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   1 /* SCTP kernel reference Implementation
   2  * (C) Copyright IBM Corp. 2002, 2004
   3  * Copyright (c) 2001 Nokia, Inc.
   4  * Copyright (c) 2001 La Monte H.P. Yarroll
   5  * Copyright (c) 2002-2003 Intel Corp.
   6  *
   7  * This file is part of the SCTP kernel reference Implementation
   8  *
   9  * SCTP over IPv6.
  10  *
  11  * The SCTP reference implementation is free software;
  12  * you can redistribute it and/or modify it under the terms of
  13  * the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2, or (at your option)
  15  * any later version.
  16  *
  17  * The SCTP reference implementation is distributed in the hope that it
  18  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  19  *                 ************************
  20  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  21  * See the GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with GNU CC; see the file COPYING.  If not, write to
  25  * the Free Software Foundation, 59 Temple Place - Suite 330,
  26  * Boston, MA 02111-1307, USA.
  27  *
  28  * Please send any bug reports or fixes you make to the
  29  * email address(es):
  30  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  31  *
  32  * Or submit a bug report through the following website:
  33  *    http://www.sf.net/projects/lksctp
  34  *
  35  * Written or modified by:
  36  *    Le Yanqun             <yanqun.le@nokia.com>
  37  *    Hui Huang             <hui.huang@nokia.com>
  38  *    La Monte H.P. Yarroll <piggy@acm.org>
  39  *    Sridhar Samudrala     <sri@us.ibm.com>
  40  *    Jon Grimm             <jgrimm@us.ibm.com>
  41  *    Ardelle Fan           <ardelle.fan@intel.com>
  42  *
  43  * Based on:
  44  *      linux/net/ipv6/tcp_ipv6.c
  45  *
  46  * Any bugs reported given to us we will try to fix... any fixes shared will
  47  * be incorporated into the next SCTP release.
  48  */
  49
  50 #include <linux/module.h>
  51 #include <linux/errno.h>
  52 #include <linux/types.h>
  53 #include <linux/socket.h>
  54 #include <linux/sockios.h>
  55 #include <linux/net.h>
  56 #include <linux/in.h>
  57 #include <linux/in6.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/init.h>
  60 #include <linux/ipsec.h>
  61
  62 #include <linux/ipv6.h>
  63 #include <linux/icmpv6.h>
  64 #include <linux/random.h>
  65 #include <linux/seq_file.h>
  66
  67 #include <net/protocol.h>
  68 #include <net/ndisc.h>
  69 #include <net/ip.h>
  70 #include <net/ipv6.h>
  71 #include <net/transp_v6.h>
  72 #include <net/addrconf.h>
  73 #include <net/ip6_route.h>
  74 #include <net/inet_common.h>
  75 #include <net/inet_ecn.h>
  76 #include <net/sctp/sctp.h>
  77
  78 #include <asm/uaccess.h>
  79
  80 /* Event handler for inet6 address addition/deletion events.  */
  81 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
  82                                 void *ptr)
  83 {
  84         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
  85         struct sctp_sockaddr_entry *addr;
  86         struct list_head *pos, *temp;
  87
  88         switch (ev) {
  89         case NETDEV_UP:
  90                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
  91                 if (addr) {
  92                         addr->a.v6.sin6_family = AF_INET6;
  93                         addr->a.v6.sin6_port = 0;
  94                         memcpy(&addr->a.v6.sin6_addr, &ifa->addr,
  95                                  sizeof(struct in6_addr));
  96                         addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
  97                         list_add_tail(&addr->list, &sctp_local_addr_list);
  98                 }
  99                 break;
 100         case NETDEV_DOWN:
 101                 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 102                         addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 103                         if (ipv6_addr_equal(&addr->a.v6.sin6_addr, &ifa->addr)) {
 104                                 list_del(pos);
 105                                 kfree(addr);
 106                                 break;
 107                         }
 108                 }
 109
 110                 break;
 111         }
 112
 113         return NOTIFY_DONE;
 114 }
 115
 116 static struct notifier_block sctp_inet6addr_notifier = {
 117         .notifier_call = sctp_inet6addr_event,
 118 };
 119
 120 /* ICMP error handler. */
 121 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 122                              int type, int code, int offset, __be32 info)
 123 {
 124         struct inet6_dev *idev;
 125         struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
 126         struct sock *sk;
 127         struct sctp_association *asoc;
 128         struct sctp_transport *transport;
 129         struct ipv6_pinfo *np;
 130         char *saveip, *savesctp;
 131         int err;
 132
 133         idev = in6_dev_get(skb->dev);
 134
 135         /* Fix up skb to look at the embedded net header. */
 136         saveip = skb->nh.raw;
 137         savesctp  = skb->h.raw;
 138         skb_reset_network_header(skb);
 139         skb->h.raw = (char *)sh;
 140         sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport);
 141         /* Put back, the original pointers. */
 142         skb->nh.raw = saveip;
 143         skb->h.raw = savesctp;
 144         if (!sk) {
 145                 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
 146                 goto out;
 147         }
 148
 149         /* Warning:  The sock lock is held.  Remember to call
 150          * sctp_err_finish!
