net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <net/mld.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 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80 };
  81
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 101                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 104                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 105                           int delta);
 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                             struct inet6_dev *idev);
 108
 109
 110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 111 #define MLD_QRV_DEFAULT         2
 112
 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                 (idev)->cnf.force_mld_version == 1 || \
 115                 ((idev)->mc_v1_seen && \
 116                 time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118 #define IPV6_MLD_MAX_MSF        64
 119
 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122 /*
 123  *      socket join on multicast group
 124  */
 125
 126 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 127 {
 128         struct net_device *dev = NULL;
 129         struct ipv6_mc_socklist *mc_lst;
 130         struct ipv6_pinfo *np = inet6_sk(sk);
 131         struct net *net = sock_net(sk);
 132         int err;
 133
 134         if (!ipv6_addr_is_multicast(addr))
 135                 return -EINVAL;
 136
 137         read_lock_bh(&ipv6_sk_mc_lock);
 138         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 139                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 140                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 141                         read_unlock_bh(&ipv6_sk_mc_lock);
 142                         return -EADDRINUSE;
 143                 }
 144         }
 145         read_unlock_bh(&ipv6_sk_mc_lock);
 146
 147         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 148
 149         if (mc_lst == NULL)
 150                 return -ENOMEM;
 151
 152         mc_lst->next = NULL;
 153         ipv6_addr_copy(&mc_lst->addr, addr);
 154
 155         if (ifindex == 0) {
 156                 struct rt6_info *rt;
 157                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 158                 if (rt) {
 159                         dev = rt->rt6i_dev;
 160                         dev_hold(dev);
 161                         dst_release(&rt->u.dst);
 162                 }
 163         } else
 164                 dev = dev_get_by_index(net, ifindex);
 165
 166         if (dev == NULL) {
 167                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 168                 return -ENODEV;
 169         }
 170
 171         mc_lst->ifindex = dev->ifindex;
 172         mc_lst->sfmode = MCAST_EXCLUDE;
 173         rwlock_init(&mc_lst->sflock);
 174         mc_lst->sflist = NULL;
 175
 176         /*
 177          *      now add/increase the group membership on the device
 178          */
 179
 180         err = ipv6_dev_mc_inc(dev, addr);
 181
 182         if (err) {
 183                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 184                 dev_put(dev);
 185                 return err;
 186         }
 187
 188         write_lock_bh(&ipv6_sk_mc_lock);
 189         mc_lst->next = np->ipv6_mc_list;
 190         np->ipv6_mc_list = mc_lst;
 191         write_unlock_bh(&ipv6_sk_mc_lock);
 192
 193         dev_put(dev);
 194
 195         return 0;
 196 }
 197
 198 /*
 199  *      socket leave on multicast group
 200  */
 201 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 202 {
 203         struct ipv6_pinfo *np = inet6_sk(sk);
 204         struct ipv6_mc_socklist *mc_lst, **lnk;
 205         struct net *net = sock_net(sk);
 206
 207         write_lock_bh(&ipv6_sk_mc_lock);
 208         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 209                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 210                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 211                         struct net_device *dev;
 212
 213                         *lnk = mc_lst->next;
 214                         write_unlock_bh(&ipv6_sk_mc_lock);
 215
 216                         dev = dev_get_by_index(net, mc_lst->ifindex);
 217                         if (dev != NULL) {
 218                                 struct inet6_dev *idev = in6_dev_get(dev);
 219
 220                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 221                                 if (idev) {
 222                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 223                                         in6_dev_put(idev);
 224                                 }
 225                                 dev_put(dev);
 226                         } else
 227                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 228                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 229                         return 0;
 230                 }
 231         }
 232         write_unlock_bh(&ipv6_sk_mc_lock);
 233
 234         return -EADDRNOTAVAIL;
 235 }
 236
 237 static struct inet6_dev *ip6_mc_find_dev(struct net *net,
 238                                          struct in6_addr *group,
 239                                          int ifindex)
 240 {
 241         struct net_device *dev = NULL;
 242         struct inet6_dev *idev = NULL;
 243
 244         if (ifindex == 0) {
 245                 struct rt6_info *rt;
 246
 247                 rt = rt6_lookup(net, group, NULL, 0, 0);
 248                 if (rt) {
 249                         dev = rt->rt6i_dev;
 250                         dev_hold(dev);
 251                         dst_release(&rt->u.dst);
 252                 }
 253         } else
 254                 dev = dev_get_by_index(net, ifindex);
 255
 256         if (!dev)
 257                 goto nodev;
 258         idev = in6_dev_get(dev);
 259         if (!idev)
 260                 goto release;
 261         read_lock_bh(&idev->lock);
 262         if (idev->dead)
 263                 goto unlock_release;
 264
 265         return idev;
 266
 267 unlock_release:
 268         read_unlock_bh(&idev->lock);
 269         in6_dev_put(idev);
 270 release:
 271         dev_put(dev);
 272 nodev:
 273         return NULL;
 274 }
 275
 276 void ipv6_sock_mc_close(struct sock *sk)
 277 {
 278         struct ipv6_pinfo *np = inet6_sk(sk);
 279         struct ipv6_mc_socklist *mc_lst;
 280         struct net *net = sock_net(sk);
 281
 282         write_lock_bh(&ipv6_sk_mc_lock);
 283         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 284                 struct net_device *dev;
 285
 286                 np->ipv6_mc_list = mc_lst->next;
 287                 write_unlock_bh(&ipv6_sk_mc_lock);
 288
 289                 dev = dev_get_by_index(net, mc_lst->ifindex);
 290                 if (dev) {
 291                         struct inet6_dev *idev = in6_dev_get(dev);
 292
 293                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 294                         if (idev) {
 295                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 296                                 in6_dev_put(idev);
 297                         }
 298                         dev_put(dev);
 299                 } else
 300                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 301
 302                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 303
 304                 write_lock_bh(&ipv6_sk_mc_lock);
 305         }
 306         write_unlock_bh(&ipv6_sk_mc_lock);
 307 }
 308
 309 int ip6_mc_source(int add, int omode, struct sock *sk,
 310         struct group_source_req *pgsr)
 311 {
 312         struct in6_addr *source, *group;
 313         struct ipv6_mc_socklist *pmc;
 314         struct net_device *dev;
 315         struct inet6_dev *idev;
 316         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 317         struct ip6_sf_socklist *psl;
 318         struct net *net = sock_net(sk);
 319         int i, j, rv;
 320         int leavegroup = 0;
 321         int pmclocked = 0;
 322         int err;
 323
 324         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 325         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 326
 327         if (!ipv6_addr_is_multicast(group))
 328                 return -EINVAL;
 329
 330         idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 331         if (!idev)
 332                 return -ENODEV;
 333         dev = idev->dev;
 334
 335         err = -EADDRNOTAVAIL;
 336
 337         read_lock_bh(&ipv6_sk_mc_lock);
 338         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 339                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 340                         continue;
 341                 if (ipv6_addr_equal(&pmc->addr, group))
 342                         break;
 343         }
 344         if (!pmc) {             /* must have a prior join */
 345                 err = -EINVAL;
 346                 goto done;
 347         }
 348         /* if a source filter was set, must be the same mode as before */
 349         if (pmc->sflist) {
 350                 if (pmc->sfmode != omode) {
 351                         err = -EINVAL;
 352                         goto done;
 353                 }
 354         } else if (pmc->sfmode != omode) {
 355                 /* allow mode switches for empty-set filters */
 356                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 357                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 358                 pmc->sfmode = omode;
 359         }
 360
 361         write_lock_bh(&pmc->sflock);
 362         pmclocked = 1;
 363
 364         psl = pmc->sflist;
 365         if (!add) {
 366                 if (!psl)
 367                         goto done;      /* err = -EADDRNOTAVAIL */
 368                 rv = !0;
 369                 for (i=0; i<psl->sl_count; i++) {
 370                         rv = memcmp(&psl->sl_addr[i], source,
 371                                 sizeof(struct in6_addr));
 372                         if (rv == 0)
 373                                 break;
 374                 }
 375                 if (rv)         /* source not found */
 376                         goto done;      /* err = -EADDRNOTAVAIL */
 377
 378                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 379                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 380                         leavegroup = 1;
 381                         goto done;
 382                 }
 383
 384                 /* update the interface filter */
 385                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 386
 387                 for (j=i+1; j<psl->sl_count; j++)
 388                         psl->sl_addr[j-1] = psl->sl_addr[j];
 389                 psl->sl_count--;
 390                 err = 0;
 391                 goto done;
 392         }
 393         /* else, add a new source to the filter */
 394
 395         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 396                 err = -ENOBUFS;
 397                 goto done;
 398         }
 399         if (!psl || psl->sl_count == psl->sl_max) {
 400                 struct ip6_sf_socklist *newpsl;
 401                 int count = IP6_SFBLOCK;
 402
 403                 if (psl)
 404                         count += psl->sl_max;
 405                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 406                 if (!newpsl) {
 407                         err = -ENOBUFS;
 408                         goto done;
 409                 }
 410                 newpsl->sl_max = count;
 411                 newpsl->sl_count = count - IP6_SFBLOCK;
