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   1 /* SCTP kernel 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 implementation
   8  *
   9  * SCTP over IPv6.
  10  *
  11  * This SCTP 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  * This SCTP 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 #include <linux/slab.h>
  62
  63 #include <linux/ipv6.h>
  64 #include <linux/icmpv6.h>
  65 #include <linux/random.h>
  66 #include <linux/seq_file.h>
  67
  68 #include <net/protocol.h>
  69 #include <net/ndisc.h>
  70 #include <net/ip.h>
  71 #include <net/ipv6.h>
  72 #include <net/transp_v6.h>
  73 #include <net/addrconf.h>
  74 #include <net/ip6_route.h>
  75 #include <net/inet_common.h>
  76 #include <net/inet_ecn.h>
  77 #include <net/sctp/sctp.h>
  78
  79 #include <asm/uaccess.h>
  80
  81 /* Event handler for inet6 address addition/deletion events.
  82  * The sctp_local_addr_list needs to be protocted by a spin lock since
  83  * multiple notifiers (say IPv4 and IPv6) may be running at the same
  84  * time and thus corrupt the list.
  85  * The reader side is protected with RCU.
  86  */
  87 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
  88                                 void *ptr)
  89 {
  90         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
  91         struct sctp_sockaddr_entry *addr = NULL;
  92         struct sctp_sockaddr_entry *temp;
  93         int found = 0;
  94
  95         switch (ev) {
  96         case NETDEV_UP:
  97                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
  98                 if (addr) {
  99                         addr->a.v6.sin6_family = AF_INET6;
 100                         addr->a.v6.sin6_port = 0;
 101                         ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->addr);
 102                         addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
 103                         addr->valid = 1;
 104                         spin_lock_bh(&sctp_local_addr_lock);
 105                         list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
 106                         spin_unlock_bh(&sctp_local_addr_lock);
 107                 }
 108                 break;
 109         case NETDEV_DOWN:
 110                 spin_lock_bh(&sctp_local_addr_lock);
 111                 list_for_each_entry_safe(addr, temp,
 112                                         &sctp_local_addr_list, list) {
 113                         if (addr->a.sa.sa_family == AF_INET6 &&
 114                                         ipv6_addr_equal(&addr->a.v6.sin6_addr,
 115                                                 &ifa->addr)) {
 116                                 found = 1;
 117                                 addr->valid = 0;
 118                                 list_del_rcu(&addr->list);
 119                                 break;
 120                         }
 121                 }
 122                 spin_unlock_bh(&sctp_local_addr_lock);
 123                 if (found)
 124                         call_rcu(&addr->rcu, sctp_local_addr_free);
 125                 break;
 126         }
 127
 128         return NOTIFY_DONE;
 129 }
 130
 131 static struct notifier_block sctp_inet6addr_notifier = {
 132         .notifier_call = sctp_inet6addr_event,
 133 };
 134
 135 /* ICMP error handler. */
 136 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 137                              u8 type, u8 code, int offset, __be32 info)
 138 {
 139         struct inet6_dev *idev;
 140         struct sock *sk;
 141         struct sctp_association *asoc;
 142         struct sctp_transport *transport;
 143         struct ipv6_pinfo *np;
 144         sk_buff_data_t saveip, savesctp;
 145         int err;
 146
 147         idev = in6_dev_get(skb->dev);
 148
 149         /* Fix up skb to look at the embedded net header. */
 150         saveip   = skb->network_header;
 151         savesctp = skb->transport_header;
 152         skb_reset_network_header(skb);
 153         skb_set_transport_header(skb, offset);
 154         sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
 155         /* Put back, the original pointers. */
 156         skb->network_header   = saveip;
 157         skb->transport_header = savesctp;
 158         if (!sk) {
 159                 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS);
 160                 goto out;
 161         }
 162
 163         /* Warning:  The sock lock is held.  Remember to call
 164          * sctp_err_finish!
