linux/net/sctp/socket.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* SCTP kernel implementation
   3 * (C) Copyright IBM Corp. 2001, 2004
   4 * Copyright (c) 1999-2000 Cisco, Inc.
   5 * Copyright (c) 1999-2001 Motorola, Inc.
   6 * Copyright (c) 2001-2003 Intel Corp.
   7 * Copyright (c) 2001-2002 Nokia, Inc.
   8 * Copyright (c) 2001 La Monte H.P. Yarroll
   9 *
  10 * This file is part of the SCTP kernel implementation
  11 *
  12 * These functions interface with the sockets layer to implement the
  13 * SCTP Extensions for the Sockets API.
  14 *
  15 * Note that the descriptions from the specification are USER level
  16 * functions--this file is the functions which populate the struct proto
  17 * for SCTP which is the BOTTOM of the sockets interface.
  18 *
  19 * Please send any bug reports or fixes you make to the
  20 * email address(es):
  21 *    lksctp developers <linux-sctp@vger.kernel.org>
  22 *
  23 * Written or modified by:
  24 *    La Monte H.P. Yarroll <piggy@acm.org>
  25 *    Narasimha Budihal     <narsi@refcode.org>
  26 *    Karl Knutson          <karl@athena.chicago.il.us>
  27 *    Jon Grimm             <jgrimm@us.ibm.com>
  28 *    Xingang Guo           <xingang.guo@intel.com>
  29 *    Daisy Chang           <daisyc@us.ibm.com>
  30 *    Sridhar Samudrala     <samudrala@us.ibm.com>
  31 *    Inaky Perez-Gonzalez  <inaky.gonzalez@intel.com>
  32 *    Ardelle Fan           <ardelle.fan@intel.com>
  33 *    Ryan Layer            <rmlayer@us.ibm.com>
  34 *    Anup Pemmaiah         <pemmaiah@cc.usu.edu>
  35 *    Kevin Gao             <kevin.gao@intel.com>
  36 */
  37
  38#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  39
  40#include <crypto/hash.h>
  41#include <linux/types.h>
  42#include <linux/kernel.h>
  43#include <linux/wait.h>
  44#include <linux/time.h>
  45#include <linux/sched/signal.h>
  46#include <linux/ip.h>
  47#include <linux/capability.h>
  48#include <linux/fcntl.h>
  49#include <linux/poll.h>
  50#include <linux/init.h>
  51#include <linux/slab.h>
  52#include <linux/file.h>
  53#include <linux/compat.h>
  54#include <linux/rhashtable.h>
  55
  56#include <net/ip.h>
  57#include <net/icmp.h>
  58#include <net/route.h>
  59#include <net/ipv6.h>
  60#include <net/inet_common.h>
  61#include <net/busy_poll.h>
  62
  63#include <linux/socket.h> /* for sa_family_t */
  64#include <linux/export.h>
  65#include <net/sock.h>
  66#include <net/sctp/sctp.h>
  67#include <net/sctp/sm.h>
  68#include <net/sctp/stream_sched.h>
  69
  70/* Forward declarations for internal helper functions. */
  71static bool sctp_writeable(struct sock *sk);
  72static void sctp_wfree(struct sk_buff *skb);
  73static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
  74                                size_t msg_len);
  75static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
  76static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
  77static int sctp_wait_for_accept(struct sock *sk, long timeo);
  78static void sctp_wait_for_close(struct sock *sk, long timeo);
  79static void sctp_destruct_sock(struct sock *sk);
  80static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
  81                                        union sctp_addr *addr, int len);
  82static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
  83static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
  84static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
  85static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
  86static int sctp_send_asconf(struct sctp_association *asoc,
  87                            struct sctp_chunk *chunk);
  88static int sctp_do_bind(struct sock *, union sctp_addr *, int);
  89static int sctp_autobind(struct sock *sk);
  90static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
  91                             struct sctp_association *assoc,
  92                             enum sctp_socket_type type);
  93
  94static unsigned long sctp_memory_pressure;
  95static atomic_long_t sctp_memory_allocated;
  96struct percpu_counter sctp_sockets_allocated;
  97
  98static void sctp_enter_memory_pressure(struct sock *sk)
  99{
 100        sctp_memory_pressure = 1;
 101}
 102
 103
 104/* Get the sndbuf space available at the time on the association.  */
 105static inline int sctp_wspace(struct sctp_association *asoc)
 106{
 107        struct sock *sk = asoc->base.sk;
 108
 109        return asoc->ep->sndbuf_policy ? sk->sk_sndbuf - asoc->sndbuf_used
 110                                       : sk_stream_wspace(sk);
 111}
 112
 113/* Increment the used sndbuf space count of the corresponding association by
 114 * the size of the outgoing data chunk.
 115 * Also, set the skb destructor for sndbuf accounting later.
 116 *
 117 * Since it is always 1-1 between chunk and skb, and also a new skb is always
 118 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
 119 * destructor in the data chunk skb for the purpose of the sndbuf space
 120 * tracking.
 121 */
 122static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
 123{
 124        struct sctp_association *asoc = chunk->asoc;
 125        struct sock *sk = asoc->base.sk;
 126
 127        /* The sndbuf space is tracked per association.  */
 128        sctp_association_hold(asoc);
 129
 130        if (chunk->shkey)
 131                sctp_auth_shkey_hold(chunk->shkey);
 132
 133        skb_set_owner_w(chunk->skb, sk);
 134
 135        chunk->skb->destructor = sctp_wfree;
 136        /* Save the chunk pointer in skb for sctp_wfree to use later.  */
 137        skb_shinfo(chunk->skb)->destructor_arg = chunk;
 138
 139        refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
 140        asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk);
 141        sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk);
 142        sk_mem_charge(sk, chunk->skb->truesize);
 143}
 144
 145static void sctp_clear_owner_w(struct sctp_chunk *chunk)
 146{
 147        skb_orphan(chunk->skb);
 148}
 149
 150#define traverse_and_process()  \
 151do {                            \
 152        msg = chunk->msg;       \
 153        if (msg == prev_msg)    \
 154                continue;       \
 155        list_for_each_entry(c, &msg->chunks, frag_list) {       \
 156                if ((clear && asoc->base.sk == c->skb->sk) ||   \
 157                    (!clear && asoc->base.sk != c->skb->sk))    \
 158                        cb(c);  \
 159        }                       \
 160        prev_msg = msg;         \
 161} while (0)
 162
 163static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
 164                                       bool clear,
 165                                       void (*cb)(struct sctp_chunk *))
 166
 167{
 168        struct sctp_datamsg *msg, *prev_msg = NULL;
 169        struct sctp_outq *q = &asoc->outqueue;
 170        struct sctp_chunk *chunk, *c;
 171        struct sctp_transport *t;
 172
 173        list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
 174                list_for_each_entry(chunk, &t->transmitted, transmitted_list)
 175                        traverse_and_process();
 176
 177        list_for_each_entry(chunk, &q->retransmit, transmitted_list)
 178                traverse_and_process();
 179
 180        list_for_each_entry(chunk, &q->sacked, transmitted_list)
 181                traverse_and_process();
 182
 183        list_for_each_entry(chunk, &q->abandoned, transmitted_list)
 184                traverse_and_process();
 185
 186        list_for_each_entry(chunk, &q->out_chunk_list, list)
 187                traverse_and_process();
 188}
 189
 190static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
 191                                 void (*cb)(struct sk_buff *, struct sock *))
 192
 193{
 194        struct sk_buff *skb, *tmp;
 195
 196        sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
 197                cb(skb, sk);
 198
 199        sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
 200                cb(skb, sk);
 201
 202        sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
 203                cb(skb, sk);
 204}
 205
 206/* Verify that this is a valid address. */
 207static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
 208                                   int len)
 209{
 210        struct sctp_af *af;
 211
 212        /* Verify basic sockaddr. */
 213        af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
 214        if (!af)
 215                return -EINVAL;
 216
 217        /* Is this a valid SCTP address?  */
 218        if (!af->addr_valid(addr, sctp_sk(sk), NULL))
 219                return -EINVAL;
 220
 221        if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
 222                return -EINVAL;
 223
 224        return 0;
 225}
 226
 227/* Look up the association by its id.  If this is not a UDP-style
 228 * socket, the ID field is always ignored.
 229 */
 230struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
 231{
 232        struct sctp_association *asoc = NULL;
 233
 234        /* If this is not a UDP-style socket, assoc id should be ignored. */
 235        if (!sctp_style(sk, UDP)) {
 236                /* Return NULL if the socket state is not ESTABLISHED. It
 237                 * could be a TCP-style listening socket or a socket which
 238                 * hasn't yet called connect() to establish an association.
 239                 */
 240                if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
 241                        return NULL;
 242
 243                /* Get the first and the only association from the list. */
 244                if (!list_empty(&sctp_sk(sk)->ep->asocs))
 245                        asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
 246                                          struct sctp_association, asocs);
 247                return asoc;
 248        }
 249
 250        /* Otherwise this is a UDP-style socket. */
 251        if (id <= SCTP_ALL_ASSOC)
 252                return NULL;
 253
 254        spin_lock_bh(&sctp_assocs_id_lock);
 255        asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
 256        if (asoc && (asoc->base.sk != sk || asoc->base.dead))
 257                asoc = NULL;
 258        spin_unlock_bh(&sctp_assocs_id_lock);
 259
 260        return asoc;
 261}
 262
 263/* Look up the transport from an address and an assoc id. If both address and
 264 * id are specified, the associations matching the address and the id should be
 265 * the same.
 266 */
 267static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
 268                                              struct sockaddr_storage *addr,
 269                                              sctp_assoc_t id)
 270{
 271        struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
 272        struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
 273        union sctp_addr *laddr = (union sctp_addr *)addr;
 274        struct sctp_transport *transport;
 275
 276        if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
 277                return NULL;
 278
 279        addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
 280                                               laddr,
 281                                               &transport);
 282
 283        if (!addr_asoc)
 284                return NULL;
 285
 286        id_asoc = sctp_id2assoc(sk, id);
 287        if (id_asoc && (id_asoc != addr_asoc))
 288                return NULL;
 289
 290        sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
 291                                                (union sctp_addr *)addr);
 292
 293        return transport;
 294}
 295
 296/* API 3.1.2 bind() - UDP Style Syntax
 297 * The syntax of bind() is,
 298 *
 299 *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
 300 *
 301 *   sd      - the socket descriptor returned by socket().
 302 *   addr    - the address structure (struct sockaddr_in or struct
 303 *             sockaddr_in6 [RFC 2553]),
 304 *   addr_len - the size of the address structure.
 305 */
 306static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
 307{
 308        int retval = 0;
 309
 310        lock_sock(sk);
 311
 312        pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
 313                 addr, addr_len);
 314
 315        /* Disallow binding twice. */
 316        if (!sctp_sk(sk)->ep->base.bind_addr.port)
 317                retval = sctp_do_bind(sk, (union sctp_addr *)addr,
 318                                      addr_len);
 319        else
 320                retval = -EINVAL;
 321
 322        release_sock(sk);
 323
 324        return retval;
 325}
 326
 327static int sctp_get_port_local(struct sock *, union sctp_addr *);
 328
 329/* Verify this is a valid sockaddr. */
 330static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
 331                                        union sctp_addr *addr, int len)
 332{
 333        struct sctp_af *af;
 334
 335        /* Check minimum size.  */
 336        if (len < sizeof (struct sockaddr))
 337                return NULL;
 338
 339        if (!opt->pf->af_supported(addr->sa.sa_family, opt))
 340                return NULL;
 341
 342        if (addr->sa.sa_family == AF_INET6) {
 343                if (len < SIN6_LEN_RFC2133)
 344                        return NULL;
 345                /* V4 mapped address are really of AF_INET family */
 346                if (ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
 347                    !opt->pf->af_supported(AF_INET, opt))
 348                        return NULL;
 349        }
 350
 351        /* If we get this far, af is valid. */
 352        af = sctp_get_af_specific(addr->sa.sa_family);
 353
 354        if (len < af->sockaddr_len)
 355                return NULL;
 356
 357        return af;
 358}
 359
 360static void sctp_auto_asconf_init(struct sctp_sock *sp)
 361{
 362        struct net *net = sock_net(&sp->inet.sk);
 363
 364        if (net->sctp.default_auto_asconf) {
 365                spin_lock(&net->sctp.addr_wq_lock);
 366                list_add_tail(&sp->auto_asconf_list, &net->sctp.auto_asconf_splist);
 367                spin_unlock(&net->sctp.addr_wq_lock);
 368                sp->do_auto_asconf = 1;
 369        }
 370}
 371
 372/* Bind a local address either to an endpoint or to an association.  */
 373static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
 374{
 375        struct net *net = sock_net(sk);
 376        struct sctp_sock *sp = sctp_sk(sk);
 377        struct sctp_endpoint *ep = sp->ep;
 378        struct sctp_bind_addr *bp = &ep->base.bind_addr;
 379        struct sctp_af *af;
 380        unsigned short snum;
 381        int ret = 0;
 382
 383        /* Common sockaddr verification. */
 384        af = sctp_sockaddr_af(sp, addr, len);
 385        if (!af) {
 386                pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
 387                         __func__, sk, addr, len);
 388                return -EINVAL;
 389        }
 390
 391        snum = ntohs(addr->v4.sin_port);
 392
 393        pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
 394                 __func__, sk, &addr->sa, bp->port, snum, len);
 395
 396        /* PF specific bind() address verification. */
 397        if (!sp->pf->bind_verify(sp, addr))
 398                return -EADDRNOTAVAIL;
 399
 400        /* We must either be unbound, or bind to the same port.
 401         * It's OK to allow 0 ports if we are already bound.
 402         * We'll just inhert an already bound port in this case
 403         */
 404        if (bp->port) {
 405                if (!snum)
 406                        snum = bp->port;
 407                else if (snum != bp->port) {
 408                        pr_debug("%s: new port %d doesn't match existing port "
 409                                 "%d\n", __func__, snum, bp->port);
 410                        return -EINVAL;
 411                }
 412        }
 413
 414        if (snum && inet_port_requires_bind_service(net, snum) &&
 415            !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 416                return -EACCES;
 417
 418        /* See if the address matches any of the addresses we may have
 419         * already bound before checking against other endpoints.
 420         */
 421        if (sctp_bind_addr_match(bp, addr, sp))
 422                return -EINVAL;
 423
 424        /* Make sure we are allowed to bind here.
 425         * The function sctp_get_port_local() does duplicate address
 426         * detection.
 427         */
 428        addr->v4.sin_port = htons(snum);
 429        if (sctp_get_port_local(sk, addr))
 430                return -EADDRINUSE;
 431
 432        /* Refresh ephemeral port.  */
 433        if (!bp->port) {
 434                bp->port = inet_sk(sk)->inet_num;
 435                sctp_auto_asconf_init(sp);
 436        }
 437
 438        /* Add the address to the bind address list.
 439         * Use GFP_ATOMIC since BHs will be disabled.
 440         */
 441        ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
 442                                 SCTP_ADDR_SRC, GFP_ATOMIC);
 443
 444        if (ret) {
 445                sctp_put_port(sk);
 446                return ret;
 447        }
 448        /* Copy back into socket for getsockname() use. */
 449        inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
 450        sp->pf->to_sk_saddr(addr, sk);
 451
 452        return ret;
 453}
 454
 455 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
 456 *
 457 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
 458 * at any one time.  If a sender, after sending an ASCONF chunk, decides
 459 * it needs to transfer another ASCONF Chunk, it MUST wait until the
 460 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
 461 * subsequent ASCONF. Note this restriction binds each side, so at any
 462 * time two ASCONF may be in-transit on any given association (one sent
 463 * from each endpoint).
 464 */
 465static int sctp_send_asconf(struct sctp_association *asoc,
 466                            struct sctp_chunk *chunk)
 467{
 468        int retval = 0;
 469
 470        /* If there is an outstanding ASCONF chunk, queue it for later
 471         * transmission.
 472         */
 473        if (asoc->addip_last_asconf) {
 474                list_add_tail(&chunk->list, &asoc->addip_chunk_list);
 475                goto out;
 476        }
 477
 478        /* Hold the chunk until an ASCONF_ACK is received. */
 479        sctp_chunk_hold(chunk);
 480        retval = sctp_primitive_ASCONF(asoc->base.net, asoc, chunk);
 481        if (retval)
 482                sctp_chunk_free(chunk);
 483        else
 484                asoc->addip_last_asconf = chunk;
 485
 486out:
 487        return retval;
 488}
 489
 490/* Add a list of addresses as bind addresses to local endpoint or
 491 * association.
 492 *
 493 * Basically run through each address specified in the addrs/addrcnt
 494 * array/length pair, determine if it is IPv6 or IPv4 and call
 495 * sctp_do_bind() on it.
 496 *
 497 * If any of them fails, then the operation will be reversed and the
 498 * ones that were added will be removed.
 499 *
 500 * Only sctp_setsockopt_bindx() is supposed to call this function.
 501 */
 502static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
 503{
 504        int cnt;
 505        int retval = 0;
 506        void *addr_buf;
 507        struct sockaddr *sa_addr;
 508        struct sctp_af *af;
 509
 510        pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
 511                 addrs, addrcnt);
 512
 513        addr_buf = addrs;
 514        for (cnt = 0; cnt < addrcnt; cnt++) {
 515                /* The list may contain either IPv4 or IPv6 address;
 516                 * determine the address length for walking thru the list.
 517                 */
 518                sa_addr = addr_buf;
 519                af = sctp_get_af_specific(sa_addr->sa_family);
 520                if (!af) {
 521                        retval = -EINVAL;
 522                        goto err_bindx_add;
 523                }
 524
 525                retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
 526                                      af->sockaddr_len);
 527
 528                addr_buf += af->sockaddr_len;
 529
 530err_bindx_add:
 531                if (retval < 0) {
 532                        /* Failed. Cleanup the ones that have been added */
 533                        if (cnt > 0)
 534                                sctp_bindx_rem(sk, addrs, cnt);
 535                        return retval;
 536                }
 537        }
 538
 539        return retval;
 540}
 541
 542/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
 543 * associations that are part of the endpoint indicating that a list of local
 544 * addresses are added to the endpoint.
 545 *
 546 * If any of the addresses is already in the bind address list of the
 547 * association, we do not send the chunk for that association.  But it will not
 548 * affect other associations.
 549 *
 550 * Only sctp_setsockopt_bindx() is supposed to call this function.
