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
  48 #include <linux/netfilter.h>
  49 #include <linux/netfilter_ipv6.h>
  50
  51 #include <net/net_namespace.h>
  52 #include <net/sock.h>
  53 #include <net/snmp.h>
  54
  55 #include <net/ipv6.h>
  56 #include <net/protocol.h>
  57 #include <net/if_inet6.h>
  58 #include <net/ndisc.h>
  59 #include <net/addrconf.h>
  60 #include <net/ip6_route.h>
  61 #include <net/inet_common.h>
  62
  63 #include <net/ip6_checksum.h>
  64
  65 /* Set to 3 to get tracing... */
  66 #define MCAST_DEBUG 2
  67
  68 #if MCAST_DEBUG >= 3
  69 #define MDBG(x) printk x
  70 #else
  71 #define MDBG(x)
  72 #endif
  73
  74 /*
  75  *  These header formats should be in a separate include file, but icmpv6.h
  76  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
  77  *  other files reference these.
  78  *
  79  *                      +-DLS 4/14/03
  80  */
  81
  82 /* Multicast Listener Discovery version 2 headers */
  83
  84 struct mld2_grec {
  85         __u8            grec_type;
  86         __u8            grec_auxwords;
  87         __be16          grec_nsrcs;
  88         struct in6_addr grec_mca;
  89         struct in6_addr grec_src[0];
  90 };
  91
  92 struct mld2_report {
  93         __u8    type;
  94         __u8    resv1;
  95         __sum16 csum;
  96         __be16  resv2;
  97         __be16  ngrec;
  98         struct mld2_grec grec[0];
  99 };
 100
 101 struct mld2_query {
 102         __u8 type;
 103         __u8 code;
 104         __sum16 csum;
 105         __be16 mrc;
 106         __be16 resv1;
 107         struct in6_addr mca;
 108 #if defined(__LITTLE_ENDIAN_BITFIELD)
 109         __u8 qrv:3,
 110              suppress:1,
 111              resv2:4;
 112 #elif defined(__BIG_ENDIAN_BITFIELD)
 113         __u8 resv2:4,
 114              suppress:1,
 115              qrv:3;
 116 #else
 117 #error "Please fix <asm/byteorder.h>"
 118 #endif
 119         __u8 qqic;
 120         __be16 nsrcs;
 121         struct in6_addr srcs[0];
 122 };
 123
 124 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 125
 126 /* Big mc list lock for all the sockets */
 127 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
 128
 129 static void igmp6_join_group(struct ifmcaddr6 *ma);
 130 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 131 static void igmp6_timer_handler(unsigned long data);
 132
 133 static void mld_gq_timer_expire(unsigned long data);
 134 static void mld_ifc_timer_expire(unsigned long data);
 135 static void mld_ifc_event(struct inet6_dev *idev);
 136 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 137 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 138 static void mld_clear_delrec(struct inet6_dev *idev);
 139 static int sf_setstate(struct ifmcaddr6 *pmc);
 140 static void sf_markstate(struct ifmcaddr6 *pmc);
 141 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 142 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 143                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 144                           int delta);
 145 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 146                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 147                           int delta);
 148 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 149                             struct inet6_dev *idev);
 150
 151
 152 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 153 #define MLD_QRV_DEFAULT         2
 154
 155 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 156                 (idev)->cnf.force_mld_version == 1 || \
 157                 ((idev)->mc_v1_seen && \
 158                 time_before(jiffies, (idev)->mc_v1_seen)))
 159
 160 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 161 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 162         ((value) < (thresh) ? (value) : \
 163         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
 164         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 165
 166 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 167
 168 #define IPV6_MLD_MAX_MSF        64
 169
 170 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 171
 172 /*
 173  *      socket join on multicast group
 174  */
 175
 176 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 177 {
 178         struct net_device *dev = NULL;
 179         struct ipv6_mc_socklist *mc_lst;
 180         struct ipv6_pinfo *np = inet6_sk(sk);
 181         struct net *net = sock_net(sk);
 182         int err;
 183
 184         if (!ipv6_addr_is_multicast(addr))
 185                 return -EINVAL;
 186
 187         read_lock_bh(&ipv6_sk_mc_lock);
 188         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 189                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 190                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 191                         read_unlock_bh(&ipv6_sk_mc_lock);
 192                         return -EADDRINUSE;
 193                 }
 194         }
 195         read_unlock_bh(&ipv6_sk_mc_lock);
 196
 197         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 198
 199         if (mc_lst == NULL)
 200                 return -ENOMEM;
 201
 202         mc_lst->next = NULL;
 203         ipv6_addr_copy(&mc_lst->addr, addr);
 204
 205         if (ifindex == 0) {
 206                 struct rt6_info *rt;
 207                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 208                 if (rt) {
 209                         dev = rt->rt6i_dev;
 210                         dev_hold(dev);
 211                         dst_release(&rt->u.dst);
 212                 }
 213         } else
 214                 dev = dev_get_by_index(net, ifindex);
 215
 216         if (dev == NULL) {
 217                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 218                 return -ENODEV;
 219         }
 220
 221         mc_lst->ifindex = dev->ifindex;
 222         mc_lst->sfmode = MCAST_EXCLUDE;
 223         rwlock_init(&mc_lst->sflock);
 224         mc_lst->sflist = NULL;
 225
 226         /*
 227          *      now add/increase the group membership on the device
 228          */
 229
 230         err = ipv6_dev_mc_inc(dev, addr);
 231
 232         if (err) {
 233                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 234                 dev_put(dev);
 235                 return err;
 236         }
 237
 238         write_lock_bh(&ipv6_sk_mc_lock);
 239         mc_lst->next = np->ipv6_mc_list;
 240         np->ipv6_mc_list = mc_lst;
 241         write_unlock_bh(&ipv6_sk_mc_lock);
 242
 243         dev_put(dev);
 244
 245         return 0;
 246 }
 247
 248 /*
 249  *      socket leave on multicast group
 250  */
 251 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 252 {
 253         struct ipv6_pinfo *np = inet6_sk(sk);
 254         struct ipv6_mc_socklist *mc_lst, **lnk;
 255         struct net *net = sock_net(sk);
 256
 257         write_lock_bh(&ipv6_sk_mc_lock);
 258         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 259                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 260                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 261                         struct net_device *dev;
 262
 263                         *lnk = mc_lst->next;
 264                         write_unlock_bh(&ipv6_sk_mc_lock);
 265
 266                         dev = dev_get_by_index(net, mc_lst->ifindex);
 267                         if (dev != NULL) {
 268                                 struct inet6_dev *idev = in6_dev_get(dev);
 269
 270                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 271                                 if (idev) {
 272                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 273                                         in6_dev_put(idev);
 274                                 }
 275                                 dev_put(dev);
 276                         } else
 277                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 278                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 279                         return 0;
 280                 }
 281         }
 282         write_unlock_bh(&ipv6_sk_mc_lock);
 283
 284         return -EADDRNOTAVAIL;
 285 }
 286
 287 static struct inet6_dev *ip6_mc_find_dev(struct net *net,
 288                                          struct in6_addr *group,
 289                                          int ifindex)
 290 {
 291         struct net_device *dev = NULL;
 292         struct inet6_dev *idev = NULL;
 293
 294         if (ifindex == 0) {
 295                 struct rt6_info *rt;
 296
 297                 rt = rt6_lookup(net, group, NULL, 0, 0);
 298                 if (rt) {
 299                         dev = rt->rt6i_dev;
 300                         dev_hold(dev);
 301                         dst_release(&rt->u.dst);
 302                 }
 303         } else
 304                 dev = dev_get_by_index(net, ifindex);
 305
 306         if (!dev)
 307                 goto nodev;
 308         idev = in6_dev_get(dev);
 309         if (!idev)
 310                 goto release;
 311         read_lock_bh(&idev->lock);
 312         if (idev->dead)
 313                 goto unlock_release;
 314
 315         return idev;
 316
 317 unlock_release:
 318         read_unlock_bh(&idev->lock);
 319         in6_dev_put(idev);
 320 release:
 321         dev_put(dev);
 322 nodev:
 323         return NULL;
 324 }
 325
 326 void ipv6_sock_mc_close(struct sock *sk)
 327 {
 328         struct ipv6_pinfo *np = inet6_sk(sk);
 329         struct ipv6_mc_socklist *mc_lst;
 330         struct net *net = sock_net(sk);
 331
 332         write_lock_bh(&ipv6_sk_mc_lock);
 333         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 334                 struct net_device *dev;
 335
 336                 np->ipv6_mc_list = mc_lst->next;
 337                 write_unlock_bh(&ipv6_sk_mc_lock);
 338
 339                 dev = dev_get_by_index(net, mc_lst->ifindex);
 340                 if (dev) {
 341                         struct inet6_dev *idev = in6_dev_get(dev);
 342
 343                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 344                         if (idev) {
 345                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 346                                 in6_dev_put(idev);
 347                         }
 348                         dev_put(dev);
 349                 } else
 350                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 351
 352                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 353
 354                 write_lock_bh(&ipv6_sk_mc_lock);
 355         }
 356         write_unlock_bh(&ipv6_sk_mc_lock);
 357 }
 358
 359 int ip6_mc_source(int add, int omode, struct sock *sk,
 360         struct group_source_req *pgsr)
 361 {
 362         struct in6_addr *source, *group;
 363         struct ipv6_mc_socklist *pmc;
 364         struct net_device *dev;
 365         struct inet6_dev *idev;
 366         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 367         struct ip6_sf_socklist *psl;
 368         struct net *net = sock_net(sk);
 369         int i, j, rv;
 370         int leavegroup = 0;
 371         int pmclocked = 0;
 372         int err;
 373
 374         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 375         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 376
 377         if (!ipv6_addr_is_multicast(group))
 378                 return -EINVAL;
 379
 380         idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 381         if (!idev)
 382                 return -ENODEV;
 383         dev = idev->dev;
 384
 385         err = -EADDRNOTAVAIL;
 386
 387         read_lock_bh(&ipv6_sk_mc_lock);
 388         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 389                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 390                         continue;
 391                 if (ipv6_addr_equal(&pmc->addr, group))
 392                         break;
 393         }
 394         if (!pmc) {             /* must have a prior join */
 395                 err = -EINVAL;
 396                 goto done;
 397         }
 398         /* if a source filter was set, must be the same mode as before */
 399         if (pmc->sflist) {
 400                 if (pmc->sfmode != omode) {
 401                         err = -EINVAL;
 402                         goto done;
 403                 }
 404         } else if (pmc->sfmode != omode) {
 405                 /* allow mode switches for empty-set filters */
 406                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 407                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 408                 pmc->sfmode = omode;
 409         }
 410
 411         write_lock_bh(&pmc->sflock);
 412         pmclocked = 1;
 413
 414         psl = pmc->sflist;
 415         if (!add) {
 416                 if (!psl)
 417                         goto done;      /* err = -EADDRNOTAVAIL */
 418                 rv = !0;
 419                 for (i=0; i<psl->sl_count; i++) {
 420                         rv = memcmp(&psl->sl_addr[i], source,
 421                                 sizeof(struct in6_addr));
