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);
 113
 114extern struct kmem_cache *sctp_bucket_cachep;
 115extern long sysctl_sctp_mem[3];
 116extern int sysctl_sctp_rmem[3];
 117extern int sysctl_sctp_wmem[3];
 118
 119static int sctp_memory_pressure;
 120static atomic_long_t sctp_memory_allocated;
 121struct percpu_counter sctp_sockets_allocated;
 122
 123static void sctp_enter_memory_pressure(struct sock *sk)
 124{
 125        sctp_memory_pressure = 1;
 126}
 127
 128
 129/* Get the sndbuf space available at the time on the association.  */
 130static inline int sctp_wspace(struct sctp_association *asoc)
 131{
 132        int amt;
 133
 134        if (asoc->ep->sndbuf_policy)
 135                amt = asoc->sndbuf_used;
 136        else
 137                amt = sk_wmem_alloc_get(asoc->base.sk);
 138
 139        if (amt >= asoc->base.sk->sk_sndbuf) {
 140                if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
 141                        amt = 0;
 142                else {
 143                        amt = sk_stream_wspace(asoc->base.sk);
 144                        if (amt < 0)
 145                                amt = 0;
 146                }
 147        } else {
 148                amt = asoc->base.sk->sk_sndbuf - amt;
 149        }
 150        return amt;
 151}
 152
 153/* Increment the used sndbuf space count of the corresponding association by
 154 * the size of the outgoing data chunk.
 155 * Also, set the skb destructor for sndbuf accounting later.
 156 *
 157 * Since it is always 1-1 between chunk and skb, and also a new skb is always
 158 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
 159 * destructor in the data chunk skb for the purpose of the sndbuf space
 160 * tracking.
 161 */
 162static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
 163{
 164        struct sctp_association *asoc = chunk->asoc;
 165        struct sock *sk = asoc->base.sk;
 166
 167        /* The sndbuf space is tracked per association.  */
 168        sctp_association_hold(asoc);
 169
 170        skb_set_owner_w(chunk->skb, sk);
 171
 172        chunk->skb->destructor = sctp_wfree;
 173        /* Save the chunk pointer in skb for sctp_wfree to use later.  */
 174        *((struct sctp_chunk **)(chunk->skb->cb)) = chunk;
 175
 176        asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
 177                                sizeof(struct sk_buff) +
 178                                sizeof(struct sctp_chunk);
 179
 180        atomic_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
 181        sk->sk_wmem_queued += chunk->skb->truesize;
 182        sk_mem_charge(sk, chunk->skb->truesize);
 183}
 184
 185/* Verify that this is a valid address. */
 186static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
 187                                   int len)
 188{
 189        struct sctp_af *af;
 190
 191        /* Verify basic sockaddr. */
 192        af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
 193        if (!af)
 194                return -EINVAL;
 195
 196        /* Is this a valid SCTP address?  */
 197        if (!af->addr_valid(addr, sctp_sk(sk), NULL))
 198                return -EINVAL;
 199
 200        if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
 201                return -EINVAL;
 202
 203        return 0;
 204}
 205
 206/* Look up the association by its id.  If this is not a UDP-style
 207 * socket, the ID field is always ignored.
 208 */
 209struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
 210{
 211        struct sctp_association *asoc = NULL;
 212
 213        /* If this is not a UDP-style socket, assoc id should be ignored. */
 214        if (!sctp_style(sk, UDP)) {
 215                /* Return NULL if the socket state is not ESTABLISHED. It
 216                 * could be a TCP-style listening socket or a socket which
 217                 * hasn't yet called connect() to establish an association.
 218                 */
 219                if (!sctp_sstate(sk, ESTABLISHED))
 220                        return NULL;
 221
 222                /* Get the first and the only association from the list. */
 223                if (!list_empty(&sctp_sk(sk)->ep->asocs))
 224                        asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
 225                                          struct sctp_association, asocs);
 226                return asoc;
 227        }
 228
 229        /* Otherwise this is a UDP-style socket. */
 230        if (!id || (id == (sctp_assoc_t)-1))
 231                return NULL;
 232
 233        spin_lock_bh(&sctp_assocs_id_lock);
 234        asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
 235        spin_unlock_bh(&sctp_assocs_id_lock);
 236
 237        if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
 238                return NULL;
 239
 240        return asoc;
 241}
 242
 243/* Look up the transport from an address and an assoc id. If both address and
 244 * id are specified, the associations matching the address and the id should be
 245 * the same.
 246 */
 247static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
 248                                              struct sockaddr_storage *addr,
 249                                              sctp_assoc_t id)
 250{
 251        struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
 252        struct sctp_transport *transport;
 253        union sctp_addr *laddr = (union sctp_addr *)addr;
 254
 255        addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
 256                                               laddr,
 257                                               &transport);
 258
 259        if (!addr_asoc)
 260                return NULL;
 261
 262        id_asoc = sctp_id2assoc(sk, id);
 263        if (id_asoc && (id_asoc != addr_asoc))
 264                return NULL;
 265
 266        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
 267                                                (union sctp_addr *)addr);
 268
 269        return transport;
 270}
 271
 272/* API 3.1.2 bind() - UDP Style Syntax
 273 * The syntax of bind() is,
 274 *
 275 *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
 276 *
 277 *   sd      - the socket descriptor returned by socket().
 278 *   addr    - the address structure (struct sockaddr_in or struct
 279 *             sockaddr_in6 [RFC 2553]),
 280 *   addr_len - the size of the address structure.
 281 */
 282SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
 283{
 284        int retval = 0;
 285
 286        sctp_lock_sock(sk);
 287
 288        SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
 289                          sk, addr, addr_len);
 290
 291        /* Disallow binding twice. */
 292        if (!sctp_sk(sk)->ep->base.bind_addr.port)
 293                retval = sctp_do_bind(sk, (union sctp_addr *)addr,
 294                                      addr_len);
 295        else
 296                retval = -EINVAL;
 297
 298        sctp_release_sock(sk);
 299
 300        return retval;
 301}
 302
 303static long sctp_get_port_local(struct sock *, union sctp_addr *);
 304
 305/* Verify this is a valid sockaddr. */
 306static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
 307                                        union sctp_addr *addr, int len)
 308{
 309        struct sctp_af *af;
 310
 311        /* Check minimum size.  */
 312        if (len < sizeof (struct sockaddr))
 313                return NULL;
 314
 315        /* V4 mapped address are really of AF_INET family */
 316        if (addr->sa.sa_family == AF_INET6 &&
 317            ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
 318                if (!opt->pf->af_supported(AF_INET, opt))
 319                        return NULL;
 320        } else {
 321                /* Does this PF support this AF? */
 322                if (!opt->pf->af_supported(addr->sa.sa_family, opt))
 323                        return NULL;
 324        }
 325
 326        /* If we get this far, af is valid. */
 327        af = sctp_get_af_specific(addr->sa.sa_family);
 328
 329        if (len < af->sockaddr_len)
 330                return NULL;
 331
 332        return af;
 333}
 334
 335/* Bind a local address either to an endpoint or to an association.  */
 336SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
 337{
 338        struct net *net = sock_net(sk);
 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 &&
 383            !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 384                return -EACCES;
 385
 386        /* See if the address matches any of the addresses we may have
 387         * already bound before checking against other endpoints.
 388         */
 389        if (sctp_bind_addr_match(bp, addr, sp))
 390                return -EINVAL;
 391
 392        /* Make sure we are allowed to bind here.
 393         * The function sctp_get_port_local() does duplicate address
 394         * detection.
 395         */
 396        addr->v4.sin_port = htons(snum);
 397        if ((ret = sctp_get_port_local(sk, addr))) {
 398                return -EADDRINUSE;
 399        }
 400
 401        /* Refresh ephemeral port.  */
 402        if (!bp->port)
 403                bp->port = inet_sk(sk)->inet_num;
 404
 405        /* Add the address to the bind address list.
 406         * Use GFP_ATOMIC since BHs will be disabled.
 407         */
 408        ret = sctp_add_bind_addr(bp, addr, SCTP_ADDR_SRC, GFP_ATOMIC);
 409
 410        /* Copy back into socket for getsockname() use. */
 411        if (!ret) {
 412                inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
 413                af->to_sk_saddr(addr, sk);
 414        }
 415
 416        return ret;
 417}
 418
 419 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
 420 *
 421 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
 422 * at any one time.  If a sender, after sending an ASCONF chunk, decides
 423 * it needs to transfer another ASCONF Chunk, it MUST wait until the
 424 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
 425 * subsequent ASCONF. Note this restriction binds each side, so at any
 426 * time two ASCONF may be in-transit on any given association (one sent
 427 * from each endpoint).
 428 */
 429static int sctp_send_asconf(struct sctp_association *asoc,
 430                            struct sctp_chunk *chunk)
 431{
 432        struct net      *net = sock_net(asoc->base.sk);
 433        int             retval = 0;
 434
 435        /* If there is an outstanding ASCONF chunk, queue it for later
 436         * transmission.
 437         */
 438        if (asoc->addip_last_asconf) {
 439                list_add_tail(&chunk->list, &asoc->addip_chunk_list);
 440                goto out;
 441        }
 442
 443        /* Hold the chunk until an ASCONF_ACK is received. */
 444        sctp_chunk_hold(chunk);
 445        retval = sctp_primitive_ASCONF(net, asoc, chunk);
 446        if (retval)
 447                sctp_chunk_free(chunk);
 448        else
 449                asoc->addip_last_asconf = chunk;
 450
 451out:
 452        return retval;
 453}
 454
 455/* Add a list of addresses as bind addresses to local endpoint or
 456 * association.
 457 *
 458 * Basically run through each address specified in the addrs/addrcnt
 459 * array/length pair, determine if it is IPv6 or IPv4 and call
 460 * sctp_do_bind() on it.
 461 *
 462 * If any of them fails, then the operation will be reversed and the
 463 * ones that were added will be removed.
 464 *
 465 * Only sctp_setsockopt_bindx() is supposed to call this function.
 466 */
 467static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
 468{
 469        int cnt;
 470        int retval = 0;
 471        void *addr_buf;
 472        struct sockaddr *sa_addr;
 473        struct sctp_af *af;
 474
 475        SCTP_DEBUG_PRINTK("sctp_bindx_add (sk: %p, addrs: %p, addrcnt: %d)\n",
 476                          sk, addrs, addrcnt);
 477
 478        addr_buf = addrs;
 479        for (cnt = 0; cnt < addrcnt; cnt++) {
 480                /* The list may contain either IPv4 or IPv6 address;
 481                 * determine the address length for walking thru the list.
 482                 */
 483                sa_addr = addr_buf;
 484                af = sctp_get_af_specific(sa_addr->sa_family);
 485                if (!af) {
 486                        retval = -EINVAL;
 487                        goto err_bindx_add;
 488                }
 489
 490                retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
 491                                      af->sockaddr_len);
 492
 493                addr_buf += af->sockaddr_len;
 494
 495err_bindx_add:
 496                if (retval < 0) {
 497                        /* Failed. Cleanup the ones that have been added */
 498                        if (cnt > 0)
 499                                sctp_bindx_rem(sk, addrs, cnt);
 500                        return retval;
 501                }
 502        }
 503
 504        return retval;
 505}
 506
 507/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
 508 * associations that are part of the endpoint indicating that a list of local
 509 * addresses are added to the endpoint.
 510 *
 511 * If any of the addresses is already in the bind address list of the
 512 * association, we do not send the chunk for that association.  But it will not
 513 * affect other associations.
 514 *
 515 * Only sctp_setsockopt_bindx() is supposed to call this function.
 516 */
 517static int sctp_send_asconf_add_ip(struct sock          *sk,
 518                                   struct sockaddr      *addrs,
 519                                   int                  addrcnt)
 520{
 521        struct net *net = sock_net(sk);
 522        struct sctp_sock                *sp;
 523        struct sctp_endpoint            *ep;
 524        struct sctp_association         *asoc;
 525        struct sctp_bind_addr           *bp;
 526        struct sctp_chunk               *chunk;
 527        struct sctp_sockaddr_entry      *laddr;
 528        union sctp_addr                 *addr;
 529        union sctp_addr                 saveaddr;
 530        void                            *addr_buf;
 531        struct sctp_af                  *af;
 532        struct list_head                *p;
 533        int                             i;
 534        int                             retval = 0;
 535
 536        if (!net->sctp.addip_enable)
 537                return retval;
 538
 539        sp = sctp_sk(sk);
 540        ep = sp->ep;
 541
 542        SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
 543                          __func__, sk, addrs, addrcnt);
 544
 545        list_for_each_entry(asoc, &ep->asocs, asocs) {
 546
 547                if (!asoc->peer.asconf_capable)
 548                        continue;
 549
 550                if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
 551                        continue;
 552
 553                if (!sctp_state(asoc, ESTABLISHED))
 554                        continue;
 555
 556                /* Check if any address in the packed array of addresses is
 557                 * in the bind address list of the association. If so,
 558                 * do not send the asconf chunk to its peer, but continue with
 559                 * other associations.
 560                 */
 561                addr_buf = addrs;
 562                for (i = 0; i < addrcnt; i++) {
 563                        addr = addr_buf;
 564                        af = sctp_get_af_specific(addr->v4.sin_family);
 565                        if (!af) {
 566                                retval = -EINVAL;
 567                                goto out;
 568                        }
 569
 570                        if (sctp_assoc_lookup_laddr(asoc, addr))
 571                                break;
 572
 573                        addr_buf += af->sockaddr_len;
 574                }
 575                if (i < addrcnt)
 576                        continue;
 577
 578                /* Use the first valid address in bind addr list of
 579                 * association as Address Parameter of ASCONF CHUNK.
 580                 */
 581                bp = &asoc->base.bind_addr;
 582                p = bp->address_list.next;
 583                laddr = list_entry(p, struct sctp_sockaddr_entry, list);
 584                chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
 585                                                   addrcnt, SCTP_PARAM_ADD_IP);
 586                if (!chunk) {
 587                        retval = -ENOMEM;
 588                        goto out;
 589                }
 590
 591                /* Add the new addresses to the bind address list with
 592                 * use_as_src set to 0.
 593                 */
 594                addr_buf = addrs;
 595                for (i = 0; i < addrcnt; i++) {
 596                        addr = addr_buf;
 597                        af = sctp_get_af_specific(addr->v4.sin_family);
 598                        memcpy(&saveaddr, addr, af->sockaddr_len);
 599                        retval = sctp_add_bind_addr(bp, &saveaddr,
 600                                                    SCTP_ADDR_NEW, GFP_ATOMIC);
 601                        addr_buf += af->sockaddr_len;
 602                }
 603                if (asoc->src_out_of_asoc_ok) {
 604                        struct sctp_transport *trans;
 605
 606                        list_for_each_entry(trans,
 607                            &asoc->peer.transport_addr_list, transports) {
 608                                /* Clear the source and route cache */
 609                                dst_release(trans->dst);
 610                                trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
 611                                    2*asoc->pathmtu, 4380));
 612                                trans->ssthresh = asoc->peer.i.a_rwnd;
 613                                trans->rto = asoc->rto_initial;
 614                                sctp_max_rto(asoc, trans);
 615                                trans->rtt = trans->srtt = trans->rttvar = 0;
 616                                sctp_transport_route(trans, NULL,
 617                                    sctp_sk(asoc->base.sk));
 618                        }
 619                }
 620                retval = sctp_send_asconf(asoc, chunk);
 621        }
 622
 623out:
 624        return retval;
 625}
 626
 627/* Remove a list of addresses from bind addresses list.  Do not remove the
 628 * last address.
 629 *
 630 * Basically run through each address specified in the addrs/addrcnt
 631 * array/length pair, determine if it is IPv6 or IPv4 and call
 632 * sctp_del_bind() on it.
 633 *
 634 * If any of them fails, then the operation will be reversed and the
 635 * ones that were removed will be added back.
 636 *
 637 * At least one address has to be left; if only one address is
 638 * available, the operation will return -EBUSY.
 639 *
 640 * Only sctp_setsockopt_bindx() is supposed to call this function.
 641 */
 642static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
 643{
 644        struct sctp_sock *sp = sctp_sk(sk);
 645        struct sctp_endpoint *ep = sp->ep;
 646        int cnt;
 647        struct sctp_bind_addr *bp = &ep->base.bind_addr;
 648        int retval = 0;
 649        void *addr_buf;
 650        union sctp_addr *sa_addr;
 651        struct sctp_af *af;
 652
 653        SCTP_DEBUG_PRINTK("sctp_bindx_rem (sk: %p, addrs: %p, addrcnt: %d)\n",
 654                          sk, addrs, addrcnt);
 655
 656        addr_buf = addrs;
 657        for (cnt = 0; cnt < addrcnt; cnt++) {
 658                /* If the bind address list is empty or if there is only one
 659                 * bind address, there is nothing more to be removed (we need
 660                 * at least one address here).
 661                 */
 662                if (list_empty(&bp->address_list) ||
 663                    (sctp_list_single_entry(&bp->address_list))) {
 664                        retval = -EBUSY;
 665                        goto err_bindx_rem;
 666                }
 667
 668                sa_addr = addr_buf;
 669                af = sctp_get_af_specific(sa_addr->sa.sa_family);
 670                if (!af) {
 671                        retval = -EINVAL;
 672                        goto err_bindx_rem;
 673                }
 674
 675                if (!af->addr_valid(sa_addr, sp, NULL)) {
 676                        retval = -EADDRNOTAVAIL;
 677                        goto err_bindx_rem;
 678                }
 679
 680                if (sa_addr->v4.sin_port &&
 681                    sa_addr->v4.sin_port != htons(bp->port)) {
 682                        retval = -EINVAL;
 683                        goto err_bindx_rem;
 684                }
 685
 686                if (!sa_addr->v4.sin_port)
 687                        sa_addr->v4.sin_port = htons(bp->port);
 688
 689                /* FIXME - There is probably a need to check if sk->sk_saddr and
 690                 * sk->sk_rcv_addr are currently set to one of the addresses to
 691                 * be removed. This is something which needs to be looked into
 692                 * when we are fixing the outstanding issues with multi-homing
 693                 * socket routing and failover schemes. Refer to comments in
 694                 * sctp_do_bind(). -daisy
 695                 */
 696                retval = sctp_del_bind_addr(bp, sa_addr);
 697
 698                addr_buf += af->sockaddr_len;
 699err_bindx_rem:
 700                if (retval < 0) {
 701                        /* Failed. Add the ones that has been removed back */
 702                        if (cnt > 0)
 703                                sctp_bindx_add(sk, addrs, cnt);
 704                        return retval;
 705                }
 706        }
 707
 708        return retval;
 709}
 710
 711/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
 712 * the associations that are part of the endpoint indicating that a list of
 713 * local addresses are removed from the endpoint.
 714 *
 715 * If any of the addresses is already in the bind address list of the
 716 * association, we do not send the chunk for that association.  But it will not
 717 * affect other associations.
 718 *
 719 * Only sctp_setsockopt_bindx() is supposed to call this function.
 720 */
 721static int sctp_send_asconf_del_ip(struct sock          *sk,
 722                                   struct sockaddr      *addrs,
 723                                   int                  addrcnt)
 724{
 725        struct net *net = sock_net(sk);
 726        struct sctp_sock        *sp;
 727        struct sctp_endpoint    *ep;
 728        struct sctp_association *asoc;
 729        struct sctp_transport   *transport;
 730        struct sctp_bind_addr   *bp;
 731        struct sctp_chunk       *chunk;
 732        union sctp_addr         *laddr;
 733        void                    *addr_buf;
 734        struct sctp_af          *af;
 735        struct sctp_sockaddr_entry *saddr;
 736        int                     i;
 737        int                     retval = 0;
 738        int                     stored = 0;
 739
 740        chunk = NULL;
 741        if (!net->sctp.addip_enable)
 742                return retval;
 743
 744        sp = sctp_sk(sk);
 745        ep = sp->ep;
 746
 747        SCTP_DEBUG_PRINTK("%s: (sk: %p, addrs: %p, addrcnt: %d)\n",
 748                          __func__, sk, addrs, addrcnt);
 749
 750        list_for_each_entry(asoc, &ep->asocs, asocs) {
 751
 752                if (!asoc->peer.asconf_capable)
 753                        continue;
 754
 755                if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
 756                        continue;
 757
 758                if (!sctp_state(asoc, ESTABLISHED))
 759                        continue;
 760
 761                /* Check if any address in the packed array of addresses is
 762                 * not present in the bind address list of the association.
 763                 * If so, do not send the asconf chunk to its peer, but
 764                 * continue with other associations.
 765                 */
 766                addr_buf = addrs;
 767                for (i = 0; i < addrcnt; i++) {
 768                        laddr = addr_buf;
 769                        af = sctp_get_af_specific(laddr->v4.sin_family);
 770                        if (!af) {
 771                                retval = -EINVAL;
 772                                goto out;
 773                        }
 774
 775                        if (!sctp_assoc_lookup_laddr(asoc, laddr))
 776                                break;
 777
 778                        addr_buf += af->sockaddr_len;
 779                }
 780                if (i < addrcnt)
 781                        continue;
 782
 783                /* Find one address in the association's bind address list
 784                 * that is not in the packed array of addresses. This is to
 785                 * make sure that we do not delete all the addresses in the
 786                 * association.
 787                 */
 788                bp = &asoc->base.bind_addr;
 789                laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
 790                                               addrcnt, sp);
 791                if ((laddr == NULL) && (addrcnt == 1)) {
 792                        if (asoc->asconf_addr_del_pending)
 793                                continue;
 794                        asoc->asconf_addr_del_pending =
 795                            kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
 796                        if (asoc->asconf_addr_del_pending == NULL) {
 797                                retval = -ENOMEM;
 798                                goto out;
 799                        }
 800                        asoc->asconf_addr_del_pending->sa.sa_family =
 801                                    addrs->sa_family;
 802                        asoc->asconf_addr_del_pending->v4.sin_port =
 803                                    htons(bp->port);
 804                        if (addrs->sa_family == AF_INET) {
 805                                struct sockaddr_in *sin;
 806
 807                                sin = (struct sockaddr_in *)addrs;
 808                                asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
 809                        } else if (addrs->sa_family == AF_INET6) {
 810                                struct sockaddr_in6 *sin6;
 811
 812                                sin6 = (struct sockaddr_in6 *)addrs;
 813                                asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
 814                        }
 815                        SCTP_DEBUG_PRINTK_IPADDR("send_asconf_del_ip: keep the last address asoc: %p ",
 816                            " at %p\n", asoc, asoc->asconf_addr_del_pending,
 817                            asoc->asconf_addr_del_pending);
 818                        asoc->src_out_of_asoc_ok = 1;
 819                        stored = 1;
 820                        goto skip_mkasconf;
 821                }
 822
 823                /* We do not need RCU protection throughout this loop
 824                 * because this is done under a socket lock from the
 825                 * setsockopt call.
