linux/net/sctp/socket.c
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   1/* SCTP kernel implementation
   2 * (C) Copyright IBM Corp. 2001, 2004
   3 * Copyright (c) 1999-2000 Cisco, Inc.
   4 * Copyright (c) 1999-2001 Motorola, Inc.
   5 * Copyright (c) 2001-2003 Intel Corp.
   6 * Copyright (c) 2001-2002 Nokia, Inc.
   7 * Copyright (c) 2001 La Monte H.P. Yarroll
   8 *
   9 * This file is part of the SCTP kernel implementation
  10 *
  11 * These functions interface with the sockets layer to implement the
  12 * SCTP Extensions for the Sockets API.
  13 *
  14 * Note that the descriptions from the specification are USER level
  15 * functions--this file is the functions which populate the struct proto
  16 * for SCTP which is the BOTTOM of the sockets interface.
  17 *
  18 * This SCTP implementation is free software;
  19 * you can redistribute it and/or modify it under the terms of
  20 * the GNU General Public License as published by
  21 * the Free Software Foundation; either version 2, or (at your option)
  22 * any later version.
  23 *
  24 * This SCTP implementation is distributed in the hope that it
  25 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  26 *                 ************************
  27 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  28 * See the GNU General Public License for more details.
  29 *
  30 * You should have received a copy of the GNU General Public License
  31 * along with GNU CC; see the file COPYING.  If not, write to
  32 * the Free Software Foundation, 59 Temple Place - Suite 330,
  33 * Boston, MA 02111-1307, USA.
  34 *
  35 * Please send any bug reports or fixes you make to the
  36 * email address(es):
  37 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  38 *
  39 * Or submit a bug report through the following website:
  40 *    http://www.sf.net/projects/lksctp
  41 *
  42 * Written or modified by:
  43 *    La Monte H.P. Yarroll <piggy@acm.org>
  44 *    Narasimha Budihal     <narsi@refcode.org>
  45 *    Karl Knutson          <karl@athena.chicago.il.us>
  46 *    Jon Grimm             <jgrimm@us.ibm.com>
  47 *    Xingang Guo           <xingang.guo@intel.com>
  48 *    Daisy Chang           <daisyc@us.ibm.com>
  49 *    Sridhar Samudrala     <samudrala@us.ibm.com>
  50 *    Inaky Perez-Gonzalez  <inaky.gonzalez@intel.com>
  51 *    Ardelle Fan           <ardelle.fan@intel.com>
  52 *    Ryan Layer            <rmlayer@us.ibm.com>
  53 *    Anup Pemmaiah         <pemmaiah@cc.usu.edu>
  54 *    Kevin Gao             <kevin.gao@intel.com>
  55 *
  56 * Any bugs reported given to us we will try to fix... any fixes shared will
  57 * be incorporated into the next SCTP release.
  58 */
  59
  60#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  61
  62#include <linux/types.h>
  63#include <linux/kernel.h>
  64#include <linux/wait.h>
  65#include <linux/time.h>
  66#include <linux/ip.h>
  67#include <linux/capability.h>
  68#include <linux/fcntl.h>
  69#include <linux/poll.h>
  70#include <linux/init.h>
  71#include <linux/crypto.h>
  72#include <linux/slab.h>
  73#include <linux/file.h>
  74
  75#include <net/ip.h>
  76#include <net/icmp.h>
  77#include <net/route.h>
  78#include <net/ipv6.h>
  79#include <net/inet_common.h>
  80
  81#include <linux/socket.h> /* for sa_family_t */
  82#include <linux/export.h>
  83#include <net/sock.h>
  84#include <net/sctp/sctp.h>
  85#include <net/sctp/sm.h>
  86
  87/* WARNING:  Please do not remove the SCTP_STATIC attribute to
  88 * any of the functions below as they are used to export functions
  89 * used by a project regression testsuite.
  90 */
  91
  92/* Forward declarations for internal helper functions. */
  93static int sctp_writeable(struct sock *sk);
  94static void sctp_wfree(struct sk_buff *skb);
  95static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
  96                                size_t msg_len);
  97static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
  98static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
  99static int sctp_wait_for_accept(struct sock *sk, long timeo);
 100static void sctp_wait_for_close(struct sock *sk, long timeo);
 101static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
 102                                        union sctp_addr *addr, int len);
 103static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
 104static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
 105static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
 106static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
 107static int sctp_send_asconf(struct sctp_association *asoc,
 108                            struct sctp_chunk *chunk);
 109static int sctp_do_bind(struct sock *, union sctp_addr *, int);
 110static int sctp_autobind(struct sock *sk);
 111static void sctp_sock_migrate(struct sock *, struct sock *,
 112                              struct sctp_association *, sctp_socket_type_t);
 113static char *sctp_hmac_alg = SCTP_COOKIE_HMAC_ALG;
 114
 115extern struct kmem_cache *sctp_bucket_cachep;
 116extern long sysctl_sctp_mem[3];
 117extern int sysctl_sctp_rmem[3];
 118extern int sysctl_sctp_wmem[3];
 119
 120static int sctp_memory_pressure;
 121static atomic_long_t sctp_memory_allocated;
 122struct percpu_counter sctp_sockets_allocated;
 123
 124static void sctp_enter_memory_pressure(struct sock *sk)
 125{
 126        sctp_memory_pressure = 1;
 127}
 128
 129
 130/* Get the sndbuf space available at the time on the association.  */
 131static inline int sctp_wspace(struct sctp_association *asoc)
 132{
 133        int amt;
 134
 135        if (asoc->ep->sndbuf_policy)
 136                amt = asoc->sndbuf_used;
 137        else
 138                amt = sk_wmem_alloc_get(asoc->base.sk);
 139
 140        if (amt >= asoc->base.sk->sk_sndbuf) {
 141                if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
 142                        amt = 0;
 143                else {
 144                        amt = sk_stream_wspace(asoc->base.sk);
 145                        if (amt < 0)
 146                                amt = 0;
 147                }
 148        } else {
 149                amt = asoc->base.sk->sk_sndbuf - amt;
 150        }
 151        return amt;
 152}
 153
 154/* Increment the used sndbuf space count of the corresponding association by
 155 * the size of the outgoing data chunk.
 156 * Also, set the skb destructor for sndbuf accounting later.
 157 *
 158 * Since it is always 1-1 between chunk and skb, and also a new skb is always
 159 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
 160 * destructor in the data chunk skb for the purpose of the sndbuf space
 161 * tracking.
 162 */
 163static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
 164{
 165        struct sctp_association *asoc = chunk->asoc;
 166        struct sock *sk = asoc->base.sk;
 167
 168        /* The sndbuf space is tracked per association.  */
 169        sctp_association_hold(asoc);
 170
 171        skb_set_owner_w(chunk->skb, sk);
 172
 173        chunk->skb->destructor = sctp_wfree;
 174        /* Save the chunk pointer in skb for sctp_wfree to use later.  */
 175        *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
 176
 177        asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
 178                                sizeof(struct sk_buff) +
 179                                sizeof(struct sctp_chunk);
 180
 181        atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
 182        sk->sk_wmem_queued += chunk->skb->truesize;
 183        sk_mem_charge(sk, chunk->skb->truesize);
 184}
 185
 186/* Verify that this is a valid address. */
 187static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
 188                                   int len)
 189{
 190        struct sctp_af *af;
 191
 192        /* Verify basic sockaddr. */
 193        af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
 194        if (!af)
 195                return -EINVAL;
 196
 197        /* Is this a valid SCTP address?  */
 198        if (!af->addr_valid(addr, sctp_sk(sk), NULL))
 199                return -EINVAL;
 200
 201        if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
 202                return -EINVAL;
 203
 204        return 0;
 205}
 206
 207/* Look up the association by its id.  If this is not a UDP-style
 208 * socket, the ID field is always ignored.
 209 */
 210struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
 211{
 212        struct sctp_association *asoc = NULL;
 213
 214        /* If this is not a UDP-style socket, assoc id should be ignored. */
 215        if (!sctp_style(sk, UDP)) {
 216                /* Return NULL if the socket state is not ESTABLISHED. It
 217                 * could be a TCP-style listening socket or a socket which
 218                 * hasn't yet called connect() to establish an association.
 219                 */
 220                if (!sctp_sstate(sk, ESTABLISHED))
 221                        return NULL;
 222
 223                /* Get the first and the only association from the list. */
 224                if (!list_empty(&sctp_sk(sk)->ep->asocs))
 225                        asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
 226                                          struct sctp_association, asocs);
 227                return asoc;
 228        }
 229
 230        /* Otherwise this is a UDP-style socket. */
 231        if (!id || (id == (sctp_assoc_t)-1))
 232                return NULL;
 233
 234        spin_lock_bh(&sctp_assocs_id_lock);
 235        asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
 236        spin_unlock_bh(&sctp_assocs_id_lock);
 237
 238        if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
 239                return NULL;
 240
 241        return asoc;
 242}
 243
 244/* Look up the transport from an address and an assoc id. If both address and
 245 * id are specified, the associations matching the address and the id should be
 246 * the same.
 247 */
 248static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
 249                                              struct sockaddr_storage *addr,
 250                                              sctp_assoc_t id)
 251{
 252        struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
 253        struct sctp_transport *transport;
 254        union sctp_addr *laddr = (union sctp_addr *)addr;
 255
 256        addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
 257                                               laddr,
 258                                               &transport);
 259
 260        if (!addr_asoc)
 261                return NULL;
 262
 263        id_asoc = sctp_id2assoc(sk, id);
 264        if (id_asoc && (id_asoc != addr_asoc))
 265                return NULL;
 266
 267        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
 268                                                (union sctp_addr *)addr);
 269
 270        return transport;
 271}
 272
 273/* API 3.1.2 bind() - UDP Style Syntax
 274 * The syntax of bind() is,
 275 *
 276 *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
 277 *
 278 *   sd      - the socket descriptor returned by socket().
 279 *   addr    - the address structure (struct sockaddr_in or struct
 280 *             sockaddr_in6 [RFC 2553]),
 281 *   addr_len - the size of the address structure.
 282 */
 283SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
 284{
 285        int retval = 0;
 286
 287        sctp_lock_sock(sk);
 288
 289        SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
 290                          sk, addr, addr_len);
 291
 292        /* Disallow binding twice. */
 293        if (!sctp_sk(sk)->ep->base.bind_addr.port)
 294                retval = sctp_do_bind(sk, (union sctp_addr *)addr,
 295                                      addr_len);
 296        else
 297                retval = -EINVAL;
 298
 299        sctp_release_sock(sk);
 300
 301        return retval;
 302}
 303
 304static long sctp_get_port_local(struct sock *, union sctp_addr *);
 305
 306/* Verify this is a valid sockaddr. */
 307static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
 308                                        union sctp_addr *addr, int len)
 309{
 310        struct sctp_af *af;
 311
 312        /* Check minimum size.  */
 313        if (len < sizeof (struct sockaddr))
 314                return NULL;
 315
 316        /* V4 mapped address are really of AF_INET family */
 317        if (addr->sa.sa_family == AF_INET6 &&
 318            ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
 319                if (!opt->pf->af_supported(AF_INET, opt))
 320                        return NULL;
 321        } else {
 322                /* Does this PF support this AF? */
 323                if (!opt->pf->af_supported(addr->sa.sa_family, opt))
 324                        return NULL;
 325        }
 326
 327        /* If we get this far, af is valid. */
 328        af = sctp_get_af_specific(addr->sa.sa_family);
 329
 330        if (len < af->sockaddr_len)
 331                return NULL;
 332
 333        return af;
 334}
 335
 336/* Bind a local address either to an endpoint or to an association.  */
 337SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
 338{
 339        struct sctp_sock *sp = sctp_sk(sk);
 340        struct sctp_endpoint *ep = sp->ep;
 341        struct sctp_bind_addr *bp = &ep->base.bind_addr;
 342        struct sctp_af *af;
 343        unsigned short snum;
 344        int ret = 0;
 345
 346        /* Common sockaddr verification. */
 347        af = sctp_sockaddr_af(sp, addr, len);
 348        if (!af) {
 349                SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
 350                                  sk, addr, len);
 351                return -EINVAL;
 352        }
 353
 354        snum = ntohs(addr->v4.sin_port);
 355
 356        SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
 357                                 ", port: %d, new port: %d, len: %d)\n",
 358                                 sk,
 359                                 addr,
 360                                 bp->port, snum,
 361                                 len);
 362
 363        /* PF specific bind() address verification. */
 364        if (!sp->pf->bind_verify(sp, addr))
 365                return -EADDRNOTAVAIL;
 366
 367        /* We must either be unbound, or bind to the same port.
 368         * It's OK to allow 0 ports if we are already bound.
 369         * We'll just inhert an already bound port in this case
 370         */
 371        if (bp->port) {
 372                if (!snum)
 373                        snum = bp->port;
 374                else if (snum != bp->port) {
 375                        SCTP_DEBUG_PRINTK("sctp_do_bind:"
 376                                  " New port %d does not match existing port "
 377                                  "%d.\n", snum, bp->port);
 378                        return -EINVAL;
 379                }
 380        }
 381
 382        if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 383                return -EACCES;
 384
 385        /* See if the address matches any of the addresses we may have
 386         * already bound before checking against other endpoints.
 387         */
 388        if (sctp_bind_addr_match(bp, addr, sp))
 389                return -EINVAL;
 390
 391        /* Make sure we are allowed to bind here.
 392         * The function sctp_get_port_local() does duplicate address
 393         * detection.
 394         */
 395        addr->v4.sin_port = htons(snum);
 396        if ((ret = sctp_get_port_local(sk, addr))) {
 397                return -EADDRINUSE;
 398        }
 399
 400        /* Refresh ephemeral port.  */
 401        if (!bp->port)
 402                bp->port = inet_sk(sk)->inet_num;
 403
 404        /* Add the address to the bind address list.
 405         * Use GFP_ATOMIC since BHs will be disabled.
 406         */
 407        ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
 408
 409        /* Copy back into socket for getsockname() use. */
 410        if (!ret) {
 411                inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
 412                af->to_sk_saddr(addr, sk);
 413        }
 414
 415        return ret;
 416}
 417
 418 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
 419 *
 420 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
 421 * at any one time.  If a sender, after sending an ASCONF chunk, decides
 422 * it needs to transfer another ASCONF Chunk, it MUST wait until the
 423 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
 424 * subsequent ASCONF. Note this restriction binds each side, so at any
 425 * time two ASCONF may be in-transit on any given association (one sent
 426 * from each endpoint).
 427 */
 428static int sctp_send_asconf(struct sctp_association *asoc,
 429                            struct sctp_chunk *chunk)
 430{
 431        struct net      *net = sock_net(asoc->base.sk);
 432        int             retval = 0;
 433
 434        /* If there is an outstanding ASCONF chunk, queue it for later
 435         * transmission.
 436         */
 437        if (asoc->addip_last_asconf) {
 438                list_add_tail(&chunk->list, &asoc->addip_chunk_list);
 439                goto out;
 440        }
 441
 442        /* Hold the chunk until an ASCONF_ACK is received. */
 443        sctp_chunk_hold(chunk);
 444        retval = sctp_primitive_ASCONF(net, asoc, chunk);
 445        if (retval)
 446                sctp_chunk_free(chunk);
 447        else
 448                asoc->addip_last_asconf = chunk;
 449
 450out:
 451        return retval;
 452}
 453
 454/* Add a list of addresses as bind addresses to local endpoint or
 455 * association.
 456 *
 457 * Basically run through each address specified in the addrs/addrcnt
 458 * array/length pair, determine if it is IPv6 or IPv4 and call
 459 * sctp_do_bind() on it.
 460 *
 461 * If any of them fails, then the operation will be reversed and the
 462 * ones that were added will be removed.
 463 *
 464 * Only sctp_setsockopt_bindx() is supposed to call this function.
 465 */
 466static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
 467{
 468        int cnt;
 469        int retval = 0;
 470        void *addr_buf;
 471        struct sockaddr *sa_addr;
 472        struct sctp_af *af;
 473
 474        SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
 475                          sk, addrs, addrcnt);
 476
 477        addr_buf = addrs;
 478        for (cnt = 0; cnt < addrcnt; cnt++) {
 479                /* The list may contain either IPv4 or IPv6 address;
 480                 * determine the address length for walking thru the list.
 481                 */
 482                sa_addr = addr_buf;
 483                af = sctp_get_af_specific(sa_addr->sa_family);
 484                if (!af) {
 485                        retval = -EINVAL;
 486                        goto err_bindx_add;
 487                }
 488
 489                retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
 490                                      af->sockaddr_len);
 491
 492                addr_buf += af->sockaddr_len;
 493
 494err_bindx_add:
 495                if (retval < 0) {
 496                        /* Failed. Cleanup the ones that have been added */
 497                        if (cnt > 0)
 498                                sctp_bindx_rem(sk, addrs, cnt);
 499                        return retval;
 500                }
 501        }
 502
 503        return retval;
 504}
 505
 506/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
 507 * associations that are part of the endpoint indicating that a list of local
 508 * addresses are added to the endpoint.
 509 *
 510 * If any of the addresses is already in the bind address list of the
 511 * association, we do not send the chunk for that association.  But it will not
 512 * affect other associations.
 513 *
 514 * Only sctp_setsockopt_bindx() is supposed to call this function.
 515 */
 516static int sctp_send_asconf_add_ip(struct sock          *sk,
 517                                   struct sockaddr      *addrs,
 518                                   int                  addrcnt)
 519{
 520        struct net *net = sock_net(sk);
 521        struct sctp_sock                *sp;
 522        struct sctp_endpoint            *ep;
 523        struct sctp_association         *asoc;
 524        struct sctp_bind_addr           *bp;
 525        struct sctp_chunk               *chunk;
 526        struct sctp_sockaddr_entry      *laddr;
 527        union sctp_addr                 *addr;
 528        union sctp_addr                 saveaddr;
 529        void                            *addr_buf;
 530        struct sctp_af                  *af;
 531        struct list_head                *p;
 532        int                             i;
 533        int                             retval = 0;
 534
 535        if (!net->sctp.addip_enable)
 536                return retval;
 537
 538        sp = sctp_sk(sk);
 539        ep = sp->ep;
 540
 541        SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
 542                          __func__, sk, addrs, addrcnt);
 543
 544        list_for_each_entry(asoc, &ep->asocs, asocs) {
 545
 546                if (!asoc->peer.asconf_capable)
 547                        continue;
 548
 549                if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
 550                        continue;
 551
 552                if (!sctp_state(asoc, ESTABLISHED))
 553                        continue;
 554
 555                /* Check if any address in the packed array of addresses is
 556                 * in the bind address list of the association. If so,
 557                 * do not send the asconf chunk to its peer, but continue with
 558                 * other associations.
 559                 */
 560                addr_buf = addrs;
 561                for (i = 0; i < addrcnt; i++) {
 562                        addr = addr_buf;
 563                        af = sctp_get_af_specific(addr->v4.sin_family);
 564                        if (!af) {
 565                                retval = -EINVAL;
 566                                goto out;
 567                        }
 568
 569                        if (sctp_assoc_lookup_laddr(asoc, addr))
 570                                break;
 571
 572                        addr_buf += af->sockaddr_len;
 573                }
 574                if (i < addrcnt)
 575                        continue;
 576
 577                /* Use the first valid address in bind addr list of
 578                 * association as Address Parameter of ASCONF CHUNK.
 579                 */
 580                bp = &asoc->base.bind_addr;
 581                p = bp->address_list.next;
 582                laddr = list_entry(p, struct sctp_sockaddr_entry, list);
 583                chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
 584                                                   addrcnt, SCTP_PARAM_ADD_IP);
 585                if (!chunk) {
 586                        retval = -ENOMEM;
 587                        goto out;
 588                }
 589
 590                /* Add the new addresses to the bind address list with
 591                 * use_as_src set to 0.
 592                 */
 593                addr_buf = addrs;
 594                for (i = 0; i < addrcnt; i++) {
 595                        addr = addr_buf;
 596                        af = sctp_get_af_specific(addr->v4.sin_family);
 597                        memcpy(&saveaddr, addr, af->sockaddr_len);
 598                        retval = sctp_add_bind_addr(bp, &saveaddr,
 599                                                    SCTP_ADDR_NEW, GFP_ATOMIC);
 600                        addr_buf += af->sockaddr_len;
 601                }
 602                if (asoc->src_out_of_asoc_ok) {
 603                        struct sctp_transport *trans;
 604
 605                        list_for_each_entry(trans,
 606                            &asoc->peer.transport_addr_list, transports) {
 607                                /* Clear the source and route cache */
 608                                dst_release(trans->dst);
 609                                trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
 610                                    2*asoc->pathmtu, 4380));
 611                                trans->ssthresh = asoc->peer.i.a_rwnd;
 612                                trans->rto = asoc->rto_initial;
 613                                trans->rtt = trans->srtt = trans->rttvar = 0;
 614                                sctp_transport_route(trans, NULL,
 615                                    sctp_sk(asoc->base.sk));
 616                        }
 617                }
 618                retval = sctp_send_asconf(asoc, chunk);
 619        }
 620
 621out:
 622        return retval;
 623}
 624
 625/* Remove a list of addresses from bind addresses list.  Do not remove the
 626 * last address.
 627 *
 628 * Basically run through each address specified in the addrs/addrcnt
 629 * array/length pair, determine if it is IPv6 or IPv4 and call
 630 * sctp_del_bind() on it.
 631 *
 632 * If any of them fails, then the operation will be reversed and the
 633 * ones that were removed will be added back.
 634 *
 635 * At least one address has to be left; if only one address is
 636 * available, the operation will return -EBUSY.
 637 *
 638 * Only sctp_setsockopt_bindx() is supposed to call this function.
 639 */
 640static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
 641{
 642        struct sctp_sock *sp = sctp_sk(sk);
 643        struct sctp_endpoint *ep = sp->ep;
 644        int cnt;
 645        struct sctp_bind_addr *bp = &ep->base.bind_addr;
 646        int retval = 0;
 647        void *addr_buf;
 648        union sctp_addr *sa_addr;
 649        struct sctp_af *af;
 650
 651        SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
 652                          sk, addrs, addrcnt);
 653
 654        addr_buf = addrs;
 655        for (cnt = 0; cnt < addrcnt; cnt++) {
 656                /* If the bind address list is empty or if there is only one
 657                 * bind address, there is nothing more to be removed (we need
 658                 * at least one address here).