 412                 if (psl) {
 413                         for (i=0; i<psl->sl_count; i++)
 414                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 415                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 416                 }
 417                 pmc->sflist = psl = newpsl;
 418         }
 419         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 420         for (i=0; i<psl->sl_count; i++) {
 421                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 422                 if (rv == 0)
 423                         break;
 424         }
 425         if (rv == 0)            /* address already there is an error */
 426                 goto done;
 427         for (j=psl->sl_count-1; j>=i; j--)
 428                 psl->sl_addr[j+1] = psl->sl_addr[j];
 429         psl->sl_addr[i] = *source;
 430         psl->sl_count++;
 431         err = 0;
 432         /* update the interface list */
 433         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 434 done:
 435         if (pmclocked)
 436                 write_unlock_bh(&pmc->sflock);
 437         read_unlock_bh(&ipv6_sk_mc_lock);
 438         read_unlock_bh(&idev->lock);
 439         in6_dev_put(idev);
 440         dev_put(dev);
 441         if (leavegroup)
 442                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 443         return err;
 444 }
 445
 446 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 447 {
 448         struct in6_addr *group;
 449         struct ipv6_mc_socklist *pmc;
 450         struct net_device *dev;
 451         struct inet6_dev *idev;
 452         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 453         struct ip6_sf_socklist *newpsl, *psl;
 454         struct net *net = sock_net(sk);
 455         int leavegroup = 0;
 456         int i, err;
 457
 458         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 459
 460         if (!ipv6_addr_is_multicast(group))
 461                 return -EINVAL;
 462         if (gsf->gf_fmode != MCAST_INCLUDE &&
 463             gsf->gf_fmode != MCAST_EXCLUDE)
 464                 return -EINVAL;
 465
 466         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 467
 468         if (!idev)
 469                 return -ENODEV;
 470         dev = idev->dev;
 471
 472         err = 0;
 473         read_lock_bh(&ipv6_sk_mc_lock);
 474
 475         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 476                 leavegroup = 1;
 477                 goto done;
 478         }
 479
 480         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 481                 if (pmc->ifindex != gsf->gf_interface)
 482                         continue;
 483                 if (ipv6_addr_equal(&pmc->addr, group))
 484                         break;
 485         }
 486         if (!pmc) {             /* must have a prior join */
 487                 err = -EINVAL;
 488                 goto done;
 489         }
 490         if (gsf->gf_numsrc) {
 491                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 492                                                           GFP_ATOMIC);
 493                 if (!newpsl) {
 494                         err = -ENOBUFS;
 495                         goto done;
 496                 }
 497                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 498                 for (i=0; i<newpsl->sl_count; ++i) {
 499                         struct sockaddr_in6 *psin6;
 500
 501                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 502                         newpsl->sl_addr[i] = psin6->sin6_addr;
 503                 }
 504                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 505                         newpsl->sl_count, newpsl->sl_addr, 0);
 506                 if (err) {
 507                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 508                         goto done;
 509                 }
 510         } else {
 511                 newpsl = NULL;
 512                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 513         }
 514
 515         write_lock_bh(&pmc->sflock);
 516         psl = pmc->sflist;
 517         if (psl) {
 518                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 519                         psl->sl_count, psl->sl_addr, 0);
 520                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 521         } else
 522                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 523         pmc->sflist = newpsl;
 524         pmc->sfmode = gsf->gf_fmode;
 525         write_unlock_bh(&pmc->sflock);
 526         err = 0;
 527 done:
 528         read_unlock_bh(&ipv6_sk_mc_lock);
 529         read_unlock_bh(&idev->lock);
 530         in6_dev_put(idev);
 531         dev_put(dev);
 532         if (leavegroup)
 533                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 534         return err;
 535 }
 536
 537 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 538         struct group_filter __user *optval, int __user *optlen)
 539 {
 540         int err, i, count, copycount;
 541         struct in6_addr *group;
 542         struct ipv6_mc_socklist *pmc;
 543         struct inet6_dev *idev;
 544         struct net_device *dev;
 545         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 546         struct ip6_sf_socklist *psl;
 547         struct net *net = sock_net(sk);
 548
 549         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 550
 551         if (!ipv6_addr_is_multicast(group))
 552                 return -EINVAL;
 553
 554         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 555
 556         if (!idev)
 557                 return -ENODEV;
 558
 559         dev = idev->dev;
 560
 561         err = -EADDRNOTAVAIL;
 562         /*
 563          * changes to the ipv6_mc_list require the socket lock and
 564          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 565          * so reading the list is safe.
 566          */
 567
 568         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 569                 if (pmc->ifindex != gsf->gf_interface)
 570                         continue;
 571                 if (ipv6_addr_equal(group, &pmc->addr))
 572                         break;
 573         }
 574         if (!pmc)               /* must have a prior join */
 575                 goto done;
 576         gsf->gf_fmode = pmc->sfmode;
 577         psl = pmc->sflist;
 578         count = psl ? psl->sl_count : 0;
 579         read_unlock_bh(&idev->lock);
 580         in6_dev_put(idev);
 581         dev_put(dev);
 582
 583         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 584         gsf->gf_numsrc = count;
 585         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 586             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 587                 return -EFAULT;
 588         }
 589         /* changes to psl require the socket lock, a read lock on
 590          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 591          * have the socket lock, so reading here is safe.
 592          */
 593         for (i=0; i<copycount; i++) {
 594                 struct sockaddr_in6 *psin6;
 595                 struct sockaddr_storage ss;
 596
 597                 psin6 = (struct sockaddr_in6 *)&ss;
 598                 memset(&ss, 0, sizeof(ss));
 599                 psin6->sin6_family = AF_INET6;
 600                 psin6->sin6_addr = psl->sl_addr[i];
 601                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 602                         return -EFAULT;
 603         }
 604         return 0;
 605 done:
 606         read_unlock_bh(&idev->lock);
 607         in6_dev_put(idev);
 608         dev_put(dev);
 609         return err;
 610 }
 611
 612 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 613                    const struct in6_addr *src_addr)
 614 {
 615         struct ipv6_pinfo *np = inet6_sk(sk);
 616         struct ipv6_mc_socklist *mc;
 617         struct ip6_sf_socklist *psl;
 618         int rv = 1;
 619
 620         read_lock(&ipv6_sk_mc_lock);
 621         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 622                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 623                         break;
 624         }
 625         if (!mc) {
 626                 read_unlock(&ipv6_sk_mc_lock);
 627                 return 1;
 628         }
 629         read_lock(&mc->sflock);
 630         psl = mc->sflist;
 631         if (!psl) {
 632                 rv = mc->sfmode == MCAST_EXCLUDE;
 633         } else {
 634                 int i;
 635
 636                 for (i=0; i<psl->sl_count; i++) {
 637                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 638                                 break;
 639                 }
 640                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 641                         rv = 0;
 642                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 643                         rv = 0;
 644         }
 645         read_unlock(&mc->sflock);
 646         read_unlock(&ipv6_sk_mc_lock);
 647
 648         return rv;
 649 }
 650
 651 static void ma_put(struct ifmcaddr6 *mc)
 652 {
 653         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 654                 in6_dev_put(mc->idev);
 655                 kfree(mc);
 656         }
 657 }
 658
 659 static void igmp6_group_added(struct ifmcaddr6 *mc)
 660 {
 661         struct net_device *dev = mc->idev->dev;
 662         char buf[MAX_ADDR_LEN];
 663
 664         spin_lock_bh(&mc->mca_lock);
 665         if (!(mc->mca_flags&MAF_LOADED)) {
 666                 mc->mca_flags |= MAF_LOADED;
 667                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 668                         dev_mc_add(dev, buf);
 669         }
 670         spin_unlock_bh(&mc->mca_lock);
 671
 672         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 673                 return;
 674
 675         if (MLD_V1_SEEN(mc->idev)) {
 676                 igmp6_join_group(mc);
 677                 return;
 678         }
 679         /* else v2 */
 680
 681         mc->mca_crcount = mc->idev->mc_qrv;
 682         mld_ifc_event(mc->idev);
 683 }
 684
 685 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 686 {
 687         struct net_device *dev = mc->idev->dev;
 688         char buf[MAX_ADDR_LEN];
 689
 690         spin_lock_bh(&mc->mca_lock);
 691         if (mc->mca_flags&MAF_LOADED) {
 692                 mc->mca_flags &= ~MAF_LOADED;
 693                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 694                         dev_mc_del(dev, buf);
 695         }
 696
 697         if (mc->mca_flags & MAF_NOREPORT)
 698                 goto done;
 699         spin_unlock_bh(&mc->mca_lock);
 700
 701         if (!mc->idev->dead)
 702                 igmp6_leave_group(mc);
 703
 704         spin_lock_bh(&mc->mca_lock);
 705         if (del_timer(&mc->mca_timer))
 706                 atomic_dec(&mc->mca_refcnt);
 707 done:
 708         ip6_mc_clear_src(mc);
 709         spin_unlock_bh(&mc->mca_lock);
 710 }
 711
 712 /*
 713  * deleted ifmcaddr6 manipulation
 714  */
 715 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 716 {
 717         struct ifmcaddr6 *pmc;
 718
 719         /* this is an "ifmcaddr6" for convenience; only the fields below
 720          * are actually used. In particular, the refcnt and users are not
 721          * used for management of the delete list. Using the same structure
 722          * for deleted items allows change reports to use common code with
 723          * non-deleted or query-response MCA's.