 826                 */
 827                chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
 828                                                   SCTP_PARAM_DEL_IP);
 829                if (!chunk) {
 830                        retval = -ENOMEM;
 831                        goto out;
 832                }
 833
 834skip_mkasconf:
 835                /* Reset use_as_src flag for the addresses in the bind address
 836                 * list that are to be deleted.
 837                 */
 838                addr_buf = addrs;
 839                for (i = 0; i < addrcnt; i++) {
 840                        laddr = addr_buf;
 841                        af = sctp_get_af_specific(laddr->v4.sin_family);
 842                        list_for_each_entry(saddr, &bp->address_list, list) {
 843                                if (sctp_cmp_addr_exact(&saddr->a, laddr))
 844                                        saddr->state = SCTP_ADDR_DEL;
 845                        }
 846                        addr_buf += af->sockaddr_len;
 847                }
 848
 849                /* Update the route and saddr entries for all the transports
 850                 * as some of the addresses in the bind address list are
 851                 * about to be deleted and cannot be used as source addresses.
 852                 */
 853                list_for_each_entry(transport, &asoc->peer.transport_addr_list,
 854                                        transports) {
 855                        dst_release(transport->dst);
 856                        sctp_transport_route(transport, NULL,
 857                                             sctp_sk(asoc->base.sk));
 858                }
 859
 860                if (stored)
 861                        /* We don't need to transmit ASCONF */
 862                        continue;
 863                retval = sctp_send_asconf(asoc, chunk);
 864        }
 865out:
 866        return retval;
 867}
 868
 869/* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
 870int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
 871{
 872        struct sock *sk = sctp_opt2sk(sp);
 873        union sctp_addr *addr;
 874        struct sctp_af *af;
 875
 876        /* It is safe to write port space in caller. */
 877        addr = &addrw->a;
 878        addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
 879        af = sctp_get_af_specific(addr->sa.sa_family);
 880        if (!af)
 881                return -EINVAL;
 882        if (sctp_verify_addr(sk, addr, af->sockaddr_len))
 883                return -EINVAL;
 884
 885        if (addrw->state == SCTP_ADDR_NEW)
 886                return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
 887        else
 888                return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
 889}
 890
 891/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
 892 *
 893 * API 8.1
 894 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
 895 *                int flags);
 896 *
 897 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
 898 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
 899 * or IPv6 addresses.
 900 *
 901 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
 902 * Section 3.1.2 for this usage.
 903 *
 904 * addrs is a pointer to an array of one or more socket addresses. Each
 905 * address is contained in its appropriate structure (i.e. struct
 906 * sockaddr_in or struct sockaddr_in6) the family of the address type
 907 * must be used to distinguish the address length (note that this
 908 * representation is termed a "packed array" of addresses). The caller
 909 * specifies the number of addresses in the array with addrcnt.
 910 *
 911 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
 912 * -1, and sets errno to the appropriate error code.
 913 *
 914 * For SCTP, the port given in each socket address must be the same, or
 915 * sctp_bindx() will fail, setting errno to EINVAL.
 916 *
 917 * The flags parameter is formed from the bitwise OR of zero or more of
 918 * the following currently defined flags:
 919 *
 920 * SCTP_BINDX_ADD_ADDR
 921 *
 922 * SCTP_BINDX_REM_ADDR
 923 *
 924 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
 925 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
 926 * addresses from the association. The two flags are mutually exclusive;
 927 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
 928 * not remove all addresses from an association; sctp_bindx() will
 929 * reject such an attempt with EINVAL.
 930 *
 931 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
 932 * additional addresses with an endpoint after calling bind().  Or use
 933 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
 934 * socket is associated with so that no new association accepted will be
 935 * associated with those addresses. If the endpoint supports dynamic
 936 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
 937 * endpoint to send the appropriate message to the peer to change the
 938 * peers address lists.
 939 *
 940 * Adding and removing addresses from a connected association is
 941 * optional functionality. Implementations that do not support this
 942 * functionality should return EOPNOTSUPP.
 943 *
 944 * Basically do nothing but copying the addresses from user to kernel
 945 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
 946 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
 947 * from userspace.
 948 *
 949 * We don't use copy_from_user() for optimization: we first do the
 950 * sanity checks (buffer size -fast- and access check-healthy
 951 * pointer); if all of those succeed, then we can alloc the memory
 952 * (expensive operation) needed to copy the data to kernel. Then we do
 953 * the copying without checking the user space area
 954 * (__copy_from_user()).
 955 *
 956 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 957 * it.
 958 *
 959 * sk        The sk of the socket
 960 * addrs     The pointer to the addresses in user land
 961 * addrssize Size of the addrs buffer
 962 * op        Operation to perform (add or remove, see the flags of
 963 *           sctp_bindx)
 964 *
 965 * Returns 0 if ok, <0 errno code on error.
 966 */
 967SCTP_STATIC int sctp_setsockopt_bindx(struct sock* sk,
 968                                      struct sockaddr __user *addrs,
 969                                      int addrs_size, int op)
 970{
 971        struct sockaddr *kaddrs;
 972        int err;
 973        int addrcnt = 0;
 974        int walk_size = 0;
 975        struct sockaddr *sa_addr;
 976        void *addr_buf;
 977        struct sctp_af *af;
 978
 979        SCTP_DEBUG_PRINTK("sctp_setsockopt_bindx: sk %p addrs %p"
 980                          " addrs_size %d opt %d\n", sk, addrs, addrs_size, op);
 981
 982        if (unlikely(addrs_size <= 0))
 983                return -EINVAL;
 984
 985        /* Check the user passed a healthy pointer.  */
 986        if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
 987                return -EFAULT;
 988
 989        /* Alloc space for the address array in kernel memory.  */
 990        kaddrs = kmalloc(addrs_size, GFP_KERNEL);
 991        if (unlikely(!kaddrs))
 992                return -ENOMEM;
 993
 994        if (__copy_from_user(kaddrs, addrs, addrs_size)) {
 995                kfree(kaddrs);
 996                return -EFAULT;
 997        }
 998
 999        /* Walk through the addrs buffer and count the number of addresses. */
1000        addr_buf = kaddrs;
1001        while (walk_size < addrs_size) {
1002                if (walk_size + sizeof(sa_family_t) > addrs_size) {
1003                        kfree(kaddrs);
1004                        return -EINVAL;
1005                }
1006
1007                sa_addr = addr_buf;
1008                af = sctp_get_af_specific(sa_addr->sa_family);
1009
1010                /* If the address family is not supported or if this address
1011                 * causes the address buffer to overflow return EINVAL.
1012                 */
1013                if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1014                        kfree(kaddrs);
1015                        return -EINVAL;
1016                }
1017                addrcnt++;
1018                addr_buf += af->sockaddr_len;
1019                walk_size += af->sockaddr_len;
1020        }
1021
1022        /* Do the work. */
1023        switch (op) {
1024        case SCTP_BINDX_ADD_ADDR:
1025                err = sctp_bindx_add(sk, kaddrs, addrcnt);
1026                if (err)
1027                        goto out;
1028                err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
1029                break;
1030
1031        case SCTP_BINDX_REM_ADDR:
1032                err = sctp_bindx_rem(sk, kaddrs, addrcnt);
1033                if (err)
1034                        goto out;
1035                err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
1036                break;
1037
1038        default:
1039                err = -EINVAL;
1040                break;
1041        }
1042
1043out:
1044        kfree(kaddrs);
1045
1046        return err;
1047}
1048
1049/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1050 *
1051 * Common routine for handling connect() and sctp_connectx().
1052 * Connect will come in with just a single address.
1053 */
1054static int __sctp_connect(struct sock* sk,
1055                          struct sockaddr *kaddrs,
1056                          int addrs_size,
1057                          sctp_assoc_t *assoc_id)
1058{
1059        struct net *net = sock_net(sk);
1060        struct sctp_sock *sp;
1061        struct sctp_endpoint *ep;
1062        struct sctp_association *asoc = NULL;
1063        struct sctp_association *asoc2;
1064        struct sctp_transport *transport;
1065        union sctp_addr to;
1066        struct sctp_af *af;
1067        sctp_scope_t scope;
1068        long timeo;
1069        int err = 0;
1070        int addrcnt = 0;
1071        int walk_size = 0;
1072        union sctp_addr *sa_addr = NULL;
1073        void *addr_buf;
1074        unsigned short port;
1075        unsigned int f_flags = 0;
1076
1077        sp = sctp_sk(sk);
1078        ep = sp->ep;
1079
1080        /* connect() cannot be done on a socket that is already in ESTABLISHED
1081         * state - UDP-style peeled off socket or a TCP-style socket that
1082         * is already connected.
1083         * It cannot be done even on a TCP-style listening socket.
1084         */
1085        if (sctp_sstate(sk, ESTABLISHED) ||
1086            (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
1087                err = -EISCONN;
1088                goto out_free;
1089        }
1090
1091        /* Walk through the addrs buffer and count the number of addresses. */
1092        addr_buf = kaddrs;
1093        while (walk_size < addrs_size) {
1094                if (walk_size + sizeof(sa_family_t) > addrs_size) {
1095                        err = -EINVAL;
1096                        goto out_free;
1097                }
1098
1099                sa_addr = addr_buf;
1100                af = sctp_get_af_specific(sa_addr->sa.sa_family);
1101
1102                /* If the address family is not supported or if this address
1103                 * causes the address buffer to overflow return EINVAL.
1104                 */
1105                if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1106                        err = -EINVAL;
1107                        goto out_free;
1108                }
1109
1110                port = ntohs(sa_addr->v4.sin_port);
1111
1112                /* Save current address so we can work with it */
1113                memcpy(&to, sa_addr, af->sockaddr_len);
1114
1115                err = sctp_verify_addr(sk, &to, af->sockaddr_len);
1116                if (err)
1117                        goto out_free;
1118
1119                /* Make sure the destination port is correctly set
1120                 * in all addresses.
1121                 */
1122                if (asoc && asoc->peer.port && asoc->peer.port != port)
1123                        goto out_free;
1124
1125
1126                /* Check if there already is a matching association on the
1127                 * endpoint (other than the one created here).
1128                 */
1129                asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1130                if (asoc2 && asoc2 != asoc) {
1131                        if (asoc2->state >= SCTP_STATE_ESTABLISHED)
1132                                err = -EISCONN;
1133                        else
1134                                err = -EALREADY;
1135                        goto out_free;
1136                }
1137
1138                /* If we could not find a matching association on the endpoint,
1139                 * make sure that there is no peeled-off association matching
1140                 * the peer address even on another socket.
1141                 */
1142                if (sctp_endpoint_is_peeled_off(ep, &to)) {
1143                        err = -EADDRNOTAVAIL;
1144                        goto out_free;
1145                }
1146
1147                if (!asoc) {
1148                        /* If a bind() or sctp_bindx() is not called prior to
1149                         * an sctp_connectx() call, the system picks an
1150                         * ephemeral port and will choose an address set
1151                         * equivalent to binding with a wildcard address.
1152                         */
1153                        if (!ep->base.bind_addr.port) {
1154                                if (sctp_autobind(sk)) {
1155                                        err = -EAGAIN;
1156                                        goto out_free;
1157                                }
1158                        } else {
1159                                /*
1160                                 * If an unprivileged user inherits a 1-many
1161                                 * style socket with open associations on a
1162                                 * privileged port, it MAY be permitted to
1163                                 * accept new associations, but it SHOULD NOT
1164                                 * be permitted to open new associations.
1165                                 */
1166                                if (ep->base.bind_addr.port < PROT_SOCK &&
1167                                    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1168                                        err = -EACCES;
1169                                        goto out_free;
1170                                }
1171                        }
1172
1173                        scope = sctp_scope(&to);
1174                        asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1175                        if (!asoc) {
1176                                err = -ENOMEM;
1177                                goto out_free;
1178                        }
1179
1180                        err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
1181                                                              GFP_KERNEL);
1182                        if (err < 0) {
1183                                goto out_free;
1184                        }
1185
1186                }
1187
1188                /* Prime the peer's transport structures.  */
1189                transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
1190                                                SCTP_UNKNOWN);
1191                if (!transport) {
1192                        err = -ENOMEM;
1193                        goto out_free;
1194                }
1195
1196                addrcnt++;
1197                addr_buf += af->sockaddr_len;
1198                walk_size += af->sockaddr_len;
1199        }
1200
1201        /* In case the user of sctp_connectx() wants an association
1202         * id back, assign one now.
1203         */
1204        if (assoc_id) {
1205                err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1206                if (err < 0)
1207                        goto out_free;
1208        }
1209
1210        err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1211        if (err < 0) {
1212                goto out_free;
1213        }
1214
1215        /* Initialize sk's dport and daddr for getpeername() */
1216        inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1217        af = sctp_get_af_specific(sa_addr->sa.sa_family);
1218        af->to_sk_daddr(sa_addr, sk);
1219        sk->sk_err = 0;
1220
1221        /* in-kernel sockets don't generally have a file allocated to them
1222         * if all they do is call sock_create_kern().
1223         */
1224        if (sk->sk_socket->file)
1225                f_flags = sk->sk_socket->file->f_flags;
1226
1227        timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);
1228
1229        err = sctp_wait_for_connect(asoc, &timeo);
1230        if ((err == 0 || err == -EINPROGRESS) && assoc_id)
1231                *assoc_id = asoc->assoc_id;
1232
1233        /* Don't free association on exit. */
1234        asoc = NULL;
1235
1236out_free:
1237
1238        SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
1239                          " kaddrs: %p err: %d\n",
1240                          asoc, kaddrs, err);
1241        if (asoc) {
1242                /* sctp_primitive_ASSOCIATE may have added this association
1243                 * To the hash table, try to unhash it, just in case, its a noop
1244                 * if it wasn't hashed so we're safe
1245                 */
1246                sctp_unhash_established(asoc);
1247                sctp_association_free(asoc);
1248        }
1249        return err;
1250}
1251
1252/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1253 *
1254 * API 8.9
1255 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1256 *                      sctp_assoc_t *asoc);
1257 *
1258 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1259 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1260 * or IPv6 addresses.
1261 *
1262 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1263 * Section 3.1.2 for this usage.
1264 *
1265 * addrs is a pointer to an array of one or more socket addresses. Each
1266 * address is contained in its appropriate structure (i.e. struct
1267 * sockaddr_in or struct sockaddr_in6) the family of the address type
1268 * must be used to distengish the address length (note that this
1269 * representation is termed a "packed array" of addresses). The caller
1270 * specifies the number of addresses in the array with addrcnt.
1271 *
1272 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1273 * the association id of the new association.  On failure, sctp_connectx()
1274 * returns -1, and sets errno to the appropriate error code.  The assoc_id
1275 * is not touched by the kernel.
1276 *
1277 * For SCTP, the port given in each socket address must be the same, or
1278 * sctp_connectx() will fail, setting errno to EINVAL.
1279 *
1280 * An application can use sctp_connectx to initiate an association with
1281 * an endpoint that is multi-homed.  Much like sctp_bindx() this call
1282 * allows a caller to specify multiple addresses at which a peer can be
1283 * reached.  The way the SCTP stack uses the list of addresses to set up
1284 * the association is implementation dependent.  This function only
1285 * specifies that the stack will try to make use of all the addresses in
1286 * the list when needed.
1287 *
1288 * Note that the list of addresses passed in is only used for setting up
1289 * the association.  It does not necessarily equal the set of addresses
1290 * the peer uses for the resulting association.  If the caller wants to
1291 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1292 * retrieve them after the association has been set up.
1293 *
1294 * Basically do nothing but copying the addresses from user to kernel
1295 * land and invoking either sctp_connectx(). This is used for tunneling
1296 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1297 *
1298 * We don't use copy_from_user() for optimization: we first do the
1299 * sanity checks (buffer size -fast- and access check-healthy
1300 * pointer); if all of those succeed, then we can alloc the memory
1301 * (expensive operation) needed to copy the data to kernel. Then we do
1302 * the copying without checking the user space area
1303 * (__copy_from_user()).
1304 *
1305 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1306 * it.
1307 *
1308 * sk        The sk of the socket
1309 * addrs     The pointer to the addresses in user land
1310 * addrssize Size of the addrs buffer
1311 *
1312 * Returns >=0 if ok, <0 errno code on error.
1313 */
1314SCTP_STATIC int __sctp_setsockopt_connectx(struct sock* sk,
1315                                      struct sockaddr __user *addrs,
1316                                      int addrs_size,
1317                                      sctp_assoc_t *assoc_id)
1318{
1319        int err = 0;
1320        struct sockaddr *kaddrs;
1321
1322        SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
1323                          __func__, sk, addrs, addrs_size);
1324
1325        if (unlikely(addrs_size <= 0))
1326                return -EINVAL;
1327
1328        /* Check the user passed a healthy pointer.  */
1329        if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
1330                return -EFAULT;
1331
1332        /* Alloc space for the address array in kernel memory.  */
1333        kaddrs = kmalloc(addrs_size, GFP_KERNEL);
1334        if (unlikely(!kaddrs))
1335                return -ENOMEM;
1336
1337        if (__copy_from_user(kaddrs, addrs, addrs_size)) {
1338                err = -EFAULT;
1339        } else {
1340                err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
1341        }
1342
1343        kfree(kaddrs);
1344
1345        return err;
1346}
1347
1348/*
1349 * This is an older interface.  It's kept for backward compatibility
1350 * to the option that doesn't provide association id.
1351 */
1352SCTP_STATIC int sctp_setsockopt_connectx_old(struct sock* sk,
1353                                      struct sockaddr __user *addrs,
1354                                      int addrs_size)
1355{
1356        return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
1357}
1358
1359/*
1360 * New interface for the API.  The since the API is done with a socket
1361 * option, to make it simple we feed back the association id is as a return
1362 * indication to the call.  Error is always negative and association id is
1363 * always positive.
1364 */
1365SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
1366                                      struct sockaddr __user *addrs,
1367                                      int addrs_size)
1368{
1369        sctp_assoc_t assoc_id = 0;
1370        int err = 0;
1371
1372        err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);
1373
1374        if (err)
1375                return err;
1376        else
1377                return assoc_id;
1378}
1379
1380/*
1381 * New (hopefully final) interface for the API.
1382 * We use the sctp_getaddrs_old structure so that use-space library
1383 * can avoid any unnecessary allocations.   The only defferent part
1384 * is that we store the actual length of the address buffer into the
1385 * addrs_num structure member.  That way we can re-use the existing
1386 * code.
1387 */
1388SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len,
1389                                        char __user *optval,
1390                                        int __user *optlen)
1391{
1392        struct sctp_getaddrs_old param;
1393        sctp_assoc_t assoc_id = 0;
1394        int err = 0;
1395
1396        if (len < sizeof(param))
1397                return -EINVAL;
1398
1399        if (copy_from_user(&param, optval, sizeof(param)))
1400                return -EFAULT;
1401
1402        err = __sctp_setsockopt_connectx(sk,
1403                        (struct sockaddr __user *)param.addrs,
1404                        param.addr_num, &assoc_id);
1405
1406        if (err == 0 || err == -EINPROGRESS) {
1407                if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1408                        return -EFAULT;
1409                if (put_user(sizeof(assoc_id), optlen))
1410                        return -EFAULT;
1411        }
1412
1413        return err;
1414}
1415
1416/* API 3.1.4 close() - UDP Style Syntax
1417 * Applications use close() to perform graceful shutdown (as described in
1418 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1419 * by a UDP-style socket.
1420 *
1421 * The syntax is
1422 *
1423 *   ret = close(int sd);
1424 *
1425 *   sd      - the socket descriptor of the associations to be closed.
1426 *
1427 * To gracefully shutdown a specific association represented by the
1428 * UDP-style socket, an application should use the sendmsg() call,
1429 * passing no user data, but including the appropriate flag in the
1430 * ancillary data (see Section xxxx).
1431 *
1432 * If sd in the close() call is a branched-off socket representing only
1433 * one association, the shutdown is performed on that association only.
1434 *
1435 * 4.1.6 close() - TCP Style Syntax
1436 *
1437 * Applications use close() to gracefully close down an association.
1438 *
1439 * The syntax is:
1440 *
1441 *    int close(int sd);
1442 *
1443 *      sd      - the socket descriptor of the association to be closed.
1444 *
1445 * After an application calls close() on a socket descriptor, no further
1446 * socket operations will succeed on that descriptor.
1447 *
1448 * API 7.1.4 SO_LINGER
1449 *
1450 * An application using the TCP-style socket can use this option to
1451 * perform the SCTP ABORT primitive.  The linger option structure is:
1452 *
1453 *  struct  linger {
1454 *     int     l_onoff;                // option on/off
1455 *     int     l_linger;               // linger time
1456 * };
1457 *
1458 * To enable the option, set l_onoff to 1.  If the l_linger value is set
1459 * to 0, calling close() is the same as the ABORT primitive.  If the
1460 * value is set to a negative value, the setsockopt() call will return
1461 * an error.  If the value is set to a positive value linger_time, the
1462 * close() can be blocked for at most linger_time ms.  If the graceful
1463 * shutdown phase does not finish during this period, close() will
1464 * return but the graceful shutdown phase continues in the system.
1465 */
1466SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
1467{
1468        struct net *net = sock_net(sk);
1469        struct sctp_endpoint *ep;
1470        struct sctp_association *asoc;
1471        struct list_head *pos, *temp;
1472        unsigned int data_was_unread;
1473
1474        SCTP_DEBUG_PRINTK("sctp_close(sk: 0x%p, timeout:%ld)\n", sk, timeout);
1475
1476        sctp_lock_sock(sk);
1477        sk->sk_shutdown = SHUTDOWN_MASK;
1478        sk->sk_state = SCTP_SS_CLOSING;
1479
1480        ep = sctp_sk(sk)->ep;
1481
1482        /* Clean up any skbs sitting on the receive queue.  */
1483        data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1484        data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1485
1486        /* Walk all associations on an endpoint.  */
1487        list_for_each_safe(pos, temp, &ep->asocs) {
1488                asoc = list_entry(pos, struct sctp_association, asocs);
1489
1490                if (sctp_style(sk, TCP)) {
1491                        /* A closed association can still be in the list if
1492                         * it belongs to a TCP-style listening socket that is
1493                         * not yet accepted. If so, free it. If not, send an
1494                         * ABORT or SHUTDOWN based on the linger options.
