net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <pedro_m@yahoo.com>
   7  *
   8  *      $Id: mcast.c,v 1.38 2001/08/15 07:36:31 davem Exp $
   9  *
  10  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17
  18 /* Changes:
  19  *
  20  *      yoshfuji        : fix format of router-alert option
  21  *      YOSHIFUJI Hideaki @USAGI:
  22  *              Fixed source address for MLD message based on
  23  *              <draft-ietf-magma-mld-source-02.txt>.
  24  *      YOSHIFUJI Hideaki @USAGI:
  25  *              - Ignore Queries for invalid addresses.
  26  *              - MLD for link-local addresses.
  27  *      David L Stevens <dlstevens@us.ibm.com>:
  28                 - MLDv2 support
  29  */
  30
  31 #include <linux/config.h>
  32 #include <linux/module.h>
  33 #include <linux/errno.h>
  34 #include <linux/types.h>
  35 #include <linux/string.h>
  36 #include <linux/socket.h>
  37 #include <linux/sockios.h>
  38 #include <linux/sched.h>
  39 #include <linux/net.h>
  40 #include <linux/in.h>
  41 #include <linux/in6.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/route.h>
  45 #include <linux/init.h>
  46 #include <linux/proc_fs.h>
  47
  48 #include <linux/netfilter.h>
  49 #include <linux/netfilter_ipv6.h>
  50
  51 #include <net/sock.h>
  52 #include <net/snmp.h>
  53
  54 #include <net/ipv6.h>
  55 #include <net/protocol.h>
  56 #include <net/if_inet6.h>
  57 #include <net/ndisc.h>
  58 #include <net/addrconf.h>
  59 #include <net/ip6_route.h>
  60
  61 #include <net/checksum.h>
  62
  63 /* Set to 3 to get tracing... */
  64 #define MCAST_DEBUG 2
  65
  66 #if MCAST_DEBUG >= 3
  67 #define MDBG(x) printk x
  68 #else
  69 #define MDBG(x)
  70 #endif
  71
  72 /*
  73  *  These header formats should be in a separate include file, but icmpv6.h
  74  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
  75  *  other files reference these.
  76  *
  77  *                      +-DLS 4/14/03
  78  */
  79
  80 /* Multicast Listener Discovery version 2 headers */
  81
  82 struct mld2_grec {
  83         __u8            grec_type;
  84         __u8            grec_auxwords;
  85         __u16           grec_nsrcs;
  86         struct in6_addr grec_mca;
  87         struct in6_addr grec_src[0];
  88 };
  89
  90 struct mld2_report {
  91         __u8    type;
  92         __u8    resv1;
  93         __u16   csum;
  94         __u16   resv2;
  95         __u16   ngrec;
  96         struct mld2_grec grec[0];
  97 };
  98
  99 struct mld2_query {
 100         __u8 type;
 101         __u8 code;
 102         __u16 csum;
 103         __u16 mrc;
 104         __u16 resv1;
 105         struct in6_addr mca;
 106 #if defined(__LITTLE_ENDIAN_BITFIELD)
 107         __u8 qrv:3,
 108              suppress:1,
 109              resv2:4;
 110 #elif defined(__BIG_ENDIAN_BITFIELD)
 111         __u8 resv2:4,
 112              suppress:1,
 113              qrv:3;
 114 #else
 115 #error "Please fix <asm/byteorder.h>"
 116 #endif
 117         __u8 qqic;
 118         __u16 nsrcs;
 119         struct in6_addr srcs[0];
 120 };
 121
 122 struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 123 struct in6_addr all_nodes_addr = {{{0xff,0x02,0,0,0,0,0,0,0,0,0,0,0,0,0,0x1}}};
 124
 125 /* Big mc list lock for all the sockets */
 126 static rwlock_t ipv6_sk_mc_lock = RW_LOCK_UNLOCKED;
 127
 128 static struct socket *igmp6_socket;
 129
 130 static void igmp6_join_group(struct ifmcaddr6 *ma);
 131 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 132 static void igmp6_timer_handler(unsigned long data);
 133
 134 static void mld_gq_timer_expire(unsigned long data);
 135 static void mld_ifc_timer_expire(unsigned long data);
 136 static void mld_ifc_event(struct inet6_dev *idev);
 137 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 138 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 139 static void mld_clear_delrec(struct inet6_dev *idev);
 140 static int sf_setstate(struct ifmcaddr6 *pmc);
 141 static void sf_markstate(struct ifmcaddr6 *pmc);
 142 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 143 int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, int sfmode,
 144         int sfcount, struct in6_addr *psfsrc, int delta);
 145 int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, int sfmode,
 146         int sfcount, struct in6_addr *psfsrc, int delta);
 147 int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 148         struct inet6_dev *idev);
 149
 150
 151 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 152 #define MLD_QRV_DEFAULT         2
 153
 154 #define MLD_V1_SEEN(idev) ((idev)->mc_v1_seen && \
 155                 time_before(jiffies, (idev)->mc_v1_seen))
 156
 157 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 158 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 159         ((value) < (thresh) ? (value) : \
 160         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \
 161         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 162
 163 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
 164 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 165
 166 #define IPV6_MLD_MAX_MSF        10
 167
 168 int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
 169
 170 /*
 171  *      socket join on multicast group
 172  */
 173
 174 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
 175 {
 176         struct net_device *dev = NULL;
 177         struct ipv6_mc_socklist *mc_lst;
 178         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
 179         int err;
 180
 181         if (!(ipv6_addr_type(addr) & IPV6_ADDR_MULTICAST))
 182                 return -EINVAL;
 183
 184         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 185
 186         if (mc_lst == NULL)
 187                 return -ENOMEM;
 188
 189         mc_lst->next = NULL;
 190         memcpy(&mc_lst->addr, addr, sizeof(struct in6_addr));
 191
 192         if (ifindex == 0) {
 193                 struct rt6_info *rt;
 194                 rt = rt6_lookup(addr, NULL, 0, 0);
 195                 if (rt) {
 196                         dev = rt->rt6i_dev;
 197                         dev_hold(dev);
 198                         dst_release(&rt->u.dst);
 199                 }
 200         } else
 201                 dev = dev_get_by_index(ifindex);
 202
 203         if (dev == NULL) {
 204                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 205                 return -ENODEV;
 206         }
 207
 208         mc_lst->ifindex = dev->ifindex;
 209         mc_lst->sfmode = MCAST_EXCLUDE;
 210         mc_lst->sflist = 0;
 211
 212         /*
 213          *      now add/increase the group membership on the device
 214          */
 215
 216         err = ipv6_dev_mc_inc(dev, addr);
 217
 218         if (err) {
 219                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 220                 dev_put(dev);
 221                 return err;
 222         }
 223
 224         write_lock_bh(&ipv6_sk_mc_lock);
 225         mc_lst->next = np->ipv6_mc_list;
 226         np->ipv6_mc_list = mc_lst;
 227         write_unlock_bh(&ipv6_sk_mc_lock);
 228
 229         dev_put(dev);
 230
 231         return 0;
 232 }
 233
 234 /*
 235  *      socket leave on multicast group
 236  */
 237 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 238 {
 239         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
 240         struct ipv6_mc_socklist *mc_lst, **lnk;
 241
 242         write_lock_bh(&ipv6_sk_mc_lock);
 243         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 244                 if (mc_lst->ifindex == ifindex &&
 245                     ipv6_addr_cmp(&mc_lst->addr, addr) == 0) {
 246                         struct net_device *dev;
 247
 248                         *lnk = mc_lst->next;
 249                         write_unlock_bh(&ipv6_sk_mc_lock);
 250
 251                         if ((dev = dev_get_by_index(ifindex)) != NULL) {
 252                                 struct inet6_dev *idev = in6_dev_get(dev);
 253
 254                                 if (idev) {
 255                                         (void) ip6_mc_leave_src(sk,mc_lst,idev);
 256                                         in6_dev_put(idev);
 257                                 }
 258                                 ipv6_dev_mc_dec(dev, &mc_lst->addr);
 259                                 dev_put(dev);
 260                         }
 261                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 262                         return 0;
 263                 }
 264         }
 265         write_unlock_bh(&ipv6_sk_mc_lock);
 266
 267         return -ENOENT;
 268 }
 269
 270 struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
 271 {
 272         struct net_device *dev = 0;
 273         struct inet6_dev *idev = 0;
 274
 275         if (ifindex == 0) {
 276                 struct rt6_info *rt;
 277
 278                 rt = rt6_lookup(group, NULL, 0, 0);
 279                 if (rt) {
 280                         dev = rt->rt6i_dev;
 281                         dev_hold(dev);
 282                         dst_release(&rt->u.dst);
 283                 }
 284         } else
 285                 dev = dev_get_by_index(ifindex);
 286
 287         if (!dev)
 288                 return 0;
 289         idev = in6_dev_get(dev);
 290         if (!idev) {
 291                 dev_put(dev);
 292                 return 0;
 293         }
 294         read_lock_bh(&idev->lock);
 295         if (idev->dead) {
 296                 read_unlock_bh(&idev->lock);
 297                 in6_dev_put(idev);
 298                 dev_put(dev);
 299                 return 0;
 300         }
 301         return idev;
 302 }
 303
 304 void ipv6_sock_mc_close(struct sock *sk)
 305 {
 306         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