 659                 */
 660                if (list_empty(&bp->address_list) ||
 661                    (sctp_list_single_entry(&bp->address_list))) {
 662                        retval = -EBUSY;
 663                        goto err_bindx_rem;
 664                }
 665
 666                sa_addr = addr_buf;
 667                af = sctp_get_af_specific(sa_addr->sa.sa_family);
 668                if (!af) {
 669                        retval = -EINVAL;
 670                        goto err_bindx_rem;
 671                }
 672
 673                if (!af->addr_valid(sa_addr, sp, NULL)) {
 674                        retval = -EADDRNOTAVAIL;
 675                        goto err_bindx_rem;
 676                }
 677
 678                if (sa_addr->v4.sin_port &&
 679                    sa_addr->v4.sin_port != htons(bp->port)) {
 680                        retval = -EINVAL;
 681                        goto err_bindx_rem;
 682                }
 683
 684                if (!sa_addr->v4.sin_port)
 685                        sa_addr->v4.sin_port = htons(bp->port);
 686
 687                /* FIXME - There is probably a need to check if sk->sk_saddr and
 688                 * sk->sk_rcv_addr are currently set to one of the addresses to
 689                 * be removed. This is something which needs to be looked into
 690                 * when we are fixing the outstanding issues with multi-homing
 691                 * socket routing and failover schemes. Refer to comments in
 692                 * sctp_do_bind(). -daisy
 693                 */
 694                retval = sctp_del_bind_addr(bp, sa_addr);
 695
 696                addr_buf += af->sockaddr_len;
 697err_bindx_rem:
 698                if (retval < 0) {
 699                        /* Failed. Add the ones that has been removed back */
 700                        if (cnt > 0)
 701                                sctp_bindx_add(sk, addrs, cnt);
 702                        return retval;
 703                }
 704        }
 705
 706        return retval;
 707}
 708
 709/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
 710 * the associations that are part of the endpoint indicating that a list of
 711 * local addresses are removed from the endpoint.
 712 *
 713 * If any of the addresses is already in the bind address list of the
 714 * association, we do not send the chunk for that association.  But it will not
 715 * affect other associations.
 716 *
 717 * Only sctp_setsockopt_bindx() is supposed to call this function.
 718 */
 719static int sctp_send_asconf_del_ip(struct sock          *sk,
 720                                   struct sockaddr      *addrs,
 721                                   int                  addrcnt)
 722{
 723        struct net *net = sock_net(sk);
 724        struct sctp_sock        *sp;
 725        struct sctp_endpoint    *ep;
 726        struct sctp_association *asoc;
 727        struct sctp_transport   *transport;
 728        struct sctp_bind_addr   *bp;
 729        struct sctp_chunk       *chunk;
 730        union sctp_addr         *laddr;
 731        void                    *addr_buf;
 732        struct sctp_af          *af;
 733        struct sctp_sockaddr_entry *saddr;
 734        int                     i;
 735        int                     retval = 0;
 736        int                     stored = 0;
 737
 738        chunk = NULL;
 739        if (!net->sctp.addip_enable)
 740                return retval;
 741
 742        sp = sctp_sk(sk);
 743        ep = sp->ep;
 744
 745        SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
 746                          __func__, sk, addrs, addrcnt);
 747
 748        list_for_each_entry(asoc, &ep->asocs, asocs) {
 749
 750                if (!asoc->peer.asconf_capable)
 751                        continue;
 752
 753                if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
 754                        continue;
 755
 756                if (!sctp_state(asoc, ESTABLISHED))
 757                        continue;
 758
 759                /* Check if any address in the packed array of addresses is
 760                 * not present in the bind address list of the association.
 761                 * If so, do not send the asconf chunk to its peer, but
 762                 * continue with other associations.
 763                 */
 764                addr_buf = addrs;
 765                for (i = 0; i < addrcnt; i++) {
 766                        laddr = addr_buf;
 767                        af = sctp_get_af_specific(laddr->v4.sin_family);
 768                        if (!af) {
 769                                retval = -EINVAL;
 770                                goto out;
 771                        }
 772
 773                        if (!sctp_assoc_lookup_laddr(asoc, laddr))
 774                                break;
 775
 776                        addr_buf += af->sockaddr_len;
 777                }
 778                if (i < addrcnt)
 779                        continue;
 780
 781                /* Find one address in the association's bind address list
 782                 * that is not in the packed array of addresses. This is to
 783                 * make sure that we do not delete all the addresses in the
 784                 * association.
 785                 */
 786                bp = &asoc->base.bind_addr;
 787                laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
 788                                               addrcnt, sp);
 789                if ((laddr == NULL) && (addrcnt == 1)) {
 790                        if (asoc->asconf_addr_del_pending)
 791                                continue;
 792                        asoc->asconf_addr_del_pending =
 793                            kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
 794                        if (asoc->asconf_addr_del_pending == NULL) {
 795                                retval = -ENOMEM;
 796                                goto out;
 797                        }
 798                        asoc->asconf_addr_del_pending->sa.sa_family =
 799                                    addrs->sa_family;
 800                        asoc->asconf_addr_del_pending->v4.sin_port =
 801                                    htons(bp->port);
 802                        if (addrs->sa_family == AF_INET) {
 803                                struct sockaddr_in *sin;
 804
 805                                sin = (struct sockaddr_in *)addrs;
 806                                asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
 807                        } else if (addrs->sa_family == AF_INET6) {
 808                                struct sockaddr_in6 *sin6;
 809
 810                                sin6 = (struct sockaddr_in6 *)addrs;
 811                                asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
 812                        }
 813                        SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
 814                            " at %p\n", asoc, asoc->asconf_addr_del_pending,
 815                            asoc->asconf_addr_del_pending);
 816                        asoc->src_out_of_asoc_ok = 1;
 817                        stored = 1;
 818                        goto skip_mkasconf;
 819                }
 820
 821                /* We do not need RCU protection throughout this loop
 822                 * because this is done under a socket lock from the
 823                 * setsockopt call.
 824                 */
 825                chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
 826                                                   SCTP_PARAM_DEL_IP);
 827                if (!chunk) {
 828                        retval = -ENOMEM;
 829                        goto out;
 830                }
 831
 832skip_mkasconf:
 833                /* Reset use_as_src flag for the addresses in the bind address
 834                 * list that are to be deleted.
 835                 */
 836                addr_buf = addrs;
 837                for (i = 0; i < addrcnt; i++) {
 838                        laddr = addr_buf;
 839                        af = sctp_get_af_specific(laddr->v4.sin_family);
 840                        list_for_each_entry(saddr, &bp->address_list, list) {
 841                                if (sctp_cmp_addr_exact(&saddr->a, laddr))
 842                                        saddr->state = SCTP_ADDR_DEL;
 843                        }
 844                        addr_buf += af->sockaddr_len;
 845                }
 846
 847                /* Update the route and saddr entries for all the transports
 848                 * as some of the addresses in the bind address list are
 849                 * about to be deleted and cannot be used as source addresses.
 850                 */
 851                list_for_each_entry(transport, &asoc->peer.transport_addr_list,
 852                                        transports) {
 853                        dst_release(transport->dst);
 854                        sctp_transport_route(transport, NULL,
 855                                             sctp_sk(asoc->base.sk));
 856                }
 857
 858                if (stored)
 859                        /* We don't need to transmit ASCONF */
 860                        continue;
 861                retval = sctp_send_asconf(asoc, chunk);
 862        }
 863out:
 864        return retval;
 865}
 866
 867/* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
 868int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
 869{
 870        struct sock *sk = sctp_opt2sk(sp);
 871        union sctp_addr *addr;
 872        struct sctp_af *af;
 873
 874        /* It is safe to write port space in caller. */
 875        addr = &addrw->a;
 876        addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
 877        af = sctp_get_af_specific(addr->sa.sa_family);
 878        if (!af)
 879                return -EINVAL;
 880        if (sctp_verify_addr(sk, addr, af->sockaddr_len))
 881                return -EINVAL;
 882
 883        if (addrw->state == SCTP_ADDR_NEW)
 884                return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
 885        else
 886                return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
 887}
 888
 889/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
 890 *
 891 * API 8.1
 892 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
 893 *                int flags);
 894 *
 895 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
 896 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
 897 * or IPv6 addresses.
 898 *
 899 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
 900 * Section 3.1.2 for this usage.
 901 *
 902 * addrs is a pointer to an array of one or more socket addresses. Each
 903 * address is contained in its appropriate structure (i.e. struct
 904 * sockaddr_in or struct sockaddr_in6) the family of the address type
 905 * must be used to distinguish the address length (note that this
 906 * representation is termed a "packed array" of addresses). The caller
 907 * specifies the number of addresses in the array with addrcnt.
 908 *
 909 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
 910 * -1, and sets errno to the appropriate error code.
 911 *
 912 * For SCTP, the port given in each socket address must be the same, or
 913 * sctp_bindx() will fail, setting errno to EINVAL.
 914 *
 915 * The flags parameter is formed from the bitwise OR of zero or more of
 916 * the following currently defined flags:
 917 *
 918 * SCTP_BINDX_ADD_ADDR
 919 *
 920 * SCTP_BINDX_REM_ADDR
 921 *
 922 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
 923 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
 924 * addresses from the association. The two flags are mutually exclusive;
 925 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
 926 * not remove all addresses from an association; sctp_bindx() will
 927 * reject such an attempt with EINVAL.
 928 *
 929 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
 930 * additional addresses with an endpoint after calling bind().  Or use
 931 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
 932 * socket is associated with so that no new association accepted will be
 933 * associated with those addresses. If the endpoint supports dynamic
 934 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
 935 * endpoint to send the appropriate message to the peer to change the
 936 * peers address lists.
 937 *
 938 * Adding and removing addresses from a connected association is
 939 * optional functionality. Implementations that do not support this
 940 * functionality should return EOPNOTSUPP.
 941 *
 942 * Basically do nothing but copying the addresses from user to kernel
 943 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
 944 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
 945 * from userspace.
 946 *
 947 * We don't use copy_from_user() for optimization: we first do the
 948 * sanity checks (buffer size -fast- and access check-healthy
 949 * pointer); if all of those succeed, then we can alloc the memory
 950 * (expensive operation) needed to copy the data to kernel. Then we do
 951 * the copying without checking the user space area
 952 * (__copy_from_user()).
 953 *
 954 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 955 * it.
 956 *
 957 * sk        The sk of the socket
 958 * addrs     The pointer to the addresses in user land
 959 * addrssize Size of the addrs buffer
 960 * op        Operation to perform (add or remove, see the flags of
 961 *           sctp_bindx)
 962 *
 963 * Returns 0 if ok, <0 errno code on error.
 964 */
 965SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
 966                                      struct sockaddr __user *addrs,
 967                                      int addrs_size, int op)
 968{
 969        struct sockaddr *kaddrs;
 970        int err;
 971        int addrcnt = 0;
 972        int walk_size = 0;
 973        struct sockaddr *sa_addr;
 974        void *addr_buf;
 975        struct sctp_af *af;
 976
 977        SCTP_DEBUG_PRINTK("sctp_setsockopt_bindx: sk %p addrs %p"
 978                          " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
 979
 980        if (unlikely(addrs_size <= 0))
 981                return -EINVAL;
 982
 983        /* Check the user passed a healthy pointer.  */
 984        if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
 985                return -EFAULT;
 986
 987        /* Alloc space for the address array in kernel memory.  */
 988        kaddrs = kmalloc(addrs_size, GFP_KERNEL);
 989        if (unlikely(!kaddrs))
 990                return -ENOMEM;
 991
 992        if (__copy_from_user(kaddrs, addrs, addrs_size)) {
 993                kfree(kaddrs);
 994                return -EFAULT;
 995        }
 996
 997        /* Walk through the addrs buffer and count the number of addresses. */
 998        addr_buf = kaddrs;
 999        while (walk_size < addrs_size) {
1000                if (walk_size + sizeof(sa_family_t) > addrs_size) {
1001                        kfree(kaddrs);
1002                        return -EINVAL;
1003                }
1004
1005                sa_addr = addr_buf;
1006                af = sctp_get_af_specific(sa_addr->sa_family);
1007
1008                /* If the address family is not supported or if this address
1009                 * causes the address buffer to overflow return EINVAL.
1010                 */
1011                if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1012                        kfree(kaddrs);
1013                        return -EINVAL;
1014                }
1015                addrcnt++;
1016                addr_buf += af->sockaddr_len;
1017                walk_size += af->sockaddr_len;
1018        }
1019
1020        /* Do the work. */
1021        switch (op) {
1022        case SCTP_BINDX_ADD_ADDR:
1023                err = sctp_bindx_add(sk, kaddrs, addrcnt);
1024                if (err)
1025                        goto out;
1026                err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1027                break;
1028
1029        case SCTP_BINDX_REM_ADDR:
1030                err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1031                if (err)
1032                        goto out;
1033                err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1034                break;
1035
1036        default:
1037                err = -EINVAL;
1038                break;
1039        }
1040
1041out:
1042        kfree(kaddrs);
1043
1044        return err;
1045}
1046
1047/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1048 *
1049 * Common routine for handling connect() and sctp_connectx().
1050 * Connect will come in with just a single address.
1051 */
1052static int __sctp_connect(struct sock* sk,
1053                          struct sockaddr *kaddrs,
1054                          int addrs_size,
1055                          sctp_assoc_t *assoc_id)
1056{
1057        struct net *net = sock_net(sk);
1058        struct sctp_sock *sp;
1059        struct sctp_endpoint *ep;
1060        struct sctp_association *asoc = NULL;
1061        struct sctp_association *asoc2;
1062        struct sctp_transport *transport;
1063        union sctp_addr to;
1064        struct sctp_af *af;
1065        sctp_scope_t scope;
1066        long timeo;
1067        int err = 0;
1068        int addrcnt = 0;
1069        int walk_size = 0;
1070        union sctp_addr *sa_addr = NULL;
1071        void *addr_buf;
1072        unsigned short port;
1073        unsigned int f_flags = 0;
1074
1075        sp = sctp_sk(sk);
1076        ep = sp->ep;
1077
1078        /* connect() cannot be done on a socket that is already in ESTABLISHED
1079         * state - UDP-style peeled off socket or a TCP-style socket that
1080         * is already connected.
1081         * It cannot be done even on a TCP-style listening socket.
1082         */
1083        if (sctp_sstate(sk, ESTABLISHED) ||
1084            (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1085                err = -EISCONN;
1086                goto out_free;
1087        }
1088
1089        /* Walk through the addrs buffer and count the number of addresses. */
1090        addr_buf = kaddrs;
1091        while (walk_size < addrs_size) {
1092                if (walk_size + sizeof(sa_family_t) > addrs_size) {
1093                        err = -EINVAL;
1094                        goto out_free;
1095                }
1096
1097                sa_addr = addr_buf;
1098                af = sctp_get_af_specific(sa_addr->sa.sa_family);
1099
1100                /* If the address family is not supported or if this address
1101                 * causes the address buffer to overflow return EINVAL.
1102                 */
1103                if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1104                        err = -EINVAL;
1105                        goto out_free;
1106                }
1107
1108                port = ntohs(sa_addr->v4.sin_port);
1109
1110                /* Save current address so we can work with it */
1111                memcpy(&to, sa_addr, af->sockaddr_len);
1112
1113                err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1114                if (err)
1115                        goto out_free;
1116
1117                /* Make sure the destination port is correctly set
1118                 * in all addresses.
1119                 */
1120                if (asoc && asoc->peer.port && asoc->peer.port != port)
1121                        goto out_free;
1122
1123
1124                /* Check if there already is a matching association on the
1125                 * endpoint (other than the one created here).
1126                 */
1127                asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1128                if (asoc2 && asoc2 != asoc) {
1129                        if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1130                                err = -EISCONN;
1131                        else
1132                                err = -EALREADY;
1133                        goto out_free;
1134                }
1135
1136                /* If we could not find a matching association on the endpoint,
1137                 * make sure that there is no peeled-off association matching
1138                 * the peer address even on another socket.
1139                 */
1140                if (sctp_endpoint_is_peeled_off(ep, &to)) {
1141                        err = -EADDRNOTAVAIL;
1142                        goto out_free;
1143                }
1144
1145                if (!asoc) {
1146                        /* If a bind() or sctp_bindx() is not called prior to
1147                         * an sctp_connectx() call, the system picks an
1148                         * ephemeral port and will choose an address set
1149                         * equivalent to binding with a wildcard address.
1150                         */
1151                        if (!ep->base.bind_addr.port) {
1152                                if (sctp_autobind(sk)) {
1153                                        err = -EAGAIN;
1154                                        goto out_free;
1155                                }
1156                        } else {
1157                                /*
1158                                 * If an unprivileged user inherits a 1-many
1159                                 * style socket with open associations on a
1160                                 * privileged port, it MAY be permitted to
1161                                 * accept new associations, but it SHOULD NOT
1162                                 * be permitted to open new associations.
1163                                 */
1164                                if (ep->base.bind_addr.port < PROT_SOCK &&
1165                                    !capable(CAP_NET_BIND_SERVICE)) {
1166                                        err = -EACCES;
1167                                        goto out_free;
1168                                }
1169                        }
1170
1171                        scope = sctp_scope(&to);
1172                        asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1173                        if (!asoc) {
1174                                err = -ENOMEM;
1175                                goto out_free;
1176                        }
1177
1178                        err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1179                                                              GFP_KERNEL);
1180                        if (err < 0) {
1181                                goto out_free;
1182                        }
1183
1184                }
1185
1186                /* Prime the peer's transport structures.  */
1187                transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1188                                                SCTP_UNKNOWN);
1189                if (!transport) {
1190                        err = -ENOMEM;
1191                        goto out_free;
1192                }
1193
1194                addrcnt++;
1195                addr_buf += af->sockaddr_len;
1196                walk_size += af->sockaddr_len;
1197        }
1198
1199        /* In case the user of sctp_connectx() wants an association
1200         * id back, assign one now.
1201         */
1202        if (assoc_id) {
1203                err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1204                if (err < 0)
1205                        goto out_free;
1206        }
1207
1208        err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1209        if (err < 0) {
1210                goto out_free;
1211        }
1212
1213        /* Initialize sk's dport and daddr for getpeername() */
1214        inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1215        af = sctp_get_af_specific(sa_addr->sa.sa_family);
1216        af->to_sk_daddr(sa_addr, sk);
1217        sk->sk_err = 0;
1218
1219        /* in-kernel sockets don't generally have a file allocated to them
1220         * if all they do is call sock_create_kern().
1221         */
1222        if (sk->sk_socket->file)
1223                f_flags = sk->sk_socket->file->f_flags;
1224
1225        timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1226
1227        err = sctp_wait_for_connect(asoc, &timeo);
1228        if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1229                *assoc_id = asoc->assoc_id;
1230
1231        /* Don't free association on exit. */
1232        asoc = NULL;
1233
1234out_free:
1235
1236        SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1237                          " kaddrs: %p err: %d\n",
1238                          asoc, kaddrs, err);
1239        if (asoc) {
1240                /* sctp_primitive_ASSOCIATE may have added this association
1241                 * To the hash table, try to unhash it, just in case, its a noop
1242                 * if it wasn't hashed so we're safe
1243                 */
1244                sctp_unhash_established(asoc);
1245                sctp_association_free(asoc);
1246        }
1247        return err;
1248}
1249
1250/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1251 *
1252 * API 8.9
1253 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1254 *                      sctp_assoc_t *asoc);
1255 *
1256 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1257 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1258 * or IPv6 addresses.
1259 *
1260 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1261 * Section 3.1.2 for this usage.
1262 *
1263 * addrs is a pointer to an array of one or more socket addresses. Each
1264 * address is contained in its appropriate structure (i.e. struct
1265 * sockaddr_in or struct sockaddr_in6) the family of the address type
1266 * must be used to distengish the address length (note that this
1267 * representation is termed a "packed array" of addresses). The caller
1268 * specifies the number of addresses in the array with addrcnt.
1269 *
1270 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1271 * the association id of the new association.  On failure, sctp_connectx()
1272 * returns -1, and sets errno to the appropriate error code.  The assoc_id
1273 * is not touched by the kernel.
1274 *
1275 * For SCTP, the port given in each socket address must be the same, or
1276 * sctp_connectx() will fail, setting errno to EINVAL.
1277 *
1278 * An application can use sctp_connectx to initiate an association with
1279 * an endpoint that is multi-homed.  Much like sctp_bindx() this call
1280 * allows a caller to specify multiple addresses at which a peer can be
1281 * reached.  The way the SCTP stack uses the list of addresses to set up
1282 * the association is implementation dependent.  This function only
1283 * specifies that the stack will try to make use of all the addresses in
1284 * the list when needed.
1285 *
1286 * Note that the list of addresses passed in is only used for setting up
1287 * the association.  It does not necessarily equal the set of addresses
1288 * the peer uses for the resulting association.  If the caller wants to
1289 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1290 * retrieve them after the association has been set up.
1291 *
1292 * Basically do nothing but copying the addresses from user to kernel
1293 * land and invoking either sctp_connectx(). This is used for tunneling
1294 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1295 *
1296 * We don't use copy_from_user() for optimization: we first do the
1297 * sanity checks (buffer size -fast- and access check-healthy
1298 * pointer); if all of those succeed, then we can alloc the memory
1299 * (expensive operation) needed to copy the data to kernel. Then we do
1300 * the copying without checking the user space area
1301 * (__copy_from_user()).
1302 *
1303 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1304 * it.
1305 *
1306 * sk        The sk of the socket
1307 * addrs     The pointer to the addresses in user land
1308 * addrssize Size of the addrs buffer
1309 *
1310 * Returns >=0 if ok, <0 errno code on error.
1311 */
1312SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1313                                      struct sockaddr __user *addrs,
1314                                      int addrs_size,
1315                                      sctp_assoc_t *assoc_id)
1316{
1317        int err = 0;
1318        struct sockaddr *kaddrs;
1319
1320        SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1321                          __func__, sk, addrs, addrs_size);
1322
1323        if (unlikely(addrs_size <= 0))
1324                return -EINVAL;
1325
1326        /* Check the user passed a healthy pointer.  */
1327        if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1328                return -EFAULT;
1329
1330        /* Alloc space for the address array in kernel memory.  */
1331        kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1332        if (unlikely(!kaddrs))
1333                return -ENOMEM;
1334
1335        if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1336                err = -EFAULT;
1337        } else {
1338                err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1339        }
1340
1341        kfree(kaddrs);
1342
1343        return err;
1344}
1345
1346/*
1347 * This is an older interface.  It's kept for backward compatibility
1348 * to the option that doesn't provide association id.