1495                         */
1496                        if (sctp_state(asoc, CLOSED)) {
1497                                sctp_unhash_established(asoc);
1498                                sctp_association_free(asoc);
1499                                continue;
1500                        }
1501                }
1502
1503                if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1504                    !skb_queue_empty(&asoc->ulpq.reasm) ||
1505                    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1506                        struct sctp_chunk *chunk;
1507
1508                        chunk = sctp_make_abort_user(asoc, NULL, 0);
1509                        if (chunk)
1510                                sctp_primitive_ABORT(net, asoc, chunk);
1511                } else
1512                        sctp_primitive_SHUTDOWN(net, asoc, NULL);
1513        }
1514
1515        /* On a TCP-style socket, block for at most linger_time if set. */
1516        if (sctp_style(sk, TCP) && timeout)
1517                sctp_wait_for_close(sk, timeout);
1518
1519        /* This will run the backlog queue.  */
1520        sctp_release_sock(sk);
1521
1522        /* Supposedly, no process has access to the socket, but
1523         * the net layers still may.
1524         */
1525        sctp_local_bh_disable();
1526        sctp_bh_lock_sock(sk);
1527
1528        /* Hold the sock, since sk_common_release() will put sock_put()
1529         * and we have just a little more cleanup.
1530         */
1531        sock_hold(sk);
1532        sk_common_release(sk);
1533
1534        sctp_bh_unlock_sock(sk);
1535        sctp_local_bh_enable();
1536
1537        sock_put(sk);
1538
1539        SCTP_DBG_OBJCNT_DEC(sock);
1540}
1541
1542/* Handle EPIPE error. */
1543static int sctp_error(struct sock *sk, int flags, int err)
1544{
1545        if (err == -EPIPE)
1546                err = sock_error(sk) ? : -EPIPE;
1547        if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1548                send_sig(SIGPIPE, current, 0);
1549        return err;
1550}
1551
1552/* API 3.1.3 sendmsg() - UDP Style Syntax
1553 *
1554 * An application uses sendmsg() and recvmsg() calls to transmit data to
1555 * and receive data from its peer.
1556 *
1557 *  ssize_t sendmsg(int socket, const struct msghdr *message,
1558 *                  int flags);
1559 *
1560 *  socket  - the socket descriptor of the endpoint.
1561 *  message - pointer to the msghdr structure which contains a single
1562 *            user message and possibly some ancillary data.
1563 *
1564 *            See Section 5 for complete description of the data
1565 *            structures.
1566 *
1567 *  flags   - flags sent or received with the user message, see Section
1568 *            5 for complete description of the flags.
1569 *
1570 * Note:  This function could use a rewrite especially when explicit
1571 * connect support comes in.
1572 */
1573/* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */
1574
1575SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *, sctp_cmsgs_t *);
1576
1577SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
1578                             struct msghdr *msg, size_t msg_len)
1579{
1580        struct net *net = sock_net(sk);
1581        struct sctp_sock *sp;
1582        struct sctp_endpoint *ep;
1583        struct sctp_association *new_asoc=NULL, *asoc=NULL;
1584        struct sctp_transport *transport, *chunk_tp;
1585        struct sctp_chunk *chunk;
1586        union sctp_addr to;
1587        struct sockaddr *msg_name = NULL;
1588        struct sctp_sndrcvinfo default_sinfo;
1589        struct sctp_sndrcvinfo *sinfo;
1590        struct sctp_initmsg *sinit;
1591        sctp_assoc_t associd = 0;
1592        sctp_cmsgs_t cmsgs = { NULL };
1593        int err;
1594        sctp_scope_t scope;
1595        long timeo;
1596        __u16 sinfo_flags = 0;
1597        struct sctp_datamsg *datamsg;
1598        int msg_flags = msg->msg_flags;
1599
1600        SCTP_DEBUG_PRINTK("sctp_sendmsg(sk: %p, msg: %p, msg_len: %zu)\n",
1601                          sk, msg, msg_len);
1602
1603        err = 0;
1604        sp = sctp_sk(sk);
1605        ep = sp->ep;
1606
1607        SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
1608
1609        /* We cannot send a message over a TCP-style listening socket. */
1610        if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
1611                err = -EPIPE;
1612                goto out_nounlock;
1613        }
1614
1615        /* Parse out the SCTP CMSGs.  */
1616        err = sctp_msghdr_parse(msg, &cmsgs);
1617
1618        if (err) {
1619                SCTP_DEBUG_PRINTK("msghdr parse err = %x\n", err);
1620                goto out_nounlock;
1621        }
1622
1623        /* Fetch the destination address for this packet.  This
1624         * address only selects the association--it is not necessarily
1625         * the address we will send to.
1626         * For a peeled-off socket, msg_name is ignored.
1627         */
1628        if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1629                int msg_namelen = msg->msg_namelen;
1630
1631                err = sctp_verify_addr(sk, (union sctp_addr *)msg->msg_name,
1632                                       msg_namelen);
1633                if (err)
1634                        return err;
1635
1636                if (msg_namelen > sizeof(to))
1637                        msg_namelen = sizeof(to);
1638                memcpy(&to, msg->msg_name, msg_namelen);
1639                msg_name = msg->msg_name;
1640        }
1641
1642        sinfo = cmsgs.info;
1643        sinit = cmsgs.init;
1644
1645        /* Did the user specify SNDRCVINFO?  */
1646        if (sinfo) {
1647                sinfo_flags = sinfo->sinfo_flags;
1648                associd = sinfo->sinfo_assoc_id;
1649        }
1650
1651        SCTP_DEBUG_PRINTK("msg_len: %zu, sinfo_flags: 0x%x\n",
1652                          msg_len, sinfo_flags);
1653
1654        /* SCTP_EOF or SCTP_ABORT cannot be set on a TCP-style socket. */
1655        if (sctp_style(sk, TCP) && (sinfo_flags & (SCTP_EOF | SCTP_ABORT))) {
1656                err = -EINVAL;
1657                goto out_nounlock;
1658        }
1659
1660        /* If SCTP_EOF is set, no data can be sent. Disallow sending zero
1661         * length messages when SCTP_EOF|SCTP_ABORT is not set.
1662         * If SCTP_ABORT is set, the message length could be non zero with
1663         * the msg_iov set to the user abort reason.
1664         */
1665        if (((sinfo_flags & SCTP_EOF) && (msg_len > 0)) ||
1666            (!(sinfo_flags & (SCTP_EOF|SCTP_ABORT)) && (msg_len == 0))) {
1667                err = -EINVAL;
1668                goto out_nounlock;
1669        }
1670
1671        /* If SCTP_ADDR_OVER is set, there must be an address
1672         * specified in msg_name.
1673         */
1674        if ((sinfo_flags & SCTP_ADDR_OVER) && (!msg->msg_name)) {
1675                err = -EINVAL;
1676                goto out_nounlock;
1677        }
1678
1679        transport = NULL;
1680
1681        SCTP_DEBUG_PRINTK("About to look up association.\n");
1682
1683        sctp_lock_sock(sk);
1684
1685        /* If a msg_name has been specified, assume this is to be used.  */
1686        if (msg_name) {
1687                /* Look for a matching association on the endpoint. */
1688                asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
1689                if (!asoc) {
1690                        /* If we could not find a matching association on the
1691                         * endpoint, make sure that it is not a TCP-style
1692                         * socket that already has an association or there is
1693                         * no peeled-off association on another socket.
1694                         */
1695                        if ((sctp_style(sk, TCP) &&
1696                             sctp_sstate(sk, ESTABLISHED)) ||
1697                            sctp_endpoint_is_peeled_off(ep, &to)) {
1698                                err = -EADDRNOTAVAIL;
1699                                goto out_unlock;
1700                        }
1701                }
1702        } else {
1703                asoc = sctp_id2assoc(sk, associd);
1704                if (!asoc) {
1705                        err = -EPIPE;
1706                        goto out_unlock;
1707                }
1708        }
1709
1710        if (asoc) {
1711                SCTP_DEBUG_PRINTK("Just looked up association: %p.\n", asoc);
1712
1713                /* We cannot send a message on a TCP-style SCTP_SS_ESTABLISHED
1714                 * socket that has an association in CLOSED state. This can
1715                 * happen when an accepted socket has an association that is
1716                 * already CLOSED.
1717                 */
1718                if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP)) {
1719                        err = -EPIPE;
1720                        goto out_unlock;
1721                }
1722
1723                if (sinfo_flags & SCTP_EOF) {
1724                        SCTP_DEBUG_PRINTK("Shutting down association: %p\n",
1725                                          asoc);
1726                        sctp_primitive_SHUTDOWN(net, asoc, NULL);
1727                        err = 0;
1728                        goto out_unlock;
1729                }
1730                if (sinfo_flags & SCTP_ABORT) {
1731
1732                        chunk = sctp_make_abort_user(asoc, msg, msg_len);
1733                        if (!chunk) {
1734                                err = -ENOMEM;
1735                                goto out_unlock;
1736                        }
1737
1738                        SCTP_DEBUG_PRINTK("Aborting association: %p\n", asoc);
1739                        sctp_primitive_ABORT(net, asoc, chunk);
1740                        err = 0;
1741                        goto out_unlock;
1742                }
1743        }
1744
1745        /* Do we need to create the association?  */
1746        if (!asoc) {
1747                SCTP_DEBUG_PRINTK("There is no association yet.\n");
1748
1749                if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
1750                        err = -EINVAL;
1751                        goto out_unlock;
1752                }
1753
1754                /* Check for invalid stream against the stream counts,
1755                 * either the default or the user specified stream counts.
1756                 */
1757                if (sinfo) {
1758                        if (!sinit || (sinit && !sinit->sinit_num_ostreams)) {
1759                                /* Check against the defaults. */
1760                                if (sinfo->sinfo_stream >=
1761                                    sp->initmsg.sinit_num_ostreams) {
1762                                        err = -EINVAL;
1763                                        goto out_unlock;
1764                                }
1765                        } else {
1766                                /* Check against the requested.  */
1767                                if (sinfo->sinfo_stream >=
1768                                    sinit->sinit_num_ostreams) {
1769                                        err = -EINVAL;
1770                                        goto out_unlock;
1771                                }
1772                        }
1773                }
1774
1775                /*
1776                 * API 3.1.2 bind() - UDP Style Syntax
1777                 * If a bind() or sctp_bindx() is not called prior to a
1778                 * sendmsg() call that initiates a new association, the
1779                 * system picks an ephemeral port and will choose an address
1780                 * set equivalent to binding with a wildcard address.
1781                 */
1782                if (!ep->base.bind_addr.port) {
1783                        if (sctp_autobind(sk)) {
1784                                err = -EAGAIN;
1785                                goto out_unlock;
1786                        }
1787                } else {
1788                        /*
1789                         * If an unprivileged user inherits a one-to-many
1790                         * style socket with open associations on a privileged
1791                         * port, it MAY be permitted to accept new associations,
1792                         * but it SHOULD NOT be permitted to open new
1793                         * associations.
1794                         */
1795                        if (ep->base.bind_addr.port < PROT_SOCK &&
1796                            !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
1797                                err = -EACCES;
1798                                goto out_unlock;
1799                        }
1800                }
1801
1802                scope = sctp_scope(&to);
1803                new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1804                if (!new_asoc) {
1805                        err = -ENOMEM;
1806                        goto out_unlock;
1807                }
1808                asoc = new_asoc;
1809                err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1810                if (err < 0) {
1811                        err = -ENOMEM;
1812                        goto out_free;
1813                }
1814
1815                /* If the SCTP_INIT ancillary data is specified, set all
1816                 * the association init values accordingly.
1817                 */
1818                if (sinit) {
1819                        if (sinit->sinit_num_ostreams) {
1820                                asoc->c.sinit_num_ostreams =
1821                                        sinit->sinit_num_ostreams;
1822                        }
1823                        if (sinit->sinit_max_instreams) {
1824                                asoc->c.sinit_max_instreams =
1825                                        sinit->sinit_max_instreams;
1826                        }
1827                        if (sinit->sinit_max_attempts) {
1828                                asoc->max_init_attempts
1829                                        = sinit->sinit_max_attempts;
1830                        }
1831                        if (sinit->sinit_max_init_timeo) {
1832                                asoc->max_init_timeo =
1833                                 msecs_to_jiffies(sinit->sinit_max_init_timeo);
1834                        }
1835                }
1836
1837                /* Prime the peer's transport structures.  */
1838                transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
1839                if (!transport) {
1840                        err = -ENOMEM;
1841                        goto out_free;
1842                }
1843        }
1844
1845        /* ASSERT: we have a valid association at this point.  */
1846        SCTP_DEBUG_PRINTK("We have a valid association.\n");
1847
1848        if (!sinfo) {
1849                /* If the user didn't specify SNDRCVINFO, make up one with
1850                 * some defaults.
1851                 */
1852                memset(&default_sinfo, 0, sizeof(default_sinfo));
1853                default_sinfo.sinfo_stream = asoc->default_stream;
1854                default_sinfo.sinfo_flags = asoc->default_flags;
1855                default_sinfo.sinfo_ppid = asoc->default_ppid;
1856                default_sinfo.sinfo_context = asoc->default_context;
1857                default_sinfo.sinfo_timetolive = asoc->default_timetolive;
1858                default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
1859                sinfo = &default_sinfo;
1860        }
1861
1862        /* API 7.1.7, the sndbuf size per association bounds the
1863         * maximum size of data that can be sent in a single send call.
1864         */
1865        if (msg_len > sk->sk_sndbuf) {
1866                err = -EMSGSIZE;
1867                goto out_free;
1868        }
1869
1870        if (asoc->pmtu_pending)
1871                sctp_assoc_pending_pmtu(sk, asoc);
1872
1873        /* If fragmentation is disabled and the message length exceeds the
1874         * association fragmentation point, return EMSGSIZE.  The I-D
1875         * does not specify what this error is, but this looks like
1876         * a great fit.
1877         */
1878        if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
1879                err = -EMSGSIZE;
1880                goto out_free;
1881        }
1882
1883        /* Check for invalid stream. */
1884        if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
1885                err = -EINVAL;
1886                goto out_free;
1887        }
1888
1889        timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1890        if (!sctp_wspace(asoc)) {
1891                err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1892                if (err)
1893                        goto out_free;
1894        }
1895
1896        /* If an address is passed with the sendto/sendmsg call, it is used
1897         * to override the primary destination address in the TCP model, or
1898         * when SCTP_ADDR_OVER flag is set in the UDP model.
1899         */
1900        if ((sctp_style(sk, TCP) && msg_name) ||
1901            (sinfo_flags & SCTP_ADDR_OVER)) {
1902                chunk_tp = sctp_assoc_lookup_paddr(asoc, &to);
1903                if (!chunk_tp) {
1904                        err = -EINVAL;
1905                        goto out_free;
1906                }
1907        } else
1908                chunk_tp = NULL;
1909
1910        /* Auto-connect, if we aren't connected already. */
1911        if (sctp_state(asoc, CLOSED)) {
1912                err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1913                if (err < 0)
1914                        goto out_free;
1915                SCTP_DEBUG_PRINTK("We associated primitively.\n");
1916        }
1917
1918        /* Break the message into multiple chunks of maximum size. */
1919        datamsg = sctp_datamsg_from_user(asoc, sinfo, msg, msg_len);
1920        if (IS_ERR(datamsg)) {
1921                err = PTR_ERR(datamsg);
1922                goto out_free;
1923        }
1924
1925        /* Now send the (possibly) fragmented message. */
1926        list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1927                sctp_chunk_hold(chunk);
1928
1929                /* Do accounting for the write space.  */
1930                sctp_set_owner_w(chunk);
1931
1932                chunk->transport = chunk_tp;
1933        }
1934
1935        /* Send it to the lower layers.  Note:  all chunks
1936         * must either fail or succeed.   The lower layer
1937         * works that way today.  Keep it that way or this
1938         * breaks.
1939         */
1940        err = sctp_primitive_SEND(net, asoc, datamsg);
1941        /* Did the lower layer accept the chunk? */
1942        if (err)
1943                sctp_datamsg_free(datamsg);
1944        else
1945                sctp_datamsg_put(datamsg);
1946
1947        SCTP_DEBUG_PRINTK("We sent primitively.\n");
1948
1949        if (err)
1950                goto out_free;
1951        else
1952                err = msg_len;
1953
1954        /* If we are already past ASSOCIATE, the lower
1955         * layers are responsible for association cleanup.
1956         */
1957        goto out_unlock;
1958
1959out_free:
1960        if (new_asoc) {
1961                sctp_unhash_established(asoc);
1962                sctp_association_free(asoc);
1963        }
1964out_unlock:
1965        sctp_release_sock(sk);
1966
1967out_nounlock:
1968        return sctp_error(sk, msg_flags, err);
1969
1970#if 0
1971do_sock_err:
1972        if (msg_len)
1973                err = msg_len;
1974        else
1975                err = sock_error(sk);
1976        goto out;
1977
1978do_interrupted:
1979        if (msg_len)
1980                err = msg_len;
1981        goto out;
1982#endif /* 0 */
1983}
1984
1985/* This is an extended version of skb_pull() that removes the data from the
1986 * start of a skb even when data is spread across the list of skb's in the
1987 * frag_list. len specifies the total amount of data that needs to be removed.
1988 * when 'len' bytes could be removed from the skb, it returns 0.
1989 * If 'len' exceeds the total skb length,  it returns the no. of bytes that
1990 * could not be removed.
1991 */
1992static int sctp_skb_pull(struct sk_buff *skb, int len)
1993{
1994        struct sk_buff *list;
1995        int skb_len = skb_headlen(skb);
1996        int rlen;
1997
1998        if (len <= skb_len) {
1999                __skb_pull(skb, len);
2000                return 0;
2001        }
2002        len -= skb_len;
2003        __skb_pull(skb, skb_len);
2004
2005        skb_walk_frags(skb, list) {
2006                rlen = sctp_skb_pull(list, len);
2007                skb->len -= (len-rlen);
2008                skb->data_len -= (len-rlen);
2009
2010                if (!rlen)
2011                        return 0;
2012
2013                len = rlen;
2014        }
2015
2016        return len;
2017}
2018
2019/* API 3.1.3  recvmsg() - UDP Style Syntax
2020 *
2021 *  ssize_t recvmsg(int socket, struct msghdr *message,
2022 *                    int flags);
2023 *
2024 *  socket  - the socket descriptor of the endpoint.
2025 *  message - pointer to the msghdr structure which contains a single
2026 *            user message and possibly some ancillary data.
2027 *
2028 *            See Section 5 for complete description of the data
2029 *            structures.
2030 *
2031 *  flags   - flags sent or received with the user message, see Section
2032 *            5 for complete description of the flags.
2033 */
2034static struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
2035
2036SCTP_STATIC int sctp_recvmsg(struct kiocb *iocb, struct sock *sk,
2037                             struct msghdr *msg, size_t len, int noblock,
2038                             int flags, int *addr_len)
2039{
2040        struct sctp_ulpevent *event = NULL;
2041        struct sctp_sock *sp = sctp_sk(sk);
2042        struct sk_buff *skb;
2043        int copied;
2044        int err = 0;
2045        int skb_len;
2046
2047        SCTP_DEBUG_PRINTK("sctp_recvmsg(%s: %p, %s: %p, %s: %zd, %s: %d, %s: "
2048                          "0x%x, %s: %p)\n", "sk", sk, "msghdr", msg,
2049                          "len", len, "knoblauch", noblock,
2050                          "flags", flags, "addr_len", addr_len);
2051
2052        sctp_lock_sock(sk);
2053
2054        if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED)) {
2055                err = -ENOTCONN;
2056                goto out;
2057        }
2058
2059        skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2060        if (!skb)
2061                goto out;
2062
2063        /* Get the total length of the skb including any skb's in the
2064         * frag_list.
2065         */
2066        skb_len = skb->len;
2067
2068        copied = skb_len;
2069        if (copied > len)
2070                copied = len;
2071
2072        err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
2073
2074        event = sctp_skb2event(skb);
2075
2076        if (err)
2077                goto out_free;
2078
2079        sock_recv_ts_and_drops(msg, sk, skb);
2080        if (sctp_ulpevent_is_notification(event)) {
2081                msg->msg_flags |= MSG_NOTIFICATION;
2082                sp->pf->event_msgname(event, msg->msg_name, addr_len);
2083        } else {
2084                sp->pf->skb_msgname(skb, msg->msg_name, addr_len);
2085        }
2086
2087        /* Check if we allow SCTP_SNDRCVINFO. */
2088        if (sp->subscribe.sctp_data_io_event)
2089                sctp_ulpevent_read_sndrcvinfo(event, msg);
2090#if 0
2091        /* FIXME: we should be calling IP/IPv6 layers.  */
2092        if (sk->sk_protinfo.af_inet.cmsg_flags)
2093                ip_cmsg_recv(msg, skb);
2094#endif
2095
2096        err = copied;
2097
2098        /* If skb's length exceeds the user's buffer, update the skb and
2099         * push it back to the receive_queue so that the next call to
2100         * recvmsg() will return the remaining data. Don't set MSG_EOR.
2101         */
2102        if (skb_len > copied) {
2103                msg->msg_flags &= ~MSG_EOR;
2104                if (flags & MSG_PEEK)
2105                        goto out_free;
2106                sctp_skb_pull(skb, copied);
2107                skb_queue_head(&sk->sk_receive_queue, skb);
2108
2109                /* When only partial message is copied to the user, increase
2110                 * rwnd by that amount. If all the data in the skb is read,
2111                 * rwnd is updated when the event is freed.
2112                 */
2113                if (!sctp_ulpevent_is_notification(event))
2114                        sctp_assoc_rwnd_increase(event->asoc, copied);
2115                goto out;
2116        } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2117                   (event->msg_flags & MSG_EOR))
2118                msg->msg_flags |= MSG_EOR;
2119        else
2120                msg->msg_flags &= ~MSG_EOR;
2121
2122out_free:
2123        if (flags & MSG_PEEK) {
2124                /* Release the skb reference acquired after peeking the skb in
2125                 * sctp_skb_recv_datagram().
2126                 */
2127                kfree_skb(skb);
2128        } else {
2129                /* Free the event which includes releasing the reference to
2130                 * the owner of the skb, freeing the skb and updating the
2131                 * rwnd.
2132                 */
2133                sctp_ulpevent_free(event);
2134        }
2135out:
2136        sctp_release_sock(sk);
2137        return err;
2138}
2139
2140/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2141 *
2142 * This option is a on/off flag.  If enabled no SCTP message
2143 * fragmentation will be performed.  Instead if a message being sent
2144 * exceeds the current PMTU size, the message will NOT be sent and
2145 * instead a error will be indicated to the user.
2146 */
2147static int sctp_setsockopt_disable_fragments(struct sock *sk,
2148                                             char __user *optval,
2149                                             unsigned int optlen)
2150{
2151        int val;
2152
2153        if (optlen < sizeof(int))
2154                return -EINVAL;
2155
2156        if (get_user(val, (int __user *)optval))
2157                return -EFAULT;
2158
2159        sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;
2160
2161        return 0;
2162}
2163
2164static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2165                                  unsigned int optlen)
2166{
2167        struct sctp_association *asoc;
2168        struct sctp_ulpevent *event;
2169
2170        if (optlen > sizeof(struct sctp_event_subscribe))
2171                return -EINVAL;
2172        if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
2173                return -EFAULT;
2174
2175        /*
2176         * At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2177         * if there is no data to be sent or retransmit, the stack will
2178         * immediately send up this notification.