 307         struct ipv6_mc_socklist *mc_lst;
 308
 309         write_lock_bh(&ipv6_sk_mc_lock);
 310         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 311                 struct net_device *dev;
 312
 313                 np->ipv6_mc_list = mc_lst->next;
 314                 write_unlock_bh(&ipv6_sk_mc_lock);
 315
 316                 dev = dev_get_by_index(mc_lst->ifindex);
 317                 if (dev) {
 318                         struct inet6_dev *idev = in6_dev_get(dev);
 319
 320                         if (idev) {
 321                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 322                                 in6_dev_put(idev);
 323                         }
 324                         ipv6_dev_mc_dec(dev, &mc_lst->addr);
 325                         dev_put(dev);
 326                 }
 327
 328                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 329
 330                 write_lock_bh(&ipv6_sk_mc_lock);
 331         }
 332         write_unlock_bh(&ipv6_sk_mc_lock);
 333 }
 334
 335 int ip6_mc_source(int add, int omode, struct sock *sk,
 336         struct group_source_req *pgsr)
 337 {
 338         struct in6_addr *source, *group;
 339         struct ipv6_mc_socklist *pmc;
 340         struct net_device *dev;
 341         struct inet6_dev *idev;
 342         struct ipv6_pinfo *inet6 = &sk->net_pinfo.af_inet6;
 343         struct ip6_sf_socklist *psl;
 344         int i, j, rv;
 345         int err;
 346
 347         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 348             pgsr->gsr_source.ss_family != AF_INET6)
 349                 return -EINVAL;
 350
 351         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 352         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 353
 354         if (!(ipv6_addr_type(group) & IPV6_ADDR_MULTICAST))
 355                 return -EINVAL;
 356
 357         idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
 358         if (!idev)
 359                 return -ENODEV;
 360         dev = idev->dev;
 361
 362         err = -EADDRNOTAVAIL;
 363
 364         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 365                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 366                         continue;
 367                 if (ipv6_addr_cmp(&pmc->addr, group) == 0)
 368                         break;
 369         }
 370         if (!pmc)               /* must have a prior join */
 371                 goto done;
 372         /* if a source filter was set, must be the same mode as before */
 373         if (pmc->sflist) {
 374                 if (pmc->sfmode != omode)
 375                         goto done;
 376         } else if (pmc->sfmode != omode) {
 377                 /* allow mode switches for empty-set filters */
 378                 ip6_mc_add_src(idev, group, omode, 0, 0, 0);
 379                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, 0, 0);
 380                 pmc->sfmode = omode;
 381         }
 382
 383         psl = pmc->sflist;
 384         if (!add) {
 385                 if (!psl)
 386                         goto done;
 387                 rv = !0;
 388                 for (i=0; i<psl->sl_count; i++) {
 389                         rv = memcmp(&psl->sl_addr[i], source,
 390                                 sizeof(struct in6_addr));
 391                         if (rv == 0)
 392                                 break;
 393                 }
 394                 if (rv)         /* source not found */
 395                         goto done;
 396
 397                 /* update the interface filter */
 398                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 399
 400                 for (j=i+1; j<psl->sl_count; j++)
 401                         psl->sl_addr[j-1] = psl->sl_addr[j];
 402                 psl->sl_count--;
 403                 err = 0;
 404                 goto done;
 405         }
 406         /* else, add a new source to the filter */
 407
 408         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 409                 err = -ENOBUFS;
 410                 goto done;
 411         }
 412         if (!psl || psl->sl_count == psl->sl_max) {
 413                 struct ip6_sf_socklist *newpsl;
 414                 int count = IP6_SFBLOCK;
 415
 416                 if (psl)
 417                         count += psl->sl_max;
 418                 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
 419                         IP6_SFLSIZE(count), GFP_ATOMIC);
 420                 if (!newpsl) {
 421                         err = -ENOBUFS;
 422                         goto done;
 423                 }
 424                 newpsl->sl_max = count;
 425                 newpsl->sl_count = count - IP6_SFBLOCK;
 426                 if (psl) {
 427                         for (i=0; i<psl->sl_count; i++)
 428                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 429                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 430                 }
 431                 pmc->sflist = psl = newpsl;
 432         }
 433         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 434         for (i=0; i<psl->sl_count; i++) {
 435                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 436                 if (rv == 0)
 437                         break;
 438         }
 439         if (rv == 0)            /* address already there is an error */
 440                 goto done;
 441         for (j=psl->sl_count-1; j>=i; j--)
 442                 psl->sl_addr[j+1] = psl->sl_addr[j];
 443         psl->sl_addr[i] = *source;
 444         psl->sl_count++;
 445         err = 0;
 446         /* update the interface list */
 447         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 448 done:
 449         read_unlock_bh(&idev->lock);
 450         in6_dev_put(idev);
 451         dev_put(dev);
 452         return err;
 453 }
 454
 455 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 456 {
 457         struct in6_addr *group;
 458         struct ipv6_mc_socklist *pmc;
 459         struct net_device *dev;
 460         struct inet6_dev *idev;
 461         struct ipv6_pinfo *inet6 = &sk->net_pinfo.af_inet6;
 462         struct ip6_sf_socklist *newpsl, *psl;
 463         int i, err;
 464
 465         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 466
 467         if (!(ipv6_addr_type(group) & IPV6_ADDR_MULTICAST))
 468                 return -EINVAL;
 469         if (gsf->gf_fmode != MCAST_INCLUDE &&
 470             gsf->gf_fmode != MCAST_EXCLUDE)
 471                 return -EINVAL;
 472
 473         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 474
 475         if (!idev)
 476                 return -ENODEV;
 477         dev = idev->dev;
 478         err = -EADDRNOTAVAIL;
 479
 480         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 481                 if (pmc->ifindex != gsf->gf_interface)
 482                         continue;
 483                 if (ipv6_addr_cmp(&pmc->addr, group) == 0)
 484                         break;
 485         }
 486         if (!pmc)               /* must have a prior join */
 487                 goto done;
 488         if (gsf->gf_numsrc) {
 489                 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
 490                                 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
 491                 if (!newpsl) {
 492                         err = -ENOBUFS;
 493                         goto done;
 494                 }
 495                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 496                 for (i=0; i<newpsl->sl_count; ++i) {
 497                         struct sockaddr_in6 *psin6;
 498
 499                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 500                         newpsl->sl_addr[i] = psin6->sin6_addr;
 501                 }
 502                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 503                         newpsl->sl_count, newpsl->sl_addr, 0);
 504                 if (err) {
 505                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 506                         goto done;
 507                 }
 508         } else {
 509                 newpsl = NULL;
 510                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 511         }
 512
 513         psl = pmc->sflist;
 514         if (psl) {
 515                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 516                         psl->sl_count, psl->sl_addr, 0);
 517                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 518         } else
 519                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, 0, 0);
 520         pmc->sflist = newpsl;
 521         pmc->sfmode = gsf->gf_fmode;
 522 done:
 523         read_unlock_bh(&idev->lock);
 524         in6_dev_put(idev);
 525         dev_put(dev);
 526         return err;
 527 }
 528
 529 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 530         struct group_filter *optval, int *optlen)
 531 {
 532         int err, i, count, copycount;
 533         struct in6_addr *group;
 534         struct ipv6_mc_socklist *pmc;
 535         struct inet6_dev *idev;
 536         struct net_device *dev;
 537         struct ipv6_pinfo *inet6 = &sk->net_pinfo.af_inet6;
 538         struct ip6_sf_socklist *psl;
 539
 540         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 541
 542         if (!(ipv6_addr_type(group) & IPV6_ADDR_MULTICAST))
 543                 return -EINVAL;
 544
 545         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 546
 547         if (!idev)
 548                 return -ENODEV;
 549
 550         dev = idev->dev;
 551
 552         err = -EADDRNOTAVAIL;
 553