 551 */
 552static int sctp_send_asconf_add_ip(struct sock          *sk,
 553                                   struct sockaddr      *addrs,
 554                                   int                  addrcnt)
 555{
 556        struct sctp_sock                *sp;
 557        struct sctp_endpoint            *ep;
 558        struct sctp_association         *asoc;
 559        struct sctp_bind_addr           *bp;
 560        struct sctp_chunk               *chunk;
 561        struct sctp_sockaddr_entry      *laddr;
 562        union sctp_addr                 *addr;
 563        union sctp_addr                 saveaddr;
 564        void                            *addr_buf;
 565        struct sctp_af                  *af;
 566        struct list_head                *p;
 567        int                             i;
 568        int                             retval = 0;
 569
 570        sp = sctp_sk(sk);
 571        ep = sp->ep;
 572
 573        if (!ep->asconf_enable)
 574                return retval;
 575
 576        pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
 577                 __func__, sk, addrs, addrcnt);
 578
 579        list_for_each_entry(asoc, &ep->asocs, asocs) {
 580                if (!asoc->peer.asconf_capable)
 581                        continue;
 582
 583                if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
 584                        continue;
 585
 586                if (!sctp_state(asoc, ESTABLISHED))
 587                        continue;
 588
 589                /* Check if any address in the packed array of addresses is
 590                 * in the bind address list of the association. If so,
 591                 * do not send the asconf chunk to its peer, but continue with
 592                 * other associations.
 593                 */
 594                addr_buf = addrs;
 595                for (i = 0; i < addrcnt; i++) {
 596                        addr = addr_buf;
 597                        af = sctp_get_af_specific(addr->v4.sin_family);
 598                        if (!af) {
 599                                retval = -EINVAL;
 600                                goto out;
 601                        }
 602
 603                        if (sctp_assoc_lookup_laddr(asoc, addr))
 604                                break;
 605
 606                        addr_buf += af->sockaddr_len;
 607                }
 608                if (i < addrcnt)
 609                        continue;
 610
 611                /* Use the first valid address in bind addr list of
 612                 * association as Address Parameter of ASCONF CHUNK.
 613                 */
 614                bp = &asoc->base.bind_addr;
 615                p = bp->address_list.next;
 616                laddr = list_entry(p, struct sctp_sockaddr_entry, list);
 617                chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
 618                                                   addrcnt, SCTP_PARAM_ADD_IP);
 619                if (!chunk) {
 620                        retval = -ENOMEM;
 621                        goto out;
 622                }
 623
 624                /* Add the new addresses to the bind address list with
 625                 * use_as_src set to 0.
 626                 */
 627                addr_buf = addrs;
 628                for (i = 0; i < addrcnt; i++) {
 629                        addr = addr_buf;
 630                        af = sctp_get_af_specific(addr->v4.sin_family);
 631                        memcpy(&saveaddr, addr, af->sockaddr_len);
 632                        retval = sctp_add_bind_addr(bp, &saveaddr,
 633                                                    sizeof(saveaddr),
 634                                                    SCTP_ADDR_NEW, GFP_ATOMIC);
 635                        addr_buf += af->sockaddr_len;
 636                }
 637                if (asoc->src_out_of_asoc_ok) {
 638                        struct sctp_transport *trans;
 639
 640                        list_for_each_entry(trans,
 641                            &asoc->peer.transport_addr_list, transports) {
 642                                trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
 643                                    2*asoc->pathmtu, 4380));
 644                                trans->ssthresh = asoc->peer.i.a_rwnd;
 645                                trans->rto = asoc->rto_initial;
 646                                sctp_max_rto(asoc, trans);
 647                                trans->rtt = trans->srtt = trans->rttvar = 0;
 648                                /* Clear the source and route cache */
 649                                sctp_transport_route(trans, NULL,
 650                                                     sctp_sk(asoc->base.sk));
 651                        }
 652                }
 653                retval = sctp_send_asconf(asoc, chunk);
 654        }
 655
 656out:
 657        return retval;
 658}
 659
 660/* Remove a list of addresses from bind addresses list.  Do not remove the
 661 * last address.
 662 *
 663 * Basically run through each address specified in the addrs/addrcnt
 664 * array/length pair, determine if it is IPv6 or IPv4 and call
 665 * sctp_del_bind() on it.
 666 *
 667 * If any of them fails, then the operation will be reversed and the
 668 * ones that were removed will be added back.
 669 *
 670 * At least one address has to be left; if only one address is
 671 * available, the operation will return -EBUSY.
 672 *
 673 * Only sctp_setsockopt_bindx() is supposed to call this function.
 674 */
 675static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
 676{
 677        struct sctp_sock *sp = sctp_sk(sk);
 678        struct sctp_endpoint *ep = sp->ep;
 679        int cnt;
 680        struct sctp_bind_addr *bp = &ep->base.bind_addr;
 681        int retval = 0;
 682        void *addr_buf;
 683        union sctp_addr *sa_addr;
 684        struct sctp_af *af;
 685
 686        pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
 687                 __func__, sk, addrs, addrcnt);
 688
 689        addr_buf = addrs;
 690        for (cnt = 0; cnt < addrcnt; cnt++) {
 691                /* If the bind address list is empty or if there is only one
 692                 * bind address, there is nothing more to be removed (we need
 693                 * at least one address here).
 694                 */
 695                if (list_empty(&bp->address_list) ||
 696                    (sctp_list_single_entry(&bp->address_list))) {
 697                        retval = -EBUSY;
 698                        goto err_bindx_rem;
 699                }
 700
 701                sa_addr = addr_buf;
 702                af = sctp_get_af_specific(sa_addr->sa.sa_family);
 703                if (!af) {
 704                        retval = -EINVAL;
 705                        goto err_bindx_rem;
 706                }
 707
 708                if (!af->addr_valid(sa_addr, sp, NULL)) {
 709                        retval = -EADDRNOTAVAIL;
 710                        goto err_bindx_rem;
 711                }
 712
 713                if (sa_addr->v4.sin_port &&
 714                    sa_addr->v4.sin_port != htons(bp->port)) {
 715                        retval = -EINVAL;
 716                        goto err_bindx_rem;
 717                }
 718
 719                if (!sa_addr->v4.sin_port)
 720                        sa_addr->v4.sin_port = htons(bp->port);
 721
 722                /* FIXME - There is probably a need to check if sk->sk_saddr and
 723                 * sk->sk_rcv_addr are currently set to one of the addresses to
 724                 * be removed. This is something which needs to be looked into
 725                 * when we are fixing the outstanding issues with multi-homing
 726                 * socket routing and failover schemes. Refer to comments in
 727                 * sctp_do_bind(). -daisy
 728                 */
 729                retval = sctp_del_bind_addr(bp, sa_addr);
 730
 731                addr_buf += af->sockaddr_len;
 732err_bindx_rem:
 733                if (retval < 0) {
 734                        /* Failed. Add the ones that has been removed back */
 735                        if (cnt > 0)
 736                                sctp_bindx_add(sk, addrs, cnt);
 737                        return retval;
 738                }
 739        }
 740
 741        return retval;
 742}
 743
 744/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
 745 * the associations that are part of the endpoint indicating that a list of
 746 * local addresses are removed from the endpoint.
 747 *
 748 * If any of the addresses is already in the bind address list of the
 749 * association, we do not send the chunk for that association.  But it will not
 750 * affect other associations.
 751 *
 752 * Only sctp_setsockopt_bindx() is supposed to call this function.
 753 */
 754static int sctp_send_asconf_del_ip(struct sock          *sk,
 755                                   struct sockaddr      *addrs,
 756                                   int                  addrcnt)
 757{
 758        struct sctp_sock        *sp;
 759        struct sctp_endpoint    *ep;
 760        struct sctp_association *asoc;
 761        struct sctp_transport   *transport;
 762        struct sctp_bind_addr   *bp;
 763        struct sctp_chunk       *chunk;
 764        union sctp_addr         *laddr;
 765        void                    *addr_buf;
 766        struct sctp_af          *af;
 767        struct sctp_sockaddr_entry *saddr;
 768        int                     i;
 769        int                     retval = 0;
 770        int                     stored = 0;
 771
 772        chunk = NULL;
 773        sp = sctp_sk(sk);
 774        ep = sp->ep;
 775
 776        if (!ep->asconf_enable)
 777                return retval;
 778
 779        pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
 780                 __func__, sk, addrs, addrcnt);
 781
 782        list_for_each_entry(asoc, &ep->asocs, asocs) {
 783
 784                if (!asoc->peer.asconf_capable)
 785                        continue;
 786
 787                if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
 788                        continue;
 789
 790                if (!sctp_state(asoc, ESTABLISHED))
 791                        continue;
 792
 793                /* Check if any address in the packed array of addresses is
 794                 * not present in the bind address list of the association.
 795                 * If so, do not send the asconf chunk to its peer, but
 796                 * continue with other associations.
 797                 */
 798                addr_buf = addrs;
 799                for (i = 0; i < addrcnt; i++) {
 800                        laddr = addr_buf;
 801                        af = sctp_get_af_specific(laddr->v4.sin_family);
 802                        if (!af) {
 803                                retval = -EINVAL;
 804                                goto out;
 805                        }
 806
 807                        if (!sctp_assoc_lookup_laddr(asoc, laddr))
 808                                break;
 809
 810                        addr_buf += af->sockaddr_len;
 811                }
 812                if (i < addrcnt)
 813                        continue;
 814
 815                /* Find one address in the association's bind address list
 816                 * that is not in the packed array of addresses. This is to
 817                 * make sure that we do not delete all the addresses in the
 818                 * association.
 819                 */
 820                bp = &asoc->base.bind_addr;
 821                laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
 822                                               addrcnt, sp);
 823                if ((laddr == NULL) && (addrcnt == 1)) {
 824                        if (asoc->asconf_addr_del_pending)
 825                                continue;
 826                        asoc->asconf_addr_del_pending =
 827                            kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
 828                        if (asoc->asconf_addr_del_pending == NULL) {
 829                                retval = -ENOMEM;
 830                                goto out;
 831                        }
 832                        asoc->asconf_addr_del_pending->sa.sa_family =
 833                                    addrs->sa_family;
 834                        asoc->asconf_addr_del_pending->v4.sin_port =
 835                                    htons(bp->port);
 836                        if (addrs->sa_family == AF_INET) {
 837                                struct sockaddr_in *sin;
 838
 839                                sin = (struct sockaddr_in *)addrs;
 840                                asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
 841                        } else if (addrs->sa_family == AF_INET6) {
 842                                struct sockaddr_in6 *sin6;
 843
 844                                sin6 = (struct sockaddr_in6 *)addrs;
 845                                asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
 846                        }
 847
 848                        pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
 849                                 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
 850                                 asoc->asconf_addr_del_pending);
 851
 852                        asoc->src_out_of_asoc_ok = 1;
 853                        stored = 1;
 854                        goto skip_mkasconf;
 855                }
 856
 857                if (laddr == NULL)
 858                        return -EINVAL;
 859
 860                /* We do not need RCU protection throughout this loop
 861                 * because this is done under a socket lock from the
 862                 * setsockopt call.
 863                 */
 864                chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
 865                                                   SCTP_PARAM_DEL_IP);
 866                if (!chunk) {
 867                        retval = -ENOMEM;
 868                        goto out;
 869                }
 870
 871skip_mkasconf:
 872                /* Reset use_as_src flag for the addresses in the bind address
 873                 * list that are to be deleted.
 874                 */
 875                addr_buf = addrs;
 876                for (i = 0; i < addrcnt; i++) {
 877                        laddr = addr_buf;
 878                        af = sctp_get_af_specific(laddr->v4.sin_family);
 879                        list_for_each_entry(saddr, &bp->address_list, list) {
 880                                if (sctp_cmp_addr_exact(&saddr->a, laddr))
 881                                        saddr->state = SCTP_ADDR_DEL;
 882                        }
 883                        addr_buf += af->sockaddr_len;
 884                }
 885
 886                /* Update the route and saddr entries for all the transports
 887                 * as some of the addresses in the bind address list are
 888                 * about to be deleted and cannot be used as source addresses.
 889                 */
 890                list_for_each_entry(transport, &asoc->peer.transport_addr_list,
 891                                        transports) {
 892                        sctp_transport_route(transport, NULL,
 893                                             sctp_sk(asoc->base.sk));
 894                }
 895
 896                if (stored)
 897                        /* We don't need to transmit ASCONF */
 898                        continue;
 899                retval = sctp_send_asconf(asoc, chunk);
 900        }
 901out:
 902        return retval;
 903}
 904
 905/* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
 906int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
 907{
 908        struct sock *sk = sctp_opt2sk(sp);
 909        union sctp_addr *addr;
 910        struct sctp_af *af;
 911
 912        /* It is safe to write port space in caller. */
 913        addr = &addrw->a;
 914        addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
 915        af = sctp_get_af_specific(addr->sa.sa_family);
 916        if (!af)
 917                return -EINVAL;
 918        if (sctp_verify_addr(sk, addr, af->sockaddr_len))
 919                return -EINVAL;
 920
 921        if (addrw->state == SCTP_ADDR_NEW)
 922                return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
 923        else
 924                return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
 925}
 926
 927/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
 928 *
 929 * API 8.1
 930 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
 931 *                int flags);
 932 *
 933 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
 934 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
 935 * or IPv6 addresses.
 936 *
 937 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
 938 * Section 3.1.2 for this usage.
 939 *
 940 * addrs is a pointer to an array of one or more socket addresses. Each
 941 * address is contained in its appropriate structure (i.e. struct
 942 * sockaddr_in or struct sockaddr_in6) the family of the address type
 943 * must be used to distinguish the address length (note that this
 944 * representation is termed a "packed array" of addresses). The caller
 945 * specifies the number of addresses in the array with addrcnt.
 946 *
 947 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
 948 * -1, and sets errno to the appropriate error code.
 949 *
 950 * For SCTP, the port given in each socket address must be the same, or
 951 * sctp_bindx() will fail, setting errno to EINVAL.
 952 *
 953 * The flags parameter is formed from the bitwise OR of zero or more of
 954 * the following currently defined flags:
 955 *
 956 * SCTP_BINDX_ADD_ADDR
 957 *
 958 * SCTP_BINDX_REM_ADDR
 959 *
 960 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
 961 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
 962 * addresses from the association. The two flags are mutually exclusive;
 963 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
 964 * not remove all addresses from an association; sctp_bindx() will
 965 * reject such an attempt with EINVAL.
 966 *
 967 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
 968 * additional addresses with an endpoint after calling bind().  Or use
 969 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
 970 * socket is associated with so that no new association accepted will be
 971 * associated with those addresses. If the endpoint supports dynamic
 972 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
 973 * endpoint to send the appropriate message to the peer to change the
 974 * peers address lists.
 975 *
 976 * Adding and removing addresses from a connected association is
 977 * optional functionality. Implementations that do not support this
 978 * functionality should return EOPNOTSUPP.
 979 *
 980 * Basically do nothing but copying the addresses from user to kernel
 981 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
 982 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
 983 * from userspace.
 984 *
 985 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 986 * it.
 987 *
 988 * sk        The sk of the socket
 989 * addrs     The pointer to the addresses
 990 * addrssize Size of the addrs buffer
 991 * op        Operation to perform (add or remove, see the flags of
 992 *           sctp_bindx)
 993 *
 994 * Returns 0 if ok, <0 errno code on error.
 995 */
 996static int sctp_setsockopt_bindx(struct sock *sk, struct sockaddr *addrs,
 997                                 int addrs_size, int op)
 998{
 999        int err;
1000        int addrcnt = 0;
1001        int walk_size = 0;
1002        struct sockaddr *sa_addr;
1003        void *addr_buf = addrs;
1004        struct sctp_af *af;
1005
1006        pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
1007                 __func__, sk, addr_buf, addrs_size, op);
1008
1009        if (unlikely(addrs_size <= 0))
1010                return -EINVAL;
1011
1012        /* Walk through the addrs buffer and count the number of addresses. */
1013        while (walk_size < addrs_size) {
1014                if (walk_size + sizeof(sa_family_t) > addrs_size)
1015                        return -EINVAL;
1016
1017                sa_addr = addr_buf;
1018                af = sctp_get_af_specific(sa_addr->sa_family);
1019
1020                /* If the address family is not supported or if this address
1021                 * causes the address buffer to overflow return EINVAL.
1022                 */
1023                if (!af || (walk_size + af->sockaddr_len) > addrs_size)
1024                        return -EINVAL;
1025                addrcnt++;
1026                addr_buf += af->sockaddr_len;
1027                walk_size += af->sockaddr_len;
1028        }
1029
1030        /* Do the work. */
1031        switch (op) {
1032        case SCTP_BINDX_ADD_ADDR:
1033                /* Allow security module to validate bindx addresses. */
1034                err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_BINDX_ADD,
1035                                                 addrs, addrs_size);
1036                if (err)
1037                        return err;
1038                err = sctp_bindx_add(sk, addrs, addrcnt);
1039                if (err)
1040                        return err;
1041                return sctp_send_asconf_add_ip(sk, addrs, addrcnt);
1042        case SCTP_BINDX_REM_ADDR:
1043                err = sctp_bindx_rem(sk, addrs, addrcnt);
1044                if (err)
1045                        return err;
1046                return sctp_send_asconf_del_ip(sk, addrs, addrcnt);
1047
1048        default:
1049                return -EINVAL;
1050        }
1051}
1052
1053static int sctp_bind_add(struct sock *sk, struct sockaddr *addrs,
1054                int addrlen)
1055{
1056        int err;
1057
1058        lock_sock(sk);
1059        err = sctp_setsockopt_bindx(sk, addrs, addrlen, SCTP_BINDX_ADD_ADDR);
1060        release_sock(sk);
1061        return err;
1062}
1063
1064static int sctp_connect_new_asoc(struct sctp_endpoint *ep,
1065                                 const union sctp_addr *daddr,
1066                                 const struct sctp_initmsg *init,
1067                                 struct sctp_transport **tp)
1068{
1069        struct sctp_association *asoc;
1070        struct sock *sk = ep->base.sk;
1071        struct net *net = sock_net(sk);
1072        enum sctp_scope scope;
1073        int err;
1074
1075        if (sctp_endpoint_is_peeled_off(ep, daddr))
1076                return -EADDRNOTAVAIL;
1077
1078        if (!ep->base.bind_addr.port) {
1079                if (sctp_autobind(sk))
1080                        return -EAGAIN;
1081        } else {
1082                if (inet_port_requires_bind_service(net, ep->base.bind_addr.port) &&
1083                    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
1084                        return -EACCES;
1085        }
1086
1087        scope = sctp_scope(daddr);
1088        asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
1089        if (!asoc)
1090                return -ENOMEM;
1091
1092        err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
1093        if (err < 0)
1094                goto free;
1095
1096        *tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1097        if (!*tp) {
1098                err = -ENOMEM;
1099                goto free;
1100        }
1101
1102        if (!init)
1103                return 0;
1104
1105        if (init->sinit_num_ostreams) {
1106                __u16 outcnt = init->sinit_num_ostreams;
1107
1108                asoc->c.sinit_num_ostreams = outcnt;
1109                /* outcnt has been changed, need to re-init stream */
1110                err = sctp_stream_init(&asoc->stream, outcnt, 0, GFP_KERNEL);
1111                if (err)
1112                        goto free;
1113        }
1114
1115        if (init->sinit_max_instreams)
1116                asoc->c.sinit_max_instreams = init->sinit_max_instreams;
1117
1118        if (init->sinit_max_attempts)
1119                asoc->max_init_attempts = init->sinit_max_attempts;
1120
1121        if (init->sinit_max_init_timeo)
1122                asoc->max_init_timeo =
1123                        msecs_to_jiffies(init->sinit_max_init_timeo);
1124
1125        return 0;
1126free:
1127        sctp_association_free(asoc);
1128        return err;
1129}
1130
1131static int sctp_connect_add_peer(struct sctp_association *asoc,
1132                                 union sctp_addr *daddr, int addr_len)
1133{
1134        struct sctp_endpoint *ep = asoc->ep;
1135        struct sctp_association *old;
1136        struct sctp_transport *t;
1137        int err;
1138
1139        err = sctp_verify_addr(ep->base.sk, daddr, addr_len);
1140        if (err)
1141                return err;
1142
1143        old = sctp_endpoint_lookup_assoc(ep, daddr, &t);
1144        if (old && old != asoc)
1145                return old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1146                                                            : -EALREADY;
1147
1148        if (sctp_endpoint_is_peeled_off(ep, daddr))
1149                return -EADDRNOTAVAIL;
1150
1151        t = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
1152        if (!t)
1153                return -ENOMEM;
1154
1155        return 0;
1156}
1157
1158/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
1159 *
1160 * Common routine for handling connect() and sctp_connectx().