 165          */
 166
 167         switch (type) {
 168         case ICMPV6_PKT_TOOBIG:
 169                 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
 170                 goto out_unlock;
 171         case ICMPV6_PARAMPROB:
 172                 if (ICMPV6_UNK_NEXTHDR == code) {
 173                         sctp_icmp_proto_unreachable(sk, asoc, transport);
 174                         goto out_unlock;
 175                 }
 176                 break;
 177         default:
 178                 break;
 179         }
 180
 181         np = inet6_sk(sk);
 182         icmpv6_err_convert(type, code, &err);
 183         if (!sock_owned_by_user(sk) && np->recverr) {
 184                 sk->sk_err = err;
 185                 sk->sk_error_report(sk);
 186         } else {  /* Only an error on timeout */
 187                 sk->sk_err_soft = err;
 188         }
 189
 190 out_unlock:
 191         sctp_err_finish(sk, asoc);
 192 out:
 193         if (likely(idev != NULL))
 194                 in6_dev_put(idev);
 195 }
 196
 197 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
 198 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
 199 {
 200         struct sock *sk = skb->sk;
 201         struct ipv6_pinfo *np = inet6_sk(sk);
 202         struct flowi fl;
 203
 204         memset(&fl, 0, sizeof(fl));
 205
 206         fl.proto = sk->sk_protocol;
 207
 208         /* Fill in the dest address from the route entry passed with the skb
 209          * and the source address from the transport.
 210          */
 211         ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
 212         ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
 213
 214         fl.fl6_flowlabel = np->flow_label;
 215         IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
 216         if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
 217                 fl.oif = transport->saddr.v6.sin6_scope_id;
 218         else
 219                 fl.oif = sk->sk_bound_dev_if;
 220
 221         if (np->opt && np->opt->srcrt) {
 222                 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
 223                 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
 224         }
 225
 226         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
 227                           __func__, skb, skb->len,
 228                           &fl.fl6_src, &fl.fl6_dst);
 229
 230         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 231
 232         if (!(transport->param_flags & SPP_PMTUD_ENABLE))
 233                 skb->local_df = 1;
 234
 235         return ip6_xmit(sk, skb, &fl, np->opt);
 236 }
 237
 238 /* Returns the dst cache entry for the given source and destination ip
 239  * addresses.
 240  */
 241 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
 242                                          union sctp_addr *daddr,
 243                                          union sctp_addr *saddr)
 244 {
 245         struct dst_entry *dst;
 246         struct flowi fl;
 247
 248         memset(&fl, 0, sizeof(fl));
 249         ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
 250         if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
 251                 fl.oif = daddr->v6.sin6_scope_id;
 252
 253
 254         SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl.fl6_dst);
 255
 256         if (saddr) {
 257                 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
 258                 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl.fl6_src);
 259         }
 260
 261         dst = ip6_route_output(&init_net, NULL, &fl);
 262         if (!dst->error) {
 263                 struct rt6_info *rt;
 264                 rt = (struct rt6_info *)dst;
 265                 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
 266                         &rt->rt6i_dst.addr, &rt->rt6i_src.addr);
 267                 return dst;
 268         }
 269         SCTP_DEBUG_PRINTK("NO ROUTE\n");
 270         dst_release(dst);
 271         return NULL;
 272 }
 273
 274 /* Returns the number of consecutive initial bits that match in the 2 ipv6
 275  * addresses.
 276  */
 277 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
 278                                          union sctp_addr *s2)
 279 {
 280         return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
 281 }
 282
 283 /* Fills in the source address(saddr) based on the destination address(daddr)
 284  * and asoc's bind address list.
 285  */
 286 static void sctp_v6_get_saddr(struct sctp_sock *sk,
 287                               struct sctp_association *asoc,
 288                               struct dst_entry *dst,
 289                               union sctp_addr *daddr,
 290                               union sctp_addr *saddr)
 291 {
 292         struct sctp_bind_addr *bp;
 293         struct sctp_sockaddr_entry *laddr;
 294         sctp_scope_t scope;
 295         union sctp_addr *baddr = NULL;
 296         __u8 matchlen = 0;
 297         __u8 bmatchlen;
 298
 299         SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p daddr:%pI6 ",
 300                           __func__, asoc, dst, &daddr->v6.sin6_addr);
 301
 302         if (!asoc) {
 303                 ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)),
 304                                    dst ? ip6_dst_idev(dst)->dev : NULL,
 305                                    &daddr->v6.sin6_addr,
 306                                    inet6_sk(&sk->inet.sk)->srcprefs,
 307                                    &saddr->v6.sin6_addr);
 308                 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: %pI6\n",
 309                                   &saddr->v6.sin6_addr);
 310                 return;
 311         }
 312
 313         scope = sctp_scope(daddr);
 314
 315         bp = &asoc->base.bind_addr;
 316
 317         /* Go through the bind address list and find the best source address
 318          * that matches the scope of the destination address.