 554         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 555                 if (pmc->ifindex != gsf->gf_interface)
 556                         continue;
 557                 if (ipv6_addr_cmp(group, &pmc->addr) == 0)
 558                         break;
 559         }
 560         if (!pmc)               /* must have a prior join */
 561                 goto done;
 562         gsf->gf_fmode = pmc->sfmode;
 563         psl = pmc->sflist;
 564         count = psl ? psl->sl_count : 0;
 565         read_unlock_bh(&idev->lock);
 566         in6_dev_put(idev);
 567         dev_put(dev);
 568
 569         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 570         gsf->gf_numsrc = count;
 571         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 572             copy_to_user((void *)optval, gsf, GROUP_FILTER_SIZE(0))) {
 573                 return -EFAULT;
 574         }
 575         for (i=0; i<copycount; i++) {
 576                 struct sockaddr_in6 *psin6;
 577                 struct sockaddr_storage ss;
 578
 579                 psin6 = (struct sockaddr_in6 *)&ss;
 580                 memset(&ss, 0, sizeof(ss));
 581                 psin6->sin6_family = AF_INET6;
 582                 psin6->sin6_addr = psl->sl_addr[i];
 583                 if (copy_to_user((void *)&optval->gf_slist[i], &ss, sizeof(ss)))
 584                         return -EFAULT;
 585         }
 586         return 0;
 587 done:
 588         read_unlock_bh(&idev->lock);
 589         in6_dev_put(idev);
 590         dev_put(dev);
 591         return err;
 592 }
 593
 594 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 595         struct in6_addr *src_addr)
 596 {
 597         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
 598         struct ipv6_mc_socklist *mc;
 599         struct ip6_sf_socklist *psl;
 600         int rv = 1;
 601
 602         read_lock(&ipv6_sk_mc_lock);
 603         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 604                 if (ipv6_addr_cmp(&mc->addr, mc_addr) == 0)
 605                         break;
 606         }
 607         if (!mc) {
 608                 read_unlock(&ipv6_sk_mc_lock);
 609                 return 1;
 610         }
 611         psl = mc->sflist;
 612         if (!psl) {
 613                 rv = mc->sfmode == MCAST_EXCLUDE;
 614         } else {
 615                 int i;
 616
 617                 for (i=0; i<psl->sl_count; i++) {
 618                         if (ipv6_addr_cmp(&psl->sl_addr[i], src_addr) == 0)
 619                                 break;
 620                 }
 621                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 622                         rv = 0;
 623                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 624                         rv = 0;
 625         }
 626         read_unlock(&ipv6_sk_mc_lock);
 627
 628         return rv;
 629 }
 630
 631 static void ma_put(struct ifmcaddr6 *mc)
 632 {
 633         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 634                 in6_dev_put(mc->idev);
 635                 kfree(mc);
 636         }
 637 }
 638
 639 static void igmp6_group_added(struct ifmcaddr6 *mc)
 640 {
 641         struct net_device *dev = mc->idev->dev;
 642         char buf[MAX_ADDR_LEN];
 643
 644         spin_lock_bh(&mc->mca_lock);
 645         if (!(mc->mca_flags&MAF_LOADED)) {
 646                 mc->mca_flags |= MAF_LOADED;
 647                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 648                         dev_mc_add(dev, buf, dev->addr_len, 0);
 649         }
 650         spin_unlock_bh(&mc->mca_lock);
 651
 652         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 653                 return;
 654
 655         if (MLD_V1_SEEN(mc->idev)) {
 656                 igmp6_join_group(mc);
 657                 return;
 658         }
 659         /* else v2 */
 660
 661         mc->mca_crcount = mc->idev->mc_qrv;
 662         mld_ifc_event(mc->idev);
 663 }
 664
 665 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 666 {
 667         struct net_device *dev = mc->idev->dev;
 668         char buf[MAX_ADDR_LEN];
 669
 670         spin_lock_bh(&mc->mca_lock);
 671         if (mc->mca_flags&MAF_LOADED) {
 672                 mc->mca_flags &= ~MAF_LOADED;
 673                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 674                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 675         }
 676
 677         if (mc->mca_flags & MAF_NOREPORT)
 678                 goto done;
 679         spin_unlock_bh(&mc->mca_lock);
 680
 681         if (!mc->idev->dead)
 682                 igmp6_leave_group(mc);
 683
 684         spin_lock_bh(&mc->mca_lock);
 685         if (del_timer(&mc->mca_timer))
 686                 atomic_dec(&mc->mca_refcnt);
 687 done:
 688         ip6_mc_clear_src(mc);
 689         spin_unlock_bh(&mc->mca_lock);
 690 }
 691
 692 /*
 693  * deleted ifmcaddr6 manipulation
 694  */
 695 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 696 {
 697         struct ifmcaddr6 *pmc;
 698
 699         /* this is an "ifmcaddr6" for convenience; only the fields below
 700          * are actually used. In particular, the refcnt and users are not
 701          * used for management of the delete list. Using the same structure
 702          * for deleted items allows change reports to use common code with
 703          * non-deleted or query-response MCA's.
 704          */
 705         pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
 706         if (!pmc)
 707                 return;
 708         memset(pmc, 0, sizeof(*pmc));
 709         spin_lock_bh(&im->mca_lock);
 710         pmc->mca_lock = SPIN_LOCK_UNLOCKED;
 711         pmc->idev = im->idev;
 712         in6_dev_hold(idev);
 713         pmc->mca_addr = im->mca_addr;
 714         pmc->mca_crcount = idev->mc_qrv;
 715         pmc->mca_sfmode = im->mca_sfmode;
 716         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 717                 struct ip6_sf_list *psf;
 718
 719                 pmc->mca_tomb = im->mca_tomb;
 720                 pmc->mca_sources = im->mca_sources;
 721                 im->mca_tomb = im->mca_sources = 0;
 722                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 723                         psf->sf_crcount = pmc->mca_crcount;
 724         }
 725         spin_unlock_bh(&im->mca_lock);
 726
 727         write_lock_bh(&idev->mc_lock);
 728         pmc->next = idev->mc_tomb;
 729         idev->mc_tomb = pmc;
 730         write_unlock_bh(&idev->mc_lock);
 731 }
 732
 733 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 734 {
 735         struct ifmcaddr6 *pmc, *pmc_prev;
 736         struct ip6_sf_list *psf, *psf_next;
 737
 738         write_lock_bh(&idev->mc_lock);
 739         pmc_prev = 0;
 740         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 741                 if (ipv6_addr_cmp(&pmc->mca_addr, pmca) == 0)
 742                         break;
 743                 pmc_prev = pmc;
 744         }
 745         if (pmc) {
 746                 if (pmc_prev)
 747                         pmc_prev->next = pmc->next;
 748                 else
 749                         idev->mc_tomb = pmc->next;
 750         }
 751         write_unlock_bh(&idev->mc_lock);
 752         if (pmc) {
 753                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 754                         psf_next = psf->sf_next;
 755                         kfree(psf);
 756                 }
 757                 in6_dev_put(pmc->idev);
 758                 kfree(pmc);
 759         }
 760 }
 761
 762 static void mld_clear_delrec(struct inet6_dev *idev)
 763 {
 764         struct ifmcaddr6 *pmc, *nextpmc;
 765
 766         write_lock_bh(&idev->mc_lock);
 767         pmc = idev->mc_tomb;
 768         idev->mc_tomb = 0;
 769         write_unlock_bh(&idev->mc_lock);
 770
 771         for (; pmc; pmc = nextpmc) {
 772                 nextpmc = pmc->next;
 773                 ip6_mc_clear_src(pmc);
 774                 in6_dev_put(pmc->idev);
 775                 kfree(pmc);
 776         }
 777
 778         /* clear dead sources, too */
 779         read_lock_bh(&idev->lock);
 780         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 781                 struct ip6_sf_list *psf, *psf_next;
 782
 783                 spin_lock_bh(&pmc->mca_lock);
 784                 psf = pmc->mca_tomb;
 785                 pmc->mca_tomb = 0;
 786                 spin_unlock_bh(&pmc->mca_lock);
 787                 for (; psf; psf=psf_next) {
 788                         psf_next = psf->sf_next;
 789                         kfree(psf);
 790                 }
 791         }
 792         read_unlock_bh(&idev->lock);
 793 }
 794
 795
 796 /*
 797  *      device multicast group inc (add if not found)
 798  */
 799 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 800 {
 801         struct ifmcaddr6 *mc;
 802         struct inet6_dev *idev;
 803
 804         idev = in6_dev_get(dev);
 805
 806         if (idev == NULL)
 807                 return -EINVAL;
 808
 809         write_lock_bh(&idev->lock);
 810         if (idev->dead) {
 811                 write_unlock_bh(&idev->lock);
 812                 in6_dev_put(idev);
 813                 return -ENODEV;
 814         }
 815
 816         for (mc = idev->mc_list; mc; mc = mc->next) {
 817                 if (ipv6_addr_cmp(&mc->mca_addr, addr) == 0) {
 818                         mc->mca_users++;
 819                         write_unlock_bh(&idev->lock);
 820                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 821                                 0, 0);
 822                         in6_dev_put(idev);
 823                         return 0;
 824                 }
 825         }
 826
 827         /*
 828          *      not found: create a new one.
