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   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
   9  *
  10  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17
  18 /* Changes:
  19  *
  20  *      yoshfuji        : fix format of router-alert option
  21  *      YOSHIFUJI Hideaki @USAGI:
  22  *              Fixed source address for MLD message based on
  23  *              <draft-ietf-magma-mld-source-05.txt>.
  24  *      YOSHIFUJI Hideaki @USAGI:
  25  *              - Ignore Queries for invalid addresses.
  26  *              - MLD for link-local addresses.
  27  *      David L Stevens <dlstevens@us.ibm.com>:
  28  *              - MLDv2 support
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/errno.h>
  33 #include <linux/types.h>
  34 #include <linux/string.h>
  35 #include <linux/socket.h>
  36 #include <linux/sockios.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/times.h>
  39 #include <linux/net.h>
  40 #include <linux/in.h>
  41 #include <linux/in6.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/route.h>
  45 #include <linux/init.h>
  46 #include <linux/proc_fs.h>
  47 #include <linux/seq_file.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /*
  76  *  These header formats should be in a separate include file, but icmpv6.h
  77  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
  78  *  other files reference these.
  79  *
  80  *                      +-DLS 4/14/03
  81  */
  82
  83 /* Multicast Listener Discovery version 2 headers */
  84
  85 struct mld2_grec {
  86         __u8            grec_type;
  87         __u8            grec_auxwords;
  88         __be16          grec_nsrcs;
  89         struct in6_addr grec_mca;
  90         struct in6_addr grec_src[0];
  91 };
  92
  93 struct mld2_report {
  94         __u8    type;
  95         __u8    resv1;
  96         __sum16 csum;
  97         __be16  resv2;
  98         __be16  ngrec;
  99         struct mld2_grec grec[0];
 100 };
 101
 102 struct mld2_query {
 103         __u8 type;
 104         __u8 code;
 105         __sum16 csum;
 106         __be16 mrc;
 107         __be16 resv1;
 108         struct in6_addr mca;
 109 #if defined(__LITTLE_ENDIAN_BITFIELD)
 110         __u8 qrv:3,
 111              suppress:1,
 112              resv2:4;
 113 #elif defined(__BIG_ENDIAN_BITFIELD)
 114         __u8 resv2:4,
 115              suppress:1,
 116              qrv:3;
 117 #else
 118 #error "Please fix <asm/byteorder.h>"
 119 #endif
 120         __u8 qqic;
 121         __be16 nsrcs;
 122         struct in6_addr srcs[0];
 123 };
 124
 125 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 126
 127 /* Big mc list lock for all the sockets */
 128 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
 129
 130 static void igmp6_join_group(struct ifmcaddr6 *ma);
 131 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 132 static void igmp6_timer_handler(unsigned long data);
 133
 134 static void mld_gq_timer_expire(unsigned long data);
 135 static void mld_ifc_timer_expire(unsigned long data);
 136 static void mld_ifc_event(struct inet6_dev *idev);
 137 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 138 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 139 static void mld_clear_delrec(struct inet6_dev *idev);
 140 static int sf_setstate(struct ifmcaddr6 *pmc);
 141 static void sf_markstate(struct ifmcaddr6 *pmc);
 142 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 143 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 144                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 145                           int delta);
 146 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 147                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 148                           int delta);
 149 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 150                             struct inet6_dev *idev);
 151
 152
 153 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 154 #define MLD_QRV_DEFAULT         2
 155
 156 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
 157                 (idev)->cnf.force_mld_version == 1 || \
 158                 ((idev)->mc_v1_seen && \
 159                 time_before(jiffies, (idev)->mc_v1_seen)))
 160
 161 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 162 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 163         ((value) < (thresh) ? (value) : \
 164         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
 165         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 166
 167 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
 168 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 169
 170 #define IPV6_MLD_MAX_MSF        64
 171
 172 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 173
 174 /*
 175  *      socket join on multicast group
 176  */
 177
 178 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 179 {
 180         struct net_device *dev = NULL;
 181         struct ipv6_mc_socklist *mc_lst;
 182         struct ipv6_pinfo *np = inet6_sk(sk);
 183         struct net *net = sock_net(sk);
 184         int err;
 185
 186         if (!ipv6_addr_is_multicast(addr))
 187                 return -EINVAL;
 188
 189         read_lock_bh(&ipv6_sk_mc_lock);
 190         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 191                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 192                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 193                         read_unlock_bh(&ipv6_sk_mc_lock);
 194                         return -EADDRINUSE;
 195                 }
 196         }
 197         read_unlock_bh(&ipv6_sk_mc_lock);
 198
 199         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 200
 201         if (mc_lst == NULL)
 202                 return -ENOMEM;
 203
 204         mc_lst->next = NULL;
 205         ipv6_addr_copy(&mc_lst->addr, addr);
 206
 207         if (ifindex == 0) {
 208                 struct rt6_info *rt;
 209                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 210                 if (rt) {
 211                         dev = rt->rt6i_dev;
 212                         dev_hold(dev);
 213                         dst_release(&rt->u.dst);
 214                 }
 215         } else
 216                 dev = dev_get_by_index(net, ifindex);
 217
 218         if (dev == NULL) {
 219                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 220                 return -ENODEV;
 221         }
 222
 223         mc_lst->ifindex = dev->ifindex;
 224         mc_lst->sfmode = MCAST_EXCLUDE;
 225         rwlock_init(&mc_lst->sflock);
 226         mc_lst->sflist = NULL;
 227
 228         /*
 229          *      now add/increase the group membership on the device
 230          */
 231
 232         err = ipv6_dev_mc_inc(dev, addr);
 233
 234         if (err) {
 235                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 236                 dev_put(dev);
 237                 return err;
 238         }
 239
 240         write_lock_bh(&ipv6_sk_mc_lock);
 241         mc_lst->next = np->ipv6_mc_list;
 242         np->ipv6_mc_list = mc_lst;
 243         write_unlock_bh(&ipv6_sk_mc_lock);
 244
 245         dev_put(dev);
 246
 247         return 0;
 248 }
 249
 250 /*
 251  *      socket leave on multicast group
 252  */
 253 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 254 {
 255         struct ipv6_pinfo *np = inet6_sk(sk);
 256         struct ipv6_mc_socklist *mc_lst, **lnk;
 257         struct net *net = sock_net(sk);
 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                         dev = dev_get_by_index(net, mc_lst->ifindex);
 269                         if (dev != NULL) {
 270                                 struct inet6_dev *idev = in6_dev_get(dev);
 271
 272                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 273                                 if (idev) {
 274                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 275                                         in6_dev_put(idev);
 276                                 }
 277                                 dev_put(dev);
 278                         } else
 279                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 280                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 281                         return 0;
 282                 }
 283         }
 284         write_unlock_bh(&ipv6_sk_mc_lock);
 285
 286         return -EADDRNOTAVAIL;
 287 }
 288
 289 static struct inet6_dev *ip6_mc_find_dev(struct net *net,
 290                                          struct in6_addr *group,
 291                                          int ifindex)
 292 {
 293         struct net_device *dev = NULL;
 294         struct inet6_dev *idev = NULL;
 295
 296         if (ifindex == 0) {
 297                 struct rt6_info *rt;
 298
 299                 rt = rt6_lookup(net, group, NULL, 0, 0);
 300                 if (rt) {
 301                         dev = rt->rt6i_dev;
 302                         dev_hold(dev);
 303                         dst_release(&rt->u.dst);
 304                 }
 305         } else
 306                 dev = dev_get_by_index(net, ifindex);
 307
 308         if (!dev)
 309                 return NULL;
 310         idev = in6_dev_get(dev);
 311         if (!idev) {
 312                 dev_put(dev);
 313                 return NULL;
 314         }
 315         read_lock_bh(&idev->lock);
 316         if (idev->dead) {
 317                 read_unlock_bh(&idev->lock);
 318                 in6_dev_put(idev);
 319                 dev_put(dev);
 320                 return NULL;
 321         }
 322         return idev;
 323 }
 324
 325 void ipv6_sock_mc_close(struct sock *sk)
 326 {
 327         struct ipv6_pinfo *np = inet6_sk(sk);
 328         struct ipv6_mc_socklist *mc_lst;
 329         struct net *net = sock_net(sk);
 330
 331         write_lock_bh(&ipv6_sk_mc_lock);
 332         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 333                 struct net_device *dev;
 334
 335                 np->ipv6_mc_list = mc_lst->next;
 336                 write_unlock_bh(&ipv6_sk_mc_lock);
 337
 338                 dev = dev_get_by_index(net, mc_lst->ifindex);
 339                 if (dev) {
 340                         struct inet6_dev *idev = in6_dev_get(dev);
 341
 342                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 343                         if (idev) {
 344                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 345                                 in6_dev_put(idev);
 346                         }
 347                         dev_put(dev);
 348                 } else
 349                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 350
 351                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 352
 353                 write_lock_bh(&ipv6_sk_mc_lock);
 354         }
 355         write_unlock_bh(&ipv6_sk_mc_lock);
 356 }
 357
 358 int ip6_mc_source(int add, int omode, struct sock *sk,
 359         struct group_source_req *pgsr)
 360 {
 361         struct in6_addr *source, *group;
 362         struct ipv6_mc_socklist *pmc;
 363         struct net_device *dev;
 364         struct inet6_dev *idev;
 365         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 366         struct ip6_sf_socklist *psl;
 367         struct net *net = sock_net(sk);
 368         int i, j, rv;
 369         int leavegroup = 0;
 370         int pmclocked = 0;
 371         int err;
 372
 373         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 374             pgsr->gsr_source.ss_family != AF_INET6)
 375                 return -EINVAL;
 376
 377         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 378         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 379
 380         if (!ipv6_addr_is_multicast(group))
 381                 return -EINVAL;
 382
 383         idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 384         if (!idev)
 385                 return -ENODEV;
 386         dev = idev->dev;
 387
 388         err = -EADDRNOTAVAIL;
 389
 390         read_lock_bh(&ipv6_sk_mc_lock);
 391         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 392                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 393                         continue;
 394                 if (ipv6_addr_equal(&pmc->addr, group))
 395                         break;
 396         }
 397         if (!pmc) {             /* must have a prior join */
 398                 err = -EINVAL;
 399                 goto done;
 400         }
 401         /* if a source filter was set, must be the same mode as before */
 402         if (pmc->sflist) {
 403                 if (pmc->sfmode != omode) {
 404                         err = -EINVAL;
 405                         goto done;
 406                 }
 407         } else if (pmc->sfmode != omode) {
 408                 /* allow mode switches for empty-set filters */
 409                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 410                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 411                 pmc->sfmode = omode;
 412         }
 413
 414         write_lock_bh(&pmc->sflock);
 415         pmclocked = 1;
 416
 417         psl = pmc->sflist;
 418         if (!add) {
 419                 if (!psl)
 420                         goto done;      /* err = -EADDRNOTAVAIL */
 421                 rv = !0;
 422                 for (i=0; i<psl->sl_count; i++) {