 319          */
 320         rcu_read_lock();
 321         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 322                 if (!laddr->valid)
 323                         continue;
 324                 if ((laddr->state == SCTP_ADDR_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: %pI6\n", &saddr->v6.sin6_addr);
 338         } else {
 339                 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
 340                        "address for the dest:%pI6\n",
 341                        __func__, asoc, &daddr->v6.sin6_addr);
 342         }
 343
 344         rcu_read_unlock();
 345 }
 346
 347 /* Make a copy of all potential local addresses. */
 348 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
 349                                   struct net_device *dev)
 350 {
 351         struct inet6_dev *in6_dev;
 352         struct inet6_ifaddr *ifp;
 353         struct sctp_sockaddr_entry *addr;
 354
 355         rcu_read_lock();
 356         if ((in6_dev = __in6_dev_get(dev)) == NULL) {
 357                 rcu_read_unlock();
 358                 return;
 359         }
 360
 361         read_lock_bh(&in6_dev->lock);
 362         list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
 363                 /* Add the address to the local list.  */
 364                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
 365                 if (addr) {
 366                         addr->a.v6.sin6_family = AF_INET6;
 367                         addr->a.v6.sin6_port = 0;
 368                         ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifp->addr);
 369                         addr->a.v6.sin6_scope_id = dev->ifindex;
 370                         addr->valid = 1;
 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 = sctp_hdr(skb);
 394         if (is_saddr) {
 395                 *port  = sh->source;
 396                 from = &ipv6_hdr(skb)->saddr;
 397         } else {
 398                 *port = sh->dest;
 399                 from = &ipv6_hdr(skb)->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         ipv6_addr_copy(&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                 ipv6_addr_copy(&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                 ipv6_addr_copy(&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_v4mapped(&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_v4mapped(&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(&init_net, 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 sock *newsk;
 618         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 619         struct sctp6_sock *newsctp6sk;
 620
 621         newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
 622         if (!newsk)
 623                 goto out;
 624
 625         sock_init_data(NULL, newsk);
 626
 627         sctp_copy_sock(newsk, sk, asoc);
 628         sock_reset_flag(sk, SOCK_ZAPPED);
 629
 630         newsctp6sk = (struct sctp6_sock *)newsk;
 631         inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
 632
 633         sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
 634
 635         newnp = inet6_sk(newsk);
 636
 637         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
 638
 639         /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
 640          * and getpeername().
 641          */
 642         sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
 643
 644         sk_refcnt_debug_inc(newsk);
 645
 646         if (newsk->sk_prot->init(newsk)) {
 647                 sk_common_release(newsk);
 648                 newsk = NULL;
 649         }
 650
 651 out:
 652         return newsk;
 653 }
 654
 655 /* Map v4 address to mapped v6 address */
 656 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 657 {
 658         if (sp->v4mapped && AF_INET == addr->sa.sa_family)
 659                 sctp_v4_map_v6(addr);
 660 }
 661
 662 /* Where did this skb come from?  */
 663 static int sctp_v6_skb_iif(const struct sk_buff *skb)
 664 {
 665         struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
 666         return opt->iif;
 667 }
 668
 669 /* Was this packet marked by Explicit Congestion Notification? */
 670 static int sctp_v6_is_ce(const struct sk_buff *skb)
 671 {
 672         return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
 673 }
 674
 675 /* Dump the v6 addr to the seq file. */
 676 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 677 {
 678         seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
 679 }
 680
 681 static void sctp_v6_ecn_capable(struct sock *sk)
 682 {
 683         inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
 684 }
 685
 686 /* Initialize a PF_INET6 socket msg_name. */
 687 static void sctp_inet6_msgname(char *msgname, int *addr_len)
 688 {
 689         struct sockaddr_in6 *sin6;
 690
 691         sin6 = (struct sockaddr_in6 *)msgname;
 692         sin6->sin6_family = AF_INET6;
 693         sin6->sin6_flowinfo = 0;
 694         sin6->sin6_scope_id = 0; /*FIXME */
 695         *addr_len = sizeof(struct sockaddr_in6);
 696 }
 697
 698 /* Initialize a PF_INET msgname from a ulpevent. */
 699 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
 700                                      char *msgname, int *addrlen)
 701 {
 702         struct sockaddr_in6 *sin6, *sin6from;
 703
 704         if (msgname) {
 705                 union sctp_addr *addr;
 706                 struct sctp_association *asoc;
 707
 708                 asoc = event->asoc;
 709                 sctp_inet6_msgname(msgname, addrlen);
 710                 sin6 = (struct sockaddr_in6 *)msgname;
 711                 sin6->sin6_port = htons(asoc->peer.port);
 712                 addr = &asoc->peer.primary_addr;
 713
 714                 /* Note: If we go to a common v6 format, this code
 715                  * will change.