 829          */
 830
 831         mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 832
 833         if (mc == NULL) {
 834                 write_unlock_bh(&idev->lock);
 835                 in6_dev_put(idev);
 836                 return -ENOMEM;
 837         }
 838
 839         memset(mc, 0, sizeof(struct ifmcaddr6));
 840         mc->mca_timer.function = igmp6_timer_handler;
 841         mc->mca_timer.data = (unsigned long) mc;
 842
 843         memcpy(&mc->mca_addr, addr, sizeof(struct in6_addr));
 844         mc->idev = idev;
 845         mc->mca_users = 1;
 846         atomic_set(&mc->mca_refcnt, 2);
 847         mc->mca_lock = SPIN_LOCK_UNLOCKED;
 848
 849         /* initial mode is (EX, empty) */
 850         mc->mca_sfmode = MCAST_EXCLUDE;
 851         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 852
 853         if (ipv6_addr_cmp(&mc->mca_addr, &all_nodes_addr) == 0 ||
 854             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 855                 mc->mca_flags |= MAF_NOREPORT;
 856
 857         mc->next = idev->mc_list;
 858         idev->mc_list = mc;
 859         write_unlock_bh(&idev->lock);
 860
 861         mld_del_delrec(idev, &mc->mca_addr);
 862         igmp6_group_added(mc);
 863         ma_put(mc);
 864         return 0;
 865 }
 866
 867 /*
 868  *      device multicast group del
 869  */
 870 static int __ipv6_dev_mc_dec(struct net_device *dev, struct inet6_dev *idev, struct in6_addr *addr)
 871 {
 872         struct ifmcaddr6 *ma, **map;
 873
 874         write_lock_bh(&idev->lock);
 875         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 876                 if (ipv6_addr_cmp(&ma->mca_addr, addr) == 0) {
 877                         if (--ma->mca_users == 0) {
 878                                 *map = ma->next;
 879                                 write_unlock_bh(&idev->lock);
 880
 881                                 igmp6_group_dropped(ma);
 882
 883                                 ma_put(ma);
 884                                 return 0;
 885                         }
 886                         write_unlock_bh(&idev->lock);
 887                         return 0;
 888                 }
 889         }
 890         write_unlock_bh(&idev->lock);
 891
 892         return -ENOENT;
 893 }
 894
 895 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
 896 {
 897         struct inet6_dev *idev = in6_dev_get(dev);
 898         int err;
 899
 900         if (!idev)
 901                 return -ENODEV;
 902
 903         err = __ipv6_dev_mc_dec(dev, idev, addr);
 904
 905         in6_dev_put(idev);
 906
 907         return err;
 908 }
 909
 910 /*
 911  *      check if the interface/address pair is valid
 912  */
 913 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
 914         struct in6_addr *src_addr)
 915 {
 916         struct inet6_dev *idev;
 917         struct ifmcaddr6 *mc;
 918         int rv = 0;
 919
 920         idev = in6_dev_get(dev);
 921         if (idev) {
 922                 read_lock_bh(&idev->lock);
 923                 for (mc = idev->mc_list; mc; mc=mc->next) {
 924                         if (ipv6_addr_cmp(&mc->mca_addr, group) == 0)
 925                                 break;
 926                 }
 927                 if (mc) {
 928                         if (!ipv6_addr_any(src_addr)) {
 929                                 struct ip6_sf_list *psf;
 930
 931                                 spin_lock_bh(&mc->mca_lock);
 932                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 933                                         if (ipv6_addr_cmp(&psf->sf_addr,
 934                                             src_addr) == 0)
 935                                                 break;
 936                                 }
 937                                 if (psf)
 938                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 939                                                 psf->sf_count[MCAST_EXCLUDE] !=
 940                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 941                                 else
 942                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 943                                 spin_unlock_bh(&mc->mca_lock);
 944                         } else
 945                                 rv = 1; /* don't filter unspecified source */
 946                 }
 947                 read_unlock_bh(&idev->lock);
 948                 in6_dev_put(idev);
 949         }
 950         return rv;
 951 }
 952
 953 static void mld_gq_start_timer(struct inet6_dev *idev)
 954 {
 955         int tv = net_random() % idev->mc_maxdelay;
 956
 957         idev->mc_gq_running = 1;
 958         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
 959                 in6_dev_hold(idev);
 960 }
 961
 962 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
 963 {
 964         int tv = net_random() % delay;
 965
 966         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
 967                 in6_dev_hold(idev);
 968 }
 969
 970 /*
 971  *      IGMP handling (alias multicast ICMPv6 messages)
 972  */
 973
 974 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
 975 {
 976         unsigned long delay = resptime;
 977
 978         /* Do not start timer for these addresses */
 979         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
 980             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 981                 return;
 982
 983         if (del_timer(&ma->mca_timer)) {
 984                 atomic_dec(&ma->mca_refcnt);
 985                 delay = ma->mca_timer.expires - jiffies;
 986         }
 987
 988         if (delay >= resptime) {
 989                 if (resptime)
 990                         delay = net_random() % resptime;
 991                 else
 992                         delay = 1;
 993         }
 994
 995         ma->mca_timer.expires = jiffies + delay;
 996         if (!mod_timer(&ma->mca_timer, jiffies + delay))
 997                 atomic_inc(&ma->mca_refcnt);
 998         ma->mca_flags |= MAF_TIMER_RUNNING;
 999         spin_unlock(&ma->mca_lock);
1000 }
1001
1002 static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1003         struct in6_addr *srcs)
1004 {
1005         struct ip6_sf_list *psf;
1006         int i, scount;
1007
1008         scount = 0;
1009         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1010                 if (scount == nsrcs)
1011                         break;
1012                 for (i=0; i<nsrcs; i++)
1013                         if (ipv6_addr_cmp(&srcs[i], &psf->sf_addr) == 0) {
1014                                 psf->sf_gsresp = 1;
1015                                 scount++;
1016                                 break;
1017                         }
1018         }
1019 }
1020
1021 int igmp6_event_query(struct sk_buff *skb)
1022 {
1023         struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw;
1024         struct ifmcaddr6 *ma;
1025         struct in6_addr *group;
1026         unsigned long max_delay;
1027         struct inet6_dev *idev;
1028         struct icmp6hdr *hdr;
1029         int group_type;
1030         int mark = 0;
1031         int len;
1032
1033         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1034                 return -EINVAL;
1035
1036         len = ntohs(skb->nh.ipv6h->payload_len);
1037
1038         /* Drop queries with not link local source */
1039         if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1040                 return -EINVAL;
1041
1042         idev = in6_dev_get(skb->dev);
1043
1044         if (idev == NULL)
1045                 return 0;
1046
1047         hdr = (struct icmp6hdr *) skb->h.raw;
1048         group = (struct in6_addr *) (hdr + 1);
1049         group_type = ipv6_addr_type(group);
1050
1051         if (group_type != IPV6_ADDR_ANY &&
1052             !(group_type&IPV6_ADDR_MULTICAST)) {
1053                 in6_dev_put(idev);
1054                 return -EINVAL;
1055         }
1056
1057         if (len == 24) {
1058                 int switchback;
1059                 /* MLDv1 router present */
1060
1061                 /* Translate milliseconds to jiffies */
1062                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1063
1064                 switchback = (idev->mc_qrv + 1) * max_delay;
1065                 idev->mc_v1_seen = jiffies + switchback;
1066
1067                 /* cancel the interface change timer */
1068                 idev->mc_ifc_count = 0;
1069                 if (del_timer(&idev->mc_ifc_timer))
1070                         __in6_dev_put(idev);
1071                 /* clear deleted report items */
1072                 mld_clear_delrec(idev);
1073         } else if (len >= 28) {
1074                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1075                 if (!max_delay)
1076                         max_delay = 1;
1077                 idev->mc_maxdelay = max_delay;
1078                 if (mlh2->qrv)
1079                         idev->mc_qrv = mlh2->qrv;
1080                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1081                         if (mlh2->nsrcs) {
1082                                 in6_dev_put(idev);
1083                                 return -EINVAL; /* no sources allowed */
1084                         }
1085                         mld_gq_start_timer(idev);
1086                         in6_dev_put(idev);
1087                         return 0;
1088                 }
1089                 /* mark sources to include, if group & source-specific */
1090                 mark = mlh2->nsrcs != 0;
1091         } else {
1092                 in6_dev_put(idev);
1093                 return -EINVAL;
1094         }
1095
1096         read_lock_bh(&idev->lock);
1097         if (group_type == IPV6_ADDR_ANY) {
1098                 for (ma = idev->mc_list; ma; ma=ma->next) {
1099                         spin_lock_bh(&ma->mca_lock);
1100                         igmp6_group_queried(ma, max_delay);
1101                         spin_unlock_bh(&ma->mca_lock);
1102                 }
1103         } else {
1104                 for (ma = idev->mc_list; ma; ma=ma->next) {
1105                         if (group_type != IPV6_ADDR_ANY &&
1106                             ipv6_addr_cmp(group, &ma->mca_addr) != 0)
1107                                 continue;
1108                         spin_lock_bh(&ma->mca_lock);