 423                         rv = memcmp(&psl->sl_addr[i], source,
 424                                 sizeof(struct in6_addr));
 425                         if (rv == 0)
 426                                 break;
 427                 }
 428                 if (rv)         /* source not found */
 429                         goto done;      /* err = -EADDRNOTAVAIL */
 430
 431                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 432                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 433                         leavegroup = 1;
 434                         goto done;
 435                 }
 436
 437                 /* update the interface filter */
 438                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 439
 440                 for (j=i+1; j<psl->sl_count; j++)
 441                         psl->sl_addr[j-1] = psl->sl_addr[j];
 442                 psl->sl_count--;
 443                 err = 0;
 444                 goto done;
 445         }
 446         /* else, add a new source to the filter */
 447
 448         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 449                 err = -ENOBUFS;
 450                 goto done;
 451         }
 452         if (!psl || psl->sl_count == psl->sl_max) {
 453                 struct ip6_sf_socklist *newpsl;
 454                 int count = IP6_SFBLOCK;
 455
 456                 if (psl)
 457                         count += psl->sl_max;
 458                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 459                 if (!newpsl) {
 460                         err = -ENOBUFS;
 461                         goto done;
 462                 }
 463                 newpsl->sl_max = count;
 464                 newpsl->sl_count = count - IP6_SFBLOCK;
 465                 if (psl) {
 466                         for (i=0; i<psl->sl_count; i++)
 467                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 468                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 469                 }
 470                 pmc->sflist = psl = newpsl;
 471         }
 472         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 473         for (i=0; i<psl->sl_count; i++) {
 474                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 475                 if (rv == 0)
 476                         break;
 477         }
 478         if (rv == 0)            /* address already there is an error */
 479                 goto done;
 480         for (j=psl->sl_count-1; j>=i; j--)
 481                 psl->sl_addr[j+1] = psl->sl_addr[j];
 482         psl->sl_addr[i] = *source;
 483         psl->sl_count++;
 484         err = 0;
 485         /* update the interface list */
 486         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 487 done:
 488         if (pmclocked)
 489                 write_unlock_bh(&pmc->sflock);
 490         read_unlock_bh(&ipv6_sk_mc_lock);
 491         read_unlock_bh(&idev->lock);
 492         in6_dev_put(idev);
 493         dev_put(dev);
 494         if (leavegroup)
 495                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 496         return err;
 497 }
 498
 499 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 500 {
 501         struct in6_addr *group;
 502         struct ipv6_mc_socklist *pmc;
 503         struct net_device *dev;
 504         struct inet6_dev *idev;
 505         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 506         struct ip6_sf_socklist *newpsl, *psl;
 507         struct net *net = sock_net(sk);
 508         int leavegroup = 0;
 509         int i, err;
 510
 511         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 512
 513         if (!ipv6_addr_is_multicast(group))
 514                 return -EINVAL;
 515         if (gsf->gf_fmode != MCAST_INCLUDE &&
 516             gsf->gf_fmode != MCAST_EXCLUDE)
 517                 return -EINVAL;
 518
 519         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 520
 521         if (!idev)
 522                 return -ENODEV;
 523         dev = idev->dev;
 524
 525         err = 0;
 526         read_lock_bh(&ipv6_sk_mc_lock);
 527
 528         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 529                 leavegroup = 1;
 530                 goto done;
 531         }
 532
 533         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 534                 if (pmc->ifindex != gsf->gf_interface)
 535                         continue;
 536                 if (ipv6_addr_equal(&pmc->addr, group))
 537                         break;
 538         }
 539         if (!pmc) {             /* must have a prior join */
 540                 err = -EINVAL;
 541                 goto done;
 542         }
 543         if (gsf->gf_numsrc) {
 544                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 545                                                           GFP_ATOMIC);
 546                 if (!newpsl) {
 547                         err = -ENOBUFS;
 548                         goto done;
 549                 }
 550                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 551                 for (i=0; i<newpsl->sl_count; ++i) {
 552                         struct sockaddr_in6 *psin6;
 553
 554                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 555                         newpsl->sl_addr[i] = psin6->sin6_addr;
 556                 }
 557                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 558                         newpsl->sl_count, newpsl->sl_addr, 0);
 559                 if (err) {
 560                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 561                         goto done;
 562                 }
 563         } else {
 564                 newpsl = NULL;
 565                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 566         }
 567
 568         write_lock_bh(&pmc->sflock);
 569         psl = pmc->sflist;
 570         if (psl) {
 571                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 572                         psl->sl_count, psl->sl_addr, 0);
 573                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 574         } else
 575                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 576         pmc->sflist = newpsl;
 577         pmc->sfmode = gsf->gf_fmode;
 578         write_unlock_bh(&pmc->sflock);
 579         err = 0;
 580 done:
 581         read_unlock_bh(&ipv6_sk_mc_lock);
 582         read_unlock_bh(&idev->lock);
 583         in6_dev_put(idev);
 584         dev_put(dev);
 585         if (leavegroup)
 586                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 587         return err;
 588 }
 589
 590 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 591         struct group_filter __user *optval, int __user *optlen)
 592 {
 593         int err, i, count, copycount;
 594         struct in6_addr *group;
 595         struct ipv6_mc_socklist *pmc;
 596         struct inet6_dev *idev;
 597         struct net_device *dev;
 598         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 599         struct ip6_sf_socklist *psl;
 600         struct net *net = sock_net(sk);
 601
 602         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 603
 604         if (!ipv6_addr_is_multicast(group))
 605                 return -EINVAL;
 606
 607         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 608
 609         if (!idev)
 610                 return -ENODEV;
 611
 612         dev = idev->dev;
 613
 614         err = -EADDRNOTAVAIL;
 615         /*
 616          * changes to the ipv6_mc_list require the socket lock and
 617          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 618          * so reading the list is safe.
 619          */
 620
 621         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 622                 if (pmc->ifindex != gsf->gf_interface)
 623                         continue;
 624                 if (ipv6_addr_equal(group, &pmc->addr))
 625                         break;
 626         }
 627         if (!pmc)               /* must have a prior join */
 628                 goto done;
 629         gsf->gf_fmode = pmc->sfmode;
 630         psl = pmc->sflist;
 631         count = psl ? psl->sl_count : 0;
 632         read_unlock_bh(&idev->lock);
 633         in6_dev_put(idev);
 634         dev_put(dev);
 635
 636         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 637         gsf->gf_numsrc = count;
 638         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 639             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 640                 return -EFAULT;
 641         }
 642         /* changes to psl require the socket lock, a read lock on
 643          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 644          * have the socket lock, so reading here is safe.
 645          */
 646         for (i=0; i<copycount; i++) {
 647                 struct sockaddr_in6 *psin6;
 648                 struct sockaddr_storage ss;
 649
 650                 psin6 = (struct sockaddr_in6 *)&ss;
 651                 memset(&ss, 0, sizeof(ss));
 652                 psin6->sin6_family = AF_INET6;
 653                 psin6->sin6_addr = psl->sl_addr[i];
 654                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 655                         return -EFAULT;
 656         }
 657         return 0;
 658 done:
 659         read_unlock_bh(&idev->lock);
 660         in6_dev_put(idev);
 661         dev_put(dev);
 662         return err;
 663 }
 664
 665 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 666                    const struct in6_addr *src_addr)
 667 {
 668         struct ipv6_pinfo *np = inet6_sk(sk);
 669         struct ipv6_mc_socklist *mc;
 670         struct ip6_sf_socklist *psl;
 671         int rv = 1;
 672
 673         read_lock(&ipv6_sk_mc_lock);
 674         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 675                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 676                         break;
 677         }
 678         if (!mc) {
 679                 read_unlock(&ipv6_sk_mc_lock);
 680                 return 1;
 681         }
 682         read_lock(&mc->sflock);
 683         psl = mc->sflist;
 684         if (!psl) {
 685                 rv = mc->sfmode == MCAST_EXCLUDE;
 686         } else {
 687                 int i;
 688
 689                 for (i=0; i<psl->sl_count; i++) {
 690                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 691                                 break;
 692                 }
 693                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 694                         rv = 0;
 695                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 696                         rv = 0;
 697         }
 698         read_unlock(&mc->sflock);
 699         read_unlock(&ipv6_sk_mc_lock);
 700
 701         return rv;
 702 }
 703
 704 static void ma_put(struct ifmcaddr6 *mc)
 705 {
 706         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 707                 in6_dev_put(mc->idev);
 708                 kfree(mc);
 709         }
 710 }
 711
 712 static void igmp6_group_added(struct ifmcaddr6 *mc)
 713 {
 714         struct net_device *dev = mc->idev->dev;
 715         char buf[MAX_ADDR_LEN];
 716
 717         spin_lock_bh(&mc->mca_lock);
 718         if (!(mc->mca_flags&MAF_LOADED)) {
 719                 mc->mca_flags |= MAF_LOADED;
 720                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 721                         dev_mc_add(dev, buf, dev->addr_len, 0);
 722         }
 723         spin_unlock_bh(&mc->mca_lock);
 724
 725         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 726                 return;
 727
 728         if (MLD_V1_SEEN(mc->idev)) {
 729                 igmp6_join_group(mc);
 730                 return;
 731         }
 732         /* else v2 */
 733
 734         mc->mca_crcount = mc->idev->mc_qrv;
 735         mld_ifc_event(mc->idev);
 736 }
 737
 738 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 739 {
 740         struct net_device *dev = mc->idev->dev;
 741         char buf[MAX_ADDR_LEN];
 742
 743         spin_lock_bh(&mc->mca_lock);
 744         if (mc->mca_flags&MAF_LOADED) {
 745                 mc->mca_flags &= ~MAF_LOADED;
 746                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 747                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 748         }
 749
 750         if (mc->mca_flags & MAF_NOREPORT)
 751                 goto done;
 752         spin_unlock_bh(&mc->mca_lock);
 753
 754         if (!mc->idev->dead)
 755                 igmp6_leave_group(mc);
 756
 757         spin_lock_bh(&mc->mca_lock);
 758         if (del_timer(&mc->mca_timer))
 759                 atomic_dec(&mc->mca_refcnt);
 760 done:
 761         ip6_mc_clear_src(mc);
 762         spin_unlock_bh(&mc->mca_lock);
 763 }
 764
 765 /*
 766  * deleted ifmcaddr6 manipulation
 767  */
 768 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 769 {
 770         struct ifmcaddr6 *pmc;
 771
 772         /* this is an "ifmcaddr6" for convenience; only the fields below
 773          * are actually used. In particular, the refcnt and users are not
 774          * used for management of the delete list. Using the same structure
 775          * for deleted items allows change reports to use common code with
 776          * non-deleted or query-response MCA's.