1349 */
1350SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1351                                      struct sockaddr __user *addrs,
1352                                      int addrs_size)
1353{
1354        return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1355}
1356
1357/*
1358 * New interface for the API.  The since the API is done with a socket
1359 * option, to make it simple we feed back the association id is as a return
1360 * indication to the call.  Error is always negative and association id is
1361 * always positive.
1362 */
1363SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1364                                      struct sockaddr __user *addrs,
1365                                      int addrs_size)
1366{
1367        sctp_assoc_t assoc_id = 0;
1368        int err = 0;
1369
1370        err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1371
1372        if (err)
1373                return err;
1374        else
1375                return assoc_id;
1376}
1377
1378/*
1379 * New (hopefully final) interface for the API.
1380 * We use the sctp_getaddrs_old structure so that use-space library
1381 * can avoid any unnecessary allocations.   The only defferent part
1382 * is that we store the actual length of the address buffer into the
1383 * addrs_num structure member.  That way we can re-use the existing
1384 * code.
1385 */
1386SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1387                                        char __user *optval,
1388                                        int __user *optlen)
1389{
1390        struct sctp_getaddrs_old param;
1391        sctp_assoc_t assoc_id = 0;
1392        int err = 0;
1393
1394        if (len < sizeof(param))
1395                return -EINVAL;
1396
1397        if (copy_from_user(&param, optval, sizeof(param)))
1398                return -EFAULT;
1399
1400        err = __sctp_setsockopt_connectx(sk,
1401                        (struct sockaddr __user *)param.addrs,
1402                        param.addr_num, &assoc_id);
1403
1404        if (err == 0 || err == -EINPROGRESS) {
1405                if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1406                        return -EFAULT;
1407                if (put_user(sizeof(assoc_id), optlen))
1408                        return -EFAULT;
1409        }
1410
1411        return err;
1412}
1413
1414/* API 3.1.4 close() - UDP Style Syntax
1415 * Applications use close() to perform graceful shutdown (as described in
1416 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1417 * by a UDP-style socket.
1418 *
1419 * The syntax is
1420 *
1421 *   ret = close(int sd);
1422 *
1423 *   sd      - the socket descriptor of the associations to be closed.
1424 *
1425 * To gracefully shutdown a specific association represented by the
1426 * UDP-style socket, an application should use the sendmsg() call,
1427 * passing no user data, but including the appropriate flag in the
1428 * ancillary data (see Section xxxx).
1429 *
1430 * If sd in the close() call is a branched-off socket representing only
1431 * one association, the shutdown is performed on that association only.
1432 *
1433 * 4.1.6 close() - TCP Style Syntax
1434 *
1435 * Applications use close() to gracefully close down an association.
1436 *
1437 * The syntax is:
1438 *
1439 *    int close(int sd);
1440 *
1441 *      sd      - the socket descriptor of the association to be closed.
1442 *
1443 * After an application calls close() on a socket descriptor, no further
1444 * socket operations will succeed on that descriptor.
1445 *
1446 * API 7.1.4 SO_LINGER
1447 *
1448 * An application using the TCP-style socket can use this option to
1449 * perform the SCTP ABORT primitive.  The linger option structure is:
1450 *
1451 *  struct  linger {
1452 *     int     l_onoff;                // option on/off
1453 *     int     l_linger;               // linger time
1454 * };
1455 *
1456 * To enable the option, set l_onoff to 1.  If the l_linger value is set
1457 * to 0, calling close() is the same as the ABORT primitive.  If the
1458 * value is set to a negative value, the setsockopt() call will return
1459 * an error.  If the value is set to a positive value linger_time, the
1460 * close() can be blocked for at most linger_time ms.  If the graceful
1461 * shutdown phase does not finish during this period, close() will
1462 * return but the graceful shutdown phase continues in the system.
1463 */
1464SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1465{
1466        struct net *net = sock_net(sk);
1467        struct sctp_endpoint *ep;
1468        struct sctp_association *asoc;
1469        struct list_head *pos, *temp;
1470        unsigned int data_was_unread;
1471
1472        SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1473
1474        sctp_lock_sock(sk);
1475        sk->sk_shutdown = SHUTDOWN_MASK;
1476        sk->sk_state = SCTP_SS_CLOSING;
1477
1478        ep = sctp_sk(sk)->ep;
1479
1480        /* Clean up any skbs sitting on the receive queue.  */
1481        data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1482        data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1483
1484        /* Walk all associations on an endpoint.  */
1485        list_for_each_safe(pos, temp, &ep->asocs) {
1486                asoc = list_entry(pos, struct sctp_association, asocs);
1487
1488                if (sctp_style(sk, TCP)) {
1489                        /* A closed association can still be in the list if
1490                         * it belongs to a TCP-style listening socket that is
1491                         * not yet accepted. If so, free it. If not, send an
1492                         * ABORT or SHUTDOWN based on the linger options.
1493                         */
1494                        if (sctp_state(asoc, CLOSED)) {
1495                                sctp_unhash_established(asoc);
1496                                sctp_association_free(asoc);
1497                                continue;
1498                        }
1499                }
1500
1501                if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1502                    !skb_queue_empty(&asoc->ulpq.reasm) ||
1503                    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1504                        struct sctp_chunk *chunk;
1505
1506                        chunk = sctp_make_abort_user(asoc, NULL, 0);
1507                        if (chunk)
1508                                sctp_primitive_ABORT(net, asoc, chunk);
1509                } else
1510                        sctp_primitive_SHUTDOWN(net, asoc, NULL);
1511        }
1512
1513        /* On a TCP-style socket, block for at most linger_time if set. */
1514        if (sctp_style(sk, TCP) && timeout)
1515                sctp_wait_for_close(sk, timeout);
1516
1517        /* This will run the backlog queue.  */
1518        sctp_release_sock(sk);
1519
1520        /* Supposedly, no process has access to the socket, but
1521         * the net layers still may.
1522         */
1523        sctp_local_bh_disable();
1524        sctp_bh_lock_sock(sk);
1525
1526        /* Hold the sock, since sk_common_release() will put sock_put()
1527         * and we have just a little more cleanup.
1528         */
1529        sock_hold(sk);
1530        sk_common_release(sk);
1531
1532        sctp_bh_unlock_sock(sk);
1533        sctp_local_bh_enable();
1534
1535        sock_put(sk);
1536
1537        SCTP_DBG_OBJCNT_DEC(sock);
1538}
1539
1540/* Handle EPIPE error. */
1541static int sctp_error(struct sock *sk, int flags, int err)
1542{
1543        if (err == -EPIPE)
1544                err = sock_error(sk) ? : -EPIPE;
1545        if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1546                send_sig(SIGPIPE, current, 0);
1547        return err;
1548}
1549
1550/* API 3.1.3 sendmsg() - UDP Style Syntax
1551 *
1552 * An application uses sendmsg() and recvmsg() calls to transmit data to
1553 * and receive data from its peer.
1554 *
1555 *  ssize_t sendmsg(int socket, const struct msghdr *message,
1556 *                  int flags);
1557 *
1558 *  socket  - the socket descriptor of the endpoint.
1559 *  message - pointer to the msghdr structure which contains a single
1560 *            user message and possibly some ancillary data.
1561 *
1562 *            See Section 5 for complete description of the data
1563 *            structures.
1564 *
1565 *  flags   - flags sent or received with the user message, see Section
1566 *            5 for complete description of the flags.
1567 *
1568 * Note:  This function could use a rewrite especially when explicit
1569 * connect support comes in.
1570 */
1571/* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */
1572
1573SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1574
1575SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1576                             struct msghdr *msg, size_t msg_len)
1577{
1578        struct net *net = sock_net(sk);
1579        struct sctp_sock *sp;
1580        struct sctp_endpoint *ep;
1581        struct sctp_association *new_asoc=NULL, *asoc=NULL;
1582        struct sctp_transport *transport, *chunk_tp;
1583        struct sctp_chunk *chunk;
1584        union sctp_addr to;
1585        struct sockaddr *msg_name = NULL;
1586        struct sctp_sndrcvinfo default_sinfo;
1587        struct sctp_sndrcvinfo *sinfo;
1588        struct sctp_initmsg *sinit;
1589        sctp_assoc_t associd = 0;
1590        sctp_cmsgs_t cmsgs = { NULL };
1591        int err;
1592        sctp_scope_t scope;
1593        long timeo;
1594        __u16 sinfo_flags = 0;
1595        struct sctp_datamsg *datamsg;
1596        int msg_flags = msg->msg_flags;
1597
1598        SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1599                          sk, msg, msg_len);
1600
1601        err = 0;
1602        sp = sctp_sk(sk);
1603        ep = sp->ep;
1604
1605        SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1606
1607        /* We cannot send a message over a TCP-style listening socket. */
1608        if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1609                err = -EPIPE;
1610                goto out_nounlock;
1611        }
1612
1613        /* Parse out the SCTP CMSGs.  */
1614        err = sctp_msghdr_parse(msg, &cmsgs);
1615
1616        if (err) {
1617                SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1618                goto out_nounlock;
1619        }
1620
1621        /* Fetch the destination address for this packet.  This
1622         * address only selects the association--it is not necessarily
1623         * the address we will send to.
1624         * For a peeled-off socket, msg_name is ignored.
1625         */
1626        if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1627                int msg_namelen = msg->msg_namelen;
1628
1629                err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1630                                       msg_namelen);
1631                if (err)
1632                        return err;
1633
1634                if (msg_namelen > sizeof(to))
1635                        msg_namelen = sizeof(to);
1636                memcpy(&to, msg->msg_name, msg_namelen);
1637                msg_name = msg->msg_name;
1638        }
1639
1640        sinfo = cmsgs.info;
1641        sinit = cmsgs.init;
1642
1643        /* Did the user specify SNDRCVINFO?  */
1644        if (sinfo) {
1645                sinfo_flags = sinfo->sinfo_flags;
1646                associd = sinfo->sinfo_assoc_id;
1647        }
1648
1649        SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1650                          msg_len, sinfo_flags);
1651
1652        /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1653        if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1654                err = -EINVAL;
1655                goto out_nounlock;
1656        }
1657
1658        /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1659         * length messages when SCTP_EOF|SCTP_ABORT is not set.
1660         * If SCTP_ABORT is set, the message length could be non zero with
1661         * the msg_iov set to the user abort reason.
1662         */
1663        if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1664            (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1665                err = -EINVAL;
1666                goto out_nounlock;
1667        }
1668
1669        /* If SCTP_ADDR_OVER is set, there must be an address
1670         * specified in msg_name.
1671         */
1672        if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1673                err = -EINVAL;
1674                goto out_nounlock;
1675        }
1676
1677        transport = NULL;
1678
1679        SCTP_DEBUG_PRINTK("About to look up association.\n");
1680
1681        sctp_lock_sock(sk);
1682
1683        /* If a msg_name has been specified, assume this is to be used.  */
1684        if (msg_name) {
1685                /* Look for a matching association on the endpoint. */
1686                asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1687                if (!asoc) {
1688                        /* If we could not find a matching association on the
1689                         * endpoint, make sure that it is not a TCP-style
1690                         * socket that already has an association or there is
1691                         * no peeled-off association on another socket.
1692                         */
1693                        if ((sctp_style(sk, TCP) &&
1694                             sctp_sstate(sk, ESTABLISHED)) ||
1695                            sctp_endpoint_is_peeled_off(ep, &to)) {
1696                                err = -EADDRNOTAVAIL;
1697                                goto out_unlock;
1698                        }
1699                }
1700        } else {
1701                asoc = sctp_id2assoc(sk, associd);
1702                if (!asoc) {
1703                        err = -EPIPE;
1704                        goto out_unlock;
1705                }
1706        }
1707
1708        if (asoc) {
1709                SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1710
1711                /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1712                 * socket that has an association in CLOSED state. This can
1713                 * happen when an accepted socket has an association that is
1714                 * already CLOSED.
1715                 */
1716                if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1717                        err = -EPIPE;
1718                        goto out_unlock;
1719                }
1720
1721                if (sinfo_flags & SCTP_EOF) {
1722                        SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1723                                          asoc);
1724                        sctp_primitive_SHUTDOWN(net, asoc, NULL);
1725                        err = 0;
1726                        goto out_unlock;
1727                }
1728                if (sinfo_flags & SCTP_ABORT) {
1729
1730                        chunk = sctp_make_abort_user(asoc, msg, msg_len);
1731                        if (!chunk) {
1732                                err = -ENOMEM;
1733                                goto out_unlock;
1734                        }
1735
1736                        SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1737                        sctp_primitive_ABORT(net, asoc, chunk);
1738                        err = 0;
1739                        goto out_unlock;
1740                }
1741        }
1742
1743        /* Do we need to create the association?  */
1744        if (!asoc) {
1745                SCTP_DEBUG_PRINTK("There is no association yet.\n");
1746
1747                if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1748                        err = -EINVAL;
1749                        goto out_unlock;
1750                }
1751
1752                /* Check for invalid stream against the stream counts,
1753                 * either the default or the user specified stream counts.
1754                 */
1755                if (sinfo) {
1756                        if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1757                                /* Check against the defaults. */
1758                                if (sinfo->sinfo_stream >=
1759                                    sp->initmsg.sinit_num_ostreams) {
1760                                        err = -EINVAL;
1761                                        goto out_unlock;
1762                                }
1763                        } else {
1764                                /* Check against the requested.  */
1765                                if (sinfo->sinfo_stream >=
1766                                    sinit->sinit_num_ostreams) {
1767                                        err = -EINVAL;
1768                                        goto out_unlock;
1769                                }
1770                        }
1771                }
1772
1773                /*
1774                 * API 3.1.2 bind() - UDP Style Syntax
1775                 * If a bind() or sctp_bindx() is not called prior to a
1776                 * sendmsg() call that initiates a new association, the
1777                 * system picks an ephemeral port and will choose an address
1778                 * set equivalent to binding with a wildcard address.
1779                 */
1780                if (!ep->base.bind_addr.port) {
1781                        if (sctp_autobind(sk)) {
1782                                err = -EAGAIN;
1783                                goto out_unlock;
1784                        }
1785                } else {
1786                        /*
1787                         * If an unprivileged user inherits a one-to-many
1788                         * style socket with open associations on a privileged
1789                         * port, it MAY be permitted to accept new associations,
1790                         * but it SHOULD NOT be permitted to open new
1791                         * associations.
1792                         */
1793                        if (ep->base.bind_addr.port < PROT_SOCK &&
1794                            !capable(CAP_NET_BIND_SERVICE)) {
1795                                err = -EACCES;
1796                                goto out_unlock;
1797                        }
1798                }
1799
1800                scope = sctp_scope(&to);
1801                new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1802                if (!new_asoc) {
1803                        err = -ENOMEM;
1804                        goto out_unlock;
1805                }
1806                asoc = new_asoc;
1807                err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1808                if (err < 0) {
1809                        err = -ENOMEM;
1810                        goto out_free;
1811                }
1812
1813                /* If the SCTP_INIT ancillary data is specified, set all
1814                 * the association init values accordingly.
1815                 */
1816                if (sinit) {
1817                        if (sinit->sinit_num_ostreams) {
1818                                asoc->c.sinit_num_ostreams =
1819                                        sinit->sinit_num_ostreams;
1820                        }
1821                        if (sinit->sinit_max_instreams) {
1822                                asoc->c.sinit_max_instreams =
1823                                        sinit->sinit_max_instreams;
1824                        }
1825                        if (sinit->sinit_max_attempts) {
1826                                asoc->max_init_attempts
1827                                        = sinit->sinit_max_attempts;
1828                        }
1829                        if (sinit->sinit_max_init_timeo) {
1830                                asoc->max_init_timeo =
1831                                 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1832                        }
1833                }
1834
1835                /* Prime the peer's transport structures.  */
1836                transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1837                if (!transport) {
1838                        err = -ENOMEM;
1839                        goto out_free;
1840                }
1841        }
1842
1843        /* ASSERT: we have a valid association at this point.  */
1844        SCTP_DEBUG_PRINTK("We have a valid association.\n");
1845
1846        if (!sinfo) {
1847                /* If the user didn't specify SNDRCVINFO, make up one with
1848                 * some defaults.
1849                 */
1850                memset(&default_sinfo, 0, sizeof(default_sinfo));
1851                default_sinfo.sinfo_stream = asoc->default_stream;
1852                default_sinfo.sinfo_flags = asoc->default_flags;
1853                default_sinfo.sinfo_ppid = asoc->default_ppid;
1854                default_sinfo.sinfo_context = asoc->default_context;
1855                default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1856                default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1857                sinfo = &default_sinfo;
1858        }
1859
1860        /* API 7.1.7, the sndbuf size per association bounds the
1861         * maximum size of data that can be sent in a single send call.
1862         */
1863        if (msg_len > sk->sk_sndbuf) {
1864                err = -EMSGSIZE;
1865                goto out_free;
1866        }
1867
1868        if (asoc->pmtu_pending)
1869                sctp_assoc_pending_pmtu(sk, asoc);
1870
1871        /* If fragmentation is disabled and the message length exceeds the
1872         * association fragmentation point, return EMSGSIZE.  The I-D
1873         * does not specify what this error is, but this looks like
1874         * a great fit.
1875         */
1876        if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1877                err = -EMSGSIZE;
1878                goto out_free;
1879        }
1880
1881        /* Check for invalid stream. */
1882        if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1883                err = -EINVAL;
1884                goto out_free;
1885        }
1886
1887        timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1888        if (!sctp_wspace(asoc)) {
1889                err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1890                if (err)
1891                        goto out_free;
1892        }
1893
1894        /* If an address is passed with the sendto/sendmsg call, it is used
1895         * to override the primary destination address in the TCP model, or
1896         * when SCTP_ADDR_OVER flag is set in the UDP model.
1897         */
1898        if ((sctp_style(sk, TCP) && msg_name) ||
1899            (sinfo_flags & SCTP_ADDR_OVER)) {
1900                chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1901                if (!chunk_tp) {
1902                        err = -EINVAL;
1903                        goto out_free;
1904                }
1905        } else
1906                chunk_tp = NULL;
1907
1908        /* Auto-connect, if we aren't connected already. */
1909        if (sctp_state(asoc, CLOSED)) {
1910                err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1911                if (err < 0)
1912                        goto out_free;
1913                SCTP_DEBUG_PRINTK("We associated primitively.\n");
1914        }
1915
1916        /* Break the message into multiple chunks of maximum size. */
1917        datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1918        if (IS_ERR(datamsg)) {
1919                err = PTR_ERR(datamsg);
1920                goto out_free;
1921        }
1922
1923        /* Now send the (possibly) fragmented message. */
1924        list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1925                sctp_chunk_hold(chunk);
1926
1927                /* Do accounting for the write space.  */
1928                sctp_set_owner_w(chunk);
1929
1930                chunk->transport = chunk_tp;
1931        }
1932
1933        /* Send it to the lower layers.  Note:  all chunks
1934         * must either fail or succeed.   The lower layer
1935         * works that way today.  Keep it that way or this
1936         * breaks.
1937         */
1938        err = sctp_primitive_SEND(net, asoc, datamsg);
1939        /* Did the lower layer accept the chunk? */
1940        if (err)
1941                sctp_datamsg_free(datamsg);
1942        else
1943                sctp_datamsg_put(datamsg);
1944
1945        SCTP_DEBUG_PRINTK("We sent primitively.\n");
1946
1947        if (err)
1948                goto out_free;
1949        else
1950                err = msg_len;
1951
1952        /* If we are already past ASSOCIATE, the lower
1953         * layers are responsible for association cleanup.
1954         */
1955        goto out_unlock;
1956
1957out_free:
1958        if (new_asoc) {
1959                sctp_unhash_established(asoc);
1960                sctp_association_free(asoc);
1961        }
1962out_unlock:
1963        sctp_release_sock(sk);
1964
1965out_nounlock:
1966        return sctp_error(sk, msg_flags, err);
1967
1968#if 0
1969do_sock_err:
1970        if (msg_len)
1971                err = msg_len;
1972        else
1973                err = sock_error(sk);
1974        goto out;
1975
1976do_interrupted:
1977        if (msg_len)
1978                err = msg_len;
1979        goto out;
1980#endif /* 0 */
1981}
1982
1983/* This is an extended version of skb_pull() that removes the data from the
1984 * start of a skb even when data is spread across the list of skb's in the
1985 * frag_list. len specifies the total amount of data that needs to be removed.
1986 * when 'len' bytes could be removed from the skb, it returns 0.
1987 * If 'len' exceeds the total skb length,  it returns the no. of bytes that
1988 * could not be removed.
1989 */
1990static int sctp_skb_pull(struct sk_buff *skb, int len)
1991{
1992        struct sk_buff *list;
1993        int skb_len = skb_headlen(skb);
1994        int rlen;
1995
1996        if (len <= skb_len) {
1997                __skb_pull(skb, len);
1998                return 0;
1999        }
2000        len -= skb_len;
2001        __skb_pull(skb, skb_len);
2002
2003        skb_walk_frags(skb, list) {
2004                rlen = sctp_skb_pull(list, len);
2005                skb->len -= (len-rlen);
2006                skb->data_len -= (len-rlen);
2007
2008                if (!rlen)
2009                        return 0;
2010
2011                len = rlen;
2012        }
2013
2014        return len;
2015}
2016
2017/* API 3.1.3  recvmsg() - UDP Style Syntax
2018 *
2019 *  ssize_t recvmsg(int socket, struct msghdr *message,
2020 *                    int flags);
2021 *
2022 *  socket  - the socket descriptor of the endpoint.
2023 *  message - pointer to the msghdr structure which contains a single
2024 *            user message and possibly some ancillary data.
2025 *
2026 *            See Section 5 for complete description of the data
2027 *            structures.
2028 *
2029 *  flags   - flags sent or received with the user message, see Section
2030 *            5 for complete description of the flags.
2031 */
2032static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
2033
2034SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2035                             struct msghdr *msg, size_t len, int noblock,
2036                             int flags, int *addr_len)
2037{
2038        struct sctp_ulpevent *event = NULL;
2039        struct sctp_sock *sp = sctp_sk(sk);
2040        struct sk_buff *skb;
2041        int copied;
2042        int err = 0;
2043        int skb_len;
2044
2045        SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
2046                          "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
2047                          "len", len, "knoblauch", noblock,
2048                          "flags", flags, "addr_len", addr_len);
2049
2050        sctp_lock_sock(sk);
2051
2052        if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2053                err = -ENOTCONN;
2054                goto out;
2055        }
2056
2057        skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2058        if (!skb)
2059                goto out;
2060
2061        /* Get the total length of the skb including any skb's in the
2062         * frag_list.