 724          */
 725         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 726         if (!pmc)
 727                 return;
 728
 729         spin_lock_bh(&im->mca_lock);
 730         spin_lock_init(&pmc->mca_lock);
 731         pmc->idev = im->idev;
 732         in6_dev_hold(idev);
 733         pmc->mca_addr = im->mca_addr;
 734         pmc->mca_crcount = idev->mc_qrv;
 735         pmc->mca_sfmode = im->mca_sfmode;
 736         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 737                 struct ip6_sf_list *psf;
 738
 739                 pmc->mca_tomb = im->mca_tomb;
 740                 pmc->mca_sources = im->mca_sources;
 741                 im->mca_tomb = im->mca_sources = NULL;
 742                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 743                         psf->sf_crcount = pmc->mca_crcount;
 744         }
 745         spin_unlock_bh(&im->mca_lock);
 746
 747         spin_lock_bh(&idev->mc_lock);
 748         pmc->next = idev->mc_tomb;
 749         idev->mc_tomb = pmc;
 750         spin_unlock_bh(&idev->mc_lock);
 751 }
 752
 753 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 754 {
 755         struct ifmcaddr6 *pmc, *pmc_prev;
 756         struct ip6_sf_list *psf, *psf_next;
 757
 758         spin_lock_bh(&idev->mc_lock);
 759         pmc_prev = NULL;
 760         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 761                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 762                         break;
 763                 pmc_prev = pmc;
 764         }
 765         if (pmc) {
 766                 if (pmc_prev)
 767                         pmc_prev->next = pmc->next;
 768                 else
 769                         idev->mc_tomb = pmc->next;
 770         }
 771         spin_unlock_bh(&idev->mc_lock);
 772
 773         if (pmc) {
 774                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 775                         psf_next = psf->sf_next;
 776                         kfree(psf);
 777                 }
 778                 in6_dev_put(pmc->idev);
 779                 kfree(pmc);
 780         }
 781 }
 782
 783 static void mld_clear_delrec(struct inet6_dev *idev)
 784 {
 785         struct ifmcaddr6 *pmc, *nextpmc;
 786
 787         spin_lock_bh(&idev->mc_lock);
 788         pmc = idev->mc_tomb;
 789         idev->mc_tomb = NULL;
 790         spin_unlock_bh(&idev->mc_lock);
 791
 792         for (; pmc; pmc = nextpmc) {
 793                 nextpmc = pmc->next;
 794                 ip6_mc_clear_src(pmc);
 795                 in6_dev_put(pmc->idev);
 796                 kfree(pmc);
 797         }
 798
 799         /* clear dead sources, too */
 800         read_lock_bh(&idev->lock);
 801         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 802                 struct ip6_sf_list *psf, *psf_next;
 803
 804                 spin_lock_bh(&pmc->mca_lock);
 805                 psf = pmc->mca_tomb;
 806                 pmc->mca_tomb = NULL;
 807                 spin_unlock_bh(&pmc->mca_lock);
 808                 for (; psf; psf=psf_next) {
 809                         psf_next = psf->sf_next;
 810                         kfree(psf);
 811                 }
 812         }
 813         read_unlock_bh(&idev->lock);
 814 }
 815
 816
 817 /*
 818  *      device multicast group inc (add if not found)
 819  */
 820 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 821 {
 822         struct ifmcaddr6 *mc;
 823         struct inet6_dev *idev;
 824
 825         idev = in6_dev_get(dev);
 826
 827         if (idev == NULL)
 828                 return -EINVAL;
 829
 830         write_lock_bh(&idev->lock);
 831         if (idev->dead) {
 832                 write_unlock_bh(&idev->lock);
 833                 in6_dev_put(idev);
 834                 return -ENODEV;
 835         }
 836
 837         for (mc = idev->mc_list; mc; mc = mc->next) {
 838                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 839                         mc->mca_users++;
 840                         write_unlock_bh(&idev->lock);
 841                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 842                                 NULL, 0);
 843                         in6_dev_put(idev);
 844                         return 0;
 845                 }
 846         }
 847
 848         /*
 849          *      not found: create a new one.
 850          */
 851
 852         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 853
 854         if (mc == NULL) {
 855                 write_unlock_bh(&idev->lock);
 856                 in6_dev_put(idev);
 857                 return -ENOMEM;
 858         }
 859
 860         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 861
 862         ipv6_addr_copy(&mc->mca_addr, addr);
 863         mc->idev = idev;
 864         mc->mca_users = 1;
 865         /* mca_stamp should be updated upon changes */
 866         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 867         atomic_set(&mc->mca_refcnt, 2);
 868         spin_lock_init(&mc->mca_lock);
 869
 870         /* initial mode is (EX, empty) */
 871         mc->mca_sfmode = MCAST_EXCLUDE;
 872         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 873
 874         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 875             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 876                 mc->mca_flags |= MAF_NOREPORT;
 877
 878         mc->next = idev->mc_list;
 879         idev->mc_list = mc;
 880         write_unlock_bh(&idev->lock);
 881
 882         mld_del_delrec(idev, &mc->mca_addr);
 883         igmp6_group_added(mc);
 884         ma_put(mc);
 885         return 0;
 886 }
 887
 888 /*
 889  *      device multicast group del
 890  */
 891 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 892 {
 893         struct ifmcaddr6 *ma, **map;
 894
 895         write_lock_bh(&idev->lock);
 896         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 897                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 898                         if (--ma->mca_users == 0) {
 899                                 *map = ma->next;
 900                                 write_unlock_bh(&idev->lock);
 901
 902                                 igmp6_group_dropped(ma);
 903
 904                                 ma_put(ma);
 905                                 return 0;
 906                         }
 907                         write_unlock_bh(&idev->lock);
 908                         return 0;
 909                 }
 910         }
 911         write_unlock_bh(&idev->lock);
 912
 913         return -ENOENT;
 914 }
 915
 916 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 917 {
 918         struct inet6_dev *idev = in6_dev_get(dev);
 919         int err;
 920
 921         if (!idev)
 922                 return -ENODEV;
 923
 924         err = __ipv6_dev_mc_dec(idev, addr);
 925
 926         in6_dev_put(idev);
 927
 928         return err;
 929 }
 930
 931 /*
 932  * identify MLD packets for MLD filter exceptions
 933  */
 934 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 935 {
 936         struct icmp6hdr *pic;
 937
 938         if (nexthdr != IPPROTO_ICMPV6)
 939                 return 0;
 940
 941         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 942                 return 0;
 943
 944         pic = icmp6_hdr(skb);
 945
 946         switch (pic->icmp6_type) {
 947         case ICMPV6_MGM_QUERY:
 948         case ICMPV6_MGM_REPORT:
 949         case ICMPV6_MGM_REDUCTION:
 950         case ICMPV6_MLD2_REPORT:
 951                 return 1;
 952         default:
 953                 break;
 954         }
 955         return 0;
 956 }
 957
 958 /*
 959  *      check if the interface/address pair is valid
 960  */
 961 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 962                         const struct in6_addr *src_addr)
 963 {
 964         struct inet6_dev *idev;
 965         struct ifmcaddr6 *mc;
 966         int rv = 0;
 967
 968         idev = in6_dev_get(dev);
 969         if (idev) {
 970                 read_lock_bh(&idev->lock);
 971                 for (mc = idev->mc_list; mc; mc=mc->next) {
 972                         if (ipv6_addr_equal(&mc->mca_addr, group))
 973                                 break;
 974                 }
 975                 if (mc) {
 976                         if (src_addr && !ipv6_addr_any(src_addr)) {
 977                                 struct ip6_sf_list *psf;
 978
 979                                 spin_lock_bh(&mc->mca_lock);
 980                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 981                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 982                                                 break;
 983                                 }
 984                                 if (psf)
 985                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 986                                                 psf->sf_count[MCAST_EXCLUDE] !=
 987                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 988                                 else
 989                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 990                                 spin_unlock_bh(&mc->mca_lock);
 991                         } else
 992                                 rv = 1; /* don't filter unspecified source */
 993                 }
 994                 read_unlock_bh(&idev->lock);
 995                 in6_dev_put(idev);
 996         }
 997         return rv;
 998 }
 999
1000 static void mld_gq_start_timer(struct inet6_dev *idev)
1001 {
1002         int tv = net_random() % idev->mc_maxdelay;
1003
1004         idev->mc_gq_running = 1;
1005         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006                 in6_dev_hold(idev);
1007 }
1008
1009 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1010 {
1011         int tv = net_random() % delay;
1012
1013         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1014                 in6_dev_hold(idev);
1015 }
1016
1017 /*
1018  *      IGMP handling (alias multicast ICMPv6 messages)
1019  */
1020
1021 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1022 {
1023         unsigned long delay = resptime;
1024
1025         /* Do not start timer for these addresses */
1026         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1027             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1028                 return;
1029
1030         if (del_timer(&ma->mca_timer)) {
1031                 atomic_dec(&ma->mca_refcnt);
1032                 delay = ma->mca_timer.expires - jiffies;
1033         }
1034
1035         if (delay >= resptime) {
1036                 if (resptime)
1037                         delay = net_random() % resptime;
1038                 else
1039                         delay = 1;
1040         }
1041         ma->mca_timer.expires = jiffies + delay;
1042         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1043                 atomic_inc(&ma->mca_refcnt);
1044         ma->mca_flags |= MAF_TIMER_RUNNING;
1045 }
1046
1047 /* mark EXCLUDE-mode sources */
1048 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1049         struct in6_addr *srcs)
1050 {
1051         struct ip6_sf_list *psf;
1052         int i, scount;
1053
1054         scount = 0;
1055         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1056                 if (scount == nsrcs)
1057                         break;
1058                 for (i=0; i<nsrcs; i++) {
1059                         /* skip inactive filters */
1060                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1061                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1062                             psf->sf_count[MCAST_EXCLUDE])
1063                                 continue;
1064                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1065                                 scount++;
1066                                 break;
1067                         }
1068                 }
1069         }
1070         pmc->mca_flags &= ~MAF_GSQUERY;
1071         if (scount == nsrcs)    /* all sources excluded */
1072                 return 0;
1073         return 1;
1074 }
1075