1161 * Connect will come in with just a single address.
1162 */
1163static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,
1164                          int addrs_size, int flags, sctp_assoc_t *assoc_id)
1165{
1166        struct sctp_sock *sp = sctp_sk(sk);
1167        struct sctp_endpoint *ep = sp->ep;
1168        struct sctp_transport *transport;
1169        struct sctp_association *asoc;
1170        void *addr_buf = kaddrs;
1171        union sctp_addr *daddr;
1172        struct sctp_af *af;
1173        int walk_size, err;
1174        long timeo;
1175
1176        if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
1177            (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))
1178                return -EISCONN;
1179
1180        daddr = addr_buf;
1181        af = sctp_get_af_specific(daddr->sa.sa_family);
1182        if (!af || af->sockaddr_len > addrs_size)
1183                return -EINVAL;
1184
1185        err = sctp_verify_addr(sk, daddr, af->sockaddr_len);
1186        if (err)
1187                return err;
1188
1189        asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1190        if (asoc)
1191                return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN
1192                                                             : -EALREADY;
1193
1194        err = sctp_connect_new_asoc(ep, daddr, NULL, &transport);
1195        if (err)
1196                return err;
1197        asoc = transport->asoc;
1198
1199        addr_buf += af->sockaddr_len;
1200        walk_size = af->sockaddr_len;
1201        while (walk_size < addrs_size) {
1202                err = -EINVAL;
1203                if (walk_size + sizeof(sa_family_t) > addrs_size)
1204                        goto out_free;
1205
1206                daddr = addr_buf;
1207                af = sctp_get_af_specific(daddr->sa.sa_family);
1208                if (!af || af->sockaddr_len + walk_size > addrs_size)
1209                        goto out_free;
1210
1211                if (asoc->peer.port != ntohs(daddr->v4.sin_port))
1212                        goto out_free;
1213
1214                err = sctp_connect_add_peer(asoc, daddr, af->sockaddr_len);
1215                if (err)
1216                        goto out_free;
1217
1218                addr_buf  += af->sockaddr_len;
1219                walk_size += af->sockaddr_len;
1220        }
1221
1222        /* In case the user of sctp_connectx() wants an association
1223         * id back, assign one now.
1224         */
1225        if (assoc_id) {
1226                err = sctp_assoc_set_id(asoc, GFP_KERNEL);
1227                if (err < 0)
1228                        goto out_free;
1229        }
1230
1231        err = sctp_primitive_ASSOCIATE(sock_net(sk), asoc, NULL);
1232        if (err < 0)
1233                goto out_free;
1234
1235        /* Initialize sk's dport and daddr for getpeername() */
1236        inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1237        sp->pf->to_sk_daddr(daddr, sk);
1238        sk->sk_err = 0;
1239
1240        if (assoc_id)
1241                *assoc_id = asoc->assoc_id;
1242
1243        timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1244        return sctp_wait_for_connect(asoc, &timeo);
1245
1246out_free:
1247        pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
1248                 __func__, asoc, kaddrs, err);
1249        sctp_association_free(asoc);
1250        return err;
1251}
1252
1253/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
1254 *
1255 * API 8.9
1256 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
1257 *                      sctp_assoc_t *asoc);
1258 *
1259 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
1260 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
1261 * or IPv6 addresses.
1262 *
1263 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
1264 * Section 3.1.2 for this usage.
1265 *
1266 * addrs is a pointer to an array of one or more socket addresses. Each
1267 * address is contained in its appropriate structure (i.e. struct
1268 * sockaddr_in or struct sockaddr_in6) the family of the address type
1269 * must be used to distengish the address length (note that this
1270 * representation is termed a "packed array" of addresses). The caller
1271 * specifies the number of addresses in the array with addrcnt.
1272 *
1273 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
1274 * the association id of the new association.  On failure, sctp_connectx()
1275 * returns -1, and sets errno to the appropriate error code.  The assoc_id
1276 * is not touched by the kernel.
1277 *
1278 * For SCTP, the port given in each socket address must be the same, or
1279 * sctp_connectx() will fail, setting errno to EINVAL.
1280 *
1281 * An application can use sctp_connectx to initiate an association with
1282 * an endpoint that is multi-homed.  Much like sctp_bindx() this call
1283 * allows a caller to specify multiple addresses at which a peer can be
1284 * reached.  The way the SCTP stack uses the list of addresses to set up
1285 * the association is implementation dependent.  This function only
1286 * specifies that the stack will try to make use of all the addresses in
1287 * the list when needed.
1288 *
1289 * Note that the list of addresses passed in is only used for setting up
1290 * the association.  It does not necessarily equal the set of addresses
1291 * the peer uses for the resulting association.  If the caller wants to
1292 * find out the set of peer addresses, it must use sctp_getpaddrs() to
1293 * retrieve them after the association has been set up.
1294 *
1295 * Basically do nothing but copying the addresses from user to kernel
1296 * land and invoking either sctp_connectx(). This is used for tunneling
1297 * the sctp_connectx() request through sctp_setsockopt() from userspace.
1298 *
1299 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
1300 * it.
1301 *
1302 * sk        The sk of the socket
1303 * addrs     The pointer to the addresses
1304 * addrssize Size of the addrs buffer
1305 *
1306 * Returns >=0 if ok, <0 errno code on error.
1307 */
1308static int __sctp_setsockopt_connectx(struct sock *sk, struct sockaddr *kaddrs,
1309                                      int addrs_size, sctp_assoc_t *assoc_id)
1310{
1311        int err = 0, flags = 0;
1312
1313        pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
1314                 __func__, sk, kaddrs, addrs_size);
1315
1316        /* make sure the 1st addr's sa_family is accessible later */
1317        if (unlikely(addrs_size < sizeof(sa_family_t)))
1318                return -EINVAL;
1319
1320        /* Allow security module to validate connectx addresses. */
1321        err = security_sctp_bind_connect(sk, SCTP_SOCKOPT_CONNECTX,
1322                                         (struct sockaddr *)kaddrs,
1323                                          addrs_size);
1324        if (err)
1325                return err;
1326
1327        /* in-kernel sockets don't generally have a file allocated to them
1328         * if all they do is call sock_create_kern().
1329         */
1330        if (sk->sk_socket->file)
1331                flags = sk->sk_socket->file->f_flags;
1332
1333        return __sctp_connect(sk, kaddrs, addrs_size, flags, assoc_id);
1334}
1335
1336/*
1337 * This is an older interface.  It's kept for backward compatibility
1338 * to the option that doesn't provide association id.
1339 */
1340static int sctp_setsockopt_connectx_old(struct sock *sk,
1341                                        struct sockaddr *kaddrs,
1342                                        int addrs_size)
1343{
1344        return __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, NULL);
1345}
1346
1347/*
1348 * New interface for the API.  The since the API is done with a socket
1349 * option, to make it simple we feed back the association id is as a return
1350 * indication to the call.  Error is always negative and association id is
1351 * always positive.
1352 */
1353static int sctp_setsockopt_connectx(struct sock *sk,
1354                                    struct sockaddr *kaddrs,
1355                                    int addrs_size)
1356{
1357        sctp_assoc_t assoc_id = 0;
1358        int err = 0;
1359
1360        err = __sctp_setsockopt_connectx(sk, kaddrs, addrs_size, &assoc_id);
1361
1362        if (err)
1363                return err;
1364        else
1365                return assoc_id;
1366}
1367
1368/*
1369 * New (hopefully final) interface for the API.
1370 * We use the sctp_getaddrs_old structure so that use-space library
1371 * can avoid any unnecessary allocations. The only different part
1372 * is that we store the actual length of the address buffer into the
1373 * addrs_num structure member. That way we can re-use the existing
1374 * code.
1375 */
1376#ifdef CONFIG_COMPAT
1377struct compat_sctp_getaddrs_old {
1378        sctp_assoc_t    assoc_id;
1379        s32             addr_num;
1380        compat_uptr_t   addrs;          /* struct sockaddr * */
1381};
1382#endif
1383
1384static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1385                                     char __user *optval,
1386                                     int __user *optlen)
1387{
1388        struct sctp_getaddrs_old param;
1389        sctp_assoc_t assoc_id = 0;
1390        struct sockaddr *kaddrs;
1391        int err = 0;
1392
1393#ifdef CONFIG_COMPAT
1394        if (in_compat_syscall()) {
1395                struct compat_sctp_getaddrs_old param32;
1396
1397                if (len < sizeof(param32))
1398                        return -EINVAL;
1399                if (copy_from_user(&param32, optval, sizeof(param32)))
1400                        return -EFAULT;
1401
1402                param.assoc_id = param32.assoc_id;
1403                param.addr_num = param32.addr_num;
1404                param.addrs = compat_ptr(param32.addrs);
1405        } else
1406#endif
1407        {
1408                if (len < sizeof(param))
1409                        return -EINVAL;
1410                if (copy_from_user(&param, optval, sizeof(param)))
1411                        return -EFAULT;
1412        }
1413
1414        kaddrs = memdup_user(param.addrs, param.addr_num);
1415        if (IS_ERR(kaddrs))
1416                return PTR_ERR(kaddrs);
1417
1418        err = __sctp_setsockopt_connectx(sk, kaddrs, param.addr_num, &assoc_id);
1419        kfree(kaddrs);
1420        if (err == 0 || err == -EINPROGRESS) {
1421                if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
1422                        return -EFAULT;
1423                if (put_user(sizeof(assoc_id), optlen))
1424                        return -EFAULT;
1425        }
1426
1427        return err;
1428}
1429
1430/* API 3.1.4 close() - UDP Style Syntax
1431 * Applications use close() to perform graceful shutdown (as described in
1432 * Section 10.1 of [SCTP]) on ALL the associations currently represented
1433 * by a UDP-style socket.
1434 *
1435 * The syntax is
1436 *
1437 *   ret = close(int sd);
1438 *
1439 *   sd      - the socket descriptor of the associations to be closed.
1440 *
1441 * To gracefully shutdown a specific association represented by the
1442 * UDP-style socket, an application should use the sendmsg() call,
1443 * passing no user data, but including the appropriate flag in the
1444 * ancillary data (see Section xxxx).
1445 *
1446 * If sd in the close() call is a branched-off socket representing only
1447 * one association, the shutdown is performed on that association only.
1448 *
1449 * 4.1.6 close() - TCP Style Syntax
1450 *
1451 * Applications use close() to gracefully close down an association.
1452 *
1453 * The syntax is:
1454 *
1455 *    int close(int sd);
1456 *
1457 *      sd      - the socket descriptor of the association to be closed.
1458 *
1459 * After an application calls close() on a socket descriptor, no further
1460 * socket operations will succeed on that descriptor.
1461 *
1462 * API 7.1.4 SO_LINGER
1463 *
1464 * An application using the TCP-style socket can use this option to
1465 * perform the SCTP ABORT primitive.  The linger option structure is:
1466 *
1467 *  struct  linger {
1468 *     int     l_onoff;                // option on/off
1469 *     int     l_linger;               // linger time
1470 * };
1471 *
1472 * To enable the option, set l_onoff to 1.  If the l_linger value is set
1473 * to 0, calling close() is the same as the ABORT primitive.  If the
1474 * value is set to a negative value, the setsockopt() call will return
1475 * an error.  If the value is set to a positive value linger_time, the
1476 * close() can be blocked for at most linger_time ms.  If the graceful
1477 * shutdown phase does not finish during this period, close() will
1478 * return but the graceful shutdown phase continues in the system.
1479 */
1480static void sctp_close(struct sock *sk, long timeout)
1481{
1482        struct net *net = sock_net(sk);
1483        struct sctp_endpoint *ep;
1484        struct sctp_association *asoc;
1485        struct list_head *pos, *temp;
1486        unsigned int data_was_unread;
1487
1488        pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
1489
1490        lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1491        sk->sk_shutdown = SHUTDOWN_MASK;
1492        inet_sk_set_state(sk, SCTP_SS_CLOSING);
1493
1494        ep = sctp_sk(sk)->ep;
1495
1496        /* Clean up any skbs sitting on the receive queue.  */
1497        data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
1498        data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);
1499
1500        /* Walk all associations on an endpoint.  */
1501        list_for_each_safe(pos, temp, &ep->asocs) {
1502                asoc = list_entry(pos, struct sctp_association, asocs);
1503
1504                if (sctp_style(sk, TCP)) {
1505                        /* A closed association can still be in the list if
1506                         * it belongs to a TCP-style listening socket that is
1507                         * not yet accepted. If so, free it. If not, send an
1508                         * ABORT or SHUTDOWN based on the linger options.
1509                         */
1510                        if (sctp_state(asoc, CLOSED)) {
1511                                sctp_association_free(asoc);
1512                                continue;
1513                        }
1514                }
1515
1516                if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
1517                    !skb_queue_empty(&asoc->ulpq.reasm) ||
1518                    !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1519                    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1520                        struct sctp_chunk *chunk;
1521
1522                        chunk = sctp_make_abort_user(asoc, NULL, 0);
1523                        sctp_primitive_ABORT(net, asoc, chunk);
1524                } else
1525                        sctp_primitive_SHUTDOWN(net, asoc, NULL);
1526        }
1527
1528        /* On a TCP-style socket, block for at most linger_time if set. */
1529        if (sctp_style(sk, TCP) && timeout)
1530                sctp_wait_for_close(sk, timeout);
1531
1532        /* This will run the backlog queue.  */
1533        release_sock(sk);
1534
1535        /* Supposedly, no process has access to the socket, but
1536         * the net layers still may.
1537         * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
1538         * held and that should be grabbed before socket lock.
1539         */
1540        spin_lock_bh(&net->sctp.addr_wq_lock);
1541        bh_lock_sock_nested(sk);
1542
1543        /* Hold the sock, since sk_common_release() will put sock_put()
1544         * and we have just a little more cleanup.
1545         */
1546        sock_hold(sk);
1547        sk_common_release(sk);
1548
1549        bh_unlock_sock(sk);
1550        spin_unlock_bh(&net->sctp.addr_wq_lock);
1551
1552        sock_put(sk);
1553
1554        SCTP_DBG_OBJCNT_DEC(sock);
1555}
1556
1557/* Handle EPIPE error. */
1558static int sctp_error(struct sock *sk, int flags, int err)
1559{
1560        if (err == -EPIPE)
1561                err = sock_error(sk) ? : -EPIPE;
1562        if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
1563                send_sig(SIGPIPE, current, 0);
1564        return err;
1565}
1566
1567/* API 3.1.3 sendmsg() - UDP Style Syntax
1568 *
1569 * An application uses sendmsg() and recvmsg() calls to transmit data to
1570 * and receive data from its peer.
1571 *
1572 *  ssize_t sendmsg(int socket, const struct msghdr *message,
1573 *                  int flags);
1574 *
1575 *  socket  - the socket descriptor of the endpoint.
1576 *  message - pointer to the msghdr structure which contains a single
1577 *            user message and possibly some ancillary data.
1578 *
1579 *            See Section 5 for complete description of the data
1580 *            structures.
1581 *
1582 *  flags   - flags sent or received with the user message, see Section
1583 *            5 for complete description of the flags.
1584 *
1585 * Note:  This function could use a rewrite especially when explicit
1586 * connect support comes in.
1587 */
1588/* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */
1589
1590static int sctp_msghdr_parse(const struct msghdr *msg,
1591                             struct sctp_cmsgs *cmsgs);
1592
1593static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
1594                              struct sctp_sndrcvinfo *srinfo,
1595                              const struct msghdr *msg, size_t msg_len)
1596{
1597        __u16 sflags;
1598        int err;
1599
1600        if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
1601                return -EPIPE;
1602
1603        if (msg_len > sk->sk_sndbuf)
1604                return -EMSGSIZE;
1605
1606        memset(cmsgs, 0, sizeof(*cmsgs));
1607        err = sctp_msghdr_parse(msg, cmsgs);
1608        if (err) {
1609                pr_debug("%s: msghdr parse err:%x\n", __func__, err);
1610                return err;
1611        }
1612
1613        memset(srinfo, 0, sizeof(*srinfo));
1614        if (cmsgs->srinfo) {
1615                srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
1616                srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
1617                srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
1618                srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
1619                srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
1620                srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
1621        }
1622
1623        if (cmsgs->sinfo) {
1624                srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
1625                srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
1626                srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
1627                srinfo->sinfo_context = cmsgs->sinfo->snd_context;
1628                srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
1629        }
1630
1631        if (cmsgs->prinfo) {
1632                srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
1633                SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
1634                                   cmsgs->prinfo->pr_policy);
1635        }
1636
1637        sflags = srinfo->sinfo_flags;
1638        if (!sflags && msg_len)
1639                return 0;
1640
1641        if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
1642                return -EINVAL;
1643
1644        if (((sflags & SCTP_EOF) && msg_len > 0) ||
1645            (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
1646                return -EINVAL;
1647
1648        if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
1649                return -EINVAL;
1650
1651        return 0;
1652}
1653
1654static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
1655                                 struct sctp_cmsgs *cmsgs,
1656                                 union sctp_addr *daddr,
1657                                 struct sctp_transport **tp)
1658{
1659        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1660        struct sctp_association *asoc;
1661        struct cmsghdr *cmsg;
1662        __be32 flowinfo = 0;
1663        struct sctp_af *af;
1664        int err;
1665
1666        *tp = NULL;
1667
1668        if (sflags & (SCTP_EOF | SCTP_ABORT))
1669                return -EINVAL;
1670
1671        if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
1672                                    sctp_sstate(sk, CLOSING)))
1673                return -EADDRNOTAVAIL;
1674
1675        /* Label connection socket for first association 1-to-many
1676         * style for client sequence socket()->sendmsg(). This
1677         * needs to be done before sctp_assoc_add_peer() as that will
1678         * set up the initial packet that needs to account for any
1679         * security ip options (CIPSO/CALIPSO) added to the packet.