 151          */
 152
 153         switch (type) {
 154         case ICMPV6_PKT_TOOBIG:
 155                 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
 156                 goto out_unlock;
 157         case ICMPV6_PARAMPROB:
 158                 if (ICMPV6_UNK_NEXTHDR == code) {
 159                         sctp_icmp_proto_unreachable(sk, asoc, transport);
 160                         goto out_unlock;
 161                 }
 162                 break;
 163         default:
 164                 break;
 165         }
 166
 167         np = inet6_sk(sk);
 168         icmpv6_err_convert(type, code, &err);
 169         if (!sock_owned_by_user(sk) && np->recverr) {
 170                 sk->sk_err = err;
 171                 sk->sk_error_report(sk);
 172         } else {  /* Only an error on timeout */
 173                 sk->sk_err_soft = err;
 174         }
 175
 176 out_unlock:
 177         sctp_err_finish(sk, asoc);
 178 out:
 179         if (likely(idev != NULL))
 180                 in6_dev_put(idev);
 181 }
 182
 183 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
 184 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
 185                         int ipfragok)
 186 {
 187         struct sock *sk = skb->sk;
 188         struct ipv6_pinfo *np = inet6_sk(sk);
 189         struct flowi fl;
 190
 191         memset(&fl, 0, sizeof(fl));
 192
 193         fl.proto = sk->sk_protocol;
 194
 195         /* Fill in the dest address from the route entry passed with the skb
 196          * and the source address from the transport.
 197          */
 198         ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
 199         ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
 200
 201         fl.fl6_flowlabel = np->flow_label;
 202         IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
 203         if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
 204                 fl.oif = transport->saddr.v6.sin6_scope_id;
 205         else
 206                 fl.oif = sk->sk_bound_dev_if;
 207
 208         if (np->opt && np->opt->srcrt) {
 209                 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 210                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 211         }
 212
 213         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
 214                           "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
 215                           __FUNCTION__, skb, skb->len,
 216                           NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
 217
 218         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 219
 220         return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
 221 }
 222
 223 /* Returns the dst cache entry for the given source and destination ip
 224  * addresses.
 225  */
 226 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
 227                                          union sctp_addr *daddr,
 228                                          union sctp_addr *saddr)
 229 {
 230         struct dst_entry *dst;
 231         struct flowi fl;
 232
 233         memset(&fl, 0, sizeof(fl));
 234         ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
 235         if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
 236                 fl.oif = daddr->v6.sin6_scope_id;
 237
 238
 239         SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
 240                           __FUNCTION__, NIP6(fl.fl6_dst));
 241
 242         if (saddr) {
 243                 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
 244                 SCTP_DEBUG_PRINTK(
 245                         "SRC=" NIP6_FMT " - ",
 246                         NIP6(fl.fl6_src));
 247         }
 248
 249         dst = ip6_route_output(NULL, &fl);
 250         if (!dst->error) {
 251                 struct rt6_info *rt;
 252                 rt = (struct rt6_info *)dst;
 253                 SCTP_DEBUG_PRINTK(
 254                         "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
 255                         NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
 256                 return dst;
 257         }
 258         SCTP_DEBUG_PRINTK("NO ROUTE\n");
 259         dst_release(dst);
 260         return NULL;
 261 }
 262
 263 /* Returns the number of consecutive initial bits that match in the 2 ipv6
 264  * addresses.
 265  */
 266 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
 267                                          union sctp_addr *s2)
 268 {
 269         struct in6_addr *a1 = &s1->v6.sin6_addr;
 270         struct in6_addr *a2 = &s2->v6.sin6_addr;
 271         int i, j;
 272
 273         for (i = 0; i < 4 ; i++) {
 274                 __be32 a1xora2;
 275
 276                 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
 277
 278                 if ((j = fls(ntohl(a1xora2))))
 279                         return (i * 32 + 32 - j);
 280         }
 281
 282         return (i*32);
 283 }
 284
 285 /* Fills in the source address(saddr) based on the destination address(daddr)
 286  * and asoc's bind address list.