1076 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1077         struct in6_addr *srcs)
1078 {
1079         struct ip6_sf_list *psf;
1080         int i, scount;
1081
1082         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1083                 return mld_xmarksources(pmc, nsrcs, srcs);
1084
1085         /* mark INCLUDE-mode sources */
1086
1087         scount = 0;
1088         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1089                 if (scount == nsrcs)
1090                         break;
1091                 for (i=0; i<nsrcs; i++) {
1092                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1093                                 psf->sf_gsresp = 1;
1094                                 scount++;
1095                                 break;
1096                         }
1097                 }
1098         }
1099         if (!scount) {
1100                 pmc->mca_flags &= ~MAF_GSQUERY;
1101                 return 0;
1102         }
1103         pmc->mca_flags |= MAF_GSQUERY;
1104         return 1;
1105 }
1106
1107 int igmp6_event_query(struct sk_buff *skb)
1108 {
1109         struct mld2_query *mlh2 = NULL;
1110         struct ifmcaddr6 *ma;
1111         struct in6_addr *group;
1112         unsigned long max_delay;
1113         struct inet6_dev *idev;
1114         struct mld_msg *mld;
1115         int group_type;
1116         int mark = 0;
1117         int len;
1118
1119         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1120                 return -EINVAL;
1121
1122         /* compute payload length excluding extension headers */
1123         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1124         len -= skb_network_header_len(skb);
1125
1126         /* Drop queries with not link local source */
1127         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1128                 return -EINVAL;
1129
1130         idev = in6_dev_get(skb->dev);
1131
1132         if (idev == NULL)
1133                 return 0;
1134
1135         mld = (struct mld_msg *)icmp6_hdr(skb);
1136         group = &mld->mld_mca;
1137         group_type = ipv6_addr_type(group);
1138
1139         if (group_type != IPV6_ADDR_ANY &&
1140             !(group_type&IPV6_ADDR_MULTICAST)) {
1141                 in6_dev_put(idev);
1142                 return -EINVAL;
1143         }
1144
1145         if (len == 24) {
1146                 int switchback;
1147                 /* MLDv1 router present */
1148
1149                 /* Translate milliseconds to jiffies */
1150                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1151
1152                 switchback = (idev->mc_qrv + 1) * max_delay;
1153                 idev->mc_v1_seen = jiffies + switchback;
1154
1155                 /* cancel the interface change timer */
1156                 idev->mc_ifc_count = 0;
1157                 if (del_timer(&idev->mc_ifc_timer))
1158                         __in6_dev_put(idev);
1159                 /* clear deleted report items */
1160                 mld_clear_delrec(idev);
1161         } else if (len >= 28) {
1162                 int srcs_offset = sizeof(struct mld2_query) -
1163                                   sizeof(struct icmp6hdr);
1164                 if (!pskb_may_pull(skb, srcs_offset)) {
1165                         in6_dev_put(idev);
1166                         return -EINVAL;
1167                 }
1168                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1169                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1170                 if (!max_delay)
1171                         max_delay = 1;
1172                 idev->mc_maxdelay = max_delay;
1173                 if (mlh2->mld2q_qrv)
1174                         idev->mc_qrv = mlh2->mld2q_qrv;
1175                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1176                         if (mlh2->mld2q_nsrcs) {
1177                                 in6_dev_put(idev);
1178                                 return -EINVAL; /* no sources allowed */
1179                         }
1180                         mld_gq_start_timer(idev);
1181                         in6_dev_put(idev);
1182                         return 0;
1183                 }
1184                 /* mark sources to include, if group & source-specific */
1185                 if (mlh2->mld2q_nsrcs != 0) {
1186                         if (!pskb_may_pull(skb, srcs_offset +
1187                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) {
1188                                 in6_dev_put(idev);
1189                                 return -EINVAL;
1190                         }
1191                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1192                         mark = 1;
1193                 }
1194         } else {
1195                 in6_dev_put(idev);
1196                 return -EINVAL;
1197         }
1198
1199         read_lock_bh(&idev->lock);
1200         if (group_type == IPV6_ADDR_ANY) {
1201                 for (ma = idev->mc_list; ma; ma=ma->next) {
1202                         spin_lock_bh(&ma->mca_lock);
1203                         igmp6_group_queried(ma, max_delay);
1204                         spin_unlock_bh(&ma->mca_lock);
1205                 }
1206         } else {
1207                 for (ma = idev->mc_list; ma; ma=ma->next) {
1208                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1209                                 continue;
1210                         spin_lock_bh(&ma->mca_lock);
1211                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1212                                 /* gsquery <- gsquery && mark */
1213                                 if (!mark)
1214                                         ma->mca_flags &= ~MAF_GSQUERY;
1215                         } else {
1216                                 /* gsquery <- mark */
1217                                 if (mark)
1218                                         ma->mca_flags |= MAF_GSQUERY;
1219                                 else
1220                                         ma->mca_flags &= ~MAF_GSQUERY;
1221                         }
1222                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1223                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1224                                 igmp6_group_queried(ma, max_delay);
1225                         spin_unlock_bh(&ma->mca_lock);
1226                         break;
1227                 }
1228         }
1229         read_unlock_bh(&idev->lock);
1230         in6_dev_put(idev);
1231
1232         return 0;
1233 }
1234
1235
1236 int igmp6_event_report(struct sk_buff *skb)
1237 {
1238         struct ifmcaddr6 *ma;
1239         struct inet6_dev *idev;
1240         struct mld_msg *mld;
1241         int addr_type;
1242
1243         /* Our own report looped back. Ignore it. */
1244         if (skb->pkt_type == PACKET_LOOPBACK)
1245                 return 0;
1246
1247         /* send our report if the MC router may not have heard this report */
1248         if (skb->pkt_type != PACKET_MULTICAST &&
1249             skb->pkt_type != PACKET_BROADCAST)
1250                 return 0;
1251
1252         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1253                 return -EINVAL;
1254
1255         mld = (struct mld_msg *)icmp6_hdr(skb);
1256
1257         /* Drop reports with not link local source */
1258         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1259         if (addr_type != IPV6_ADDR_ANY &&
1260             !(addr_type&IPV6_ADDR_LINKLOCAL))
1261                 return -EINVAL;
1262
1263         idev = in6_dev_get(skb->dev);
1264         if (idev == NULL)
1265                 return -ENODEV;
1266
1267         /*
1268          *      Cancel the timer for this group
1269          */
1270
1271         read_lock_bh(&idev->lock);
1272         for (ma = idev->mc_list; ma; ma=ma->next) {
1273                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1274                         spin_lock(&ma->mca_lock);
1275                         if (del_timer(&ma->mca_timer))
1276                                 atomic_dec(&ma->mca_refcnt);
1277                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1278                         spin_unlock(&ma->mca_lock);
1279                         break;
1280                 }
1281         }
1282         read_unlock_bh(&idev->lock);
1283         in6_dev_put(idev);
1284         return 0;
1285 }
1286
1287 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1288         int gdeleted, int sdeleted)
1289 {
1290         switch (type) {
1291         case MLD2_MODE_IS_INCLUDE:
1292         case MLD2_MODE_IS_EXCLUDE:
1293                 if (gdeleted || sdeleted)
1294                         return 0;
1295                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1296                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1297                                 return 1;
1298                         /* don't include if this source is excluded
1299                          * in all filters
1300                          */
1301                         if (psf->sf_count[MCAST_INCLUDE])
1302                                 return type == MLD2_MODE_IS_INCLUDE;
1303                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1304                                 psf->sf_count[MCAST_EXCLUDE];
1305                 }
1306                 return 0;
1307         case MLD2_CHANGE_TO_INCLUDE:
1308                 if (gdeleted || sdeleted)
1309                         return 0;
1310                 return psf->sf_count[MCAST_INCLUDE] != 0;
1311         case MLD2_CHANGE_TO_EXCLUDE:
1312                 if (gdeleted || sdeleted)
1313                         return 0;
1314                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1315                     psf->sf_count[MCAST_INCLUDE])
1316                         return 0;
1317                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1318                         psf->sf_count[MCAST_EXCLUDE];
1319         case MLD2_ALLOW_NEW_SOURCES:
1320                 if (gdeleted || !psf->sf_crcount)
1321                         return 0;
1322                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1323         case MLD2_BLOCK_OLD_SOURCES:
1324                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1325                         return gdeleted || (psf->sf_crcount && sdeleted);
1326                 return psf->sf_crcount && !gdeleted && !sdeleted;
1327         }
1328         return 0;
1329 }
1330
1331 static int
1332 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1333 {
1334         struct ip6_sf_list *psf;
1335         int scount = 0;
1336
1337         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1338                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1339                         continue;
1340                 scount++;
1341         }
1342         return scount;
1343 }
1344
1345 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1346 {
1347         struct net *net = dev_net(dev);
1348         struct sock *sk = net->ipv6.igmp_sk;
1349         struct sk_buff *skb;
1350         struct mld2_report *pmr;
1351         struct in6_addr addr_buf;
1352         const struct in6_addr *saddr;
1353         int err;
1354         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1355                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1356                      IPV6_TLV_PADN, 0 };
1357
1358         /* we assume size > sizeof(ra) here */
1359         size += LL_ALLOCATED_SPACE(dev);
1360         /* limit our allocations to order-0 page */
1361         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1362         skb = sock_alloc_send_skb(sk, size, 1, &err);
1363
1364         if (!skb)
1365                 return NULL;
1366
1367         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1368
1369         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1370                 /* <draft-ietf-magma-mld-source-05.txt>:
1371                  * use unspecified address as the source address
1372                  * when a valid link-local address is not available.