2179         */
2180        if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
2181                                       &sctp_sk(sk)->subscribe)) {
2182                asoc = sctp_id2assoc(sk, 0);
2183
2184                if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2185                        event = sctp_ulpevent_make_sender_dry_event(asoc,
2186                                        GFP_ATOMIC);
2187                        if (!event)
2188                                return -ENOMEM;
2189
2190                        sctp_ulpq_tail_event(&asoc->ulpq, event);
2191                }
2192        }
2193
2194        return 0;
2195}
2196
2197/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2198 *
2199 * This socket option is applicable to the UDP-style socket only.  When
2200 * set it will cause associations that are idle for more than the
2201 * specified number of seconds to automatically close.  An association
2202 * being idle is defined an association that has NOT sent or received
2203 * user data.  The special value of '0' indicates that no automatic
2204 * close of any associations should be performed.  The option expects an
2205 * integer defining the number of seconds of idle time before an
2206 * association is closed.
2207 */
2208static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2209                                     unsigned int optlen)
2210{
2211        struct sctp_sock *sp = sctp_sk(sk);
2212
2213        /* Applicable to UDP-style socket only */
2214        if (sctp_style(sk, TCP))
2215                return -EOPNOTSUPP;
2216        if (optlen != sizeof(int))
2217                return -EINVAL;
2218        if (copy_from_user(&sp->autoclose, optval, optlen))
2219                return -EFAULT;
2220
2221        return 0;
2222}
2223
2224/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2225 *
2226 * Applications can enable or disable heartbeats for any peer address of
2227 * an association, modify an address's heartbeat interval, force a
2228 * heartbeat to be sent immediately, and adjust the address's maximum
2229 * number of retransmissions sent before an address is considered
2230 * unreachable.  The following structure is used to access and modify an
2231 * address's parameters:
2232 *
2233 *  struct sctp_paddrparams {
2234 *     sctp_assoc_t            spp_assoc_id;
2235 *     struct sockaddr_storage spp_address;
2236 *     uint32_t                spp_hbinterval;
2237 *     uint16_t                spp_pathmaxrxt;
2238 *     uint32_t                spp_pathmtu;
2239 *     uint32_t                spp_sackdelay;
2240 *     uint32_t                spp_flags;
2241 * };
2242 *
2243 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2244 *                     application, and identifies the association for
2245 *                     this query.
2246 *   spp_address     - This specifies which address is of interest.
2247 *   spp_hbinterval  - This contains the value of the heartbeat interval,
2248 *                     in milliseconds.  If a  value of zero
2249 *                     is present in this field then no changes are to
2250 *                     be made to this parameter.
2251 *   spp_pathmaxrxt  - This contains the maximum number of
2252 *                     retransmissions before this address shall be
2253 *                     considered unreachable. If a  value of zero
2254 *                     is present in this field then no changes are to
2255 *                     be made to this parameter.
2256 *   spp_pathmtu     - When Path MTU discovery is disabled the value
2257 *                     specified here will be the "fixed" path mtu.
2258 *                     Note that if the spp_address field is empty
2259 *                     then all associations on this address will
2260 *                     have this fixed path mtu set upon them.
2261 *
2262 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2263 *                     the number of milliseconds that sacks will be delayed
2264 *                     for. This value will apply to all addresses of an
2265 *                     association if the spp_address field is empty. Note
2266 *                     also, that if delayed sack is enabled and this
2267 *                     value is set to 0, no change is made to the last
2268 *                     recorded delayed sack timer value.
2269 *
2270 *   spp_flags       - These flags are used to control various features
2271 *                     on an association. The flag field may contain
2272 *                     zero or more of the following options.
2273 *
2274 *                     SPP_HB_ENABLE  - Enable heartbeats on the
2275 *                     specified address. Note that if the address
2276 *                     field is empty all addresses for the association
2277 *                     have heartbeats enabled upon them.
2278 *
2279 *                     SPP_HB_DISABLE - Disable heartbeats on the
2280 *                     speicifed address. Note that if the address
2281 *                     field is empty all addresses for the association
2282 *                     will have their heartbeats disabled. Note also
2283 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2284 *                     mutually exclusive, only one of these two should
2285 *                     be specified. Enabling both fields will have
2286 *                     undetermined results.
2287 *
2288 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2289 *                     to be made immediately.
2290 *
2291 *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2292 *                     heartbeat delayis to be set to the value of 0
2293 *                     milliseconds.
2294 *
2295 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2296 *                     discovery upon the specified address. Note that
2297 *                     if the address feild is empty then all addresses
2298 *                     on the association are effected.
2299 *
2300 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2301 *                     discovery upon the specified address. Note that
2302 *                     if the address feild is empty then all addresses
2303 *                     on the association are effected. Not also that
2304 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2305 *                     exclusive. Enabling both will have undetermined
2306 *                     results.
2307 *
2308 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2309 *                     on delayed sack. The time specified in spp_sackdelay
2310 *                     is used to specify the sack delay for this address. Note
2311 *                     that if spp_address is empty then all addresses will
2312 *                     enable delayed sack and take on the sack delay
2313 *                     value specified in spp_sackdelay.
2314 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2315 *                     off delayed sack. If the spp_address field is blank then
2316 *                     delayed sack is disabled for the entire association. Note
2317 *                     also that this field is mutually exclusive to
2318 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2319 *                     results.
2320 */
2321static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2322                                       struct sctp_transport   *trans,
2323                                       struct sctp_association *asoc,
2324                                       struct sctp_sock        *sp,
2325                                       int                      hb_change,
2326                                       int                      pmtud_change,
2327                                       int                      sackdelay_change)
2328{
2329        int error;
2330
2331        if (params->spp_flags & SPP_HB_DEMAND && trans) {
2332                struct net *net = sock_net(trans->asoc->base.sk);
2333
2334                error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2335                if (error)
2336                        return error;
2337        }
2338
2339        /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2340         * this field is ignored.  Note also that a value of zero indicates
2341         * the current setting should be left unchanged.
2342         */
2343        if (params->spp_flags & SPP_HB_ENABLE) {
2344
2345                /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2346                 * set.  This lets us use 0 value when this flag
2347                 * is set.
2348                 */
2349                if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2350                        params->spp_hbinterval = 0;
2351
2352                if (params->spp_hbinterval ||
2353                    (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2354                        if (trans) {
2355                                trans->hbinterval =
2356                                    msecs_to_jiffies(params->spp_hbinterval);
2357                        } else if (asoc) {
2358                                asoc->hbinterval =
2359                                    msecs_to_jiffies(params->spp_hbinterval);
2360                        } else {
2361                                sp->hbinterval = params->spp_hbinterval;
2362                        }
2363                }
2364        }
2365
2366        if (hb_change) {
2367                if (trans) {
2368                        trans->param_flags =
2369                                (trans->param_flags & ~SPP_HB) | hb_change;
2370                } else if (asoc) {
2371                        asoc->param_flags =
2372                                (asoc->param_flags & ~SPP_HB) | hb_change;
2373                } else {
2374                        sp->param_flags =
2375                                (sp->param_flags & ~SPP_HB) | hb_change;
2376                }
2377        }
2378
2379        /* When Path MTU discovery is disabled the value specified here will
2380         * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2381         * include the flag SPP_PMTUD_DISABLE for this field to have any
2382         * effect).
2383         */
2384        if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2385                if (trans) {
2386                        trans->pathmtu = params->spp_pathmtu;
2387                        sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2388                } else if (asoc) {
2389                        asoc->pathmtu = params->spp_pathmtu;
2390                        sctp_frag_point(asoc, params->spp_pathmtu);
2391                } else {
2392                        sp->pathmtu = params->spp_pathmtu;
2393                }
2394        }
2395
2396        if (pmtud_change) {
2397                if (trans) {
2398                        int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2399                                (params->spp_flags & SPP_PMTUD_ENABLE);
2400                        trans->param_flags =
2401                                (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2402                        if (update) {
2403                                sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2404                                sctp_assoc_sync_pmtu(sctp_opt2sk(sp), asoc);
2405                        }
2406                } else if (asoc) {
2407                        asoc->param_flags =
2408                                (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2409                } else {
2410                        sp->param_flags =
2411                                (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2412                }
2413        }
2414
2415        /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2416         * value of this field is ignored.  Note also that a value of zero
2417         * indicates the current setting should be left unchanged.
2418         */
2419        if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2420                if (trans) {
2421                        trans->sackdelay =
2422                                msecs_to_jiffies(params->spp_sackdelay);
2423                } else if (asoc) {
2424                        asoc->sackdelay =
2425                                msecs_to_jiffies(params->spp_sackdelay);
2426                } else {
2427                        sp->sackdelay = params->spp_sackdelay;
2428                }
2429        }
2430
2431        if (sackdelay_change) {
2432                if (trans) {
2433                        trans->param_flags =
2434                                (trans->param_flags & ~SPP_SACKDELAY) |
2435                                sackdelay_change;
2436                } else if (asoc) {
2437                        asoc->param_flags =
2438                                (asoc->param_flags & ~SPP_SACKDELAY) |
2439                                sackdelay_change;
2440                } else {
2441                        sp->param_flags =
2442                                (sp->param_flags & ~SPP_SACKDELAY) |
2443                                sackdelay_change;
2444                }
2445        }
2446
2447        /* Note that a value of zero indicates the current setting should be
2448           left unchanged.
2449         */
2450        if (params->spp_pathmaxrxt) {
2451                if (trans) {
2452                        trans->pathmaxrxt = params->spp_pathmaxrxt;
2453                } else if (asoc) {
2454                        asoc->pathmaxrxt = params->spp_pathmaxrxt;
2455                } else {
2456                        sp->pathmaxrxt = params->spp_pathmaxrxt;
2457                }
2458        }
2459
2460        return 0;
2461}
2462
2463static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2464                                            char __user *optval,
2465                                            unsigned int optlen)
2466{
2467        struct sctp_paddrparams  params;
2468        struct sctp_transport   *trans = NULL;
2469        struct sctp_association *asoc = NULL;
2470        struct sctp_sock        *sp = sctp_sk(sk);
2471        int error;
2472        int hb_change, pmtud_change, sackdelay_change;
2473
2474        if (optlen != sizeof(struct sctp_paddrparams))
2475                return - EINVAL;
2476
2477        if (copy_from_user(&params, optval, optlen))
2478                return -EFAULT;
2479
2480        /* Validate flags and value parameters. */
2481        hb_change        = params.spp_flags & SPP_HB;
2482        pmtud_change     = params.spp_flags & SPP_PMTUD;
2483        sackdelay_change = params.spp_flags & SPP_SACKDELAY;
2484
2485        if (hb_change        == SPP_HB ||
2486            pmtud_change     == SPP_PMTUD ||
2487            sackdelay_change == SPP_SACKDELAY ||
2488            params.spp_sackdelay > 500 ||
2489            (params.spp_pathmtu &&
2490             params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2491                return -EINVAL;
2492
2493        /* If an address other than INADDR_ANY is specified, and
2494         * no transport is found, then the request is invalid.
2495         */
2496        if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
2497                trans = sctp_addr_id2transport(sk, &params.spp_address,
2498                                               params.spp_assoc_id);
2499                if (!trans)
2500                        return -EINVAL;
2501        }
2502
2503        /* Get association, if assoc_id != 0 and the socket is a one
2504         * to many style socket, and an association was not found, then
2505         * the id was invalid.
2506         */
2507        asoc = sctp_id2assoc(sk, params.spp_assoc_id);
2508        if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
2509                return -EINVAL;
2510
2511        /* Heartbeat demand can only be sent on a transport or
2512         * association, but not a socket.
2513         */
2514        if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2515                return -EINVAL;
2516
2517        /* Process parameters. */
2518        error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2519                                            hb_change, pmtud_change,
2520                                            sackdelay_change);
2521
2522        if (error)
2523                return error;
2524
2525        /* If changes are for association, also apply parameters to each
2526         * transport.
2527         */
2528        if (!trans && asoc) {
2529                list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2530                                transports) {
2531                        sctp_apply_peer_addr_params(&params, trans, asoc, sp,
2532                                                    hb_change, pmtud_change,
2533                                                    sackdelay_change);
2534                }
2535        }
2536
2537        return 0;
2538}
2539
2540/*
2541 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2542 *
2543 * This option will effect the way delayed acks are performed.  This
2544 * option allows you to get or set the delayed ack time, in
2545 * milliseconds.  It also allows changing the delayed ack frequency.
2546 * Changing the frequency to 1 disables the delayed sack algorithm.  If
2547 * the assoc_id is 0, then this sets or gets the endpoints default
2548 * values.  If the assoc_id field is non-zero, then the set or get
2549 * effects the specified association for the one to many model (the
2550 * assoc_id field is ignored by the one to one model).  Note that if
2551 * sack_delay or sack_freq are 0 when setting this option, then the
2552 * current values will remain unchanged.
2553 *
2554 * struct sctp_sack_info {
2555 *     sctp_assoc_t            sack_assoc_id;
2556 *     uint32_t                sack_delay;
2557 *     uint32_t                sack_freq;
2558 * };
2559 *
2560 * sack_assoc_id -  This parameter, indicates which association the user
2561 *    is performing an action upon.  Note that if this field's value is
2562 *    zero then the endpoints default value is changed (effecting future
2563 *    associations only).
2564 *
2565 * sack_delay -  This parameter contains the number of milliseconds that
2566 *    the user is requesting the delayed ACK timer be set to.  Note that
2567 *    this value is defined in the standard to be between 200 and 500
2568 *    milliseconds.
2569 *
2570 * sack_freq -  This parameter contains the number of packets that must
2571 *    be received before a sack is sent without waiting for the delay
2572 *    timer to expire.  The default value for this is 2, setting this
2573 *    value to 1 will disable the delayed sack algorithm.
2574 */
2575
2576static int sctp_setsockopt_delayed_ack(struct sock *sk,
2577                                       char __user *optval, unsigned int optlen)
2578{
2579        struct sctp_sack_info    params;
2580        struct sctp_transport   *trans = NULL;
2581        struct sctp_association *asoc = NULL;
2582        struct sctp_sock        *sp = sctp_sk(sk);
2583
2584        if (optlen == sizeof(struct sctp_sack_info)) {
2585                if (copy_from_user(&params, optval, optlen))
2586                        return -EFAULT;
2587
2588                if (params.sack_delay == 0 && params.sack_freq == 0)
2589                        return 0;
2590        } else if (optlen == sizeof(struct sctp_assoc_value)) {
2591                pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
2592                pr_warn("Use struct sctp_sack_info instead\n");
2593                if (copy_from_user(&params, optval, optlen))
2594                        return -EFAULT;
2595
2596                if (params.sack_delay == 0)
2597                        params.sack_freq = 1;
2598                else
2599                        params.sack_freq = 0;
2600        } else
2601                return - EINVAL;
2602
2603        /* Validate value parameter. */
2604        if (params.sack_delay > 500)
2605                return -EINVAL;
2606
2607        /* Get association, if sack_assoc_id != 0 and the socket is a one
2608         * to many style socket, and an association was not found, then
2609         * the id was invalid.
2610         */
2611        asoc = sctp_id2assoc(sk, params.sack_assoc_id);
2612        if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2613                return -EINVAL;
2614
2615        if (params.sack_delay) {
2616                if (asoc) {
2617                        asoc->sackdelay =
2618                                msecs_to_jiffies(params.sack_delay);
2619                        asoc->param_flags =
2620                                (asoc->param_flags & ~SPP_SACKDELAY) |
2621                                SPP_SACKDELAY_ENABLE;
2622                } else {
2623                        sp->sackdelay = params.sack_delay;
2624                        sp->param_flags =
2625                                (sp->param_flags & ~SPP_SACKDELAY) |
2626                                SPP_SACKDELAY_ENABLE;
2627                }
2628        }
2629
2630        if (params.sack_freq == 1) {
2631                if (asoc) {
2632                        asoc->param_flags =
2633                                (asoc->param_flags & ~SPP_SACKDELAY) |
2634                                SPP_SACKDELAY_DISABLE;
2635                } else {
2636                        sp->param_flags =
2637                                (sp->param_flags & ~SPP_SACKDELAY) |
2638                                SPP_SACKDELAY_DISABLE;
2639                }
2640        } else if (params.sack_freq > 1) {
2641                if (asoc) {
2642                        asoc->sackfreq = params.sack_freq;
2643                        asoc->param_flags =
2644                                (asoc->param_flags & ~SPP_SACKDELAY) |
2645                                SPP_SACKDELAY_ENABLE;
2646                } else {
2647                        sp->sackfreq = params.sack_freq;
2648                        sp->param_flags =
2649                                (sp->param_flags & ~SPP_SACKDELAY) |
2650                                SPP_SACKDELAY_ENABLE;
2651                }
2652        }
2653
2654        /* If change is for association, also apply to each transport. */
2655        if (asoc) {
2656                list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2657                                transports) {
2658                        if (params.sack_delay) {
2659                                trans->sackdelay =
2660                                        msecs_to_jiffies(params.sack_delay);
2661                                trans->param_flags =
2662                                        (trans->param_flags & ~SPP_SACKDELAY) |
2663                                        SPP_SACKDELAY_ENABLE;
2664                        }
2665                        if (params.sack_freq == 1) {
2666                                trans->param_flags =
2667                                        (trans->param_flags & ~SPP_SACKDELAY) |
2668                                        SPP_SACKDELAY_DISABLE;
2669                        } else if (params.sack_freq > 1) {
2670                                trans->sackfreq = params.sack_freq;
2671                                trans->param_flags =
2672                                        (trans->param_flags & ~SPP_SACKDELAY) |
2673                                        SPP_SACKDELAY_ENABLE;
2674                        }
2675                }
2676        }
2677
2678        return 0;
2679}
2680
2681/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2682 *
2683 * Applications can specify protocol parameters for the default association
2684 * initialization.  The option name argument to setsockopt() and getsockopt()
2685 * is SCTP_INITMSG.
2686 *
2687 * Setting initialization parameters is effective only on an unconnected
2688 * socket (for UDP-style sockets only future associations are effected
2689 * by the change).  With TCP-style sockets, this option is inherited by
2690 * sockets derived from a listener socket.
2691 */
2692static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
2693{
2694        struct sctp_initmsg sinit;
2695        struct sctp_sock *sp = sctp_sk(sk);
2696
2697        if (optlen != sizeof(struct sctp_initmsg))
2698                return -EINVAL;
2699        if (copy_from_user(&sinit, optval, optlen))
2700                return -EFAULT;
2701
2702        if (sinit.sinit_num_ostreams)
2703                sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
2704        if (sinit.sinit_max_instreams)
2705                sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
2706        if (sinit.sinit_max_attempts)
2707                sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
2708        if (sinit.sinit_max_init_timeo)
2709                sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
2710
2711        return 0;
2712}
2713
2714/*
2715 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2716 *
2717 *   Applications that wish to use the sendto() system call may wish to
2718 *   specify a default set of parameters that would normally be supplied
2719 *   through the inclusion of ancillary data.  This socket option allows
2720 *   such an application to set the default sctp_sndrcvinfo structure.
2721 *   The application that wishes to use this socket option simply passes
2722 *   in to this call the sctp_sndrcvinfo structure defined in Section
2723 *   5.2.2) The input parameters accepted by this call include
2724 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2725 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2726 *   to this call if the caller is using the UDP model.
2727 */
2728static int sctp_setsockopt_default_send_param(struct sock *sk,
2729                                              char __user *optval,
2730                                              unsigned int optlen)
2731{
2732        struct sctp_sndrcvinfo info;
2733        struct sctp_association *asoc;
2734        struct sctp_sock *sp = sctp_sk(sk);
2735
2736        if (optlen != sizeof(struct sctp_sndrcvinfo))
2737                return -EINVAL;
2738        if (copy_from_user(&info, optval, optlen))
2739                return -EFAULT;
2740
2741        asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
2742        if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
2743                return -EINVAL;
2744
2745        if (asoc) {
2746                asoc->default_stream = info.sinfo_stream;
2747                asoc->default_flags = info.sinfo_flags;
2748                asoc->default_ppid = info.sinfo_ppid;
2749                asoc->default_context = info.sinfo_context;
2750                asoc->default_timetolive = info.sinfo_timetolive;
2751        } else {
2752                sp->default_stream = info.sinfo_stream;
2753                sp->default_flags = info.sinfo_flags;
2754                sp->default_ppid = info.sinfo_ppid;
2755                sp->default_context = info.sinfo_context;
2756                sp->default_timetolive = info.sinfo_timetolive;
2757        }
2758
2759        return 0;
2760}
2761
2762/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
2763 *
2764 * Requests that the local SCTP stack use the enclosed peer address as
2765 * the association primary.  The enclosed address must be one of the
2766 * association peer's addresses.
2767 */
2768static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2769                                        unsigned int optlen)
2770{
2771        struct sctp_prim prim;
2772        struct sctp_transport *trans;
2773
2774        if (optlen != sizeof(struct sctp_prim))
2775                return -EINVAL;
2776
2777        if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
2778                return -EFAULT;
2779
2780        trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
2781        if (!trans)
2782                return -EINVAL;
2783
2784        sctp_assoc_set_primary(trans->asoc, trans);
2785
2786        return 0;
2787}
2788
2789/*
2790 * 7.1.5 SCTP_NODELAY
2791 *
2792 * Turn on/off any Nagle-like algorithm.  This means that packets are
2793 * generally sent as soon as possible and no unnecessary delays are
2794 * introduced, at the cost of more packets in the network.  Expects an
2795 *  integer boolean flag.
2796 */
2797static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2798                                   unsigned int optlen)
2799{
2800        int val;
2801
2802        if (optlen < sizeof(int))
2803                return -EINVAL;
2804        if (get_user(val, (int __user *)optval))
2805                return -EFAULT;
2806
2807        sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
2808        return 0;
2809}
2810
2811/*
2812 *
2813 * 7.1.1 SCTP_RTOINFO
2814 *
2815 * The protocol parameters used to initialize and bound retransmission
2816 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
2817 * and modify these parameters.
2818 * All parameters are time values, in milliseconds.  A value of 0, when
2819 * modifying the parameters, indicates that the current value should not
2820 * be changed.