2063         */
2064        skb_len = skb->len;
2065
2066        copied = skb_len;
2067        if (copied > len)
2068                copied = len;
2069
2070        err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2071
2072        event = sctp_skb2event(skb);
2073
2074        if (err)
2075                goto out_free;
2076
2077        sock_recv_ts_and_drops(msg, sk, skb);
2078        if (sctp_ulpevent_is_notification(event)) {
2079                msg->msg_flags |= MSG_NOTIFICATION;
2080                sp->pf->event_msgname(event, msg->msg_name, addr_len);
2081        } else {
2082                sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2083        }
2084
2085        /* Check if we allow SCTP_SNDRCVINFO. */
2086        if (sp->subscribe.sctp_data_io_event)
2087                sctp_ulpevent_read_sndrcvinfo(event, msg);
2088#if 0
2089        /* FIXME: we should be calling IP/IPv6 layers.  */
2090        if (sk->sk_protinfo.af_inet.cmsg_flags)
2091                ip_cmsg_recv(msg, skb);
2092#endif
2093
2094        err = copied;
2095
2096        /* If skb's length exceeds the user's buffer, update the skb and
2097         * push it back to the receive_queue so that the next call to
2098         * recvmsg() will return the remaining data. Don't set MSG_EOR.
2099         */
2100        if (skb_len > copied) {
2101                msg->msg_flags &= ~MSG_EOR;
2102                if (flags & MSG_PEEK)
2103                        goto out_free;
2104                sctp_skb_pull(skb, copied);
2105                skb_queue_head(&sk->sk_receive_queue, skb);
2106
2107                /* When only partial message is copied to the user, increase
2108                 * rwnd by that amount. If all the data in the skb is read,
2109                 * rwnd is updated when the event is freed.
2110                 */
2111                if (!sctp_ulpevent_is_notification(event))
2112                        sctp_assoc_rwnd_increase(event->asoc, copied);
2113                goto out;
2114        } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2115                   (event->msg_flags & MSG_EOR))
2116                msg->msg_flags |= MSG_EOR;
2117        else
2118                msg->msg_flags &= ~MSG_EOR;
2119
2120out_free:
2121        if (flags & MSG_PEEK) {
2122                /* Release the skb reference acquired after peeking the skb in
2123                 * sctp_skb_recv_datagram().
2124                 */
2125                kfree_skb(skb);
2126        } else {
2127                /* Free the event which includes releasing the reference to
2128                 * the owner of the skb, freeing the skb and updating the
2129                 * rwnd.
2130                 */
2131                sctp_ulpevent_free(event);
2132        }
2133out:
2134        sctp_release_sock(sk);
2135        return err;
2136}
2137
2138/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2139 *
2140 * This option is a on/off flag.  If enabled no SCTP message
2141 * fragmentation will be performed.  Instead if a message being sent
2142 * exceeds the current PMTU size, the message will NOT be sent and
2143 * instead a error will be indicated to the user.
2144 */
2145static int sctp_setsockopt_disable_fragments(struct sock *sk,
2146                                             char __user *optval,
2147                                             unsigned int optlen)
2148{
2149        int val;
2150
2151        if (optlen < sizeof(int))
2152                return -EINVAL;
2153
2154        if (get_user(val, (int __user *)optval))
2155                return -EFAULT;
2156
2157        sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2158
2159        return 0;
2160}
2161
2162static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2163                                  unsigned int optlen)
2164{
2165        struct sctp_association *asoc;
2166        struct sctp_ulpevent *event;
2167
2168        if (optlen > sizeof(struct sctp_event_subscribe))
2169                return -EINVAL;
2170        if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2171                return -EFAULT;
2172
2173        /*
2174         * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2175         * if there is no data to be sent or retransmit, the stack will
2176         * immediately send up this notification.
2177         */
2178        if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2179                                       &sctp_sk(sk)->subscribe)) {
2180                asoc = sctp_id2assoc(sk, 0);
2181
2182                if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2183                        event = sctp_ulpevent_make_sender_dry_event(asoc,
2184                                        GFP_ATOMIC);
2185                        if (!event)
2186                                return -ENOMEM;
2187
2188                        sctp_ulpq_tail_event(&asoc->ulpq, event);
2189                }
2190        }
2191
2192        return 0;
2193}
2194
2195/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2196 *
2197 * This socket option is applicable to the UDP-style socket only.  When
2198 * set it will cause associations that are idle for more than the
2199 * specified number of seconds to automatically close.  An association
2200 * being idle is defined an association that has NOT sent or received
2201 * user data.  The special value of '0' indicates that no automatic
2202 * close of any associations should be performed.  The option expects an
2203 * integer defining the number of seconds of idle time before an
2204 * association is closed.
2205 */
2206static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2207                                     unsigned int optlen)
2208{
2209        struct sctp_sock *sp = sctp_sk(sk);
2210
2211        /* Applicable to UDP-style socket only */
2212        if (sctp_style(sk, TCP))
2213                return -EOPNOTSUPP;
2214        if (optlen != sizeof(int))
2215                return -EINVAL;
2216        if (copy_from_user(&sp->autoclose, optval, optlen))
2217                return -EFAULT;
2218
2219        return 0;
2220}
2221
2222/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2223 *
2224 * Applications can enable or disable heartbeats for any peer address of
2225 * an association, modify an address's heartbeat interval, force a
2226 * heartbeat to be sent immediately, and adjust the address's maximum
2227 * number of retransmissions sent before an address is considered
2228 * unreachable.  The following structure is used to access and modify an
2229 * address's parameters:
2230 *
2231 *  struct sctp_paddrparams {
2232 *     sctp_assoc_t            spp_assoc_id;
2233 *     struct sockaddr_storage spp_address;
2234 *     uint32_t                spp_hbinterval;
2235 *     uint16_t                spp_pathmaxrxt;
2236 *     uint32_t                spp_pathmtu;
2237 *     uint32_t                spp_sackdelay;
2238 *     uint32_t                spp_flags;
2239 * };
2240 *
2241 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2242 *                     application, and identifies the association for
2243 *                     this query.
2244 *   spp_address     - This specifies which address is of interest.
2245 *   spp_hbinterval  - This contains the value of the heartbeat interval,
2246 *                     in milliseconds.  If a  value of zero
2247 *                     is present in this field then no changes are to
2248 *                     be made to this parameter.
2249 *   spp_pathmaxrxt  - This contains the maximum number of
2250 *                     retransmissions before this address shall be
2251 *                     considered unreachable. If a  value of zero
2252 *                     is present in this field then no changes are to
2253 *                     be made to this parameter.
2254 *   spp_pathmtu     - When Path MTU discovery is disabled the value
2255 *                     specified here will be the "fixed" path mtu.
2256 *                     Note that if the spp_address field is empty
2257 *                     then all associations on this address will
2258 *                     have this fixed path mtu set upon them.
2259 *
2260 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2261 *                     the number of milliseconds that sacks will be delayed
2262 *                     for. This value will apply to all addresses of an
2263 *                     association if the spp_address field is empty. Note
2264 *                     also, that if delayed sack is enabled and this
2265 *                     value is set to 0, no change is made to the last
2266 *                     recorded delayed sack timer value.
2267 *
2268 *   spp_flags       - These flags are used to control various features
2269 *                     on an association. The flag field may contain
2270 *                     zero or more of the following options.
2271 *
2272 *                     SPP_HB_ENABLE  - Enable heartbeats on the
2273 *                     specified address. Note that if the address
2274 *                     field is empty all addresses for the association
2275 *                     have heartbeats enabled upon them.
2276 *
2277 *                     SPP_HB_DISABLE - Disable heartbeats on the
2278 *                     speicifed address. Note that if the address
2279 *                     field is empty all addresses for the association
2280 *                     will have their heartbeats disabled. Note also
2281 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2282 *                     mutually exclusive, only one of these two should
2283 *                     be specified. Enabling both fields will have
2284 *                     undetermined results.
2285 *
2286 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2287 *                     to be made immediately.
2288 *
2289 *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2290 *                     heartbeat delayis to be set to the value of 0
2291 *                     milliseconds.
2292 *
2293 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2294 *                     discovery upon the specified address. Note that
2295 *                     if the address feild is empty then all addresses
2296 *                     on the association are effected.
2297 *
2298 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2299 *                     discovery upon the specified address. Note that
2300 *                     if the address feild is empty then all addresses
2301 *                     on the association are effected. Not also that
2302 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2303 *                     exclusive. Enabling both will have undetermined
2304 *                     results.
2305 *
2306 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2307 *                     on delayed sack. The time specified in spp_sackdelay
2308 *                     is used to specify the sack delay for this address. Note
2309 *                     that if spp_address is empty then all addresses will
2310 *                     enable delayed sack and take on the sack delay
2311 *                     value specified in spp_sackdelay.
2312 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2313 *                     off delayed sack. If the spp_address field is blank then
2314 *                     delayed sack is disabled for the entire association. Note
2315 *                     also that this field is mutually exclusive to
2316 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2317 *                     results.
2318 */
2319static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2320                                       struct sctp_transport   *trans,
2321                                       struct sctp_association *asoc,
2322                                       struct sctp_sock        *sp,
2323                                       int                      hb_change,
2324                                       int                      pmtud_change,
2325                                       int                      sackdelay_change)
2326{
2327        int error;
2328
2329        if (params->spp_flags & SPP_HB_DEMAND && trans) {
2330                struct net *net = sock_net(trans->asoc->base.sk);
2331
2332                error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2333                if (error)
2334                        return error;
2335        }
2336
2337        /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2338         * this field is ignored.  Note also that a value of zero indicates
2339         * the current setting should be left unchanged.
2340         */
2341        if (params->spp_flags & SPP_HB_ENABLE) {
2342
2343                /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2344                 * set.  This lets us use 0 value when this flag
2345                 * is set.
2346                 */
2347                if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2348                        params->spp_hbinterval = 0;
2349
2350                if (params->spp_hbinterval ||
2351                    (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2352                        if (trans) {
2353                                trans->hbinterval =
2354                                    msecs_to_jiffies(params->spp_hbinterval);
2355                        } else if (asoc) {
2356                                asoc->hbinterval =
2357                                    msecs_to_jiffies(params->spp_hbinterval);
2358                        } else {
2359                                sp->hbinterval = params->spp_hbinterval;
2360                        }
2361                }
2362        }
2363
2364        if (hb_change) {
2365                if (trans) {
2366                        trans->param_flags =
2367                                (trans->param_flags & ~SPP_HB) | hb_change;
2368                } else if (asoc) {
2369                        asoc->param_flags =
2370                                (asoc->param_flags & ~SPP_HB) | hb_change;
2371                } else {
2372                        sp->param_flags =
2373                                (sp->param_flags & ~SPP_HB) | hb_change;
2374                }
2375        }
2376
2377        /* When Path MTU discovery is disabled the value specified here will
2378         * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2379         * include the flag SPP_PMTUD_DISABLE for this field to have any
2380         * effect).
2381         */
2382        if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2383                if (trans) {
2384                        trans->pathmtu = params->spp_pathmtu;
2385                        sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2386                } else if (asoc) {
2387                        asoc->pathmtu = params->spp_pathmtu;
2388                        sctp_frag_point(asoc, params->spp_pathmtu);
2389                } else {
2390                        sp->pathmtu = params->spp_pathmtu;
2391                }
2392        }
2393
2394        if (pmtud_change) {
2395                if (trans) {
2396                        int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2397                                (params->spp_flags & SPP_PMTUD_ENABLE);
2398                        trans->param_flags =
2399                                (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2400                        if (update) {
2401                                sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2402                                sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2403                        }
2404                } else if (asoc) {
2405                        asoc->param_flags =
2406                                (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2407                } else {
2408                        sp->param_flags =
2409                                (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2410                }
2411        }
2412
2413        /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2414         * value of this field is ignored.  Note also that a value of zero
2415         * indicates the current setting should be left unchanged.
2416         */
2417        if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2418                if (trans) {
2419                        trans->sackdelay =
2420                                msecs_to_jiffies(params->spp_sackdelay);
2421                } else if (asoc) {
2422                        asoc->sackdelay =
2423                                msecs_to_jiffies(params->spp_sackdelay);
2424                } else {
2425                        sp->sackdelay = params->spp_sackdelay;
2426                }
2427        }
2428
2429        if (sackdelay_change) {
2430                if (trans) {
2431                        trans->param_flags =
2432                                (trans->param_flags & ~SPP_SACKDELAY) |
2433                                sackdelay_change;
2434                } else if (asoc) {
2435                        asoc->param_flags =
2436                                (asoc->param_flags & ~SPP_SACKDELAY) |
2437                                sackdelay_change;
2438                } else {
2439                        sp->param_flags =
2440                                (sp->param_flags & ~SPP_SACKDELAY) |
2441                                sackdelay_change;
2442                }
2443        }
2444
2445        /* Note that a value of zero indicates the current setting should be
2446           left unchanged.
2447         */
2448        if (params->spp_pathmaxrxt) {
2449                if (trans) {
2450                        trans->pathmaxrxt = params->spp_pathmaxrxt;
2451                } else if (asoc) {
2452                        asoc->pathmaxrxt = params->spp_pathmaxrxt;
2453                } else {
2454                        sp->pathmaxrxt = params->spp_pathmaxrxt;
2455                }
2456        }
2457
2458        return 0;
2459}
2460
2461static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2462                                            char __user *optval,
2463                                            unsigned int optlen)
2464{
2465        struct sctp_paddrparams  params;
2466        struct sctp_transport   *trans = NULL;
2467        struct sctp_association *asoc = NULL;
2468        struct sctp_sock        *sp = sctp_sk(sk);
2469        int error;
2470        int hb_change, pmtud_change, sackdelay_change;
2471
2472        if (optlen != sizeof(struct sctp_paddrparams))
2473                return - EINVAL;
2474
2475        if (copy_from_user(&params, optval, optlen))
2476                return -EFAULT;
2477
2478        /* Validate flags and value parameters. */
2479        hb_change        = params.spp_flags & SPP_HB;
2480        pmtud_change     = params.spp_flags & SPP_PMTUD;
2481        sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2482
2483        if (hb_change        == SPP_HB ||
2484            pmtud_change     == SPP_PMTUD ||
2485            sackdelay_change == SPP_SACKDELAY ||
2486            params.spp_sackdelay > 500 ||
2487            (params.spp_pathmtu &&
2488             params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2489                return -EINVAL;
2490
2491        /* If an address other than INADDR_ANY is specified, and
2492         * no transport is found, then the request is invalid.
2493         */
2494        if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
2495                trans = sctp_addr_id2transport(sk, &params.spp_address,
2496                                               params.spp_assoc_id);
2497                if (!trans)
2498                        return -EINVAL;
2499        }
2500
2501        /* Get association, if assoc_id != 0 and the socket is a one
2502         * to many style socket, and an association was not found, then
2503         * the id was invalid.
2504         */
2505        asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2506        if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2507                return -EINVAL;
2508
2509        /* Heartbeat demand can only be sent on a transport or
2510         * association, but not a socket.
2511         */
2512        if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2513                return -EINVAL;
2514
2515        /* Process parameters. */
2516        error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2517                                            hb_change, pmtud_change,
2518                                            sackdelay_change);
2519
2520        if (error)
2521                return error;
2522
2523        /* If changes are for association, also apply parameters to each
2524         * transport.
2525         */
2526        if (!trans && asoc) {
2527                list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2528                                transports) {
2529                        sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2530                                                    hb_change, pmtud_change,
2531                                                    sackdelay_change);
2532                }
2533        }
2534
2535        return 0;
2536}
2537
2538/*
2539 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2540 *
2541 * This option will effect the way delayed acks are performed.  This
2542 * option allows you to get or set the delayed ack time, in
2543 * milliseconds.  It also allows changing the delayed ack frequency.
2544 * Changing the frequency to 1 disables the delayed sack algorithm.  If
2545 * the assoc_id is 0, then this sets or gets the endpoints default
2546 * values.  If the assoc_id field is non-zero, then the set or get
2547 * effects the specified association for the one to many model (the
2548 * assoc_id field is ignored by the one to one model).  Note that if
2549 * sack_delay or sack_freq are 0 when setting this option, then the
2550 * current values will remain unchanged.
2551 *
2552 * struct sctp_sack_info {
2553 *     sctp_assoc_t            sack_assoc_id;
2554 *     uint32_t                sack_delay;
2555 *     uint32_t                sack_freq;
2556 * };
2557 *
2558 * sack_assoc_id -  This parameter, indicates which association the user
2559 *    is performing an action upon.  Note that if this field's value is
2560 *    zero then the endpoints default value is changed (effecting future
2561 *    associations only).
2562 *
2563 * sack_delay -  This parameter contains the number of milliseconds that
2564 *    the user is requesting the delayed ACK timer be set to.  Note that
2565 *    this value is defined in the standard to be between 200 and 500
2566 *    milliseconds.
2567 *
2568 * sack_freq -  This parameter contains the number of packets that must
2569 *    be received before a sack is sent without waiting for the delay
2570 *    timer to expire.  The default value for this is 2, setting this
2571 *    value to 1 will disable the delayed sack algorithm.
2572 */
2573
2574static int sctp_setsockopt_delayed_ack(struct sock *sk,
2575                                       char __user *optval, unsigned int optlen)
2576{
2577        struct sctp_sack_info    params;
2578        struct sctp_transport   *trans = NULL;
2579        struct sctp_association *asoc = NULL;
2580        struct sctp_sock        *sp = sctp_sk(sk);
2581
2582        if (optlen == sizeof(struct sctp_sack_info)) {
2583                if (copy_from_user(&params, optval, optlen))
2584                        return -EFAULT;
2585
2586                if (params.sack_delay == 0 && params.sack_freq == 0)
2587                        return 0;
2588        } else if (optlen == sizeof(struct sctp_assoc_value)) {
2589                pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2590                pr_warn("Use struct sctp_sack_info instead\n");
2591                if (copy_from_user(&params, optval, optlen))
2592                        return -EFAULT;
2593
2594                if (params.sack_delay == 0)
2595                        params.sack_freq = 1;
2596                else
2597                        params.sack_freq = 0;
2598        } else
2599                return - EINVAL;
2600
2601        /* Validate value parameter. */
2602        if (params.sack_delay > 500)
2603                return -EINVAL;
2604
2605        /* Get association, if sack_assoc_id != 0 and the socket is a one
2606         * to many style socket, and an association was not found, then
2607         * the id was invalid.
2608         */
2609        asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2610        if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2611                return -EINVAL;
2612
2613        if (params.sack_delay) {
2614                if (asoc) {
2615                        asoc->sackdelay =
2616                                msecs_to_jiffies(params.sack_delay);
2617                        asoc->param_flags =
2618                                (asoc->param_flags & ~SPP_SACKDELAY) |
2619                                SPP_SACKDELAY_ENABLE;
2620                } else {
2621                        sp->sackdelay = params.sack_delay;
2622                        sp->param_flags =
2623                                (sp->param_flags & ~SPP_SACKDELAY) |
2624                                SPP_SACKDELAY_ENABLE;
2625                }
2626        }
2627
2628        if (params.sack_freq == 1) {
2629                if (asoc) {
2630                        asoc->param_flags =
2631                                (asoc->param_flags & ~SPP_SACKDELAY) |
2632                                SPP_SACKDELAY_DISABLE;
2633                } else {
2634                        sp->param_flags =
2635                                (sp->param_flags & ~SPP_SACKDELAY) |
2636                                SPP_SACKDELAY_DISABLE;
2637                }
2638        } else if (params.sack_freq > 1) {
2639                if (asoc) {
2640                        asoc->sackfreq = params.sack_freq;
2641                        asoc->param_flags =
2642                                (asoc->param_flags & ~SPP_SACKDELAY) |
2643                                SPP_SACKDELAY_ENABLE;
2644                } else {
2645                        sp->sackfreq = params.sack_freq;
2646                        sp->param_flags =
2647                                (sp->param_flags & ~SPP_SACKDELAY) |
2648                                SPP_SACKDELAY_ENABLE;
2649                }
2650        }
2651
2652        /* If change is for association, also apply to each transport. */
2653        if (asoc) {
2654                list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2655                                transports) {
2656                        if (params.sack_delay) {
2657                                trans->sackdelay =
2658                                        msecs_to_jiffies(params.sack_delay);
2659                                trans->param_flags =
2660                                        (trans->param_flags & ~SPP_SACKDELAY) |
2661                                        SPP_SACKDELAY_ENABLE;
2662                        }
2663                        if (params.sack_freq == 1) {
2664                                trans->param_flags =
2665                                        (trans->param_flags & ~SPP_SACKDELAY) |
2666                                        SPP_SACKDELAY_DISABLE;
2667                        } else if (params.sack_freq > 1) {
2668                                trans->sackfreq = params.sack_freq;
2669                                trans->param_flags =
2670                                        (trans->param_flags & ~SPP_SACKDELAY) |
2671                                        SPP_SACKDELAY_ENABLE;
2672                        }
2673                }
2674        }
2675
2676        return 0;
2677}
2678
2679/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2680 *
2681 * Applications can specify protocol parameters for the default association
2682 * initialization.  The option name argument to setsockopt() and getsockopt()
2683 * is SCTP_INITMSG.
2684 *
2685 * Setting initialization parameters is effective only on an unconnected
2686 * socket (for UDP-style sockets only future associations are effected
2687 * by the change).  With TCP-style sockets, this option is inherited by
2688 * sockets derived from a listener socket.
2689 */
2690static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2691{
2692        struct sctp_initmsg sinit;
2693        struct sctp_sock *sp = sctp_sk(sk);
2694
2695        if (optlen != sizeof(struct sctp_initmsg))
2696                return -EINVAL;
2697        if (copy_from_user(&sinit, optval, optlen))
2698                return -EFAULT;
2699
2700        if (sinit.sinit_num_ostreams)
2701                sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2702        if (sinit.sinit_max_instreams)
2703                sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2704        if (sinit.sinit_max_attempts)
2705                sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2706        if (sinit.sinit_max_init_timeo)
2707                sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2708
2709        return 0;
2710}
2711
2712/*
2713 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2714 *
2715 *   Applications that wish to use the sendto() system call may wish to
2716 *   specify a default set of parameters that would normally be supplied
2717 *   through the inclusion of ancillary data.  This socket option allows
2718 *   such an application to set the default sctp_sndrcvinfo structure.