1680         */
1681        af = sctp_get_af_specific(daddr->sa.sa_family);
1682        if (!af)
1683                return -EINVAL;
1684        err = security_sctp_bind_connect(sk, SCTP_SENDMSG_CONNECT,
1685                                         (struct sockaddr *)daddr,
1686                                         af->sockaddr_len);
1687        if (err < 0)
1688                return err;
1689
1690        err = sctp_connect_new_asoc(ep, daddr, cmsgs->init, tp);
1691        if (err)
1692                return err;
1693        asoc = (*tp)->asoc;
1694
1695        if (!cmsgs->addrs_msg)
1696                return 0;
1697
1698        if (daddr->sa.sa_family == AF_INET6)
1699                flowinfo = daddr->v6.sin6_flowinfo;
1700
1701        /* sendv addr list parse */
1702        for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
1703                union sctp_addr _daddr;
1704                int dlen;
1705
1706                if (cmsg->cmsg_level != IPPROTO_SCTP ||
1707                    (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
1708                     cmsg->cmsg_type != SCTP_DSTADDRV6))
1709                        continue;
1710
1711                daddr = &_daddr;
1712                memset(daddr, 0, sizeof(*daddr));
1713                dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
1714                if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1715                        if (dlen < sizeof(struct in_addr)) {
1716                                err = -EINVAL;
1717                                goto free;
1718                        }
1719
1720                        dlen = sizeof(struct in_addr);
1721                        daddr->v4.sin_family = AF_INET;
1722                        daddr->v4.sin_port = htons(asoc->peer.port);
1723                        memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
1724                } else {
1725                        if (dlen < sizeof(struct in6_addr)) {
1726                                err = -EINVAL;
1727                                goto free;
1728                        }
1729
1730                        dlen = sizeof(struct in6_addr);
1731                        daddr->v6.sin6_flowinfo = flowinfo;
1732                        daddr->v6.sin6_family = AF_INET6;
1733                        daddr->v6.sin6_port = htons(asoc->peer.port);
1734                        memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
1735                }
1736
1737                err = sctp_connect_add_peer(asoc, daddr, sizeof(*daddr));
1738                if (err)
1739                        goto free;
1740        }
1741
1742        return 0;
1743
1744free:
1745        sctp_association_free(asoc);
1746        return err;
1747}
1748
1749static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
1750                                     __u16 sflags, struct msghdr *msg,
1751                                     size_t msg_len)
1752{
1753        struct sock *sk = asoc->base.sk;
1754        struct net *net = sock_net(sk);
1755
1756        if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
1757                return -EPIPE;
1758
1759        if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
1760            !sctp_state(asoc, ESTABLISHED))
1761                return 0;
1762
1763        if (sflags & SCTP_EOF) {
1764                pr_debug("%s: shutting down association:%p\n", __func__, asoc);
1765                sctp_primitive_SHUTDOWN(net, asoc, NULL);
1766
1767                return 0;
1768        }
1769
1770        if (sflags & SCTP_ABORT) {
1771                struct sctp_chunk *chunk;
1772
1773                chunk = sctp_make_abort_user(asoc, msg, msg_len);
1774                if (!chunk)
1775                        return -ENOMEM;
1776
1777                pr_debug("%s: aborting association:%p\n", __func__, asoc);
1778                sctp_primitive_ABORT(net, asoc, chunk);
1779                iov_iter_revert(&msg->msg_iter, msg_len);
1780
1781                return 0;
1782        }
1783
1784        return 1;
1785}
1786
1787static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
1788                                struct msghdr *msg, size_t msg_len,
1789                                struct sctp_transport *transport,
1790                                struct sctp_sndrcvinfo *sinfo)
1791{
1792        struct sock *sk = asoc->base.sk;
1793        struct sctp_sock *sp = sctp_sk(sk);
1794        struct net *net = sock_net(sk);
1795        struct sctp_datamsg *datamsg;
1796        bool wait_connect = false;
1797        struct sctp_chunk *chunk;
1798        long timeo;
1799        int err;
1800
1801        if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
1802                err = -EINVAL;
1803                goto err;
1804        }
1805
1806        if (unlikely(!SCTP_SO(&asoc->stream, sinfo->sinfo_stream)->ext)) {
1807                err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
1808                if (err)
1809                        goto err;
1810        }
1811
1812        if (sp->disable_fragments && msg_len > asoc->frag_point) {
1813                err = -EMSGSIZE;
1814                goto err;
1815        }
1816
1817        if (asoc->pmtu_pending) {
1818                if (sp->param_flags & SPP_PMTUD_ENABLE)
1819                        sctp_assoc_sync_pmtu(asoc);
1820                asoc->pmtu_pending = 0;
1821        }
1822
1823        if (sctp_wspace(asoc) < (int)msg_len)
1824                sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
1825
1826        if (sk_under_memory_pressure(sk))
1827                sk_mem_reclaim(sk);
1828
1829        if (sctp_wspace(asoc) <= 0 || !sk_wmem_schedule(sk, msg_len)) {
1830                timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1831                err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
1832                if (err)
1833                        goto err;
1834        }
1835
1836        if (sctp_state(asoc, CLOSED)) {
1837                err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
1838                if (err)
1839                        goto err;
1840
1841                if (asoc->ep->intl_enable) {
1842                        timeo = sock_sndtimeo(sk, 0);
1843                        err = sctp_wait_for_connect(asoc, &timeo);
1844                        if (err) {
1845                                err = -ESRCH;
1846                                goto err;
1847                        }
1848                } else {
1849                        wait_connect = true;
1850                }
1851
1852                pr_debug("%s: we associated primitively\n", __func__);
1853        }
1854
1855        datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
1856        if (IS_ERR(datamsg)) {
1857                err = PTR_ERR(datamsg);
1858                goto err;
1859        }
1860
1861        asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
1862
1863        list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
1864                sctp_chunk_hold(chunk);
1865                sctp_set_owner_w(chunk);
1866                chunk->transport = transport;
1867        }
1868
1869        err = sctp_primitive_SEND(net, asoc, datamsg);
1870        if (err) {
1871                sctp_datamsg_free(datamsg);
1872                goto err;
1873        }
1874
1875        pr_debug("%s: we sent primitively\n", __func__);
1876
1877        sctp_datamsg_put(datamsg);
1878
1879        if (unlikely(wait_connect)) {
1880                timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1881                sctp_wait_for_connect(asoc, &timeo);
1882        }
1883
1884        err = msg_len;
1885
1886err:
1887        return err;
1888}
1889
1890static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
1891                                               const struct msghdr *msg,
1892                                               struct sctp_cmsgs *cmsgs)
1893{
1894        union sctp_addr *daddr = NULL;
1895        int err;
1896
1897        if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
1898                int len = msg->msg_namelen;
1899
1900                if (len > sizeof(*daddr))
1901                        len = sizeof(*daddr);
1902
1903                daddr = (union sctp_addr *)msg->msg_name;
1904
1905                err = sctp_verify_addr(sk, daddr, len);
1906                if (err)
1907                        return ERR_PTR(err);
1908        }
1909
1910        return daddr;
1911}
1912
1913static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
1914                                      struct sctp_sndrcvinfo *sinfo,
1915                                      struct sctp_cmsgs *cmsgs)
1916{
1917        if (!cmsgs->srinfo && !cmsgs->sinfo) {
1918                sinfo->sinfo_stream = asoc->default_stream;
1919                sinfo->sinfo_ppid = asoc->default_ppid;
1920                sinfo->sinfo_context = asoc->default_context;
1921                sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1922
1923                if (!cmsgs->prinfo)
1924                        sinfo->sinfo_flags = asoc->default_flags;
1925        }
1926
1927        if (!cmsgs->srinfo && !cmsgs->prinfo)
1928                sinfo->sinfo_timetolive = asoc->default_timetolive;
1929
1930        if (cmsgs->authinfo) {
1931                /* Reuse sinfo_tsn to indicate that authinfo was set and
1932                 * sinfo_ssn to save the keyid on tx path.
1933                 */
1934                sinfo->sinfo_tsn = 1;
1935                sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
1936        }
1937}
1938
1939static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
1940{
1941        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1942        struct sctp_transport *transport = NULL;
1943        struct sctp_sndrcvinfo _sinfo, *sinfo;
1944        struct sctp_association *asoc, *tmp;
1945        struct sctp_cmsgs cmsgs;
1946        union sctp_addr *daddr;
1947        bool new = false;
1948        __u16 sflags;
1949        int err;
1950
1951        /* Parse and get snd_info */
1952        err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
1953        if (err)
1954                goto out;
1955
1956        sinfo  = &_sinfo;
1957        sflags = sinfo->sinfo_flags;
1958
1959        /* Get daddr from msg */
1960        daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
1961        if (IS_ERR(daddr)) {
1962                err = PTR_ERR(daddr);
1963                goto out;
1964        }
1965
1966        lock_sock(sk);
1967
1968        /* SCTP_SENDALL process */
1969        if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
1970                list_for_each_entry_safe(asoc, tmp, &ep->asocs, asocs) {
1971                        err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1972                                                        msg_len);
1973                        if (err == 0)
1974                                continue;
1975                        if (err < 0)
1976                                goto out_unlock;
1977
1978                        sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
1979
1980                        err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
1981                                                   NULL, sinfo);
1982                        if (err < 0)
1983                                goto out_unlock;
1984
1985                        iov_iter_revert(&msg->msg_iter, err);
1986                }
1987
1988                goto out_unlock;
1989        }
1990
1991        /* Get and check or create asoc */
1992        if (daddr) {
1993                asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
1994                if (asoc) {
1995                        err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
1996                                                        msg_len);
1997                        if (err <= 0)
1998                                goto out_unlock;
1999                } else {
2000                        err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
2001                                                    &transport);
2002                        if (err)
2003                                goto out_unlock;
2004
2005                        asoc = transport->asoc;
2006                        new = true;
2007                }
2008
2009                if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
2010                        transport = NULL;
2011        } else {
2012                asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
2013                if (!asoc) {
2014                        err = -EPIPE;
2015                        goto out_unlock;
2016                }
2017
2018                err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2019                if (err <= 0)
2020                        goto out_unlock;
2021        }
2022
2023        /* Update snd_info with the asoc */
2024        sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
2025
2026        /* Send msg to the asoc */
2027        err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2028        if (err < 0 && err != -ESRCH && new)
2029                sctp_association_free(asoc);
2030
2031out_unlock:
2032        release_sock(sk);
2033out:
2034        return sctp_error(sk, msg->msg_flags, err);
2035}
2036
2037/* This is an extended version of skb_pull() that removes the data from the
2038 * start of a skb even when data is spread across the list of skb's in the
2039 * frag_list. len specifies the total amount of data that needs to be removed.
2040 * when 'len' bytes could be removed from the skb, it returns 0.
2041 * If 'len' exceeds the total skb length,  it returns the no. of bytes that
2042 * could not be removed.
2043 */
2044static int sctp_skb_pull(struct sk_buff *skb, int len)
2045{
2046        struct sk_buff *list;
2047        int skb_len = skb_headlen(skb);
2048        int rlen;
2049
2050        if (len <= skb_len) {
2051                __skb_pull(skb, len);
2052                return 0;
2053        }
2054        len -= skb_len;
2055        __skb_pull(skb, skb_len);
2056
2057        skb_walk_frags(skb, list) {
2058                rlen = sctp_skb_pull(list, len);
2059                skb->len -= (len-rlen);
2060                skb->data_len -= (len-rlen);
2061
2062                if (!rlen)
2063                        return 0;
2064
2065                len = rlen;
2066        }
2067
2068        return len;
2069}
2070
2071/* API 3.1.3  recvmsg() - UDP Style Syntax
2072 *
2073 *  ssize_t recvmsg(int socket, struct msghdr *message,
2074 *                    int flags);
2075 *
2076 *  socket  - the socket descriptor of the endpoint.
2077 *  message - pointer to the msghdr structure which contains a single
2078 *            user message and possibly some ancillary data.
2079 *
2080 *            See Section 5 for complete description of the data
2081 *            structures.
2082 *
2083 *  flags   - flags sent or received with the user message, see Section
2084 *            5 for complete description of the flags.
2085 */
2086static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
2087                        int noblock, int flags, int *addr_len)
2088{
2089        struct sctp_ulpevent *event = NULL;
2090        struct sctp_sock *sp = sctp_sk(sk);
2091        struct sk_buff *skb, *head_skb;
2092        int copied;
2093        int err = 0;
2094        int skb_len;
2095
2096        pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
2097                 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
2098                 addr_len);
2099
2100        lock_sock(sk);
2101
2102        if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2103            !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
2104                err = -ENOTCONN;
2105                goto out;
2106        }
2107
2108        skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
2109        if (!skb)
2110                goto out;
2111
2112        /* Get the total length of the skb including any skb's in the
2113         * frag_list.
2114         */
2115        skb_len = skb->len;
2116
2117        copied = skb_len;
2118        if (copied > len)
2119                copied = len;
2120
2121        err = skb_copy_datagram_msg(skb, 0, msg, copied);
2122
2123        event = sctp_skb2event(skb);
2124
2125        if (err)
2126                goto out_free;
2127
2128        if (event->chunk && event->chunk->head_skb)
2129                head_skb = event->chunk->head_skb;
2130        else
2131                head_skb = skb;
2132        sock_recv_ts_and_drops(msg, sk, head_skb);
2133        if (sctp_ulpevent_is_notification(event)) {
2134                msg->msg_flags |= MSG_NOTIFICATION;
2135                sp->pf->event_msgname(event, msg->msg_name, addr_len);
2136        } else {
2137                sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
2138        }
2139
2140        /* Check if we allow SCTP_NXTINFO. */
2141        if (sp->recvnxtinfo)
2142                sctp_ulpevent_read_nxtinfo(event, msg, sk);
2143        /* Check if we allow SCTP_RCVINFO. */
2144        if (sp->recvrcvinfo)
2145                sctp_ulpevent_read_rcvinfo(event, msg);
2146        /* Check if we allow SCTP_SNDRCVINFO. */
2147        if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_DATA_IO_EVENT))
2148                sctp_ulpevent_read_sndrcvinfo(event, msg);
2149
2150        err = copied;
2151
2152        /* If skb's length exceeds the user's buffer, update the skb and
2153         * push it back to the receive_queue so that the next call to
2154         * recvmsg() will return the remaining data. Don't set MSG_EOR.
2155         */
2156        if (skb_len > copied) {
2157                msg->msg_flags &= ~MSG_EOR;
2158                if (flags & MSG_PEEK)
2159                        goto out_free;
2160                sctp_skb_pull(skb, copied);
2161                skb_queue_head(&sk->sk_receive_queue, skb);
2162
2163                /* When only partial message is copied to the user, increase
2164                 * rwnd by that amount. If all the data in the skb is read,
2165                 * rwnd is updated when the event is freed.
2166                 */
2167                if (!sctp_ulpevent_is_notification(event))
2168                        sctp_assoc_rwnd_increase(event->asoc, copied);
2169                goto out;
2170        } else if ((event->msg_flags & MSG_NOTIFICATION) ||
2171                   (event->msg_flags & MSG_EOR))
2172                msg->msg_flags |= MSG_EOR;
2173        else
2174                msg->msg_flags &= ~MSG_EOR;
2175
2176out_free:
2177        if (flags & MSG_PEEK) {
2178                /* Release the skb reference acquired after peeking the skb in
2179                 * sctp_skb_recv_datagram().
2180                 */
2181                kfree_skb(skb);
2182        } else {
2183                /* Free the event which includes releasing the reference to
2184                 * the owner of the skb, freeing the skb and updating the
2185                 * rwnd.
2186                 */
2187                sctp_ulpevent_free(event);
2188        }
2189out:
2190        release_sock(sk);
2191        return err;
2192}
2193
2194/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
2195 *
2196 * This option is a on/off flag.  If enabled no SCTP message
2197 * fragmentation will be performed.  Instead if a message being sent
2198 * exceeds the current PMTU size, the message will NOT be sent and
2199 * instead a error will be indicated to the user.
2200 */
2201static int sctp_setsockopt_disable_fragments(struct sock *sk, int *val,
2202                                             unsigned int optlen)
2203{
2204        if (optlen < sizeof(int))
2205                return -EINVAL;
2206        sctp_sk(sk)->disable_fragments = (*val == 0) ? 0 : 1;
2207        return 0;
2208}
2209
2210static int sctp_setsockopt_events(struct sock *sk, __u8 *sn_type,
2211                                  unsigned int optlen)
2212{
2213        struct sctp_sock *sp = sctp_sk(sk);
2214        struct sctp_association *asoc;
2215        int i;
2216
2217        if (optlen > sizeof(struct sctp_event_subscribe))
2218                return -EINVAL;
2219
2220        for (i = 0; i < optlen; i++)
2221                sctp_ulpevent_type_set(&sp->subscribe, SCTP_SN_TYPE_BASE + i,
2222                                       sn_type[i]);
2223
2224        list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2225                asoc->subscribe = sctp_sk(sk)->subscribe;
2226
2227        /* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2228         * if there is no data to be sent or retransmit, the stack will
2229         * immediately send up this notification.
2230         */
2231        if (sctp_ulpevent_type_enabled(sp->subscribe, SCTP_SENDER_DRY_EVENT)) {
2232                struct sctp_ulpevent *event;
2233
2234                asoc = sctp_id2assoc(sk, 0);
2235                if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
2236                        event = sctp_ulpevent_make_sender_dry_event(asoc,
2237                                        GFP_USER | __GFP_NOWARN);
2238                        if (!event)
2239                                return -ENOMEM;
2240
2241                        asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2242                }
2243        }
2244
2245        return 0;
2246}
2247
2248/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
2249 *
2250 * This socket option is applicable to the UDP-style socket only.  When
2251 * set it will cause associations that are idle for more than the
2252 * specified number of seconds to automatically close.  An association
2253 * being idle is defined an association that has NOT sent or received
2254 * user data.  The special value of '0' indicates that no automatic
2255 * close of any associations should be performed.  The option expects an
2256 * integer defining the number of seconds of idle time before an
2257 * association is closed.