2821 *
2822 */
2823static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
2824{
2825        struct sctp_rtoinfo rtoinfo;
2826        struct sctp_association *asoc;
2827
2828        if (optlen != sizeof (struct sctp_rtoinfo))
2829                return -EINVAL;
2830
2831        if (copy_from_user(&rtoinfo, optval, optlen))
2832                return -EFAULT;
2833
2834        asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
2835
2836        /* Set the values to the specific association */
2837        if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
2838                return -EINVAL;
2839
2840        if (asoc) {
2841                if (rtoinfo.srto_initial != 0)
2842                        asoc->rto_initial =
2843                                msecs_to_jiffies(rtoinfo.srto_initial);
2844                if (rtoinfo.srto_max != 0)
2845                        asoc->rto_max = msecs_to_jiffies(rtoinfo.srto_max);
2846                if (rtoinfo.srto_min != 0)
2847                        asoc->rto_min = msecs_to_jiffies(rtoinfo.srto_min);
2848        } else {
2849                /* If there is no association or the association-id = 0
2850                 * set the values to the endpoint.
2851                 */
2852                struct sctp_sock *sp = sctp_sk(sk);
2853
2854                if (rtoinfo.srto_initial != 0)
2855                        sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
2856                if (rtoinfo.srto_max != 0)
2857                        sp->rtoinfo.srto_max = rtoinfo.srto_max;
2858                if (rtoinfo.srto_min != 0)
2859                        sp->rtoinfo.srto_min = rtoinfo.srto_min;
2860        }
2861
2862        return 0;
2863}
2864
2865/*
2866 *
2867 * 7.1.2 SCTP_ASSOCINFO
2868 *
2869 * This option is used to tune the maximum retransmission attempts
2870 * of the association.
2871 * Returns an error if the new association retransmission value is
2872 * greater than the sum of the retransmission value  of the peer.
2873 * See [SCTP] for more information.
2874 *
2875 */
2876static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
2877{
2878
2879        struct sctp_assocparams assocparams;
2880        struct sctp_association *asoc;
2881
2882        if (optlen != sizeof(struct sctp_assocparams))
2883                return -EINVAL;
2884        if (copy_from_user(&assocparams, optval, optlen))
2885                return -EFAULT;
2886
2887        asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
2888
2889        if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
2890                return -EINVAL;
2891
2892        /* Set the values to the specific association */
2893        if (asoc) {
2894                if (assocparams.sasoc_asocmaxrxt != 0) {
2895                        __u32 path_sum = 0;
2896                        int   paths = 0;
2897                        struct sctp_transport *peer_addr;
2898
2899                        list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
2900                                        transports) {
2901                                path_sum += peer_addr->pathmaxrxt;
2902                                paths++;
2903                        }
2904
2905                        /* Only validate asocmaxrxt if we have more than
2906                         * one path/transport.  We do this because path
2907                         * retransmissions are only counted when we have more
2908                         * then one path.
2909                         */
2910                        if (paths > 1 &&
2911                            assocparams.sasoc_asocmaxrxt > path_sum)
2912                                return -EINVAL;
2913
2914                        asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
2915                }
2916
2917                if (assocparams.sasoc_cookie_life != 0) {
2918                        asoc->cookie_life.tv_sec =
2919                                        assocparams.sasoc_cookie_life / 1000;
2920                        asoc->cookie_life.tv_usec =
2921                                        (assocparams.sasoc_cookie_life % 1000)
2922                                        * 1000;
2923                }
2924        } else {
2925                /* Set the values to the endpoint */
2926                struct sctp_sock *sp = sctp_sk(sk);
2927
2928                if (assocparams.sasoc_asocmaxrxt != 0)
2929                        sp->assocparams.sasoc_asocmaxrxt =
2930                                                assocparams.sasoc_asocmaxrxt;
2931                if (assocparams.sasoc_cookie_life != 0)
2932                        sp->assocparams.sasoc_cookie_life =
2933                                                assocparams.sasoc_cookie_life;
2934        }
2935        return 0;
2936}
2937
2938/*
2939 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
2940 *
2941 * This socket option is a boolean flag which turns on or off mapped V4
2942 * addresses.  If this option is turned on and the socket is type
2943 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
2944 * If this option is turned off, then no mapping will be done of V4
2945 * addresses and a user will receive both PF_INET6 and PF_INET type
2946 * addresses on the socket.
2947 */
2948static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
2949{
2950        int val;
2951        struct sctp_sock *sp = sctp_sk(sk);
2952
2953        if (optlen < sizeof(int))
2954                return -EINVAL;
2955        if (get_user(val, (int __user *)optval))
2956                return -EFAULT;
2957        if (val)
2958                sp->v4mapped = 1;
2959        else
2960                sp->v4mapped = 0;
2961
2962        return 0;
2963}
2964
2965/*
2966 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
2967 * This option will get or set the maximum size to put in any outgoing
2968 * SCTP DATA chunk.  If a message is larger than this size it will be
2969 * fragmented by SCTP into the specified size.  Note that the underlying
2970 * SCTP implementation may fragment into smaller sized chunks when the
2971 * PMTU of the underlying association is smaller than the value set by
2972 * the user.  The default value for this option is '0' which indicates
2973 * the user is NOT limiting fragmentation and only the PMTU will effect
2974 * SCTP's choice of DATA chunk size.  Note also that values set larger
2975 * than the maximum size of an IP datagram will effectively let SCTP
2976 * control fragmentation (i.e. the same as setting this option to 0).
2977 *
2978 * The following structure is used to access and modify this parameter:
2979 *
2980 * struct sctp_assoc_value {
2981 *   sctp_assoc_t assoc_id;
2982 *   uint32_t assoc_value;
2983 * };
2984 *
2985 * assoc_id:  This parameter is ignored for one-to-one style sockets.
2986 *    For one-to-many style sockets this parameter indicates which
2987 *    association the user is performing an action upon.  Note that if
2988 *    this field's value is zero then the endpoints default value is
2989 *    changed (effecting future associations only).
2990 * assoc_value:  This parameter specifies the maximum size in bytes.
2991 */
2992static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
2993{
2994        struct sctp_assoc_value params;
2995        struct sctp_association *asoc;
2996        struct sctp_sock *sp = sctp_sk(sk);
2997        int val;
2998
2999        if (optlen == sizeof(int)) {
3000                pr_warn("Use of int in maxseg socket option deprecated\n");
3001                pr_warn("Use struct sctp_assoc_value instead\n");
3002                if (copy_from_user(&val, optval, optlen))
3003                        return -EFAULT;
3004                params.assoc_id = 0;
3005        } else if (optlen == sizeof(struct sctp_assoc_value)) {
3006                if (copy_from_user(&params, optval, optlen))
3007                        return -EFAULT;
3008                val = params.assoc_value;
3009        } else
3010                return -EINVAL;
3011
3012        if ((val != 0) && ((val < 8) || (val > SCTP_MAX_CHUNK_LEN)))
3013                return -EINVAL;
3014
3015        asoc = sctp_id2assoc(sk, params.assoc_id);
3016        if (!asoc && params.assoc_id && sctp_style(sk, UDP))
3017                return -EINVAL;
3018
3019        if (asoc) {
3020                if (val == 0) {
3021                        val = asoc->pathmtu;
3022                        val -= sp->pf->af->net_header_len;
3023                        val -= sizeof(struct sctphdr) +
3024                                        sizeof(struct sctp_data_chunk);
3025                }
3026                asoc->user_frag = val;
3027                asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3028        } else {
3029                sp->user_frag = val;
3030        }
3031
3032        return 0;
3033}
3034
3035
3036/*
3037 *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3038 *
3039 *   Requests that the peer mark the enclosed address as the association
3040 *   primary. The enclosed address must be one of the association's
3041 *   locally bound addresses. The following structure is used to make a
3042 *   set primary request:
3043 */
3044static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3045                                             unsigned int optlen)
3046{
3047        struct net *net = sock_net(sk);
3048        struct sctp_sock        *sp;
3049        struct sctp_association *asoc = NULL;
3050        struct sctp_setpeerprim prim;
3051        struct sctp_chunk       *chunk;
3052        struct sctp_af          *af;
3053        int                     err;
3054
3055        sp = sctp_sk(sk);
3056
3057        if (!net->sctp.addip_enable)
3058                return -EPERM;
3059
3060        if (optlen != sizeof(struct sctp_setpeerprim))
3061                return -EINVAL;
3062
3063        if (copy_from_user(&prim, optval, optlen))
3064                return -EFAULT;
3065
3066        asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3067        if (!asoc)
3068                return -EINVAL;
3069
3070        if (!asoc->peer.asconf_capable)
3071                return -EPERM;
3072
3073        if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3074                return -EPERM;
3075
3076        if (!sctp_state(asoc, ESTABLISHED))
3077                return -ENOTCONN;
3078
3079        af = sctp_get_af_specific(prim.sspp_addr.ss_family);
3080        if (!af)
3081                return -EINVAL;
3082
3083        if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
3084                return -EADDRNOTAVAIL;
3085
3086        if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
3087                return -EADDRNOTAVAIL;
3088
3089        /* Create an ASCONF chunk with SET_PRIMARY parameter    */
3090        chunk = sctp_make_asconf_set_prim(asoc,
3091                                          (union sctp_addr *)&prim.sspp_addr);
3092        if (!chunk)
3093                return -ENOMEM;
3094
3095        err = sctp_send_asconf(asoc, chunk);
3096
3097        SCTP_DEBUG_PRINTK("We set peer primary addr primitively.\n");
3098
3099        return err;
3100}
3101
3102static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3103                                            unsigned int optlen)
3104{
3105        struct sctp_setadaptation adaptation;
3106
3107        if (optlen != sizeof(struct sctp_setadaptation))
3108                return -EINVAL;
3109        if (copy_from_user(&adaptation, optval, optlen))
3110                return -EFAULT;
3111
3112        sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
3113
3114        return 0;
3115}
3116
3117/*
3118 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3119 *
3120 * The context field in the sctp_sndrcvinfo structure is normally only
3121 * used when a failed message is retrieved holding the value that was
3122 * sent down on the actual send call.  This option allows the setting of
3123 * a default context on an association basis that will be received on
3124 * reading messages from the peer.  This is especially helpful in the
3125 * one-2-many model for an application to keep some reference to an
3126 * internal state machine that is processing messages on the
3127 * association.  Note that the setting of this value only effects
3128 * received messages from the peer and does not effect the value that is
3129 * saved with outbound messages.
3130 */
3131static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3132                                   unsigned int optlen)
3133{
3134        struct sctp_assoc_value params;
3135        struct sctp_sock *sp;
3136        struct sctp_association *asoc;
3137
3138        if (optlen != sizeof(struct sctp_assoc_value))
3139                return -EINVAL;
3140        if (copy_from_user(&params, optval, optlen))
3141                return -EFAULT;
3142
3143        sp = sctp_sk(sk);
3144
3145        if (params.assoc_id != 0) {
3146                asoc = sctp_id2assoc(sk, params.assoc_id);
3147                if (!asoc)
3148                        return -EINVAL;
3149                asoc->default_rcv_context = params.assoc_value;
3150        } else {
3151                sp->default_rcv_context = params.assoc_value;
3152        }
3153
3154        return 0;
3155}
3156
3157/*
3158 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3159 *
3160 * This options will at a minimum specify if the implementation is doing
3161 * fragmented interleave.  Fragmented interleave, for a one to many
3162 * socket, is when subsequent calls to receive a message may return
3163 * parts of messages from different associations.  Some implementations
3164 * may allow you to turn this value on or off.  If so, when turned off,
3165 * no fragment interleave will occur (which will cause a head of line
3166 * blocking amongst multiple associations sharing the same one to many
3167 * socket).  When this option is turned on, then each receive call may
3168 * come from a different association (thus the user must receive data
3169 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3170 * association each receive belongs to.
3171 *
3172 * This option takes a boolean value.  A non-zero value indicates that
3173 * fragmented interleave is on.  A value of zero indicates that
3174 * fragmented interleave is off.
3175 *
3176 * Note that it is important that an implementation that allows this
3177 * option to be turned on, have it off by default.  Otherwise an unaware
3178 * application using the one to many model may become confused and act
3179 * incorrectly.
3180 */
3181static int sctp_setsockopt_fragment_interleave(struct sock *sk,
3182                                               char __user *optval,
3183                                               unsigned int optlen)
3184{
3185        int val;
3186
3187        if (optlen != sizeof(int))
3188                return -EINVAL;
3189        if (get_user(val, (int __user *)optval))
3190                return -EFAULT;
3191
3192        sctp_sk(sk)->frag_interleave = (val == 0) ? 0 : 1;
3193
3194        return 0;
3195}
3196
3197/*
3198 * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3199 *       (SCTP_PARTIAL_DELIVERY_POINT)
3200 *
3201 * This option will set or get the SCTP partial delivery point.  This
3202 * point is the size of a message where the partial delivery API will be
3203 * invoked to help free up rwnd space for the peer.  Setting this to a
3204 * lower value will cause partial deliveries to happen more often.  The
3205 * calls argument is an integer that sets or gets the partial delivery
3206 * point.  Note also that the call will fail if the user attempts to set
3207 * this value larger than the socket receive buffer size.
3208 *
3209 * Note that any single message having a length smaller than or equal to
3210 * the SCTP partial delivery point will be delivered in one single read
3211 * call as long as the user provided buffer is large enough to hold the
3212 * message.
3213 */
3214static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
3215                                                  char __user *optval,
3216                                                  unsigned int optlen)
3217{
3218        u32 val;
3219
3220        if (optlen != sizeof(u32))
3221                return -EINVAL;
3222        if (get_user(val, (int __user *)optval))
3223                return -EFAULT;
3224
3225        /* Note: We double the receive buffer from what the user sets
3226         * it to be, also initial rwnd is based on rcvbuf/2.
3227         */
3228        if (val > (sk->sk_rcvbuf >> 1))
3229                return -EINVAL;
3230
3231        sctp_sk(sk)->pd_point = val;
3232
3233        return 0; /* is this the right error code? */
3234}
3235
3236/*
3237 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3238 *
3239 * This option will allow a user to change the maximum burst of packets
3240 * that can be emitted by this association.  Note that the default value
3241 * is 4, and some implementations may restrict this setting so that it
3242 * can only be lowered.
3243 *
3244 * NOTE: This text doesn't seem right.  Do this on a socket basis with
3245 * future associations inheriting the socket value.
3246 */
3247static int sctp_setsockopt_maxburst(struct sock *sk,
3248                                    char __user *optval,
3249                                    unsigned int optlen)
3250{
3251        struct sctp_assoc_value params;
3252        struct sctp_sock *sp;
3253        struct sctp_association *asoc;
3254        int val;
3255        int assoc_id = 0;
3256
3257        if (optlen == sizeof(int)) {
3258                pr_warn("Use of int in max_burst socket option deprecated\n");
3259                pr_warn("Use struct sctp_assoc_value instead\n");
3260                if (copy_from_user(&val, optval, optlen))
3261                        return -EFAULT;
3262        } else if (optlen == sizeof(struct sctp_assoc_value)) {
3263                if (copy_from_user(&params, optval, optlen))
3264                        return -EFAULT;
3265                val = params.assoc_value;
3266                assoc_id = params.assoc_id;
3267        } else
3268                return -EINVAL;
3269
3270        sp = sctp_sk(sk);
3271
3272        if (assoc_id != 0) {
3273                asoc = sctp_id2assoc(sk, assoc_id);
3274                if (!asoc)
3275                        return -EINVAL;
3276                asoc->max_burst = val;
3277        } else
3278                sp->max_burst = val;
3279
3280        return 0;
3281}
3282
3283/*
3284 * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3285 *
3286 * This set option adds a chunk type that the user is requesting to be
3287 * received only in an authenticated way.  Changes to the list of chunks
3288 * will only effect future associations on the socket.
3289 */
3290static int sctp_setsockopt_auth_chunk(struct sock *sk,
3291                                      char __user *optval,
3292                                      unsigned int optlen)
3293{
3294        struct net *net = sock_net(sk);
3295        struct sctp_authchunk val;
3296
3297        if (!net->sctp.auth_enable)
3298                return -EACCES;
3299
3300        if (optlen != sizeof(struct sctp_authchunk))
3301                return -EINVAL;
3302        if (copy_from_user(&val, optval, optlen))
3303                return -EFAULT;
3304
3305        switch (val.sauth_chunk) {
3306        case SCTP_CID_INIT:
3307        case SCTP_CID_INIT_ACK:
3308        case SCTP_CID_SHUTDOWN_COMPLETE:
3309        case SCTP_CID_AUTH:
3310                return -EINVAL;
3311        }
3312
3313        /* add this chunk id to the endpoint */
3314        return sctp_auth_ep_add_chunkid(sctp_sk(sk)->ep, val.sauth_chunk);
3315}
3316
3317/*
3318 * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3319 *
3320 * This option gets or sets the list of HMAC algorithms that the local
3321 * endpoint requires the peer to use.
3322 */
3323static int sctp_setsockopt_hmac_ident(struct sock *sk,
3324                                      char __user *optval,
3325                                      unsigned int optlen)
3326{
3327        struct net *net = sock_net(sk);
3328        struct sctp_hmacalgo *hmacs;
3329        u32 idents;
3330        int err;
3331
3332        if (!net->sctp.auth_enable)
3333                return -EACCES;
3334
3335        if (optlen < sizeof(struct sctp_hmacalgo))
3336                return -EINVAL;
3337
3338        hmacs= memdup_user(optval, optlen);
3339        if (IS_ERR(hmacs))
3340                return PTR_ERR(hmacs);
3341
3342        idents = hmacs->shmac_num_idents;
3343        if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3344            (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3345                err = -EINVAL;
3346                goto out;
3347        }
3348
3349        err = sctp_auth_ep_set_hmacs(sctp_sk(sk)->ep, hmacs);
3350out:
3351        kfree(hmacs);
3352        return err;
3353}
3354
3355/*
3356 * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3357 *
3358 * This option will set a shared secret key which is used to build an
3359 * association shared key.
3360 */
3361static int sctp_setsockopt_auth_key(struct sock *sk,
3362                                    char __user *optval,
3363                                    unsigned int optlen)
3364{
3365        struct net *net = sock_net(sk);
3366        struct sctp_authkey *authkey;
3367        struct sctp_association *asoc;
3368        int ret;
3369
3370        if (!net->sctp.auth_enable)
3371                return -EACCES;
3372
3373        if (optlen <= sizeof(struct sctp_authkey))
3374                return -EINVAL;
3375
3376        authkey= memdup_user(optval, optlen);
3377        if (IS_ERR(authkey))
3378                return PTR_ERR(authkey);
3379
3380        if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3381                ret = -EINVAL;
3382                goto out;
3383        }
3384
3385        asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3386        if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
3387                ret = -EINVAL;
3388                goto out;
3389        }
3390
3391        ret = sctp_auth_set_key(sctp_sk(sk)->ep, asoc, authkey);
3392out:
3393        kzfree(authkey);
3394        return ret;
3395}
3396
3397/*
3398 * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3399 *
3400 * This option will get or set the active shared key to be used to build
3401 * the association shared key.
3402 */
3403static int sctp_setsockopt_active_key(struct sock *sk,
3404                                      char __user *optval,
3405                                      unsigned int optlen)
3406{
3407        struct net *net = sock_net(sk);
3408        struct sctp_authkeyid val;
3409        struct sctp_association *asoc;
3410
3411        if (!net->sctp.auth_enable)
3412                return -EACCES;
3413
3414        if (optlen != sizeof(struct sctp_authkeyid))
3415                return -EINVAL;
3416        if (copy_from_user(&val, optval, optlen))
3417                return -EFAULT;
3418
3419        asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3420        if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3421                return -EINVAL;
3422
3423        return sctp_auth_set_active_key(sctp_sk(sk)->ep, asoc,
3424                                        val.scact_keynumber);
3425}
3426
3427/*
3428 * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3429 *
3430 * This set option will delete a shared secret key from use.
3431 */
3432static int sctp_setsockopt_del_key(struct sock *sk,
3433                                   char __user *optval,
3434                                   unsigned int optlen)
3435{
3436        struct net *net = sock_net(sk);
3437        struct sctp_authkeyid val;
3438        struct sctp_association *asoc;
3439
3440        if (!net->sctp.auth_enable)
3441                return -EACCES;
3442
3443        if (optlen != sizeof(struct sctp_authkeyid))
3444                return -EINVAL;
3445        if (copy_from_user(&val, optval, optlen))
3446                return -EFAULT;
3447
3448        asoc = sctp_id2assoc(sk, val.scact_assoc_id);
3449        if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
3450                return -EINVAL;
3451
3452        return sctp_auth_del_key_id(sctp_sk(sk)->ep, asoc,
3453                                    val.scact_keynumber);
3454
3455}
3456
3457/*
3458 * 8.1.23 SCTP_AUTO_ASCONF
3459 *
3460 * This option will enable or disable the use of the automatic generation of
3461 * ASCONF chunks to add and delete addresses to an existing association.  Note
3462 * that this option has two caveats namely: a) it only affects sockets that
3463 * are bound to all addresses available to the SCTP stack, and b) the system
3464 * administrator may have an overriding control that turns the ASCONF feature
3465 * off no matter what setting the socket option may have.
3466 * This option expects an integer boolean flag, where a non-zero value turns on
3467 * the option, and a zero value turns off the option.
3468 * Note. In this implementation, socket operation overrides default parameter
3469 * being set by sysctl as well as FreeBSD implementation
3470 */
3471static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
3472                                        unsigned int optlen)
3473{
3474        int val;
3475        struct sctp_sock *sp = sctp_sk(sk);
3476
3477        if (optlen < sizeof(int))
3478                return -EINVAL;
3479        if (get_user(val, (int __user *)optval))
3480                return -EFAULT;
3481        if (!sctp_is_ep_boundall(sk) && val)
3482                return -EINVAL;
3483        if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
3484                return 0;
3485
3486        if (val == 0 && sp->do_auto_asconf) {
3487                list_del(&sp->auto_asconf_list);
3488                sp->do_auto_asconf = 0;
3489        } else if (val && !sp->do_auto_asconf) {
3490                list_add_tail(&sp->auto_asconf_list,
3491                    &sock_net(sk)->sctp.auto_asconf_splist);
3492                sp->do_auto_asconf = 1;
3493        }
3494        return 0;
3495}
3496
3497
3498/*
3499 * SCTP_PEER_ADDR_THLDS
3500 *
3501 * This option allows us to alter the partially failed threshold for one or all
3502 * transports in an association.  See Section 6.1 of:
3503 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3504 */
3505static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3506                                            char __user *optval,
3507                                            unsigned int optlen)
3508{
3509        struct sctp_paddrthlds val;
3510        struct sctp_transport *trans;
3511        struct sctp_association *asoc;
3512
3513        if (optlen < sizeof(struct sctp_paddrthlds))
3514                return -EINVAL;
3515        if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
3516                           sizeof(struct sctp_paddrthlds)))
3517                return -EFAULT;
3518
3519
3520        if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
3521                asoc = sctp_id2assoc(sk, val.spt_assoc_id);
3522                if (!asoc)
3523                        return -ENOENT;
3524                list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3525                                    transports) {
3526                        if (val.spt_pathmaxrxt)
3527                                trans->pathmaxrxt = val.spt_pathmaxrxt;
3528                        trans->pf_retrans = val.spt_pathpfthld;
3529                }
3530
3531                if (val.spt_pathmaxrxt)
3532                        asoc->pathmaxrxt = val.spt_pathmaxrxt;
3533                asoc->pf_retrans = val.spt_pathpfthld;
3534        } else {
3535                trans = sctp_addr_id2transport(sk, &val.spt_address,
3536                                               val.spt_assoc_id);
3537                if (!trans)
3538                        return -ENOENT;
3539
3540                if (val.spt_pathmaxrxt)
3541                        trans->pathmaxrxt = val.spt_pathmaxrxt;
3542                trans->pf_retrans = val.spt_pathpfthld;
3543        }
3544
3545        return 0;
3546}
3547
3548/* API 6.2 setsockopt(), getsockopt()
3549 *
3550 * Applications use setsockopt() and getsockopt() to set or retrieve
3551 * socket options.  Socket options are used to change the default
3552 * behavior of sockets calls.  They are described in Section 7.