 287  */
 288 static void sctp_v6_get_saddr(struct sctp_association *asoc,
 289                               struct dst_entry *dst,
 290                               union sctp_addr *daddr,
 291                               union sctp_addr *saddr)
 292 {
 293         struct sctp_bind_addr *bp;
 294         rwlock_t *addr_lock;
 295         struct sctp_sockaddr_entry *laddr;
 296         struct list_head *pos;
 297         sctp_scope_t scope;
 298         union sctp_addr *baddr = NULL;
 299         __u8 matchlen = 0;
 300         __u8 bmatchlen;
 301
 302         SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
 303                           "daddr:" NIP6_FMT " ",
 304                           __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
 305
 306         if (!asoc) {
 307                 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
 308                 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
 309                                   NIP6(saddr->v6.sin6_addr));
 310                 return;
 311         }
 312
 313         scope = sctp_scope(daddr);
 314
 315         bp = &asoc->base.bind_addr;
 316         addr_lock = &asoc->base.addr_lock;
 317
 318         /* Go through the bind address list and find the best source address
 319          * that matches the scope of the destination address.
 320          */
 321         sctp_read_lock(addr_lock);
 322         list_for_each(pos, &bp->address_list) {
 323                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
 324                 if ((laddr->use_as_src) &&
 325                     (laddr->a.sa.sa_family == AF_INET6) &&
 326                     (scope <= sctp_scope(&laddr->a))) {
 327                         bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
 328                         if (!baddr || (matchlen < bmatchlen)) {
 329                                 baddr = &laddr->a;
 330                                 matchlen = bmatchlen;
 331                         }
 332                 }
 333         }
 334
 335         if (baddr) {
 336                 memcpy(saddr, baddr, sizeof(union sctp_addr));
 337                 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
 338                                   NIP6(saddr->v6.sin6_addr));
 339         } else {
 340                 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
 341                        "address for the dest:" NIP6_FMT "\n",
 342                        __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
 343         }
 344
 345         sctp_read_unlock(addr_lock);
 346 }
 347
 348 /* Make a copy of all potential local addresses. */
 349 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
 350                                   struct net_device *dev)
 351 {
 352         struct inet6_dev *in6_dev;
 353         struct inet6_ifaddr *ifp;
 354         struct sctp_sockaddr_entry *addr;
 355
 356         rcu_read_lock();
 357         if ((in6_dev = __in6_dev_get(dev)) == NULL) {
 358                 rcu_read_unlock();
 359                 return;
 360         }
 361
 362         read_lock_bh(&in6_dev->lock);
 363         for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
 364                 /* Add the address to the local list.  */
 365                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
 366                 if (addr) {
 367                         addr->a.v6.sin6_family = AF_INET6;
 368                         addr->a.v6.sin6_port = 0;
 369                         addr->a.v6.sin6_addr = ifp->addr;
 370                         addr->a.v6.sin6_scope_id = dev->ifindex;
 371                         INIT_LIST_HEAD(&addr->list);
 372                         list_add_tail(&addr->list, addrlist);
 373                 }
 374         }
 375
 376         read_unlock_bh(&in6_dev->lock);
 377         rcu_read_unlock();
 378 }
 379
 380 /* Initialize a sockaddr_storage from in incoming skb. */
 381 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
 382                              int is_saddr)
 383 {
 384         void *from;
 385         __be16 *port;
 386         struct sctphdr *sh;
 387
 388         port = &addr->v6.sin6_port;
 389         addr->v6.sin6_family = AF_INET6;
 390         addr->v6.sin6_flowinfo = 0; /* FIXME */
 391         addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
 392
 393         sh = (struct sctphdr *) skb->h.raw;
 394         if (is_saddr) {
 395                 *port  = sh->source;
 396                 from = &skb->nh.ipv6h->saddr;
 397         } else {
 398                 *port = sh->dest;
 399                 from = &skb->nh.ipv6h->daddr;
 400         }
 401         ipv6_addr_copy(&addr->v6.sin6_addr, from);
 402 }
 403
 404 /* Initialize an sctp_addr from a socket. */
 405 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
 406 {
 407         addr->v6.sin6_family = AF_INET6;
 408         addr->v6.sin6_port = 0;
 409         addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
 410 }
 411
 412 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
 413 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 414 {
 415         if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
 416                 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
 417                 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
 418                 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
 419                 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
 420                         addr->v4.sin_addr.s_addr;
 421         } else {
 422                 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
 423         }
 424 }
 425
 426 /* Initialize sk->sk_daddr from sctp_addr. */
 427 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 428 {
 429         if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
 430                 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
 431                 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
 432                 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
 433                 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
 434         } else {
 435                 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
 436         }
 437 }
 438
 439 /* Initialize a sctp_addr from an address parameter. */
 440 static void sctp_v6_from_addr_param(union sctp_addr *addr,
 441                                     union sctp_addr_param *param,
 442                                     __be16 port, int iif)
 443 {
 444         addr->v6.sin6_family = AF_INET6;
 445         addr->v6.sin6_port = port;
 446         addr->v6.sin6_flowinfo = 0; /* BUG */
 447         ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
 448         addr->v6.sin6_scope_id = iif;
 449 }
 450
 451 /* Initialize an address parameter from a sctp_addr and return the length
 452  * of the address parameter.