1109                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1110                                 /* gsquery <- gsquery && mark */
1111                                 if (!mark)
1112                                         ma->mca_flags &= ~MAF_GSQUERY;
1113                         } else {
1114                                 /* gsquery <- mark */
1115                                 if (mark)
1116                                         ma->mca_flags |= MAF_GSQUERY;
1117                                 else
1118                                         ma->mca_flags &= ~MAF_GSQUERY;
1119                         }
1120                         if (ma->mca_flags & MAF_GSQUERY)
1121                                 mld_marksources(ma, ntohs(mlh2->nsrcs),
1122                                         mlh2->srcs);
1123                         igmp6_group_queried(ma, max_delay);
1124                         spin_unlock_bh(&ma->mca_lock);
1125                         if (group_type != IPV6_ADDR_ANY)
1126                                 break;
1127                 }
1128         }
1129         read_unlock_bh(&idev->lock);
1130         in6_dev_put(idev);
1131
1132         return 0;
1133 }
1134
1135
1136 int igmp6_event_report(struct sk_buff *skb)
1137 {
1138         struct ifmcaddr6 *ma;
1139         struct in6_addr *addrp;
1140         struct inet6_dev *idev;
1141         struct icmp6hdr *hdr;
1142         int addr_type;
1143
1144         /* Our own report looped back. Ignore it. */
1145         if (skb->pkt_type == PACKET_LOOPBACK)
1146                 return 0;
1147
1148         /* send our report if the MC router may not have heard this report */
1149         if (skb->pkt_type != PACKET_MULTICAST &&
1150             skb->pkt_type != PACKET_BROADCAST)
1151                 return 0;
1152
1153         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1154                 return -EINVAL;
1155
1156         hdr = (struct icmp6hdr*) skb->h.raw;
1157
1158         /* Drop reports with not link local source */
1159         addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1160         if (addr_type != IPV6_ADDR_ANY &&
1161             !(addr_type&IPV6_ADDR_LINKLOCAL))
1162                 return -EINVAL;
1163
1164         addrp = (struct in6_addr *) (hdr + 1);
1165
1166         idev = in6_dev_get(skb->dev);
1167         if (idev == NULL)
1168                 return -ENODEV;
1169
1170         /*
1171          *      Cancel the timer for this group
1172          */
1173
1174         read_lock_bh(&idev->lock);
1175         for (ma = idev->mc_list; ma; ma=ma->next) {
1176                 if (ipv6_addr_cmp(&ma->mca_addr, addrp) == 0) {
1177                         spin_lock(&ma->mca_lock);
1178                         if (del_timer(&ma->mca_timer))
1179                                 atomic_dec(&ma->mca_refcnt);
1180                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1181                         spin_unlock(&ma->mca_lock);
1182                         break;
1183                 }
1184         }
1185         read_unlock_bh(&idev->lock);
1186         in6_dev_put(idev);
1187         return 0;
1188 }
1189
1190 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1191         int gdeleted, int sdeleted)
1192 {
1193         switch (type) {
1194         case MLD2_MODE_IS_INCLUDE:
1195         case MLD2_MODE_IS_EXCLUDE:
1196                 if (gdeleted || sdeleted)
1197                         return 0;
1198                 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1199         case MLD2_CHANGE_TO_INCLUDE:
1200                 if (gdeleted || sdeleted)
1201                         return 0;
1202                 return psf->sf_count[MCAST_INCLUDE] != 0;
1203         case MLD2_CHANGE_TO_EXCLUDE:
1204                 if (gdeleted || sdeleted)
1205                         return 0;
1206                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1207                     psf->sf_count[MCAST_INCLUDE])
1208                         return 0;
1209                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1210                         psf->sf_count[MCAST_EXCLUDE];
1211         case MLD2_ALLOW_NEW_SOURCES:
1212                 if (gdeleted || !psf->sf_crcount)
1213                         return 0;
1214                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1215         case MLD2_BLOCK_OLD_SOURCES:
1216                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1217                         return gdeleted || (psf->sf_crcount && sdeleted);
1218                 return psf->sf_crcount && !gdeleted && !sdeleted;
1219         }
1220         return 0;
1221 }
1222
1223 static int
1224 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1225 {
1226         struct ip6_sf_list *psf;
1227         int scount = 0;
1228
1229         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1230                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1231                         continue;
1232                 scount++;
1233         }
1234         return scount;
1235 }
1236
1237 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1238 {
1239         struct sock *sk = igmp6_socket->sk;
1240         struct sk_buff *skb;
1241         struct mld2_report *pmr;
1242         struct in6_addr addr_buf;
1243         int err;
1244         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1245                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1246                      IPV6_TLV_PADN, 0 };
1247
1248         skb = sock_alloc_send_skb(sk, size + dev->hard_header_len+15, 1, &err);
1249
1250         if (skb == 0)
1251                 return 0;
1252
1253         skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1254
1255         if (ipv6_get_lladdr(dev, &addr_buf)) {
1256                 /* <draft-ietf-magma-mld-source-02.txt>:
1257                  * use unspecified address as the source address
1258                  * when a valid link-local address is not available.
1259                  */
1260                 memset(&addr_buf, 0, sizeof(addr_buf));
1261         }
1262
1263         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1264
1265         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1266
1267         pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1268         skb->h.raw = (unsigned char *)pmr;
1269         pmr->type = ICMPV6_MLD2_REPORT;
1270         pmr->resv1 = 0;
1271         pmr->csum = 0;
1272         pmr->resv2 = 0;
1273         pmr->ngrec = 0;
1274         return skb;
1275 }
1276
1277 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1278 {
1279         struct net_device *dev = skb->dev;
1280
1281         if (dev->hard_header) {
1282                 unsigned char ha[MAX_ADDR_LEN];
1283                 int err;
1284
1285                 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1286                 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1287                 if (err < 0) {
1288                         kfree_skb(skb);
1289                         return err;
1290                 }
1291         }
1292         return dev_queue_xmit(skb);
1293 }
1294
1295 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1296 {
1297         return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1298                        mld_dev_queue_xmit2);
1299 }
1300
1301 static void mld_sendpack(struct sk_buff *skb)
1302 {
1303         struct ipv6hdr *pip6 = skb->nh.ipv6h;
1304         struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1305         int payload_len, mldlen, err;
1306
1307         payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1308                 sizeof(struct ipv6hdr);
1309         mldlen = skb->tail - skb->h.raw;
1310         pip6->payload_len = htons(payload_len);
1311
1312         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1313                 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1314         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1315                       mld_dev_queue_xmit);
1316         if (!err)
1317                 ICMP6_INC_STATS(Icmp6OutMsgs);
1318 }
1319
1320 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1321 {
1322         return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel);
1323 }
1324
1325 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1326         int type, struct mld2_grec **ppgr)
1327 {
1328         struct net_device *dev = pmc->idev->dev;
1329         struct mld2_report *pmr;
1330         struct mld2_grec *pgr;
1331
1332         if (!skb)
1333                 skb = mld_newpack(dev, dev->mtu);
1334         if (!skb)
1335                 return 0;
1336         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1337         pgr->grec_type = type;
1338         pgr->grec_auxwords = 0;
1339         pgr->grec_nsrcs = 0;
1340         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1341         pmr = (struct mld2_report *)skb->h.raw;
1342         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1343         *ppgr = pgr;
1344         return skb;
1345 }
1346
1347 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1348         skb_tailroom(skb)) : 0)
1349
1350 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1351         int type, int gdeleted, int sdeleted)
1352 {
1353         struct net_device *dev = pmc->idev->dev;
1354         struct mld2_report *pmr;
1355         struct mld2_grec *pgr = 0;
1356         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1357         int scount, first, isquery, truncate;
1358
1359         if (pmc->mca_flags & MAF_NOREPORT)
1360                 return skb;
1361
1362         isquery = type == MLD2_MODE_IS_INCLUDE ||
1363                   type == MLD2_MODE_IS_EXCLUDE;
1364         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1365                     type == MLD2_CHANGE_TO_EXCLUDE;
1366
1367         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1368
1369         if (!*psf_list) {
1370                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1371                     type == MLD2_BLOCK_OLD_SOURCES)
1372                         return skb;
1373                 if (pmc->mca_crcount || isquery) {
1374                         /* make sure we have room for group header and at
1375                          * least one source.