 422                         if (rv == 0)
 423                                 break;
 424                 }
 425                 if (rv)         /* source not found */
 426                         goto done;      /* err = -EADDRNOTAVAIL */
 427
 428                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 429                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 430                         leavegroup = 1;
 431                         goto done;
 432                 }
 433
 434                 /* update the interface filter */
 435                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 436
 437                 for (j=i+1; j<psl->sl_count; j++)
 438                         psl->sl_addr[j-1] = psl->sl_addr[j];
 439                 psl->sl_count--;
 440                 err = 0;
 441                 goto done;
 442         }
 443         /* else, add a new source to the filter */
 444
 445         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 446                 err = -ENOBUFS;
 447                 goto done;
 448         }
 449         if (!psl || psl->sl_count == psl->sl_max) {
 450                 struct ip6_sf_socklist *newpsl;
 451                 int count = IP6_SFBLOCK;
 452
 453                 if (psl)
 454                         count += psl->sl_max;
 455                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 456                 if (!newpsl) {
 457                         err = -ENOBUFS;
 458                         goto done;
 459                 }
 460                 newpsl->sl_max = count;
 461                 newpsl->sl_count = count - IP6_SFBLOCK;
 462                 if (psl) {
 463                         for (i=0; i<psl->sl_count; i++)
 464                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 465                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 466                 }
 467                 pmc->sflist = psl = newpsl;
 468         }
 469         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 470         for (i=0; i<psl->sl_count; i++) {
 471                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 472                 if (rv == 0)
 473                         break;
 474         }
 475         if (rv == 0)            /* address already there is an error */
 476                 goto done;
 477         for (j=psl->sl_count-1; j>=i; j--)
 478                 psl->sl_addr[j+1] = psl->sl_addr[j];
 479         psl->sl_addr[i] = *source;
 480         psl->sl_count++;
 481         err = 0;
 482         /* update the interface list */
 483         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 484 done:
 485         if (pmclocked)
 486                 write_unlock_bh(&pmc->sflock);
 487         read_unlock_bh(&ipv6_sk_mc_lock);
 488         read_unlock_bh(&idev->lock);
 489         in6_dev_put(idev);
 490         dev_put(dev);
 491         if (leavegroup)
 492                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 493         return err;
 494 }
 495
 496 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 497 {
 498         struct in6_addr *group;
 499         struct ipv6_mc_socklist *pmc;
 500         struct net_device *dev;
 501         struct inet6_dev *idev;
 502         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 503         struct ip6_sf_socklist *newpsl, *psl;
 504         struct net *net = sock_net(sk);
 505         int leavegroup = 0;
 506         int i, err;
 507
 508         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 509
 510         if (!ipv6_addr_is_multicast(group))
 511                 return -EINVAL;
 512         if (gsf->gf_fmode != MCAST_INCLUDE &&
 513             gsf->gf_fmode != MCAST_EXCLUDE)
 514                 return -EINVAL;
 515
 516         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 517
 518         if (!idev)
 519                 return -ENODEV;
 520         dev = idev->dev;
 521
 522         err = 0;
 523         read_lock_bh(&ipv6_sk_mc_lock);
 524
 525         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 526                 leavegroup = 1;
 527                 goto done;
 528         }
 529
 530         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 531                 if (pmc->ifindex != gsf->gf_interface)
 532                         continue;
 533                 if (ipv6_addr_equal(&pmc->addr, group))
 534                         break;
 535         }
 536         if (!pmc) {             /* must have a prior join */
 537                 err = -EINVAL;
 538                 goto done;
 539         }
 540         if (gsf->gf_numsrc) {
 541                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 542                                                           GFP_ATOMIC);
 543                 if (!newpsl) {
 544                         err = -ENOBUFS;
 545                         goto done;
 546                 }
 547                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 548                 for (i=0; i<newpsl->sl_count; ++i) {
 549                         struct sockaddr_in6 *psin6;
 550
 551                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 552                         newpsl->sl_addr[i] = psin6->sin6_addr;
 553                 }
 554                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 555                         newpsl->sl_count, newpsl->sl_addr, 0);
 556                 if (err) {
 557                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 558                         goto done;
 559                 }
 560         } else {
 561                 newpsl = NULL;
 562                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 563         }
 564
 565         write_lock_bh(&pmc->sflock);
 566         psl = pmc->sflist;
 567         if (psl) {
 568                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 569                         psl->sl_count, psl->sl_addr, 0);
 570                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 571         } else
 572                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 573         pmc->sflist = newpsl;
 574         pmc->sfmode = gsf->gf_fmode;
 575         write_unlock_bh(&pmc->sflock);
 576         err = 0;
 577 done:
 578         read_unlock_bh(&ipv6_sk_mc_lock);
 579         read_unlock_bh(&idev->lock);
 580         in6_dev_put(idev);
 581         dev_put(dev);
 582         if (leavegroup)
 583                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 584         return err;
 585 }
 586
 587 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 588         struct group_filter __user *optval, int __user *optlen)
 589 {
 590         int err, i, count, copycount;
 591         struct in6_addr *group;
 592         struct ipv6_mc_socklist *pmc;
 593         struct inet6_dev *idev;
 594         struct net_device *dev;
 595         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 596         struct ip6_sf_socklist *psl;
 597         struct net *net = sock_net(sk);
 598
 599         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 600
 601         if (!ipv6_addr_is_multicast(group))
 602                 return -EINVAL;
 603
 604         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 605
 606         if (!idev)
 607                 return -ENODEV;
 608
 609         dev = idev->dev;
 610
 611         err = -EADDRNOTAVAIL;
 612         /*
 613          * changes to the ipv6_mc_list require the socket lock and
 614          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 615          * so reading the list is safe.
 616          */
 617
 618         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 619                 if (pmc->ifindex != gsf->gf_interface)
 620                         continue;
 621                 if (ipv6_addr_equal(group, &pmc->addr))
 622                         break;
 623         }
 624         if (!pmc)               /* must have a prior join */
 625                 goto done;
 626         gsf->gf_fmode = pmc->sfmode;
 627         psl = pmc->sflist;
 628         count = psl ? psl->sl_count : 0;
 629         read_unlock_bh(&idev->lock);
 630         in6_dev_put(idev);
 631         dev_put(dev);
 632
 633         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 634         gsf->gf_numsrc = count;
 635         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 636             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 637                 return -EFAULT;
 638         }
 639         /* changes to psl require the socket lock, a read lock on
 640          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 641          * have the socket lock, so reading here is safe.
 642          */
 643         for (i=0; i<copycount; i++) {
 644                 struct sockaddr_in6 *psin6;
 645                 struct sockaddr_storage ss;
 646
 647                 psin6 = (struct sockaddr_in6 *)&ss;
 648                 memset(&ss, 0, sizeof(ss));
 649                 psin6->sin6_family = AF_INET6;
 650                 psin6->sin6_addr = psl->sl_addr[i];
 651                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 652                         return -EFAULT;
 653         }
 654         return 0;
 655 done:
 656         read_unlock_bh(&idev->lock);
 657         in6_dev_put(idev);
 658         dev_put(dev);
 659         return err;
 660 }
 661
 662 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 663                    const struct in6_addr *src_addr)
 664 {
 665         struct ipv6_pinfo *np = inet6_sk(sk);
 666         struct ipv6_mc_socklist *mc;
 667         struct ip6_sf_socklist *psl;
 668         int rv = 1;
 669
 670         read_lock(&ipv6_sk_mc_lock);
 671         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 672                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 673                         break;
 674         }
 675         if (!mc) {
 676                 read_unlock(&ipv6_sk_mc_lock);
 677                 return 1;
 678         }
 679         read_lock(&mc->sflock);
 680         psl = mc->sflist;
 681         if (!psl) {
 682                 rv = mc->sfmode == MCAST_EXCLUDE;
 683         } else {
 684                 int i;
 685
 686                 for (i=0; i<psl->sl_count; i++) {
 687                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 688                                 break;
 689                 }
 690                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 691                         rv = 0;
 692                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 693                         rv = 0;
 694         }
 695         read_unlock(&mc->sflock);
 696         read_unlock(&ipv6_sk_mc_lock);
 697
 698         return rv;
 699 }
 700
 701 static void ma_put(struct ifmcaddr6 *mc)
 702 {
 703         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 704                 in6_dev_put(mc->idev);
 705                 kfree(mc);
 706         }
 707 }
 708
 709 static void igmp6_group_added(struct ifmcaddr6 *mc)
 710 {
 711         struct net_device *dev = mc->idev->dev;
 712         char buf[MAX_ADDR_LEN];
 713
 714         spin_lock_bh(&mc->mca_lock);
 715         if (!(mc->mca_flags&MAF_LOADED)) {
 716                 mc->mca_flags |= MAF_LOADED;
 717                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 718                         dev_mc_add(dev, buf);
 719         }
 720         spin_unlock_bh(&mc->mca_lock);
 721
 722         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 723                 return;
 724
 725         if (MLD_V1_SEEN(mc->idev)) {
 726                 igmp6_join_group(mc);
 727                 return;
 728         }
 729         /* else v2 */
 730
 731         mc->mca_crcount = mc->idev->mc_qrv;
 732         mld_ifc_event(mc->idev);
 733 }
 734
 735 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 736 {
 737         struct net_device *dev = mc->idev->dev;
 738         char buf[MAX_ADDR_LEN];
 739
 740         spin_lock_bh(&mc->mca_lock);
 741         if (mc->mca_flags&MAF_LOADED) {
 742                 mc->mca_flags &= ~MAF_LOADED;
 743                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 744                         dev_mc_del(dev, buf);
 745         }
 746
 747         if (mc->mca_flags & MAF_NOREPORT)
 748                 goto done;
 749         spin_unlock_bh(&mc->mca_lock);
 750
 751         if (!mc->idev->dead)
 752                 igmp6_leave_group(mc);
 753
 754         spin_lock_bh(&mc->mca_lock);
 755         if (del_timer(&mc->mca_timer))
 756                 atomic_dec(&mc->mca_refcnt);
 757 done:
 758         ip6_mc_clear_src(mc);
 759         spin_unlock_bh(&mc->mca_lock);
 760 }
 761
 762 /*
 763  * deleted ifmcaddr6 manipulation
 764  */
 765 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 766 {
 767         struct ifmcaddr6 *pmc;
 768
 769         /* this is an "ifmcaddr6" for convenience; only the fields below
 770          * are actually used. In particular, the refcnt and users are not
 771          * used for management of the delete list. Using the same structure
 772          * for deleted items allows change reports to use common code with
 773          * non-deleted or query-response MCA's.