2719 *   The application that wishes to use this socket option simply passes
2720 *   in to this call the sctp_sndrcvinfo structure defined in Section
2721 *   5.2.2) The input parameters accepted by this call include
2722 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2723 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2724 *   to this call if the caller is using the UDP model.
2725 */
2726static int sctp_setsockopt_default_send_param(struct sock *sk,
2727                                              char __user *optval,
2728                                              unsigned int optlen)
2729{
2730        struct sctp_sndrcvinfo info;
2731        struct sctp_association *asoc;
2732        struct sctp_sock *sp = sctp_sk(sk);
2733
2734        if (optlen != sizeof(struct sctp_sndrcvinfo))
2735                return -EINVAL;
2736        if (copy_from_user(&info, optval, optlen))
2737                return -EFAULT;
2738
2739        asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2740        if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2741                return -EINVAL;
2742
2743        if (asoc) {
2744                asoc->default_stream = info.sinfo_stream;
2745                asoc->default_flags = info.sinfo_flags;
2746                asoc->default_ppid = info.sinfo_ppid;
2747                asoc->default_context = info.sinfo_context;
2748                asoc->default_timetolive = info.sinfo_timetolive;
2749        } else {
2750                sp->default_stream = info.sinfo_stream;
2751                sp->default_flags = info.sinfo_flags;
2752                sp->default_ppid = info.sinfo_ppid;
2753                sp->default_context = info.sinfo_context;
2754                sp->default_timetolive = info.sinfo_timetolive;
2755        }
2756
2757        return 0;
2758}
2759
2760/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2761 *
2762 * Requests that the local SCTP stack use the enclosed peer address as
2763 * the association primary.  The enclosed address must be one of the
2764 * association peer's addresses.
2765 */
2766static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2767                                        unsigned int optlen)
2768{
2769        struct sctp_prim prim;
2770        struct sctp_transport *trans;
2771
2772        if (optlen != sizeof(struct sctp_prim))
2773                return -EINVAL;
2774
2775        if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2776                return -EFAULT;
2777
2778        trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2779        if (!trans)
2780                return -EINVAL;
2781
2782        sctp_assoc_set_primary(trans->asoc, trans);
2783
2784        return 0;
2785}
2786
2787/*
2788 * 7.1.5 SCTP_NODELAY
2789 *
2790 * Turn on/off any Nagle-like algorithm.  This means that packets are
2791 * generally sent as soon as possible and no unnecessary delays are
2792 * introduced, at the cost of more packets in the network.  Expects an
2793 *  integer boolean flag.
2794 */
2795static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2796                                   unsigned int optlen)
2797{
2798        int val;
2799
2800        if (optlen < sizeof(int))
2801                return -EINVAL;
2802        if (get_user(val, (int __user *)optval))
2803                return -EFAULT;
2804
2805        sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2806        return 0;
2807}
2808
2809/*
2810 *
2811 * 7.1.1 SCTP_RTOINFO
2812 *
2813 * The protocol parameters used to initialize and bound retransmission
2814 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2815 * and modify these parameters.
2816 * All parameters are time values, in milliseconds.  A value of 0, when
2817 * modifying the parameters, indicates that the current value should not
2818 * be changed.
2819 *
2820 */
2821static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2822{
2823        struct sctp_rtoinfo rtoinfo;
2824        struct sctp_association *asoc;
2825
2826        if (optlen != sizeof (struct sctp_rtoinfo))
2827                return -EINVAL;
2828
2829        if (copy_from_user(&rtoinfo, optval, optlen))
2830                return -EFAULT;
2831
2832        asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2833
2834        /* Set the values to the specific association */
2835        if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2836                return -EINVAL;
2837
2838        if (asoc) {
2839                if (rtoinfo.srto_initial != 0)
2840                        asoc->rto_initial =
2841                                msecs_to_jiffies(rtoinfo.srto_initial);
2842                if (rtoinfo.srto_max != 0)
2843                        asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2844                if (rtoinfo.srto_min != 0)
2845                        asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2846        } else {
2847                /* If there is no association or the association-id = 0
2848                 * set the values to the endpoint.
2849                 */
2850                struct sctp_sock *sp = sctp_sk(sk);
2851
2852                if (rtoinfo.srto_initial != 0)
2853                        sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2854                if (rtoinfo.srto_max != 0)
2855                        sp->rtoinfo.srto_max = rtoinfo.srto_max;
2856                if (rtoinfo.srto_min != 0)
2857                        sp->rtoinfo.srto_min = rtoinfo.srto_min;
2858        }
2859
2860        return 0;
2861}
2862
2863/*
2864 *
2865 * 7.1.2 SCTP_ASSOCINFO
2866 *
2867 * This option is used to tune the maximum retransmission attempts
2868 * of the association.
2869 * Returns an error if the new association retransmission value is
2870 * greater than the sum of the retransmission value  of the peer.
2871 * See [SCTP] for more information.
2872 *
2873 */
2874static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2875{
2876
2877        struct sctp_assocparams assocparams;
2878        struct sctp_association *asoc;
2879
2880        if (optlen != sizeof(struct sctp_assocparams))
2881                return -EINVAL;
2882        if (copy_from_user(&assocparams, optval, optlen))
2883                return -EFAULT;
2884
2885        asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2886
2887        if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2888                return -EINVAL;
2889
2890        /* Set the values to the specific association */
2891        if (asoc) {
2892                if (assocparams.sasoc_asocmaxrxt != 0) {
2893                        __u32 path_sum = 0;
2894                        int   paths = 0;
2895                        struct sctp_transport *peer_addr;
2896
2897                        list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2898                                        transports) {
2899                                path_sum += peer_addr->pathmaxrxt;
2900                                paths++;
2901                        }
2902
2903                        /* Only validate asocmaxrxt if we have more than
2904                         * one path/transport.  We do this because path
2905                         * retransmissions are only counted when we have more
2906                         * then one path.
2907                         */
2908                        if (paths > 1 &&
2909                            assocparams.sasoc_asocmaxrxt > path_sum)
2910                                return -EINVAL;
2911
2912                        asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2913                }
2914
2915                if (assocparams.sasoc_cookie_life != 0) {
2916                        asoc->cookie_life.tv_sec =
2917                                        assocparams.sasoc_cookie_life / 1000;
2918                        asoc->cookie_life.tv_usec =
2919                                        (assocparams.sasoc_cookie_life % 1000)
2920                                        * 1000;
2921                }
2922        } else {
2923                /* Set the values to the endpoint */
2924                struct sctp_sock *sp = sctp_sk(sk);
2925
2926                if (assocparams.sasoc_asocmaxrxt != 0)
2927                        sp->assocparams.sasoc_asocmaxrxt =
2928                                                assocparams.sasoc_asocmaxrxt;
2929                if (assocparams.sasoc_cookie_life != 0)
2930                        sp->assocparams.sasoc_cookie_life =
2931                                                assocparams.sasoc_cookie_life;
2932        }
2933        return 0;
2934}
2935
2936/*
2937 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2938 *
2939 * This socket option is a boolean flag which turns on or off mapped V4
2940 * addresses.  If this option is turned on and the socket is type
2941 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2942 * If this option is turned off, then no mapping will be done of V4
2943 * addresses and a user will receive both PF_INET6 and PF_INET type
2944 * addresses on the socket.
2945 */
2946static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
2947{
2948        int val;
2949        struct sctp_sock *sp = sctp_sk(sk);
2950
2951        if (optlen < sizeof(int))
2952                return -EINVAL;
2953        if (get_user(val, (int __user *)optval))
2954                return -EFAULT;
2955        if (val)
2956                sp->v4mapped = 1;
2957        else
2958                sp->v4mapped = 0;
2959
2960        return 0;
2961}
2962
2963/*
2964 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2965 * This option will get or set the maximum size to put in any outgoing
2966 * SCTP DATA chunk.  If a message is larger than this size it will be
2967 * fragmented by SCTP into the specified size.  Note that the underlying
2968 * SCTP implementation may fragment into smaller sized chunks when the
2969 * PMTU of the underlying association is smaller than the value set by
2970 * the user.  The default value for this option is '0' which indicates
2971 * the user is NOT limiting fragmentation and only the PMTU will effect
2972 * SCTP's choice of DATA chunk size.  Note also that values set larger
2973 * than the maximum size of an IP datagram will effectively let SCTP
2974 * control fragmentation (i.e. the same as setting this option to 0).
2975 *
2976 * The following structure is used to access and modify this parameter:
2977 *
2978 * struct sctp_assoc_value {
2979 *   sctp_assoc_t assoc_id;
2980 *   uint32_t assoc_value;
2981 * };
2982 *
2983 * assoc_id:  This parameter is ignored for one-to-one style sockets.
2984 *    For one-to-many style sockets this parameter indicates which
2985 *    association the user is performing an action upon.  Note that if
2986 *    this field's value is zero then the endpoints default value is
2987 *    changed (effecting future associations only).
2988 * assoc_value:  This parameter specifies the maximum size in bytes.
2989 */
2990static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
2991{
2992        struct sctp_assoc_value params;
2993        struct sctp_association *asoc;
2994        struct sctp_sock *sp = sctp_sk(sk);
2995        int val;
2996
2997        if (optlen == sizeof(int)) {
2998                pr_warn("Use of int in maxseg socket option deprecated\n");
2999                pr_warn("Use struct sctp_assoc_value instead\n");
3000                if (copy_from_user(&val, optval, optlen))
3001                        return -EFAULT;
3002                params.assoc_id = 0;
3003        } else if (optlen == sizeof(struct sctp_assoc_value)) {
3004                if (copy_from_user(&params, optval, optlen))
3005                        return -EFAULT;
3006                val = params.assoc_value;
3007        } else
3008                return -EINVAL;
3009
3010        if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3011                return -EINVAL;
3012
3013        asoc = sctp_id2assoc(sk, params.assoc_id);
3014        if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3015                return -EINVAL;
3016
3017        if (asoc) {
3018                if (val == 0) {
3019                        val = asoc->pathmtu;
3020                        val -= sp->pf->af->net_header_len;
3021                        val -= sizeof(struct sctphdr) +
3022                                        sizeof(struct sctp_data_chunk);
3023                }
3024                asoc->user_frag = val;
3025                asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3026        } else {
3027                sp->user_frag = val;
3028        }
3029
3030        return 0;
3031}
3032
3033
3034/*
3035 *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3036 *
3037 *   Requests that the peer mark the enclosed address as the association
3038 *   primary. The enclosed address must be one of the association's
3039 *   locally bound addresses. The following structure is used to make a
3040 *   set primary request:
3041 */
3042static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3043                                             unsigned int optlen)
3044{
3045        struct net *net = sock_net(sk);
3046        struct sctp_sock        *sp;
3047        struct sctp_association *asoc = NULL;
3048        struct sctp_setpeerprim prim;
3049        struct sctp_chunk       *chunk;
3050        struct sctp_af          *af;
3051        int                     err;
3052
3053        sp = sctp_sk(sk);
3054
3055        if (!net->sctp.addip_enable)
3056                return -EPERM;
3057
3058        if (optlen != sizeof(struct sctp_setpeerprim))
3059                return -EINVAL;
3060
3061        if (copy_from_user(&prim, optval, optlen))
3062                return -EFAULT;
3063
3064        asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3065        if (!asoc)
3066                return -EINVAL;
3067
3068        if (!asoc->peer.asconf_capable)
3069                return -EPERM;
3070
3071        if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3072                return -EPERM;
3073
3074        if (!sctp_state(asoc, ESTABLISHED))
3075                return -ENOTCONN;
3076
3077        af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3078        if (!af)
3079                return -EINVAL;
3080
3081        if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3082                return -EADDRNOTAVAIL;
3083
3084        if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3085                return -EADDRNOTAVAIL;
3086
3087        /* Create an ASCONF chunk with SET_PRIMARY parameter    */
3088        chunk = sctp_make_asconf_set_prim(asoc,
3089                                          (union sctp_addr *)&prim.sspp_addr);
3090        if (!chunk)
3091                return -ENOMEM;
3092
3093        err = sctp_send_asconf(asoc, chunk);
3094
3095        SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
3096
3097        return err;
3098}
3099
3100static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3101                                            unsigned int optlen)
3102{
3103        struct sctp_setadaptation adaptation;
3104
3105        if (optlen != sizeof(struct sctp_setadaptation))
3106                return -EINVAL;
3107        if (copy_from_user(&adaptation, optval, optlen))
3108                return -EFAULT;
3109
3110        sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3111
3112        return 0;
3113}
3114
3115/*
3116 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3117 *
3118 * The context field in the sctp_sndrcvinfo structure is normally only
3119 * used when a failed message is retrieved holding the value that was
3120 * sent down on the actual send call.  This option allows the setting of
3121 * a default context on an association basis that will be received on
3122 * reading messages from the peer.  This is especially helpful in the
3123 * one-2-many model for an application to keep some reference to an
3124 * internal state machine that is processing messages on the
3125 * association.  Note that the setting of this value only effects
3126 * received messages from the peer and does not effect the value that is
3127 * saved with outbound messages.
3128 */
3129static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3130                                   unsigned int optlen)
3131{
3132        struct sctp_assoc_value params;
3133        struct sctp_sock *sp;
3134        struct sctp_association *asoc;
3135
3136        if (optlen != sizeof(struct sctp_assoc_value))
3137                return -EINVAL;
3138        if (copy_from_user(&params, optval, optlen))
3139                return -EFAULT;
3140
3141        sp = sctp_sk(sk);
3142
3143        if (params.assoc_id != 0) {
3144                asoc = sctp_id2assoc(sk, params.assoc_id);
3145                if (!asoc)
3146                        return -EINVAL;
3147                asoc->default_rcv_context = params.assoc_value;
3148        } else {
3149                sp->default_rcv_context = params.assoc_value;
3150        }
3151
3152        return 0;
3153}
3154
3155/*
3156 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3157 *
3158 * This options will at a minimum specify if the implementation is doing
3159 * fragmented interleave.  Fragmented interleave, for a one to many
3160 * socket, is when subsequent calls to receive a message may return
3161 * parts of messages from different associations.  Some implementations
3162 * may allow you to turn this value on or off.  If so, when turned off,
3163 * no fragment interleave will occur (which will cause a head of line
3164 * blocking amongst multiple associations sharing the same one to many
3165 * socket).  When this option is turned on, then each receive call may
3166 * come from a different association (thus the user must receive data
3167 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3168 * association each receive belongs to.
3169 *
3170 * This option takes a boolean value.  A non-zero value indicates that
3171 * fragmented interleave is on.  A value of zero indicates that
3172 * fragmented interleave is off.
3173 *
3174 * Note that it is important that an implementation that allows this
3175 * option to be turned on, have it off by default.  Otherwise an unaware
3176 * application using the one to many model may become confused and act
3177 * incorrectly.
3178 */
3179static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3180                                               char __user *optval,
3181                                               unsigned int optlen)
3182{
3183        int val;
3184
3185        if (optlen != sizeof(int))
3186                return -EINVAL;
3187        if (get_user(val, (int __user *)optval))
3188                return -EFAULT;
3189
3190        sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3191
3192        return 0;
3193}
3194
3195/*
3196 * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3197 *       (SCTP_PARTIAL_DELIVERY_POINT)
3198 *
3199 * This option will set or get the SCTP partial delivery point.  This
3200 * point is the size of a message where the partial delivery API will be
3201 * invoked to help free up rwnd space for the peer.  Setting this to a
3202 * lower value will cause partial deliveries to happen more often.  The
3203 * calls argument is an integer that sets or gets the partial delivery
3204 * point.  Note also that the call will fail if the user attempts to set
3205 * this value larger than the socket receive buffer size.
3206 *
3207 * Note that any single message having a length smaller than or equal to
3208 * the SCTP partial delivery point will be delivered in one single read
3209 * call as long as the user provided buffer is large enough to hold the
3210 * message.
3211 */
3212static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3213                                                  char __user *optval,
3214                                                  unsigned int optlen)
3215{
3216        u32 val;
3217
3218        if (optlen != sizeof(u32))
3219                return -EINVAL;
3220        if (get_user(val, (int __user *)optval))
3221                return -EFAULT;
3222
3223        /* Note: We double the receive buffer from what the user sets
3224         * it to be, also initial rwnd is based on rcvbuf/2.
3225         */
3226        if (val > (sk->sk_rcvbuf >> 1))
3227                return -EINVAL;
3228
3229        sctp_sk(sk)->pd_point = val;
3230
3231        return 0; /* is this the right error code? */
3232}
3233
3234/*
3235 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3236 *
3237 * This option will allow a user to change the maximum burst of packets
3238 * that can be emitted by this association.  Note that the default value
3239 * is 4, and some implementations may restrict this setting so that it
3240 * can only be lowered.
3241 *
3242 * NOTE: This text doesn't seem right.  Do this on a socket basis with
3243 * future associations inheriting the socket value.
3244 */
3245static int sctp_setsockopt_maxburst(struct sock *sk,
3246                                    char __user *optval,
3247                                    unsigned int optlen)
3248{
3249        struct sctp_assoc_value params;
3250        struct sctp_sock *sp;
3251        struct sctp_association *asoc;
3252        int val;
3253        int assoc_id = 0;
3254
3255        if (optlen == sizeof(int)) {
3256                pr_warn("Use of int in max_burst socket option deprecated\n");
3257                pr_warn("Use struct sctp_assoc_value instead\n");
3258                if (copy_from_user(&val, optval, optlen))
3259                        return -EFAULT;
3260        } else if (optlen == sizeof(struct sctp_assoc_value)) {
3261                if (copy_from_user(&params, optval, optlen))
3262                        return -EFAULT;
3263                val = params.assoc_value;
3264                assoc_id = params.assoc_id;
3265        } else
3266                return -EINVAL;
3267
3268        sp = sctp_sk(sk);
3269
3270        if (assoc_id != 0) {
3271                asoc = sctp_id2assoc(sk, assoc_id);
3272                if (!asoc)
3273                        return -EINVAL;
3274                asoc->max_burst = val;
3275        } else
3276                sp->max_burst = val;
3277
3278        return 0;
3279}
3280
3281/*
3282 * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3283 *
3284 * This set option adds a chunk type that the user is requesting to be
3285 * received only in an authenticated way.  Changes to the list of chunks
3286 * will only effect future associations on the socket.
3287 */
3288static int sctp_setsockopt_auth_chunk(struct sock *sk,
3289                                      char __user *optval,
3290                                      unsigned int optlen)
3291{
3292        struct net *net = sock_net(sk);
3293        struct sctp_authchunk val;
3294
3295        if (!net->sctp.auth_enable)
3296                return -EACCES;
3297
3298        if (optlen != sizeof(struct sctp_authchunk))
3299                return -EINVAL;
3300        if (copy_from_user(&val, optval, optlen))
3301                return -EFAULT;
3302
3303        switch (val.sauth_chunk) {
3304        case SCTP_CID_INIT:
3305        case SCTP_CID_INIT_ACK:
3306        case SCTP_CID_SHUTDOWN_COMPLETE:
3307        case SCTP_CID_AUTH:
3308                return -EINVAL;
3309        }
3310
3311        /* add this chunk id to the endpoint */
3312        return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3313}
3314
3315/*
3316 * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3317 *
3318 * This option gets or sets the list of HMAC algorithms that the local
3319 * endpoint requires the peer to use.
3320 */
3321static int sctp_setsockopt_hmac_ident(struct sock *sk,
3322                                      char __user *optval,
3323                                      unsigned int optlen)
3324{
3325        struct net *net = sock_net(sk);
3326        struct sctp_hmacalgo *hmacs;
3327        u32 idents;
3328        int err;
3329
3330        if (!net->sctp.auth_enable)
3331                return -EACCES;
3332
3333        if (optlen < sizeof(struct sctp_hmacalgo))
3334                return -EINVAL;
3335
3336        hmacs= memdup_user(optval, optlen);
3337        if (IS_ERR(hmacs))
3338                return PTR_ERR(hmacs);
3339
3340        idents = hmacs->shmac_num_idents;
3341        if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3342            (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3343                err = -EINVAL;
3344                goto out;
3345        }
3346
3347        err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3348out:
3349        kfree(hmacs);
3350        return err;
3351}
3352
3353/*
3354 * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3355 *
3356 * This option will set a shared secret key which is used to build an
3357 * association shared key.
3358 */
3359static int sctp_setsockopt_auth_key(struct sock *sk,
3360                                    char __user *optval,
3361                                    unsigned int optlen)
3362{
3363        struct net *net = sock_net(sk);
3364        struct sctp_authkey *authkey;
3365        struct sctp_association *asoc;
3366        int ret;
3367
3368        if (!net->sctp.auth_enable)
3369                return -EACCES;
3370
3371        if (optlen <= sizeof(struct sctp_authkey))
3372                return -EINVAL;
3373
3374        authkey= memdup_user(optval, optlen);
3375        if (IS_ERR(authkey))
3376                return PTR_ERR(authkey);
3377
3378        if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3379                ret = -EINVAL;
3380                goto out;
3381        }
3382
3383        asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3384        if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3385                ret = -EINVAL;
3386                goto out;
3387        }
3388
3389        ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3390out:
3391        kfree(authkey);
3392        return ret;
3393}
3394
3395/*
3396 * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3397 *
3398 * This option will get or set the active shared key to be used to build
3399 * the association shared key.
3400 */
3401static int sctp_setsockopt_active_key(struct sock *sk,
3402                                      char __user *optval,
3403                                      unsigned int optlen)
3404{
3405        struct net *net = sock_net(sk);
3406        struct sctp_authkeyid val;
3407        struct sctp_association *asoc;
3408
3409        if (!net->sctp.auth_enable)
3410                return -EACCES;
3411
3412        if (optlen != sizeof(struct sctp_authkeyid))
3413                return -EINVAL;
3414        if (copy_from_user(&val, optval, optlen))
3415                return -EFAULT;
3416
3417        asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3418        if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3419                return -EINVAL;
3420
3421        return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3422                                        val.scact_keynumber);
3423}
3424
3425/*
3426 * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3427 *
3428 * This set option will delete a shared secret key from use.