1376                          */
1377                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1378                             sizeof(struct in6_addr)) {
1379                                 mld_sendpack(skb);
1380                                 skb = 0; /* add_grhead will get a new one */
1381                         }
1382                         skb = add_grhead(skb, pmc, type, &pgr);
1383                 }
1384                 return skb;
1385         }
1386         pmr = skb ? (struct mld2_report *)skb->h.raw : 0;
1387
1388         /* EX and TO_EX get a fresh packet, if needed */
1389         if (truncate) {
1390                 if (pmr && pmr->ngrec &&
1391                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1392                         if (skb)
1393                                 mld_sendpack(skb);
1394                         skb = mld_newpack(dev, dev->mtu);
1395                 }
1396         }
1397         first = 1;
1398         scount = 0;
1399         psf_prev = 0;
1400         for (psf=*psf_list; psf; psf=psf_next) {
1401                 struct in6_addr *psrc;
1402
1403                 psf_next = psf->sf_next;
1404
1405                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1406                         psf_prev = psf;
1407                         continue;
1408                 }
1409
1410                 /* clear marks on query responses */
1411                 if (isquery)
1412                         psf->sf_gsresp = 0;
1413
1414                 if (AVAILABLE(skb) < sizeof(*psrc) +
1415                     first*sizeof(struct mld2_grec)) {
1416                         if (truncate && !first)
1417                                 break;   /* truncate these */
1418                         if (pgr)
1419                                 pgr->grec_nsrcs = htons(scount);
1420                         if (skb)
1421                                 mld_sendpack(skb);
1422                         skb = mld_newpack(dev, dev->mtu);
1423                         first = 1;
1424                         scount = 0;
1425                 }
1426                 if (first) {
1427                         skb = add_grhead(skb, pmc, type, &pgr);
1428                         first = 0;
1429                 }
1430                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1431                 *psrc = psf->sf_addr;
1432                 scount++;
1433                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1434                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1435                         psf->sf_crcount--;
1436                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1437                                 if (psf_prev)
1438                                         psf_prev->sf_next = psf->sf_next;
1439                                 else
1440                                         *psf_list = psf->sf_next;
1441                                 kfree(psf);
1442                                 continue;
1443                         }
1444                 }
1445                 psf_prev = psf;
1446         }
1447         if (pgr)
1448                 pgr->grec_nsrcs = htons(scount);
1449
1450         if (isquery)
1451                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1452         return skb;
1453 }
1454
1455 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1456 {
1457         struct sk_buff *skb = 0;
1458         int type;
1459
1460         if (!pmc) {
1461                 read_lock_bh(&idev->lock);
1462                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1463                         if (pmc->mca_flags & MAF_NOREPORT)
1464                                 continue;
1465                         spin_lock_bh(&pmc->mca_lock);
1466                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1467                                 type = MLD2_MODE_IS_EXCLUDE;
1468                         else
1469                                 type = MLD2_MODE_IS_INCLUDE;
1470                         skb = add_grec(skb, pmc, type, 0, 0);
1471                         spin_unlock_bh(&pmc->mca_lock);
1472                 }
1473                 read_unlock_bh(&idev->lock);
1474         } else {
1475                 spin_lock_bh(&pmc->mca_lock);
1476                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1477                         type = MLD2_MODE_IS_EXCLUDE;
1478                 else
1479                         type = MLD2_MODE_IS_INCLUDE;
1480                 skb = add_grec(skb, pmc, type, 0, 0);
1481                 spin_unlock_bh(&pmc->mca_lock);
1482         }
1483         if (skb)
1484                 mld_sendpack(skb);
1485 }
1486
1487 /*
1488  * remove zero-count source records from a source filter list
1489  */
1490 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1491 {
1492         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1493
1494         psf_prev = 0;
1495         for (psf=*ppsf; psf; psf = psf_next) {
1496                 psf_next = psf->sf_next;
1497                 if (psf->sf_crcount == 0) {
1498                         if (psf_prev)
1499                                 psf_prev->sf_next = psf->sf_next;
1500                         else
1501                                 *ppsf = psf->sf_next;
1502                         kfree(psf);
1503                 } else
1504                         psf_prev = psf;
1505         }
1506 }
1507
1508 static void mld_send_cr(struct inet6_dev *idev)
1509 {
1510         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1511         struct sk_buff *skb = 0;
1512         int type, dtype;
1513
1514         read_lock_bh(&idev->lock);
1515         write_lock_bh(&idev->mc_lock);
1516
1517         /* deleted MCA's */
1518         pmc_prev = 0;
1519         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1520                 pmc_next = pmc->next;
1521                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1522                         type = MLD2_BLOCK_OLD_SOURCES;
1523                         dtype = MLD2_BLOCK_OLD_SOURCES;
1524                         skb = add_grec(skb, pmc, type, 1, 0);
1525                         skb = add_grec(skb, pmc, dtype, 1, 1);
1526                 }
1527                 if (pmc->mca_crcount) {
1528                         pmc->mca_crcount--;
1529                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1530                                 type = MLD2_CHANGE_TO_INCLUDE;
1531                                 skb = add_grec(skb, pmc, type, 1, 0);
1532                         }
1533                         if (pmc->mca_crcount == 0) {
1534                                 mld_clear_zeros(&pmc->mca_tomb);
1535                                 mld_clear_zeros(&pmc->mca_sources);
1536                         }
1537                 }
1538                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1539                     !pmc->mca_sources) {
1540                         if (pmc_prev)
1541                                 pmc_prev->next = pmc_next;
1542                         else
1543                                 idev->mc_tomb = pmc_next;
1544                         in6_dev_put(pmc->idev);
1545                         kfree(pmc);
1546                 } else
1547                         pmc_prev = pmc;
1548         }
1549         write_unlock_bh(&idev->mc_lock);
1550
1551         /* change recs */
1552         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1553                 spin_lock_bh(&pmc->mca_lock);
1554                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1555                         type = MLD2_BLOCK_OLD_SOURCES;
1556                         dtype = MLD2_ALLOW_NEW_SOURCES;
1557                 } else {
1558                         type = MLD2_ALLOW_NEW_SOURCES;
1559                         dtype = MLD2_BLOCK_OLD_SOURCES;
1560                 }
1561                 skb = add_grec(skb, pmc, type, 0, 0);
1562                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1563
1564                 /* filter mode changes */
1565                 if (pmc->mca_crcount) {
1566                         pmc->mca_crcount--;
1567                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1568                                 type = MLD2_CHANGE_TO_EXCLUDE;
1569                         else
1570                                 type = MLD2_CHANGE_TO_INCLUDE;
1571                         skb = add_grec(skb, pmc, type, 0, 0);
1572                 }
1573                 spin_unlock_bh(&pmc->mca_lock);
1574         }
1575         read_unlock_bh(&idev->lock);
1576         if (!skb)
1577                 return;
1578         (void) mld_sendpack(skb);
1579 }
1580
1581 void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1582 {
1583         struct sock *sk = igmp6_socket->sk;
1584         struct sk_buff *skb;
1585         struct icmp6hdr *hdr;
1586         struct in6_addr *snd_addr;
1587         struct in6_addr *addrp;
1588         struct in6_addr addr_buf;
1589         struct in6_addr all_routers;
1590         int err, len, payload_len, full_len;
1591         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1592                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1593                      IPV6_TLV_PADN, 0 };
1594
1595         snd_addr = addr;
1596         if (type == ICMPV6_MGM_REDUCTION) {
1597                 snd_addr = &all_routers;
1598                 ipv6_addr_all_routers(&all_routers);
1599         }
1600
1601         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1602         payload_len = len + sizeof(ra);
1603         full_len = sizeof(struct ipv6hdr) + payload_len;
1604
1605         skb = sock_alloc_send_skb(sk, dev->hard_header_len + full_len + 15, 1, &err);
1606
1607         if (skb == NULL)
1608                 return;
1609
1610         skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1611
1612         if (ipv6_get_lladdr(dev, &addr_buf)) {
1613                 /* <draft-ietf-magma-mld-source-02.txt>:
1614                  * use unspecified address as the source address
1615                  * when a valid link-local address is not available.
1616                  */
1617                 memset(&addr_buf, 0, sizeof(addr_buf));
1618         }
1619
1620         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1621
1622         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1623
1624         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1625         memset(hdr, 0, sizeof(struct icmp6hdr));
1626         hdr->icmp6_type = type;
1627
1628         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1629         ipv6_addr_copy(addrp, addr);
1630
1631         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1632                                            IPPROTO_ICMPV6,
1633                                            csum_partial((__u8 *) hdr, len, 0));
1634
1635         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1636                       mld_dev_queue_xmit);
1637         if (!err) {
1638                 if (type == ICMPV6_MGM_REDUCTION)
1639                         ICMP6_INC_STATS(Icmp6OutGroupMembReductions);
1640                 else
1641                         ICMP6_INC_STATS(Icmp6OutGroupMembResponses);
1642                 ICMP6_INC_STATS(Icmp6OutMsgs);
1643         }
1644
1645         return;
1646 }
1647
1648 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1649         struct in6_addr *psfsrc)
1650 {
1651         struct ip6_sf_list *psf, *psf_prev;
1652         int rv = 0;
1653
1654         psf_prev = 0;
1655         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1656                 if (ipv6_addr_cmp(&psf->sf_addr, psfsrc) == 0)
1657                         break;
1658                 psf_prev = psf;
1659         }
1660         if (!psf || psf->sf_count[sfmode] == 0) {
1661                 /* source filter not found, or count wrong =>  bug */
1662                 return -ESRCH;
1663         }
1664         psf->sf_count[sfmode]--;
1665         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1666                 struct inet6_dev *idev = pmc->idev;
1667
1668                 /* no more filters for this source */
1669                 if (psf_prev)
1670                         psf_prev->sf_next = psf->sf_next;
1671                 else
1672                         pmc->mca_sources = psf->sf_next;
1673                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1674                     !MLD_V1_SEEN(idev)) {
1675                         psf->sf_crcount = idev->mc_qrv;
1676                         psf->sf_next = pmc->mca_tomb;
1677                         pmc->mca_tomb = psf;
1678                         rv = 1;
1679                 } else
1680                         kfree(psf);
1681         }
1682         return rv;
1683 }
1684
1685 int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, int sfmode,
1686         int sfcount, struct in6_addr *psfsrc, int delta)
1687 {
1688         struct ifmcaddr6 *pmc;
1689         int     changerec = 0;