 777          */
 778         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 779         if (!pmc)
 780                 return;
 781
 782         spin_lock_bh(&im->mca_lock);
 783         spin_lock_init(&pmc->mca_lock);
 784         pmc->idev = im->idev;
 785         in6_dev_hold(idev);
 786         pmc->mca_addr = im->mca_addr;
 787         pmc->mca_crcount = idev->mc_qrv;
 788         pmc->mca_sfmode = im->mca_sfmode;
 789         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 790                 struct ip6_sf_list *psf;
 791
 792                 pmc->mca_tomb = im->mca_tomb;
 793                 pmc->mca_sources = im->mca_sources;
 794                 im->mca_tomb = im->mca_sources = NULL;
 795                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 796                         psf->sf_crcount = pmc->mca_crcount;
 797         }
 798         spin_unlock_bh(&im->mca_lock);
 799
 800         write_lock_bh(&idev->mc_lock);
 801         pmc->next = idev->mc_tomb;
 802         idev->mc_tomb = pmc;
 803         write_unlock_bh(&idev->mc_lock);
 804 }
 805
 806 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 807 {
 808         struct ifmcaddr6 *pmc, *pmc_prev;
 809         struct ip6_sf_list *psf, *psf_next;
 810
 811         write_lock_bh(&idev->mc_lock);
 812         pmc_prev = NULL;
 813         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 814                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 815                         break;
 816                 pmc_prev = pmc;
 817         }
 818         if (pmc) {
 819                 if (pmc_prev)
 820                         pmc_prev->next = pmc->next;
 821                 else
 822                         idev->mc_tomb = pmc->next;
 823         }
 824         write_unlock_bh(&idev->mc_lock);
 825         if (pmc) {
 826                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 827                         psf_next = psf->sf_next;
 828                         kfree(psf);
 829                 }
 830                 in6_dev_put(pmc->idev);
 831                 kfree(pmc);
 832         }
 833 }
 834
 835 static void mld_clear_delrec(struct inet6_dev *idev)
 836 {
 837         struct ifmcaddr6 *pmc, *nextpmc;
 838
 839         write_lock_bh(&idev->mc_lock);
 840         pmc = idev->mc_tomb;
 841         idev->mc_tomb = NULL;
 842         write_unlock_bh(&idev->mc_lock);
 843
 844         for (; pmc; pmc = nextpmc) {
 845                 nextpmc = pmc->next;
 846                 ip6_mc_clear_src(pmc);
 847                 in6_dev_put(pmc->idev);
 848                 kfree(pmc);
 849         }
 850
 851         /* clear dead sources, too */
 852         read_lock_bh(&idev->lock);
 853         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 854                 struct ip6_sf_list *psf, *psf_next;
 855
 856                 spin_lock_bh(&pmc->mca_lock);
 857                 psf = pmc->mca_tomb;
 858                 pmc->mca_tomb = NULL;
 859                 spin_unlock_bh(&pmc->mca_lock);
 860                 for (; psf; psf=psf_next) {
 861                         psf_next = psf->sf_next;
 862                         kfree(psf);
 863                 }
 864         }
 865         read_unlock_bh(&idev->lock);
 866 }
 867
 868
 869 /*
 870  *      device multicast group inc (add if not found)
 871  */
 872 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 873 {
 874         struct ifmcaddr6 *mc;
 875         struct inet6_dev *idev;
 876
 877         idev = in6_dev_get(dev);
 878
 879         if (idev == NULL)
 880                 return -EINVAL;
 881
 882         write_lock_bh(&idev->lock);
 883         if (idev->dead) {
 884                 write_unlock_bh(&idev->lock);
 885                 in6_dev_put(idev);
 886                 return -ENODEV;
 887         }
 888
 889         for (mc = idev->mc_list; mc; mc = mc->next) {
 890                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 891                         mc->mca_users++;
 892                         write_unlock_bh(&idev->lock);
 893                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 894                                 NULL, 0);
 895                         in6_dev_put(idev);
 896                         return 0;
 897                 }
 898         }
 899
 900         /*
 901          *      not found: create a new one.
 902          */
 903
 904         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 905
 906         if (mc == NULL) {
 907                 write_unlock_bh(&idev->lock);
 908                 in6_dev_put(idev);
 909                 return -ENOMEM;
 910         }
 911
 912         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 913
 914         ipv6_addr_copy(&mc->mca_addr, addr);
 915         mc->idev = idev;
 916         mc->mca_users = 1;
 917         /* mca_stamp should be updated upon changes */
 918         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 919         atomic_set(&mc->mca_refcnt, 2);
 920         spin_lock_init(&mc->mca_lock);
 921
 922         /* initial mode is (EX, empty) */
 923         mc->mca_sfmode = MCAST_EXCLUDE;
 924         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 925
 926         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 927             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 928                 mc->mca_flags |= MAF_NOREPORT;
 929
 930         mc->next = idev->mc_list;
 931         idev->mc_list = mc;
 932         write_unlock_bh(&idev->lock);
 933
 934         mld_del_delrec(idev, &mc->mca_addr);
 935         igmp6_group_added(mc);
 936         ma_put(mc);
 937         return 0;
 938 }
 939
 940 /*
 941  *      device multicast group del
 942  */
 943 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 944 {
 945         struct ifmcaddr6 *ma, **map;
 946
 947         write_lock_bh(&idev->lock);
 948         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 949                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 950                         if (--ma->mca_users == 0) {
 951                                 *map = ma->next;
 952                                 write_unlock_bh(&idev->lock);
 953
 954                                 igmp6_group_dropped(ma);
 955
 956                                 ma_put(ma);
 957                                 return 0;
 958                         }
 959                         write_unlock_bh(&idev->lock);
 960                         return 0;
 961                 }
 962         }
 963         write_unlock_bh(&idev->lock);
 964
 965         return -ENOENT;
 966 }
 967
 968 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 969 {
 970         struct inet6_dev *idev = in6_dev_get(dev);
 971         int err;
 972
 973         if (!idev)
 974                 return -ENODEV;
 975
 976         err = __ipv6_dev_mc_dec(idev, addr);
 977
 978         in6_dev_put(idev);
 979
 980         return err;
 981 }
 982
 983 /*
 984  * identify MLD packets for MLD filter exceptions
 985  */
 986 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 987 {
 988         struct icmp6hdr *pic;
 989
 990         if (nexthdr != IPPROTO_ICMPV6)
 991                 return 0;
 992
 993         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 994                 return 0;
 995
 996         pic = icmp6_hdr(skb);
 997
 998         switch (pic->icmp6_type) {
 999         case ICMPV6_MGM_QUERY:
1000         case ICMPV6_MGM_REPORT:
1001         case ICMPV6_MGM_REDUCTION:
1002         case ICMPV6_MLD2_REPORT:
1003                 return 1;
1004         default:
1005                 break;
1006         }
1007         return 0;
1008 }
1009
1010 /*
1011  *      check if the interface/address pair is valid
1012  */
1013 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1014                         const struct in6_addr *src_addr)
1015 {
1016         struct inet6_dev *idev;
1017         struct ifmcaddr6 *mc;
1018         int rv = 0;
1019
1020         idev = in6_dev_get(dev);
1021         if (idev) {
1022                 read_lock_bh(&idev->lock);
1023                 for (mc = idev->mc_list; mc; mc=mc->next) {
1024                         if (ipv6_addr_equal(&mc->mca_addr, group))
1025                                 break;
1026                 }
1027                 if (mc) {
1028                         if (src_addr && !ipv6_addr_any(src_addr)) {
1029                                 struct ip6_sf_list *psf;
1030
1031                                 spin_lock_bh(&mc->mca_lock);
1032                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1033                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1034                                                 break;
1035                                 }
1036                                 if (psf)
1037                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1038                                                 psf->sf_count[MCAST_EXCLUDE] !=
1039                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1040                                 else
1041                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1042                                 spin_unlock_bh(&mc->mca_lock);
1043                         } else
1044                                 rv = 1; /* don't filter unspecified source */
1045                 }
1046                 read_unlock_bh(&idev->lock);
1047                 in6_dev_put(idev);
1048         }
1049         return rv;
1050 }
1051
1052 static void mld_gq_start_timer(struct inet6_dev *idev)
1053 {
1054         int tv = net_random() % idev->mc_maxdelay;
1055
1056         idev->mc_gq_running = 1;
1057         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1058                 in6_dev_hold(idev);
1059 }
1060
1061 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1062 {
1063         int tv = net_random() % delay;
1064
1065         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1066                 in6_dev_hold(idev);
1067 }
1068
1069 /*
1070  *      IGMP handling (alias multicast ICMPv6 messages)
1071  */
1072
1073 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1074 {
1075         unsigned long delay = resptime;
1076
1077         /* Do not start timer for these addresses */
1078         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1079             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1080                 return;
1081
1082         if (del_timer(&ma->mca_timer)) {
1083                 atomic_dec(&ma->mca_refcnt);
1084                 delay = ma->mca_timer.expires - jiffies;
1085         }
1086
1087         if (delay >= resptime) {
1088                 if (resptime)
1089                         delay = net_random() % resptime;
1090                 else
1091                         delay = 1;
1092         }
1093         ma->mca_timer.expires = jiffies + delay;
1094         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1095                 atomic_inc(&ma->mca_refcnt);
1096         ma->mca_flags |= MAF_TIMER_RUNNING;
1097 }
1098
1099 /* mark EXCLUDE-mode sources */
1100 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1101         struct in6_addr *srcs)
1102 {
1103         struct ip6_sf_list *psf;
1104         int i, scount;
1105
1106         scount = 0;
1107         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1108                 if (scount == nsrcs)
1109                         break;
1110                 for (i=0; i<nsrcs; i++) {
1111                         /* skip inactive filters */
1112                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1113                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1114                             psf->sf_count[MCAST_EXCLUDE])
1115                                 continue;
1116                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1117                                 scount++;
1118                                 break;
1119                         }
1120                 }
1121         }
1122         pmc->mca_flags &= ~MAF_GSQUERY;
1123         if (scount == nsrcs)    /* all sources excluded */