 774          */
 775         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 776         if (!pmc)
 777                 return;
 778
 779         spin_lock_bh(&im->mca_lock);
 780         spin_lock_init(&pmc->mca_lock);
 781         pmc->idev = im->idev;
 782         in6_dev_hold(idev);
 783         pmc->mca_addr = im->mca_addr;
 784         pmc->mca_crcount = idev->mc_qrv;
 785         pmc->mca_sfmode = im->mca_sfmode;
 786         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 787                 struct ip6_sf_list *psf;
 788
 789                 pmc->mca_tomb = im->mca_tomb;
 790                 pmc->mca_sources = im->mca_sources;
 791                 im->mca_tomb = im->mca_sources = NULL;
 792                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 793                         psf->sf_crcount = pmc->mca_crcount;
 794         }
 795         spin_unlock_bh(&im->mca_lock);
 796
 797         spin_lock_bh(&idev->mc_lock);
 798         pmc->next = idev->mc_tomb;
 799         idev->mc_tomb = pmc;
 800         spin_unlock_bh(&idev->mc_lock);
 801 }
 802
 803 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 804 {
 805         struct ifmcaddr6 *pmc, *pmc_prev;
 806         struct ip6_sf_list *psf, *psf_next;
 807
 808         spin_lock_bh(&idev->mc_lock);
 809         pmc_prev = NULL;
 810         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 811                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 812                         break;
 813                 pmc_prev = pmc;
 814         }
 815         if (pmc) {
 816                 if (pmc_prev)
 817                         pmc_prev->next = pmc->next;
 818                 else
 819                         idev->mc_tomb = pmc->next;
 820         }
 821         spin_unlock_bh(&idev->mc_lock);
 822
 823         if (pmc) {
 824                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 825                         psf_next = psf->sf_next;
 826                         kfree(psf);
 827                 }
 828                 in6_dev_put(pmc->idev);
 829                 kfree(pmc);
 830         }
 831 }
 832
 833 static void mld_clear_delrec(struct inet6_dev *idev)
 834 {
 835         struct ifmcaddr6 *pmc, *nextpmc;
 836
 837         spin_lock_bh(&idev->mc_lock);
 838         pmc = idev->mc_tomb;
 839         idev->mc_tomb = NULL;
 840         spin_unlock_bh(&idev->mc_lock);
 841
 842         for (; pmc; pmc = nextpmc) {
 843                 nextpmc = pmc->next;
 844                 ip6_mc_clear_src(pmc);
 845                 in6_dev_put(pmc->idev);
 846                 kfree(pmc);
 847         }
 848
 849         /* clear dead sources, too */
 850         read_lock_bh(&idev->lock);
 851         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 852                 struct ip6_sf_list *psf, *psf_next;
 853
 854                 spin_lock_bh(&pmc->mca_lock);
 855                 psf = pmc->mca_tomb;
 856                 pmc->mca_tomb = NULL;
 857                 spin_unlock_bh(&pmc->mca_lock);
 858                 for (; psf; psf=psf_next) {
 859                         psf_next = psf->sf_next;
 860                         kfree(psf);
 861                 }
 862         }
 863         read_unlock_bh(&idev->lock);
 864 }
 865
 866
 867 /*
 868  *      device multicast group inc (add if not found)
 869  */
 870 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 871 {
 872         struct ifmcaddr6 *mc;
 873         struct inet6_dev *idev;
 874
 875         idev = in6_dev_get(dev);
 876
 877         if (idev == NULL)
 878                 return -EINVAL;
 879
 880         write_lock_bh(&idev->lock);
 881         if (idev->dead) {
 882                 write_unlock_bh(&idev->lock);
 883                 in6_dev_put(idev);
 884                 return -ENODEV;
 885         }
 886
 887         for (mc = idev->mc_list; mc; mc = mc->next) {
 888                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 889                         mc->mca_users++;
 890                         write_unlock_bh(&idev->lock);
 891                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 892                                 NULL, 0);
 893                         in6_dev_put(idev);
 894                         return 0;
 895                 }
 896         }
 897
 898         /*
 899          *      not found: create a new one.
 900          */
 901
 902         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 903
 904         if (mc == NULL) {
 905                 write_unlock_bh(&idev->lock);
 906                 in6_dev_put(idev);
 907                 return -ENOMEM;
 908         }
 909
 910         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 911
 912         ipv6_addr_copy(&mc->mca_addr, addr);
 913         mc->idev = idev;
 914         mc->mca_users = 1;
 915         /* mca_stamp should be updated upon changes */
 916         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 917         atomic_set(&mc->mca_refcnt, 2);
 918         spin_lock_init(&mc->mca_lock);
 919
 920         /* initial mode is (EX, empty) */
 921         mc->mca_sfmode = MCAST_EXCLUDE;
 922         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 923
 924         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 925             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 926                 mc->mca_flags |= MAF_NOREPORT;
 927
 928         mc->next = idev->mc_list;
 929         idev->mc_list = mc;
 930         write_unlock_bh(&idev->lock);
 931
 932         mld_del_delrec(idev, &mc->mca_addr);
 933         igmp6_group_added(mc);
 934         ma_put(mc);
 935         return 0;
 936 }
 937
 938 /*
 939  *      device multicast group del
 940  */
 941 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 942 {
 943         struct ifmcaddr6 *ma, **map;
 944
 945         write_lock_bh(&idev->lock);
 946         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 947                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 948                         if (--ma->mca_users == 0) {
 949                                 *map = ma->next;
 950                                 write_unlock_bh(&idev->lock);
 951
 952                                 igmp6_group_dropped(ma);
 953
 954                                 ma_put(ma);
 955                                 return 0;
 956                         }
 957                         write_unlock_bh(&idev->lock);
 958                         return 0;
 959                 }
 960         }
 961         write_unlock_bh(&idev->lock);
 962
 963         return -ENOENT;
 964 }
 965
 966 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 967 {
 968         struct inet6_dev *idev = in6_dev_get(dev);
 969         int err;
 970
 971         if (!idev)
 972                 return -ENODEV;
 973
 974         err = __ipv6_dev_mc_dec(idev, addr);
 975
 976         in6_dev_put(idev);
 977
 978         return err;
 979 }
 980
 981 /*
 982  * identify MLD packets for MLD filter exceptions
 983  */
 984 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 985 {
 986         struct icmp6hdr *pic;
 987
 988         if (nexthdr != IPPROTO_ICMPV6)
 989                 return 0;
 990
 991         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 992                 return 0;
 993
 994         pic = icmp6_hdr(skb);
 995
 996         switch (pic->icmp6_type) {
 997         case ICMPV6_MGM_QUERY:
 998         case ICMPV6_MGM_REPORT:
 999         case ICMPV6_MGM_REDUCTION:
1000         case ICMPV6_MLD2_REPORT:
1001                 return 1;
1002         default:
1003                 break;
1004         }
1005         return 0;
1006 }
1007
1008 /*
1009  *      check if the interface/address pair is valid
1010  */
1011 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1012                         const struct in6_addr *src_addr)
1013 {
1014         struct inet6_dev *idev;
1015         struct ifmcaddr6 *mc;
1016         int rv = 0;
1017
1018         idev = in6_dev_get(dev);
1019         if (idev) {
1020                 read_lock_bh(&idev->lock);
1021                 for (mc = idev->mc_list; mc; mc=mc->next) {
1022                         if (ipv6_addr_equal(&mc->mca_addr, group))
1023                                 break;
1024                 }
1025                 if (mc) {
1026                         if (src_addr && !ipv6_addr_any(src_addr)) {
1027                                 struct ip6_sf_list *psf;
1028
1029                                 spin_lock_bh(&mc->mca_lock);
1030                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1031                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1032                                                 break;
1033                                 }
1034                                 if (psf)
1035                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1036                                                 psf->sf_count[MCAST_EXCLUDE] !=
1037                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1038                                 else
1039                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1040                                 spin_unlock_bh(&mc->mca_lock);
1041                         } else
1042                                 rv = 1; /* don't filter unspecified source */
1043                 }
1044                 read_unlock_bh(&idev->lock);
1045                 in6_dev_put(idev);
1046         }
1047         return rv;
1048 }
1049
1050 static void mld_gq_start_timer(struct inet6_dev *idev)
1051 {
1052         int tv = net_random() % idev->mc_maxdelay;
1053
1054         idev->mc_gq_running = 1;
1055         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1056                 in6_dev_hold(idev);
1057 }
1058
1059 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1060 {
1061         int tv = net_random() % delay;
1062
1063         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1064                 in6_dev_hold(idev);
1065 }
1066
1067 /*
1068  *      IGMP handling (alias multicast ICMPv6 messages)
1069  */
1070
1071 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1072 {
1073         unsigned long delay = resptime;
1074
1075         /* Do not start timer for these addresses */
1076         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1077             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1078                 return;
1079
1080         if (del_timer(&ma->mca_timer)) {
1081                 atomic_dec(&ma->mca_refcnt);
1082                 delay = ma->mca_timer.expires - jiffies;
1083         }
1084
1085         if (delay >= resptime) {
1086                 if (resptime)
1087                         delay = net_random() % resptime;
1088                 else
1089                         delay = 1;
1090         }
1091         ma->mca_timer.expires = jiffies + delay;
1092         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1093                 atomic_inc(&ma->mca_refcnt);
1094         ma->mca_flags |= MAF_TIMER_RUNNING;
1095 }
1096
1097 /* mark EXCLUDE-mode sources */
1098 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1099         struct in6_addr *srcs)
1100 {
1101         struct ip6_sf_list *psf;
1102         int i, scount;
1103
1104         scount = 0;
1105         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1106                 if (scount == nsrcs)
1107                         break;
1108                 for (i=0; i<nsrcs; i++) {
1109                         /* skip inactive filters */
1110                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1111                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1112                             psf->sf_count[MCAST_EXCLUDE])
1113                                 continue;
1114                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1115                                 scount++;
1116                                 break;
1117                         }
1118                 }
1119         }
1120         pmc->mca_flags &= ~MAF_GSQUERY;
1121         if (scount == nsrcs)    /* all sources excluded */