1690         int     i, err;
1691
1692         if (!idev)
1693                 return -ENODEV;
1694         read_lock_bh(&idev->lock);
1695         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1696                 if (ipv6_addr_cmp(pmca, &pmc->mca_addr) == 0)
1697                         break;
1698         }
1699         if (!pmc) {
1700                 /* MCA not found?? bug */
1701                 read_unlock_bh(&idev->lock);
1702                 return -ESRCH;
1703         }
1704         spin_lock_bh(&pmc->mca_lock);
1705         sf_markstate(pmc);
1706         if (!delta) {
1707                 if (!pmc->mca_sfcount[sfmode]) {
1708                         spin_unlock_bh(&pmc->mca_lock);
1709                         read_unlock_bh(&idev->lock);
1710                         return -EINVAL;
1711                 }
1712                 pmc->mca_sfcount[sfmode]--;
1713         }
1714         err = 0;
1715         for (i=0; i<sfcount; i++) {
1716                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1717
1718                 changerec |= rv > 0;
1719                 if (!err && rv < 0)
1720                         err = rv;
1721         }
1722         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1723             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1724             pmc->mca_sfcount[MCAST_INCLUDE]) {
1725                 struct ip6_sf_list *psf;
1726
1727                 /* filter mode change */
1728                 pmc->mca_sfmode = MCAST_INCLUDE;
1729                 pmc->mca_crcount = idev->mc_qrv;
1730                 idev->mc_ifc_count = pmc->mca_crcount;
1731                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1732                         psf->sf_crcount = 0;
1733                 mld_ifc_event(pmc->idev);
1734         } else if (sf_setstate(pmc) || changerec)
1735                 mld_ifc_event(pmc->idev);
1736         spin_unlock_bh(&pmc->mca_lock);
1737         read_unlock_bh(&idev->lock);
1738         return err;
1739 }
1740
1741 /*
1742  * Add multicast single-source filter to the interface list
1743  */
1744 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1745         struct in6_addr *psfsrc, int delta)
1746 {
1747         struct ip6_sf_list *psf, *psf_prev;
1748
1749         psf_prev = 0;
1750         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1751                 if (ipv6_addr_cmp(&psf->sf_addr, psfsrc) == 0)
1752                         break;
1753                 psf_prev = psf;
1754         }
1755         if (!psf) {
1756                 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1757                 if (!psf)
1758                         return -ENOBUFS;
1759                 memset(psf, 0, sizeof(*psf));
1760                 psf->sf_addr = *psfsrc;
1761                 if (psf_prev) {
1762                         psf_prev->sf_next = psf;
1763                 } else
1764                         pmc->mca_sources = psf;
1765         }
1766         psf->sf_count[sfmode]++;
1767         return 0;
1768 }
1769
1770 static void sf_markstate(struct ifmcaddr6 *pmc)
1771 {
1772         struct ip6_sf_list *psf;
1773         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1774
1775         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1776                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1777                         psf->sf_oldin = mca_xcount ==
1778                                 psf->sf_count[MCAST_EXCLUDE] &&
1779                                 !psf->sf_count[MCAST_INCLUDE];
1780                 } else
1781                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1782 }
1783
1784 static int sf_setstate(struct ifmcaddr6 *pmc)
1785 {
1786         struct ip6_sf_list *psf;
1787         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1788         int qrv = pmc->idev->mc_qrv;
1789         int new_in, rv;
1790
1791         rv = 0;
1792         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1793                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1794                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1795                                 !psf->sf_count[MCAST_INCLUDE];
1796                 } else
1797                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1798                 if (new_in != psf->sf_oldin) {
1799                         psf->sf_crcount = qrv;
1800                         rv++;
1801                 }
1802         }
1803         return rv;
1804 }
1805
1806 /*
1807  * Add multicast source filter list to the interface list
1808  */
1809 int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, int sfmode,
1810         int sfcount, struct in6_addr *psfsrc, int delta)
1811 {
1812         struct ifmcaddr6 *pmc;
1813         int     isexclude;
1814         int     i, err;
1815
1816         if (!idev)
1817                 return -ENODEV;
1818         read_lock_bh(&idev->lock);
1819         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1820                 if (ipv6_addr_cmp(pmca, &pmc->mca_addr) == 0)
1821                         break;
1822         }
1823         if (!pmc) {
1824                 /* MCA not found?? bug */
1825                 read_unlock_bh(&idev->lock);
1826                 return -ESRCH;
1827         }
1828         spin_lock_bh(&pmc->mca_lock);
1829
1830         sf_markstate(pmc);
1831         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1832         if (!delta)
1833                 pmc->mca_sfcount[sfmode]++;
1834         err = 0;
1835         for (i=0; i<sfcount; i++) {
1836                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1837                 if (err)
1838                         break;
1839         }
1840         if (err) {
1841                 int j;
1842
1843                 pmc->mca_sfcount[sfmode]--;
1844                 for (j=0; j<i; j++)
1845                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1846         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1847                 struct inet6_dev *idev = pmc->idev;
1848                 struct ip6_sf_list *psf;
1849
1850                 /* filter mode change */
1851                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1852                         pmc->mca_sfmode = MCAST_EXCLUDE;
1853                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
1854                         pmc->mca_sfmode = MCAST_INCLUDE;
1855                 /* else no filters; keep old mode for reports */
1856
1857                 pmc->mca_crcount = idev->mc_qrv;
1858                 idev->mc_ifc_count = pmc->mca_crcount;
1859                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1860                         psf->sf_crcount = 0;
1861                 mld_ifc_event(idev);
1862         } else if (sf_setstate(pmc))
1863                 mld_ifc_event(idev);
1864         spin_unlock_bh(&pmc->mca_lock);
1865         read_unlock_bh(&idev->lock);
1866         return err;
1867 }
1868
1869 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1870 {
1871         struct ip6_sf_list *psf, *nextpsf;
1872
1873         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1874                 nextpsf = psf->sf_next;
1875                 kfree(psf);
1876         }
1877         pmc->mca_tomb = 0;
1878         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1879                 nextpsf = psf->sf_next;
1880                 kfree(psf);
1881         }
1882         pmc->mca_sources = 0;
1883         pmc->mca_sfmode = MCAST_EXCLUDE;
1884         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1885         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1886 }
1887
1888 static void igmp6_join_group(struct ifmcaddr6 *ma)
1889 {
1890         unsigned long delay;
1891
1892         if (ma->mca_flags & MAF_NOREPORT)
1893                 return;
1894
1895         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
1896
1897         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
1898
1899         spin_lock_bh(&ma->mca_lock);
1900         if (del_timer(&ma->mca_timer)) {
1901                 atomic_dec(&ma->mca_refcnt);
1902                 delay = ma->mca_timer.expires - jiffies;
1903         }
1904
1905         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1906                 atomic_inc(&ma->mca_refcnt);
1907         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
1908         spin_unlock_bh(&ma->mca_lock);
1909 }
1910
1911 int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
1912         struct inet6_dev *idev)
1913 {
1914         int err;
1915
1916         if (iml->sflist == 0) {
1917                 /* any-source empty exclude case */
1918                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, 0, 0);
1919         }
1920         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
1921                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
1922         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
1923         iml->sflist = 0;
1924         return err;
1925 }
1926
1927 static void igmp6_leave_group(struct ifmcaddr6 *ma)
1928 {
1929         if (MLD_V1_SEEN(ma->idev)) {
1930                 if (ma->mca_flags & MAF_LAST_REPORTER)
1931                         igmp6_send(&ma->mca_addr, ma->idev->dev,
1932                                 ICMPV6_MGM_REDUCTION);
1933         } else {
1934                 mld_add_delrec(ma->idev, ma);
1935                 mld_ifc_event(ma->idev);
1936         }
1937 }
1938
1939 static void mld_gq_timer_expire(unsigned long data)
1940 {
1941         struct inet6_dev *idev = (struct inet6_dev *)data;
1942
1943         idev->mc_gq_running = 0;
1944         mld_send_report(idev, 0);
1945         __in6_dev_put(idev);
1946 }
1947
1948 static void mld_ifc_timer_expire(unsigned long data)
1949 {
1950         struct inet6_dev *idev = (struct inet6_dev *)data;
1951
1952         mld_send_cr(idev);
1953         if (idev->mc_ifc_count) {
1954                 idev->mc_ifc_count--;
1955                 if (idev->mc_ifc_count)
1956                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
1957         }
1958         __in6_dev_put(idev);
1959 }
1960
1961 static void mld_ifc_event(struct inet6_dev *idev)
1962 {
1963         if (MLD_V1_SEEN(idev))
1964                 return;
1965         idev->mc_ifc_count = idev->mc_qrv;
1966         mld_ifc_start_timer(idev, 1);
1967 }
1968
1969
1970 static void igmp6_timer_handler(unsigned long data)
1971 {
1972         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
1973
1974         if (MLD_V1_SEEN(ma->idev))
1975                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
1976         else
1977                 mld_send_report(ma->idev, ma);
1978
1979         spin_lock(&ma->mca_lock);
1980         ma->mca_flags |=  MAF_LAST_REPORTER;
1981         ma->mca_flags &= ~MAF_TIMER_RUNNING;
1982         spin_unlock(&ma->mca_lock);
1983         ma_put(ma);
1984 }
1985
1986 /* Device going down */
1987
1988 void ipv6_mc_down(struct inet6_dev *idev)
1989 {
1990         struct ifmcaddr6 *i;
1991
1992         /* Withdraw multicast list */
1993
1994         read_lock_bh(&idev->lock);
1995         idev->mc_ifc_count = 0;
1996         if (del_timer(&idev->mc_ifc_timer))
1997                 __in6_dev_put(idev);
1998         idev->mc_gq_running = 0;
1999         if (del_timer(&idev->mc_gq_timer))
2000                 __in6_dev_put(idev);
2001
2002         for (i = idev->mc_list; i; i=i->next)
2003                 igmp6_group_dropped(i);
2004         read_unlock_bh(&idev->lock);
2005
2006         mld_clear_delrec(idev);
2007 }
2008
2009
2010 /* Device going up */
2011
2012 void ipv6_mc_up(struct inet6_dev *idev)
2013 {
2014         struct ifmcaddr6 *i;
2015
2016         /* Install multicast list, except for all-nodes (already installed) */
2017
2018         read_lock_bh(&idev->lock);
2019         for (i = idev->mc_list; i; i=i->next)
2020                 igmp6_group_added(i);
2021         read_unlock_bh(&idev->lock);
2022 }
2023
2024 /* IPv6 device initialization. */
2025
2026 void ipv6_mc_init_dev(struct inet6_dev *idev)
2027 {
2028         struct in6_addr maddr;
2029
2030         write_lock_bh(&idev->lock);
2031         idev->mc_lock = RW_LOCK_UNLOCKED;
2032         idev->mc_gq_running = 0;
2033         init_timer(&idev->mc_gq_timer);
2034         idev->mc_gq_timer.data = (unsigned long) idev;
2035         idev->mc_gq_timer.function = &mld_gq_timer_expire;
2036         idev->mc_tomb = 0;
2037         idev->mc_ifc_count = 0;
2038         init_timer(&idev->mc_ifc_timer);
2039         idev->mc_ifc_timer.data = (unsigned long) idev;
2040         idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2041         idev->mc_qrv = MLD_QRV_DEFAULT;
2042         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2043         idev->mc_v1_seen = 0;
2044         write_unlock_bh(&idev->lock);
2045
2046         /* Add all-nodes address. */
2047         ipv6_addr_all_nodes(&maddr);
2048         ipv6_dev_mc_inc(idev->dev, &maddr);
2049 }
2050
2051 /*
2052  *      Device is about to be destroyed: clean up.