 716                  */
 717
 718                 /* Map ipv4 address into v4-mapped-on-v6 address.  */
 719                 if (sctp_sk(asoc->base.sk)->v4mapped &&
 720                     AF_INET == addr->sa.sa_family) {
 721                         sctp_v4_map_v6((union sctp_addr *)sin6);
 722                         sin6->sin6_addr.s6_addr32[3] =
 723                                 addr->v4.sin_addr.s_addr;
 724                         return;
 725                 }
 726
 727                 sin6from = &asoc->peer.primary_addr.v6;
 728                 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
 729                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 730                         sin6->sin6_scope_id = sin6from->sin6_scope_id;
 731         }
 732 }
 733
 734 /* Initialize a msg_name from an inbound skb. */
 735 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
 736                                    int *addr_len)
 737 {
 738         struct sctphdr *sh;
 739         struct sockaddr_in6 *sin6;
 740
 741         if (msgname) {
 742                 sctp_inet6_msgname(msgname, addr_len);
 743                 sin6 = (struct sockaddr_in6 *)msgname;
 744                 sh = sctp_hdr(skb);
 745                 sin6->sin6_port = sh->source;
 746
 747                 /* Map ipv4 address into v4-mapped-on-v6 address. */
 748                 if (sctp_sk(skb->sk)->v4mapped &&
 749                     ip_hdr(skb)->version == 4) {
 750                         sctp_v4_map_v6((union sctp_addr *)sin6);
 751                         sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
 752                         return;
 753                 }
 754
 755                 /* Otherwise, just copy the v6 address. */
 756                 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
 757                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
 758                         struct sctp_ulpevent *ev = sctp_skb2event(skb);
 759                         sin6->sin6_scope_id = ev->iif;
 760                 }
 761         }
 762 }
 763
 764 /* Do we support this AF? */
 765 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
 766 {
 767         switch (family) {
 768         case AF_INET6:
 769                 return 1;
 770         /* v4-mapped-v6 addresses */
 771         case AF_INET:
 772                 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
 773                         return 1;
 774         default:
 775                 return 0;
 776         }
 777 }
 778
 779 /* Address matching with wildcards allowed.  This extra level
 780  * of indirection lets us choose whether a PF_INET6 should
 781  * disallow any v4 addresses if we so choose.
 782  */
 783 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
 784                                const union sctp_addr *addr2,
 785                                struct sctp_sock *opt)
 786 {
 787         struct sctp_af *af1, *af2;
 788         struct sock *sk = sctp_opt2sk(opt);
 789
 790         af1 = sctp_get_af_specific(addr1->sa.sa_family);
 791         af2 = sctp_get_af_specific(addr2->sa.sa_family);
 792
 793         if (!af1 || !af2)
 794                 return 0;
 795
 796         /* If the socket is IPv6 only, v4 addrs will not match */
 797         if (__ipv6_only_sock(sk) && af1 != af2)
 798                 return 0;
 799
 800         /* Today, wildcard AF_INET/AF_INET6. */
 801         if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
 802                 return 1;
 803
 804         if (addr1->sa.sa_family != addr2->sa.sa_family)
 805                 return 0;
 806
 807         return af1->cmp_addr(addr1, addr2);
 808 }
 809
 810 /* Verify that the provided sockaddr looks bindable.   Common verification,
 811  * has already been taken care of.