1122                 return 0;
1123         return 1;
1124 }
1125
1126 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1127         struct in6_addr *srcs)
1128 {
1129         struct ip6_sf_list *psf;
1130         int i, scount;
1131
1132         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1133                 return mld_xmarksources(pmc, nsrcs, srcs);
1134
1135         /* mark INCLUDE-mode sources */
1136
1137         scount = 0;
1138         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1139                 if (scount == nsrcs)
1140                         break;
1141                 for (i=0; i<nsrcs; i++) {
1142                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1143                                 psf->sf_gsresp = 1;
1144                                 scount++;
1145                                 break;
1146                         }
1147                 }
1148         }
1149         if (!scount) {
1150                 pmc->mca_flags &= ~MAF_GSQUERY;
1151                 return 0;
1152         }
1153         pmc->mca_flags |= MAF_GSQUERY;
1154         return 1;
1155 }
1156
1157 int igmp6_event_query(struct sk_buff *skb)
1158 {
1159         struct mld2_query *mlh2 = NULL;
1160         struct ifmcaddr6 *ma;
1161         struct in6_addr *group;
1162         unsigned long max_delay;
1163         struct inet6_dev *idev;
1164         struct icmp6hdr *hdr;
1165         int group_type;
1166         int mark = 0;
1167         int len;
1168
1169         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1170                 return -EINVAL;
1171
1172         /* compute payload length excluding extension headers */
1173         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1174         len -= skb_network_header_len(skb);
1175
1176         /* Drop queries with not link local source */
1177         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1178                 return -EINVAL;
1179
1180         idev = in6_dev_get(skb->dev);
1181
1182         if (idev == NULL)
1183                 return 0;
1184
1185         hdr = icmp6_hdr(skb);
1186         group = (struct in6_addr *) (hdr + 1);
1187         group_type = ipv6_addr_type(group);
1188
1189         if (group_type != IPV6_ADDR_ANY &&
1190             !(group_type&IPV6_ADDR_MULTICAST)) {
1191                 in6_dev_put(idev);
1192                 return -EINVAL;
1193         }
1194
1195         if (len == 24) {
1196                 int switchback;
1197                 /* MLDv1 router present */
1198
1199                 /* Translate milliseconds to jiffies */
1200                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1201
1202                 switchback = (idev->mc_qrv + 1) * max_delay;
1203                 idev->mc_v1_seen = jiffies + switchback;
1204
1205                 /* cancel the interface change timer */
1206                 idev->mc_ifc_count = 0;
1207                 if (del_timer(&idev->mc_ifc_timer))
1208                         __in6_dev_put(idev);
1209                 /* clear deleted report items */
1210                 mld_clear_delrec(idev);
1211         } else if (len >= 28) {
1212                 int srcs_offset = sizeof(struct mld2_query) -
1213                                   sizeof(struct icmp6hdr);
1214                 if (!pskb_may_pull(skb, srcs_offset)) {
1215                         in6_dev_put(idev);
1216                         return -EINVAL;
1217                 }
1218                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1219                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1220                 if (!max_delay)
1221                         max_delay = 1;
1222                 idev->mc_maxdelay = max_delay;
1223                 if (mlh2->qrv)
1224                         idev->mc_qrv = mlh2->qrv;
1225                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1226                         if (mlh2->nsrcs) {
1227                                 in6_dev_put(idev);
1228                                 return -EINVAL; /* no sources allowed */
1229                         }
1230                         mld_gq_start_timer(idev);
1231                         in6_dev_put(idev);
1232                         return 0;
1233                 }
1234                 /* mark sources to include, if group & source-specific */
1235                 if (mlh2->nsrcs != 0) {
1236                         if (!pskb_may_pull(skb, srcs_offset +
1237                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1238                                 in6_dev_put(idev);
1239                                 return -EINVAL;
1240                         }
1241                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1242                         mark = 1;
1243                 }
1244         } else {
1245                 in6_dev_put(idev);
1246                 return -EINVAL;
1247         }
1248
1249         read_lock_bh(&idev->lock);
1250         if (group_type == IPV6_ADDR_ANY) {
1251                 for (ma = idev->mc_list; ma; ma=ma->next) {
1252                         spin_lock_bh(&ma->mca_lock);
1253                         igmp6_group_queried(ma, max_delay);
1254                         spin_unlock_bh(&ma->mca_lock);
1255                 }
1256         } else {
1257                 for (ma = idev->mc_list; ma; ma=ma->next) {
1258                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1259                                 continue;
1260                         spin_lock_bh(&ma->mca_lock);
1261                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1262                                 /* gsquery <- gsquery && mark */
1263                                 if (!mark)
1264                                         ma->mca_flags &= ~MAF_GSQUERY;
1265                         } else {
1266                                 /* gsquery <- mark */
1267                                 if (mark)
1268                                         ma->mca_flags |= MAF_GSQUERY;
1269                                 else
1270                                         ma->mca_flags &= ~MAF_GSQUERY;
1271                         }
1272                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1273                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1274                                 igmp6_group_queried(ma, max_delay);
1275                         spin_unlock_bh(&ma->mca_lock);
1276                         break;
1277                 }
1278         }
1279         read_unlock_bh(&idev->lock);
1280         in6_dev_put(idev);
1281
1282         return 0;
1283 }
1284
1285
1286 int igmp6_event_report(struct sk_buff *skb)
1287 {
1288         struct ifmcaddr6 *ma;
1289         struct in6_addr *addrp;
1290         struct inet6_dev *idev;
1291         struct icmp6hdr *hdr;
1292         int addr_type;
1293
1294         /* Our own report looped back. Ignore it. */
1295         if (skb->pkt_type == PACKET_LOOPBACK)
1296                 return 0;
1297
1298         /* send our report if the MC router may not have heard this report */
1299         if (skb->pkt_type != PACKET_MULTICAST &&
1300             skb->pkt_type != PACKET_BROADCAST)
1301                 return 0;
1302
1303         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1304                 return -EINVAL;
1305
1306         hdr = icmp6_hdr(skb);
1307
1308         /* Drop reports with not link local source */
1309         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1310         if (addr_type != IPV6_ADDR_ANY &&
1311             !(addr_type&IPV6_ADDR_LINKLOCAL))
1312                 return -EINVAL;
1313
1314         addrp = (struct in6_addr *) (hdr + 1);
1315
1316         idev = in6_dev_get(skb->dev);
1317         if (idev == NULL)
1318                 return -ENODEV;
1319
1320         /*
1321          *      Cancel the timer for this group
1322          */
1323
1324         read_lock_bh(&idev->lock);
1325         for (ma = idev->mc_list; ma; ma=ma->next) {
1326                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1327                         spin_lock(&ma->mca_lock);
1328                         if (del_timer(&ma->mca_timer))
1329                                 atomic_dec(&ma->mca_refcnt);
1330                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1331                         spin_unlock(&ma->mca_lock);
1332                         break;
1333                 }
1334         }
1335         read_unlock_bh(&idev->lock);
1336         in6_dev_put(idev);
1337         return 0;
1338 }
1339
1340 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1341         int gdeleted, int sdeleted)
1342 {
1343         switch (type) {
1344         case MLD2_MODE_IS_INCLUDE:
1345         case MLD2_MODE_IS_EXCLUDE:
1346                 if (gdeleted || sdeleted)
1347                         return 0;
1348                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1349                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1350                                 return 1;
1351                         /* don't include if this source is excluded
1352                          * in all filters
1353                          */
1354                         if (psf->sf_count[MCAST_INCLUDE])
1355                                 return type == MLD2_MODE_IS_INCLUDE;
1356                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1357                                 psf->sf_count[MCAST_EXCLUDE];
1358                 }
1359                 return 0;
1360         case MLD2_CHANGE_TO_INCLUDE:
1361                 if (gdeleted || sdeleted)
1362                         return 0;
1363                 return psf->sf_count[MCAST_INCLUDE] != 0;
1364         case MLD2_CHANGE_TO_EXCLUDE:
1365                 if (gdeleted || sdeleted)
1366                         return 0;
1367                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1368                     psf->sf_count[MCAST_INCLUDE])
1369                         return 0;
1370                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1371                         psf->sf_count[MCAST_EXCLUDE];
1372         case MLD2_ALLOW_NEW_SOURCES:
1373                 if (gdeleted || !psf->sf_crcount)
1374                         return 0;
1375                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1376         case MLD2_BLOCK_OLD_SOURCES:
1377                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1378                         return gdeleted || (psf->sf_crcount && sdeleted);
1379                 return psf->sf_crcount && !gdeleted && !sdeleted;
1380         }
1381         return 0;
1382 }
1383
1384 static int
1385 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1386 {
1387         struct ip6_sf_list *psf;
1388         int scount = 0;
1389
1390         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1391                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1392                         continue;
1393                 scount++;
1394         }
1395         return scount;
1396 }
1397
1398 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1399 {
1400         struct net *net = dev_net(dev);
1401         struct sock *sk = net->ipv6.igmp_sk;
1402         struct sk_buff *skb;
1403         struct mld2_report *pmr;
1404         struct in6_addr addr_buf;
1405         const struct in6_addr *saddr;
1406         int err;
1407         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1408                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1409                      IPV6_TLV_PADN, 0 };
1410
1411         /* we assume size > sizeof(ra) here */
1412         skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1413
1414         if (!skb)
1415                 return NULL;
1416
1417         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1418
1419         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1420                 /* <draft-ietf-magma-mld-source-05.txt>:
1421                  * use unspecified address as the source address
1422                  * when a valid link-local address is not available.