3429 */
3430static int sctp_setsockopt_del_key(struct sock *sk,
3431                                   char __user *optval,
3432                                   unsigned int optlen)
3433{
3434        struct net *net = sock_net(sk);
3435        struct sctp_authkeyid val;
3436        struct sctp_association *asoc;
3437
3438        if (!net->sctp.auth_enable)
3439                return -EACCES;
3440
3441        if (optlen != sizeof(struct sctp_authkeyid))
3442                return -EINVAL;
3443        if (copy_from_user(&val, optval, optlen))
3444                return -EFAULT;
3445
3446        asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3447        if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3448                return -EINVAL;
3449
3450        return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3451                                    val.scact_keynumber);
3452
3453}
3454
3455/*
3456 * 8.1.23 SCTP_AUTO_ASCONF
3457 *
3458 * This option will enable or disable the use of the automatic generation of
3459 * ASCONF chunks to add and delete addresses to an existing association.  Note
3460 * that this option has two caveats namely: a) it only affects sockets that
3461 * are bound to all addresses available to the SCTP stack, and b) the system
3462 * administrator may have an overriding control that turns the ASCONF feature
3463 * off no matter what setting the socket option may have.
3464 * This option expects an integer boolean flag, where a non-zero value turns on
3465 * the option, and a zero value turns off the option.
3466 * Note. In this implementation, socket operation overrides default parameter
3467 * being set by sysctl as well as FreeBSD implementation
3468 */
3469static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3470                                        unsigned int optlen)
3471{
3472        int val;
3473        struct sctp_sock *sp = sctp_sk(sk);
3474
3475        if (optlen < sizeof(int))
3476                return -EINVAL;
3477        if (get_user(val, (int __user *)optval))
3478                return -EFAULT;
3479        if (!sctp_is_ep_boundall(sk) && val)
3480                return -EINVAL;
3481        if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3482                return 0;
3483
3484        if (val == 0 && sp->do_auto_asconf) {
3485                list_del(&sp->auto_asconf_list);
3486                sp->do_auto_asconf = 0;
3487        } else if (val && !sp->do_auto_asconf) {
3488                list_add_tail(&sp->auto_asconf_list,
3489                    &sock_net(sk)->sctp.auto_asconf_splist);
3490                sp->do_auto_asconf = 1;
3491        }
3492        return 0;
3493}
3494
3495
3496/*
3497 * SCTP_PEER_ADDR_THLDS
3498 *
3499 * This option allows us to alter the partially failed threshold for one or all
3500 * transports in an association.  See Section 6.1 of:
3501 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3502 */
3503static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3504                                            char __user *optval,
3505                                            unsigned int optlen)
3506{
3507        struct sctp_paddrthlds val;
3508        struct sctp_transport *trans;
3509        struct sctp_association *asoc;
3510
3511        if (optlen < sizeof(struct sctp_paddrthlds))
3512                return -EINVAL;
3513        if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3514                           sizeof(struct sctp_paddrthlds)))
3515                return -EFAULT;
3516
3517
3518        if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3519                asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3520                if (!asoc)
3521                        return -ENOENT;
3522                list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3523                                    transports) {
3524                        if (val.spt_pathmaxrxt)
3525                                trans->pathmaxrxt = val.spt_pathmaxrxt;
3526                        trans->pf_retrans = val.spt_pathpfthld;
3527                }
3528
3529                if (val.spt_pathmaxrxt)
3530                        asoc->pathmaxrxt = val.spt_pathmaxrxt;
3531                asoc->pf_retrans = val.spt_pathpfthld;
3532        } else {
3533                trans = sctp_addr_id2transport(sk, &val.spt_address,
3534                                               val.spt_assoc_id);
3535                if (!trans)
3536                        return -ENOENT;
3537
3538                if (val.spt_pathmaxrxt)
3539                        trans->pathmaxrxt = val.spt_pathmaxrxt;
3540                trans->pf_retrans = val.spt_pathpfthld;
3541        }
3542
3543        return 0;
3544}
3545
3546/* API 6.2 setsockopt(), getsockopt()
3547 *
3548 * Applications use setsockopt() and getsockopt() to set or retrieve
3549 * socket options.  Socket options are used to change the default
3550 * behavior of sockets calls.  They are described in Section 7.
3551 *
3552 * The syntax is:
3553 *
3554 *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
3555 *                    int __user *optlen);
3556 *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3557 *                    int optlen);
3558 *
3559 *   sd      - the socket descript.
3560 *   level   - set to IPPROTO_SCTP for all SCTP options.
3561 *   optname - the option name.
3562 *   optval  - the buffer to store the value of the option.
3563 *   optlen  - the size of the buffer.
3564 */
3565SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3566                                char __user *optval, unsigned int optlen)
3567{
3568        int retval = 0;
3569
3570        SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3571                          sk, optname);
3572
3573        /* I can hardly begin to describe how wrong this is.  This is
3574         * so broken as to be worse than useless.  The API draft
3575         * REALLY is NOT helpful here...  I am not convinced that the
3576         * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3577         * are at all well-founded.
3578         */
3579        if (level != SOL_SCTP) {
3580                struct sctp_af *af = sctp_sk(sk)->pf->af;
3581                retval = af->setsockopt(sk, level, optname, optval, optlen);
3582                goto out_nounlock;
3583        }
3584
3585        sctp_lock_sock(sk);
3586
3587        switch (optname) {
3588        case SCTP_SOCKOPT_BINDX_ADD:
3589                /* 'optlen' is the size of the addresses buffer. */
3590                retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3591                                               optlen, SCTP_BINDX_ADD_ADDR);
3592                break;
3593
3594        case SCTP_SOCKOPT_BINDX_REM:
3595                /* 'optlen' is the size of the addresses buffer. */
3596                retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3597                                               optlen, SCTP_BINDX_REM_ADDR);
3598                break;
3599
3600        case SCTP_SOCKOPT_CONNECTX_OLD:
3601                /* 'optlen' is the size of the addresses buffer. */
3602                retval = sctp_setsockopt_connectx_old(sk,
3603                                            (struct sockaddr __user *)optval,
3604                                            optlen);
3605                break;
3606
3607        case SCTP_SOCKOPT_CONNECTX:
3608                /* 'optlen' is the size of the addresses buffer. */
3609                retval = sctp_setsockopt_connectx(sk,
3610                                            (struct sockaddr __user *)optval,
3611                                            optlen);
3612                break;
3613
3614        case SCTP_DISABLE_FRAGMENTS:
3615                retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3616                break;
3617
3618        case SCTP_EVENTS:
3619                retval = sctp_setsockopt_events(sk, optval, optlen);
3620                break;
3621
3622        case SCTP_AUTOCLOSE:
3623                retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3624                break;
3625
3626        case SCTP_PEER_ADDR_PARAMS:
3627                retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3628                break;
3629
3630        case SCTP_DELAYED_SACK:
3631                retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3632                break;
3633        case SCTP_PARTIAL_DELIVERY_POINT:
3634                retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3635                break;
3636
3637        case SCTP_INITMSG:
3638                retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3639                break;
3640        case SCTP_DEFAULT_SEND_PARAM:
3641                retval = sctp_setsockopt_default_send_param(sk, optval,
3642                                                            optlen);
3643                break;
3644        case SCTP_PRIMARY_ADDR:
3645                retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3646                break;
3647        case SCTP_SET_PEER_PRIMARY_ADDR:
3648                retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3649                break;
3650        case SCTP_NODELAY:
3651                retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3652                break;
3653        case SCTP_RTOINFO:
3654                retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3655                break;
3656        case SCTP_ASSOCINFO:
3657                retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3658                break;
3659        case SCTP_I_WANT_MAPPED_V4_ADDR:
3660                retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3661                break;
3662        case SCTP_MAXSEG:
3663                retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3664                break;
3665        case SCTP_ADAPTATION_LAYER:
3666                retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3667                break;
3668        case SCTP_CONTEXT:
3669                retval = sctp_setsockopt_context(sk, optval, optlen);
3670                break;
3671        case SCTP_FRAGMENT_INTERLEAVE:
3672                retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3673                break;
3674        case SCTP_MAX_BURST:
3675                retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3676                break;
3677        case SCTP_AUTH_CHUNK:
3678                retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3679                break;
3680        case SCTP_HMAC_IDENT:
3681                retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3682                break;
3683        case SCTP_AUTH_KEY:
3684                retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3685                break;
3686        case SCTP_AUTH_ACTIVE_KEY:
3687                retval = sctp_setsockopt_active_key(sk, optval, optlen);
3688                break;
3689        case SCTP_AUTH_DELETE_KEY:
3690                retval = sctp_setsockopt_del_key(sk, optval, optlen);
3691                break;
3692        case SCTP_AUTO_ASCONF:
3693                retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3694                break;
3695        case SCTP_PEER_ADDR_THLDS:
3696                retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3697                break;
3698        default:
3699                retval = -ENOPROTOOPT;
3700                break;
3701        }
3702
3703        sctp_release_sock(sk);
3704
3705out_nounlock:
3706        return retval;
3707}
3708
3709/* API 3.1.6 connect() - UDP Style Syntax
3710 *
3711 * An application may use the connect() call in the UDP model to initiate an
3712 * association without sending data.
3713 *
3714 * The syntax is:
3715 *
3716 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3717 *
3718 * sd: the socket descriptor to have a new association added to.
3719 *
3720 * nam: the address structure (either struct sockaddr_in or struct
3721 *    sockaddr_in6 defined in RFC2553 [7]).
3722 *
3723 * len: the size of the address.
3724 */
3725SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3726                             int addr_len)
3727{
3728        int err = 0;
3729        struct sctp_af *af;
3730
3731        sctp_lock_sock(sk);
3732
3733        SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3734                          __func__, sk, addr, addr_len);
3735
3736        /* Validate addr_len before calling common connect/connectx routine. */
3737        af = sctp_get_af_specific(addr->sa_family);
3738        if (!af || addr_len < af->sockaddr_len) {
3739                err = -EINVAL;
3740        } else {
3741                /* Pass correct addr len to common routine (so it knows there
3742                 * is only one address being passed.
3743                 */
3744                err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3745        }
3746
3747        sctp_release_sock(sk);
3748        return err;
3749}
3750
3751/* FIXME: Write comments. */
3752SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3753{
3754        return -EOPNOTSUPP; /* STUB */
3755}
3756
3757/* 4.1.4 accept() - TCP Style Syntax
3758 *
3759 * Applications use accept() call to remove an established SCTP
3760 * association from the accept queue of the endpoint.  A new socket
3761 * descriptor will be returned from accept() to represent the newly
3762 * formed association.
3763 */
3764SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3765{
3766        struct sctp_sock *sp;
3767        struct sctp_endpoint *ep;
3768        struct sock *newsk = NULL;
3769        struct sctp_association *asoc;
3770        long timeo;
3771        int error = 0;
3772
3773        sctp_lock_sock(sk);
3774
3775        sp = sctp_sk(sk);
3776        ep = sp->ep;
3777
3778        if (!sctp_style(sk, TCP)) {
3779                error = -EOPNOTSUPP;
3780                goto out;
3781        }
3782
3783        if (!sctp_sstate(sk, LISTENING)) {
3784                error = -EINVAL;
3785                goto out;
3786        }
3787
3788        timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3789
3790        error = sctp_wait_for_accept(sk, timeo);
3791        if (error)
3792                goto out;
3793
3794        /* We treat the list of associations on the endpoint as the accept
3795         * queue and pick the first association on the list.
3796         */
3797        asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3798
3799        newsk = sp->pf->create_accept_sk(sk, asoc);
3800        if (!newsk) {
3801                error = -ENOMEM;
3802                goto out;
3803        }
3804
3805        /* Populate the fields of the newsk from the oldsk and migrate the
3806         * asoc to the newsk.
3807         */
3808        sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3809
3810out:
3811        sctp_release_sock(sk);
3812        *err = error;
3813        return newsk;
3814}
3815
3816/* The SCTP ioctl handler. */
3817SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3818{
3819        int rc = -ENOTCONN;
3820
3821        sctp_lock_sock(sk);
3822
3823        /*
3824         * SEQPACKET-style sockets in LISTENING state are valid, for
3825         * SCTP, so only discard TCP-style sockets in LISTENING state.
3826         */
3827        if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3828                goto out;
3829
3830        switch (cmd) {
3831        case SIOCINQ: {
3832                struct sk_buff *skb;
3833                unsigned int amount = 0;
3834
3835                skb = skb_peek(&sk->sk_receive_queue);
3836                if (skb != NULL) {
3837                        /*
3838                         * We will only return the amount of this packet since
3839                         * that is all that will be read.
3840                         */
3841                        amount = skb->len;
3842                }
3843                rc = put_user(amount, (int __user *)arg);
3844                break;
3845        }
3846        default:
3847                rc = -ENOIOCTLCMD;
3848                break;
3849        }
3850out:
3851        sctp_release_sock(sk);
3852        return rc;
3853}
3854
3855/* This is the function which gets called during socket creation to
3856 * initialized the SCTP-specific portion of the sock.
3857 * The sock structure should already be zero-filled memory.
3858 */
3859SCTP_STATIC int sctp_init_sock(struct sock *sk)
3860{
3861        struct net *net = sock_net(sk);
3862        struct sctp_endpoint *ep;
3863        struct sctp_sock *sp;
3864
3865        SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3866
3867        sp = sctp_sk(sk);
3868
3869        /* Initialize the SCTP per socket area.  */
3870        switch (sk->sk_type) {
3871        case SOCK_SEQPACKET:
3872                sp->type = SCTP_SOCKET_UDP;
3873                break;
3874        case SOCK_STREAM:
3875                sp->type = SCTP_SOCKET_TCP;
3876                break;
3877        default:
3878                return -ESOCKTNOSUPPORT;
3879        }
3880
3881        /* Initialize default send parameters. These parameters can be
3882         * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3883         */
3884        sp->default_stream = 0;
3885        sp->default_ppid = 0;
3886        sp->default_flags = 0;
3887        sp->default_context = 0;
3888        sp->default_timetolive = 0;
3889
3890        sp->default_rcv_context = 0;
3891        sp->max_burst = net->sctp.max_burst;
3892
3893        /* Initialize default setup parameters. These parameters
3894         * can be modified with the SCTP_INITMSG socket option or
3895         * overridden by the SCTP_INIT CMSG.
3896         */
3897        sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
3898        sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
3899        sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
3900        sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
3901
3902        /* Initialize default RTO related parameters.  These parameters can
3903         * be modified for with the SCTP_RTOINFO socket option.
3904         */
3905        sp->rtoinfo.srto_initial = net->sctp.rto_initial;
3906        sp->rtoinfo.srto_max     = net->sctp.rto_max;
3907        sp->rtoinfo.srto_min     = net->sctp.rto_min;
3908
3909        /* Initialize default association related parameters. These parameters
3910         * can be modified with the SCTP_ASSOCINFO socket option.
3911         */
3912        sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
3913        sp->assocparams.sasoc_number_peer_destinations = 0;
3914        sp->assocparams.sasoc_peer_rwnd = 0;
3915        sp->assocparams.sasoc_local_rwnd = 0;
3916        sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
3917
3918        /* Initialize default event subscriptions. By default, all the
3919         * options are off.
3920         */
3921        memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3922
3923        /* Default Peer Address Parameters.  These defaults can
3924         * be modified via SCTP_PEER_ADDR_PARAMS
3925         */
3926        sp->hbinterval  = net->sctp.hb_interval;
3927        sp->pathmaxrxt  = net->sctp.max_retrans_path;
3928        sp->pathmtu     = 0; // allow default discovery
3929        sp->sackdelay   = net->sctp.sack_timeout;
3930        sp->sackfreq    = 2;
3931        sp->param_flags = SPP_HB_ENABLE |
3932                          SPP_PMTUD_ENABLE |
3933                          SPP_SACKDELAY_ENABLE;
3934
3935        /* If enabled no SCTP message fragmentation will be performed.
3936         * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3937         */
3938        sp->disable_fragments = 0;
3939
3940        /* Enable Nagle algorithm by default.  */
3941        sp->nodelay           = 0;
3942
3943        /* Enable by default. */
3944        sp->v4mapped          = 1;
3945
3946        /* Auto-close idle associations after the configured
3947         * number of seconds.  A value of 0 disables this
3948         * feature.  Configure through the SCTP_AUTOCLOSE socket option,
3949         * for UDP-style sockets only.
3950         */
3951        sp->autoclose         = 0;
3952
3953        /* User specified fragmentation limit. */
3954        sp->user_frag         = 0;
3955
3956        sp->adaptation_ind = 0;
3957
3958        sp->pf = sctp_get_pf_specific(sk->sk_family);
3959
3960        /* Control variables for partial data delivery. */
3961        atomic_set(&sp->pd_mode, 0);
3962        skb_queue_head_init(&sp->pd_lobby);
3963        sp->frag_interleave = 0;
3964
3965        /* Create a per socket endpoint structure.  Even if we
3966         * change the data structure relationships, this may still
3967         * be useful for storing pre-connect address information.
3968         */
3969        ep = sctp_endpoint_new(sk, GFP_KERNEL);
3970        if (!ep)
3971                return -ENOMEM;
3972
3973        sp->ep = ep;
3974        sp->hmac = NULL;
3975
3976        SCTP_DBG_OBJCNT_INC(sock);
3977
3978        local_bh_disable();
3979        percpu_counter_inc(&sctp_sockets_allocated);
3980        sock_prot_inuse_add(net, sk->sk_prot, 1);
3981        if (net->sctp.default_auto_asconf) {
3982                list_add_tail(&sp->auto_asconf_list,
3983                    &net->sctp.auto_asconf_splist);
3984                sp->do_auto_asconf = 1;
3985        } else
3986                sp->do_auto_asconf = 0;
3987        local_bh_enable();
3988
3989        return 0;
3990}
3991
3992/* Cleanup any SCTP per socket resources.  */
3993SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3994{
3995        struct sctp_sock *sp;
3996
3997        SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
3998
3999        /* Release our hold on the endpoint. */
4000        sp = sctp_sk(sk);
4001        if (sp->do_auto_asconf) {
4002                sp->do_auto_asconf = 0;
4003                list_del(&sp->auto_asconf_list);
4004        }
4005        sctp_endpoint_free(sp->ep);
4006        local_bh_disable();
4007        percpu_counter_dec(&sctp_sockets_allocated);
4008        sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4009        local_bh_enable();
4010}
4011
4012/* API 4.1.7 shutdown() - TCP Style Syntax
4013 *     int shutdown(int socket, int how);
4014 *
4015 *     sd      - the socket descriptor of the association to be closed.
4016 *     how     - Specifies the type of shutdown.  The  values  are
4017 *               as follows:
4018 *               SHUT_RD
4019 *                     Disables further receive operations. No SCTP
4020 *                     protocol action is taken.
4021 *               SHUT_WR
4022 *                     Disables further send operations, and initiates
4023 *                     the SCTP shutdown sequence.
4024 *               SHUT_RDWR
4025 *                     Disables further send  and  receive  operations
4026 *                     and initiates the SCTP shutdown sequence.
4027 */
4028SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
4029{
4030        struct net *net = sock_net(sk);
4031        struct sctp_endpoint *ep;
4032        struct sctp_association *asoc;
4033
4034        if (!sctp_style(sk, TCP))
4035                return;
4036
4037        if (how & SEND_SHUTDOWN) {
4038                ep = sctp_sk(sk)->ep;
4039                if (!list_empty(&ep->asocs)) {
4040                        asoc = list_entry(ep->asocs.next,
4041                                          struct sctp_association, asocs);
4042                        sctp_primitive_SHUTDOWN(net, asoc, NULL);
4043                }
4044        }
4045}
4046
4047/* 7.2.1 Association Status (SCTP_STATUS)
4048
4049 * Applications can retrieve current status information about an
4050 * association, including association state, peer receiver window size,
4051 * number of unacked data chunks, and number of data chunks pending
4052 * receipt.  This information is read-only.
4053 */
4054static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4055                                       char __user *optval,
4056                                       int __user *optlen)
4057{
4058        struct sctp_status status;
4059        struct sctp_association *asoc = NULL;
4060        struct sctp_transport *transport;
4061        sctp_assoc_t associd;
4062        int retval = 0;
4063
4064        if (len < sizeof(status)) {
4065                retval = -EINVAL;
4066                goto out;
4067        }
4068
4069        len = sizeof(status);
4070        if (copy_from_user(&status, optval, len)) {
4071                retval = -EFAULT;
4072                goto out;
4073        }
4074
4075        associd = status.sstat_assoc_id;
4076        asoc = sctp_id2assoc(sk, associd);
4077        if (!asoc) {
4078                retval = -EINVAL;
4079                goto out;
4080        }
4081
4082        transport = asoc->peer.primary_path;
4083
4084        status.sstat_assoc_id = sctp_assoc2id(asoc);
4085        status.sstat_state = asoc->state;
4086        status.sstat_rwnd =  asoc->peer.rwnd;
4087        status.sstat_unackdata = asoc->unack_data;
4088
4089        status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4090        status.sstat_instrms = asoc->c.sinit_max_instreams;
4091        status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4092        status.sstat_fragmentation_point = asoc->frag_point;
4093        status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4094        memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4095                        transport->af_specific->sockaddr_len);
4096        /* Map ipv4 address into v4-mapped-on-v6 address.  */
4097        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4098                (union sctp_addr *)&status.sstat_primary.spinfo_address);
4099        status.sstat_primary.spinfo_state = transport->state;
4100        status.sstat_primary.spinfo_cwnd = transport->cwnd;
4101        status.sstat_primary.spinfo_srtt = transport->srtt;
4102        status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4103        status.sstat_primary.spinfo_mtu = transport->pathmtu;
4104
4105        if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4106                status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4107
4108        if (put_user(len, optlen)) {
4109                retval = -EFAULT;
4110                goto out;
4111        }
4112
4113        SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
4114                          len, status.sstat_state, status.sstat_rwnd,
4115                          status.sstat_assoc_id);
4116
4117        if (copy_to_user(optval, &status, len)) {
4118                retval = -EFAULT;
4119                goto out;
4120        }
4121
4122out:
4123        return retval;
4124}
4125
4126
4127/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4128 *
4129 * Applications can retrieve information about a specific peer address
4130 * of an association, including its reachability state, congestion
4131 * window, and retransmission timer values.  This information is
4132 * read-only.