 812  */
 813 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 814 {
 815         struct sctp_af *af;
 816
 817         /* ASSERT: address family has already been verified. */
 818         if (addr->sa.sa_family != AF_INET6)
 819                 af = sctp_get_af_specific(addr->sa.sa_family);
 820         else {
 821                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
 822                 struct net_device *dev;
 823
 824                 if (type & IPV6_ADDR_LINKLOCAL) {
 825                         if (!addr->v6.sin6_scope_id)
 826                                 return 0;
 827                         rcu_read_lock();
 828                         dev = dev_get_by_index_rcu(&init_net,
 829                                                    addr->v6.sin6_scope_id);
 830                         if (!dev ||
 831                             !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
 832                                            dev, 0)) {
 833                                 rcu_read_unlock();
 834                                 return 0;
 835                         }
 836                         rcu_read_unlock();
 837                 } else if (type == IPV6_ADDR_MAPPED) {
 838                         if (!opt->v4mapped)
 839                                 return 0;
 840                 }
 841
 842                 af = opt->pf->af;
 843         }
 844         return af->available(addr, opt);
 845 }
 846
 847 /* Verify that the provided sockaddr looks sendable.   Common verification,
 848  * has already been taken care of.
 849  */
 850 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 851 {
 852         struct sctp_af *af = NULL;
 853
 854         /* ASSERT: address family has already been verified. */
 855         if (addr->sa.sa_family != AF_INET6)
 856                 af = sctp_get_af_specific(addr->sa.sa_family);
 857         else {
 858                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
 859                 struct net_device *dev;
 860
 861                 if (type & IPV6_ADDR_LINKLOCAL) {
 862                         if (!addr->v6.sin6_scope_id)
 863                                 return 0;
 864                         rcu_read_lock();
 865                         dev = dev_get_by_index_rcu(&init_net,
 866                                                    addr->v6.sin6_scope_id);
 867                         rcu_read_unlock();
 868                         if (!dev)
 869                                 return 0;
 870                 }
 871                 af = opt->pf->af;
 872         }
 873
 874         return af != NULL;
 875 }
 876
 877 /* Fill in Supported Address Type information for INIT and INIT-ACK
 878  * chunks.   Note: In the future, we may want to look at sock options
 879  * to determine whether a PF_INET6 socket really wants to have IPV4
 880  * addresses.
 881  * Returns number of addresses supported.
 882  */
 883 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
 884                                       __be16 *types)
 885 {
 886         types[0] = SCTP_PARAM_IPV6_ADDRESS;
 887         if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
 888                 types[1] = SCTP_PARAM_IPV4_ADDRESS;
 889                 return 2;
 890         }
 891         return 1;
 892 }
 893
 894 static const struct proto_ops inet6_seqpacket_ops = {
 895         .family            = PF_INET6,
 896         .owner             = THIS_MODULE,
 897         .release           = inet6_release,
 898         .bind              = inet6_bind,
 899         .connect           = inet_dgram_connect,
 900         .socketpair        = sock_no_socketpair,
 901         .accept            = inet_accept,
 902         .getname           = inet6_getname,
 903         .poll              = sctp_poll,
 904         .ioctl             = inet6_ioctl,
 905         .listen            = sctp_inet_listen,
 906         .shutdown          = inet_shutdown,
 907         .setsockopt        = sock_common_setsockopt,
 908         .getsockopt        = sock_common_getsockopt,
 909         .sendmsg           = inet_sendmsg,
 910         .recvmsg           = sock_common_recvmsg,
 911         .mmap              = sock_no_mmap,
 912 #ifdef CONFIG_COMPAT
 913         .compat_setsockopt = compat_sock_common_setsockopt,
 914         .compat_getsockopt = compat_sock_common_getsockopt,
 915 #endif
 916 };
 917
 918 static struct inet_protosw sctpv6_seqpacket_protosw = {
 919         .type          = SOCK_SEQPACKET,
 920         .protocol      = IPPROTO_SCTP,
 921         .prot          = &sctpv6_prot,
 922         .ops           = &inet6_seqpacket_ops,
 923         .no_check      = 0,