1373                  */
1374                 saddr = &in6addr_any;
1375         } else
1376                 saddr = &addr_buf;
1377
1378         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1379
1380         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1381
1382         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1383         skb_put(skb, sizeof(*pmr));
1384         pmr = (struct mld2_report *)skb_transport_header(skb);
1385         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1386         pmr->mld2r_resv1 = 0;
1387         pmr->mld2r_cksum = 0;
1388         pmr->mld2r_resv2 = 0;
1389         pmr->mld2r_ngrec = 0;
1390         return skb;
1391 }
1392
1393 static void mld_sendpack(struct sk_buff *skb)
1394 {
1395         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1396         struct mld2_report *pmr =
1397                               (struct mld2_report *)skb_transport_header(skb);
1398         int payload_len, mldlen;
1399         struct inet6_dev *idev = in6_dev_get(skb->dev);
1400         struct net *net = dev_net(skb->dev);
1401         int err;
1402         struct flowi fl;
1403         struct dst_entry *dst;
1404
1405         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1406
1407         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1408         mldlen = skb->tail - skb->transport_header;
1409         pip6->payload_len = htons(payload_len);
1410
1411         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1412                                            IPPROTO_ICMPV6,
1413                                            csum_partial(skb_transport_header(skb),
1414                                                         mldlen, 0));
1415
1416         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1417
1418         if (!dst) {
1419                 err = -ENOMEM;
1420                 goto err_out;
1421         }
1422
1423         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1424                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1425                          skb->dev->ifindex);
1426
1427         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1428         skb_dst_set(skb, dst);
1429         if (err)
1430                 goto err_out;
1431
1432         payload_len = skb->len;
1433
1434         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1435                       dst_output);
1436 out:
1437         if (!err) {
1438                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1439                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1440                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1441         } else
1442                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1443
1444         if (likely(idev != NULL))
1445                 in6_dev_put(idev);
1446         return;
1447
1448 err_out:
1449         kfree_skb(skb);
1450         goto out;
1451 }
1452
1453 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1454 {
1455         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1456 }
1457
1458 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1459         int type, struct mld2_grec **ppgr)
1460 {
1461         struct net_device *dev = pmc->idev->dev;
1462         struct mld2_report *pmr;
1463         struct mld2_grec *pgr;
1464
1465         if (!skb)
1466                 skb = mld_newpack(dev, dev->mtu);
1467         if (!skb)
1468                 return NULL;
1469         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1470         pgr->grec_type = type;
1471         pgr->grec_auxwords = 0;
1472         pgr->grec_nsrcs = 0;
1473         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1474         pmr = (struct mld2_report *)skb_transport_header(skb);
1475         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1476         *ppgr = pgr;
1477         return skb;
1478 }
1479
1480 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1481         skb_tailroom(skb)) : 0)
1482
1483 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1484         int type, int gdeleted, int sdeleted)
1485 {
1486         struct net_device *dev = pmc->idev->dev;
1487         struct mld2_report *pmr;
1488         struct mld2_grec *pgr = NULL;
1489         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1490         int scount, stotal, first, isquery, truncate;
1491
1492         if (pmc->mca_flags & MAF_NOREPORT)
1493                 return skb;
1494
1495         isquery = type == MLD2_MODE_IS_INCLUDE ||
1496                   type == MLD2_MODE_IS_EXCLUDE;
1497         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1498                     type == MLD2_CHANGE_TO_EXCLUDE;
1499
1500         stotal = scount = 0;
1501
1502         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1503
1504         if (!*psf_list)
1505                 goto empty_source;
1506
1507         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1508
1509         /* EX and TO_EX get a fresh packet, if needed */
1510         if (truncate) {
1511                 if (pmr && pmr->mld2r_ngrec &&
1512                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1513                         if (skb)
1514                                 mld_sendpack(skb);
1515                         skb = mld_newpack(dev, dev->mtu);
1516                 }
1517         }
1518         first = 1;
1519         psf_prev = NULL;
1520         for (psf=*psf_list; psf; psf=psf_next) {
1521                 struct in6_addr *psrc;
1522
1523                 psf_next = psf->sf_next;
1524
1525                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1526                         psf_prev = psf;
1527                         continue;
1528                 }
1529
1530                 /* clear marks on query responses */
1531                 if (isquery)
1532                         psf->sf_gsresp = 0;
1533
1534                 if (AVAILABLE(skb) < sizeof(*psrc) +
1535                     first*sizeof(struct mld2_grec)) {
1536                         if (truncate && !first)
1537                                 break;   /* truncate these */
1538                         if (pgr)
1539                                 pgr->grec_nsrcs = htons(scount);
1540                         if (skb)
1541                                 mld_sendpack(skb);
1542                         skb = mld_newpack(dev, dev->mtu);
1543                         first = 1;
1544                         scount = 0;
1545                 }
1546                 if (first) {
1547                         skb = add_grhead(skb, pmc, type, &pgr);
1548                         first = 0;
1549                 }
1550                 if (!skb)
1551                         return NULL;
1552                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1553                 *psrc = psf->sf_addr;
1554                 scount++; stotal++;
1555                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1556                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1557                         psf->sf_crcount--;
1558                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1559                                 if (psf_prev)
1560                                         psf_prev->sf_next = psf->sf_next;
1561                                 else
1562                                         *psf_list = psf->sf_next;
1563                                 kfree(psf);
1564                                 continue;
1565                         }
1566                 }
1567                 psf_prev = psf;
1568         }
1569
1570 empty_source:
1571         if (!stotal) {
1572                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1573                     type == MLD2_BLOCK_OLD_SOURCES)
1574                         return skb;
1575                 if (pmc->mca_crcount || isquery) {
1576                         /* make sure we have room for group header */
1577                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1578                                 mld_sendpack(skb);
1579                                 skb = NULL; /* add_grhead will get a new one */
1580                         }
1581                         skb = add_grhead(skb, pmc, type, &pgr);
1582                 }
1583         }
1584         if (pgr)
1585                 pgr->grec_nsrcs = htons(scount);
1586
1587         if (isquery)
1588                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1589         return skb;
1590 }
1591
1592 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1593 {
1594         struct sk_buff *skb = NULL;
1595         int type;
1596
1597         if (!pmc) {
1598                 read_lock_bh(&idev->lock);
1599                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1600                         if (pmc->mca_flags & MAF_NOREPORT)
1601                                 continue;
1602                         spin_lock_bh(&pmc->mca_lock);
1603                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1604                                 type = MLD2_MODE_IS_EXCLUDE;
1605                         else
1606                                 type = MLD2_MODE_IS_INCLUDE;
1607                         skb = add_grec(skb, pmc, type, 0, 0);
1608                         spin_unlock_bh(&pmc->mca_lock);
1609                 }
1610                 read_unlock_bh(&idev->lock);
1611         } else {
1612                 spin_lock_bh(&pmc->mca_lock);
1613                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1614                         type = MLD2_MODE_IS_EXCLUDE;
1615                 else
1616                         type = MLD2_MODE_IS_INCLUDE;
1617                 skb = add_grec(skb, pmc, type, 0, 0);
1618                 spin_unlock_bh(&pmc->mca_lock);
1619         }
1620         if (skb)
1621                 mld_sendpack(skb);
1622 }
1623
1624 /*
1625  * remove zero-count source records from a source filter list
1626  */
1627 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1628 {
1629         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1630
1631         psf_prev = NULL;
1632         for (psf=*ppsf; psf; psf = psf_next) {
1633                 psf_next = psf->sf_next;
1634                 if (psf->sf_crcount == 0) {
1635                         if (psf_prev)
1636                                 psf_prev->sf_next = psf->sf_next;
1637                         else
1638                                 *ppsf = psf->sf_next;
1639                         kfree(psf);
1640                 } else
1641                         psf_prev = psf;
1642         }
1643 }
1644
1645 static void mld_send_cr(struct inet6_dev *idev)
1646 {
1647         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1648         struct sk_buff *skb = NULL;
1649         int type, dtype;
1650
1651         read_lock_bh(&idev->lock);
1652         spin_lock(&idev->mc_lock);
1653
1654         /* deleted MCA's */
1655         pmc_prev = NULL;
1656         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1657                 pmc_next = pmc->next;
1658                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1659                         type = MLD2_BLOCK_OLD_SOURCES;
1660                         dtype = MLD2_BLOCK_OLD_SOURCES;
1661                         skb = add_grec(skb, pmc, type, 1, 0);
1662                         skb = add_grec(skb, pmc, dtype, 1, 1);
1663                 }
1664                 if (pmc->mca_crcount) {
1665                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1666                                 type = MLD2_CHANGE_TO_INCLUDE;
1667                                 skb = add_grec(skb, pmc, type, 1, 0);
1668                         }
1669                         pmc->mca_crcount--;
1670                         if (pmc->mca_crcount == 0) {
1671                                 mld_clear_zeros(&pmc->mca_tomb);
1672                                 mld_clear_zeros(&pmc->mca_sources);
1673                         }
1674                 }
1675                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1676                     !pmc->mca_sources) {
1677                         if (pmc_prev)
1678                                 pmc_prev->next = pmc_next;
1679                         else
1680                                 idev->mc_tomb = pmc_next;
1681                         in6_dev_put(pmc->idev);
1682                         kfree(pmc);
1683                 } else
1684                         pmc_prev = pmc;
1685         }
1686         spin_unlock(&idev->mc_lock);
1687
1688         /* change recs */
1689         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1690                 spin_lock_bh(&pmc->mca_lock);
1691                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1692                         type = MLD2_BLOCK_OLD_SOURCES;
1693                         dtype = MLD2_ALLOW_NEW_SOURCES;
1694                 } else {
1695                         type = MLD2_ALLOW_NEW_SOURCES;
1696                         dtype = MLD2_BLOCK_OLD_SOURCES;
1697                 }
1698                 skb = add_grec(skb, pmc, type, 0, 0);
1699                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1700
1701                 /* filter mode changes */
1702                 if (pmc->mca_crcount) {
1703                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1704                                 type = MLD2_CHANGE_TO_EXCLUDE;
1705                         else
1706                                 type = MLD2_CHANGE_TO_INCLUDE;
1707                         skb = add_grec(skb, pmc, type, 0, 0);
1708                         pmc->mca_crcount--;
1709                 }
1710                 spin_unlock_bh(&pmc->mca_lock);
1711         }
1712         read_unlock_bh(&idev->lock);
1713         if (!skb)
1714                 return;
1715         (void) mld_sendpack(skb);
1716 }
1717
1718 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1719 {
1720         struct net *net = dev_net(dev);
1721         struct sock *sk = net->ipv6.igmp_sk;
1722         struct inet6_dev *idev;
1723         struct sk_buff *skb;
1724         struct mld_msg *hdr;
1725         const struct in6_addr *snd_addr, *saddr;
1726         struct in6_addr addr_buf;
1727         int err, len, payload_len, full_len;
1728         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1729                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1730                      IPV6_TLV_PADN, 0 };
1731         struct flowi fl;
1732         struct dst_entry *dst;
1733
1734         if (type == ICMPV6_MGM_REDUCTION)
1735                 snd_addr = &in6addr_linklocal_allrouters;
1736         else
1737                 snd_addr = addr;
1738
1739         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1740         payload_len = len + sizeof(ra);
1741         full_len = sizeof(struct ipv6hdr) + payload_len;
1742
1743         rcu_read_lock();
1744         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1745                       IPSTATS_MIB_OUT, full_len);
1746         rcu_read_unlock();
1747
1748         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1749
1750         if (skb == NULL) {
1751                 rcu_read_lock();
1752                 IP6_INC_STATS(net, __in6_dev_get(dev),
1753                               IPSTATS_MIB_OUTDISCARDS);
1754                 rcu_read_unlock();
1755                 return;
1756         }
1757
1758         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1759
1760         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1761                 /* <draft-ietf-magma-mld-source-05.txt>:
1762                  * use unspecified address as the source address
1763                  * when a valid link-local address is not available.