3553 *
3554 * The syntax is:
3555 *
3556 *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
3557 *                    int __user *optlen);
3558 *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
3559 *                    int optlen);
3560 *
3561 *   sd      - the socket descript.
3562 *   level   - set to IPPROTO_SCTP for all SCTP options.
3563 *   optname - the option name.
3564 *   optval  - the buffer to store the value of the option.
3565 *   optlen  - the size of the buffer.
3566 */
3567SCTP_STATIC int sctp_setsockopt(struct sock *sk, int level, int optname,
3568                                char __user *optval, unsigned int optlen)
3569{
3570        int retval = 0;
3571
3572        SCTP_DEBUG_PRINTK("sctp_setsockopt(sk: %p... optname: %d)\n",
3573                          sk, optname);
3574
3575        /* I can hardly begin to describe how wrong this is.  This is
3576         * so broken as to be worse than useless.  The API draft
3577         * REALLY is NOT helpful here...  I am not convinced that the
3578         * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
3579         * are at all well-founded.
3580         */
3581        if (level != SOL_SCTP) {
3582                struct sctp_af *af = sctp_sk(sk)->pf->af;
3583                retval = af->setsockopt(sk, level, optname, optval, optlen);
3584                goto out_nounlock;
3585        }
3586
3587        sctp_lock_sock(sk);
3588
3589        switch (optname) {
3590        case SCTP_SOCKOPT_BINDX_ADD:
3591                /* 'optlen' is the size of the addresses buffer. */
3592                retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3593                                               optlen, SCTP_BINDX_ADD_ADDR);
3594                break;
3595
3596        case SCTP_SOCKOPT_BINDX_REM:
3597                /* 'optlen' is the size of the addresses buffer. */
3598                retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
3599                                               optlen, SCTP_BINDX_REM_ADDR);
3600                break;
3601
3602        case SCTP_SOCKOPT_CONNECTX_OLD:
3603                /* 'optlen' is the size of the addresses buffer. */
3604                retval = sctp_setsockopt_connectx_old(sk,
3605                                            (struct sockaddr __user *)optval,
3606                                            optlen);
3607                break;
3608
3609        case SCTP_SOCKOPT_CONNECTX:
3610                /* 'optlen' is the size of the addresses buffer. */
3611                retval = sctp_setsockopt_connectx(sk,
3612                                            (struct sockaddr __user *)optval,
3613                                            optlen);
3614                break;
3615
3616        case SCTP_DISABLE_FRAGMENTS:
3617                retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
3618                break;
3619
3620        case SCTP_EVENTS:
3621                retval = sctp_setsockopt_events(sk, optval, optlen);
3622                break;
3623
3624        case SCTP_AUTOCLOSE:
3625                retval = sctp_setsockopt_autoclose(sk, optval, optlen);
3626                break;
3627
3628        case SCTP_PEER_ADDR_PARAMS:
3629                retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
3630                break;
3631
3632        case SCTP_DELAYED_SACK:
3633                retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
3634                break;
3635        case SCTP_PARTIAL_DELIVERY_POINT:
3636                retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
3637                break;
3638
3639        case SCTP_INITMSG:
3640                retval = sctp_setsockopt_initmsg(sk, optval, optlen);
3641                break;
3642        case SCTP_DEFAULT_SEND_PARAM:
3643                retval = sctp_setsockopt_default_send_param(sk, optval,
3644                                                            optlen);
3645                break;
3646        case SCTP_PRIMARY_ADDR:
3647                retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
3648                break;
3649        case SCTP_SET_PEER_PRIMARY_ADDR:
3650                retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
3651                break;
3652        case SCTP_NODELAY:
3653                retval = sctp_setsockopt_nodelay(sk, optval, optlen);
3654                break;
3655        case SCTP_RTOINFO:
3656                retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
3657                break;
3658        case SCTP_ASSOCINFO:
3659                retval = sctp_setsockopt_associnfo(sk, optval, optlen);
3660                break;
3661        case SCTP_I_WANT_MAPPED_V4_ADDR:
3662                retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
3663                break;
3664        case SCTP_MAXSEG:
3665                retval = sctp_setsockopt_maxseg(sk, optval, optlen);
3666                break;
3667        case SCTP_ADAPTATION_LAYER:
3668                retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
3669                break;
3670        case SCTP_CONTEXT:
3671                retval = sctp_setsockopt_context(sk, optval, optlen);
3672                break;
3673        case SCTP_FRAGMENT_INTERLEAVE:
3674                retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
3675                break;
3676        case SCTP_MAX_BURST:
3677                retval = sctp_setsockopt_maxburst(sk, optval, optlen);
3678                break;
3679        case SCTP_AUTH_CHUNK:
3680                retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
3681                break;
3682        case SCTP_HMAC_IDENT:
3683                retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
3684                break;
3685        case SCTP_AUTH_KEY:
3686                retval = sctp_setsockopt_auth_key(sk, optval, optlen);
3687                break;
3688        case SCTP_AUTH_ACTIVE_KEY:
3689                retval = sctp_setsockopt_active_key(sk, optval, optlen);
3690                break;
3691        case SCTP_AUTH_DELETE_KEY:
3692                retval = sctp_setsockopt_del_key(sk, optval, optlen);
3693                break;
3694        case SCTP_AUTO_ASCONF:
3695                retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
3696                break;
3697        case SCTP_PEER_ADDR_THLDS:
3698                retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
3699                break;
3700        default:
3701                retval = -ENOPROTOOPT;
3702                break;
3703        }
3704
3705        sctp_release_sock(sk);
3706
3707out_nounlock:
3708        return retval;
3709}
3710
3711/* API 3.1.6 connect() - UDP Style Syntax
3712 *
3713 * An application may use the connect() call in the UDP model to initiate an
3714 * association without sending data.
3715 *
3716 * The syntax is:
3717 *
3718 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
3719 *
3720 * sd: the socket descriptor to have a new association added to.
3721 *
3722 * nam: the address structure (either struct sockaddr_in or struct
3723 *    sockaddr_in6 defined in RFC2553 [7]).
3724 *
3725 * len: the size of the address.
3726 */
3727SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
3728                             int addr_len)
3729{
3730        int err = 0;
3731        struct sctp_af *af;
3732
3733        sctp_lock_sock(sk);
3734
3735        SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
3736                          __func__, sk, addr, addr_len);
3737
3738        /* Validate addr_len before calling common connect/connectx routine. */
3739        af = sctp_get_af_specific(addr->sa_family);
3740        if (!af || addr_len < af->sockaddr_len) {
3741                err = -EINVAL;
3742        } else {
3743                /* Pass correct addr len to common routine (so it knows there
3744                 * is only one address being passed.
3745                 */
3746                err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
3747        }
3748
3749        sctp_release_sock(sk);
3750        return err;
3751}
3752
3753/* FIXME: Write comments. */
3754SCTP_STATIC int sctp_disconnect(struct sock *sk, int flags)
3755{
3756        return -EOPNOTSUPP; /* STUB */
3757}
3758
3759/* 4.1.4 accept() - TCP Style Syntax
3760 *
3761 * Applications use accept() call to remove an established SCTP
3762 * association from the accept queue of the endpoint.  A new socket
3763 * descriptor will be returned from accept() to represent the newly
3764 * formed association.
3765 */
3766SCTP_STATIC struct sock *sctp_accept(struct sock *sk, int flags, int *err)
3767{
3768        struct sctp_sock *sp;
3769        struct sctp_endpoint *ep;
3770        struct sock *newsk = NULL;
3771        struct sctp_association *asoc;
3772        long timeo;
3773        int error = 0;
3774
3775        sctp_lock_sock(sk);
3776
3777        sp = sctp_sk(sk);
3778        ep = sp->ep;
3779
3780        if (!sctp_style(sk, TCP)) {
3781                error = -EOPNOTSUPP;
3782                goto out;
3783        }
3784
3785        if (!sctp_sstate(sk, LISTENING)) {
3786                error = -EINVAL;
3787                goto out;
3788        }
3789
3790        timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
3791
3792        error = sctp_wait_for_accept(sk, timeo);
3793        if (error)
3794                goto out;
3795
3796        /* We treat the list of associations on the endpoint as the accept
3797         * queue and pick the first association on the list.
3798         */
3799        asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);
3800
3801        newsk = sp->pf->create_accept_sk(sk, asoc);
3802        if (!newsk) {
3803                error = -ENOMEM;
3804                goto out;
3805        }
3806
3807        /* Populate the fields of the newsk from the oldsk and migrate the
3808         * asoc to the newsk.
3809         */
3810        sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);
3811
3812out:
3813        sctp_release_sock(sk);
3814        *err = error;
3815        return newsk;
3816}
3817
3818/* The SCTP ioctl handler. */
3819SCTP_STATIC int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
3820{
3821        int rc = -ENOTCONN;
3822
3823        sctp_lock_sock(sk);
3824
3825        /*
3826         * SEQPACKET-style sockets in LISTENING state are valid, for
3827         * SCTP, so only discard TCP-style sockets in LISTENING state.
3828         */
3829        if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
3830                goto out;
3831
3832        switch (cmd) {
3833        case SIOCINQ: {
3834                struct sk_buff *skb;
3835                unsigned int amount = 0;
3836
3837                skb = skb_peek(&sk->sk_receive_queue);
3838                if (skb != NULL) {
3839                        /*
3840                         * We will only return the amount of this packet since
3841                         * that is all that will be read.
3842                         */
3843                        amount = skb->len;
3844                }
3845                rc = put_user(amount, (int __user *)arg);
3846                break;
3847        }
3848        default:
3849                rc = -ENOIOCTLCMD;
3850                break;
3851        }
3852out:
3853        sctp_release_sock(sk);
3854        return rc;
3855}
3856
3857/* This is the function which gets called during socket creation to
3858 * initialized the SCTP-specific portion of the sock.
3859 * The sock structure should already be zero-filled memory.
3860 */
3861SCTP_STATIC int sctp_init_sock(struct sock *sk)
3862{
3863        struct net *net = sock_net(sk);
3864        struct sctp_endpoint *ep;
3865        struct sctp_sock *sp;
3866
3867        SCTP_DEBUG_PRINTK("sctp_init_sock(sk: %p)\n", sk);
3868
3869        sp = sctp_sk(sk);
3870
3871        /* Initialize the SCTP per socket area.  */
3872        switch (sk->sk_type) {
3873        case SOCK_SEQPACKET:
3874                sp->type = SCTP_SOCKET_UDP;
3875                break;
3876        case SOCK_STREAM:
3877                sp->type = SCTP_SOCKET_TCP;
3878                break;
3879        default:
3880                return -ESOCKTNOSUPPORT;
3881        }
3882
3883        /* Initialize default send parameters. These parameters can be
3884         * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
3885         */
3886        sp->default_stream = 0;
3887        sp->default_ppid = 0;
3888        sp->default_flags = 0;
3889        sp->default_context = 0;
3890        sp->default_timetolive = 0;
3891
3892        sp->default_rcv_context = 0;
3893        sp->max_burst = net->sctp.max_burst;
3894
3895        sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;
3896
3897        /* Initialize default setup parameters. These parameters
3898         * can be modified with the SCTP_INITMSG socket option or
3899         * overridden by the SCTP_INIT CMSG.
3900         */
3901        sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
3902        sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
3903        sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
3904        sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
3905
3906        /* Initialize default RTO related parameters.  These parameters can
3907         * be modified for with the SCTP_RTOINFO socket option.
3908         */
3909        sp->rtoinfo.srto_initial = net->sctp.rto_initial;
3910        sp->rtoinfo.srto_max     = net->sctp.rto_max;
3911        sp->rtoinfo.srto_min     = net->sctp.rto_min;
3912
3913        /* Initialize default association related parameters. These parameters
3914         * can be modified with the SCTP_ASSOCINFO socket option.
3915         */
3916        sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
3917        sp->assocparams.sasoc_number_peer_destinations = 0;
3918        sp->assocparams.sasoc_peer_rwnd = 0;
3919        sp->assocparams.sasoc_local_rwnd = 0;
3920        sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
3921
3922        /* Initialize default event subscriptions. By default, all the
3923         * options are off.
3924         */
3925        memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));
3926
3927        /* Default Peer Address Parameters.  These defaults can
3928         * be modified via SCTP_PEER_ADDR_PARAMS
3929         */
3930        sp->hbinterval  = net->sctp.hb_interval;
3931        sp->pathmaxrxt  = net->sctp.max_retrans_path;
3932        sp->pathmtu     = 0; // allow default discovery
3933        sp->sackdelay   = net->sctp.sack_timeout;
3934        sp->sackfreq    = 2;
3935        sp->param_flags = SPP_HB_ENABLE |
3936                          SPP_PMTUD_ENABLE |
3937                          SPP_SACKDELAY_ENABLE;
3938
3939        /* If enabled no SCTP message fragmentation will be performed.
3940         * Configure through SCTP_DISABLE_FRAGMENTS socket option.
3941         */
3942        sp->disable_fragments = 0;
3943
3944        /* Enable Nagle algorithm by default.  */
3945        sp->nodelay           = 0;
3946
3947        /* Enable by default. */
3948        sp->v4mapped          = 1;
3949
3950        /* Auto-close idle associations after the configured
3951         * number of seconds.  A value of 0 disables this
3952         * feature.  Configure through the SCTP_AUTOCLOSE socket option,
3953         * for UDP-style sockets only.
3954         */
3955        sp->autoclose         = 0;
3956
3957        /* User specified fragmentation limit. */
3958        sp->user_frag         = 0;
3959
3960        sp->adaptation_ind = 0;
3961
3962        sp->pf = sctp_get_pf_specific(sk->sk_family);
3963
3964        /* Control variables for partial data delivery. */
3965        atomic_set(&sp->pd_mode, 0);
3966        skb_queue_head_init(&sp->pd_lobby);
3967        sp->frag_interleave = 0;
3968
3969        /* Create a per socket endpoint structure.  Even if we
3970         * change the data structure relationships, this may still
3971         * be useful for storing pre-connect address information.
3972         */
3973        ep = sctp_endpoint_new(sk, GFP_KERNEL);
3974        if (!ep)
3975                return -ENOMEM;
3976
3977        sp->ep = ep;
3978        sp->hmac = NULL;
3979
3980        SCTP_DBG_OBJCNT_INC(sock);
3981
3982        local_bh_disable();
3983        percpu_counter_inc(&sctp_sockets_allocated);
3984        sock_prot_inuse_add(net, sk->sk_prot, 1);
3985        if (net->sctp.default_auto_asconf) {
3986                list_add_tail(&sp->auto_asconf_list,
3987                    &net->sctp.auto_asconf_splist);
3988                sp->do_auto_asconf = 1;
3989        } else
3990                sp->do_auto_asconf = 0;
3991        local_bh_enable();
3992
3993        return 0;
3994}
3995
3996/* Cleanup any SCTP per socket resources.  */
3997SCTP_STATIC void sctp_destroy_sock(struct sock *sk)
3998{
3999        struct sctp_sock *sp;
4000
4001        SCTP_DEBUG_PRINTK("sctp_destroy_sock(sk: %p)\n", sk);
4002
4003        /* Release our hold on the endpoint. */
4004        sp = sctp_sk(sk);
4005        if (sp->do_auto_asconf) {
4006                sp->do_auto_asconf = 0;
4007                list_del(&sp->auto_asconf_list);
4008        }
4009        sctp_endpoint_free(sp->ep);
4010        local_bh_disable();
4011        percpu_counter_dec(&sctp_sockets_allocated);
4012        sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4013        local_bh_enable();
4014}
4015
4016/* API 4.1.7 shutdown() - TCP Style Syntax
4017 *     int shutdown(int socket, int how);
4018 *
4019 *     sd      - the socket descriptor of the association to be closed.
4020 *     how     - Specifies the type of shutdown.  The  values  are
4021 *               as follows:
4022 *               SHUT_RD
4023 *                     Disables further receive operations. No SCTP
4024 *                     protocol action is taken.
4025 *               SHUT_WR
4026 *                     Disables further send operations, and initiates
4027 *                     the SCTP shutdown sequence.
4028 *               SHUT_RDWR
4029 *                     Disables further send  and  receive  operations
4030 *                     and initiates the SCTP shutdown sequence.
4031 */
4032SCTP_STATIC void sctp_shutdown(struct sock *sk, int how)
4033{
4034        struct net *net = sock_net(sk);
4035        struct sctp_endpoint *ep;
4036        struct sctp_association *asoc;
4037
4038        if (!sctp_style(sk, TCP))
4039                return;
4040
4041        if (how & SEND_SHUTDOWN) {
4042                ep = sctp_sk(sk)->ep;
4043                if (!list_empty(&ep->asocs)) {
4044                        asoc = list_entry(ep->asocs.next,
4045                                          struct sctp_association, asocs);
4046                        sctp_primitive_SHUTDOWN(net, asoc, NULL);
4047                }
4048        }
4049}
4050
4051/* 7.2.1 Association Status (SCTP_STATUS)
4052
4053 * Applications can retrieve current status information about an
4054 * association, including association state, peer receiver window size,
4055 * number of unacked data chunks, and number of data chunks pending
4056 * receipt.  This information is read-only.
4057 */
4058static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
4059                                       char __user *optval,
4060                                       int __user *optlen)
4061{
4062        struct sctp_status status;
4063        struct sctp_association *asoc = NULL;
4064        struct sctp_transport *transport;
4065        sctp_assoc_t associd;
4066        int retval = 0;
4067
4068        if (len < sizeof(status)) {
4069                retval = -EINVAL;
4070                goto out;
4071        }
4072
4073        len = sizeof(status);
4074        if (copy_from_user(&status, optval, len)) {
4075                retval = -EFAULT;
4076                goto out;
4077        }
4078
4079        associd = status.sstat_assoc_id;
4080        asoc = sctp_id2assoc(sk, associd);
4081        if (!asoc) {
4082                retval = -EINVAL;
4083                goto out;
4084        }
4085
4086        transport = asoc->peer.primary_path;
4087
4088        status.sstat_assoc_id = sctp_assoc2id(asoc);
4089        status.sstat_state = asoc->state;
4090        status.sstat_rwnd =  asoc->peer.rwnd;
4091        status.sstat_unackdata = asoc->unack_data;
4092
4093        status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4094        status.sstat_instrms = asoc->c.sinit_max_instreams;
4095        status.sstat_outstrms = asoc->c.sinit_num_ostreams;
4096        status.sstat_fragmentation_point = asoc->frag_point;
4097        status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4098        memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
4099                        transport->af_specific->sockaddr_len);
4100        /* Map ipv4 address into v4-mapped-on-v6 address.  */
4101        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4102                (union sctp_addr *)&status.sstat_primary.spinfo_address);
4103        status.sstat_primary.spinfo_state = transport->state;
4104        status.sstat_primary.spinfo_cwnd = transport->cwnd;
4105        status.sstat_primary.spinfo_srtt = transport->srtt;
4106        status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4107        status.sstat_primary.spinfo_mtu = transport->pathmtu;
4108
4109        if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
4110                status.sstat_primary.spinfo_state = SCTP_ACTIVE;
4111
4112        if (put_user(len, optlen)) {
4113                retval = -EFAULT;
4114                goto out;
4115        }
4116
4117        SCTP_DEBUG_PRINTK("sctp_getsockopt_sctp_status(%d): %d %d %d\n",
4118                          len, status.sstat_state, status.sstat_rwnd,
4119                          status.sstat_assoc_id);
4120
4121        if (copy_to_user(optval, &status, len)) {
4122                retval = -EFAULT;
4123                goto out;
4124        }
4125
4126out:
4127        return retval;
4128}
4129
4130
4131/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
4132 *
4133 * Applications can retrieve information about a specific peer address
4134 * of an association, including its reachability state, congestion
4135 * window, and retransmission timer values.  This information is
4136 * read-only.
4137 */
4138static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
4139                                          char __user *optval,
4140                                          int __user *optlen)
4141{
4142        struct sctp_paddrinfo pinfo;
4143        struct sctp_transport *transport;
4144        int retval = 0;
4145
4146        if (len < sizeof(pinfo)) {
4147                retval = -EINVAL;
4148                goto out;
4149        }
4150
4151        len = sizeof(pinfo);
4152        if (copy_from_user(&pinfo, optval, len)) {
4153                retval = -EFAULT;
4154                goto out;
4155        }
4156
4157        transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
4158                                           pinfo.spinfo_assoc_id);
4159        if (!transport)
4160                return -EINVAL;
4161
4162        pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4163        pinfo.spinfo_state = transport->state;
4164        pinfo.spinfo_cwnd = transport->cwnd;
4165        pinfo.spinfo_srtt = transport->srtt;
4166        pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4167        pinfo.spinfo_mtu = transport->pathmtu;
4168
4169        if (pinfo.spinfo_state == SCTP_UNKNOWN)
4170                pinfo.spinfo_state = SCTP_ACTIVE;
4171
4172        if (put_user(len, optlen)) {
4173                retval = -EFAULT;
4174                goto out;
4175        }
4176
4177        if (copy_to_user(optval, &pinfo, len)) {
4178                retval = -EFAULT;
4179                goto out;
4180        }
4181
4182out:
4183        return retval;
4184}
4185
4186/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
4187 *
4188 * This option is a on/off flag.  If enabled no SCTP message
4189 * fragmentation will be performed.  Instead if a message being sent
4190 * exceeds the current PMTU size, the message will NOT be sent and
4191 * instead a error will be indicated to the user.
4192 */
4193static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
4194                                        char __user *optval, int __user *optlen)
4195{
4196        int val;
4197
4198        if (len < sizeof(int))
4199                return -EINVAL;
4200
4201        len = sizeof(int);
4202        val = (sctp_sk(sk)->disable_fragments == 1);
4203        if (put_user(len, optlen))
4204                return -EFAULT;
4205        if (copy_to_user(optval, &val, len))
4206                return -EFAULT;
4207        return 0;
4208}
4209
4210/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
4211 *
4212 * This socket option is used to specify various notifications and
4213 * ancillary data the user wishes to receive.