1423                  */
1424                 saddr = &in6addr_any;
1425         } else
1426                 saddr = &addr_buf;
1427
1428         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1429
1430         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1431
1432         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1433         skb_put(skb, sizeof(*pmr));
1434         pmr = (struct mld2_report *)skb_transport_header(skb);
1435         pmr->type = ICMPV6_MLD2_REPORT;
1436         pmr->resv1 = 0;
1437         pmr->csum = 0;
1438         pmr->resv2 = 0;
1439         pmr->ngrec = 0;
1440         return skb;
1441 }
1442
1443 static void mld_sendpack(struct sk_buff *skb)
1444 {
1445         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1446         struct mld2_report *pmr =
1447                               (struct mld2_report *)skb_transport_header(skb);
1448         int payload_len, mldlen;
1449         struct inet6_dev *idev = in6_dev_get(skb->dev);
1450         struct net *net = dev_net(skb->dev);
1451         int err;
1452         struct flowi fl;
1453         struct dst_entry *dst;
1454
1455         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1456
1457         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1458         mldlen = skb->tail - skb->transport_header;
1459         pip6->payload_len = htons(payload_len);
1460
1461         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1462                 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1463                                              mldlen, 0));
1464
1465         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1466
1467         if (!dst) {
1468                 err = -ENOMEM;
1469                 goto err_out;
1470         }
1471
1472         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1473                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1474                          skb->dev->ifindex);
1475
1476         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1477         skb_dst_set(skb, dst);
1478         if (err)
1479                 goto err_out;
1480
1481         payload_len = skb->len;
1482
1483         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1484                       dst_output);
1485 out:
1486         if (!err) {
1487                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1488                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1489                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1490         } else
1491                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1492
1493         if (likely(idev != NULL))
1494                 in6_dev_put(idev);
1495         return;
1496
1497 err_out:
1498         kfree_skb(skb);
1499         goto out;
1500 }
1501
1502 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1503 {
1504         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1505 }
1506
1507 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1508         int type, struct mld2_grec **ppgr)
1509 {
1510         struct net_device *dev = pmc->idev->dev;
1511         struct mld2_report *pmr;
1512         struct mld2_grec *pgr;
1513
1514         if (!skb)
1515                 skb = mld_newpack(dev, dev->mtu);
1516         if (!skb)
1517                 return NULL;
1518         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1519         pgr->grec_type = type;
1520         pgr->grec_auxwords = 0;
1521         pgr->grec_nsrcs = 0;
1522         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1523         pmr = (struct mld2_report *)skb_transport_header(skb);
1524         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1525         *ppgr = pgr;
1526         return skb;
1527 }
1528
1529 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1530         skb_tailroom(skb)) : 0)
1531
1532 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1533         int type, int gdeleted, int sdeleted)
1534 {
1535         struct net_device *dev = pmc->idev->dev;
1536         struct mld2_report *pmr;
1537         struct mld2_grec *pgr = NULL;
1538         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1539         int scount, stotal, first, isquery, truncate;
1540
1541         if (pmc->mca_flags & MAF_NOREPORT)
1542                 return skb;
1543
1544         isquery = type == MLD2_MODE_IS_INCLUDE ||
1545                   type == MLD2_MODE_IS_EXCLUDE;
1546         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1547                     type == MLD2_CHANGE_TO_EXCLUDE;
1548
1549         stotal = scount = 0;
1550
1551         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1552
1553         if (!*psf_list)
1554                 goto empty_source;
1555
1556         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1557
1558         /* EX and TO_EX get a fresh packet, if needed */
1559         if (truncate) {
1560                 if (pmr && pmr->ngrec &&
1561                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1562                         if (skb)
1563                                 mld_sendpack(skb);
1564                         skb = mld_newpack(dev, dev->mtu);
1565                 }
1566         }
1567         first = 1;
1568         psf_prev = NULL;
1569         for (psf=*psf_list; psf; psf=psf_next) {
1570                 struct in6_addr *psrc;
1571
1572                 psf_next = psf->sf_next;
1573
1574                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1575                         psf_prev = psf;
1576                         continue;
1577                 }
1578
1579                 /* clear marks on query responses */
1580                 if (isquery)
1581                         psf->sf_gsresp = 0;
1582
1583                 if (AVAILABLE(skb) < sizeof(*psrc) +
1584                     first*sizeof(struct mld2_grec)) {
1585                         if (truncate && !first)
1586                                 break;   /* truncate these */
1587                         if (pgr)
1588                                 pgr->grec_nsrcs = htons(scount);
1589                         if (skb)
1590                                 mld_sendpack(skb);
1591                         skb = mld_newpack(dev, dev->mtu);
1592                         first = 1;
1593                         scount = 0;
1594                 }
1595                 if (first) {
1596                         skb = add_grhead(skb, pmc, type, &pgr);
1597                         first = 0;
1598                 }
1599                 if (!skb)
1600                         return NULL;
1601                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1602                 *psrc = psf->sf_addr;
1603                 scount++; stotal++;
1604                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1605                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1606                         psf->sf_crcount--;
1607                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1608                                 if (psf_prev)
1609                                         psf_prev->sf_next = psf->sf_next;
1610                                 else
1611                                         *psf_list = psf->sf_next;
1612                                 kfree(psf);
1613                                 continue;
1614                         }
1615                 }
1616                 psf_prev = psf;
1617         }
1618
1619 empty_source:
1620         if (!stotal) {
1621                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1622                     type == MLD2_BLOCK_OLD_SOURCES)
1623                         return skb;
1624                 if (pmc->mca_crcount || isquery) {
1625                         /* make sure we have room for group header */
1626                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1627                                 mld_sendpack(skb);
1628                                 skb = NULL; /* add_grhead will get a new one */
1629                         }
1630                         skb = add_grhead(skb, pmc, type, &pgr);
1631                 }
1632         }
1633         if (pgr)
1634                 pgr->grec_nsrcs = htons(scount);
1635
1636         if (isquery)
1637                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1638         return skb;
1639 }
1640
1641 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1642 {
1643         struct sk_buff *skb = NULL;
1644         int type;
1645
1646         if (!pmc) {
1647                 read_lock_bh(&idev->lock);
1648                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1649                         if (pmc->mca_flags & MAF_NOREPORT)
1650                                 continue;
1651                         spin_lock_bh(&pmc->mca_lock);
1652                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1653                                 type = MLD2_MODE_IS_EXCLUDE;
1654                         else
1655                                 type = MLD2_MODE_IS_INCLUDE;
1656                         skb = add_grec(skb, pmc, type, 0, 0);
1657                         spin_unlock_bh(&pmc->mca_lock);
1658                 }
1659                 read_unlock_bh(&idev->lock);
1660         } else {
1661                 spin_lock_bh(&pmc->mca_lock);
1662                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1663                         type = MLD2_MODE_IS_EXCLUDE;
1664                 else
1665                         type = MLD2_MODE_IS_INCLUDE;
1666                 skb = add_grec(skb, pmc, type, 0, 0);
1667                 spin_unlock_bh(&pmc->mca_lock);
1668         }
1669         if (skb)
1670                 mld_sendpack(skb);
1671 }
1672
1673 /*
1674  * remove zero-count source records from a source filter list
1675  */
1676 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1677 {
1678         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1679
1680         psf_prev = NULL;
1681         for (psf=*ppsf; psf; psf = psf_next) {
1682                 psf_next = psf->sf_next;
1683                 if (psf->sf_crcount == 0) {
1684                         if (psf_prev)
1685                                 psf_prev->sf_next = psf->sf_next;
1686                         else
1687                                 *ppsf = psf->sf_next;
1688                         kfree(psf);
1689                 } else
1690                         psf_prev = psf;
1691         }
1692 }
1693
1694 static void mld_send_cr(struct inet6_dev *idev)
1695 {
1696         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1697         struct sk_buff *skb = NULL;
1698         int type, dtype;
1699
1700         read_lock_bh(&idev->lock);
1701         spin_lock(&idev->mc_lock);
1702
1703         /* deleted MCA's */
1704         pmc_prev = NULL;
1705         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1706                 pmc_next = pmc->next;
1707                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1708                         type = MLD2_BLOCK_OLD_SOURCES;
1709                         dtype = MLD2_BLOCK_OLD_SOURCES;
1710                         skb = add_grec(skb, pmc, type, 1, 0);
1711                         skb = add_grec(skb, pmc, dtype, 1, 1);
1712                 }
1713                 if (pmc->mca_crcount) {
1714                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1715                                 type = MLD2_CHANGE_TO_INCLUDE;
1716                                 skb = add_grec(skb, pmc, type, 1, 0);
1717                         }
1718                         pmc->mca_crcount--;
1719                         if (pmc->mca_crcount == 0) {
1720                                 mld_clear_zeros(&pmc->mca_tomb);
1721                                 mld_clear_zeros(&pmc->mca_sources);