1124                 return 0;
1125         return 1;
1126 }
1127
1128 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1129         struct in6_addr *srcs)
1130 {
1131         struct ip6_sf_list *psf;
1132         int i, scount;
1133
1134         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1135                 return mld_xmarksources(pmc, nsrcs, srcs);
1136
1137         /* mark INCLUDE-mode sources */
1138
1139         scount = 0;
1140         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1141                 if (scount == nsrcs)
1142                         break;
1143                 for (i=0; i<nsrcs; i++) {
1144                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1145                                 psf->sf_gsresp = 1;
1146                                 scount++;
1147                                 break;
1148                         }
1149                 }
1150         }
1151         if (!scount) {
1152                 pmc->mca_flags &= ~MAF_GSQUERY;
1153                 return 0;
1154         }
1155         pmc->mca_flags |= MAF_GSQUERY;
1156         return 1;
1157 }
1158
1159 int igmp6_event_query(struct sk_buff *skb)
1160 {
1161         struct mld2_query *mlh2 = NULL;
1162         struct ifmcaddr6 *ma;
1163         struct in6_addr *group;
1164         unsigned long max_delay;
1165         struct inet6_dev *idev;
1166         struct icmp6hdr *hdr;
1167         int group_type;
1168         int mark = 0;
1169         int len;
1170
1171         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1172                 return -EINVAL;
1173
1174         /* compute payload length excluding extension headers */
1175         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1176         len -= skb_network_header_len(skb);
1177
1178         /* Drop queries with not link local source */
1179         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1180                 return -EINVAL;
1181
1182         idev = in6_dev_get(skb->dev);
1183
1184         if (idev == NULL)
1185                 return 0;
1186
1187         hdr = icmp6_hdr(skb);
1188         group = (struct in6_addr *) (hdr + 1);
1189         group_type = ipv6_addr_type(group);
1190
1191         if (group_type != IPV6_ADDR_ANY &&
1192             !(group_type&IPV6_ADDR_MULTICAST)) {
1193                 in6_dev_put(idev);
1194                 return -EINVAL;
1195         }
1196
1197         if (len == 24) {
1198                 int switchback;
1199                 /* MLDv1 router present */
1200
1201                 /* Translate milliseconds to jiffies */
1202                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1203
1204                 switchback = (idev->mc_qrv + 1) * max_delay;
1205                 idev->mc_v1_seen = jiffies + switchback;
1206
1207                 /* cancel the interface change timer */
1208                 idev->mc_ifc_count = 0;
1209                 if (del_timer(&idev->mc_ifc_timer))
1210                         __in6_dev_put(idev);
1211                 /* clear deleted report items */
1212                 mld_clear_delrec(idev);
1213         } else if (len >= 28) {
1214                 int srcs_offset = sizeof(struct mld2_query) -
1215                                   sizeof(struct icmp6hdr);
1216                 if (!pskb_may_pull(skb, srcs_offset)) {
1217                         in6_dev_put(idev);
1218                         return -EINVAL;
1219                 }
1220                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1221                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1222                 if (!max_delay)
1223                         max_delay = 1;
1224                 idev->mc_maxdelay = max_delay;
1225                 if (mlh2->qrv)
1226                         idev->mc_qrv = mlh2->qrv;
1227                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1228                         if (mlh2->nsrcs) {
1229                                 in6_dev_put(idev);
1230                                 return -EINVAL; /* no sources allowed */
1231                         }
1232                         mld_gq_start_timer(idev);
1233                         in6_dev_put(idev);
1234                         return 0;
1235                 }
1236                 /* mark sources to include, if group & source-specific */
1237                 if (mlh2->nsrcs != 0) {
1238                         if (!pskb_may_pull(skb, srcs_offset +
1239                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1240                                 in6_dev_put(idev);
1241                                 return -EINVAL;
1242                         }
1243                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1244                         mark = 1;
1245                 }
1246         } else {
1247                 in6_dev_put(idev);
1248                 return -EINVAL;
1249         }
1250
1251         read_lock_bh(&idev->lock);
1252         if (group_type == IPV6_ADDR_ANY) {
1253                 for (ma = idev->mc_list; ma; ma=ma->next) {
1254                         spin_lock_bh(&ma->mca_lock);
1255                         igmp6_group_queried(ma, max_delay);
1256                         spin_unlock_bh(&ma->mca_lock);
1257                 }
1258         } else {
1259                 for (ma = idev->mc_list; ma; ma=ma->next) {
1260                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1261                                 continue;
1262                         spin_lock_bh(&ma->mca_lock);
1263                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1264                                 /* gsquery <- gsquery && mark */
1265                                 if (!mark)
1266                                         ma->mca_flags &= ~MAF_GSQUERY;
1267                         } else {
1268                                 /* gsquery <- mark */
1269                                 if (mark)
1270                                         ma->mca_flags |= MAF_GSQUERY;
1271                                 else
1272                                         ma->mca_flags &= ~MAF_GSQUERY;
1273                         }
1274                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1275                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1276                                 igmp6_group_queried(ma, max_delay);
1277                         spin_unlock_bh(&ma->mca_lock);
1278                         break;
1279                 }
1280         }
1281         read_unlock_bh(&idev->lock);
1282         in6_dev_put(idev);
1283
1284         return 0;
1285 }
1286
1287
1288 int igmp6_event_report(struct sk_buff *skb)
1289 {
1290         struct ifmcaddr6 *ma;
1291         struct in6_addr *addrp;
1292         struct inet6_dev *idev;
1293         struct icmp6hdr *hdr;
1294         int addr_type;
1295
1296         /* Our own report looped back. Ignore it. */
1297         if (skb->pkt_type == PACKET_LOOPBACK)
1298                 return 0;
1299
1300         /* send our report if the MC router may not have heard this report */
1301         if (skb->pkt_type != PACKET_MULTICAST &&
1302             skb->pkt_type != PACKET_BROADCAST)
1303                 return 0;
1304
1305         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1306                 return -EINVAL;
1307
1308         hdr = icmp6_hdr(skb);
1309
1310         /* Drop reports with not link local source */
1311         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1312         if (addr_type != IPV6_ADDR_ANY &&
1313             !(addr_type&IPV6_ADDR_LINKLOCAL))
1314                 return -EINVAL;
1315
1316         addrp = (struct in6_addr *) (hdr + 1);
1317
1318         idev = in6_dev_get(skb->dev);
1319         if (idev == NULL)
1320                 return -ENODEV;
1321
1322         /*
1323          *      Cancel the timer for this group
1324          */
1325
1326         read_lock_bh(&idev->lock);
1327         for (ma = idev->mc_list; ma; ma=ma->next) {
1328                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1329                         spin_lock(&ma->mca_lock);
1330                         if (del_timer(&ma->mca_timer))
1331                                 atomic_dec(&ma->mca_refcnt);
1332                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1333                         spin_unlock(&ma->mca_lock);
1334                         break;
1335                 }
1336         }
1337         read_unlock_bh(&idev->lock);
1338         in6_dev_put(idev);
1339         return 0;
1340 }
1341
1342 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1343         int gdeleted, int sdeleted)
1344 {
1345         switch (type) {
1346         case MLD2_MODE_IS_INCLUDE:
1347         case MLD2_MODE_IS_EXCLUDE:
1348                 if (gdeleted || sdeleted)
1349                         return 0;
1350                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1351                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1352                                 return 1;
1353                         /* don't include if this source is excluded
1354                          * in all filters
1355                          */
1356                         if (psf->sf_count[MCAST_INCLUDE])
1357                                 return type == MLD2_MODE_IS_INCLUDE;
1358                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1359                                 psf->sf_count[MCAST_EXCLUDE];
1360                 }
1361                 return 0;
1362         case MLD2_CHANGE_TO_INCLUDE:
1363                 if (gdeleted || sdeleted)
1364                         return 0;
1365                 return psf->sf_count[MCAST_INCLUDE] != 0;
1366         case MLD2_CHANGE_TO_EXCLUDE:
1367                 if (gdeleted || sdeleted)
1368                         return 0;
1369                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1370                     psf->sf_count[MCAST_INCLUDE])
1371                         return 0;
1372                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1373                         psf->sf_count[MCAST_EXCLUDE];
1374         case MLD2_ALLOW_NEW_SOURCES:
1375                 if (gdeleted || !psf->sf_crcount)
1376                         return 0;
1377                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1378         case MLD2_BLOCK_OLD_SOURCES:
1379                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1380                         return gdeleted || (psf->sf_crcount && sdeleted);
1381                 return psf->sf_crcount && !gdeleted && !sdeleted;
1382         }
1383         return 0;
1384 }
1385
1386 static int
1387 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1388 {
1389         struct ip6_sf_list *psf;
1390         int scount = 0;
1391
1392         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1393                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1394                         continue;
1395                 scount++;
1396         }
1397         return scount;
1398 }
1399
1400 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1401 {
1402         struct net *net = dev_net(dev);
1403         struct sock *sk = net->ipv6.igmp_sk;
1404         struct sk_buff *skb;
1405         struct mld2_report *pmr;
1406         struct in6_addr addr_buf;
1407         const struct in6_addr *saddr;
1408         int err;
1409         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1410                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1411                      IPV6_TLV_PADN, 0 };
1412
1413         /* we assume size > sizeof(ra) here */
1414         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1415
1416         if (!skb)
1417                 return NULL;
1418
1419         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1420
1421         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1422                 /* <draft-ietf-magma-mld-source-05.txt>:
1423                  * use unspecified address as the source address
1424                  * when a valid link-local address is not available.