4214 */
4215static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
4216                                  int __user *optlen)
4217{
4218        if (len <= 0)
4219                return -EINVAL;
4220        if (len > sizeof(struct sctp_event_subscribe))
4221                len = sizeof(struct sctp_event_subscribe);
4222        if (put_user(len, optlen))
4223                return -EFAULT;
4224        if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
4225                return -EFAULT;
4226        return 0;
4227}
4228
4229/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
4230 *
4231 * This socket option is applicable to the UDP-style socket only.  When
4232 * set it will cause associations that are idle for more than the
4233 * specified number of seconds to automatically close.  An association
4234 * being idle is defined an association that has NOT sent or received
4235 * user data.  The special value of '0' indicates that no automatic
4236 * close of any associations should be performed.  The option expects an
4237 * integer defining the number of seconds of idle time before an
4238 * association is closed.
4239 */
4240static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
4241{
4242        /* Applicable to UDP-style socket only */
4243        if (sctp_style(sk, TCP))
4244                return -EOPNOTSUPP;
4245        if (len < sizeof(int))
4246                return -EINVAL;
4247        len = sizeof(int);
4248        if (put_user(len, optlen))
4249                return -EFAULT;
4250        if (copy_to_user(optval, &sctp_sk(sk)->autoclose, sizeof(int)))
4251                return -EFAULT;
4252        return 0;
4253}
4254
4255/* Helper routine to branch off an association to a new socket.  */
4256int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
4257{
4258        struct sctp_association *asoc = sctp_id2assoc(sk, id);
4259        struct socket *sock;
4260        struct sctp_af *af;
4261        int err = 0;
4262
4263        if (!asoc)
4264                return -EINVAL;
4265
4266        /* An association cannot be branched off from an already peeled-off
4267         * socket, nor is this supported for tcp style sockets.
4268         */
4269        if (!sctp_style(sk, UDP))
4270                return -EINVAL;
4271
4272        /* Create a new socket.  */
4273        err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
4274        if (err < 0)
4275                return err;
4276
4277        sctp_copy_sock(sock->sk, sk, asoc);
4278
4279        /* Make peeled-off sockets more like 1-1 accepted sockets.
4280         * Set the daddr and initialize id to something more random
4281         */
4282        af = sctp_get_af_specific(asoc->peer.primary_addr.sa.sa_family);
4283        af->to_sk_daddr(&asoc->peer.primary_addr, sk);
4284
4285        /* Populate the fields of the newsk from the oldsk and migrate the
4286         * asoc to the newsk.
4287         */
4288        sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
4289
4290        *sockp = sock;
4291
4292        return err;
4293}
4294EXPORT_SYMBOL(sctp_do_peeloff);
4295
4296static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
4297{
4298        sctp_peeloff_arg_t peeloff;
4299        struct socket *newsock;
4300        struct file *newfile;
4301        int retval = 0;
4302
4303        if (len < sizeof(sctp_peeloff_arg_t))
4304                return -EINVAL;
4305        len = sizeof(sctp_peeloff_arg_t);
4306        if (copy_from_user(&peeloff, optval, len))
4307                return -EFAULT;
4308
4309        retval = sctp_do_peeloff(sk, peeloff.associd, &newsock);
4310        if (retval < 0)
4311                goto out;
4312
4313        /* Map the socket to an unused fd that can be returned to the user.  */
4314        retval = get_unused_fd();
4315        if (retval < 0) {
4316                sock_release(newsock);
4317                goto out;
4318        }
4319
4320        newfile = sock_alloc_file(newsock, 0, NULL);
4321        if (unlikely(IS_ERR(newfile))) {
4322                put_unused_fd(retval);
4323                sock_release(newsock);
4324                return PTR_ERR(newfile);
4325        }
4326
4327        SCTP_DEBUG_PRINTK("%s: sk: %p newsk: %p sd: %d\n",
4328                          __func__, sk, newsock->sk, retval);
4329
4330        /* Return the fd mapped to the new socket.  */
4331        if (put_user(len, optlen)) {
4332                fput(newfile);
4333                put_unused_fd(retval);
4334                return -EFAULT;
4335        }
4336        peeloff.sd = retval;
4337        if (copy_to_user(optval, &peeloff, len)) {
4338                fput(newfile);
4339                put_unused_fd(retval);
4340                return -EFAULT;
4341        }
4342        fd_install(retval, newfile);
4343out:
4344        return retval;
4345}
4346
4347/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
4348 *
4349 * Applications can enable or disable heartbeats for any peer address of
4350 * an association, modify an address's heartbeat interval, force a
4351 * heartbeat to be sent immediately, and adjust the address's maximum
4352 * number of retransmissions sent before an address is considered
4353 * unreachable.  The following structure is used to access and modify an
4354 * address's parameters:
4355 *
4356 *  struct sctp_paddrparams {
4357 *     sctp_assoc_t            spp_assoc_id;
4358 *     struct sockaddr_storage spp_address;
4359 *     uint32_t                spp_hbinterval;
4360 *     uint16_t                spp_pathmaxrxt;
4361 *     uint32_t                spp_pathmtu;
4362 *     uint32_t                spp_sackdelay;
4363 *     uint32_t                spp_flags;
4364 * };
4365 *
4366 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
4367 *                     application, and identifies the association for
4368 *                     this query.
4369 *   spp_address     - This specifies which address is of interest.
4370 *   spp_hbinterval  - This contains the value of the heartbeat interval,
4371 *                     in milliseconds.  If a  value of zero
4372 *                     is present in this field then no changes are to
4373 *                     be made to this parameter.
4374 *   spp_pathmaxrxt  - This contains the maximum number of
4375 *                     retransmissions before this address shall be
4376 *                     considered unreachable. If a  value of zero
4377 *                     is present in this field then no changes are to
4378 *                     be made to this parameter.
4379 *   spp_pathmtu     - When Path MTU discovery is disabled the value
4380 *                     specified here will be the "fixed" path mtu.
4381 *                     Note that if the spp_address field is empty
4382 *                     then all associations on this address will
4383 *                     have this fixed path mtu set upon them.
4384 *
4385 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
4386 *                     the number of milliseconds that sacks will be delayed
4387 *                     for. This value will apply to all addresses of an
4388 *                     association if the spp_address field is empty. Note
4389 *                     also, that if delayed sack is enabled and this
4390 *                     value is set to 0, no change is made to the last
4391 *                     recorded delayed sack timer value.
4392 *
4393 *   spp_flags       - These flags are used to control various features
4394 *                     on an association. The flag field may contain
4395 *                     zero or more of the following options.
4396 *
4397 *                     SPP_HB_ENABLE  - Enable heartbeats on the
4398 *                     specified address. Note that if the address
4399 *                     field is empty all addresses for the association
4400 *                     have heartbeats enabled upon them.
4401 *
4402 *                     SPP_HB_DISABLE - Disable heartbeats on the
4403 *                     speicifed address. Note that if the address
4404 *                     field is empty all addresses for the association
4405 *                     will have their heartbeats disabled. Note also
4406 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
4407 *                     mutually exclusive, only one of these two should
4408 *                     be specified. Enabling both fields will have
4409 *                     undetermined results.
4410 *
4411 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
4412 *                     to be made immediately.
4413 *
4414 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
4415 *                     discovery upon the specified address. Note that
4416 *                     if the address feild is empty then all addresses
4417 *                     on the association are effected.
4418 *
4419 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
4420 *                     discovery upon the specified address. Note that
4421 *                     if the address feild is empty then all addresses
4422 *                     on the association are effected. Not also that
4423 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
4424 *                     exclusive. Enabling both will have undetermined
4425 *                     results.
4426 *
4427 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
4428 *                     on delayed sack. The time specified in spp_sackdelay
4429 *                     is used to specify the sack delay for this address. Note
4430 *                     that if spp_address is empty then all addresses will
4431 *                     enable delayed sack and take on the sack delay
4432 *                     value specified in spp_sackdelay.
4433 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
4434 *                     off delayed sack. If the spp_address field is blank then
4435 *                     delayed sack is disabled for the entire association. Note
4436 *                     also that this field is mutually exclusive to
4437 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
4438 *                     results.
4439 */
4440static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
4441                                            char __user *optval, int __user *optlen)
4442{
4443        struct sctp_paddrparams  params;
4444        struct sctp_transport   *trans = NULL;
4445        struct sctp_association *asoc = NULL;
4446        struct sctp_sock        *sp = sctp_sk(sk);
4447
4448        if (len < sizeof(struct sctp_paddrparams))
4449                return -EINVAL;
4450        len = sizeof(struct sctp_paddrparams);
4451        if (copy_from_user(&params, optval, len))
4452                return -EFAULT;
4453
4454        /* If an address other than INADDR_ANY is specified, and
4455         * no transport is found, then the request is invalid.
4456         */
4457        if (!sctp_is_any(sk, ( union sctp_addr *)&params.spp_address)) {
4458                trans = sctp_addr_id2transport(sk, &params.spp_address,
4459                                               params.spp_assoc_id);
4460                if (!trans) {
4461                        SCTP_DEBUG_PRINTK("Failed no transport\n");
4462                        return -EINVAL;
4463                }
4464        }
4465
4466        /* Get association, if assoc_id != 0 and the socket is a one
4467         * to many style socket, and an association was not found, then
4468         * the id was invalid.
4469         */
4470        asoc = sctp_id2assoc(sk, params.spp_assoc_id);
4471        if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
4472                SCTP_DEBUG_PRINTK("Failed no association\n");
4473                return -EINVAL;
4474        }
4475
4476        if (trans) {
4477                /* Fetch transport values. */
4478                params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
4479                params.spp_pathmtu    = trans->pathmtu;
4480                params.spp_pathmaxrxt = trans->pathmaxrxt;
4481                params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);
4482
4483                /*draft-11 doesn't say what to return in spp_flags*/
4484                params.spp_flags      = trans->param_flags;
4485        } else if (asoc) {
4486                /* Fetch association values. */
4487                params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
4488                params.spp_pathmtu    = asoc->pathmtu;
4489                params.spp_pathmaxrxt = asoc->pathmaxrxt;
4490                params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);
4491
4492                /*draft-11 doesn't say what to return in spp_flags*/
4493                params.spp_flags      = asoc->param_flags;
4494        } else {
4495                /* Fetch socket values. */
4496                params.spp_hbinterval = sp->hbinterval;
4497                params.spp_pathmtu    = sp->pathmtu;
4498                params.spp_sackdelay  = sp->sackdelay;
4499                params.spp_pathmaxrxt = sp->pathmaxrxt;
4500
4501                /*draft-11 doesn't say what to return in spp_flags*/
4502                params.spp_flags      = sp->param_flags;
4503        }
4504
4505        if (copy_to_user(optval, &params, len))
4506                return -EFAULT;
4507
4508        if (put_user(len, optlen))
4509                return -EFAULT;
4510
4511        return 0;
4512}
4513
4514/*
4515 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
4516 *
4517 * This option will effect the way delayed acks are performed.  This
4518 * option allows you to get or set the delayed ack time, in
4519 * milliseconds.  It also allows changing the delayed ack frequency.
4520 * Changing the frequency to 1 disables the delayed sack algorithm.  If
4521 * the assoc_id is 0, then this sets or gets the endpoints default
4522 * values.  If the assoc_id field is non-zero, then the set or get
4523 * effects the specified association for the one to many model (the
4524 * assoc_id field is ignored by the one to one model).  Note that if
4525 * sack_delay or sack_freq are 0 when setting this option, then the
4526 * current values will remain unchanged.
4527 *
4528 * struct sctp_sack_info {
4529 *     sctp_assoc_t            sack_assoc_id;
4530 *     uint32_t                sack_delay;
4531 *     uint32_t                sack_freq;
4532 * };
4533 *
4534 * sack_assoc_id -  This parameter, indicates which association the user
4535 *    is performing an action upon.  Note that if this field's value is
4536 *    zero then the endpoints default value is changed (effecting future
4537 *    associations only).
4538 *
4539 * sack_delay -  This parameter contains the number of milliseconds that
4540 *    the user is requesting the delayed ACK timer be set to.  Note that
4541 *    this value is defined in the standard to be between 200 and 500
4542 *    milliseconds.
4543 *
4544 * sack_freq -  This parameter contains the number of packets that must
4545 *    be received before a sack is sent without waiting for the delay
4546 *    timer to expire.  The default value for this is 2, setting this
4547 *    value to 1 will disable the delayed sack algorithm.
4548 */
4549static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
4550                                            char __user *optval,
4551                                            int __user *optlen)
4552{
4553        struct sctp_sack_info    params;
4554        struct sctp_association *asoc = NULL;
4555        struct sctp_sock        *sp = sctp_sk(sk);
4556
4557        if (len >= sizeof(struct sctp_sack_info)) {
4558                len = sizeof(struct sctp_sack_info);
4559
4560                if (copy_from_user(&params, optval, len))
4561                        return -EFAULT;
4562        } else if (len == sizeof(struct sctp_assoc_value)) {
4563                pr_warn("Use of struct sctp_assoc_value in delayed_ack socket option deprecated\n");
4564                pr_warn("Use struct sctp_sack_info instead\n");
4565                if (copy_from_user(&params, optval, len))
4566                        return -EFAULT;
4567        } else
4568                return - EINVAL;
4569
4570        /* Get association, if sack_assoc_id != 0 and the socket is a one
4571         * to many style socket, and an association was not found, then
4572         * the id was invalid.
4573         */
4574        asoc = sctp_id2assoc(sk, params.sack_assoc_id);
4575        if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
4576                return -EINVAL;
4577
4578        if (asoc) {
4579                /* Fetch association values. */
4580                if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
4581                        params.sack_delay = jiffies_to_msecs(
4582                                asoc->sackdelay);
4583                        params.sack_freq = asoc->sackfreq;
4584
4585                } else {
4586                        params.sack_delay = 0;
4587                        params.sack_freq = 1;
4588                }
4589        } else {
4590                /* Fetch socket values. */
4591                if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
4592                        params.sack_delay  = sp->sackdelay;
4593                        params.sack_freq = sp->sackfreq;
4594                } else {
4595                        params.sack_delay  = 0;
4596                        params.sack_freq = 1;
4597                }
4598        }
4599
4600        if (copy_to_user(optval, &params, len))
4601                return -EFAULT;
4602
4603        if (put_user(len, optlen))
4604                return -EFAULT;
4605
4606        return 0;
4607}
4608
4609/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
4610 *
4611 * Applications can specify protocol parameters for the default association
4612 * initialization.  The option name argument to setsockopt() and getsockopt()
4613 * is SCTP_INITMSG.
4614 *
4615 * Setting initialization parameters is effective only on an unconnected
4616 * socket (for UDP-style sockets only future associations are effected
4617 * by the change).  With TCP-style sockets, this option is inherited by
4618 * sockets derived from a listener socket.
4619 */
4620static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
4621{
4622        if (len < sizeof(struct sctp_initmsg))
4623                return -EINVAL;
4624        len = sizeof(struct sctp_initmsg);
4625        if (put_user(len, optlen))
4626                return -EFAULT;
4627        if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
4628                return -EFAULT;
4629        return 0;
4630}
4631
4632
4633static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
4634                                      char __user *optval, int __user *optlen)
4635{
4636        struct sctp_association *asoc;
4637        int cnt = 0;
4638        struct sctp_getaddrs getaddrs;
4639        struct sctp_transport *from;
4640        void __user *to;
4641        union sctp_addr temp;
4642        struct sctp_sock *sp = sctp_sk(sk);
4643        int addrlen;
4644        size_t space_left;
4645        int bytes_copied;
4646
4647        if (len < sizeof(struct sctp_getaddrs))
4648                return -EINVAL;
4649
4650        if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4651                return -EFAULT;
4652
4653        /* For UDP-style sockets, id specifies the association to query.  */
4654        asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4655        if (!asoc)
4656                return -EINVAL;
4657
4658        to = optval + offsetof(struct sctp_getaddrs,addrs);
4659        space_left = len - offsetof(struct sctp_getaddrs,addrs);
4660
4661        list_for_each_entry(from, &asoc->peer.transport_addr_list,
4662                                transports) {
4663                memcpy(&temp, &from->ipaddr, sizeof(temp));
4664                sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4665                addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4666                if (space_left < addrlen)
4667                        return -ENOMEM;
4668                if (copy_to_user(to, &temp, addrlen))
4669                        return -EFAULT;
4670                to += addrlen;
4671                cnt++;
4672                space_left -= addrlen;
4673        }
4674
4675        if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
4676                return -EFAULT;
4677        bytes_copied = ((char __user *)to) - optval;
4678        if (put_user(bytes_copied, optlen))
4679                return -EFAULT;
4680
4681        return 0;
4682}
4683
4684static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
4685                            size_t space_left, int *bytes_copied)
4686{
4687        struct sctp_sockaddr_entry *addr;
4688        union sctp_addr temp;
4689        int cnt = 0;
4690        int addrlen;
4691        struct net *net = sock_net(sk);
4692
4693        rcu_read_lock();
4694        list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
4695                if (!addr->valid)
4696                        continue;
4697
4698                if ((PF_INET == sk->sk_family) &&
4699                    (AF_INET6 == addr->a.sa.sa_family))
4700                        continue;
4701                if ((PF_INET6 == sk->sk_family) &&
4702                    inet_v6_ipv6only(sk) &&
4703                    (AF_INET == addr->a.sa.sa_family))
4704                        continue;
4705                memcpy(&temp, &addr->a, sizeof(temp));
4706                if (!temp.v4.sin_port)
4707                        temp.v4.sin_port = htons(port);
4708
4709                sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
4710                                                                &temp);
4711                addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4712                if (space_left < addrlen) {
4713                        cnt =  -ENOMEM;
4714                        break;
4715                }
4716                memcpy(to, &temp, addrlen);
4717
4718                to += addrlen;
4719                cnt ++;
4720                space_left -= addrlen;
4721                *bytes_copied += addrlen;
4722        }
4723        rcu_read_unlock();
4724
4725        return cnt;
4726}
4727
4728
4729static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
4730                                       char __user *optval, int __user *optlen)
4731{
4732        struct sctp_bind_addr *bp;
4733        struct sctp_association *asoc;
4734        int cnt = 0;
4735        struct sctp_getaddrs getaddrs;
4736        struct sctp_sockaddr_entry *addr;
4737        void __user *to;
4738        union sctp_addr temp;
4739        struct sctp_sock *sp = sctp_sk(sk);
4740        int addrlen;
4741        int err = 0;
4742        size_t space_left;
4743        int bytes_copied = 0;
4744        void *addrs;
4745        void *buf;
4746
4747        if (len < sizeof(struct sctp_getaddrs))
4748                return -EINVAL;
4749
4750        if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
4751                return -EFAULT;
4752
4753        /*
4754         *  For UDP-style sockets, id specifies the association to query.
4755         *  If the id field is set to the value '0' then the locally bound
4756         *  addresses are returned without regard to any particular
4757         *  association.
4758         */
4759        if (0 == getaddrs.assoc_id) {
4760                bp = &sctp_sk(sk)->ep->base.bind_addr;
4761        } else {
4762                asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
4763                if (!asoc)
4764                        return -EINVAL;
4765                bp = &asoc->base.bind_addr;
4766        }
4767
4768        to = optval + offsetof(struct sctp_getaddrs,addrs);
4769        space_left = len - offsetof(struct sctp_getaddrs,addrs);
4770
4771        addrs = kmalloc(space_left, GFP_KERNEL);
4772        if (!addrs)
4773                return -ENOMEM;
4774
4775        /* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
4776         * addresses from the global local address list.
4777         */
4778        if (sctp_list_single_entry(&bp->address_list)) {
4779                addr = list_entry(bp->address_list.next,
4780                                  struct sctp_sockaddr_entry, list);
4781                if (sctp_is_any(sk, &addr->a)) {
4782                        cnt = sctp_copy_laddrs(sk, bp->port, addrs,
4783                                                space_left, &bytes_copied);
4784                        if (cnt < 0) {
4785                                err = cnt;
4786                                goto out;
4787                        }
4788                        goto copy_getaddrs;
4789                }
4790        }
4791
4792        buf = addrs;
4793        /* Protection on the bound address list is not needed since
4794         * in the socket option context we hold a socket lock and
4795         * thus the bound address list can't change.
4796         */
4797        list_for_each_entry(addr, &bp->address_list, list) {
4798                memcpy(&temp, &addr->a, sizeof(temp));
4799                sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp, &temp);
4800                addrlen = sctp_get_af_specific(temp.sa.sa_family)->sockaddr_len;
4801                if (space_left < addrlen) {
4802                        err =  -ENOMEM; /*fixme: right error?*/
4803                        goto out;
4804                }
4805                memcpy(buf, &temp, addrlen);
4806                buf += addrlen;
4807                bytes_copied += addrlen;
4808                cnt ++;
4809                space_left -= addrlen;
4810        }
4811
4812copy_getaddrs:
4813        if (copy_to_user(to, addrs, bytes_copied)) {
4814                err = -EFAULT;
4815                goto out;
4816        }
4817        if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
4818                err = -EFAULT;
4819                goto out;
4820        }
4821        if (put_user(bytes_copied, optlen))
4822                err = -EFAULT;
4823out:
4824        kfree(addrs);
4825        return err;
4826}
4827
4828/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
4829 *
4830 * Requests that the local SCTP stack use the enclosed peer address as
4831 * the association primary.  The enclosed address must be one of the
4832 * association peer's addresses.
4833 */
4834static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
4835                                        char __user *optval, int __user *optlen)
4836{
4837        struct sctp_prim prim;
4838        struct sctp_association *asoc;
4839        struct sctp_sock *sp = sctp_sk(sk);
4840
4841        if (len < sizeof(struct sctp_prim))
4842                return -EINVAL;
4843
4844        len = sizeof(struct sctp_prim);
4845
4846        if (copy_from_user(&prim, optval, len))
4847                return -EFAULT;
4848
4849        asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
4850        if (!asoc)
4851                return -EINVAL;
4852
4853        if (!asoc->peer.primary_path)
4854                return -ENOTCONN;
4855
4856        memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
4857                asoc->peer.primary_path->af_specific->sockaddr_len);
4858
4859        sctp_get_pf_specific(sk->sk_family)->addr_v4map(sp,
4860                        (union sctp_addr *)&prim.ssp_addr);
4861
4862        if (put_user(len, optlen))
4863                return -EFAULT;
4864        if (copy_to_user(optval, &prim, len))
4865                return -EFAULT;
4866
4867        return 0;
4868}
4869
4870/*
4871 * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
4872 *
4873 * Requests that the local endpoint set the specified Adaptation Layer
4874 * Indication parameter for all future INIT and INIT-ACK exchanges.
