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