1764                  */
1765                 saddr = &in6addr_any;
1766         } else
1767                 saddr = &addr_buf;
1768
1769         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1770
1771         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1772
1773         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1774         memset(hdr, 0, sizeof(struct mld_msg));
1775         hdr->mld_type = type;
1776         ipv6_addr_copy(&hdr->mld_mca, addr);
1777
1778         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1779                                          IPPROTO_ICMPV6,
1780                                          csum_partial(hdr, len, 0));
1781
1782         idev = in6_dev_get(skb->dev);
1783
1784         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1785         if (!dst) {
1786                 err = -ENOMEM;
1787                 goto err_out;
1788         }
1789
1790         icmpv6_flow_init(sk, &fl, type,
1791                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1792                          skb->dev->ifindex);
1793
1794         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1795         if (err)
1796                 goto err_out;
1797
1798         skb_dst_set(skb, dst);
1799         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1800                       dst_output);
1801 out:
1802         if (!err) {
1803                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1804                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1805                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1806         } else
1807                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1808
1809         if (likely(idev != NULL))
1810                 in6_dev_put(idev);
1811         return;
1812
1813 err_out:
1814         kfree_skb(skb);
1815         goto out;
1816 }
1817
1818 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1819         struct in6_addr *psfsrc)
1820 {
1821         struct ip6_sf_list *psf, *psf_prev;
1822         int rv = 0;
1823
1824         psf_prev = NULL;
1825         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1826                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1827                         break;
1828                 psf_prev = psf;
1829         }
1830         if (!psf || psf->sf_count[sfmode] == 0) {
1831                 /* source filter not found, or count wrong =>  bug */
1832                 return -ESRCH;
1833         }
1834         psf->sf_count[sfmode]--;
1835         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1836                 struct inet6_dev *idev = pmc->idev;
1837
1838                 /* no more filters for this source */
1839                 if (psf_prev)
1840                         psf_prev->sf_next = psf->sf_next;
1841                 else
1842                         pmc->mca_sources = psf->sf_next;
1843                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1844                     !MLD_V1_SEEN(idev)) {
1845                         psf->sf_crcount = idev->mc_qrv;
1846                         psf->sf_next = pmc->mca_tomb;
1847                         pmc->mca_tomb = psf;
1848                         rv = 1;
1849                 } else
1850                         kfree(psf);
1851         }
1852         return rv;
1853 }
1854
1855 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1856                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1857                           int delta)
1858 {
1859         struct ifmcaddr6 *pmc;
1860         int     changerec = 0;
1861         int     i, err;
1862
1863         if (!idev)
1864                 return -ENODEV;
1865         read_lock_bh(&idev->lock);
1866         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1867                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1868                         break;
1869         }
1870         if (!pmc) {
1871                 /* MCA not found?? bug */
1872                 read_unlock_bh(&idev->lock);
1873                 return -ESRCH;
1874         }
1875         spin_lock_bh(&pmc->mca_lock);
1876         sf_markstate(pmc);
1877         if (!delta) {
1878                 if (!pmc->mca_sfcount[sfmode]) {
1879                         spin_unlock_bh(&pmc->mca_lock);
1880                         read_unlock_bh(&idev->lock);
1881                         return -EINVAL;
1882                 }
1883                 pmc->mca_sfcount[sfmode]--;
1884         }
1885         err = 0;
1886         for (i=0; i<sfcount; i++) {
1887                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1888
1889                 changerec |= rv > 0;
1890                 if (!err && rv < 0)
1891                         err = rv;
1892         }
1893         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1894             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1895             pmc->mca_sfcount[MCAST_INCLUDE]) {
1896                 struct ip6_sf_list *psf;
1897
1898                 /* filter mode change */
1899                 pmc->mca_sfmode = MCAST_INCLUDE;
1900                 pmc->mca_crcount = idev->mc_qrv;
1901                 idev->mc_ifc_count = pmc->mca_crcount;
1902                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1903                         psf->sf_crcount = 0;
1904                 mld_ifc_event(pmc->idev);
1905         } else if (sf_setstate(pmc) || changerec)
1906                 mld_ifc_event(pmc->idev);
1907         spin_unlock_bh(&pmc->mca_lock);
1908         read_unlock_bh(&idev->lock);
1909         return err;
1910 }
1911
1912 /*
1913  * Add multicast single-source filter to the interface list
1914  */
1915 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1916         struct in6_addr *psfsrc, int delta)
1917 {
1918         struct ip6_sf_list *psf, *psf_prev;
1919
1920         psf_prev = NULL;
1921         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1922                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1923                         break;
1924                 psf_prev = psf;
1925         }
1926         if (!psf) {
1927                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1928                 if (!psf)
1929                         return -ENOBUFS;
1930
1931                 psf->sf_addr = *psfsrc;
1932                 if (psf_prev) {
1933                         psf_prev->sf_next = psf;
1934                 } else
1935                         pmc->mca_sources = psf;
1936         }
1937         psf->sf_count[sfmode]++;
1938         return 0;
1939 }
1940
1941 static void sf_markstate(struct ifmcaddr6 *pmc)
1942 {
1943         struct ip6_sf_list *psf;
1944         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1945
1946         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1947                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1948                         psf->sf_oldin = mca_xcount ==
1949                                 psf->sf_count[MCAST_EXCLUDE] &&
1950                                 !psf->sf_count[MCAST_INCLUDE];
1951                 } else
1952                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1953 }
1954
1955 static int sf_setstate(struct ifmcaddr6 *pmc)
1956 {
1957         struct ip6_sf_list *psf, *dpsf;
1958         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1959         int qrv = pmc->idev->mc_qrv;
1960         int new_in, rv;
1961
1962         rv = 0;
1963         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1964                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1965                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1966                                 !psf->sf_count[MCAST_INCLUDE];
1967                 } else
1968                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1969                 if (new_in) {
1970                         if (!psf->sf_oldin) {
1971                                 struct ip6_sf_list *prev = NULL;
1972
1973                                 for (dpsf=pmc->mca_tomb; dpsf;
1974                                      dpsf=dpsf->sf_next) {
1975                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1976                                             &psf->sf_addr))
1977                                                 break;
1978                                         prev = dpsf;
1979                                 }
1980                                 if (dpsf) {
1981                                         if (prev)
1982                                                 prev->sf_next = dpsf->sf_next;
1983                                         else
1984                                                 pmc->mca_tomb = dpsf->sf_next;
1985                                         kfree(dpsf);
1986                                 }
1987                                 psf->sf_crcount = qrv;
1988                                 rv++;
1989                         }
1990                 } else if (psf->sf_oldin) {
1991                         psf->sf_crcount = 0;
1992                         /*
1993                          * add or update "delete" records if an active filter
1994                          * is now inactive
1995                          */
1996                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1997                                 if (ipv6_addr_equal(&dpsf->sf_addr,
1998                                     &psf->sf_addr))
1999                                         break;
2000                         if (!dpsf) {
2001                                 dpsf = (struct ip6_sf_list *)
2002                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2003                                 if (!dpsf)
2004                                         continue;