1425                  */
1426                 saddr = &in6addr_any;
1427         } else
1428                 saddr = &addr_buf;
1429
1430         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1431
1432         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1433
1434         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1435         skb_put(skb, sizeof(*pmr));
1436         pmr = (struct mld2_report *)skb_transport_header(skb);
1437         pmr->type = ICMPV6_MLD2_REPORT;
1438         pmr->resv1 = 0;
1439         pmr->csum = 0;
1440         pmr->resv2 = 0;
1441         pmr->ngrec = 0;
1442         return skb;
1443 }
1444
1445 static void mld_sendpack(struct sk_buff *skb)
1446 {
1447         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1448         struct mld2_report *pmr =
1449                               (struct mld2_report *)skb_transport_header(skb);
1450         int payload_len, mldlen;
1451         struct inet6_dev *idev = in6_dev_get(skb->dev);
1452         struct net *net = dev_net(skb->dev);
1453         int err;
1454         struct flowi fl;
1455
1456         IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1457         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1458         mldlen = skb->tail - skb->transport_header;
1459         pip6->payload_len = htons(payload_len);
1460
1461         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1462                 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1463                                              mldlen, 0));
1464
1465         skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1466
1467         if (!skb->dst) {
1468                 err = -ENOMEM;
1469                 goto err_out;
1470         }
1471
1472         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1473                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1474                          skb->dev->ifindex);
1475
1476         err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1477         if (err)
1478                 goto err_out;
1479
1480         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1481                       dst_output);
1482 out:
1483         if (!err) {
1484                 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1485                 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1486                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1487         } else
1488                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1489
1490         if (likely(idev != NULL))
1491                 in6_dev_put(idev);
1492         return;
1493
1494 err_out:
1495         kfree_skb(skb);
1496         goto out;
1497 }
1498
1499 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1500 {
1501         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1502 }
1503
1504 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1505         int type, struct mld2_grec **ppgr)
1506 {
1507         struct net_device *dev = pmc->idev->dev;
1508         struct mld2_report *pmr;
1509         struct mld2_grec *pgr;
1510
1511         if (!skb)
1512                 skb = mld_newpack(dev, dev->mtu);
1513         if (!skb)
1514                 return NULL;
1515         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1516         pgr->grec_type = type;
1517         pgr->grec_auxwords = 0;
1518         pgr->grec_nsrcs = 0;
1519         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1520         pmr = (struct mld2_report *)skb_transport_header(skb);
1521         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1522         *ppgr = pgr;
1523         return skb;
1524 }
1525
1526 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1527         skb_tailroom(skb)) : 0)
1528
1529 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1530         int type, int gdeleted, int sdeleted)
1531 {
1532         struct net_device *dev = pmc->idev->dev;
1533         struct mld2_report *pmr;
1534         struct mld2_grec *pgr = NULL;
1535         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1536         int scount, stotal, first, isquery, truncate;
1537
1538         if (pmc->mca_flags & MAF_NOREPORT)
1539                 return skb;
1540
1541         isquery = type == MLD2_MODE_IS_INCLUDE ||
1542                   type == MLD2_MODE_IS_EXCLUDE;
1543         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1544                     type == MLD2_CHANGE_TO_EXCLUDE;
1545
1546         stotal = scount = 0;
1547
1548         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1549
1550         if (!*psf_list)
1551                 goto empty_source;
1552
1553         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1554
1555         /* EX and TO_EX get a fresh packet, if needed */
1556         if (truncate) {
1557                 if (pmr && pmr->ngrec &&
1558                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1559                         if (skb)
1560                                 mld_sendpack(skb);
1561                         skb = mld_newpack(dev, dev->mtu);
1562                 }
1563         }
1564         first = 1;
1565         psf_prev = NULL;
1566         for (psf=*psf_list; psf; psf=psf_next) {
1567                 struct in6_addr *psrc;
1568
1569                 psf_next = psf->sf_next;
1570
1571                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1572                         psf_prev = psf;
1573                         continue;
1574                 }
1575
1576                 /* clear marks on query responses */
1577                 if (isquery)
1578                         psf->sf_gsresp = 0;
1579
1580                 if (AVAILABLE(skb) < sizeof(*psrc) +
1581                     first*sizeof(struct mld2_grec)) {
1582                         if (truncate && !first)
1583                                 break;   /* truncate these */
1584                         if (pgr)
1585                                 pgr->grec_nsrcs = htons(scount);
1586                         if (skb)
1587                                 mld_sendpack(skb);
1588                         skb = mld_newpack(dev, dev->mtu);
1589                         first = 1;
1590                         scount = 0;
1591                 }
1592                 if (first) {
1593                         skb = add_grhead(skb, pmc, type, &pgr);
1594                         first = 0;
1595                 }
1596                 if (!skb)
1597                         return NULL;
1598                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1599                 *psrc = psf->sf_addr;
1600                 scount++; stotal++;
1601                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1602                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1603                         psf->sf_crcount--;
1604                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1605                                 if (psf_prev)
1606                                         psf_prev->sf_next = psf->sf_next;
1607                                 else
1608                                         *psf_list = psf->sf_next;
1609                                 kfree(psf);
1610                                 continue;
1611                         }
1612                 }
1613                 psf_prev = psf;
1614         }
1615
1616 empty_source:
1617         if (!stotal) {
1618                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1619                     type == MLD2_BLOCK_OLD_SOURCES)
1620                         return skb;
1621                 if (pmc->mca_crcount || isquery) {
1622                         /* make sure we have room for group header */
1623                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1624                                 mld_sendpack(skb);
1625                                 skb = NULL; /* add_grhead will get a new one */
1626                         }
1627                         skb = add_grhead(skb, pmc, type, &pgr);
1628                 }
1629         }
1630         if (pgr)
1631                 pgr->grec_nsrcs = htons(scount);
1632
1633         if (isquery)
1634                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1635         return skb;
1636 }
1637
1638 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1639 {
1640         struct sk_buff *skb = NULL;
1641         int type;
1642
1643         if (!pmc) {
1644                 read_lock_bh(&idev->lock);
1645                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1646                         if (pmc->mca_flags & MAF_NOREPORT)
1647                                 continue;
1648                         spin_lock_bh(&pmc->mca_lock);
1649                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1650                                 type = MLD2_MODE_IS_EXCLUDE;
1651                         else
1652                                 type = MLD2_MODE_IS_INCLUDE;
1653                         skb = add_grec(skb, pmc, type, 0, 0);
1654                         spin_unlock_bh(&pmc->mca_lock);
1655                 }
1656                 read_unlock_bh(&idev->lock);
1657         } else {
1658                 spin_lock_bh(&pmc->mca_lock);
1659                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1660                         type = MLD2_MODE_IS_EXCLUDE;
1661                 else
1662                         type = MLD2_MODE_IS_INCLUDE;
1663                 skb = add_grec(skb, pmc, type, 0, 0);
1664                 spin_unlock_bh(&pmc->mca_lock);
1665         }
1666         if (skb)
1667                 mld_sendpack(skb);
1668 }
1669
1670 /*
1671  * remove zero-count source records from a source filter list
1672  */
1673 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1674 {
1675         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1676
1677         psf_prev = NULL;
1678         for (psf=*ppsf; psf; psf = psf_next) {
1679                 psf_next = psf->sf_next;
1680                 if (psf->sf_crcount == 0) {
1681                         if (psf_prev)
1682                                 psf_prev->sf_next = psf->sf_next;
1683                         else
1684                                 *ppsf = psf->sf_next;
1685                         kfree(psf);
1686                 } else
1687                         psf_prev = psf;
1688         }
1689 }
1690
1691 static void mld_send_cr(struct inet6_dev *idev)
1692 {
1693         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1694         struct sk_buff *skb = NULL;
1695         int type, dtype;
1696
1697         read_lock_bh(&idev->lock);
1698         write_lock_bh(&idev->mc_lock);
1699
1700         /* deleted MCA's */
1701         pmc_prev = NULL;
1702         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1703                 pmc_next = pmc->next;
1704                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1705                         type = MLD2_BLOCK_OLD_SOURCES;
1706                         dtype = MLD2_BLOCK_OLD_SOURCES;
1707                         skb = add_grec(skb, pmc, type, 1, 0);
1708                         skb = add_grec(skb, pmc, dtype, 1, 1);
1709                 }
1710                 if (pmc->mca_crcount) {
1711                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1712                                 type = MLD2_CHANGE_TO_INCLUDE;
1713                                 skb = add_grec(skb, pmc, type, 1, 0);
1714                         }
1715                         pmc->mca_crcount--;
1716                         if (pmc->mca_crcount == 0) {