4133 */
4134static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4135                                          char __user *optval,
4136                                          int __user *optlen)
4137{
4138        struct sctp_paddrinfo pinfo;
4139        struct sctp_transport *transport;
4140        int retval = 0;
4141
4142        if (len < sizeof(pinfo)) {
4143                retval = -EINVAL;
4144                goto out;
4145        }
4146
4147        len = sizeof(pinfo);
4148        if (copy_from_user(&pinfo, optval, len)) {
4149                retval = -EFAULT;
4150                goto out;
4151        }
4152
4153        transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4154                                           pinfo.spinfo_assoc_id);
4155        if (!transport)
4156                return -EINVAL;
4157
4158        pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4159        pinfo.spinfo_state = transport->state;
4160        pinfo.spinfo_cwnd = transport->cwnd;
4161        pinfo.spinfo_srtt = transport->srtt;
4162        pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4163        pinfo.spinfo_mtu = transport->pathmtu;
4164
4165        if (pinfo.spinfo_state == SCTP_UNKNOWN)
4166                pinfo.spinfo_state = SCTP_ACTIVE;
4167
4168        if (put_user(len, optlen)) {
4169                retval = -EFAULT;
4170                goto out;
4171        }
4172
4173        if (copy_to_user(optval, &pinfo, len)) {
4174                retval = -EFAULT;
4175                goto out;
4176        }
4177
4178out:
4179        return retval;
4180}
4181
4182/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4183 *
4184 * This option is a on/off flag.  If enabled no SCTP message
4185 * fragmentation will be performed.  Instead if a message being sent
4186 * exceeds the current PMTU size, the message will NOT be sent and
4187 * instead a error will be indicated to the user.
4188 */
4189static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4190                                        char __user *optval, int __user *optlen)
4191{
4192        int val;
4193
4194        if (len < sizeof(int))
4195                return -EINVAL;
4196
4197        len = sizeof(int);
4198        val = (sctp_sk(sk)->disable_fragments == 1);
4199        if (put_user(len, optlen))
4200                return -EFAULT;
4201        if (copy_to_user(optval, &val, len))
4202                return -EFAULT;
4203        return 0;
4204}
4205
4206/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4207 *
4208 * This socket option is used to specify various notifications and
4209 * ancillary data the user wishes to receive.
4210 */
4211static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4212                                  int __user *optlen)
4213{
4214        if (len <= 0)
4215                return -EINVAL;
4216        if (len > sizeof(struct sctp_event_subscribe))
4217                len = sizeof(struct sctp_event_subscribe);
4218        if (put_user(len, optlen))
4219                return -EFAULT;
4220        if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4221                return -EFAULT;
4222        return 0;
4223}
4224
4225/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4226 *
4227 * This socket option is applicable to the UDP-style socket only.  When
4228 * set it will cause associations that are idle for more than the
4229 * specified number of seconds to automatically close.  An association
4230 * being idle is defined an association that has NOT sent or received
4231 * user data.  The special value of '0' indicates that no automatic
4232 * close of any associations should be performed.  The option expects an
4233 * integer defining the number of seconds of idle time before an
4234 * association is closed.
4235 */
4236static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4237{
4238        /* Applicable to UDP-style socket only */
4239        if (sctp_style(sk, TCP))
4240                return -EOPNOTSUPP;
4241        if (len < sizeof(int))
4242                return -EINVAL;
4243        len = sizeof(int);
4244        if (put_user(len, optlen))
4245                return -EFAULT;
4246        if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4247                return -EFAULT;
4248        return 0;
4249}
4250
4251/* Helper routine to branch off an association to a new socket.  */
4252int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4253{
4254        struct sctp_association *asoc = sctp_id2assoc(sk, id);
4255        struct socket *sock;
4256        struct sctp_af *af;
4257        int err = 0;
4258
4259        if (!asoc)
4260                return -EINVAL;
4261
4262        /* An association cannot be branched off from an already peeled-off
4263         * socket, nor is this supported for tcp style sockets.
4264         */
4265        if (!sctp_style(sk, UDP))
4266                return -EINVAL;
4267
4268        /* Create a new socket.  */
4269        err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4270        if (err < 0)
4271                return err;
4272
4273        sctp_copy_sock(sock->sk, sk, asoc);
4274
4275        /* Make peeled-off sockets more like 1-1 accepted sockets.
4276         * Set the daddr and initialize id to something more random
4277         */
4278        af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4279        af->to_sk_daddr(&asoc->peer.primary_addr, sk);
4280
4281        /* Populate the fields of the newsk from the oldsk and migrate the
4282         * asoc to the newsk.
4283         */
4284        sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4285
4286        *sockp = sock;
4287
4288        return err;
4289}
4290EXPORT_SYMBOL(sctp_do_peeloff);
4291
4292static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4293{
4294        sctp_peeloff_arg_t peeloff;
4295        struct socket *newsock;
4296        struct file *newfile;
4297        int retval = 0;
4298
4299        if (len < sizeof(sctp_peeloff_arg_t))
4300                return -EINVAL;
4301        len = sizeof(sctp_peeloff_arg_t);
4302        if (copy_from_user(&peeloff, optval, len))
4303                return -EFAULT;
4304
4305        retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4306        if (retval < 0)
4307                goto out;
4308
4309        /* Map the socket to an unused fd that can be returned to the user.  */
4310        retval = get_unused_fd();
4311        if (retval < 0) {
4312                sock_release(newsock);
4313                goto out;
4314        }
4315
4316        newfile = sock_alloc_file(newsock, 0, NULL);
4317        if (unlikely(IS_ERR(newfile))) {
4318                put_unused_fd(retval);
4319                sock_release(newsock);
4320                return PTR_ERR(newfile);
4321        }
4322
4323        SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
4324                          __func__, sk, newsock->sk, retval);
4325
4326        /* Return the fd mapped to the new socket.  */
4327        if (put_user(len, optlen)) {
4328                fput(newfile);
4329                put_unused_fd(retval);
4330                return -EFAULT;
4331        }
4332        peeloff.sd = retval;
4333        if (copy_to_user(optval, &peeloff, len)) {
4334                fput(newfile);
4335                put_unused_fd(retval);
4336                return -EFAULT;
4337        }
4338        fd_install(retval, newfile);
4339out:
4340        return retval;
4341}
4342
4343/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4344 *
4345 * Applications can enable or disable heartbeats for any peer address of
4346 * an association, modify an address's heartbeat interval, force a
4347 * heartbeat to be sent immediately, and adjust the address's maximum
4348 * number of retransmissions sent before an address is considered
4349 * unreachable.  The following structure is used to access and modify an
4350 * address's parameters:
4351 *
4352 *  struct sctp_paddrparams {
4353 *     sctp_assoc_t            spp_assoc_id;
4354 *     struct sockaddr_storage spp_address;
4355 *     uint32_t                spp_hbinterval;
4356 *     uint16_t                spp_pathmaxrxt;
4357 *     uint32_t                spp_pathmtu;
4358 *     uint32_t                spp_sackdelay;
4359 *     uint32_t                spp_flags;
4360 * };
4361 *
4362 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
4363 *                     application, and identifies the association for
4364 *                     this query.
4365 *   spp_address     - This specifies which address is of interest.
4366 *   spp_hbinterval  - This contains the value of the heartbeat interval,
4367 *                     in milliseconds.  If a  value of zero
4368 *                     is present in this field then no changes are to
4369 *                     be made to this parameter.
4370 *   spp_pathmaxrxt  - This contains the maximum number of
4371 *                     retransmissions before this address shall be
4372 *                     considered unreachable. If a  value of zero
4373 *                     is present in this field then no changes are to
4374 *                     be made to this parameter.
4375 *   spp_pathmtu     - When Path MTU discovery is disabled the value
4376 *                     specified here will be the "fixed" path mtu.
4377 *                     Note that if the spp_address field is empty
4378 *                     then all associations on this address will
4379 *                     have this fixed path mtu set upon them.
4380 *
4381 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
4382 *                     the number of milliseconds that sacks will be delayed
4383 *                     for. This value will apply to all addresses of an
4384 *                     association if the spp_address field is empty. Note
4385 *                     also, that if delayed sack is enabled and this
4386 *                     value is set to 0, no change is made to the last
4387 *                     recorded delayed sack timer value.
4388 *
4389 *   spp_flags       - These flags are used to control various features
4390 *                     on an association. The flag field may contain
4391 *                     zero or more of the following options.
4392 *
4393 *                     SPP_HB_ENABLE  - Enable heartbeats on the
4394 *                     specified address. Note that if the address
4395 *                     field is empty all addresses for the association
4396 *                     have heartbeats enabled upon them.
4397 *
4398 *                     SPP_HB_DISABLE - Disable heartbeats on the
4399 *                     speicifed address. Note that if the address
4400 *                     field is empty all addresses for the association
4401 *                     will have their heartbeats disabled. Note also
4402 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
4403 *                     mutually exclusive, only one of these two should
4404 *                     be specified. Enabling both fields will have
4405 *                     undetermined results.
4406 *
4407 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
4408 *                     to be made immediately.
4409 *
4410 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
4411 *                     discovery upon the specified address. Note that
4412 *                     if the address feild is empty then all addresses
4413 *                     on the association are effected.
4414 *
4415 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
4416 *                     discovery upon the specified address. Note that
4417 *                     if the address feild is empty then all addresses
4418 *                     on the association are effected. Not also that
4419 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4420 *                     exclusive. Enabling both will have undetermined
4421 *                     results.
4422 *
4423 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
4424 *                     on delayed sack. The time specified in spp_sackdelay
4425 *                     is used to specify the sack delay for this address. Note
4426 *                     that if spp_address is empty then all addresses will
4427 *                     enable delayed sack and take on the sack delay
4428 *                     value specified in spp_sackdelay.
4429 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
4430 *                     off delayed sack. If the spp_address field is blank then
4431 *                     delayed sack is disabled for the entire association. Note
4432 *                     also that this field is mutually exclusive to
4433 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
4434 *                     results.
4435 */
4436static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4437                                            char __user *optval, int __user *optlen)
4438{
4439        struct sctp_paddrparams  params;
4440        struct sctp_transport   *trans = NULL;
4441        struct sctp_association *asoc = NULL;
4442        struct sctp_sock        *sp = sctp_sk(sk);
4443
4444        if (len < sizeof(struct sctp_paddrparams))
4445                return -EINVAL;
4446        len = sizeof(struct sctp_paddrparams);
4447        if (copy_from_user(&params, optval, len))
4448                return -EFAULT;
4449
4450        /* If an address other than INADDR_ANY is specified, and
4451         * no transport is found, then the request is invalid.
4452         */
4453        if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
4454                trans = sctp_addr_id2transport(sk, &params.spp_address,
4455                                               params.spp_assoc_id);
4456                if (!trans) {
4457                        SCTP_DEBUG_PRINTK("Failed no transport\n");
4458                        return -EINVAL;
4459                }
4460        }
4461
4462        /* Get association, if assoc_id != 0 and the socket is a one
4463         * to many style socket, and an association was not found, then
4464         * the id was invalid.
4465         */
4466        asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4467        if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4468                SCTP_DEBUG_PRINTK("Failed no association\n");
4469                return -EINVAL;
4470        }
4471
4472        if (trans) {
4473                /* Fetch transport values. */
4474                params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4475                params.spp_pathmtu    = trans->pathmtu;
4476                params.spp_pathmaxrxt = trans->pathmaxrxt;
4477                params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);
4478
4479                /*draft-11 doesn't say what to return in spp_flags*/
4480                params.spp_flags      = trans->param_flags;
4481        } else if (asoc) {
4482                /* Fetch association values. */
4483                params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4484                params.spp_pathmtu    = asoc->pathmtu;
4485                params.spp_pathmaxrxt = asoc->pathmaxrxt;
4486                params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);
4487
4488                /*draft-11 doesn't say what to return in spp_flags*/
4489                params.spp_flags      = asoc->param_flags;
4490        } else {
4491                /* Fetch socket values. */
4492                params.spp_hbinterval = sp->hbinterval;
4493                params.spp_pathmtu    = sp->pathmtu;
4494                params.spp_sackdelay  = sp->sackdelay;
4495                params.spp_pathmaxrxt = sp->pathmaxrxt;
4496
4497                /*draft-11 doesn't say what to return in spp_flags*/
4498                params.spp_flags      = sp->param_flags;
4499        }
4500
4501        if (copy_to_user(optval, &params, len))
4502                return -EFAULT;
4503
4504        if (put_user(len, optlen))
4505                return -EFAULT;
4506
4507        return 0;
4508}
4509
4510/*
4511 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
4512 *
4513 * This option will effect the way delayed acks are performed.  This
4514 * option allows you to get or set the delayed ack time, in
4515 * milliseconds.  It also allows changing the delayed ack frequency.
4516 * Changing the frequency to 1 disables the delayed sack algorithm.  If
4517 * the assoc_id is 0, then this sets or gets the endpoints default
4518 * values.  If the assoc_id field is non-zero, then the set or get
4519 * effects the specified association for the one to many model (the
4520 * assoc_id field is ignored by the one to one model).  Note that if
4521 * sack_delay or sack_freq are 0 when setting this option, then the
4522 * current values will remain unchanged.
4523 *
4524 * struct sctp_sack_info {
4525 *     sctp_assoc_t            sack_assoc_id;
4526 *     uint32_t                sack_delay;
4527 *     uint32_t                sack_freq;
4528 * };
4529 *
4530 * sack_assoc_id -  This parameter, indicates which association the user
4531 *    is performing an action upon.  Note that if this field's value is
4532 *    zero then the endpoints default value is changed (effecting future
4533 *    associations only).
4534 *
4535 * sack_delay -  This parameter contains the number of milliseconds that
4536 *    the user is requesting the delayed ACK timer be set to.  Note that
4537 *    this value is defined in the standard to be between 200 and 500
4538 *    milliseconds.
4539 *
4540 * sack_freq -  This parameter contains the number of packets that must
4541 *    be received before a sack is sent without waiting for the delay
4542 *    timer to expire.  The default value for this is 2, setting this
4543 *    value to 1 will disable the delayed sack algorithm.
4544 */
4545static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4546                                            char __user *optval,
4547                                            int __user *optlen)
4548{
4549        struct sctp_sack_info    params;
4550        struct sctp_association *asoc = NULL;
4551        struct sctp_sock        *sp = sctp_sk(sk);
4552
4553        if (len >= sizeof(struct sctp_sack_info)) {
4554                len = sizeof(struct sctp_sack_info);
4555
4556                if (copy_from_user(&params, optval, len))
4557                        return -EFAULT;
4558        } else if (len == sizeof(struct sctp_assoc_value)) {
4559                pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4560                pr_warn("Use struct sctp_sack_info instead\n");
4561                if (copy_from_user(&params, optval, len))
4562                        return -EFAULT;
4563        } else
4564                return - EINVAL;
4565
4566        /* Get association, if sack_assoc_id != 0 and the socket is a one
4567         * to many style socket, and an association was not found, then
4568         * the id was invalid.
4569         */
4570        asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4571        if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4572                return -EINVAL;
4573
4574        if (asoc) {
4575                /* Fetch association values. */
4576                if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4577                        params.sack_delay = jiffies_to_msecs(
4578                                asoc->sackdelay);
4579                        params.sack_freq = asoc->sackfreq;
4580
4581                } else {
4582                        params.sack_delay = 0;
4583                        params.sack_freq = 1;
4584                }
4585        } else {
4586                /* Fetch socket values. */
4587                if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4588                        params.sack_delay  = sp->sackdelay;
4589                        params.sack_freq = sp->sackfreq;
4590                } else {
4591                        params.sack_delay  = 0;
4592                        params.sack_freq = 1;
4593                }
4594        }
4595
4596        if (copy_to_user(optval, &params, len))
4597                return -EFAULT;
4598
4599        if (put_user(len, optlen))
4600                return -EFAULT;
4601
4602        return 0;
4603}
4604
4605/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4606 *
4607 * Applications can specify protocol parameters for the default association
4608 * initialization.  The option name argument to setsockopt() and getsockopt()
4609 * is SCTP_INITMSG.
4610 *
4611 * Setting initialization parameters is effective only on an unconnected
4612 * socket (for UDP-style sockets only future associations are effected
4613 * by the change).  With TCP-style sockets, this option is inherited by
4614 * sockets derived from a listener socket.
4615 */
4616static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4617{
4618        if (len < sizeof(struct sctp_initmsg))
4619                return -EINVAL;
4620        len = sizeof(struct sctp_initmsg);
4621        if (put_user(len, optlen))
4622                return -EFAULT;
4623        if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4624                return -EFAULT;
4625        return 0;
4626}
4627
4628
4629static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4630                                      char __user *optval, int __user *optlen)
4631{
4632        struct sctp_association *asoc;
4633        int cnt = 0;
4634        struct sctp_getaddrs getaddrs;
4635        struct sctp_transport *from;
4636        void __user *to;
4637        union sctp_addr temp;
4638        struct sctp_sock *sp = sctp_sk(sk);
4639        int addrlen;
4640        size_t space_left;
4641        int bytes_copied;
4642
4643        if (len < sizeof(struct sctp_getaddrs))
4644                return -EINVAL;
4645
4646        if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4647                return -EFAULT;
4648
4649        /* For UDP-style sockets, id specifies the association to query.  */
4650        asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4651        if (!asoc)
4652                return -EINVAL;
4653
4654        to = optval + offsetof(struct sctp_getaddrs,addrs);
4655        space_left = len - offsetof(struct sctp_getaddrs,addrs);
4656
4657        list_for_each_entry(from, &asoc->peer.transport_addr_list,
4658                                transports) {
4659                memcpy(&temp, &from->ipaddr, sizeof(temp));
4660                sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4661                addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4662                if (space_left < addrlen)
4663                        return -ENOMEM;
4664                if (copy_to_user(to, &temp, addrlen))
4665                        return -EFAULT;
4666                to += addrlen;
4667                cnt++;
4668                space_left -= addrlen;
4669        }
4670
4671        if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4672                return -EFAULT;
4673        bytes_copied = ((char __user *)to) - optval;
4674        if (put_user(bytes_copied, optlen))
4675                return -EFAULT;
4676
4677        return 0;
4678}
4679
4680static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4681                            size_t space_left, int *bytes_copied)
4682{
4683        struct sctp_sockaddr_entry *addr;
4684        union sctp_addr temp;
4685        int cnt = 0;
4686        int addrlen;
4687        struct net *net = sock_net(sk);
4688
4689        rcu_read_lock();
4690        list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4691                if (!addr->valid)
4692                        continue;
4693
4694                if ((PF_INET == sk->sk_family) &&
4695                    (AF_INET6 == addr->a.sa.sa_family))
4696                        continue;
4697                if ((PF_INET6 == sk->sk_family) &&
4698                    inet_v6_ipv6only(sk) &&
4699                    (AF_INET == addr->a.sa.sa_family))
4700                        continue;
4701                memcpy(&temp, &addr->a, sizeof(temp));
4702                if (!temp.v4.sin_port)
4703                        temp.v4.sin_port = htons(port);
4704
4705                sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4706                                                                &temp);
4707                addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4708                if (space_left < addrlen) {
4709                        cnt =  -ENOMEM;
4710                        break;
4711                }
4712                memcpy(to, &temp, addrlen);
4713
4714                to += addrlen;
4715                cnt ++;
4716                space_left -= addrlen;
4717                *bytes_copied += addrlen;
4718        }
4719        rcu_read_unlock();
4720
4721        return cnt;
4722}
4723
4724
4725static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4726                                       char __user *optval, int __user *optlen)
4727{
4728        struct sctp_bind_addr *bp;
4729        struct sctp_association *asoc;
4730        int cnt = 0;
4731        struct sctp_getaddrs getaddrs;
4732        struct sctp_sockaddr_entry *addr;
4733        void __user *to;
4734        union sctp_addr temp;
4735        struct sctp_sock *sp = sctp_sk(sk);
4736        int addrlen;
4737        int err = 0;
4738        size_t space_left;
4739        int bytes_copied = 0;
4740        void *addrs;
4741        void *buf;
4742
4743        if (len < sizeof(struct sctp_getaddrs))
4744                return -EINVAL;
4745
4746        if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4747                return -EFAULT;
4748
4749        /*
4750         *  For UDP-style sockets, id specifies the association to query.
4751         *  If the id field is set to the value '0' then the locally bound
4752         *  addresses are returned without regard to any particular
4753         *  association.
4754         */
4755        if (0 == getaddrs.assoc_id) {
4756                bp = &sctp_sk(sk)->ep->base.bind_addr;
4757        } else {
4758                asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4759                if (!asoc)
4760                        return -EINVAL;
4761                bp = &asoc->base.bind_addr;
4762        }
4763
4764        to = optval + offsetof(struct sctp_getaddrs,addrs);
4765        space_left = len - offsetof(struct sctp_getaddrs,addrs);
4766
4767        addrs = kmalloc(space_left, GFP_KERNEL);
4768        if (!addrs)
4769                return -ENOMEM;
4770
4771        /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4772         * addresses from the global local address list.
4773         */
4774        if (sctp_list_single_entry(&bp->address_list)) {
4775                addr = list_entry(bp->address_list.next,
4776                                  struct sctp_sockaddr_entry, list);
4777                if (sctp_is_any(sk, &addr->a)) {
4778                        cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4779                                                space_left, &bytes_copied);
4780                        if (cnt < 0) {
4781                                err = cnt;
4782                                goto out;
4783                        }
4784                        goto copy_getaddrs;
4785                }
4786        }
4787
4788        buf = addrs;
4789        /* Protection on the bound address list is not needed since
4790         * in the socket option context we hold a socket lock and
4791         * thus the bound address list can't change.
4792         */
4793        list_for_each_entry(addr, &bp->address_list, list) {
4794                memcpy(&temp, &addr->a, sizeof(temp));
4795                sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4796                addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4797                if (space_left < addrlen) {
4798                        err =  -ENOMEM; /*fixme: right error?*/
4799                        goto out;
4800                }
4801                memcpy(buf, &temp, addrlen);
4802                buf += addrlen;
4803                bytes_copied += addrlen;
4804                cnt ++;
4805                space_left -= addrlen;
4806        }
4807
4808copy_getaddrs:
4809        if (copy_to_user(to, addrs, bytes_copied)) {
4810                err = -EFAULT;
4811                goto out;
4812        }
4813        if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4814                err = -EFAULT;
4815                goto out;
4816        }
4817        if (put_user(bytes_copied, optlen))
4818                err = -EFAULT;
4819out:
4820        kfree(addrs);
4821        return err;
4822}
4823
4824/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4825 *
4826 * Requests that the local SCTP stack use the enclosed peer address as
4827 * the association primary.  The enclosed address must be one of the
4828 * association peer's addresses.