2258 */
2259static int sctp_setsockopt_autoclose(struct sock *sk, u32 *optval,
2260                                     unsigned int optlen)
2261{
2262        struct sctp_sock *sp = sctp_sk(sk);
2263        struct net *net = sock_net(sk);
2264
2265        /* Applicable to UDP-style socket only */
2266        if (sctp_style(sk, TCP))
2267                return -EOPNOTSUPP;
2268        if (optlen != sizeof(int))
2269                return -EINVAL;
2270
2271        sp->autoclose = *optval;
2272        if (sp->autoclose > net->sctp.max_autoclose)
2273                sp->autoclose = net->sctp.max_autoclose;
2274
2275        return 0;
2276}
2277
2278/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
2279 *
2280 * Applications can enable or disable heartbeats for any peer address of
2281 * an association, modify an address's heartbeat interval, force a
2282 * heartbeat to be sent immediately, and adjust the address's maximum
2283 * number of retransmissions sent before an address is considered
2284 * unreachable.  The following structure is used to access and modify an
2285 * address's parameters:
2286 *
2287 *  struct sctp_paddrparams {
2288 *     sctp_assoc_t            spp_assoc_id;
2289 *     struct sockaddr_storage spp_address;
2290 *     uint32_t                spp_hbinterval;
2291 *     uint16_t                spp_pathmaxrxt;
2292 *     uint32_t                spp_pathmtu;
2293 *     uint32_t                spp_sackdelay;
2294 *     uint32_t                spp_flags;
2295 *     uint32_t                spp_ipv6_flowlabel;
2296 *     uint8_t                 spp_dscp;
2297 * };
2298 *
2299 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
2300 *                     application, and identifies the association for
2301 *                     this query.
2302 *   spp_address     - This specifies which address is of interest.
2303 *   spp_hbinterval  - This contains the value of the heartbeat interval,
2304 *                     in milliseconds.  If a  value of zero
2305 *                     is present in this field then no changes are to
2306 *                     be made to this parameter.
2307 *   spp_pathmaxrxt  - This contains the maximum number of
2308 *                     retransmissions before this address shall be
2309 *                     considered unreachable. If a  value of zero
2310 *                     is present in this field then no changes are to
2311 *                     be made to this parameter.
2312 *   spp_pathmtu     - When Path MTU discovery is disabled the value
2313 *                     specified here will be the "fixed" path mtu.
2314 *                     Note that if the spp_address field is empty
2315 *                     then all associations on this address will
2316 *                     have this fixed path mtu set upon them.
2317 *
2318 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
2319 *                     the number of milliseconds that sacks will be delayed
2320 *                     for. This value will apply to all addresses of an
2321 *                     association if the spp_address field is empty. Note
2322 *                     also, that if delayed sack is enabled and this
2323 *                     value is set to 0, no change is made to the last
2324 *                     recorded delayed sack timer value.
2325 *
2326 *   spp_flags       - These flags are used to control various features
2327 *                     on an association. The flag field may contain
2328 *                     zero or more of the following options.
2329 *
2330 *                     SPP_HB_ENABLE  - Enable heartbeats on the
2331 *                     specified address. Note that if the address
2332 *                     field is empty all addresses for the association
2333 *                     have heartbeats enabled upon them.
2334 *
2335 *                     SPP_HB_DISABLE - Disable heartbeats on the
2336 *                     speicifed address. Note that if the address
2337 *                     field is empty all addresses for the association
2338 *                     will have their heartbeats disabled. Note also
2339 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
2340 *                     mutually exclusive, only one of these two should
2341 *                     be specified. Enabling both fields will have
2342 *                     undetermined results.
2343 *
2344 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
2345 *                     to be made immediately.
2346 *
2347 *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
2348 *                     heartbeat delayis to be set to the value of 0
2349 *                     milliseconds.
2350 *
2351 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
2352 *                     discovery upon the specified address. Note that
2353 *                     if the address feild is empty then all addresses
2354 *                     on the association are effected.
2355 *
2356 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
2357 *                     discovery upon the specified address. Note that
2358 *                     if the address feild is empty then all addresses
2359 *                     on the association are effected. Not also that
2360 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
2361 *                     exclusive. Enabling both will have undetermined
2362 *                     results.
2363 *
2364 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
2365 *                     on delayed sack. The time specified in spp_sackdelay
2366 *                     is used to specify the sack delay for this address. Note
2367 *                     that if spp_address is empty then all addresses will
2368 *                     enable delayed sack and take on the sack delay
2369 *                     value specified in spp_sackdelay.
2370 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
2371 *                     off delayed sack. If the spp_address field is blank then
2372 *                     delayed sack is disabled for the entire association. Note
2373 *                     also that this field is mutually exclusive to
2374 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
2375 *                     results.
2376 *
2377 *                     SPP_IPV6_FLOWLABEL:  Setting this flag enables the
2378 *                     setting of the IPV6 flow label value.  The value is
2379 *                     contained in the spp_ipv6_flowlabel field.
2380 *                     Upon retrieval, this flag will be set to indicate that
2381 *                     the spp_ipv6_flowlabel field has a valid value returned.
2382 *                     If a specific destination address is set (in the
2383 *                     spp_address field), then the value returned is that of
2384 *                     the address.  If just an association is specified (and
2385 *                     no address), then the association's default flow label
2386 *                     is returned.  If neither an association nor a destination
2387 *                     is specified, then the socket's default flow label is
2388 *                     returned.  For non-IPv6 sockets, this flag will be left
2389 *                     cleared.
2390 *
2391 *                     SPP_DSCP:  Setting this flag enables the setting of the
2392 *                     Differentiated Services Code Point (DSCP) value
2393 *                     associated with either the association or a specific
2394 *                     address.  The value is obtained in the spp_dscp field.
2395 *                     Upon retrieval, this flag will be set to indicate that
2396 *                     the spp_dscp field has a valid value returned.  If a
2397 *                     specific destination address is set when called (in the
2398 *                     spp_address field), then that specific destination
2399 *                     address's DSCP value is returned.  If just an association
2400 *                     is specified, then the association's default DSCP is
2401 *                     returned.  If neither an association nor a destination is
2402 *                     specified, then the socket's default DSCP is returned.
2403 *
2404 *   spp_ipv6_flowlabel
2405 *                   - This field is used in conjunction with the
2406 *                     SPP_IPV6_FLOWLABEL flag and contains the IPv6 flow label.
2407 *                     The 20 least significant bits are used for the flow
2408 *                     label.  This setting has precedence over any IPv6-layer
2409 *                     setting.
2410 *
2411 *   spp_dscp        - This field is used in conjunction with the SPP_DSCP flag
2412 *                     and contains the DSCP.  The 6 most significant bits are
2413 *                     used for the DSCP.  This setting has precedence over any
2414 *                     IPv4- or IPv6- layer setting.
2415 */
2416static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
2417                                       struct sctp_transport   *trans,
2418                                       struct sctp_association *asoc,
2419                                       struct sctp_sock        *sp,
2420                                       int                      hb_change,
2421                                       int                      pmtud_change,
2422                                       int                      sackdelay_change)
2423{
2424        int error;
2425
2426        if (params->spp_flags & SPP_HB_DEMAND && trans) {
2427                error = sctp_primitive_REQUESTHEARTBEAT(trans->asoc->base.net,
2428                                                        trans->asoc, trans);
2429                if (error)
2430                        return error;
2431        }
2432
2433        /* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
2434         * this field is ignored.  Note also that a value of zero indicates
2435         * the current setting should be left unchanged.
2436         */
2437        if (params->spp_flags & SPP_HB_ENABLE) {
2438
2439                /* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
2440                 * set.  This lets us use 0 value when this flag
2441                 * is set.
2442                 */
2443                if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
2444                        params->spp_hbinterval = 0;
2445
2446                if (params->spp_hbinterval ||
2447                    (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
2448                        if (trans) {
2449                                trans->hbinterval =
2450                                    msecs_to_jiffies(params->spp_hbinterval);
2451                        } else if (asoc) {
2452                                asoc->hbinterval =
2453                                    msecs_to_jiffies(params->spp_hbinterval);
2454                        } else {
2455                                sp->hbinterval = params->spp_hbinterval;
2456                        }
2457                }
2458        }
2459
2460        if (hb_change) {
2461                if (trans) {
2462                        trans->param_flags =
2463                                (trans->param_flags & ~SPP_HB) | hb_change;
2464                } else if (asoc) {
2465                        asoc->param_flags =
2466                                (asoc->param_flags & ~SPP_HB) | hb_change;
2467                } else {
2468                        sp->param_flags =
2469                                (sp->param_flags & ~SPP_HB) | hb_change;
2470                }
2471        }
2472
2473        /* When Path MTU discovery is disabled the value specified here will
2474         * be the "fixed" path mtu (i.e. the value of the spp_flags field must
2475         * include the flag SPP_PMTUD_DISABLE for this field to have any
2476         * effect).
2477         */
2478        if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2479                if (trans) {
2480                        trans->pathmtu = params->spp_pathmtu;
2481                        sctp_assoc_sync_pmtu(asoc);
2482                } else if (asoc) {
2483                        sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
2484                } else {
2485                        sp->pathmtu = params->spp_pathmtu;
2486                }
2487        }
2488
2489        if (pmtud_change) {
2490                if (trans) {
2491                        int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
2492                                (params->spp_flags & SPP_PMTUD_ENABLE);
2493                        trans->param_flags =
2494                                (trans->param_flags & ~SPP_PMTUD) | pmtud_change;
2495                        if (update) {
2496                                sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2497                                sctp_assoc_sync_pmtu(asoc);
2498                        }
2499                        sctp_transport_pl_reset(trans);
2500                } else if (asoc) {
2501                        asoc->param_flags =
2502                                (asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
2503                } else {
2504                        sp->param_flags =
2505                                (sp->param_flags & ~SPP_PMTUD) | pmtud_change;
2506                }
2507        }
2508
2509        /* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
2510         * value of this field is ignored.  Note also that a value of zero
2511         * indicates the current setting should be left unchanged.
2512         */
2513        if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2514                if (trans) {
2515                        trans->sackdelay =
2516                                msecs_to_jiffies(params->spp_sackdelay);
2517                } else if (asoc) {
2518                        asoc->sackdelay =
2519                                msecs_to_jiffies(params->spp_sackdelay);
2520                } else {
2521                        sp->sackdelay = params->spp_sackdelay;
2522                }
2523        }
2524
2525        if (sackdelay_change) {
2526                if (trans) {
2527                        trans->param_flags =
2528                                (trans->param_flags & ~SPP_SACKDELAY) |
2529                                sackdelay_change;
2530                } else if (asoc) {
2531                        asoc->param_flags =
2532                                (asoc->param_flags & ~SPP_SACKDELAY) |
2533                                sackdelay_change;
2534                } else {
2535                        sp->param_flags =
2536                                (sp->param_flags & ~SPP_SACKDELAY) |
2537                                sackdelay_change;
2538                }
2539        }
2540
2541        /* Note that a value of zero indicates the current setting should be
2542           left unchanged.
2543         */
2544        if (params->spp_pathmaxrxt) {
2545                if (trans) {
2546                        trans->pathmaxrxt = params->spp_pathmaxrxt;
2547                } else if (asoc) {
2548                        asoc->pathmaxrxt = params->spp_pathmaxrxt;
2549                } else {
2550                        sp->pathmaxrxt = params->spp_pathmaxrxt;
2551                }
2552        }
2553
2554        if (params->spp_flags & SPP_IPV6_FLOWLABEL) {
2555                if (trans) {
2556                        if (trans->ipaddr.sa.sa_family == AF_INET6) {
2557                                trans->flowlabel = params->spp_ipv6_flowlabel &
2558                                                   SCTP_FLOWLABEL_VAL_MASK;
2559                                trans->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2560                        }
2561                } else if (asoc) {
2562                        struct sctp_transport *t;
2563
2564                        list_for_each_entry(t, &asoc->peer.transport_addr_list,
2565                                            transports) {
2566                                if (t->ipaddr.sa.sa_family != AF_INET6)
2567                                        continue;
2568                                t->flowlabel = params->spp_ipv6_flowlabel &
2569                                               SCTP_FLOWLABEL_VAL_MASK;
2570                                t->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2571                        }
2572                        asoc->flowlabel = params->spp_ipv6_flowlabel &
2573                                          SCTP_FLOWLABEL_VAL_MASK;
2574                        asoc->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2575                } else if (sctp_opt2sk(sp)->sk_family == AF_INET6) {
2576                        sp->flowlabel = params->spp_ipv6_flowlabel &
2577                                        SCTP_FLOWLABEL_VAL_MASK;
2578                        sp->flowlabel |= SCTP_FLOWLABEL_SET_MASK;
2579                }
2580        }
2581
2582        if (params->spp_flags & SPP_DSCP) {
2583                if (trans) {
2584                        trans->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2585                        trans->dscp |= SCTP_DSCP_SET_MASK;
2586                } else if (asoc) {
2587                        struct sctp_transport *t;
2588
2589                        list_for_each_entry(t, &asoc->peer.transport_addr_list,
2590                                            transports) {
2591                                t->dscp = params->spp_dscp &
2592                                          SCTP_DSCP_VAL_MASK;
2593                                t->dscp |= SCTP_DSCP_SET_MASK;
2594                        }
2595                        asoc->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2596                        asoc->dscp |= SCTP_DSCP_SET_MASK;
2597                } else {
2598                        sp->dscp = params->spp_dscp & SCTP_DSCP_VAL_MASK;
2599                        sp->dscp |= SCTP_DSCP_SET_MASK;
2600                }
2601        }
2602
2603        return 0;
2604}
2605
2606static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2607                                            struct sctp_paddrparams *params,
2608                                            unsigned int optlen)
2609{
2610        struct sctp_transport   *trans = NULL;
2611        struct sctp_association *asoc = NULL;
2612        struct sctp_sock        *sp = sctp_sk(sk);
2613        int error;
2614        int hb_change, pmtud_change, sackdelay_change;
2615
2616        if (optlen == ALIGN(offsetof(struct sctp_paddrparams,
2617                                            spp_ipv6_flowlabel), 4)) {
2618                if (params->spp_flags & (SPP_DSCP | SPP_IPV6_FLOWLABEL))
2619                        return -EINVAL;
2620        } else if (optlen != sizeof(*params)) {
2621                return -EINVAL;
2622        }
2623
2624        /* Validate flags and value parameters. */
2625        hb_change        = params->spp_flags & SPP_HB;
2626        pmtud_change     = params->spp_flags & SPP_PMTUD;
2627        sackdelay_change = params->spp_flags & SPP_SACKDELAY;
2628
2629        if (hb_change        == SPP_HB ||
2630            pmtud_change     == SPP_PMTUD ||
2631            sackdelay_change == SPP_SACKDELAY ||
2632            params->spp_sackdelay > 500 ||
2633            (params->spp_pathmtu &&
2634             params->spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2635                return -EINVAL;
2636
2637        /* If an address other than INADDR_ANY is specified, and
2638         * no transport is found, then the request is invalid.
2639         */
2640        if (!sctp_is_any(sk, (union sctp_addr *)&params->spp_address)) {
2641                trans = sctp_addr_id2transport(sk, &params->spp_address,
2642                                               params->spp_assoc_id);
2643                if (!trans)
2644                        return -EINVAL;
2645        }
2646
2647        /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
2648         * socket is a one to many style socket, and an association
2649         * was not found, then the id was invalid.
2650         */
2651        asoc = sctp_id2assoc(sk, params->spp_assoc_id);
2652        if (!asoc && params->spp_assoc_id != SCTP_FUTURE_ASSOC &&
2653            sctp_style(sk, UDP))
2654                return -EINVAL;
2655
2656        /* Heartbeat demand can only be sent on a transport or
2657         * association, but not a socket.
2658         */
2659        if (params->spp_flags & SPP_HB_DEMAND && !trans && !asoc)
2660                return -EINVAL;
2661
2662        /* Process parameters. */
2663        error = sctp_apply_peer_addr_params(params, trans, asoc, sp,
2664                                            hb_change, pmtud_change,
2665                                            sackdelay_change);
2666
2667        if (error)
2668                return error;
2669
2670        /* If changes are for association, also apply parameters to each
2671         * transport.
2672         */
2673        if (!trans && asoc) {
2674                list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2675                                transports) {
2676                        sctp_apply_peer_addr_params(params, trans, asoc, sp,
2677                                                    hb_change, pmtud_change,
2678                                                    sackdelay_change);
2679                }
2680        }
2681
2682        return 0;
2683}
2684
2685static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
2686{
2687        return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
2688}
2689
2690static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
2691{
2692        return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
2693}
2694
2695static void sctp_apply_asoc_delayed_ack(struct sctp_sack_info *params,
2696                                        struct sctp_association *asoc)
2697{
2698        struct sctp_transport *trans;
2699
2700        if (params->sack_delay) {
2701                asoc->sackdelay = msecs_to_jiffies(params->sack_delay);
2702                asoc->param_flags =
2703                        sctp_spp_sackdelay_enable(asoc->param_flags);
2704        }
2705        if (params->sack_freq == 1) {
2706                asoc->param_flags =
2707                        sctp_spp_sackdelay_disable(asoc->param_flags);
2708        } else if (params->sack_freq > 1) {
2709                asoc->sackfreq = params->sack_freq;
2710                asoc->param_flags =
2711                        sctp_spp_sackdelay_enable(asoc->param_flags);
2712        }
2713
2714        list_for_each_entry(trans, &asoc->peer.transport_addr_list,
2715                            transports) {
2716                if (params->sack_delay) {
2717                        trans->sackdelay = msecs_to_jiffies(params->sack_delay);
2718                        trans->param_flags =
2719                                sctp_spp_sackdelay_enable(trans->param_flags);
2720                }
2721                if (params->sack_freq == 1) {
2722                        trans->param_flags =
2723                                sctp_spp_sackdelay_disable(trans->param_flags);
2724                } else if (params->sack_freq > 1) {
2725                        trans->sackfreq = params->sack_freq;
2726                        trans->param_flags =
2727                                sctp_spp_sackdelay_enable(trans->param_flags);
2728                }
2729        }
2730}
2731
2732/*
2733 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
2734 *
2735 * This option will effect the way delayed acks are performed.  This
2736 * option allows you to get or set the delayed ack time, in
2737 * milliseconds.  It also allows changing the delayed ack frequency.
2738 * Changing the frequency to 1 disables the delayed sack algorithm.  If
2739 * the assoc_id is 0, then this sets or gets the endpoints default
2740 * values.  If the assoc_id field is non-zero, then the set or get
2741 * effects the specified association for the one to many model (the
2742 * assoc_id field is ignored by the one to one model).  Note that if
2743 * sack_delay or sack_freq are 0 when setting this option, then the
2744 * current values will remain unchanged.
2745 *
2746 * struct sctp_sack_info {
2747 *     sctp_assoc_t            sack_assoc_id;
2748 *     uint32_t                sack_delay;
2749 *     uint32_t                sack_freq;
2750 * };
2751 *
2752 * sack_assoc_id -  This parameter, indicates which association the user
2753 *    is performing an action upon.  Note that if this field's value is
2754 *    zero then the endpoints default value is changed (effecting future
2755 *    associations only).