 453  */
 454 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
 455                                  union sctp_addr_param *param)
 456 {
 457         int length = sizeof(sctp_ipv6addr_param_t);
 458
 459         param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
 460         param->v6.param_hdr.length = htons(length);
 461         ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
 462
 463         return length;
 464 }
 465
 466 /* Initialize a sctp_addr from a dst_entry. */
 467 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
 468                               __be16 port)
 469 {
 470         struct rt6_info *rt = (struct rt6_info *)dst;
 471         addr->sa.sa_family = AF_INET6;
 472         addr->v6.sin6_port = port;
 473         ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
 474 }
 475
 476 /* Compare addresses exactly.
 477  * v4-mapped-v6 is also in consideration.
 478  */
 479 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
 480                             const union sctp_addr *addr2)
 481 {
 482         if (addr1->sa.sa_family != addr2->sa.sa_family) {
 483                 if (addr1->sa.sa_family == AF_INET &&
 484                     addr2->sa.sa_family == AF_INET6 &&
 485                     IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
 486                         if (addr2->v6.sin6_port == addr1->v4.sin_port &&
 487                             addr2->v6.sin6_addr.s6_addr32[3] ==
 488                             addr1->v4.sin_addr.s_addr)
 489                                 return 1;
 490                 }
 491                 if (addr2->sa.sa_family == AF_INET &&
 492                     addr1->sa.sa_family == AF_INET6 &&
 493                     IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
 494                         if (addr1->v6.sin6_port == addr2->v4.sin_port &&
 495                             addr1->v6.sin6_addr.s6_addr32[3] ==
 496                             addr2->v4.sin_addr.s_addr)
 497                                 return 1;
 498                 }
 499                 return 0;
 500         }
 501         if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
 502                 return 0;
 503         /* If this is a linklocal address, compare the scope_id. */
 504         if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
 505                 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
 506                     (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
 507                         return 0;
 508                 }
 509         }
 510
 511         return 1;
 512 }
 513
 514 /* Initialize addr struct to INADDR_ANY. */
 515 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
 516 {
 517         memset(addr, 0x00, sizeof(union sctp_addr));
 518         addr->v6.sin6_family = AF_INET6;
 519         addr->v6.sin6_port = port;
 520 }
 521
 522 /* Is this a wildcard address? */
 523 static int sctp_v6_is_any(const union sctp_addr *addr)
 524 {
 525         return ipv6_addr_any(&addr->v6.sin6_addr);
 526 }
 527
 528 /* Should this be available for binding?   */
 529 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
 530 {
 531         int type;
 532         struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
 533
 534         type = ipv6_addr_type(in6);
 535         if (IPV6_ADDR_ANY == type)
 536                 return 1;
 537         if (type == IPV6_ADDR_MAPPED) {
 538                 if (sp && !sp->v4mapped)
 539                         return 0;
 540                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
 541                         return 0;
 542                 sctp_v6_map_v4(addr);
 543                 return sctp_get_af_specific(AF_INET)->available(addr, sp);
 544         }
 545         if (!(type & IPV6_ADDR_UNICAST))
 546                 return 0;
 547
 548         return ipv6_chk_addr(in6, NULL, 0);
 549 }
 550
 551 /* This function checks if the address is a valid address to be used for
 552  * SCTP.
 553  *
 554  * Output:
 555  * Return 0 - If the address is a non-unicast or an illegal address.
 556  * Return 1 - If the address is a unicast.