4875 */
4876static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
4877                                  char __user *optval, int __user *optlen)
4878{
4879        struct sctp_setadaptation adaptation;
4880
4881        if (len < sizeof(struct sctp_setadaptation))
4882                return -EINVAL;
4883
4884        len = sizeof(struct sctp_setadaptation);
4885
4886        adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
4887
4888        if (put_user(len, optlen))
4889                return -EFAULT;
4890        if (copy_to_user(optval, &adaptation, len))
4891                return -EFAULT;
4892
4893        return 0;
4894}
4895
4896/*
4897 *
4898 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
4899 *
4900 *   Applications that wish to use the sendto() system call may wish to
4901 *   specify a default set of parameters that would normally be supplied
4902 *   through the inclusion of ancillary data.  This socket option allows
4903 *   such an application to set the default sctp_sndrcvinfo structure.
4904
4905
4906 *   The application that wishes to use this socket option simply passes
4907 *   in to this call the sctp_sndrcvinfo structure defined in Section
4908 *   5.2.2) The input parameters accepted by this call include
4909 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
4910 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
4911 *   to this call if the caller is using the UDP model.
4912 *
4913 *   For getsockopt, it get the default sctp_sndrcvinfo structure.
4914 */
4915static int sctp_getsockopt_default_send_param(struct sock *sk,
4916                                        int len, char __user *optval,
4917                                        int __user *optlen)
4918{
4919        struct sctp_sndrcvinfo info;
4920        struct sctp_association *asoc;
4921        struct sctp_sock *sp = sctp_sk(sk);
4922
4923        if (len < sizeof(struct sctp_sndrcvinfo))
4924                return -EINVAL;
4925
4926        len = sizeof(struct sctp_sndrcvinfo);
4927
4928        if (copy_from_user(&info, optval, len))
4929                return -EFAULT;
4930
4931        asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
4932        if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
4933                return -EINVAL;
4934
4935        if (asoc) {
4936                info.sinfo_stream = asoc->default_stream;
4937                info.sinfo_flags = asoc->default_flags;
4938                info.sinfo_ppid = asoc->default_ppid;
4939                info.sinfo_context = asoc->default_context;
4940                info.sinfo_timetolive = asoc->default_timetolive;
4941        } else {
4942                info.sinfo_stream = sp->default_stream;
4943                info.sinfo_flags = sp->default_flags;
4944                info.sinfo_ppid = sp->default_ppid;
4945                info.sinfo_context = sp->default_context;
4946                info.sinfo_timetolive = sp->default_timetolive;
4947        }
4948
4949        if (put_user(len, optlen))
4950                return -EFAULT;
4951        if (copy_to_user(optval, &info, len))
4952                return -EFAULT;
4953
4954        return 0;
4955}
4956
4957/*
4958 *
4959 * 7.1.5 SCTP_NODELAY
4960 *
4961 * Turn on/off any Nagle-like algorithm.  This means that packets are
4962 * generally sent as soon as possible and no unnecessary delays are
4963 * introduced, at the cost of more packets in the network.  Expects an
4964 * integer boolean flag.
4965 */
4966
4967static int sctp_getsockopt_nodelay(struct sock *sk, int len,
4968                                   char __user *optval, int __user *optlen)
4969{
4970        int val;
4971
4972        if (len < sizeof(int))
4973                return -EINVAL;
4974
4975        len = sizeof(int);
4976        val = (sctp_sk(sk)->nodelay == 1);
4977        if (put_user(len, optlen))
4978                return -EFAULT;
4979        if (copy_to_user(optval, &val, len))
4980                return -EFAULT;
4981        return 0;
4982}
4983
4984/*
4985 *
4986 * 7.1.1 SCTP_RTOINFO
4987 *
4988 * The protocol parameters used to initialize and bound retransmission
4989 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
4990 * and modify these parameters.
4991 * All parameters are time values, in milliseconds.  A value of 0, when
4992 * modifying the parameters, indicates that the current value should not
4993 * be changed.
4994 *
4995 */
4996static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
4997                                char __user *optval,
4998                                int __user *optlen) {
4999        struct sctp_rtoinfo rtoinfo;
5000        struct sctp_association *asoc;
5001
5002        if (len < sizeof (struct sctp_rtoinfo))
5003                return -EINVAL;
5004
5005        len = sizeof(struct sctp_rtoinfo);
5006
5007        if (copy_from_user(&rtoinfo, optval, len))
5008                return -EFAULT;
5009
5010        asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);
5011
5012        if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
5013                return -EINVAL;
5014
5015        /* Values corresponding to the specific association. */
5016        if (asoc) {
5017                rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
5018                rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
5019                rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
5020        } else {
5021                /* Values corresponding to the endpoint. */
5022                struct sctp_sock *sp = sctp_sk(sk);
5023
5024                rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
5025                rtoinfo.srto_max = sp->rtoinfo.srto_max;
5026                rtoinfo.srto_min = sp->rtoinfo.srto_min;
5027        }
5028
5029        if (put_user(len, optlen))
5030                return -EFAULT;
5031
5032        if (copy_to_user(optval, &rtoinfo, len))
5033                return -EFAULT;
5034
5035        return 0;
5036}
5037
5038/*
5039 *
5040 * 7.1.2 SCTP_ASSOCINFO
5041 *
5042 * This option is used to tune the maximum retransmission attempts
5043 * of the association.
5044 * Returns an error if the new association retransmission value is
5045 * greater than the sum of the retransmission value  of the peer.
5046 * See [SCTP] for more information.
5047 *
5048 */
5049static int sctp_getsockopt_associnfo(struct sock *sk, int len,
5050                                     char __user *optval,
5051                                     int __user *optlen)
5052{
5053
5054        struct sctp_assocparams assocparams;
5055        struct sctp_association *asoc;
5056        struct list_head *pos;
5057        int cnt = 0;
5058
5059        if (len < sizeof (struct sctp_assocparams))
5060                return -EINVAL;
5061
5062        len = sizeof(struct sctp_assocparams);
5063
5064        if (copy_from_user(&assocparams, optval, len))
5065                return -EFAULT;
5066
5067        asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);
5068
5069        if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
5070                return -EINVAL;
5071
5072        /* Values correspoinding to the specific association */
5073        if (asoc) {
5074                assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
5075                assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
5076                assocparams.sasoc_local_rwnd = asoc->a_rwnd;
5077                assocparams.sasoc_cookie_life = (asoc->cookie_life.tv_sec
5078                                                * 1000) +
5079                                                (asoc->cookie_life.tv_usec
5080                                                / 1000);
5081
5082                list_for_each(pos, &asoc->peer.transport_addr_list) {
5083                        cnt ++;
5084                }
5085
5086                assocparams.sasoc_number_peer_destinations = cnt;
5087        } else {
5088                /* Values corresponding to the endpoint */
5089                struct sctp_sock *sp = sctp_sk(sk);
5090
5091                assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
5092                assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
5093                assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
5094                assocparams.sasoc_cookie_life =
5095                                        sp->assocparams.sasoc_cookie_life;
5096                assocparams.sasoc_number_peer_destinations =
5097                                        sp->assocparams.
5098                                        sasoc_number_peer_destinations;
5099        }
5100
5101        if (put_user(len, optlen))
5102                return -EFAULT;
5103
5104        if (copy_to_user(optval, &assocparams, len))
5105                return -EFAULT;
5106
5107        return 0;
5108}
5109
5110/*
5111 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
5112 *
5113 * This socket option is a boolean flag which turns on or off mapped V4
5114 * addresses.  If this option is turned on and the socket is type
5115 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
5116 * If this option is turned off, then no mapping will be done of V4
5117 * addresses and a user will receive both PF_INET6 and PF_INET type
5118 * addresses on the socket.
5119 */
5120static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
5121                                    char __user *optval, int __user *optlen)
5122{
5123        int val;
5124        struct sctp_sock *sp = sctp_sk(sk);
5125
5126        if (len < sizeof(int))
5127                return -EINVAL;
5128
5129        len = sizeof(int);
5130        val = sp->v4mapped;
5131        if (put_user(len, optlen))
5132                return -EFAULT;
5133        if (copy_to_user(optval, &val, len))
5134                return -EFAULT;
5135
5136        return 0;
5137}
5138
5139/*
5140 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
5141 * (chapter and verse is quoted at sctp_setsockopt_context())
5142 */
5143static int sctp_getsockopt_context(struct sock *sk, int len,
5144                                   char __user *optval, int __user *optlen)
5145{
5146        struct sctp_assoc_value params;
5147        struct sctp_sock *sp;
5148        struct sctp_association *asoc;
5149
5150        if (len < sizeof(struct sctp_assoc_value))
5151                return -EINVAL;
5152
5153        len = sizeof(struct sctp_assoc_value);
5154
5155        if (copy_from_user(&params, optval, len))
5156                return -EFAULT;
5157
5158        sp = sctp_sk(sk);
5159
5160        if (params.assoc_id != 0) {
5161                asoc = sctp_id2assoc(sk, params.assoc_id);
5162                if (!asoc)
5163                        return -EINVAL;
5164                params.assoc_value = asoc->default_rcv_context;
5165        } else {
5166                params.assoc_value = sp->default_rcv_context;
5167        }
5168
5169        if (put_user(len, optlen))
5170                return -EFAULT;
5171        if (copy_to_user(optval, &params, len))
5172                return -EFAULT;
5173
5174        return 0;
5175}
5176
5177/*
5178 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
5179 * This option will get or set the maximum size to put in any outgoing
5180 * SCTP DATA chunk.  If a message is larger than this size it will be
5181 * fragmented by SCTP into the specified size.  Note that the underlying
5182 * SCTP implementation may fragment into smaller sized chunks when the
5183 * PMTU of the underlying association is smaller than the value set by
5184 * the user.  The default value for this option is '0' which indicates
5185 * the user is NOT limiting fragmentation and only the PMTU will effect
5186 * SCTP's choice of DATA chunk size.  Note also that values set larger
5187 * than the maximum size of an IP datagram will effectively let SCTP
5188 * control fragmentation (i.e. the same as setting this option to 0).
5189 *
5190 * The following structure is used to access and modify this parameter:
5191 *
5192 * struct sctp_assoc_value {
5193 *   sctp_assoc_t assoc_id;
5194 *   uint32_t assoc_value;
5195 * };
5196 *
5197 * assoc_id:  This parameter is ignored for one-to-one style sockets.
5198 *    For one-to-many style sockets this parameter indicates which
5199 *    association the user is performing an action upon.  Note that if
5200 *    this field's value is zero then the endpoints default value is
5201 *    changed (effecting future associations only).
5202 * assoc_value:  This parameter specifies the maximum size in bytes.
5203 */
5204static int sctp_getsockopt_maxseg(struct sock *sk, int len,
5205                                  char __user *optval, int __user *optlen)
5206{
5207        struct sctp_assoc_value params;
5208        struct sctp_association *asoc;
5209
5210        if (len == sizeof(int)) {
5211                pr_warn("Use of int in maxseg socket option deprecated\n");
5212                pr_warn("Use struct sctp_assoc_value instead\n");
5213                params.assoc_id = 0;
5214        } else if (len >= sizeof(struct sctp_assoc_value)) {
5215                len = sizeof(struct sctp_assoc_value);
5216                if (copy_from_user(&params, optval, sizeof(params)))
5217                        return -EFAULT;
5218        } else
5219                return -EINVAL;
5220
5221        asoc = sctp_id2assoc(sk, params.assoc_id);
5222        if (!asoc && params.assoc_id && sctp_style(sk, UDP))
5223                return -EINVAL;
5224
5225        if (asoc)
5226                params.assoc_value = asoc->frag_point;
5227        else
5228                params.assoc_value = sctp_sk(sk)->user_frag;
5229
5230        if (put_user(len, optlen))
5231                return -EFAULT;
5232        if (len == sizeof(int)) {
5233                if (copy_to_user(optval, &params.assoc_value, len))
5234                        return -EFAULT;
5235        } else {
5236                if (copy_to_user(optval, &params, len))
5237                        return -EFAULT;
5238        }
5239
5240        return 0;
5241}
5242
5243/*
5244 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
5245 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
5246 */
5247static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
5248                                               char __user *optval, int __user *optlen)
5249{
5250        int val;
5251
5252        if (len < sizeof(int))
5253                return -EINVAL;
5254
5255        len = sizeof(int);
5256
5257        val = sctp_sk(sk)->frag_interleave;
5258        if (put_user(len, optlen))
5259                return -EFAULT;
5260        if (copy_to_user(optval, &val, len))
5261                return -EFAULT;
5262
5263        return 0;
5264}
5265
5266/*
5267 * 7.1.25.  Set or Get the sctp partial delivery point
5268 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
5269 */
5270static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
5271                                                  char __user *optval,
5272                                                  int __user *optlen)
5273{
5274        u32 val;
5275
5276        if (len < sizeof(u32))
5277                return -EINVAL;
5278
5279        len = sizeof(u32);
5280
5281        val = sctp_sk(sk)->pd_point;
5282        if (put_user(len, optlen))
5283                return -EFAULT;
5284        if (copy_to_user(optval, &val, len))
5285                return -EFAULT;
5286
5287        return 0;
5288}
5289
5290/*
5291 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
5292 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
5293 */
5294static int sctp_getsockopt_maxburst(struct sock *sk, int len,
5295                                    char __user *optval,
5296                                    int __user *optlen)
5297{
5298        struct sctp_assoc_value params;
5299        struct sctp_sock *sp;
5300        struct sctp_association *asoc;
5301
5302        if (len == sizeof(int)) {
5303                pr_warn("Use of int in max_burst socket option deprecated\n");
5304                pr_warn("Use struct sctp_assoc_value instead\n");
5305                params.assoc_id = 0;
5306        } else if (len >= sizeof(struct sctp_assoc_value)) {
5307                len = sizeof(struct sctp_assoc_value);
5308                if (copy_from_user(&params, optval, len))
5309                        return -EFAULT;
5310        } else
5311                return -EINVAL;
5312
5313        sp = sctp_sk(sk);
5314
5315        if (params.assoc_id != 0) {
5316                asoc = sctp_id2assoc(sk, params.assoc_id);
5317                if (!asoc)
5318                        return -EINVAL;
5319                params.assoc_value = asoc->max_burst;
5320        } else
5321                params.assoc_value = sp->max_burst;
5322
5323        if (len == sizeof(int)) {
5324                if (copy_to_user(optval, &params.assoc_value, len))
5325                        return -EFAULT;
5326        } else {
5327                if (copy_to_user(optval, &params, len))
5328                        return -EFAULT;
5329        }
5330
5331        return 0;
5332
5333}
5334
5335static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
5336                                    char __user *optval, int __user *optlen)
5337{
5338        struct net *net = sock_net(sk);
5339        struct sctp_hmacalgo  __user *p = (void __user *)optval;
5340        struct sctp_hmac_algo_param *hmacs;
5341        __u16 data_len = 0;
5342        u32 num_idents;
5343
5344        if (!net->sctp.auth_enable)
5345                return -EACCES;
5346
5347        hmacs = sctp_sk(sk)->ep->auth_hmacs_list;
5348        data_len = ntohs(hmacs->param_hdr.length) - sizeof(sctp_paramhdr_t);
5349
5350        if (len < sizeof(struct sctp_hmacalgo) + data_len)
5351                return -EINVAL;
5352
5353        len = sizeof(struct sctp_hmacalgo) + data_len;
5354        num_idents = data_len / sizeof(u16);
5355
5356        if (put_user(len, optlen))
5357                return -EFAULT;
5358        if (put_user(num_idents, &p->shmac_num_idents))
5359                return -EFAULT;
5360        if (copy_to_user(p->shmac_idents, hmacs->hmac_ids, data_len))
5361                return -EFAULT;
5362        return 0;
5363}
5364
5365static int sctp_getsockopt_active_key(struct sock *sk, int len,
5366                                    char __user *optval, int __user *optlen)
5367{
5368        struct net *net = sock_net(sk);
5369        struct sctp_authkeyid val;
5370        struct sctp_association *asoc;
5371
5372        if (!net->sctp.auth_enable)
5373                return -EACCES;
5374
5375        if (len < sizeof(struct sctp_authkeyid))
5376                return -EINVAL;
5377        if (copy_from_user(&val, optval, sizeof(struct sctp_authkeyid)))
5378                return -EFAULT;
5379
5380        asoc = sctp_id2assoc(sk, val.scact_assoc_id);
5381        if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
5382                return -EINVAL;
5383
5384        if (asoc)
5385                val.scact_keynumber = asoc->active_key_id;
5386        else
5387                val.scact_keynumber = sctp_sk(sk)->ep->active_key_id;
5388
5389        len = sizeof(struct sctp_authkeyid);
5390        if (put_user(len, optlen))
5391                return -EFAULT;
5392        if (copy_to_user(optval, &val, len))
5393                return -EFAULT;
5394
5395        return 0;
5396}
5397
5398static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
5399                                    char __user *optval, int __user *optlen)
5400{
5401        struct net *net = sock_net(sk);
5402        struct sctp_authchunks __user *p = (void __user *)optval;
5403        struct sctp_authchunks val;
5404        struct sctp_association *asoc;
5405        struct sctp_chunks_param *ch;
5406        u32    num_chunks = 0;
5407        char __user *to;
5408
5409        if (!net->sctp.auth_enable)
5410                return -EACCES;
5411
5412        if (len < sizeof(struct sctp_authchunks))
5413                return -EINVAL;
5414
5415        if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5416                return -EFAULT;
5417
5418        to = p->gauth_chunks;
5419        asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5420        if (!asoc)
5421                return -EINVAL;
5422
5423        ch = asoc->peer.peer_chunks;
5424        if (!ch)
5425                goto num;
5426
5427        /* See if the user provided enough room for all the data */
5428        num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5429        if (len < num_chunks)
5430                return -EINVAL;
5431
5432        if (copy_to_user(to, ch->chunks, num_chunks))
5433                return -EFAULT;
5434num:
5435        len = sizeof(struct sctp_authchunks) + num_chunks;
5436        if (put_user(len, optlen)) return -EFAULT;
5437        if (put_user(num_chunks, &p->gauth_number_of_chunks))
5438                return -EFAULT;
5439        return 0;
5440}
5441
5442static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
5443                                    char __user *optval, int __user *optlen)
5444{
5445        struct net *net = sock_net(sk);
5446        struct sctp_authchunks __user *p = (void __user *)optval;
5447        struct sctp_authchunks val;
5448        struct sctp_association *asoc;
5449        struct sctp_chunks_param *ch;
5450        u32    num_chunks = 0;
5451        char __user *to;
5452
5453        if (!net->sctp.auth_enable)
5454                return -EACCES;
5455
5456        if (len < sizeof(struct sctp_authchunks))
5457                return -EINVAL;
5458
5459        if (copy_from_user(&val, optval, sizeof(struct sctp_authchunks)))
5460                return -EFAULT;
5461
5462        to = p->gauth_chunks;
5463        asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
5464        if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
5465                return -EINVAL;
5466
5467        if (asoc)
5468                ch = (struct sctp_chunks_param*)asoc->c.auth_chunks;
5469        else
5470                ch = sctp_sk(sk)->ep->auth_chunk_list;
5471
5472        if (!ch)
5473                goto num;
5474
5475        num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t);
5476        if (len < sizeof(struct sctp_authchunks) + num_chunks)
5477                return -EINVAL;
5478
5479        if (copy_to_user(to, ch->chunks, num_chunks))
5480                return -EFAULT;
5481num:
5482        len = sizeof(struct sctp_authchunks) + num_chunks;
5483        if (put_user(len, optlen))
5484                return -EFAULT;
5485        if (put_user(num_chunks, &p->gauth_number_of_chunks))
5486                return -EFAULT;
5487
5488        return 0;
5489}
5490
5491/*
5492 * 8.2.5.  Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
5493 * This option gets the current number of associations that are attached
5494 * to a one-to-many style socket.  The option value is an uint32_t.
5495 */
5496static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
5497                                    char __user *optval, int __user *optlen)
5498{
5499        struct sctp_sock *sp = sctp_sk(sk);
5500        struct sctp_association *asoc;
5501        u32 val = 0;
5502
5503        if (sctp_style(sk, TCP))
5504                return -EOPNOTSUPP;
5505
5506        if (len < sizeof(u32))
5507                return -EINVAL;
5508
5509        len = sizeof(u32);
5510
5511        list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5512                val++;
5513        }
5514
5515        if (put_user(len, optlen))
5516                return -EFAULT;
5517        if (copy_to_user(optval, &val, len))
5518                return -EFAULT;
5519
5520        return 0;
5521}
5522
5523/*
5524 * 8.1.23 SCTP_AUTO_ASCONF
5525 * See the corresponding setsockopt entry as description
5526 */
5527static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
5528                                   char __user *optval, int __user *optlen)
5529{
5530        int val = 0;
5531
5532        if (len < sizeof(int))
5533                return -EINVAL;
5534
5535        len = sizeof(int);
5536        if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
5537                val = 1;
5538        if (put_user(len, optlen))
5539                return -EFAULT;
5540        if (copy_to_user(optval, &val, len))
5541                return -EFAULT;
5542        return 0;
5543}
5544
5545/*
5546 * 8.2.6. Get the Current Identifiers of Associations
5547 *        (SCTP_GET_ASSOC_ID_LIST)
5548 *
5549 * This option gets the current list of SCTP association identifiers of
5550 * the SCTP associations handled by a one-to-many style socket.
5551 */
5552static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
5553                                    char __user *optval, int __user *optlen)
5554{
5555        struct sctp_sock *sp = sctp_sk(sk);
5556        struct sctp_association *asoc;
5557        struct sctp_assoc_ids *ids;
5558        u32 num = 0;
5559
5560        if (sctp_style(sk, TCP))
5561                return -EOPNOTSUPP;
5562
5563        if (len < sizeof(struct sctp_assoc_ids))
5564                return -EINVAL;
5565
5566        list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5567                num++;
5568        }
5569
5570        if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
5571                return -EINVAL;
5572
5573        len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
5574
5575        ids = kmalloc(len, GFP_KERNEL);
5576        if (unlikely(!ids))
5577                return -ENOMEM;
5578
5579        ids->gaids_number_of_ids = num;
5580        num = 0;
5581        list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
5582                ids->gaids_assoc_id[num++] = asoc->assoc_id;
5583        }
5584
5585        if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
5586                kfree(ids);
5587                return -EFAULT;
5588        }
5589
5590        kfree(ids);
5591        return 0;
5592}
5593
5594/*
5595 * SCTP_PEER_ADDR_THLDS
5596 *
5597 * This option allows us to fetch the partially failed threshold for one or all
5598 * transports in an association.  See Section 6.1 of:
5599 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
5600 */
5601static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
5602                                            char __user *optval,