2053  */
2054
2055 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2056 {
2057         struct ifmcaddr6 *i;
2058         struct in6_addr maddr;
2059
2060         /* Deactivate timers */
2061         ipv6_mc_down(idev);
2062
2063         /* Delete all-nodes address. */
2064         ipv6_addr_all_nodes(&maddr);
2065
2066         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2067          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2068          * fail.
2069          */
2070         __ipv6_dev_mc_dec(idev->dev, idev, &maddr);
2071
2072         write_lock_bh(&idev->lock);
2073         while ((i = idev->mc_list) != NULL) {
2074                 idev->mc_list = i->next;
2075                 write_unlock_bh(&idev->lock);
2076
2077                 igmp6_group_dropped(i);
2078                 ma_put(i);
2079
2080                 write_lock_bh(&idev->lock);
2081         }
2082         write_unlock_bh(&idev->lock);
2083 }
2084
2085 #ifdef CONFIG_PROC_FS
2086 static int igmp6_read_proc(char *buffer, char **start, off_t offset,
2087                            int length, int *eof, void *data)
2088 {
2089         off_t pos=0, begin=0;
2090         struct ifmcaddr6 *im;
2091         int len=0;
2092         struct net_device *dev;
2093
2094         read_lock(&dev_base_lock);
2095         for (dev = dev_base; dev; dev = dev->next) {
2096                 struct inet6_dev *idev;
2097
2098                 if ((idev = in6_dev_get(dev)) == NULL)
2099                         continue;
2100
2101                 read_lock_bh(&idev->lock);
2102                 for (im = idev->mc_list; im; im = im->next) {
2103                         int i;
2104
2105                         len += sprintf(buffer+len,"%-4d %-15s ", dev->ifindex, dev->name);
2106
2107                         for (i=0; i<16; i++)
2108                                 len += sprintf(buffer+len, "%02x", im->mca_addr.s6_addr[i]);
2109
2110                         len+=sprintf(buffer+len,
2111                                      " %5d %08X %ld\n",
2112                                      im->mca_users,
2113                                      im->mca_flags,
2114                                      (im->mca_flags&MAF_TIMER_RUNNING) ? im->mca_timer.expires-jiffies : 0);
2115
2116                         pos=begin+len;
2117                         if (pos < offset) {
2118                                 len=0;
2119                                 begin=pos;
2120                         }
2121                         if (pos > offset+length) {
2122                                 read_unlock_bh(&idev->lock);
2123                                 in6_dev_put(idev);
2124                                 goto done;
2125                         }
2126                 }
2127                 read_unlock_bh(&idev->lock);
2128                 in6_dev_put(idev);
2129         }
2130         *eof = 1;
2131
2132 done:
2133         read_unlock(&dev_base_lock);
2134
2135         *start=buffer+(offset-begin);
2136         len-=(offset-begin);
2137         if(len>length)
2138                 len=length;
2139         if (len<0)
2140                 len=0;
2141         return len;
2142 }
2143
2144 static int ip6_mcf_read_proc(char *buffer, char **start, off_t offset,
2145                            int length, int *eof, void *data)
2146 {
2147         off_t pos=0, begin=0;
2148         int len=0;
2149         int first=1;
2150         struct net_device *dev;
2151
2152         read_lock(&dev_base_lock);
2153         for (dev=dev_base; dev; dev=dev->next) {
2154                 struct inet6_dev *idev = in6_dev_get(dev);
2155                 struct ifmcaddr6 *imc;
2156
2157                 if (idev == NULL)
2158                         continue;
2159
2160                 read_lock_bh(&idev->lock);
2161
2162                 for (imc=idev->mc_list; imc; imc=imc->next) {
2163                         struct ip6_sf_list *psf;
2164                         unsigned long i;
2165
2166                         spin_lock_bh(&imc->mca_lock);
2167                         for (psf=imc->mca_sources; psf; psf=psf->sf_next) {
2168                                 if (first) {
2169                                         len += sprintf(buffer+len, "%3s %6s "
2170                                                 "%32s %32s %6s %6s\n", "Idx",
2171                                                 "Device", "Multicast Address",
2172                                                 "Source Address", "INC", "EXC");
2173                                         first = 0;
2174                                 }
2175                                 len += sprintf(buffer+len,"%3d %6.6s ",
2176                                         dev->ifindex, dev->name);
2177
2178                                 for (i=0; i<16; i++)
2179                                         len += sprintf(buffer+len, "%02x",
2180                                                 imc->mca_addr.s6_addr[i]);
2181                                 buffer[len++] = ' ';
2182                                 for (i=0; i<16; i++)
2183                                         len += sprintf(buffer+len, "%02x",
2184                                                 psf->sf_addr.s6_addr[i]);
2185                                 len += sprintf(buffer+len, " %6lu %6lu\n",
2186                                         psf->sf_count[MCAST_INCLUDE],
2187                                         psf->sf_count[MCAST_EXCLUDE]);
2188                                 pos = begin+len;
2189                                 if (pos < offset) {
2190                                         len=0;
2191                                         begin=pos;
2192                                 }
2193                                 if (pos > offset+length) {
2194                                         spin_unlock_bh(&imc->mca_lock);
2195                                         read_unlock_bh(&idev->lock);
2196                                         in6_dev_put(idev);
2197                                         goto done;
2198                                 }
2199                         }
2200                         spin_unlock_bh(&imc->mca_lock);
2201                 }
2202                 read_unlock_bh(&idev->lock);
2203                 in6_dev_put(idev);
2204         }
2205         *eof = 1;
2206
2207 done:
2208         read_unlock(&dev_base_lock);
2209
2210         *start=buffer+(offset-begin);
2211         len-=(offset-begin);
2212         if(len>length)
2213                 len=length;
2214         if (len<0)
2215                 len=0;
2216         return len;
2217 }
2218 #endif
2219
2220 int __init igmp6_init(struct net_proto_family *ops)
2221 {
2222         struct sock *sk;
2223         int err;
2224
2225         igmp6_socket = sock_alloc();
2226         if (igmp6_socket == NULL) {
2227                 printk(KERN_ERR
2228                        "Failed to create the IGMP6 control socket.\n");
2229                 return -1;
2230         }
2231         igmp6_socket->inode->i_uid = 0;
2232         igmp6_socket->inode->i_gid = 0;
2233         igmp6_socket->type = SOCK_RAW;
2234
2235         if((err = ops->create(igmp6_socket, IPPROTO_ICMPV6)) < 0) {
2236                 printk(KERN_DEBUG
2237                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2238                        err);
2239                 sock_release(igmp6_socket);
2240                 igmp6_socket = NULL; /* For safety. */
2241                 return err;
2242         }
2243
2244         sk = igmp6_socket->sk;
2245         sk->allocation = GFP_ATOMIC;
2246         sk->prot->unhash(sk);
2247
2248         sk->net_pinfo.af_inet6.hop_limit = 1;
2249 #ifdef CONFIG_PROC_FS
2250         create_proc_read_entry("net/igmp6", 0, 0, igmp6_read_proc, NULL);
2251         create_proc_read_entry("net/mcfilter6", 0, 0, ip6_mcf_read_proc, NULL);
2252 #endif
2253
2254         return 0;
2255 }
2256
2257 void igmp6_cleanup(void)
2258 {
2259         sock_release(igmp6_socket);
2260         igmp6_socket = NULL; /* for safety */
2261 #ifdef CONFIG_PROC_FS
2262         remove_proc_entry("net/igmp6", 0);
2263 #endif
2264 }