 557  */
 558 static int sctp_v6_addr_valid(union sctp_addr *addr,
 559                               struct sctp_sock *sp,
 560                               const struct sk_buff *skb)
 561 {
 562         int ret = ipv6_addr_type(&addr->v6.sin6_addr);
 563
 564         /* Support v4-mapped-v6 address. */
 565         if (ret == IPV6_ADDR_MAPPED) {
 566                 /* Note: This routine is used in input, so v4-mapped-v6
 567                  * are disallowed here when there is no sctp_sock.
 568                  */
 569                 if (!sp || !sp->v4mapped)
 570                         return 0;
 571                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
 572                         return 0;
 573                 sctp_v6_map_v4(addr);
 574                 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
 575         }
 576
 577         /* Is this a non-unicast address */
 578         if (!(ret & IPV6_ADDR_UNICAST))
 579                 return 0;
 580
 581         return 1;
 582 }
 583
 584 /* What is the scope of 'addr'?  */
 585 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
 586 {
 587         int v6scope;
 588         sctp_scope_t retval;
 589
 590         /* The IPv6 scope is really a set of bit fields.
 591          * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
 592          */
 593
 594         v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
 595         switch (v6scope) {
 596         case IFA_HOST:
 597                 retval = SCTP_SCOPE_LOOPBACK;
 598                 break;
 599         case IFA_LINK:
 600                 retval = SCTP_SCOPE_LINK;
 601                 break;
 602         case IFA_SITE:
 603                 retval = SCTP_SCOPE_PRIVATE;
 604                 break;
 605         default:
 606                 retval = SCTP_SCOPE_GLOBAL;
 607                 break;
 608         };
 609
 610         return retval;
 611 }
 612
 613 /* Create and initialize a new sk for the socket to be returned by accept(). */
 614 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
 615                                              struct sctp_association *asoc)
 616 {
 617         struct inet_sock *inet = inet_sk(sk);
 618         struct sock *newsk;
 619         struct inet_sock *newinet;
 620         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 621         struct sctp6_sock *newsctp6sk;
 622
 623         newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
 624         if (!newsk)
 625                 goto out;
 626
 627         sock_init_data(NULL, newsk);
 628
 629         newsk->sk_type = SOCK_STREAM;
 630
 631         newsk->sk_prot = sk->sk_prot;
 632         newsk->sk_no_check = sk->sk_no_check;
 633         newsk->sk_reuse = sk->sk_reuse;
 634
 635         newsk->sk_destruct = inet_sock_destruct;
 636         newsk->sk_family = PF_INET6;
 637         newsk->sk_protocol = IPPROTO_SCTP;
 638         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 639         newsk->sk_shutdown = sk->sk_shutdown;
 640         sock_reset_flag(sk, SOCK_ZAPPED);
 641
 642         newsctp6sk = (struct sctp6_sock *)newsk;
 643         inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
 644
 645         newinet = inet_sk(newsk);
 646         newnp = inet6_sk(newsk);
 647
 648         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 649
 650         /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
 651          * and getpeername().
 652          */
 653         newinet->sport = inet->sport;
 654         newnp->saddr = np->saddr;
 655         newnp->rcv_saddr = np->rcv_saddr;
 656         newinet->dport = htons(asoc->peer.port);
 657         sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
 658
 659         /* Init the ipv4 part of the socket since we can have sockets
 660          * using v6 API for ipv4.