4829 */
4830static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4831                                        char __user *optval, int __user *optlen)
4832{
4833        struct sctp_prim prim;
4834        struct sctp_association *asoc;
4835        struct sctp_sock *sp = sctp_sk(sk);
4836
4837        if (len < sizeof(struct sctp_prim))
4838                return -EINVAL;
4839
4840        len = sizeof(struct sctp_prim);
4841
4842        if (copy_from_user(&prim, optval, len))
4843                return -EFAULT;
4844
4845        asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4846        if (!asoc)
4847                return -EINVAL;
4848
4849        if (!asoc->peer.primary_path)
4850                return -ENOTCONN;
4851
4852        memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4853                asoc->peer.primary_path->af_specific->sockaddr_len);
4854
4855        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4856                        (union sctp_addr *)&prim.ssp_addr);
4857
4858        if (put_user(len, optlen))
4859                return -EFAULT;
4860        if (copy_to_user(optval, &prim, len))
4861                return -EFAULT;
4862
4863        return 0;
4864}
4865
4866/*
4867 * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4868 *
4869 * Requests that the local endpoint set the specified Adaptation Layer
4870 * Indication parameter for all future INIT and INIT-ACK exchanges.
4871 */
4872static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4873                                  char __user *optval, int __user *optlen)
4874{
4875        struct sctp_setadaptation adaptation;
4876
4877        if (len < sizeof(struct sctp_setadaptation))
4878                return -EINVAL;
4879
4880        len = sizeof(struct sctp_setadaptation);
4881
4882        adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4883
4884        if (put_user(len, optlen))
4885                return -EFAULT;
4886        if (copy_to_user(optval, &adaptation, len))
4887                return -EFAULT;
4888
4889        return 0;
4890}
4891
4892/*
4893 *
4894 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4895 *
4896 *   Applications that wish to use the sendto() system call may wish to
4897 *   specify a default set of parameters that would normally be supplied
4898 *   through the inclusion of ancillary data.  This socket option allows
4899 *   such an application to set the default sctp_sndrcvinfo structure.
4900
4901
4902 *   The application that wishes to use this socket option simply passes
4903 *   in to this call the sctp_sndrcvinfo structure defined in Section
4904 *   5.2.2) The input parameters accepted by this call include
4905 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4906 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
4907 *   to this call if the caller is using the UDP model.
4908 *
4909 *   For getsockopt, it get the default sctp_sndrcvinfo structure.
4910 */
4911static int sctp_getsockopt_default_send_param(struct sock *sk,
4912                                        int len, char __user *optval,
4913                                        int __user *optlen)
4914{
4915        struct sctp_sndrcvinfo info;
4916        struct sctp_association *asoc;
4917        struct sctp_sock *sp = sctp_sk(sk);
4918
4919        if (len < sizeof(struct sctp_sndrcvinfo))
4920                return -EINVAL;
4921
4922        len = sizeof(struct sctp_sndrcvinfo);
4923
4924        if (copy_from_user(&info, optval, len))
4925                return -EFAULT;
4926
4927        asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4928        if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4929                return -EINVAL;
4930
4931        if (asoc) {
4932                info.sinfo_stream = asoc->default_stream;
4933                info.sinfo_flags = asoc->default_flags;
4934                info.sinfo_ppid = asoc->default_ppid;
4935                info.sinfo_context = asoc->default_context;
4936                info.sinfo_timetolive = asoc->default_timetolive;
4937        } else {
4938                info.sinfo_stream = sp->default_stream;
4939                info.sinfo_flags = sp->default_flags;
4940                info.sinfo_ppid = sp->default_ppid;
4941                info.sinfo_context = sp->default_context;
4942                info.sinfo_timetolive = sp->default_timetolive;
4943        }
4944
4945        if (put_user(len, optlen))
4946                return -EFAULT;
4947        if (copy_to_user(optval, &info, len))
4948                return -EFAULT;
4949
4950        return 0;
4951}
4952
4953/*
4954 *
4955 * 7.1.5 SCTP_NODELAY
4956 *
4957 * Turn on/off any Nagle-like algorithm.  This means that packets are
4958 * generally sent as soon as possible and no unnecessary delays are
4959 * introduced, at the cost of more packets in the network.  Expects an
4960 * integer boolean flag.
4961 */
4962
4963static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4964                                   char __user *optval, int __user *optlen)
4965{
4966        int val;
4967
4968        if (len < sizeof(int))
4969                return -EINVAL;
4970
4971        len = sizeof(int);
4972        val = (sctp_sk(sk)->nodelay == 1);
4973        if (put_user(len, optlen))
4974                return -EFAULT;
4975        if (copy_to_user(optval, &val, len))
4976                return -EFAULT;
4977        return 0;
4978}
4979
4980/*
4981 *
4982 * 7.1.1 SCTP_RTOINFO
4983 *
4984 * The protocol parameters used to initialize and bound retransmission
4985 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4986 * and modify these parameters.
4987 * All parameters are time values, in milliseconds.  A value of 0, when
4988 * modifying the parameters, indicates that the current value should not
4989 * be changed.
4990 *
4991 */
4992static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4993                                char __user *optval,
4994                                int __user *optlen) {
4995        struct sctp_rtoinfo rtoinfo;
4996        struct sctp_association *asoc;
4997
4998        if (len < sizeof (struct sctp_rtoinfo))
4999                return -EINVAL;
5000
5001        len = sizeof(struct sctp_rtoinfo);
5002
5003        if (copy_from_user(&rtoinfo, optval, len))
5004                return -EFAULT;
5005
5006        asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5007
5008        if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5009                return -EINVAL;
5010
5011        /* Values corresponding to the specific association. */
5012        if (asoc) {
5013                rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5014                rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5015                rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5016        } else {
5017                /* Values corresponding to the endpoint. */
5018                struct sctp_sock *sp = sctp_sk(sk);
5019
5020                rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5021                rtoinfo.srto_max = sp->rtoinfo.srto_max;
5022                rtoinfo.srto_min = sp->rtoinfo.srto_min;
5023        }
5024
5025        if (put_user(len, optlen))
5026                return -EFAULT;
5027
5028        if (copy_to_user(optval, &rtoinfo, len))
5029                return -EFAULT;
5030
5031        return 0;
5032}
5033
5034/*
5035 *
5036 * 7.1.2 SCTP_ASSOCINFO
5037 *
5038 * This option is used to tune the maximum retransmission attempts
5039 * of the association.
5040 * Returns an error if the new association retransmission value is
5041 * greater than the sum of the retransmission value  of the peer.
5042 * See [SCTP] for more information.
5043 *
5044 */
5045static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5046                                     char __user *optval,
5047                                     int __user *optlen)
5048{
5049
5050        struct sctp_assocparams assocparams;
5051        struct sctp_association *asoc;
5052        struct list_head *pos;
5053        int cnt = 0;
5054
5055        if (len < sizeof (struct sctp_assocparams))
5056                return -EINVAL;
5057
5058        len = sizeof(struct sctp_assocparams);
5059
5060        if (copy_from_user(&assocparams, optval, len))
5061                return -EFAULT;
5062
5063        asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5064
5065        if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5066                return -EINVAL;
5067
5068        /* Values correspoinding to the specific association */
5069        if (asoc) {
5070                assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5071                assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5072                assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5073                assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
5074                                                * 1000) +
5075                                                (asoc->cookie_life.tv_usec
5076                                                / 1000);
5077
5078                list_for_each(pos, &asoc->peer.transport_addr_list) {
5079                        cnt ++;
5080                }
5081
5082                assocparams.sasoc_number_peer_destinations = cnt;
5083        } else {
5084                /* Values corresponding to the endpoint */
5085                struct sctp_sock *sp = sctp_sk(sk);
5086
5087                assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5088                assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5089                assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5090                assocparams.sasoc_cookie_life =
5091                                        sp->assocparams.sasoc_cookie_life;
5092                assocparams.sasoc_number_peer_destinations =
5093                                        sp->assocparams.
5094                                        sasoc_number_peer_destinations;
5095        }
5096
5097        if (put_user(len, optlen))
5098                return -EFAULT;
5099
5100        if (copy_to_user(optval, &assocparams, len))
5101                return -EFAULT;
5102
5103        return 0;
5104}
5105
5106/*
5107 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5108 *
5109 * This socket option is a boolean flag which turns on or off mapped V4
5110 * addresses.  If this option is turned on and the socket is type
5111 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5112 * If this option is turned off, then no mapping will be done of V4
5113 * addresses and a user will receive both PF_INET6 and PF_INET type
5114 * addresses on the socket.
5115 */
5116static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5117                                    char __user *optval, int __user *optlen)
5118{
5119        int val;
5120        struct sctp_sock *sp = sctp_sk(sk);
5121
5122        if (len < sizeof(int))
5123                return -EINVAL;
5124
5125        len = sizeof(int);
5126        val = sp->v4mapped;
5127        if (put_user(len, optlen))
5128                return -EFAULT;
5129        if (copy_to_user(optval, &val, len))
5130                return -EFAULT;
5131
5132        return 0;
5133}
5134
5135/*
5136 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
5137 * (chapter and verse is quoted at sctp_setsockopt_context())
5138 */
5139static int sctp_getsockopt_context(struct sock *sk, int len,
5140                                   char __user *optval, int __user *optlen)
5141{
5142        struct sctp_assoc_value params;
5143        struct sctp_sock *sp;
5144        struct sctp_association *asoc;
5145
5146        if (len < sizeof(struct sctp_assoc_value))
5147                return -EINVAL;
5148
5149        len = sizeof(struct sctp_assoc_value);
5150
5151        if (copy_from_user(&params, optval, len))
5152                return -EFAULT;
5153
5154        sp = sctp_sk(sk);
5155
5156        if (params.assoc_id != 0) {
5157                asoc = sctp_id2assoc(sk, params.assoc_id);
5158                if (!asoc)
5159                        return -EINVAL;
5160                params.assoc_value = asoc->default_rcv_context;
5161        } else {
5162                params.assoc_value = sp->default_rcv_context;
5163        }
5164
5165        if (put_user(len, optlen))
5166                return -EFAULT;
5167        if (copy_to_user(optval, &params, len))
5168                return -EFAULT;
5169
5170        return 0;
5171}
5172
5173/*
5174 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5175 * This option will get or set the maximum size to put in any outgoing
5176 * SCTP DATA chunk.  If a message is larger than this size it will be
5177 * fragmented by SCTP into the specified size.  Note that the underlying
5178 * SCTP implementation may fragment into smaller sized chunks when the
5179 * PMTU of the underlying association is smaller than the value set by
5180 * the user.  The default value for this option is '0' which indicates
5181 * the user is NOT limiting fragmentation and only the PMTU will effect
5182 * SCTP's choice of DATA chunk size.  Note also that values set larger
5183 * than the maximum size of an IP datagram will effectively let SCTP
5184 * control fragmentation (i.e. the same as setting this option to 0).
5185 *
5186 * The following structure is used to access and modify this parameter:
5187 *
5188 * struct sctp_assoc_value {
5189 *   sctp_assoc_t assoc_id;
5190 *   uint32_t assoc_value;
5191 * };
5192 *
5193 * assoc_id:  This parameter is ignored for one-to-one style sockets.
5194 *    For one-to-many style sockets this parameter indicates which
5195 *    association the user is performing an action upon.  Note that if
5196 *    this field's value is zero then the endpoints default value is
5197 *    changed (effecting future associations only).
5198 * assoc_value:  This parameter specifies the maximum size in bytes.
5199 */
5200static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5201                                  char __user *optval, int __user *optlen)
5202{
5203        struct sctp_assoc_value params;
5204        struct sctp_association *asoc;
5205
5206        if (len == sizeof(int)) {
5207                pr_warn("Use of int in maxseg socket option deprecated\n");
5208                pr_warn("Use struct sctp_assoc_value instead\n");
5209                params.assoc_id = 0;
5210        } else if (len >= sizeof(struct sctp_assoc_value)) {
5211                len = sizeof(struct sctp_assoc_value);
5212                if (copy_from_user(&params, optval, sizeof(params)))
5213                        return -EFAULT;
5214        } else
5215                return -EINVAL;
5216
5217        asoc = sctp_id2assoc(sk, params.assoc_id);
5218        if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5219                return -EINVAL;
5220
5221        if (asoc)
5222                params.assoc_value = asoc->frag_point;
5223        else
5224                params.assoc_value = sctp_sk(sk)->user_frag;
5225
5226        if (put_user(len, optlen))
5227                return -EFAULT;
5228        if (len == sizeof(int)) {
5229                if (copy_to_user(optval, &params.assoc_value, len))
5230                        return -EFAULT;
5231        } else {
5232                if (copy_to_user(optval, &params, len))
5233                        return -EFAULT;
5234        }
5235
5236        return 0;
5237}
5238
5239/*
5240 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5241 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5242 */
5243static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5244                                               char __user *optval, int __user *optlen)
5245{
5246        int val;
5247
5248        if (len < sizeof(int))
5249                return -EINVAL;
5250
5251        len = sizeof(int);
5252
5253        val = sctp_sk(sk)->frag_interleave;
5254        if (put_user(len, optlen))
5255                return -EFAULT;
5256        if (copy_to_user(optval, &val, len))
5257                return -EFAULT;
5258
5259        return 0;
5260}
5261
5262/*
5263 * 7.1.25.  Set or Get the sctp partial delivery point
5264 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5265 */
5266static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5267                                                  char __user *optval,
5268                                                  int __user *optlen)
5269{
5270        u32 val;
5271
5272        if (len < sizeof(u32))
5273                return -EINVAL;
5274
5275        len = sizeof(u32);
5276
5277        val = sctp_sk(sk)->pd_point;
5278        if (put_user(len, optlen))
5279                return -EFAULT;
5280        if (copy_to_user(optval, &val, len))
5281                return -EFAULT;
5282
5283        return 0;
5284}
5285
5286/*
5287 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
5288 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5289 */
5290static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5291                                    char __user *optval,
5292                                    int __user *optlen)
5293{
5294        struct sctp_assoc_value params;
5295        struct sctp_sock *sp;
5296        struct sctp_association *asoc;
5297
5298        if (len == sizeof(int)) {
5299                pr_warn("Use of int in max_burst socket option deprecated\n");
5300                pr_warn("Use struct sctp_assoc_value instead\n");
5301                params.assoc_id = 0;
5302        } else if (len >= sizeof(struct sctp_assoc_value)) {
5303                len = sizeof(struct sctp_assoc_value);
5304                if (copy_from_user(&params, optval, len))
5305                        return -EFAULT;
5306        } else
5307                return -EINVAL;
5308
5309        sp = sctp_sk(sk);
5310
5311        if (params.assoc_id != 0) {
5312                asoc = sctp_id2assoc(sk, params.assoc_id);
5313                if (!asoc)
5314                        return -EINVAL;
5315                params.assoc_value = asoc->max_burst;
5316        } else
5317                params.assoc_value = sp->max_burst;
5318
5319        if (len == sizeof(int)) {
5320                if (copy_to_user(optval, &params.assoc_value, len))
5321                        return -EFAULT;
5322        } else {
5323                if (copy_to_user(optval, &params, len))
5324                        return -EFAULT;
5325        }
5326
5327        return 0;
5328
5329}
5330
5331static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5332                                    char __user *optval, int __user *optlen)
5333{
5334        struct net *net = sock_net(sk);
5335        struct sctp_hmacalgo  __user *p = (void __user *)optval;
5336        struct sctp_hmac_algo_param *hmacs;
5337        __u16 data_len = 0;
5338        u32 num_idents;
5339
5340        if (!net->sctp.auth_enable)
5341                return -EACCES;
5342
5343        hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5344        data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5345
5346        if (len < sizeof(struct sctp_hmacalgo) + data_len)
5347                return -EINVAL;
5348
5349        len = sizeof(struct sctp_hmacalgo) + data_len;
5350        num_idents = data_len / sizeof(u16);
5351
5352        if (put_user(len, optlen))
5353                return -EFAULT;
5354        if (put_user(num_idents, &p->shmac_num_idents))
5355                return -EFAULT;
5356        if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5357                return -EFAULT;
5358        return 0;
5359}
5360
5361static int sctp_getsockopt_active_key(struct sock *sk, int len,
5362                                    char __user *optval, int __user *optlen)
5363{
5364        struct net *net = sock_net(sk);
5365        struct sctp_authkeyid val;
5366        struct sctp_association *asoc;
5367
5368        if (!net->sctp.auth_enable)
5369                return -EACCES;
5370
5371        if (len < sizeof(struct sctp_authkeyid))
5372                return -EINVAL;
5373        if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5374                return -EFAULT;
5375
5376        asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5377        if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5378                return -EINVAL;
5379
5380        if (asoc)
5381                val.scact_keynumber = asoc->active_key_id;
5382        else
5383                val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5384
5385        len = sizeof(struct sctp_authkeyid);
5386        if (put_user(len, optlen))
5387                return -EFAULT;
5388        if (copy_to_user(optval, &val, len))
5389                return -EFAULT;
5390
5391        return 0;
5392}
5393
5394static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5395                                    char __user *optval, int __user *optlen)
5396{
5397        struct net *net = sock_net(sk);
5398        struct sctp_authchunks __user *p = (void __user *)optval;
5399        struct sctp_authchunks val;
5400        struct sctp_association *asoc;
5401        struct sctp_chunks_param *ch;
5402        u32    num_chunks = 0;
5403        char __user *to;
5404
5405        if (!net->sctp.auth_enable)
5406                return -EACCES;
5407
5408        if (len < sizeof(struct sctp_authchunks))
5409                return -EINVAL;
5410
5411        if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5412                return -EFAULT;
5413
5414        to = p->gauth_chunks;
5415        asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5416        if (!asoc)
5417                return -EINVAL;
5418
5419        ch = asoc->peer.peer_chunks;
5420        if (!ch)
5421                goto num;
5422
5423        /* See if the user provided enough room for all the data */
5424        num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5425        if (len < num_chunks)
5426                return -EINVAL;
5427
5428        if (copy_to_user(to, ch->chunks, num_chunks))
5429                return -EFAULT;
5430num:
5431        len = sizeof(struct sctp_authchunks) + num_chunks;
5432        if (put_user(len, optlen)) return -EFAULT;
5433        if (put_user(num_chunks, &p->gauth_number_of_chunks))
5434                return -EFAULT;
5435        return 0;
5436}
5437
5438static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5439                                    char __user *optval, int __user *optlen)
5440{
5441        struct net *net = sock_net(sk);
5442        struct sctp_authchunks __user *p = (void __user *)optval;
5443        struct sctp_authchunks val;
5444        struct sctp_association *asoc;
5445        struct sctp_chunks_param *ch;
5446        u32    num_chunks = 0;
5447        char __user *to;
5448
5449        if (!net->sctp.auth_enable)
5450                return -EACCES;
5451
5452        if (len < sizeof(struct sctp_authchunks))
5453                return -EINVAL;
5454
5455        if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5456                return -EFAULT;
5457
5458        to = p->gauth_chunks;
5459        asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5460        if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5461                return -EINVAL;
5462
5463        if (asoc)
5464                ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5465        else
5466                ch = sctp_sk(sk)->ep->auth_chunk_list;
5467
5468        if (!ch)
5469                goto num;
5470
5471        num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5472        if (len < sizeof(struct sctp_authchunks) + num_chunks)
5473                return -EINVAL;
5474
5475        if (copy_to_user(to, ch->chunks, num_chunks))
5476                return -EFAULT;
5477num:
5478        len = sizeof(struct sctp_authchunks) + num_chunks;
5479        if (put_user(len, optlen))
5480                return -EFAULT;
5481        if (put_user(num_chunks, &p->gauth_number_of_chunks))
5482                return -EFAULT;
5483
5484        return 0;
5485}
5486
5487/*
5488 * 8.2.5.  Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5489 * This option gets the current number of associations that are attached
5490 * to a one-to-many style socket.  The option value is an uint32_t.
5491 */
5492static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5493                                    char __user *optval, int __user *optlen)
5494{
5495        struct sctp_sock *sp = sctp_sk(sk);
5496        struct sctp_association *asoc;
5497        u32 val = 0;
5498
5499        if (sctp_style(sk, TCP))
5500                return -EOPNOTSUPP;
5501
5502        if (len < sizeof(u32))
5503                return -EINVAL;
5504
5505        len = sizeof(u32);
5506
5507        list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5508                val++;
5509        }
5510
5511        if (put_user(len, optlen))
5512                return -EFAULT;
5513        if (copy_to_user(optval, &val, len))
5514                return -EFAULT;
5515
5516        return 0;
5517}
5518
5519/*
5520 * 8.1.23 SCTP_AUTO_ASCONF
5521 * See the corresponding setsockopt entry as description
5522 */
5523static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5524                                   char __user *optval, int __user *optlen)
5525{
5526        int val = 0;
5527
5528        if (len < sizeof(int))
5529                return -EINVAL;
5530
5531        len = sizeof(int);
5532        if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5533                val = 1;
5534        if (put_user(len, optlen))
5535                return -EFAULT;
5536        if (copy_to_user(optval, &val, len))
5537                return -EFAULT;
5538        return 0;
5539}
5540
5541/*
5542 * 8.2.6. Get the Current Identifiers of Associations
5543 *        (SCTP_GET_ASSOC_ID_LIST)
5544 *
5545 * This option gets the current list of SCTP association identifiers of
5546 * the SCTP associations handled by a one-to-many style socket.
5547 */
5548static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5549                                    char __user *optval, int __user *optlen)
5550{
5551        struct sctp_sock *sp = sctp_sk(sk);
5552        struct sctp_association *asoc;
5553        struct sctp_assoc_ids *ids;
5554        u32 num = 0;
5555
5556        if (sctp_style(sk, TCP))
5557                return -EOPNOTSUPP;
5558
5559        if (len < sizeof(struct sctp_assoc_ids))
5560                return -EINVAL;
5561
5562        list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5563                num++;
5564        }
5565
5566        if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5567                return -EINVAL;
5568
5569        len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5570
5571        ids = kmalloc(len, GFP_KERNEL);
5572        if (unlikely(!ids))
5573                return -ENOMEM;
5574
5575        ids->gaids_number_of_ids = num;
5576        num = 0;
5577