1717                                 mld_clear_zeros(&pmc->mca_tomb);
1718                                 mld_clear_zeros(&pmc->mca_sources);
1719                         }
1720                 }
1721                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1722                     !pmc->mca_sources) {
1723                         if (pmc_prev)
1724                                 pmc_prev->next = pmc_next;
1725                         else
1726                                 idev->mc_tomb = pmc_next;
1727                         in6_dev_put(pmc->idev);
1728                         kfree(pmc);
1729                 } else
1730                         pmc_prev = pmc;
1731         }
1732         write_unlock_bh(&idev->mc_lock);
1733
1734         /* change recs */
1735         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1736                 spin_lock_bh(&pmc->mca_lock);
1737                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1738                         type = MLD2_BLOCK_OLD_SOURCES;
1739                         dtype = MLD2_ALLOW_NEW_SOURCES;
1740                 } else {
1741                         type = MLD2_ALLOW_NEW_SOURCES;
1742                         dtype = MLD2_BLOCK_OLD_SOURCES;
1743                 }
1744                 skb = add_grec(skb, pmc, type, 0, 0);
1745                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1746
1747                 /* filter mode changes */
1748                 if (pmc->mca_crcount) {
1749                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1750                                 type = MLD2_CHANGE_TO_EXCLUDE;
1751                         else
1752                                 type = MLD2_CHANGE_TO_INCLUDE;
1753                         skb = add_grec(skb, pmc, type, 0, 0);
1754                         pmc->mca_crcount--;
1755                 }
1756                 spin_unlock_bh(&pmc->mca_lock);
1757         }
1758         read_unlock_bh(&idev->lock);
1759         if (!skb)
1760                 return;
1761         (void) mld_sendpack(skb);
1762 }
1763
1764 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1765 {
1766         struct net *net = dev_net(dev);
1767         struct sock *sk = net->ipv6.igmp_sk;
1768         struct inet6_dev *idev;
1769         struct sk_buff *skb;
1770         struct icmp6hdr *hdr;
1771         const struct in6_addr *snd_addr, *saddr;
1772         struct in6_addr *addrp;
1773         struct in6_addr addr_buf;
1774         int err, len, payload_len, full_len;
1775         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1776                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1777                      IPV6_TLV_PADN, 0 };
1778         struct flowi fl;
1779
1780         rcu_read_lock();
1781         IP6_INC_STATS(__in6_dev_get(dev),
1782                       IPSTATS_MIB_OUTREQUESTS);
1783         rcu_read_unlock();
1784         if (type == ICMPV6_MGM_REDUCTION)
1785                 snd_addr = &in6addr_linklocal_allrouters;
1786         else
1787                 snd_addr = addr;
1788
1789         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1790         payload_len = len + sizeof(ra);
1791         full_len = sizeof(struct ipv6hdr) + payload_len;
1792
1793         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1794
1795         if (skb == NULL) {
1796                 rcu_read_lock();
1797                 IP6_INC_STATS(__in6_dev_get(dev),
1798                               IPSTATS_MIB_OUTDISCARDS);
1799                 rcu_read_unlock();
1800                 return;
1801         }
1802
1803         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1804
1805         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1806                 /* <draft-ietf-magma-mld-source-05.txt>:
1807                  * use unspecified address as the source address
1808                  * when a valid link-local address is not available.
1809                  */
1810                 saddr = &in6addr_any;
1811         } else
1812                 saddr = &addr_buf;
1813
1814         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1815
1816         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1817
1818         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1819         memset(hdr, 0, sizeof(struct icmp6hdr));
1820         hdr->icmp6_type = type;
1821
1822         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1823         ipv6_addr_copy(addrp, addr);
1824
1825         hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1826                                            IPPROTO_ICMPV6,
1827                                            csum_partial((__u8 *) hdr, len, 0));
1828
1829         idev = in6_dev_get(skb->dev);
1830
1831         skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1832         if (!skb->dst) {
1833                 err = -ENOMEM;
1834                 goto err_out;
1835         }
1836
1837         icmpv6_flow_init(sk, &fl, type,
1838                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1839                          skb->dev->ifindex);
1840
1841         err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1842         if (err)
1843                 goto err_out;
1844
1845         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1846                       dst_output);
1847 out:
1848         if (!err) {
1849                 ICMP6MSGOUT_INC_STATS(idev, type);
1850                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1851                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1852         } else
1853                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1854
1855         if (likely(idev != NULL))
1856                 in6_dev_put(idev);
1857         return;
1858
1859 err_out:
1860         kfree_skb(skb);
1861         goto out;
1862 }
1863
1864 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1865         struct in6_addr *psfsrc)
1866 {
1867         struct ip6_sf_list *psf, *psf_prev;
1868         int rv = 0;
1869
1870         psf_prev = NULL;
1871         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1872                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1873                         break;
1874                 psf_prev = psf;
1875         }
1876         if (!psf || psf->sf_count[sfmode] == 0) {
1877                 /* source filter not found, or count wrong =>  bug */
1878                 return -ESRCH;
1879         }
1880         psf->sf_count[sfmode]--;
1881         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1882                 struct inet6_dev *idev = pmc->idev;
1883
1884                 /* no more filters for this source */
1885                 if (psf_prev)
1886                         psf_prev->sf_next = psf->sf_next;
1887                 else
1888                         pmc->mca_sources = psf->sf_next;
1889                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1890                     !MLD_V1_SEEN(idev)) {
1891                         psf->sf_crcount = idev->mc_qrv;
1892                         psf->sf_next = pmc->mca_tomb;
1893                         pmc->mca_tomb = psf;
1894                         rv = 1;
1895                 } else
1896                         kfree(psf);
1897         }
1898         return rv;
1899 }
1900
1901 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1902                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1903                           int delta)
1904 {
1905         struct ifmcaddr6 *pmc;
1906         int     changerec = 0;
1907         int     i, err;
1908
1909         if (!idev)
1910                 return -ENODEV;
1911         read_lock_bh(&idev->lock);
1912         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1913                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1914                         break;
1915         }
1916         if (!pmc) {
1917                 /* MCA not found?? bug */
1918                 read_unlock_bh(&idev->lock);
1919                 return -ESRCH;
1920         }
1921         spin_lock_bh(&pmc->mca_lock);
1922         sf_markstate(pmc);
1923         if (!delta) {
1924                 if (!pmc->mca_sfcount[sfmode]) {
1925                         spin_unlock_bh(&pmc->mca_lock);
1926                         read_unlock_bh(&idev->lock);
1927                         return -EINVAL;
1928                 }
1929                 pmc->mca_sfcount[sfmode]--;
1930         }
1931         err = 0;
1932         for (i=0; i<sfcount; i++) {
1933                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1934
1935                 changerec |= rv > 0;
1936                 if (!err && rv < 0)
1937                         err = rv;
1938         }
1939         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1940             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1941             pmc->mca_sfcount[MCAST_INCLUDE]) {
1942                 struct ip6_sf_list *psf;
1943
1944                 /* filter mode change */
1945                 pmc->mca_sfmode = MCAST_INCLUDE;
1946                 pmc->mca_crcount = idev->mc_qrv;
1947                 idev->mc_ifc_count = pmc->mca_crcount;
1948                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1949                         psf->sf_crcount = 0;
1950                 mld_ifc_event(pmc->idev);
1951         } else if (sf_setstate(pmc) || changerec)
1952                 mld_ifc_event(pmc->idev);
1953         spin_unlock_bh(&pmc->mca_lock);
1954         read_unlock_bh(&idev->lock);
1955         return err;
1956 }
1957
1958 /*
1959  * Add multicast single-source filter to the interface list
1960  */
1961 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1962         struct in6_addr *psfsrc, int delta)
1963 {
1964         struct ip6_sf_list *psf, *psf_prev;
1965
1966         psf_prev = NULL;
1967         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1968                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1969                         break;
1970                 psf_prev = psf;
1971         }
1972         if (!psf) {
1973                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1974                 if (!psf)
1975                         return -ENOBUFS;
1976
1977                 psf->sf_addr = *psfsrc;
1978                 if (psf_prev) {
1979                         psf_prev->sf_next = psf;
1980                 } else
1981                         pmc->mca_sources = psf;
1982         }
1983         psf->sf_count[sfmode]++;
1984         return 0;
1985 }
1986
1987 static void sf_markstate(struct ifmcaddr6 *pmc)
1988 {
1989         struct ip6_sf_list *psf;
1990         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1991
1992         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1993                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1994                         psf->sf_oldin = mca_xcount ==
1995                                 psf->sf_count[MCAST_EXCLUDE] &&
1996                                 !psf->sf_count[MCAST_INCLUDE];
1997                 } else
1998                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1999 }
2000
2001 static int sf_setstate(struct ifmcaddr6 *pmc)
2002 {
2003         struct ip6_sf_list *psf, *dpsf;
2004         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2005         int qrv = pmc->idev->mc_qrv;
2006         int new_in, rv;
2007
2008         rv = 0;