2756 *
2757 * sack_delay -  This parameter contains the number of milliseconds that
2758 *    the user is requesting the delayed ACK timer be set to.  Note that
2759 *    this value is defined in the standard to be between 200 and 500
2760 *    milliseconds.
2761 *
2762 * sack_freq -  This parameter contains the number of packets that must
2763 *    be received before a sack is sent without waiting for the delay
2764 *    timer to expire.  The default value for this is 2, setting this
2765 *    value to 1 will disable the delayed sack algorithm.
2766 */
2767static int __sctp_setsockopt_delayed_ack(struct sock *sk,
2768                                         struct sctp_sack_info *params)
2769{
2770        struct sctp_sock *sp = sctp_sk(sk);
2771        struct sctp_association *asoc;
2772
2773        /* Validate value parameter. */
2774        if (params->sack_delay > 500)
2775                return -EINVAL;
2776
2777        /* Get association, if sack_assoc_id != SCTP_FUTURE_ASSOC and the
2778         * socket is a one to many style socket, and an association
2779         * was not found, then the id was invalid.
2780         */
2781        asoc = sctp_id2assoc(sk, params->sack_assoc_id);
2782        if (!asoc && params->sack_assoc_id > SCTP_ALL_ASSOC &&
2783            sctp_style(sk, UDP))
2784                return -EINVAL;
2785
2786        if (asoc) {
2787                sctp_apply_asoc_delayed_ack(params, asoc);
2788
2789                return 0;
2790        }
2791
2792        if (sctp_style(sk, TCP))
2793                params->sack_assoc_id = SCTP_FUTURE_ASSOC;
2794
2795        if (params->sack_assoc_id == SCTP_FUTURE_ASSOC ||
2796            params->sack_assoc_id == SCTP_ALL_ASSOC) {
2797                if (params->sack_delay) {
2798                        sp->sackdelay = params->sack_delay;
2799                        sp->param_flags =
2800                                sctp_spp_sackdelay_enable(sp->param_flags);
2801                }
2802                if (params->sack_freq == 1) {
2803                        sp->param_flags =
2804                                sctp_spp_sackdelay_disable(sp->param_flags);
2805                } else if (params->sack_freq > 1) {
2806                        sp->sackfreq = params->sack_freq;
2807                        sp->param_flags =
2808                                sctp_spp_sackdelay_enable(sp->param_flags);
2809                }
2810        }
2811
2812        if (params->sack_assoc_id == SCTP_CURRENT_ASSOC ||
2813            params->sack_assoc_id == SCTP_ALL_ASSOC)
2814                list_for_each_entry(asoc, &sp->ep->asocs, asocs)
2815                        sctp_apply_asoc_delayed_ack(params, asoc);
2816
2817        return 0;
2818}
2819
2820static int sctp_setsockopt_delayed_ack(struct sock *sk,
2821                                       struct sctp_sack_info *params,
2822                                       unsigned int optlen)
2823{
2824        if (optlen == sizeof(struct sctp_assoc_value)) {
2825                struct sctp_assoc_value *v = (struct sctp_assoc_value *)params;
2826                struct sctp_sack_info p;
2827
2828                pr_warn_ratelimited(DEPRECATED
2829                                    "%s (pid %d) "
2830                                    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2831                                    "Use struct sctp_sack_info instead\n",
2832                                    current->comm, task_pid_nr(current));
2833
2834                p.sack_assoc_id = v->assoc_id;
2835                p.sack_delay = v->assoc_value;
2836                p.sack_freq = v->assoc_value ? 0 : 1;
2837                return __sctp_setsockopt_delayed_ack(sk, &p);
2838        }
2839
2840        if (optlen != sizeof(struct sctp_sack_info))
2841                return -EINVAL;
2842        if (params->sack_delay == 0 && params->sack_freq == 0)
2843                return 0;
2844        return __sctp_setsockopt_delayed_ack(sk, params);
2845}
2846
2847/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
2848 *
2849 * Applications can specify protocol parameters for the default association
2850 * initialization.  The option name argument to setsockopt() and getsockopt()
2851 * is SCTP_INITMSG.
2852 *
2853 * Setting initialization parameters is effective only on an unconnected
2854 * socket (for UDP-style sockets only future associations are effected
2855 * by the change).  With TCP-style sockets, this option is inherited by
2856 * sockets derived from a listener socket.
2857 */
2858static int sctp_setsockopt_initmsg(struct sock *sk, struct sctp_initmsg *sinit,
2859                                   unsigned int optlen)
2860{
2861        struct sctp_sock *sp = sctp_sk(sk);
2862
2863        if (optlen != sizeof(struct sctp_initmsg))
2864                return -EINVAL;
2865
2866        if (sinit->sinit_num_ostreams)
2867                sp->initmsg.sinit_num_ostreams = sinit->sinit_num_ostreams;
2868        if (sinit->sinit_max_instreams)
2869                sp->initmsg.sinit_max_instreams = sinit->sinit_max_instreams;
2870        if (sinit->sinit_max_attempts)
2871                sp->initmsg.sinit_max_attempts = sinit->sinit_max_attempts;
2872        if (sinit->sinit_max_init_timeo)
2873                sp->initmsg.sinit_max_init_timeo = sinit->sinit_max_init_timeo;
2874
2875        return 0;
2876}
2877
2878/*
2879 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
2880 *
2881 *   Applications that wish to use the sendto() system call may wish to
2882 *   specify a default set of parameters that would normally be supplied
2883 *   through the inclusion of ancillary data.  This socket option allows
2884 *   such an application to set the default sctp_sndrcvinfo structure.
2885 *   The application that wishes to use this socket option simply passes
2886 *   in to this call the sctp_sndrcvinfo structure defined in Section
2887 *   5.2.2) The input parameters accepted by this call include
2888 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
2889 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
2890 *   to this call if the caller is using the UDP model.
2891 */
2892static int sctp_setsockopt_default_send_param(struct sock *sk,
2893                                              struct sctp_sndrcvinfo *info,
2894                                              unsigned int optlen)
2895{
2896        struct sctp_sock *sp = sctp_sk(sk);
2897        struct sctp_association *asoc;
2898
2899        if (optlen != sizeof(*info))
2900                return -EINVAL;
2901        if (info->sinfo_flags &
2902            ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2903              SCTP_ABORT | SCTP_EOF))
2904                return -EINVAL;
2905
2906        asoc = sctp_id2assoc(sk, info->sinfo_assoc_id);
2907        if (!asoc && info->sinfo_assoc_id > SCTP_ALL_ASSOC &&
2908            sctp_style(sk, UDP))
2909                return -EINVAL;
2910
2911        if (asoc) {
2912                asoc->default_stream = info->sinfo_stream;
2913                asoc->default_flags = info->sinfo_flags;
2914                asoc->default_ppid = info->sinfo_ppid;
2915                asoc->default_context = info->sinfo_context;
2916                asoc->default_timetolive = info->sinfo_timetolive;
2917
2918                return 0;
2919        }
2920
2921        if (sctp_style(sk, TCP))
2922                info->sinfo_assoc_id = SCTP_FUTURE_ASSOC;
2923
2924        if (info->sinfo_assoc_id == SCTP_FUTURE_ASSOC ||
2925            info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2926                sp->default_stream = info->sinfo_stream;
2927                sp->default_flags = info->sinfo_flags;
2928                sp->default_ppid = info->sinfo_ppid;
2929                sp->default_context = info->sinfo_context;
2930                sp->default_timetolive = info->sinfo_timetolive;
2931        }
2932
2933        if (info->sinfo_assoc_id == SCTP_CURRENT_ASSOC ||
2934            info->sinfo_assoc_id == SCTP_ALL_ASSOC) {
2935                list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2936                        asoc->default_stream = info->sinfo_stream;
2937                        asoc->default_flags = info->sinfo_flags;
2938                        asoc->default_ppid = info->sinfo_ppid;
2939                        asoc->default_context = info->sinfo_context;
2940                        asoc->default_timetolive = info->sinfo_timetolive;
2941                }
2942        }
2943
2944        return 0;
2945}
2946
2947/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
2948 * (SCTP_DEFAULT_SNDINFO)
2949 */
2950static int sctp_setsockopt_default_sndinfo(struct sock *sk,
2951                                           struct sctp_sndinfo *info,
2952                                           unsigned int optlen)
2953{
2954        struct sctp_sock *sp = sctp_sk(sk);
2955        struct sctp_association *asoc;
2956
2957        if (optlen != sizeof(*info))
2958                return -EINVAL;
2959        if (info->snd_flags &
2960            ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
2961              SCTP_ABORT | SCTP_EOF))
2962                return -EINVAL;
2963
2964        asoc = sctp_id2assoc(sk, info->snd_assoc_id);
2965        if (!asoc && info->snd_assoc_id > SCTP_ALL_ASSOC &&
2966            sctp_style(sk, UDP))
2967                return -EINVAL;
2968
2969        if (asoc) {
2970                asoc->default_stream = info->snd_sid;
2971                asoc->default_flags = info->snd_flags;
2972                asoc->default_ppid = info->snd_ppid;
2973                asoc->default_context = info->snd_context;
2974
2975                return 0;
2976        }
2977
2978        if (sctp_style(sk, TCP))
2979                info->snd_assoc_id = SCTP_FUTURE_ASSOC;
2980
2981        if (info->snd_assoc_id == SCTP_FUTURE_ASSOC ||
2982            info->snd_assoc_id == SCTP_ALL_ASSOC) {
2983                sp->default_stream = info->snd_sid;
2984                sp->default_flags = info->snd_flags;
2985                sp->default_ppid = info->snd_ppid;
2986                sp->default_context = info->snd_context;
2987        }
2988
2989        if (info->snd_assoc_id == SCTP_CURRENT_ASSOC ||
2990            info->snd_assoc_id == SCTP_ALL_ASSOC) {
2991                list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
2992                        asoc->default_stream = info->snd_sid;
2993                        asoc->default_flags = info->snd_flags;
2994                        asoc->default_ppid = info->snd_ppid;
2995                        asoc->default_context = info->snd_context;
2996                }
2997        }
2998
2999        return 0;
3000}
3001
3002/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
3003 *
3004 * Requests that the local SCTP stack use the enclosed peer address as
3005 * the association primary.  The enclosed address must be one of the
3006 * association peer's addresses.
3007 */
3008static int sctp_setsockopt_primary_addr(struct sock *sk, struct sctp_prim *prim,
3009                                        unsigned int optlen)
3010{
3011        struct sctp_transport *trans;
3012        struct sctp_af *af;
3013        int err;
3014
3015        if (optlen != sizeof(struct sctp_prim))
3016                return -EINVAL;
3017
3018        /* Allow security module to validate address but need address len. */
3019        af = sctp_get_af_specific(prim->ssp_addr.ss_family);
3020        if (!af)
3021                return -EINVAL;
3022
3023        err = security_sctp_bind_connect(sk, SCTP_PRIMARY_ADDR,
3024                                         (struct sockaddr *)&prim->ssp_addr,
3025                                         af->sockaddr_len);
3026        if (err)
3027                return err;
3028
3029        trans = sctp_addr_id2transport(sk, &prim->ssp_addr, prim->ssp_assoc_id);
3030        if (!trans)
3031                return -EINVAL;
3032
3033        sctp_assoc_set_primary(trans->asoc, trans);
3034
3035        return 0;
3036}
3037
3038/*
3039 * 7.1.5 SCTP_NODELAY
3040 *
3041 * Turn on/off any Nagle-like algorithm.  This means that packets are
3042 * generally sent as soon as possible and no unnecessary delays are
3043 * introduced, at the cost of more packets in the network.  Expects an
3044 *  integer boolean flag.
3045 */
3046static int sctp_setsockopt_nodelay(struct sock *sk, int *val,
3047                                   unsigned int optlen)
3048{
3049        if (optlen < sizeof(int))
3050                return -EINVAL;
3051        sctp_sk(sk)->nodelay = (*val == 0) ? 0 : 1;
3052        return 0;
3053}
3054
3055/*
3056 *
3057 * 7.1.1 SCTP_RTOINFO
3058 *
3059 * The protocol parameters used to initialize and bound retransmission
3060 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
3061 * and modify these parameters.
3062 * All parameters are time values, in milliseconds.  A value of 0, when
3063 * modifying the parameters, indicates that the current value should not
3064 * be changed.
3065 *
3066 */
3067static int sctp_setsockopt_rtoinfo(struct sock *sk,
3068                                   struct sctp_rtoinfo *rtoinfo,
3069                                   unsigned int optlen)
3070{
3071        struct sctp_association *asoc;
3072        unsigned long rto_min, rto_max;
3073        struct sctp_sock *sp = sctp_sk(sk);
3074
3075        if (optlen != sizeof (struct sctp_rtoinfo))
3076                return -EINVAL;
3077
3078        asoc = sctp_id2assoc(sk, rtoinfo->srto_assoc_id);
3079
3080        /* Set the values to the specific association */
3081        if (!asoc && rtoinfo->srto_assoc_id != SCTP_FUTURE_ASSOC &&
3082            sctp_style(sk, UDP))
3083                return -EINVAL;
3084
3085        rto_max = rtoinfo->srto_max;
3086        rto_min = rtoinfo->srto_min;
3087
3088        if (rto_max)
3089                rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
3090        else
3091                rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;
3092
3093        if (rto_min)
3094                rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
3095        else
3096                rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;
3097
3098        if (rto_min > rto_max)
3099                return -EINVAL;
3100
3101        if (asoc) {
3102                if (rtoinfo->srto_initial != 0)
3103                        asoc->rto_initial =
3104                                msecs_to_jiffies(rtoinfo->srto_initial);
3105                asoc->rto_max = rto_max;
3106                asoc->rto_min = rto_min;
3107        } else {
3108                /* If there is no association or the association-id = 0
3109                 * set the values to the endpoint.
3110                 */
3111                if (rtoinfo->srto_initial != 0)
3112                        sp->rtoinfo.srto_initial = rtoinfo->srto_initial;
3113                sp->rtoinfo.srto_max = rto_max;
3114                sp->rtoinfo.srto_min = rto_min;
3115        }
3116
3117        return 0;
3118}
3119
3120/*
3121 *
3122 * 7.1.2 SCTP_ASSOCINFO
3123 *
3124 * This option is used to tune the maximum retransmission attempts
3125 * of the association.
3126 * Returns an error if the new association retransmission value is
3127 * greater than the sum of the retransmission value  of the peer.
3128 * See [SCTP] for more information.
3129 *
3130 */
3131static int sctp_setsockopt_associnfo(struct sock *sk,
3132                                     struct sctp_assocparams *assocparams,
3133                                     unsigned int optlen)
3134{
3135
3136        struct sctp_association *asoc;
3137
3138        if (optlen != sizeof(struct sctp_assocparams))
3139                return -EINVAL;
3140
3141        asoc = sctp_id2assoc(sk, assocparams->sasoc_assoc_id);
3142
3143        if (!asoc && assocparams->sasoc_assoc_id != SCTP_FUTURE_ASSOC &&
3144            sctp_style(sk, UDP))
3145                return -EINVAL;
3146
3147        /* Set the values to the specific association */
3148        if (asoc) {
3149                if (assocparams->sasoc_asocmaxrxt != 0) {
3150                        __u32 path_sum = 0;
3151                        int   paths = 0;
3152                        struct sctp_transport *peer_addr;
3153
3154                        list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
3155                                        transports) {
3156                                path_sum += peer_addr->pathmaxrxt;
3157                                paths++;
3158                        }
3159
3160                        /* Only validate asocmaxrxt if we have more than
3161                         * one path/transport.  We do this because path
3162                         * retransmissions are only counted when we have more
3163                         * then one path.
3164                         */
3165                        if (paths > 1 &&
3166                            assocparams->sasoc_asocmaxrxt > path_sum)
3167                                return -EINVAL;
3168
3169                        asoc->max_retrans = assocparams->sasoc_asocmaxrxt;
3170                }
3171
3172                if (assocparams->sasoc_cookie_life != 0)
3173                        asoc->cookie_life =
3174                                ms_to_ktime(assocparams->sasoc_cookie_life);
3175        } else {
3176                /* Set the values to the endpoint */
3177                struct sctp_sock *sp = sctp_sk(sk);
3178
3179                if (assocparams->sasoc_asocmaxrxt != 0)
3180                        sp->assocparams.sasoc_asocmaxrxt =
3181                                                assocparams->sasoc_asocmaxrxt;
3182                if (assocparams->sasoc_cookie_life != 0)
3183                        sp->assocparams.sasoc_cookie_life =
3184                                                assocparams->sasoc_cookie_life;
3185        }
3186        return 0;
3187}
3188
3189/*
3190 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
3191 *
3192 * This socket option is a boolean flag which turns on or off mapped V4
3193 * addresses.  If this option is turned on and the socket is type
3194 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
3195 * If this option is turned off, then no mapping will be done of V4
3196 * addresses and a user will receive both PF_INET6 and PF_INET type
3197 * addresses on the socket.
3198 */
3199static int sctp_setsockopt_mappedv4(struct sock *sk, int *val,
3200                                    unsigned int optlen)
3201{
3202        struct sctp_sock *sp = sctp_sk(sk);
3203
3204        if (optlen < sizeof(int))
3205                return -EINVAL;
3206        if (*val)
3207                sp->v4mapped = 1;
3208        else
3209                sp->v4mapped = 0;
3210
3211        return 0;
3212}
3213
3214/*
3215 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
3216 * This option will get or set the maximum size to put in any outgoing
3217 * SCTP DATA chunk.  If a message is larger than this size it will be
3218 * fragmented by SCTP into the specified size.  Note that the underlying
3219 * SCTP implementation may fragment into smaller sized chunks when the
3220 * PMTU of the underlying association is smaller than the value set by
3221 * the user.  The default value for this option is '0' which indicates
3222 * the user is NOT limiting fragmentation and only the PMTU will effect
3223 * SCTP's choice of DATA chunk size.  Note also that values set larger
3224 * than the maximum size of an IP datagram will effectively let SCTP
3225 * control fragmentation (i.e. the same as setting this option to 0).
3226 *
3227 * The following structure is used to access and modify this parameter:
3228 *
3229 * struct sctp_assoc_value {
3230 *   sctp_assoc_t assoc_id;
3231 *   uint32_t assoc_value;
3232 * };
3233 *
3234 * assoc_id:  This parameter is ignored for one-to-one style sockets.
3235 *    For one-to-many style sockets this parameter indicates which
3236 *    association the user is performing an action upon.  Note that if
3237 *    this field's value is zero then the endpoints default value is
3238 *    changed (effecting future associations only).
3239 * assoc_value:  This parameter specifies the maximum size in bytes.