2005                                 *dpsf = *psf;
2006                                 /* pmc->mca_lock held by callers */
2007                                 dpsf->sf_next = pmc->mca_tomb;
2008                                 pmc->mca_tomb = dpsf;
2009                         }
2010                         dpsf->sf_crcount = qrv;
2011                         rv++;
2012                 }
2013         }
2014         return rv;
2015 }
2016
2017 /*
2018  * Add multicast source filter list to the interface list
2019  */
2020 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2021                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2022                           int delta)
2023 {
2024         struct ifmcaddr6 *pmc;
2025         int     isexclude;
2026         int     i, err;
2027
2028         if (!idev)
2029                 return -ENODEV;
2030         read_lock_bh(&idev->lock);
2031         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2032                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2033                         break;
2034         }
2035         if (!pmc) {
2036                 /* MCA not found?? bug */
2037                 read_unlock_bh(&idev->lock);
2038                 return -ESRCH;
2039         }
2040         spin_lock_bh(&pmc->mca_lock);
2041
2042         sf_markstate(pmc);
2043         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2044         if (!delta)
2045                 pmc->mca_sfcount[sfmode]++;
2046         err = 0;
2047         for (i=0; i<sfcount; i++) {
2048                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2049                 if (err)
2050                         break;
2051         }
2052         if (err) {
2053                 int j;
2054
2055                 if (!delta)
2056                         pmc->mca_sfcount[sfmode]--;
2057                 for (j=0; j<i; j++)
2058                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2059         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2060                 struct ip6_sf_list *psf;
2061
2062                 /* filter mode change */
2063                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2064                         pmc->mca_sfmode = MCAST_EXCLUDE;
2065                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2066                         pmc->mca_sfmode = MCAST_INCLUDE;
2067                 /* else no filters; keep old mode for reports */
2068
2069                 pmc->mca_crcount = idev->mc_qrv;
2070                 idev->mc_ifc_count = pmc->mca_crcount;
2071                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2072                         psf->sf_crcount = 0;
2073                 mld_ifc_event(idev);
2074         } else if (sf_setstate(pmc))
2075                 mld_ifc_event(idev);
2076         spin_unlock_bh(&pmc->mca_lock);
2077         read_unlock_bh(&idev->lock);
2078         return err;
2079 }
2080
2081 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2082 {
2083         struct ip6_sf_list *psf, *nextpsf;
2084
2085         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2086                 nextpsf = psf->sf_next;
2087                 kfree(psf);
2088         }
2089         pmc->mca_tomb = NULL;
2090         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2091                 nextpsf = psf->sf_next;
2092                 kfree(psf);
2093         }
2094         pmc->mca_sources = NULL;
2095         pmc->mca_sfmode = MCAST_EXCLUDE;
2096         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2097         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2098 }
2099
2100
2101 static void igmp6_join_group(struct ifmcaddr6 *ma)
2102 {
2103         unsigned long delay;
2104
2105         if (ma->mca_flags & MAF_NOREPORT)
2106                 return;
2107
2108         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2109
2110         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2111
2112         spin_lock_bh(&ma->mca_lock);
2113         if (del_timer(&ma->mca_timer)) {
2114                 atomic_dec(&ma->mca_refcnt);
2115                 delay = ma->mca_timer.expires - jiffies;
2116         }
2117
2118         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2119                 atomic_inc(&ma->mca_refcnt);
2120         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2121         spin_unlock_bh(&ma->mca_lock);
2122 }
2123
2124 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2125                             struct inet6_dev *idev)
2126 {
2127         int err;
2128
2129         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2130          * so no other readers or writers of iml or its sflist
2131          */
2132         if (!iml->sflist) {
2133                 /* any-source empty exclude case */
2134                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2135         }
2136         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2137                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2138         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2139         iml->sflist = NULL;
2140         return err;
2141 }
2142
2143 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2144 {
2145         if (MLD_V1_SEEN(ma->idev)) {
2146                 if (ma->mca_flags & MAF_LAST_REPORTER)
2147                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2148                                 ICMPV6_MGM_REDUCTION);
2149         } else {
2150                 mld_add_delrec(ma->idev, ma);
2151                 mld_ifc_event(ma->idev);
2152         }
2153 }
2154
2155 static void mld_gq_timer_expire(unsigned long data)
2156 {
2157         struct inet6_dev *idev = (struct inet6_dev *)data;
2158
2159         idev->mc_gq_running = 0;
2160         mld_send_report(idev, NULL);
2161         __in6_dev_put(idev);
2162 }
2163
2164 static void mld_ifc_timer_expire(unsigned long data)
2165 {
2166         struct inet6_dev *idev = (struct inet6_dev *)data;
2167
2168         mld_send_cr(idev);
2169         if (idev->mc_ifc_count) {
2170                 idev->mc_ifc_count--;
2171                 if (idev->mc_ifc_count)
2172                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2173         }
2174         __in6_dev_put(idev);
2175 }
2176
2177 static void mld_ifc_event(struct inet6_dev *idev)
2178 {
2179         if (MLD_V1_SEEN(idev))
2180                 return;
2181         idev->mc_ifc_count = idev->mc_qrv;
2182         mld_ifc_start_timer(idev, 1);
2183 }
2184
2185
2186 static void igmp6_timer_handler(unsigned long data)
2187 {
2188         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2189
2190         if (MLD_V1_SEEN(ma->idev))
2191                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2192         else
2193                 mld_send_report(ma->idev, ma);
2194
2195         spin_lock(&ma->mca_lock);
2196         ma->mca_flags |=  MAF_LAST_REPORTER;
2197         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2198         spin_unlock(&ma->mca_lock);
2199         ma_put(ma);
2200 }
2201
2202 /* Device changing type */
2203
2204 void ipv6_mc_unmap(struct inet6_dev *idev)
2205 {
2206         struct ifmcaddr6 *i;
2207
2208         /* Install multicast list, except for all-nodes (already installed) */
2209
2210         read_lock_bh(&idev->lock);
2211         for (i = idev->mc_list; i; i = i->next)
2212                 igmp6_group_dropped(i);
2213         read_unlock_bh(&idev->lock);
2214 }
2215
2216 void ipv6_mc_remap(struct inet6_dev *idev)
2217 {
2218         ipv6_mc_up(idev);
2219 }
2220
2221 /* Device going down */
2222
2223 void ipv6_mc_down(struct inet6_dev *idev)
2224 {
2225         struct ifmcaddr6 *i;
2226
2227         /* Withdraw multicast list */
2228
2229         read_lock_bh(&idev->lock);
2230         idev->mc_ifc_count = 0;
2231         if (del_timer(&idev->mc_ifc_timer))
2232                 __in6_dev_put(idev);
2233         idev->mc_gq_running = 0;
2234         if (del_timer(&idev->mc_gq_timer))
2235                 __in6_dev_put(idev);
2236
2237         for (i = idev->mc_list; i; i=i->next)
2238                 igmp6_group_dropped(i);
2239         read_unlock_bh(&idev->lock);
2240
2241         mld_clear_delrec(idev);
2242 }
2243
2244
2245 /* Device going up */
2246
2247 void ipv6_mc_up(struct inet6_dev *idev)
2248 {
2249         struct ifmcaddr6 *i;
2250
2251         /* Install multicast list, except for all-nodes (already installed) */
2252
2253         read_lock_bh(&idev->lock);
2254         for (i = idev->mc_list; i; i=i->next)
2255                 igmp6_group_added(i);
2256         read_unlock_bh(&idev->lock);
2257 }
2258
2259 /* IPv6 device initialization. */
2260
2261 void ipv6_mc_init_dev(struct inet6_dev *idev)
2262 {
2263         write_lock_bh(&idev->lock);
2264         spin_lock_init(&idev->mc_lock);
2265         idev->mc_gq_running = 0;
2266         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2267                         (unsigned long)idev);
2268         idev->mc_tomb = NULL;
2269         idev->mc_ifc_count = 0;
2270         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2271                         (unsigned long)idev);
2272         idev->mc_qrv = MLD_QRV_DEFAULT;
2273         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2274         idev->mc_v1_seen = 0;
2275         write_unlock_bh(&idev->lock);
2276 }
2277
2278 /*
2279  *      Device is about to be destroyed: clean up.
2280  */
2281
2282 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2283 {
2284         struct ifmcaddr6 *i;
2285
2286         /* Deactivate timers */
2287         ipv6_mc_down(idev);
2288
2289         /* Delete all-nodes address. */
2290         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2291          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2292          * fail.