 661          */
 662         newinet->uc_ttl = -1;
 663         newinet->mc_loop = 1;
 664         newinet->mc_ttl = 1;
 665         newinet->mc_index = 0;
 666         newinet->mc_list = NULL;
 667
 668         if (ipv4_config.no_pmtu_disc)
 669                 newinet->pmtudisc = IP_PMTUDISC_DONT;
 670         else
 671                 newinet->pmtudisc = IP_PMTUDISC_WANT;
 672
 673         sk_refcnt_debug_inc(newsk);
 674
 675         if (newsk->sk_prot->init(newsk)) {
 676                 sk_common_release(newsk);
 677                 newsk = NULL;
 678         }
 679
 680 out:
 681         return newsk;
 682 }
 683
 684 /* Map v4 address to mapped v6 address */
 685 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 686 {
 687         if (sp->v4mapped && AF_INET == addr->sa.sa_family)
 688                 sctp_v4_map_v6(addr);
 689 }
 690
 691 /* Where did this skb come from?  */
 692 static int sctp_v6_skb_iif(const struct sk_buff *skb)
 693 {
 694         struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
 695         return opt->iif;
 696 }
 697
 698 /* Was this packet marked by Explicit Congestion Notification? */
 699 static int sctp_v6_is_ce(const struct sk_buff *skb)
 700 {
 701         return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
 702 }
 703
 704 /* Dump the v6 addr to the seq file. */
 705 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 706 {
 707         seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
 708 }
 709
 710 /* Initialize a PF_INET6 socket msg_name. */
 711 static void sctp_inet6_msgname(char *msgname, int *addr_len)
 712 {
 713         struct sockaddr_in6 *sin6;
 714
 715         sin6 = (struct sockaddr_in6 *)msgname;
 716         sin6->sin6_family = AF_INET6;
 717         sin6->sin6_flowinfo = 0;
 718         sin6->sin6_scope_id = 0; /*FIXME */
 719         *addr_len = sizeof(struct sockaddr_in6);
 720 }
 721
 722 /* Initialize a PF_INET msgname from a ulpevent. */
 723 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
 724                                      char *msgname, int *addrlen)
 725 {
 726         struct sockaddr_in6 *sin6, *sin6from;
 727
 728         if (msgname) {
 729                 union sctp_addr *addr;
 730                 struct sctp_association *asoc;
 731
 732                 asoc = event->asoc;
 733                 sctp_inet6_msgname(msgname, addrlen);
 734                 sin6 = (struct sockaddr_in6 *)msgname;
 735                 sin6->sin6_port = htons(asoc->peer.port);
 736                 addr = &asoc->peer.primary_addr;
 737
 738                 /* Note: If we go to a common v6 format, this code
 739                  * will change.
 740                  */
 741
 742                 /* Map ipv4 address into v4-mapped-on-v6 address.  */
 743                 if (sctp_sk(asoc->base.sk)->v4mapped &&
 744                     AF_INET == addr->sa.sa_family) {
 745                         sctp_v4_map_v6((union sctp_addr *)sin6);
 746                         sin6->sin6_addr.s6_addr32[3] =
 747                                 addr->v4.sin_addr.s_addr;
 748                         return;
 749                 }
 750
 751                 sin6from = &asoc->peer.primary_addr.v6;
 752                 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
 753                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 754                         sin6->sin6_scope_id = sin6from->sin6_scope_id;
 755         }
 756 }
 757
 758 /* Initialize a msg_name from an inbound skb. */
 759 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
 760                                    int *addr_len)
 761 {
 762         struct sctphdr *sh;
 763         struct sockaddr_in6 *sin6;
 764
 765         if (msgname) {
 766                 sctp_inet6_msgname(msgname, addr_len);
 767                 sin6 = (struct sockaddr_in6 *)msgname;
 768                 sh = (struct sctphdr *)skb->h.raw;
 769                 sin6->sin6_port = sh->source;
 770
 771                 /* Map ipv4 address into v4-mapped-on-v6 address. */
 772                 if (sctp_sk(skb->sk)->v4mapped &&
 773                     ip_hdr(skb)->version == 4) {
 774                         sctp_v4_map_v6((union sctp_addr *)sin6);
 775                         sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
 776                         return;
 777                 }
 778
 779                 /* Otherwise, just copy the v6 address. */
 780                 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
 781                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
 782                         struct sctp_ulpevent *ev = sctp_skb2event(skb);
 783                         sin6->sin6_scope_id = ev->iif;
 784                 }
 785         }
 786 }
 787
 788 /* Do we support this AF? */
 789 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
 790 {
 791         switch (family) {
 792         case AF_INET6:
 793                 return 1;
 794         /* v4-mapped-v6 addresses */
 795         case AF_INET:
 796                 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
 797                         return 1;
 798         default:
 799                 return 0;
 800         }
 801 }
 802
 803 /* Address matching with wildcards allowed.  This extra level
 804  * of indirection lets us choose whether a PF_INET6 should
 805  * disallow any v4 addresses if we so choose.
 806  */
 807 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
 808                                const union sctp_addr *addr2,
 809                                struct sctp_sock *opt)
 810 {
 811         struct sctp_af *af1, *af2;
 812
 813         af1 = sctp_get_af_specific(addr1->sa.sa_family);
 814         af2 = sctp_get_af_specific(addr2->sa.sa_family);
 815
 816         if (!af1 || !af2)
 817                 return 0;
 818         /* Today, wildcard AF_INET/AF_INET6. */
 819         if (sctp_is_any(addr1) || sctp_is_any(addr2))
 820                 return 1;
 821
 822         if (addr1->sa.sa_family != addr2->sa.sa_family)
 823                 return 0;
 824
 825         return af1->cmp_addr(addr1, addr2);
 826 }
 827
 828 /* Verify that the provided sockaddr looks bindable.   Common verification,
 829  * has already been taken care of.