3240 */
3241static int sctp_setsockopt_maxseg(struct sock *sk,
3242                                  struct sctp_assoc_value *params,
3243                                  unsigned int optlen)
3244{
3245        struct sctp_sock *sp = sctp_sk(sk);
3246        struct sctp_association *asoc;
3247        sctp_assoc_t assoc_id;
3248        int val;
3249
3250        if (optlen == sizeof(int)) {
3251                pr_warn_ratelimited(DEPRECATED
3252                                    "%s (pid %d) "
3253                                    "Use of int in maxseg socket option.\n"
3254                                    "Use struct sctp_assoc_value instead\n",
3255                                    current->comm, task_pid_nr(current));
3256                assoc_id = SCTP_FUTURE_ASSOC;
3257                val = *(int *)params;
3258        } else if (optlen == sizeof(struct sctp_assoc_value)) {
3259                assoc_id = params->assoc_id;
3260                val = params->assoc_value;
3261        } else {
3262                return -EINVAL;
3263        }
3264
3265        asoc = sctp_id2assoc(sk, assoc_id);
3266        if (!asoc && assoc_id != SCTP_FUTURE_ASSOC &&
3267            sctp_style(sk, UDP))
3268                return -EINVAL;
3269
3270        if (val) {
3271                int min_len, max_len;
3272                __u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
3273                                 sizeof(struct sctp_data_chunk);
3274
3275                min_len = sctp_min_frag_point(sp, datasize);
3276                max_len = SCTP_MAX_CHUNK_LEN - datasize;
3277
3278                if (val < min_len || val > max_len)
3279                        return -EINVAL;
3280        }
3281
3282        if (asoc) {
3283                asoc->user_frag = val;
3284                sctp_assoc_update_frag_point(asoc);
3285        } else {
3286                sp->user_frag = val;
3287        }
3288
3289        return 0;
3290}
3291
3292
3293/*
3294 *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
3295 *
3296 *   Requests that the peer mark the enclosed address as the association
3297 *   primary. The enclosed address must be one of the association's
3298 *   locally bound addresses. The following structure is used to make a
3299 *   set primary request:
3300 */
3301static int sctp_setsockopt_peer_primary_addr(struct sock *sk,
3302                                             struct sctp_setpeerprim *prim,
3303                                             unsigned int optlen)
3304{
3305        struct sctp_sock        *sp;
3306        struct sctp_association *asoc = NULL;
3307        struct sctp_chunk       *chunk;
3308        struct sctp_af          *af;
3309        int                     err;
3310
3311        sp = sctp_sk(sk);
3312
3313        if (!sp->ep->asconf_enable)
3314                return -EPERM;
3315
3316        if (optlen != sizeof(struct sctp_setpeerprim))
3317                return -EINVAL;
3318
3319        asoc = sctp_id2assoc(sk, prim->sspp_assoc_id);
3320        if (!asoc)
3321                return -EINVAL;
3322
3323        if (!asoc->peer.asconf_capable)
3324                return -EPERM;
3325
3326        if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
3327                return -EPERM;
3328
3329        if (!sctp_state(asoc, ESTABLISHED))
3330                return -ENOTCONN;
3331
3332        af = sctp_get_af_specific(prim->sspp_addr.ss_family);
3333        if (!af)
3334                return -EINVAL;
3335
3336        if (!af->addr_valid((union sctp_addr *)&prim->sspp_addr, sp, NULL))
3337                return -EADDRNOTAVAIL;
3338
3339        if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim->sspp_addr))
3340                return -EADDRNOTAVAIL;
3341
3342        /* Allow security module to validate address. */
3343        err = security_sctp_bind_connect(sk, SCTP_SET_PEER_PRIMARY_ADDR,
3344                                         (struct sockaddr *)&prim->sspp_addr,
3345                                         af->sockaddr_len);
3346        if (err)
3347                return err;
3348
3349        /* Create an ASCONF chunk with SET_PRIMARY parameter    */
3350        chunk = sctp_make_asconf_set_prim(asoc,
3351                                          (union sctp_addr *)&prim->sspp_addr);
3352        if (!chunk)
3353                return -ENOMEM;
3354
3355        err = sctp_send_asconf(asoc, chunk);
3356
3357        pr_debug("%s: we set peer primary addr primitively\n", __func__);
3358
3359        return err;
3360}
3361
3362static int sctp_setsockopt_adaptation_layer(struct sock *sk,
3363                                            struct sctp_setadaptation *adapt,
3364                                            unsigned int optlen)
3365{
3366        if (optlen != sizeof(struct sctp_setadaptation))
3367                return -EINVAL;
3368
3369        sctp_sk(sk)->adaptation_ind = adapt->ssb_adaptation_ind;
3370
3371        return 0;
3372}
3373
3374/*
3375 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
3376 *
3377 * The context field in the sctp_sndrcvinfo structure is normally only
3378 * used when a failed message is retrieved holding the value that was
3379 * sent down on the actual send call.  This option allows the setting of
3380 * a default context on an association basis that will be received on
3381 * reading messages from the peer.  This is especially helpful in the
3382 * one-2-many model for an application to keep some reference to an
3383 * internal state machine that is processing messages on the
3384 * association.  Note that the setting of this value only effects
3385 * received messages from the peer and does not effect the value that is
3386 * saved with outbound messages.
3387 */
3388static int sctp_setsockopt_context(struct sock *sk,
3389                                   struct sctp_assoc_value *params,
3390                                   unsigned int optlen)
3391{
3392        struct sctp_sock *sp = sctp_sk(sk);
3393        struct sctp_association *asoc;
3394
3395        if (optlen != sizeof(struct sctp_assoc_value))
3396                return -EINVAL;
3397
3398        asoc = sctp_id2assoc(sk, params->assoc_id);
3399        if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
3400            sctp_style(sk, UDP))
3401                return -EINVAL;
3402
3403        if (asoc) {
3404                asoc->default_rcv_context = params->assoc_value;
3405
3406                return 0;
3407        }
3408
3409        if (sctp_style(sk, TCP))
3410                params->assoc_id = SCTP_FUTURE_ASSOC;
3411
3412        if (params->assoc_id == SCTP_FUTURE_ASSOC ||
3413            params->assoc_id == SCTP_ALL_ASSOC)
3414                sp->default_rcv_context = params->assoc_value;
3415
3416        if (params->assoc_id == SCTP_CURRENT_ASSOC ||
3417            params->assoc_id == SCTP_ALL_ASSOC)
3418                list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3419                        asoc->default_rcv_context = params->assoc_value;
3420
3421        return 0;
3422}
3423
3424/*
3425 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
3426 *
3427 * This options will at a minimum specify if the implementation is doing
3428 * fragmented interleave.  Fragmented interleave, for a one to many
3429 * socket, is when subsequent calls to receive a message may return
3430 * parts of messages from different associations.  Some implementations
3431 * may allow you to turn this value on or off.  If so, when turned off,
3432 * no fragment interleave will occur (which will cause a head of line
3433 * blocking amongst multiple associations sharing the same one to many
3434 * socket).  When this option is turned on, then each receive call may
3435 * come from a different association (thus the user must receive data
3436 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
3437 * association each receive belongs to.
3438 *
3439 * This option takes a boolean value.  A non-zero value indicates that
3440 * fragmented interleave is on.  A value of zero indicates that
3441 * fragmented interleave is off.
3442 *
3443 * Note that it is important that an implementation that allows this
3444 * option to be turned on, have it off by default.  Otherwise an unaware
3445 * application using the one to many model may become confused and act
3446 * incorrectly.
3447 */
3448static int sctp_setsockopt_fragment_interleave(struct sock *sk, int *val,
3449                                               unsigned int optlen)
3450{
3451        if (optlen != sizeof(int))
3452                return -EINVAL;
3453
3454        sctp_sk(sk)->frag_interleave = !!*val;
3455
3456        if (!sctp_sk(sk)->frag_interleave)
3457                sctp_sk(sk)->ep->intl_enable = 0;
3458
3459        return 0;
3460}
3461
3462/*
3463 * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3464 *       (SCTP_PARTIAL_DELIVERY_POINT)
3465 *
3466 * This option will set or get the SCTP partial delivery point.  This
3467 * point is the size of a message where the partial delivery API will be
3468 * invoked to help free up rwnd space for the peer.  Setting this to a
3469 * lower value will cause partial deliveries to happen more often.  The
3470 * calls argument is an integer that sets or gets the partial delivery
3471 * point.  Note also that the call will fail if the user attempts to set
3472 * this value larger than the socket receive buffer size.
3473 *
3474 * Note that any single message having a length smaller than or equal to
3475 * the SCTP partial delivery point will be delivered in one single read
3476 * call as long as the user provided buffer is large enough to hold the
3477 * message.
3478 */
3479static int sctp_setsockopt_partial_delivery_point(struct sock *sk, u32 *val,
3480                                                  unsigned int optlen)
3481{
3482        if (optlen != sizeof(u32))
3483                return -EINVAL;
3484
3485        /* Note: We double the receive buffer from what the user sets
3486         * it to be, also initial rwnd is based on rcvbuf/2.
3487         */
3488        if (*val > (sk->sk_rcvbuf >> 1))
3489                return -EINVAL;
3490
3491        sctp_sk(sk)->pd_point = *val;
3492
3493        return 0; /* is this the right error code? */
3494}
3495
3496/*
3497 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
3498 *
3499 * This option will allow a user to change the maximum burst of packets
3500 * that can be emitted by this association.  Note that the default value
3501 * is 4, and some implementations may restrict this setting so that it
3502 * can only be lowered.
3503 *
3504 * NOTE: This text doesn't seem right.  Do this on a socket basis with
3505 * future associations inheriting the socket value.
3506 */
3507static int sctp_setsockopt_maxburst(struct sock *sk,
3508                                    struct sctp_assoc_value *params,
3509                                    unsigned int optlen)
3510{
3511        struct sctp_sock *sp = sctp_sk(sk);
3512        struct sctp_association *asoc;
3513        sctp_assoc_t assoc_id;
3514        u32 assoc_value;
3515
3516        if (optlen == sizeof(int)) {
3517                pr_warn_ratelimited(DEPRECATED
3518                                    "%s (pid %d) "
3519                                    "Use of int in max_burst socket option deprecated.\n"
3520                                    "Use struct sctp_assoc_value instead\n",
3521                                    current->comm, task_pid_nr(current));
3522                assoc_id = SCTP_FUTURE_ASSOC;
3523                assoc_value = *((int *)params);
3524        } else if (optlen == sizeof(struct sctp_assoc_value)) {
3525                assoc_id = params->assoc_id;
3526                assoc_value = params->assoc_value;
3527        } else
3528                return -EINVAL;
3529
3530        asoc = sctp_id2assoc(sk, assoc_id);
3531        if (!asoc && assoc_id > SCTP_ALL_ASSOC && sctp_style(sk, UDP))
3532                return -EINVAL;
3533
3534        if (asoc) {
3535                asoc->max_burst = assoc_value;
3536
3537                return 0;
3538        }
3539
3540        if (sctp_style(sk, TCP))
3541                assoc_id = SCTP_FUTURE_ASSOC;
3542
3543        if (assoc_id == SCTP_FUTURE_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3544                sp->max_burst = assoc_value;
3545
3546        if (assoc_id == SCTP_CURRENT_ASSOC || assoc_id == SCTP_ALL_ASSOC)
3547                list_for_each_entry(asoc, &sp->ep->asocs, asocs)
3548                        asoc->max_burst = assoc_value;
3549
3550        return 0;
3551}
3552
3553/*
3554 * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
3555 *
3556 * This set option adds a chunk type that the user is requesting to be
3557 * received only in an authenticated way.  Changes to the list of chunks
3558 * will only effect future associations on the socket.
3559 */
3560static int sctp_setsockopt_auth_chunk(struct sock *sk,
3561                                      struct sctp_authchunk *val,
3562                                      unsigned int optlen)
3563{
3564        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3565
3566        if (!ep->auth_enable)
3567                return -EACCES;
3568
3569        if (optlen != sizeof(struct sctp_authchunk))
3570                return -EINVAL;
3571
3572        switch (val->sauth_chunk) {
3573        case SCTP_CID_INIT:
3574        case SCTP_CID_INIT_ACK:
3575        case SCTP_CID_SHUTDOWN_COMPLETE:
3576        case SCTP_CID_AUTH:
3577                return -EINVAL;
3578        }
3579
3580        /* add this chunk id to the endpoint */
3581        return sctp_auth_ep_add_chunkid(ep, val->sauth_chunk);
3582}
3583
3584/*
3585 * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
3586 *
3587 * This option gets or sets the list of HMAC algorithms that the local
3588 * endpoint requires the peer to use.
3589 */
3590static int sctp_setsockopt_hmac_ident(struct sock *sk,
3591                                      struct sctp_hmacalgo *hmacs,
3592                                      unsigned int optlen)
3593{
3594        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3595        u32 idents;
3596
3597        if (!ep->auth_enable)
3598                return -EACCES;
3599
3600        if (optlen < sizeof(struct sctp_hmacalgo))
3601                return -EINVAL;
3602        optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
3603                                             SCTP_AUTH_NUM_HMACS * sizeof(u16));
3604
3605        idents = hmacs->shmac_num_idents;
3606        if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
3607            (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo)))
3608                return -EINVAL;
3609
3610        return sctp_auth_ep_set_hmacs(ep, hmacs);
3611}
3612
3613/*
3614 * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
3615 *
3616 * This option will set a shared secret key which is used to build an
3617 * association shared key.
3618 */
3619static int sctp_setsockopt_auth_key(struct sock *sk,
3620                                    struct sctp_authkey *authkey,
3621                                    unsigned int optlen)
3622{
3623        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3624        struct sctp_association *asoc;
3625        int ret = -EINVAL;
3626
3627        if (optlen <= sizeof(struct sctp_authkey))
3628                return -EINVAL;
3629        /* authkey->sca_keylength is u16, so optlen can't be bigger than
3630         * this.
3631         */
3632        optlen = min_t(unsigned int, optlen, USHRT_MAX + sizeof(*authkey));
3633
3634        if (authkey->sca_keylength > optlen - sizeof(*authkey))
3635                goto out;
3636
3637        asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
3638        if (!asoc && authkey->sca_assoc_id > SCTP_ALL_ASSOC &&
3639            sctp_style(sk, UDP))
3640                goto out;
3641
3642        if (asoc) {
3643                ret = sctp_auth_set_key(ep, asoc, authkey);
3644                goto out;
3645        }
3646
3647        if (sctp_style(sk, TCP))
3648                authkey->sca_assoc_id = SCTP_FUTURE_ASSOC;
3649
3650        if (authkey->sca_assoc_id == SCTP_FUTURE_ASSOC ||
3651            authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3652                ret = sctp_auth_set_key(ep, asoc, authkey);
3653                if (ret)
3654                        goto out;
3655        }
3656
3657        ret = 0;
3658
3659        if (authkey->sca_assoc_id == SCTP_CURRENT_ASSOC ||
3660            authkey->sca_assoc_id == SCTP_ALL_ASSOC) {
3661                list_for_each_entry(asoc, &ep->asocs, asocs) {
3662                        int res = sctp_auth_set_key(ep, asoc, authkey);
3663
3664                        if (res && !ret)
3665                                ret = res;
3666                }
3667        }
3668
3669out:
3670        memzero_explicit(authkey, optlen);
3671        return ret;
3672}
3673
3674/*
3675 * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
3676 *
3677 * This option will get or set the active shared key to be used to build
3678 * the association shared key.
3679 */
3680static int sctp_setsockopt_active_key(struct sock *sk,
3681                                      struct sctp_authkeyid *val,
3682                                      unsigned int optlen)
3683{
3684        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3685        struct sctp_association *asoc;
3686        int ret = 0;
3687
3688        if (optlen != sizeof(struct sctp_authkeyid))
3689                return -EINVAL;
3690
3691        asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3692        if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3693            sctp_style(sk, UDP))
3694                return -EINVAL;
3695
3696        if (asoc)
3697                return sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3698
3699        if (sctp_style(sk, TCP))
3700                val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3701
3702        if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3703            val->scact_assoc_id == SCTP_ALL_ASSOC) {
3704                ret = sctp_auth_set_active_key(ep, asoc, val->scact_keynumber);
3705                if (ret)
3706                        return ret;
3707        }
3708
3709        if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3710            val->scact_assoc_id == SCTP_ALL_ASSOC) {
3711                list_for_each_entry(asoc, &ep->asocs, asocs) {
3712                        int res = sctp_auth_set_active_key(ep, asoc,
3713                                                           val->scact_keynumber);
3714
3715                        if (res && !ret)
3716                                ret = res;
3717                }
3718        }
3719
3720        return ret;
3721}
3722
3723/*
3724 * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
3725 *
3726 * This set option will delete a shared secret key from use.
3727 */
3728static int sctp_setsockopt_del_key(struct sock *sk,
3729                                   struct sctp_authkeyid *val,
3730                                   unsigned int optlen)
3731{
3732        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3733        struct sctp_association *asoc;
3734        int ret = 0;
3735
3736        if (optlen != sizeof(struct sctp_authkeyid))
3737                return -EINVAL;
3738
3739        asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3740        if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3741            sctp_style(sk, UDP))
3742                return -EINVAL;
3743
3744        if (asoc)
3745                return sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3746
3747        if (sctp_style(sk, TCP))
3748                val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3749
3750        if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3751            val->scact_assoc_id == SCTP_ALL_ASSOC) {
3752                ret = sctp_auth_del_key_id(ep, asoc, val->scact_keynumber);
3753                if (ret)
3754                        return ret;
3755        }
3756
3757        if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3758            val->scact_assoc_id == SCTP_ALL_ASSOC) {
3759                list_for_each_entry(asoc, &ep->asocs, asocs) {
3760                        int res = sctp_auth_del_key_id(ep, asoc,
3761                                                       val->scact_keynumber);
3762
3763                        if (res && !ret)
3764                                ret = res;
3765                }
3766        }
3767
3768        return ret;
3769}
3770
3771/*
3772 * 8.3.4  Deactivate a Shared Key (SCTP_AUTH_DEACTIVATE_KEY)
3773 *
3774 * This set option will deactivate a shared secret key.