2293          */
2294         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2295
2296         if (idev->cnf.forwarding)
2297                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2298
2299         write_lock_bh(&idev->lock);
2300         while ((i = idev->mc_list) != NULL) {
2301                 idev->mc_list = i->next;
2302                 write_unlock_bh(&idev->lock);
2303
2304                 igmp6_group_dropped(i);
2305                 ma_put(i);
2306
2307                 write_lock_bh(&idev->lock);
2308         }
2309         write_unlock_bh(&idev->lock);
2310 }
2311
2312 #ifdef CONFIG_PROC_FS
2313 struct igmp6_mc_iter_state {
2314         struct seq_net_private p;
2315         struct net_device *dev;
2316         struct inet6_dev *idev;
2317 };
2318
2319 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2320
2321 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2322 {
2323         struct ifmcaddr6 *im = NULL;
2324         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2325         struct net *net = seq_file_net(seq);
2326
2327         state->idev = NULL;
2328         for_each_netdev_rcu(net, state->dev) {
2329                 struct inet6_dev *idev;
2330                 idev = __in6_dev_get(state->dev);
2331                 if (!idev)
2332                         continue;
2333                 read_lock_bh(&idev->lock);
2334                 im = idev->mc_list;
2335                 if (im) {
2336                         state->idev = idev;
2337                         break;
2338                 }
2339                 read_unlock_bh(&idev->lock);
2340         }
2341         return im;
2342 }
2343
2344 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2345 {
2346         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2347
2348         im = im->next;
2349         while (!im) {
2350                 if (likely(state->idev != NULL))
2351                         read_unlock_bh(&state->idev->lock);
2352
2353                 state->dev = next_net_device_rcu(state->dev);
2354                 if (!state->dev) {
2355                         state->idev = NULL;
2356                         break;
2357                 }
2358                 state->idev = __in6_dev_get(state->dev);
2359                 if (!state->idev)
2360                         continue;
2361                 read_lock_bh(&state->idev->lock);
2362                 im = state->idev->mc_list;
2363         }
2364         return im;
2365 }
2366
2367 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2368 {
2369         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2370         if (im)
2371                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2372                         --pos;
2373         return pos ? NULL : im;
2374 }
2375
2376 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2377         __acquires(RCU)
2378 {
2379         rcu_read_lock();
2380         return igmp6_mc_get_idx(seq, *pos);
2381 }
2382
2383 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2384 {
2385         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2386
2387         ++*pos;
2388         return im;
2389 }
2390
2391 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2392         __releases(RCU)
2393 {
2394         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2395
2396         if (likely(state->idev != NULL)) {
2397                 read_unlock_bh(&state->idev->lock);
2398                 state->idev = NULL;
2399         }
2400         state->dev = NULL;
2401         rcu_read_unlock();
2402 }
2403
2404 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2405 {
2406         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2407         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2408
2409         seq_printf(seq,
2410                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2411                    state->dev->ifindex, state->dev->name,
2412                    &im->mca_addr,
2413                    im->mca_users, im->mca_flags,
2414                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2415                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2416         return 0;
2417 }
2418
2419 static const struct seq_operations igmp6_mc_seq_ops = {
2420         .start  =       igmp6_mc_seq_start,
2421         .next   =       igmp6_mc_seq_next,
2422         .stop   =       igmp6_mc_seq_stop,
2423         .show   =       igmp6_mc_seq_show,
2424 };
2425
2426 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2427 {
2428         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2429                             sizeof(struct igmp6_mc_iter_state));
2430 }
2431
2432 static const struct file_operations igmp6_mc_seq_fops = {
2433         .owner          =       THIS_MODULE,
2434         .open           =       igmp6_mc_seq_open,
2435         .read           =       seq_read,
2436         .llseek         =       seq_lseek,
2437         .release        =       seq_release_net,
2438 };
2439
2440 struct igmp6_mcf_iter_state {
2441         struct seq_net_private p;
2442         struct net_device *dev;
2443         struct inet6_dev *idev;
2444         struct ifmcaddr6 *im;
2445 };
2446
2447 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2448
2449 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2450 {
2451         struct ip6_sf_list *psf = NULL;
2452         struct ifmcaddr6 *im = NULL;
2453         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2454         struct net *net = seq_file_net(seq);
2455
2456         state->idev = NULL;
2457         state->im = NULL;
2458         for_each_netdev_rcu(net, state->dev) {
2459                 struct inet6_dev *idev;
2460                 idev = __in6_dev_get(state->dev);
2461                 if (unlikely(idev == NULL))
2462                         continue;
2463                 read_lock_bh(&idev->lock);
2464                 im = idev->mc_list;
2465                 if (likely(im != NULL)) {
2466                         spin_lock_bh(&im->mca_lock);
2467                         psf = im->mca_sources;
2468                         if (likely(psf != NULL)) {
2469                                 state->im = im;
2470                                 state->idev = idev;
2471                                 break;
2472                         }
2473                         spin_unlock_bh(&im->mca_lock);
2474                 }
2475                 read_unlock_bh(&idev->lock);
2476         }
2477         return psf;
2478 }
2479
2480 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2481 {
2482         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2483
2484         psf = psf->sf_next;
2485         while (!psf) {
2486                 spin_unlock_bh(&state->im->mca_lock);
2487                 state->im = state->im->next;
2488                 while (!state->im) {
2489                         if (likely(state->idev != NULL))
2490                                 read_unlock_bh(&state->idev->lock);
2491
2492                         state->dev = next_net_device_rcu(state->dev);
2493                         if (!state->dev) {
2494                                 state->idev = NULL;
2495                                 goto out;
2496                         }
2497                         state->idev = __in6_dev_get(state->dev);
2498                         if (!state->idev)
2499                                 continue;
2500                         read_lock_bh(&state->idev->lock);
2501                         state->im = state->idev->mc_list;
2502                 }
2503                 if (!state->im)
2504                         break;
2505                 spin_lock_bh(&state->im->mca_lock);
2506                 psf = state->im->mca_sources;
2507         }
2508 out:
2509         return psf;
2510 }
2511
2512 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2513 {
2514         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2515         if (psf)
2516                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2517                         --pos;
2518         return pos ? NULL : psf;
2519 }
2520
2521 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2522         __acquires(RCU)
2523 {
2524         rcu_read_lock();
2525         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2526 }
2527
2528 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2529 {
2530         struct ip6_sf_list *psf;
2531         if (v == SEQ_START_TOKEN)
2532                 psf = igmp6_mcf_get_first(seq);
2533         else
2534                 psf = igmp6_mcf_get_next(seq, v);
2535         ++*pos;
2536         return psf;
2537 }
2538
2539 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2540         __releases(RCU)
2541 {
2542         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2543         if (likely(state->im != NULL)) {
2544                 spin_unlock_bh(&state->im->mca_lock);
2545                 state->im = NULL;
2546         }
2547         if (likely(state->idev != NULL)) {
2548                 read_unlock_bh(&state->idev->lock);
2549                 state->idev = NULL;
2550         }
2551         state->dev = NULL;
2552         rcu_read_unlock();
2553 }
2554
2555 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2556 {
2557         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2558         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2559
2560         if (v == SEQ_START_TOKEN) {
2561                 seq_printf(seq,
2562                            "%3s %6s "
2563                            "%32s %32s %6s %6s\n", "Idx",
2564                            "Device", "Multicast Address",
2565                            "Source Address", "INC", "EXC");
2566         } else {
2567                 seq_printf(seq,
2568                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2569                            state->dev->ifindex, state->dev->name,
2570                            &state->im->mca_addr,
2571                            &psf->sf_addr,
2572                            psf->sf_count[MCAST_INCLUDE],
2573                            psf->sf_count[MCAST_EXCLUDE]);
2574         }
2575         return 0;
2576 }
2577
2578 static const struct seq_operations igmp6_mcf_seq_ops = {
2579         .start  =       igmp6_mcf_seq_start,
2580         .next   =       igmp6_mcf_seq_next,
2581         .stop   =       igmp6_mcf_seq_stop,
2582         .show   =       igmp6_mcf_seq_show,
2583 };
2584
2585 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2586 {
2587         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2588                             sizeof(struct igmp6_mcf_iter_state));
2589 }
2590
2591 static const struct file_operations igmp6_mcf_seq_fops = {
2592         .owner          =       THIS_MODULE,
2593         .open           =       igmp6_mcf_seq_open,
2594         .read           =       seq_read,
2595         .llseek         =       seq_lseek,
2596         .release        =       seq_release_net,
2597 };
2598
2599 static int __net_init igmp6_proc_init(struct net *net)
2600 {
2601         int err;
2602
2603         err = -ENOMEM;
2604         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2605                 goto out;
2606         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2607                                   &igmp6_mcf_seq_fops))
2608                 goto out_proc_net_igmp6;
2609
2610         err = 0;
2611 out:
2612         return err;
2613
2614 out_proc_net_igmp6:
2615         proc_net_remove(net, "igmp6");
2616         goto out;
2617 }
2618
2619 static void __net_exit igmp6_proc_exit(struct net *net)
2620 {
2621         proc_net_remove(net, "mcfilter6");
2622         proc_net_remove(net, "igmp6");
2623 }
2624 #else
2625 static inline int igmp6_proc_init(struct net *net)
2626 {
2627         return 0;
2628 }
2629 static inline void igmp6_proc_exit(struct net *net)
2630 {
2631 }
2632 #endif
2633
2634 static int __net_init igmp6_net_init(struct net *net)
2635 {
2636         int err;
2637
2638         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2639                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2640         if (err < 0) {
2641                 printk(KERN_ERR
2642                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2643                        err);
2644                 goto out;
2645         }
2646
2647         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2648
2649         err = igmp6_proc_init(net);
2650         if (err)
2651                 goto out_sock_create;
2652 out:
2653         return err;
2654
2655 out_sock_create:
2656         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2657         goto out;
2658 }
2659
2660 static void __net_exit igmp6_net_exit(struct net *net)
2661 {
2662         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2663         igmp6_proc_exit(net);
2664 }
2665
2666 static struct pernet_operations igmp6_net_ops = {
2667         .init = igmp6_net_init,
2668         .exit = igmp6_net_exit,
2669 };
2670
2671 int __init igmp6_init(void)
2672 {
2673         return register_pernet_subsys(&igmp6_net_ops);
2674 }
2675
2676 void igmp6_cleanup(void)
2677 {
2678         unregister_pernet_subsys(&igmp6_net_ops);
2679 }