 830  */
 831 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 832 {
 833         struct sctp_af *af;
 834
 835         /* ASSERT: address family has already been verified. */
 836         if (addr->sa.sa_family != AF_INET6)
 837                 af = sctp_get_af_specific(addr->sa.sa_family);
 838         else {
 839                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
 840                 struct net_device *dev;
 841
 842                 if (type & IPV6_ADDR_LINKLOCAL) {
 843                         if (!addr->v6.sin6_scope_id)
 844                                 return 0;
 845                         dev = dev_get_by_index(addr->v6.sin6_scope_id);
 846                         if (!dev)
 847                                 return 0;
 848                         dev_put(dev);
 849                 }
 850                 af = opt->pf->af;
 851         }
 852         return af->available(addr, opt);
 853 }
 854
 855 /* Verify that the provided sockaddr looks sendable.   Common verification,
 856  * has already been taken care of.
 857  */
 858 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 859 {
 860         struct sctp_af *af = NULL;
 861
 862         /* ASSERT: address family has already been verified. */
 863         if (addr->sa.sa_family != AF_INET6)
 864                 af = sctp_get_af_specific(addr->sa.sa_family);
 865         else {
 866                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
 867                 struct net_device *dev;
 868
 869                 if (type & IPV6_ADDR_LINKLOCAL) {
 870                         if (!addr->v6.sin6_scope_id)
 871                                 return 0;
 872                         dev = dev_get_by_index(addr->v6.sin6_scope_id);
 873                         if (!dev)
 874                                 return 0;
 875                         dev_put(dev);
 876                 }
 877                 af = opt->pf->af;
 878         }
 879
 880         return af != NULL;
 881 }
 882
 883 /* Fill in Supported Address Type information for INIT and INIT-ACK
 884  * chunks.   Note: In the future, we may want to look at sock options
 885  * to determine whether a PF_INET6 socket really wants to have IPV4
 886  * addresses.
 887  * Returns number of addresses supported.
 888  */
 889 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
 890                                       __be16 *types)
 891 {
 892         types[0] = SCTP_PARAM_IPV4_ADDRESS;
 893         types[1] = SCTP_PARAM_IPV6_ADDRESS;
 894         return 2;
 895 }
 896
 897 static const struct proto_ops inet6_seqpacket_ops = {
 898         .family            = PF_INET6,
 899         .owner             = THIS_MODULE,
 900         .release           = inet6_release,
 901         .bind              = inet6_bind,
 902         .connect           = inet_dgram_connect,
 903         .socketpair        = sock_no_socketpair,
 904         .accept            = inet_accept,
 905         .getname           = inet6_getname,
 906         .poll              = sctp_poll,
 907         .ioctl             = inet6_ioctl,
 908         .listen            = sctp_inet_listen,
 909         .shutdown          = inet_shutdown,
 910         .setsockopt        = sock_common_setsockopt,
 911         .getsockopt        = sock_common_getsockopt,
 912         .sendmsg           = inet_sendmsg,
 913         .recvmsg           = sock_common_recvmsg,
 914         .mmap              = sock_no_mmap,
 915 #ifdef CONFIG_COMPAT
 916         .compat_setsockopt = compat_sock_common_setsockopt,
 917         .compat_getsockopt = compat_sock_common_getsockopt,
 918 #endif
 919 };
 920
 921 static struct inet_protosw sctpv6_seqpacket_protosw = {
 922         .type          = SOCK_SEQPACKET,
 923         .protocol      = IPPROTO_SCTP,
 924         .prot          = &sctpv6_prot,
 925         .ops           = &inet6_seqpacket_ops,
 926         .capability    = -1,
 927         .no_check      = 0,
 928         .flags         = SCTP_PROTOSW_FLAG
 929 };
 930 static struct inet_protosw sctpv6_stream_protosw = {
 931         .type          = SOCK_STREAM,
 932         .protocol      = IPPROTO_SCTP,
 933         .prot          = &sctpv6_prot,
 934         .ops           = &inet6_seqpacket_ops,
