk->sk_allocation = GFP_ATOMIC;
2650         sk->sk_prot->unhash(sk);
2651
2652         np = inet6_sk(sk);
2653         np->hop_limit = 1;
2654
2655 #ifdef CONFIG_PROC_FS
2656         proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2657         proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2658 #endif
2659
2660         return 0;
2661 }
2662
2663 void igmp6_cleanup(void)
2664 {
2665         sock_release(igmp6_socket);
2666         igmp6_socket = NULL; /* for safety */
2667
2668 #ifdef CONFIG_PROC_FS
2669         proc_net_remove("mcfilter6");
2670         proc_net_remove("igmp6");
2671 #endif
2672 }