1722                         }
1723                 }
1724                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1725                     !pmc->mca_sources) {
1726                         if (pmc_prev)
1727                                 pmc_prev->next = pmc_next;
1728                         else
1729                                 idev->mc_tomb = pmc_next;
1730                         in6_dev_put(pmc->idev);
1731                         kfree(pmc);
1732                 } else
1733                         pmc_prev = pmc;
1734         }
1735         spin_unlock(&idev->mc_lock);
1736
1737         /* change recs */
1738         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1739                 spin_lock_bh(&pmc->mca_lock);
1740                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1741                         type = MLD2_BLOCK_OLD_SOURCES;
1742                         dtype = MLD2_ALLOW_NEW_SOURCES;
1743                 } else {
1744                         type = MLD2_ALLOW_NEW_SOURCES;
1745                         dtype = MLD2_BLOCK_OLD_SOURCES;
1746                 }
1747                 skb = add_grec(skb, pmc, type, 0, 0);
1748                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1749
1750                 /* filter mode changes */
1751                 if (pmc->mca_crcount) {
1752                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1753                                 type = MLD2_CHANGE_TO_EXCLUDE;
1754                         else
1755                                 type = MLD2_CHANGE_TO_INCLUDE;
1756                         skb = add_grec(skb, pmc, type, 0, 0);
1757                         pmc->mca_crcount--;
1758                 }
1759                 spin_unlock_bh(&pmc->mca_lock);
1760         }
1761         read_unlock_bh(&idev->lock);
1762         if (!skb)
1763                 return;
1764         (void) mld_sendpack(skb);
1765 }
1766
1767 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1768 {
1769         struct net *net = dev_net(dev);
1770         struct sock *sk = net->ipv6.igmp_sk;
1771         struct inet6_dev *idev;
1772         struct sk_buff *skb;
1773         struct icmp6hdr *hdr;
1774         const struct in6_addr *snd_addr, *saddr;
1775         struct in6_addr *addrp;
1776         struct in6_addr addr_buf;
1777         int err, len, payload_len, full_len;
1778         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1779                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1780                      IPV6_TLV_PADN, 0 };
1781         struct flowi fl;
1782         struct dst_entry *dst;
1783
1784         if (type == ICMPV6_MGM_REDUCTION)
1785                 snd_addr = &in6addr_linklocal_allrouters;
1786         else
1787                 snd_addr = addr;
1788
1789         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1790         payload_len = len + sizeof(ra);
1791         full_len = sizeof(struct ipv6hdr) + payload_len;
1792
1793         rcu_read_lock();
1794         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1795                       IPSTATS_MIB_OUT, full_len);
1796         rcu_read_unlock();
1797
1798         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1799
1800         if (skb == NULL) {
1801                 rcu_read_lock();
1802                 IP6_INC_STATS(net, __in6_dev_get(dev),
1803                               IPSTATS_MIB_OUTDISCARDS);
1804                 rcu_read_unlock();
1805                 return;
1806         }
1807
1808         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1809
1810         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1811                 /* <draft-ietf-magma-mld-source-05.txt>:
1812                  * use unspecified address as the source address
1813                  * when a valid link-local address is not available.
1814                  */
1815                 saddr = &in6addr_any;
1816         } else
1817                 saddr = &addr_buf;
1818
1819         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1820
1821         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1822
1823         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1824         memset(hdr, 0, sizeof(struct icmp6hdr));
1825         hdr->icmp6_type = type;
1826
1827         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1828         ipv6_addr_copy(addrp, addr);
1829
1830         hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1831                                            IPPROTO_ICMPV6,
1832                                            csum_partial(hdr, len, 0));
1833
1834         idev = in6_dev_get(skb->dev);
1835
1836         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1837         if (!dst) {
1838                 err = -ENOMEM;
1839                 goto err_out;
1840         }
1841
1842         icmpv6_flow_init(sk, &fl, type,
1843                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1844                          skb->dev->ifindex);
1845
1846         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1847         if (err)
1848                 goto err_out;
1849
1850         skb_dst_set(skb, dst);
1851         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1852                       dst_output);
1853 out:
1854         if (!err) {
1855                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1856                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1857                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1858         } else
1859                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1860
1861         if (likely(idev != NULL))
1862                 in6_dev_put(idev);
1863         return;
1864
1865 err_out:
1866         kfree_skb(skb);
1867         goto out;
1868 }
1869
1870 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1871         struct in6_addr *psfsrc)
1872 {
1873         struct ip6_sf_list *psf, *psf_prev;
1874         int rv = 0;
1875
1876         psf_prev = NULL;
1877         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1878                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1879                         break;
1880                 psf_prev = psf;
1881         }
1882         if (!psf || psf->sf_count[sfmode] == 0) {
1883                 /* source filter not found, or count wrong =>  bug */
1884                 return -ESRCH;
1885         }
1886         psf->sf_count[sfmode]--;
1887         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1888                 struct inet6_dev *idev = pmc->idev;
1889
1890                 /* no more filters for this source */
1891                 if (psf_prev)
1892                         psf_prev->sf_next = psf->sf_next;
1893                 else
1894                         pmc->mca_sources = psf->sf_next;
1895                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1896                     !MLD_V1_SEEN(idev)) {
1897                         psf->sf_crcount = idev->mc_qrv;
1898                         psf->sf_next = pmc->mca_tomb;
1899                         pmc->mca_tomb = psf;
1900                         rv = 1;
1901                 } else
1902                         kfree(psf);
1903         }
1904         return rv;
1905 }
1906
1907 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1908                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1909                           int delta)
1910 {
1911         struct ifmcaddr6 *pmc;
1912         int     changerec = 0;
1913         int     i, err;
1914
1915         if (!idev)
1916                 return -ENODEV;
1917         read_lock_bh(&idev->lock);
1918         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1919                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1920                         break;
1921         }
1922         if (!pmc) {
1923                 /* MCA not found?? bug */
1924                 read_unlock_bh(&idev->lock);
1925                 return -ESRCH;
1926         }
1927         spin_lock_bh(&pmc->mca_lock);
1928         sf_markstate(pmc);
1929         if (!delta) {
1930                 if (!pmc->mca_sfcount[sfmode]) {
1931                         spin_unlock_bh(&pmc->mca_lock);
1932                         read_unlock_bh(&idev->lock);
1933                         return -EINVAL;
1934                 }
1935                 pmc->mca_sfcount[sfmode]--;
1936         }
1937         err = 0;
1938         for (i=0; i<sfcount; i++) {
1939                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1940
1941                 changerec |= rv > 0;
1942                 if (!err && rv < 0)
1943                         err = rv;
1944         }
1945         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1946             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1947             pmc->mca_sfcount[MCAST_INCLUDE]) {
1948                 struct ip6_sf_list *psf;
1949
1950                 /* filter mode change */
1951                 pmc->mca_sfmode = MCAST_INCLUDE;
1952                 pmc->mca_crcount = idev->mc_qrv;
1953                 idev->mc_ifc_count = pmc->mca_crcount;
1954                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1955                         psf->sf_crcount = 0;
1956                 mld_ifc_event(pmc->idev);
1957         } else if (sf_setstate(pmc) || changerec)
1958                 mld_ifc_event(pmc->idev);
1959         spin_unlock_bh(&pmc->mca_lock);
1960         read_unlock_bh(&idev->lock);
1961         return err;
1962 }
1963
1964 /*
1965  * Add multicast single-source filter to the interface list
1966  */
1967 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1968         struct in6_addr *psfsrc, int delta)
1969 {
1970         struct ip6_sf_list *psf, *psf_prev;
1971
1972         psf_prev = NULL;
1973         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1974                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1975                         break;
1976                 psf_prev = psf;
1977         }
1978         if (!psf) {
1979                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1980                 if (!psf)
1981                         return -ENOBUFS;
1982
1983                 psf->sf_addr = *psfsrc;
1984                 if (psf_prev) {
1985                         psf_prev->sf_next = psf;
1986                 } else
1987                         pmc->mca_sources = psf;
1988         }
1989         psf->sf_count[sfmode]++;
1990         return 0;
1991 }
1992
1993 static void sf_markstate(struct ifmcaddr6 *pmc)
1994 {
1995         struct ip6_sf_list *psf;
1996         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1997
1998         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1999                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2000                         psf->sf_oldin = mca_xcount ==
2001                                 psf->sf_count[MCAST_EXCLUDE] &&
2002                                 !psf->sf_count[MCAST_INCLUDE];
2003                 } else
2004                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2005 }
2006
2007 static int sf_setstate(struct ifmcaddr6 *pmc)
2008 {
2009         struct ip6_sf_list *psf, *dpsf;
2010         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2011         int qrv = pmc->idev->mc_qrv;
2012         int new_in, rv;
2013
2014         rv = 0;
2015         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2016                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2017                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2018                                 !psf->sf_count[MCAST_INCLUDE];
2019                 } else
2020                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2021                 if (new_in) {