 935         .capability    = -1,
 936         .no_check      = 0,
 937         .flags         = SCTP_PROTOSW_FLAG,
 938 };
 939
 940 static int sctp6_rcv(struct sk_buff **pskb)
 941 {
 942         return sctp_rcv(*pskb) ? -1 : 0;
 943 }
 944
 945 static struct inet6_protocol sctpv6_protocol = {
 946         .handler      = sctp6_rcv,
 947         .err_handler  = sctp_v6_err,
 948         .flags        = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
 949 };
 950
 951 static struct sctp_af sctp_ipv6_specific = {
 952         .sa_family         = AF_INET6,
 953         .sctp_xmit         = sctp_v6_xmit,
 954         .setsockopt        = ipv6_setsockopt,
 955         .getsockopt        = ipv6_getsockopt,
 956         .get_dst           = sctp_v6_get_dst,
 957         .get_saddr         = sctp_v6_get_saddr,
 958         .copy_addrlist     = sctp_v6_copy_addrlist,
 959         .from_skb          = sctp_v6_from_skb,
 960         .from_sk           = sctp_v6_from_sk,
 961         .to_sk_saddr       = sctp_v6_to_sk_saddr,
 962         .to_sk_daddr       = sctp_v6_to_sk_daddr,
 963         .from_addr_param   = sctp_v6_from_addr_param,
 964         .to_addr_param     = sctp_v6_to_addr_param,
 965         .dst_saddr         = sctp_v6_dst_saddr,
 966         .cmp_addr          = sctp_v6_cmp_addr,
 967         .scope             = sctp_v6_scope,
 968         .addr_valid        = sctp_v6_addr_valid,
 969         .inaddr_any        = sctp_v6_inaddr_any,
 970         .is_any            = sctp_v6_is_any,
 971         .available         = sctp_v6_available,
 972         .skb_iif           = sctp_v6_skb_iif,
 973         .is_ce             = sctp_v6_is_ce,
 974         .seq_dump_addr     = sctp_v6_seq_dump_addr,
 975         .net_header_len    = sizeof(struct ipv6hdr),
 976         .sockaddr_len      = sizeof(struct sockaddr_in6),
 977 #ifdef CONFIG_COMPAT
 978         .compat_setsockopt = compat_ipv6_setsockopt,
 979         .compat_getsockopt = compat_ipv6_getsockopt,
 980 #endif
 981 };
 982
 983 static struct sctp_pf sctp_pf_inet6_specific = {
 984         .event_msgname = sctp_inet6_event_msgname,
 985         .skb_msgname   = sctp_inet6_skb_msgname,
 986         .af_supported  = sctp_inet6_af_supported,
 987         .cmp_addr      = sctp_inet6_cmp_addr,
 988         .bind_verify   = sctp_inet6_bind_verify,
 989         .send_verify   = sctp_inet6_send_verify,
 990         .supported_addrs = sctp_inet6_supported_addrs,
 991         .create_accept_sk = sctp_v6_create_accept_sk,
 992         .addr_v4map    = sctp_v6_addr_v4map,
 993         .af            = &sctp_ipv6_specific,
 994 };
 995
 996 /* Initialize IPv6 support and register with inet6 stack.  */
 997 int sctp_v6_init(void)
 998 {
 999         int rc = proto_register(&sctpv6_prot, 1);
1000
1001         if (rc)
1002                 goto out;
1003         /* Register inet6 protocol. */
1004         rc = -EAGAIN;
1005         if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1006                 goto out_unregister_sctp_proto;
1007
1008         /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1009         inet6_register_protosw(&sctpv6_seqpacket_protosw);
1010         inet6_register_protosw(&sctpv6_stream_protosw);
1011
1012         /* Register the SCTP specific PF_INET6 functions. */
1013         sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
1014
1015         /* Register the SCTP specific AF_INET6 functions. */
1016         sctp_register_af(&sctp_ipv6_specific);
1017
1018         /* Register notifier for inet6 address additions/deletions. */
1019         register_inet6addr_notifier(&sctp_inet6addr_notifier);
1020         rc = 0;
1021 out:
1022         return rc;
1023 out_unregister_sctp_proto:
1024         proto_unregister(&sctpv6_prot);
1025         goto out;
1026 }
1027
1028 /* IPv6 specific exit support. */
1029 void sctp_v6_exit(void)
1030 {
1031         list_del(&sctp_ipv6_specific.list);
1032         inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1033         inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1034         inet6_unregister_protosw(&sctpv6_stream_protosw);
1035         unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1036         proto_unregister(&sctpv6_prot);
1037 }