2009         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2010                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2011                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2012                                 !psf->sf_count[MCAST_INCLUDE];
2013                 } else
2014                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2015                 if (new_in) {
2016                         if (!psf->sf_oldin) {
2017                                 struct ip6_sf_list *prev = NULL;
2018
2019                                 for (dpsf=pmc->mca_tomb; dpsf;
2020                                      dpsf=dpsf->sf_next) {
2021                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2022                                             &psf->sf_addr))
2023                                                 break;
2024                                         prev = dpsf;
2025                                 }
2026                                 if (dpsf) {
2027                                         if (prev)
2028                                                 prev->sf_next = dpsf->sf_next;
2029                                         else
2030                                                 pmc->mca_tomb = dpsf->sf_next;
2031                                         kfree(dpsf);
2032                                 }
2033                                 psf->sf_crcount = qrv;
2034                                 rv++;
2035                         }
2036                 } else if (psf->sf_oldin) {
2037                         psf->sf_crcount = 0;
2038                         /*
2039                          * add or update "delete" records if an active filter
2040                          * is now inactive
2041                          */
2042                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2043                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2044                                     &psf->sf_addr))
2045                                         break;
2046                         if (!dpsf) {
2047                                 dpsf = (struct ip6_sf_list *)
2048                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2049                                 if (!dpsf)
2050                                         continue;
2051                                 *dpsf = *psf;
2052                                 /* pmc->mca_lock held by callers */
2053                                 dpsf->sf_next = pmc->mca_tomb;
2054                                 pmc->mca_tomb = dpsf;
2055                         }
2056                         dpsf->sf_crcount = qrv;
2057                         rv++;
2058                 }
2059         }
2060         return rv;
2061 }
2062
2063 /*
2064  * Add multicast source filter list to the interface list
2065  */
2066 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2067                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2068                           int delta)
2069 {
2070         struct ifmcaddr6 *pmc;
2071         int     isexclude;
2072         int     i, err;
2073
2074         if (!idev)
2075                 return -ENODEV;
2076         read_lock_bh(&idev->lock);
2077         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2078                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2079                         break;
2080         }
2081         if (!pmc) {
2082                 /* MCA not found?? bug */
2083                 read_unlock_bh(&idev->lock);
2084                 return -ESRCH;
2085         }
2086         spin_lock_bh(&pmc->mca_lock);
2087
2088         sf_markstate(pmc);
2089         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2090         if (!delta)
2091                 pmc->mca_sfcount[sfmode]++;
2092         err = 0;
2093         for (i=0; i<sfcount; i++) {
2094                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2095                 if (err)
2096                         break;
2097         }
2098         if (err) {
2099                 int j;
2100
2101                 if (!delta)
2102                         pmc->mca_sfcount[sfmode]--;
2103                 for (j=0; j<i; j++)
2104                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2105         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2106                 struct inet6_dev *idev = pmc->idev;
2107                 struct ip6_sf_list *psf;
2108
2109                 /* filter mode change */
2110                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2111                         pmc->mca_sfmode = MCAST_EXCLUDE;
2112                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2113                         pmc->mca_sfmode = MCAST_INCLUDE;
2114                 /* else no filters; keep old mode for reports */
2115
2116                 pmc->mca_crcount = idev->mc_qrv;
2117                 idev->mc_ifc_count = pmc->mca_crcount;
2118                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2119                         psf->sf_crcount = 0;
2120                 mld_ifc_event(idev);
2121         } else if (sf_setstate(pmc))
2122                 mld_ifc_event(idev);
2123         spin_unlock_bh(&pmc->mca_lock);
2124         read_unlock_bh(&idev->lock);
2125         return err;
2126 }
2127
2128 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2129 {
2130         struct ip6_sf_list *psf, *nextpsf;
2131
2132         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2133                 nextpsf = psf->sf_next;
2134                 kfree(psf);
2135         }
2136         pmc->mca_tomb = NULL;
2137         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2138                 nextpsf = psf->sf_next;
2139                 kfree(psf);
2140         }
2141         pmc->mca_sources = NULL;
2142         pmc->mca_sfmode = MCAST_EXCLUDE;
2143         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2144         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2145 }
2146
2147
2148 static void igmp6_join_group(struct ifmcaddr6 *ma)
2149 {
2150         unsigned long delay;
2151
2152         if (ma->mca_flags & MAF_NOREPORT)
2153                 return;
2154
2155         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2156
2157         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2158
2159         spin_lock_bh(&ma->mca_lock);
2160         if (del_timer(&ma->mca_timer)) {
2161                 atomic_dec(&ma->mca_refcnt);
2162                 delay = ma->mca_timer.expires - jiffies;
2163         }
2164
2165         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2166                 atomic_inc(&ma->mca_refcnt);
2167         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2168         spin_unlock_bh(&ma->mca_lock);
2169 }
2170
2171 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2172                             struct inet6_dev *idev)
2173 {
2174         int err;
2175
2176         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2177          * so no other readers or writers of iml or its sflist
2178          */
2179         if (!iml->sflist) {
2180                 /* any-source empty exclude case */
2181                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2182         }
2183         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2184                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2185         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2186         iml->sflist = NULL;
2187         return err;
2188 }
2189
2190 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2191 {
2192         if (MLD_V1_SEEN(ma->idev)) {
2193                 if (ma->mca_flags & MAF_LAST_REPORTER)
2194                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2195                                 ICMPV6_MGM_REDUCTION);
2196         } else {
2197                 mld_add_delrec(ma->idev, ma);
2198                 mld_ifc_event(ma->idev);
2199         }
2200 }
2201
2202 static void mld_gq_timer_expire(unsigned long data)
2203 {
2204         struct inet6_dev *idev = (struct inet6_dev *)data;
2205
2206         idev->mc_gq_running = 0;
2207         mld_send_report(idev, NULL);
2208         __in6_dev_put(idev);
2209 }
2210
2211 static void mld_ifc_timer_expire(unsigned long data)
2212 {
2213         struct inet6_dev *idev = (struct inet6_dev *)data;
2214
2215         mld_send_cr(idev);
2216         if (idev->mc_ifc_count) {
2217                 idev->mc_ifc_count--;
2218                 if (idev->mc_ifc_count)
2219                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2220         }
2221         __in6_dev_put(idev);
2222 }
2223
2224 static void mld_ifc_event(struct inet6_dev *idev)
2225 {
2226         if (MLD_V1_SEEN(idev))
2227                 return;
2228         idev->mc_ifc_count = idev->mc_qrv;
2229         mld_ifc_start_timer(idev, 1);
2230 }
2231
2232
2233 static void igmp6_timer_handler(unsigned long data)
2234 {
2235         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2236
2237         if (MLD_V1_SEEN(ma->idev))
2238                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2239         else
2240                 mld_send_report(ma->idev, ma);
2241
2242         spin_lock(&ma->mca_lock);
2243         ma->mca_flags |=  MAF_LAST_REPORTER;
2244         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2245         spin_unlock(&ma->mca_lock);
2246         ma_put(ma);
2247 }
2248
2249 /* Device going down */
2250
2251 void ipv6_mc_down(struct inet6_dev *idev)
2252 {
2253         struct ifmcaddr6 *i;
2254
2255         /* Withdraw multicast list */
2256
2257         read_lock_bh(&idev->lock);
2258         idev->mc_ifc_count = 0;
2259         if (del_timer(&idev->mc_ifc_timer))
2260                 __in6_dev_put(idev);
2261         idev->mc_gq_running = 0;
2262         if (del_timer(&idev->mc_gq_timer))
2263                 __in6_dev_put(idev);
2264
2265         for (i = idev->mc_list; i; i=i->next)
2266                 igmp6_group_dropped(i);
2267         read_unlock_bh(&idev->lock);
2268
2269         mld_clear_delrec(idev);
2270 }
2271
2272
2273 /* Device going up */
2274
2275 void ipv6_mc_up(struct inet6_dev *idev)
2276 {
2277         struct ifmcaddr6 *i;
2278
2279         /* Install multicast list, except for all-nodes (already installed) */
2280
2281         read_lock_bh(&idev->lock);
2282         for (i = idev->mc_list; i; i=i->next)
2283                 igmp6_group_added(i);
2284         read_unlock_bh(&idev->lock);
2285 }
2286
2287 /* IPv6 device initialization. */
2288
2289 void ipv6_mc_init_dev(struct inet6_dev *idev)
2290 {
2291         write_lock_bh(&idev->lock);
2292         rwlock_init(&idev->mc_lock);
2293         idev->mc_gq_running = 0;
2294         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2295                         (unsigned long)idev);
2296         idev->mc_tomb = NULL;
2297         idev->mc_ifc_count = 0;
2298         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2299                         (unsigned long)idev);
2300         idev->mc_qrv = MLD_QRV_DEFAULT;
2301         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2302         idev->mc_v1_seen = 0;
2303         write_unlock_bh(&idev->lock);
2304 }
2305
2306 /*
2307  *      Device is about to be destroyed: clean up.
2308  */
2309
2310 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2311 {
2312         struct ifmcaddr6 *i;
2313
2314         /* Deactivate timers */
2315         ipv6_mc_down(idev);
2316
2317         /* Delete all-nodes address. */
2318         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2319          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2320          * fail.