2022                         if (!psf->sf_oldin) {
2023                                 struct ip6_sf_list *prev = NULL;
2024
2025                                 for (dpsf=pmc->mca_tomb; dpsf;
2026                                      dpsf=dpsf->sf_next) {
2027                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2028                                             &psf->sf_addr))
2029                                                 break;
2030                                         prev = dpsf;
2031                                 }
2032                                 if (dpsf) {
2033                                         if (prev)
2034                                                 prev->sf_next = dpsf->sf_next;
2035                                         else
2036                                                 pmc->mca_tomb = dpsf->sf_next;
2037                                         kfree(dpsf);
2038                                 }
2039                                 psf->sf_crcount = qrv;
2040                                 rv++;
2041                         }
2042                 } else if (psf->sf_oldin) {
2043                         psf->sf_crcount = 0;
2044                         /*
2045                          * add or update "delete" records if an active filter
2046                          * is now inactive
2047                          */
2048                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2049                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2050                                     &psf->sf_addr))
2051                                         break;
2052                         if (!dpsf) {
2053                                 dpsf = (struct ip6_sf_list *)
2054                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2055                                 if (!dpsf)
2056                                         continue;
2057                                 *dpsf = *psf;
2058                                 /* pmc->mca_lock held by callers */
2059                                 dpsf->sf_next = pmc->mca_tomb;
2060                                 pmc->mca_tomb = dpsf;
2061                         }
2062                         dpsf->sf_crcount = qrv;
2063                         rv++;
2064                 }
2065         }
2066         return rv;
2067 }
2068
2069 /*
2070  * Add multicast source filter list to the interface list
2071  */
2072 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2073                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2074                           int delta)
2075 {
2076         struct ifmcaddr6 *pmc;
2077         int     isexclude;
2078         int     i, err;
2079
2080         if (!idev)
2081                 return -ENODEV;
2082         read_lock_bh(&idev->lock);
2083         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2084                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2085                         break;
2086         }
2087         if (!pmc) {
2088                 /* MCA not found?? bug */
2089                 read_unlock_bh(&idev->lock);
2090                 return -ESRCH;
2091         }
2092         spin_lock_bh(&pmc->mca_lock);
2093
2094         sf_markstate(pmc);
2095         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2096         if (!delta)
2097                 pmc->mca_sfcount[sfmode]++;
2098         err = 0;
2099         for (i=0; i<sfcount; i++) {
2100                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2101                 if (err)
2102                         break;
2103         }
2104         if (err) {
2105                 int j;
2106
2107                 if (!delta)
2108                         pmc->mca_sfcount[sfmode]--;
2109                 for (j=0; j<i; j++)
2110                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2111         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2112                 struct ip6_sf_list *psf;
2113
2114                 /* filter mode change */
2115                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2116                         pmc->mca_sfmode = MCAST_EXCLUDE;
2117                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2118                         pmc->mca_sfmode = MCAST_INCLUDE;
2119                 /* else no filters; keep old mode for reports */
2120
2121                 pmc->mca_crcount = idev->mc_qrv;
2122                 idev->mc_ifc_count = pmc->mca_crcount;
2123                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2124                         psf->sf_crcount = 0;
2125                 mld_ifc_event(idev);
2126         } else if (sf_setstate(pmc))
2127                 mld_ifc_event(idev);
2128         spin_unlock_bh(&pmc->mca_lock);
2129         read_unlock_bh(&idev->lock);
2130         return err;
2131 }
2132
2133 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2134 {
2135         struct ip6_sf_list *psf, *nextpsf;
2136
2137         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2138                 nextpsf = psf->sf_next;
2139                 kfree(psf);
2140         }
2141         pmc->mca_tomb = NULL;
2142         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2143                 nextpsf = psf->sf_next;
2144                 kfree(psf);
2145         }
2146         pmc->mca_sources = NULL;
2147         pmc->mca_sfmode = MCAST_EXCLUDE;
2148         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2149         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2150 }
2151
2152
2153 static void igmp6_join_group(struct ifmcaddr6 *ma)
2154 {
2155         unsigned long delay;
2156
2157         if (ma->mca_flags & MAF_NOREPORT)
2158                 return;
2159
2160         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2161
2162         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2163
2164         spin_lock_bh(&ma->mca_lock);
2165         if (del_timer(&ma->mca_timer)) {
2166                 atomic_dec(&ma->mca_refcnt);
2167                 delay = ma->mca_timer.expires - jiffies;
2168         }
2169
2170         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2171                 atomic_inc(&ma->mca_refcnt);
2172         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2173         spin_unlock_bh(&ma->mca_lock);
2174 }
2175
2176 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2177                             struct inet6_dev *idev)
2178 {
2179         int err;
2180
2181         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2182          * so no other readers or writers of iml or its sflist
2183          */
2184         if (!iml->sflist) {
2185                 /* any-source empty exclude case */
2186                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2187         }
2188         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2189                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2190         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2191         iml->sflist = NULL;
2192         return err;
2193 }
2194
2195 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2196 {
2197         if (MLD_V1_SEEN(ma->idev)) {
2198                 if (ma->mca_flags & MAF_LAST_REPORTER)
2199                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2200                                 ICMPV6_MGM_REDUCTION);
2201         } else {
2202                 mld_add_delrec(ma->idev, ma);
2203                 mld_ifc_event(ma->idev);
2204         }
2205 }
2206
2207 static void mld_gq_timer_expire(unsigned long data)
2208 {
2209         struct inet6_dev *idev = (struct inet6_dev *)data;
2210
2211         idev->mc_gq_running = 0;
2212         mld_send_report(idev, NULL);
2213         __in6_dev_put(idev);
2214 }
2215
2216 static void mld_ifc_timer_expire(unsigned long data)
2217 {
2218         struct inet6_dev *idev = (struct inet6_dev *)data;
2219
2220         mld_send_cr(idev);
2221         if (idev->mc_ifc_count) {
2222                 idev->mc_ifc_count--;
2223                 if (idev->mc_ifc_count)
2224                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2225         }
2226         __in6_dev_put(idev);
2227 }
2228
2229 static void mld_ifc_event(struct inet6_dev *idev)
2230 {
2231         if (MLD_V1_SEEN(idev))
2232                 return;
2233         idev->mc_ifc_count = idev->mc_qrv;
2234         mld_ifc_start_timer(idev, 1);
2235 }
2236
2237
2238 static void igmp6_timer_handler(unsigned long data)
2239 {
2240         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2241
2242         if (MLD_V1_SEEN(ma->idev))
2243                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2244         else
2245                 mld_send_report(ma->idev, ma);
2246
2247         spin_lock(&ma->mca_lock);
2248         ma->mca_flags |=  MAF_LAST_REPORTER;
2249         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2250         spin_unlock(&ma->mca_lock);
2251         ma_put(ma);
2252 }
2253
2254 /* Device changing type */
2255
2256 void ipv6_mc_unmap(struct inet6_dev *idev)
2257 {
2258         struct ifmcaddr6 *i;
2259
2260         /* Install multicast list, except for all-nodes (already installed) */
2261
2262         read_lock_bh(&idev->lock);
2263         for (i = idev->mc_list; i; i = i->next)
2264                 igmp6_group_dropped(i);
2265         read_unlock_bh(&idev->lock);
2266 }
2267
2268 void ipv6_mc_remap(struct inet6_dev *idev)
2269 {
2270         ipv6_mc_up(idev);
2271 }
2272
2273 /* Device going down */
2274
2275 void ipv6_mc_down(struct inet6_dev *idev)
2276 {
2277         struct ifmcaddr6 *i;
2278
2279         /* Withdraw multicast list */
2280
2281         read_lock_bh(&idev->lock);
2282         idev->mc_ifc_count = 0;
2283         if (del_timer(&idev->mc_ifc_timer))
2284                 __in6_dev_put(idev);
2285         idev->mc_gq_running = 0;
2286         if (del_timer(&idev->mc_gq_timer))
2287                 __in6_dev_put(idev);
2288
2289         for (i = idev->mc_list; i; i=i->next)
2290                 igmp6_group_dropped(i);
2291         read_unlock_bh(&idev->lock);
2292
2293         mld_clear_delrec(idev);
2294 }
2295
2296
2297 /* Device going up */
2298
2299 void ipv6_mc_up(struct inet6_dev *idev)
2300 {
2301         struct ifmcaddr6 *i;
2302
2303         /* Install multicast list, except for all-nodes (already installed) */
2304
2305         read_lock_bh(&idev->lock);
2306         for (i = idev->mc_list; i; i=i->next)
2307                 igmp6_group_added(i);
2308         read_unlock_bh(&idev->lock);
2309 }
2310
2311 /* IPv6 device initialization. */
2312
2313 void ipv6_mc_init_dev(struct inet6_dev *idev)
2314 {
2315         write_lock_bh(&idev->lock);
2316         spin_lock_init(&idev->mc_lock);
2317         idev->mc_gq_running = 0;
2318         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2319                         (unsigned long)idev);
2320         idev->mc_tomb = NULL;
2321         idev->mc_ifc_count = 0;
2322         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2323                         (unsigned long)idev);
2324         idev->mc_qrv = MLD_QRV_DEFAULT;
2325         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2326         idev->mc_v1_seen = 0;
2327         write_unlock_bh(&idev->lock);
2328 }
2329
2330 /*
2331  *      Device is about to be destroyed: clean up.
2332  */
2333
2334 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2335 {
2336         struct ifmcaddr6 *i;
2337
2338         /* Deactivate timers */
2339         ipv6_mc_down(idev);
2340
2341         /* Delete all-nodes address. */
2342         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2343          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2344          * fail.