 924         .flags         = SCTP_PROTOSW_FLAG
 925 };
 926 static struct inet_protosw sctpv6_stream_protosw = {
 927         .type          = SOCK_STREAM,
 928         .protocol      = IPPROTO_SCTP,
 929         .prot          = &sctpv6_prot,
 930         .ops           = &inet6_seqpacket_ops,
 931         .no_check      = 0,
 932         .flags         = SCTP_PROTOSW_FLAG,
 933 };
 934
 935 static int sctp6_rcv(struct sk_buff *skb)
 936 {
 937         return sctp_rcv(skb) ? -1 : 0;
 938 }
 939
 940 static const struct inet6_protocol sctpv6_protocol = {
 941         .handler      = sctp6_rcv,
 942         .err_handler  = sctp_v6_err,
 943         .flags        = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
 944 };
 945
 946 static struct sctp_af sctp_af_inet6 = {
 947         .sa_family         = AF_INET6,
 948         .sctp_xmit         = sctp_v6_xmit,
 949         .setsockopt        = ipv6_setsockopt,
 950         .getsockopt        = ipv6_getsockopt,
 951         .get_dst           = sctp_v6_get_dst,
 952         .get_saddr         = sctp_v6_get_saddr,
 953         .copy_addrlist     = sctp_v6_copy_addrlist,
 954         .from_skb          = sctp_v6_from_skb,
 955         .from_sk           = sctp_v6_from_sk,
 956         .to_sk_saddr       = sctp_v6_to_sk_saddr,
 957         .to_sk_daddr       = sctp_v6_to_sk_daddr,
 958         .from_addr_param   = sctp_v6_from_addr_param,
 959         .to_addr_param     = sctp_v6_to_addr_param,
 960         .dst_saddr         = sctp_v6_dst_saddr,
 961         .cmp_addr          = sctp_v6_cmp_addr,
 962         .scope             = sctp_v6_scope,
 963         .addr_valid        = sctp_v6_addr_valid,
 964         .inaddr_any        = sctp_v6_inaddr_any,
 965         .is_any            = sctp_v6_is_any,
 966         .available         = sctp_v6_available,
 967         .skb_iif           = sctp_v6_skb_iif,
 968         .is_ce             = sctp_v6_is_ce,
 969         .seq_dump_addr     = sctp_v6_seq_dump_addr,
 970         .ecn_capable       = sctp_v6_ecn_capable,
 971         .net_header_len    = sizeof(struct ipv6hdr),
 972         .sockaddr_len      = sizeof(struct sockaddr_in6),
 973 #ifdef CONFIG_COMPAT
 974         .compat_setsockopt = compat_ipv6_setsockopt,
 975         .compat_getsockopt = compat_ipv6_getsockopt,
 976 #endif
 977 };
 978
 979 static struct sctp_pf sctp_pf_inet6 = {
 980         .event_msgname = sctp_inet6_event_msgname,
 981         .skb_msgname   = sctp_inet6_skb_msgname,
 982         .af_supported  = sctp_inet6_af_supported,
 983         .cmp_addr      = sctp_inet6_cmp_addr,
 984         .bind_verify   = sctp_inet6_bind_verify,
 985         .send_verify   = sctp_inet6_send_verify,
 986         .supported_addrs = sctp_inet6_supported_addrs,
 987         .create_accept_sk = sctp_v6_create_accept_sk,
 988         .addr_v4map    = sctp_v6_addr_v4map,
 989         .af            = &sctp_af_inet6,
 990 };
 991
 992 /* Initialize IPv6 support and register with socket layer.  */
 993 void sctp_v6_pf_init(void)
 994 {
 995         /* Register the SCTP specific PF_INET6 functions. */
 996         sctp_register_pf(&sctp_pf_inet6, PF_INET6);
 997
 998         /* Register the SCTP specific AF_INET6 functions. */
 999         sctp_register_af(&sctp_af_inet6);
1000 }
1001
1002 void sctp_v6_pf_exit(void)
1003 {
1004         list_del(&sctp_af_inet6.list);
1005 }
1006
1007 /* Initialize IPv6 support and register with socket layer.  */
1008 int sctp_v6_protosw_init(void)
1009 {
1010         int rc;
1011
1012         rc = proto_register(&sctpv6_prot, 1);
1013         if (rc)
1014                 return rc;
1015
1016         /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1017         inet6_register_protosw(&sctpv6_seqpacket_protosw);
1018         inet6_register_protosw(&sctpv6_stream_protosw);
1019
1020         return 0;
1021 }
1022
1023 void sctp_v6_protosw_exit(void)
1024 {
1025         inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1026         inet6_unregister_protosw(&sctpv6_stream_protosw);
1027         proto_unregister(&sctpv6_prot);
1028 }
1029
1030
1031 /* Register with inet6 layer. */
1032 int sctp_v6_add_protocol(void)
1033 {
1034         /* Register notifier for inet6 address additions/deletions. */
1035         register_inet6addr_notifier(&sctp_inet6addr_notifier);
1036
1037         if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1038                 return -EAGAIN;
1039
1040         return 0;
1041 }
1042
1043 /* Unregister with inet6 layer. */
1044 void sctp_v6_del_protocol(void)
1045 {
1046         inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1047         unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1048 }