2321          */
2322         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2323
2324         if (idev->cnf.forwarding)
2325                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2326
2327         write_lock_bh(&idev->lock);
2328         while ((i = idev->mc_list) != NULL) {
2329                 idev->mc_list = i->next;
2330                 write_unlock_bh(&idev->lock);
2331
2332                 igmp6_group_dropped(i);
2333                 ma_put(i);
2334
2335                 write_lock_bh(&idev->lock);
2336         }
2337         write_unlock_bh(&idev->lock);
2338 }
2339
2340 #ifdef CONFIG_PROC_FS
2341 struct igmp6_mc_iter_state {
2342         struct seq_net_private p;
2343         struct net_device *dev;
2344         struct inet6_dev *idev;
2345 };
2346
2347 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2348
2349 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2350 {
2351         struct ifmcaddr6 *im = NULL;
2352         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2353         struct net *net = seq_file_net(seq);
2354
2355         state->idev = NULL;
2356         for_each_netdev(net, state->dev) {
2357                 struct inet6_dev *idev;
2358                 idev = in6_dev_get(state->dev);
2359                 if (!idev)
2360                         continue;
2361                 read_lock_bh(&idev->lock);
2362                 im = idev->mc_list;
2363                 if (im) {
2364                         state->idev = idev;
2365                         break;
2366                 }
2367                 read_unlock_bh(&idev->lock);
2368                 in6_dev_put(idev);
2369         }
2370         return im;
2371 }
2372
2373 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2374 {
2375         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2376
2377         im = im->next;
2378         while (!im) {
2379                 if (likely(state->idev != NULL)) {
2380                         read_unlock_bh(&state->idev->lock);
2381                         in6_dev_put(state->idev);
2382                 }
2383                 state->dev = next_net_device(state->dev);
2384                 if (!state->dev) {
2385                         state->idev = NULL;
2386                         break;
2387                 }
2388                 state->idev = in6_dev_get(state->dev);
2389                 if (!state->idev)
2390                         continue;
2391                 read_lock_bh(&state->idev->lock);
2392                 im = state->idev->mc_list;
2393         }
2394         return im;
2395 }
2396
2397 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2398 {
2399         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2400         if (im)
2401                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2402                         --pos;
2403         return pos ? NULL : im;
2404 }
2405
2406 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2407         __acquires(dev_base_lock)
2408 {
2409         read_lock(&dev_base_lock);
2410         return igmp6_mc_get_idx(seq, *pos);
2411 }
2412
2413 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2414 {
2415         struct ifmcaddr6 *im;
2416         im = igmp6_mc_get_next(seq, v);
2417         ++*pos;
2418         return im;
2419 }
2420
2421 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2422         __releases(dev_base_lock)
2423 {
2424         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2425         if (likely(state->idev != NULL)) {
2426                 read_unlock_bh(&state->idev->lock);
2427                 in6_dev_put(state->idev);
2428                 state->idev = NULL;
2429         }
2430         state->dev = NULL;
2431         read_unlock(&dev_base_lock);
2432 }
2433
2434 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2435 {
2436         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2437         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2438
2439         seq_printf(seq,
2440                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2441                    state->dev->ifindex, state->dev->name,
2442                    NIP6(im->mca_addr),
2443                    im->mca_users, im->mca_flags,
2444                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2445                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2446         return 0;
2447 }
2448
2449 static const struct seq_operations igmp6_mc_seq_ops = {
2450         .start  =       igmp6_mc_seq_start,
2451         .next   =       igmp6_mc_seq_next,
2452         .stop   =       igmp6_mc_seq_stop,
2453         .show   =       igmp6_mc_seq_show,
2454 };
2455
2456 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2457 {
2458         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2459                             sizeof(struct igmp6_mc_iter_state));
2460 }
2461
2462 static const struct file_operations igmp6_mc_seq_fops = {
2463         .owner          =       THIS_MODULE,
2464         .open           =       igmp6_mc_seq_open,
2465         .read           =       seq_read,
2466         .llseek         =       seq_lseek,
2467         .release        =       seq_release_net,
2468 };
2469
2470 struct igmp6_mcf_iter_state {
2471         struct seq_net_private p;
2472         struct net_device *dev;
2473         struct inet6_dev *idev;
2474         struct ifmcaddr6 *im;
2475 };
2476
2477 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2478
2479 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2480 {
2481         struct ip6_sf_list *psf = NULL;
2482         struct ifmcaddr6 *im = NULL;
2483         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2484         struct net *net = seq_file_net(seq);
2485
2486         state->idev = NULL;
2487         state->im = NULL;
2488         for_each_netdev(net, state->dev) {
2489                 struct inet6_dev *idev;
2490                 idev = in6_dev_get(state->dev);
2491                 if (unlikely(idev == NULL))
2492                         continue;
2493                 read_lock_bh(&idev->lock);
2494                 im = idev->mc_list;
2495                 if (likely(im != NULL)) {
2496                         spin_lock_bh(&im->mca_lock);
2497                         psf = im->mca_sources;
2498                         if (likely(psf != NULL)) {
2499                                 state->im = im;
2500                                 state->idev = idev;
2501                                 break;
2502                         }
2503                         spin_unlock_bh(&im->mca_lock);
2504                 }
2505                 read_unlock_bh(&idev->lock);
2506                 in6_dev_put(idev);
2507         }
2508         return psf;
2509 }
2510
2511 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2512 {
2513         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2514
2515         psf = psf->sf_next;
2516         while (!psf) {
2517                 spin_unlock_bh(&state->im->mca_lock);
2518                 state->im = state->im->next;
2519                 while (!state->im) {
2520                         if (likely(state->idev != NULL)) {
2521                                 read_unlock_bh(&state->idev->lock);
2522                                 in6_dev_put(state->idev);
2523                         }
2524                         state->dev = next_net_device(state->dev);
2525                         if (!state->dev) {
2526                                 state->idev = NULL;
2527                                 goto out;
2528                         }
2529                         state->idev = in6_dev_get(state->dev);
2530                         if (!state->idev)
2531                                 continue;
2532                         read_lock_bh(&state->idev->lock);
2533                         state->im = state->idev->mc_list;
2534                 }
2535                 if (!state->im)
2536                         break;
2537                 spin_lock_bh(&state->im->mca_lock);
2538                 psf = state->im->mca_sources;
2539         }
2540 out:
2541         return psf;
2542 }
2543
2544 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2545 {
2546         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2547         if (psf)
2548                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2549                         --pos;
2550         return pos ? NULL : psf;
2551 }
2552
2553 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2554         __acquires(dev_base_lock)
2555 {
2556         read_lock(&dev_base_lock);
2557         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2558 }
2559
2560 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2561 {
2562         struct ip6_sf_list *psf;
2563         if (v == SEQ_START_TOKEN)
2564                 psf = igmp6_mcf_get_first(seq);
2565         else
2566                 psf = igmp6_mcf_get_next(seq, v);
2567         ++*pos;
2568         return psf;
2569 }
2570
2571 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2572         __releases(dev_base_lock)
2573 {
2574         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2575         if (likely(state->im != NULL)) {
2576                 spin_unlock_bh(&state->im->mca_lock);
2577                 state->im = NULL;
2578         }
2579         if (likely(state->idev != NULL)) {
2580                 read_unlock_bh(&state->idev->lock);
2581                 in6_dev_put(state->idev);
2582                 state->idev = NULL;
2583         }
2584         state->dev = NULL;
2585         read_unlock(&dev_base_lock);
2586 }
2587
2588 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2589 {
2590         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2591         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2592
2593         if (v == SEQ_START_TOKEN) {
2594                 seq_printf(seq,
2595                            "%3s %6s "
2596                            "%32s %32s %6s %6s\n", "Idx",
2597                            "Device", "Multicast Address",
2598                            "Source Address", "INC", "EXC");
2599         } else {
2600                 seq_printf(seq,
2601                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2602                            state->dev->ifindex, state->dev->name,
2603                            NIP6(state->im->mca_addr),
2604                            NIP6(psf->sf_addr),
2605                            psf->sf_count[MCAST_INCLUDE],
2606                            psf->sf_count[MCAST_EXCLUDE]);
2607         }
2608         return 0;
2609 }
2610
2611 static const struct seq_operations igmp6_mcf_seq_ops = {
2612         .start  =       igmp6_mcf_seq_start,
2613         .next   =       igmp6_mcf_seq_next,
2614         .stop   =       igmp6_mcf_seq_stop,
2615         .show   =       igmp6_mcf_seq_show,
2616 };
2617
2618 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2619 {
2620         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2621                             sizeof(struct igmp6_mcf_iter_state));
2622 }
2623
2624 static const 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_net,
2630 };
2631
2632 static int igmp6_proc_init(struct net *net)
2633 {
2634         int err;
2635
2636         err = -ENOMEM;
2637         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2638                 goto out;
2639         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2640                                   &igmp6_mcf_seq_fops))
2641                 goto out_proc_net_igmp6;
2642
2643         err = 0;
2644 out:
2645         return err;
2646
2647 out_proc_net_igmp6:
2648         proc_net_remove(net, "igmp6");
2649         goto out;
2650 }
2651
2652 static void igmp6_proc_exit(struct net *net)
2653 {
2654         proc_net_remove(net, "mcfilter6");
2655         proc_net_remove(net, "igmp6");
2656 }
2657 #else
2658 static int igmp6_proc_init(struct net *net)
2659 {
2660         return 0;
2661 }
2662 static void igmp6_proc_exit(struct net *net)
2663 {
2664         ;
2665 }
2666 #endif
2667
2668 static int igmp6_net_init(struct net *net)
2669 {
2670         int err;
2671
2672         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2673                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2674         if (err < 0) {
2675                 printk(KERN_ERR
2676                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2677                        err);
2678                 goto out;
2679         }
2680
2681         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2682
2683         err = igmp6_proc_init(net);
2684         if (err)
2685                 goto out_sock_create;
2686 out:
2687         return err;
2688
2689 out_sock_create:
2690         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2691         goto out;
2692 }
2693
2694 static void igmp6_net_exit(struct net *net)
2695 {
2696         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2697         igmp6_proc_exit(net);
2698 }
2699
2700 static struct pernet_operations igmp6_net_ops = {
2701         .init = igmp6_net_init,
2702         .exit = igmp6_net_exit,
2703 };
2704
2705 int __init igmp6_init(void)
2706 {
2707         return register_pernet_subsys(&igmp6_net_ops);
2708 }
2709
2710 void igmp6_cleanup(void)
2711 {
2712         unregister_pernet_subsys(&igmp6_net_ops);
2713 }