2345          */
2346         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2347
2348         if (idev->cnf.forwarding)
2349                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2350
2351         write_lock_bh(&idev->lock);
2352         while ((i = idev->mc_list) != NULL) {
2353                 idev->mc_list = i->next;
2354                 write_unlock_bh(&idev->lock);
2355
2356                 igmp6_group_dropped(i);
2357                 ma_put(i);
2358
2359                 write_lock_bh(&idev->lock);
2360         }
2361         write_unlock_bh(&idev->lock);
2362 }
2363
2364 #ifdef CONFIG_PROC_FS
2365 struct igmp6_mc_iter_state {
2366         struct seq_net_private p;
2367         struct net_device *dev;
2368         struct inet6_dev *idev;
2369 };
2370
2371 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2372
2373 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2374 {
2375         struct ifmcaddr6 *im = NULL;
2376         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2377         struct net *net = seq_file_net(seq);
2378
2379         state->idev = NULL;
2380         for_each_netdev_rcu(net, state->dev) {
2381                 struct inet6_dev *idev;
2382                 idev = __in6_dev_get(state->dev);
2383                 if (!idev)
2384                         continue;
2385                 read_lock_bh(&idev->lock);
2386                 im = idev->mc_list;
2387                 if (im) {
2388                         state->idev = idev;
2389                         break;
2390                 }
2391                 read_unlock_bh(&idev->lock);
2392         }
2393         return im;
2394 }
2395
2396 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2397 {
2398         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2399
2400         im = im->next;
2401         while (!im) {
2402                 if (likely(state->idev != NULL))
2403                         read_unlock_bh(&state->idev->lock);
2404
2405                 state->dev = next_net_device_rcu(state->dev);
2406                 if (!state->dev) {
2407                         state->idev = NULL;
2408                         break;
2409                 }
2410                 state->idev = __in6_dev_get(state->dev);
2411                 if (!state->idev)
2412                         continue;
2413                 read_lock_bh(&state->idev->lock);
2414                 im = state->idev->mc_list;
2415         }
2416         return im;
2417 }
2418
2419 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2420 {
2421         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2422         if (im)
2423                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2424                         --pos;
2425         return pos ? NULL : im;
2426 }
2427
2428 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2429         __acquires(RCU)
2430 {
2431         rcu_read_lock();
2432         return igmp6_mc_get_idx(seq, *pos);
2433 }
2434
2435 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2436 {
2437         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2438
2439         ++*pos;
2440         return im;
2441 }
2442
2443 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2444         __releases(RCU)
2445 {
2446         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2447
2448         if (likely(state->idev != NULL)) {
2449                 read_unlock_bh(&state->idev->lock);
2450                 state->idev = NULL;
2451         }
2452         state->dev = NULL;
2453         rcu_read_unlock();
2454 }
2455
2456 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2457 {
2458         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2459         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2460
2461         seq_printf(seq,
2462                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2463                    state->dev->ifindex, state->dev->name,
2464                    &im->mca_addr,
2465                    im->mca_users, im->mca_flags,
2466                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2467                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2468         return 0;
2469 }
2470
2471 static const struct seq_operations igmp6_mc_seq_ops = {
2472         .start  =       igmp6_mc_seq_start,
2473         .next   =       igmp6_mc_seq_next,
2474         .stop   =       igmp6_mc_seq_stop,
2475         .show   =       igmp6_mc_seq_show,
2476 };
2477
2478 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2479 {
2480         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2481                             sizeof(struct igmp6_mc_iter_state));
2482 }
2483
2484 static const struct file_operations igmp6_mc_seq_fops = {
2485         .owner          =       THIS_MODULE,
2486         .open           =       igmp6_mc_seq_open,
2487         .read           =       seq_read,
2488         .llseek         =       seq_lseek,
2489         .release        =       seq_release_net,
2490 };
2491
2492 struct igmp6_mcf_iter_state {
2493         struct seq_net_private p;
2494         struct net_device *dev;
2495         struct inet6_dev *idev;
2496         struct ifmcaddr6 *im;
2497 };
2498
2499 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2500
2501 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2502 {
2503         struct ip6_sf_list *psf = NULL;
2504         struct ifmcaddr6 *im = NULL;
2505         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2506         struct net *net = seq_file_net(seq);
2507
2508         state->idev = NULL;
2509         state->im = NULL;
2510         for_each_netdev_rcu(net, state->dev) {
2511                 struct inet6_dev *idev;
2512                 idev = __in6_dev_get(state->dev);
2513                 if (unlikely(idev == NULL))
2514                         continue;
2515                 read_lock_bh(&idev->lock);
2516                 im = idev->mc_list;
2517                 if (likely(im != NULL)) {
2518                         spin_lock_bh(&im->mca_lock);
2519                         psf = im->mca_sources;
2520                         if (likely(psf != NULL)) {
2521                                 state->im = im;
2522                                 state->idev = idev;
2523                                 break;
2524                         }
2525                         spin_unlock_bh(&im->mca_lock);
2526                 }
2527                 read_unlock_bh(&idev->lock);
2528         }
2529         return psf;
2530 }
2531
2532 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2533 {
2534         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2535
2536         psf = psf->sf_next;
2537         while (!psf) {
2538                 spin_unlock_bh(&state->im->mca_lock);
2539                 state->im = state->im->next;
2540                 while (!state->im) {
2541                         if (likely(state->idev != NULL))
2542                                 read_unlock_bh(&state->idev->lock);
2543
2544                         state->dev = next_net_device_rcu(state->dev);
2545                         if (!state->dev) {
2546                                 state->idev = NULL;
2547                                 goto out;
2548                         }
2549                         state->idev = __in6_dev_get(state->dev);
2550                         if (!state->idev)
2551                                 continue;
2552                         read_lock_bh(&state->idev->lock);
2553                         state->im = state->idev->mc_list;
2554                 }
2555                 if (!state->im)
2556                         break;
2557                 spin_lock_bh(&state->im->mca_lock);
2558                 psf = state->im->mca_sources;
2559         }
2560 out:
2561         return psf;
2562 }
2563
2564 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2565 {
2566         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2567         if (psf)
2568                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2569                         --pos;
2570         return pos ? NULL : psf;
2571 }
2572
2573 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2574         __acquires(RCU)
2575 {
2576         rcu_read_lock();
2577         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2578 }
2579
2580 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2581 {
2582         struct ip6_sf_list *psf;
2583         if (v == SEQ_START_TOKEN)
2584                 psf = igmp6_mcf_get_first(seq);
2585         else
2586                 psf = igmp6_mcf_get_next(seq, v);
2587         ++*pos;
2588         return psf;
2589 }
2590
2591 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2592         __releases(RCU)
2593 {
2594         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2595         if (likely(state->im != NULL)) {
2596                 spin_unlock_bh(&state->im->mca_lock);
2597                 state->im = NULL;
2598         }
2599         if (likely(state->idev != NULL)) {
2600                 read_unlock_bh(&state->idev->lock);
2601                 state->idev = NULL;
2602         }
2603         state->dev = NULL;
2604         rcu_read_unlock();
2605 }
2606
2607 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2608 {
2609         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2610         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2611
2612         if (v == SEQ_START_TOKEN) {
2613                 seq_printf(seq,
2614                            "%3s %6s "
2615                            "%32s %32s %6s %6s\n", "Idx",
2616                            "Device", "Multicast Address",
2617                            "Source Address", "INC", "EXC");
2618         } else {
2619                 seq_printf(seq,
2620                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2621                            state->dev->ifindex, state->dev->name,
2622                            &state->im->mca_addr,
2623                            &psf->sf_addr,
2624                            psf->sf_count[MCAST_INCLUDE],
2625                            psf->sf_count[MCAST_EXCLUDE]);
2626         }
2627         return 0;
2628 }
2629
2630 static const struct seq_operations igmp6_mcf_seq_ops = {
2631         .start  =       igmp6_mcf_seq_start,
2632         .next   =       igmp6_mcf_seq_next,
2633         .stop   =       igmp6_mcf_seq_stop,
2634         .show   =       igmp6_mcf_seq_show,
2635 };
2636
2637 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2638 {
2639         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2640                             sizeof(struct igmp6_mcf_iter_state));
2641 }
2642
2643 static const struct file_operations igmp6_mcf_seq_fops = {
2644         .owner          =       THIS_MODULE,
2645         .open           =       igmp6_mcf_seq_open,
2646         .read           =       seq_read,
2647         .llseek         =       seq_lseek,
2648         .release        =       seq_release_net,
2649 };
2650
2651 static int __net_init igmp6_proc_init(struct net *net)
2652 {
2653         int err;
2654
2655         err = -ENOMEM;
2656         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2657                 goto out;
2658         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2659                                   &igmp6_mcf_seq_fops))
2660                 goto out_proc_net_igmp6;
2661
2662         err = 0;
2663 out:
2664         return err;
2665
2666 out_proc_net_igmp6:
2667         proc_net_remove(net, "igmp6");
2668         goto out;
2669 }
2670
2671 static void __net_exit igmp6_proc_exit(struct net *net)
2672 {
2673         proc_net_remove(net, "mcfilter6");
2674         proc_net_remove(net, "igmp6");
2675 }
2676 #else
2677 static inline int igmp6_proc_init(struct net *net)
2678 {
2679         return 0;
2680 }
2681 static inline void igmp6_proc_exit(struct net *net)
2682 {
2683 }
2684 #endif
2685
2686 static int __net_init igmp6_net_init(struct net *net)
2687 {
2688         int err;
2689
2690         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2691                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2692         if (err < 0) {
2693                 printk(KERN_ERR
2694                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2695                        err);
2696                 goto out;
2697         }
2698
2699         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2700
2701         err = igmp6_proc_init(net);
2702         if (err)
2703                 goto out_sock_create;
2704 out:
2705         return err;
2706
2707 out_sock_create:
2708         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2709         goto out;
2710 }
2711
2712 static void __net_exit igmp6_net_exit(struct net *net)
2713 {
2714         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2715         igmp6_proc_exit(net);
2716 }
2717
2718 static struct pernet_operations igmp6_net_ops = {
2719         .init = igmp6_net_init,
2720         .exit = igmp6_net_exit,
2721 };
2722
2723 int __init igmp6_init(void)
2724 {
2725         return register_pernet_subsys(&igmp6_net_ops);
2726 }
2727
2728 void igmp6_cleanup(void)
2729 {
2730         unregister_pernet_subsys(&igmp6_net_ops);
2731 }