3775 */
3776static int sctp_setsockopt_deactivate_key(struct sock *sk,
3777                                          struct sctp_authkeyid *val,
3778                                          unsigned int optlen)
3779{
3780        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3781        struct sctp_association *asoc;
3782        int ret = 0;
3783
3784        if (optlen != sizeof(struct sctp_authkeyid))
3785                return -EINVAL;
3786
3787        asoc = sctp_id2assoc(sk, val->scact_assoc_id);
3788        if (!asoc && val->scact_assoc_id > SCTP_ALL_ASSOC &&
3789            sctp_style(sk, UDP))
3790                return -EINVAL;
3791
3792        if (asoc)
3793                return sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3794
3795        if (sctp_style(sk, TCP))
3796                val->scact_assoc_id = SCTP_FUTURE_ASSOC;
3797
3798        if (val->scact_assoc_id == SCTP_FUTURE_ASSOC ||
3799            val->scact_assoc_id == SCTP_ALL_ASSOC) {
3800                ret = sctp_auth_deact_key_id(ep, asoc, val->scact_keynumber);
3801                if (ret)
3802                        return ret;
3803        }
3804
3805        if (val->scact_assoc_id == SCTP_CURRENT_ASSOC ||
3806            val->scact_assoc_id == SCTP_ALL_ASSOC) {
3807                list_for_each_entry(asoc, &ep->asocs, asocs) {
3808                        int res = sctp_auth_deact_key_id(ep, asoc,
3809                                                         val->scact_keynumber);
3810
3811                        if (res && !ret)
3812                                ret = res;
3813                }
3814        }
3815
3816        return ret;
3817}
3818
3819/*
3820 * 8.1.23 SCTP_AUTO_ASCONF
3821 *
3822 * This option will enable or disable the use of the automatic generation of
3823 * ASCONF chunks to add and delete addresses to an existing association.  Note
3824 * that this option has two caveats namely: a) it only affects sockets that
3825 * are bound to all addresses available to the SCTP stack, and b) the system
3826 * administrator may have an overriding control that turns the ASCONF feature
3827 * off no matter what setting the socket option may have.
3828 * This option expects an integer boolean flag, where a non-zero value turns on
3829 * the option, and a zero value turns off the option.
3830 * Note. In this implementation, socket operation overrides default parameter
3831 * being set by sysctl as well as FreeBSD implementation
3832 */
3833static int sctp_setsockopt_auto_asconf(struct sock *sk, int *val,
3834                                        unsigned int optlen)
3835{
3836        struct sctp_sock *sp = sctp_sk(sk);
3837
3838        if (optlen < sizeof(int))
3839                return -EINVAL;
3840        if (!sctp_is_ep_boundall(sk) && *val)
3841                return -EINVAL;
3842        if ((*val && sp->do_auto_asconf) || (!*val && !sp->do_auto_asconf))
3843                return 0;
3844
3845        spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3846        if (*val == 0 && sp->do_auto_asconf) {
3847                list_del(&sp->auto_asconf_list);
3848                sp->do_auto_asconf = 0;
3849        } else if (*val && !sp->do_auto_asconf) {
3850                list_add_tail(&sp->auto_asconf_list,
3851                    &sock_net(sk)->sctp.auto_asconf_splist);
3852                sp->do_auto_asconf = 1;
3853        }
3854        spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3855        return 0;
3856}
3857
3858/*
3859 * SCTP_PEER_ADDR_THLDS
3860 *
3861 * This option allows us to alter the partially failed threshold for one or all
3862 * transports in an association.  See Section 6.1 of:
3863 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
3864 */
3865static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
3866                                            struct sctp_paddrthlds_v2 *val,
3867                                            unsigned int optlen, bool v2)
3868{
3869        struct sctp_transport *trans;
3870        struct sctp_association *asoc;
3871        int len;
3872
3873        len = v2 ? sizeof(*val) : sizeof(struct sctp_paddrthlds);
3874        if (optlen < len)
3875                return -EINVAL;
3876
3877        if (v2 && val->spt_pathpfthld > val->spt_pathcpthld)
3878                return -EINVAL;
3879
3880        if (!sctp_is_any(sk, (const union sctp_addr *)&val->spt_address)) {
3881                trans = sctp_addr_id2transport(sk, &val->spt_address,
3882                                               val->spt_assoc_id);
3883                if (!trans)
3884                        return -ENOENT;
3885
3886                if (val->spt_pathmaxrxt)
3887                        trans->pathmaxrxt = val->spt_pathmaxrxt;
3888                if (v2)
3889                        trans->ps_retrans = val->spt_pathcpthld;
3890                trans->pf_retrans = val->spt_pathpfthld;
3891
3892                return 0;
3893        }
3894
3895        asoc = sctp_id2assoc(sk, val->spt_assoc_id);
3896        if (!asoc && val->spt_assoc_id != SCTP_FUTURE_ASSOC &&
3897            sctp_style(sk, UDP))
3898                return -EINVAL;
3899
3900        if (asoc) {
3901                list_for_each_entry(trans, &asoc->peer.transport_addr_list,
3902                                    transports) {
3903                        if (val->spt_pathmaxrxt)
3904                                trans->pathmaxrxt = val->spt_pathmaxrxt;
3905                        if (v2)
3906                                trans->ps_retrans = val->spt_pathcpthld;
3907                        trans->pf_retrans = val->spt_pathpfthld;
3908                }
3909
3910                if (val->spt_pathmaxrxt)
3911                        asoc->pathmaxrxt = val->spt_pathmaxrxt;
3912                if (v2)
3913                        asoc->ps_retrans = val->spt_pathcpthld;
3914                asoc->pf_retrans = val->spt_pathpfthld;
3915        } else {
3916                struct sctp_sock *sp = sctp_sk(sk);
3917
3918                if (val->spt_pathmaxrxt)
3919                        sp->pathmaxrxt = val->spt_pathmaxrxt;
3920                if (v2)
3921                        sp->ps_retrans = val->spt_pathcpthld;
3922                sp->pf_retrans = val->spt_pathpfthld;
3923        }
3924
3925        return 0;
3926}
3927
3928static int sctp_setsockopt_recvrcvinfo(struct sock *sk, int *val,
3929                                       unsigned int optlen)
3930{
3931        if (optlen < sizeof(int))
3932                return -EINVAL;
3933
3934        sctp_sk(sk)->recvrcvinfo = (*val == 0) ? 0 : 1;
3935
3936        return 0;
3937}
3938
3939static int sctp_setsockopt_recvnxtinfo(struct sock *sk, int *val,
3940                                       unsigned int optlen)
3941{
3942        if (optlen < sizeof(int))
3943                return -EINVAL;
3944
3945        sctp_sk(sk)->recvnxtinfo = (*val == 0) ? 0 : 1;
3946
3947        return 0;
3948}
3949
3950static int sctp_setsockopt_pr_supported(struct sock *sk,
3951                                        struct sctp_assoc_value *params,
3952                                        unsigned int optlen)
3953{
3954        struct sctp_association *asoc;
3955
3956        if (optlen != sizeof(*params))
3957                return -EINVAL;
3958
3959        asoc = sctp_id2assoc(sk, params->assoc_id);
3960        if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
3961            sctp_style(sk, UDP))
3962                return -EINVAL;
3963
3964        sctp_sk(sk)->ep->prsctp_enable = !!params->assoc_value;
3965
3966        return 0;
3967}
3968
3969static int sctp_setsockopt_default_prinfo(struct sock *sk,
3970                                          struct sctp_default_prinfo *info,
3971                                          unsigned int optlen)
3972{
3973        struct sctp_sock *sp = sctp_sk(sk);
3974        struct sctp_association *asoc;
3975        int retval = -EINVAL;
3976
3977        if (optlen != sizeof(*info))
3978                goto out;
3979
3980        if (info->pr_policy & ~SCTP_PR_SCTP_MASK)
3981                goto out;
3982
3983        if (info->pr_policy == SCTP_PR_SCTP_NONE)
3984                info->pr_value = 0;
3985
3986        asoc = sctp_id2assoc(sk, info->pr_assoc_id);
3987        if (!asoc && info->pr_assoc_id > SCTP_ALL_ASSOC &&
3988            sctp_style(sk, UDP))
3989                goto out;
3990
3991        retval = 0;
3992
3993        if (asoc) {
3994                SCTP_PR_SET_POLICY(asoc->default_flags, info->pr_policy);
3995                asoc->default_timetolive = info->pr_value;
3996                goto out;
3997        }
3998
3999        if (sctp_style(sk, TCP))
4000                info->pr_assoc_id = SCTP_FUTURE_ASSOC;
4001
4002        if (info->pr_assoc_id == SCTP_FUTURE_ASSOC ||
4003            info->pr_assoc_id == SCTP_ALL_ASSOC) {
4004                SCTP_PR_SET_POLICY(sp->default_flags, info->pr_policy);
4005                sp->default_timetolive = info->pr_value;
4006        }
4007
4008        if (info->pr_assoc_id == SCTP_CURRENT_ASSOC ||
4009            info->pr_assoc_id == SCTP_ALL_ASSOC) {
4010                list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4011                        SCTP_PR_SET_POLICY(asoc->default_flags,
4012                                           info->pr_policy);
4013                        asoc->default_timetolive = info->pr_value;
4014                }
4015        }
4016
4017out:
4018        return retval;
4019}
4020
4021static int sctp_setsockopt_reconfig_supported(struct sock *sk,
4022                                              struct sctp_assoc_value *params,
4023                                              unsigned int optlen)
4024{
4025        struct sctp_association *asoc;
4026        int retval = -EINVAL;
4027
4028        if (optlen != sizeof(*params))
4029                goto out;
4030
4031        asoc = sctp_id2assoc(sk, params->assoc_id);
4032        if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4033            sctp_style(sk, UDP))
4034                goto out;
4035
4036        sctp_sk(sk)->ep->reconf_enable = !!params->assoc_value;
4037
4038        retval = 0;
4039
4040out:
4041        return retval;
4042}
4043
4044static int sctp_setsockopt_enable_strreset(struct sock *sk,
4045                                           struct sctp_assoc_value *params,
4046                                           unsigned int optlen)
4047{
4048        struct sctp_endpoint *ep = sctp_sk(sk)->ep;
4049        struct sctp_association *asoc;
4050        int retval = -EINVAL;
4051
4052        if (optlen != sizeof(*params))
4053                goto out;
4054
4055        if (params->assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
4056                goto out;
4057
4058        asoc = sctp_id2assoc(sk, params->assoc_id);
4059        if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4060            sctp_style(sk, UDP))
4061                goto out;
4062
4063        retval = 0;
4064
4065        if (asoc) {
4066                asoc->strreset_enable = params->assoc_value;
4067                goto out;
4068        }
4069
4070        if (sctp_style(sk, TCP))
4071                params->assoc_id = SCTP_FUTURE_ASSOC;
4072
4073        if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4074            params->assoc_id == SCTP_ALL_ASSOC)
4075                ep->strreset_enable = params->assoc_value;
4076
4077        if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4078            params->assoc_id == SCTP_ALL_ASSOC)
4079                list_for_each_entry(asoc, &ep->asocs, asocs)
4080                        asoc->strreset_enable = params->assoc_value;
4081
4082out:
4083        return retval;
4084}
4085
4086static int sctp_setsockopt_reset_streams(struct sock *sk,
4087                                         struct sctp_reset_streams *params,
4088                                         unsigned int optlen)
4089{
4090        struct sctp_association *asoc;
4091
4092        if (optlen < sizeof(*params))
4093                return -EINVAL;
4094        /* srs_number_streams is u16, so optlen can't be bigger than this. */
4095        optlen = min_t(unsigned int, optlen, USHRT_MAX +
4096                                             sizeof(__u16) * sizeof(*params));
4097
4098        if (params->srs_number_streams * sizeof(__u16) >
4099            optlen - sizeof(*params))
4100                return -EINVAL;
4101
4102        asoc = sctp_id2assoc(sk, params->srs_assoc_id);
4103        if (!asoc)
4104                return -EINVAL;
4105
4106        return sctp_send_reset_streams(asoc, params);
4107}
4108
4109static int sctp_setsockopt_reset_assoc(struct sock *sk, sctp_assoc_t *associd,
4110                                       unsigned int optlen)
4111{
4112        struct sctp_association *asoc;
4113
4114        if (optlen != sizeof(*associd))
4115                return -EINVAL;
4116
4117        asoc = sctp_id2assoc(sk, *associd);
4118        if (!asoc)
4119                return -EINVAL;
4120
4121        return sctp_send_reset_assoc(asoc);
4122}
4123
4124static int sctp_setsockopt_add_streams(struct sock *sk,
4125                                       struct sctp_add_streams *params,
4126                                       unsigned int optlen)
4127{
4128        struct sctp_association *asoc;
4129
4130        if (optlen != sizeof(*params))
4131                return -EINVAL;
4132
4133        asoc = sctp_id2assoc(sk, params->sas_assoc_id);
4134        if (!asoc)
4135                return -EINVAL;
4136
4137        return sctp_send_add_streams(asoc, params);
4138}
4139
4140static int sctp_setsockopt_scheduler(struct sock *sk,
4141                                     struct sctp_assoc_value *params,
4142                                     unsigned int optlen)
4143{
4144        struct sctp_sock *sp = sctp_sk(sk);
4145        struct sctp_association *asoc;
4146        int retval = 0;
4147
4148        if (optlen < sizeof(*params))
4149                return -EINVAL;
4150
4151        if (params->assoc_value > SCTP_SS_MAX)
4152                return -EINVAL;
4153
4154        asoc = sctp_id2assoc(sk, params->assoc_id);
4155        if (!asoc && params->assoc_id > SCTP_ALL_ASSOC &&
4156            sctp_style(sk, UDP))
4157                return -EINVAL;
4158
4159        if (asoc)
4160                return sctp_sched_set_sched(asoc, params->assoc_value);
4161
4162        if (sctp_style(sk, TCP))
4163                params->assoc_id = SCTP_FUTURE_ASSOC;
4164
4165        if (params->assoc_id == SCTP_FUTURE_ASSOC ||
4166            params->assoc_id == SCTP_ALL_ASSOC)
4167                sp->default_ss = params->assoc_value;
4168
4169        if (params->assoc_id == SCTP_CURRENT_ASSOC ||
4170            params->assoc_id == SCTP_ALL_ASSOC) {
4171                list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4172                        int ret = sctp_sched_set_sched(asoc,
4173                                                       params->assoc_value);
4174
4175                        if (ret && !retval)
4176                                retval = ret;
4177                }
4178        }
4179
4180        return retval;
4181}
4182
4183static int sctp_setsockopt_scheduler_value(struct sock *sk,
4184                                           struct sctp_stream_value *params,
4185                                           unsigned int optlen)
4186{
4187        struct sctp_association *asoc;
4188        int retval = -EINVAL;
4189
4190        if (optlen < sizeof(*params))
4191                goto out;
4192
4193        asoc = sctp_id2assoc(sk, params->assoc_id);
4194        if (!asoc && params->assoc_id != SCTP_CURRENT_ASSOC &&
4195            sctp_style(sk, UDP))
4196                goto out;
4197
4198        if (asoc) {
4199                retval = sctp_sched_set_value(asoc, params->stream_id,
4200                                              params->stream_value, GFP_KERNEL);
4201                goto out;
4202        }
4203
4204        retval = 0;
4205
4206        list_for_each_entry(asoc, &sctp_sk(sk)->ep->asocs, asocs) {
4207                int ret = sctp_sched_set_value(asoc, params->stream_id,
4208                                               params->stream_value,
4209                                               GFP_KERNEL);
4210                if (ret && !retval) /* try to return the 1st error. */
4211                        retval = ret;
4212        }
4213
4214out:
4215        return retval;
4216}
4217
4218static int sctp_setsockopt_interleaving_supported(struct sock *sk,
4219                                                  struct sctp_assoc_value *p,
4220                                                  unsigned int optlen)
4221{
4222        struct sctp_sock *sp = sctp_sk(sk);
4223        struct sctp_association *asoc;
4224
4225        if (optlen < sizeof(*p))
4226                return -EINVAL;
4227
4228        asoc = sctp_id2assoc(sk, p->assoc_id);
4229        if (!asoc && p->assoc_id != SCTP_FUTURE_ASSOC && sctp_style(sk, UDP))
4230                return -EINVAL;
4231
4232        if (!sock_net(sk)->sctp.intl_enable || !sp->frag_interleave) {
4233                return -EPERM;
4234        }
4235
4236        sp->ep->intl_enable = !!p->assoc_value;
4237        return 0;
4238}
4239
4240static int sctp_setsockopt_reuse_port(struct sock *sk, int *val,
4241                                      unsigned int optlen)
4242{
4243        if (!sctp_style(sk, TCP))
4244                return -EOPNOTSUPP;
4245
4246        if (sctp_sk(sk)->ep->base.bind_addr.port)
4247                return -EFAULT;
4248
4249        if (optlen < sizeof(int))
4250                return -EINVAL;
4251
4252        sctp_sk(sk)->reuse = !!*val;
4253
4254        return 0;
4255}
4256
4257static int sctp_assoc_ulpevent_type_set(struct sctp_event *param,
4258                                        struct sctp_association *asoc)
4259{
4260        struct sctp_ulpevent *event;
4261
4262        sctp_ulpevent_type_set(&asoc->subscribe, param->se_type, param->se_on);
4263
4264        if (param->se_type == SCTP_SENDER_DRY_EVENT && param->se_on) {
4265                if (sctp_outq_is_empty(&asoc->outqueue)) {
4266                        event = sctp_ulpevent_make_sender_dry_event(asoc,
4267                                        GFP_USER | __GFP_NOWARN);
4268                        if (!event)
4269                                return -ENOMEM;
4270
4271                        asoc->stream.si->enqueue_event(&asoc->ulpq, event);
4272                }
4273        }
4274
4275        return 0;
4276}
4277
4278static int sctp_setsockopt_event(struct sock *sk, struct sctp_event *param,
4279                                 unsigned int optlen)
4280{
4281        struct sctp_sock *sp = sctp_sk(sk);
4282        struct sctp_association *asoc;
4283        int retval = 0;
4284
4285        if (optlen < sizeof(*param))
4286                return -EINVAL;
4287
4288        if (param->se_type < SCTP_SN_TYPE_BASE ||
4289            param->se_type > SCTP_SN_TYPE_MAX)
4290                return -EINVAL;
4291
4292        asoc = sctp_id2assoc(sk, param->se_assoc_id);
4293        if (!asoc && param->se_assoc_id > SCTP_ALL_ASSOC &&
4294            sctp_style(sk, UDP))
4295                return -EINVAL;
4296
4297        if (asoc)
4298                return sctp_assoc_ulpevent_type_set(param, asoc);
4299
4300        if (sctp_style(sk, TCP))
4301                param->se_assoc_id = SCTP_FUTURE_ASSOC;
4302
4303        if (param->se_assoc_id == SCTP_FUTURE_ASSOC ||
4304            param->se_assoc_id == SCTP_ALL_ASSOC)
4305                sctp_ulpevent_type_set(&sp->subscribe,
4306                                       param->se_type, param->se_on);
4307
4308        if (param->se_assoc_id == SCTP_CURRENT_ASSOC ||
4309            param->se_assoc_id == SCTP_ALL_ASSOC) {
4310                list_for_each_entry(asoc, &sp->ep->asocs, asocs) {
4311                        int ret = sctp_assoc_ulpevent_type_set(param, asoc);
4312
4313                        if (ret && !retval)
4314                                retval = ret;
4315                }
4316        }
4317
4318        return retval;
4319}
4320
4321static int sctp_setsockopt_asconf_supported(struct sock *sk,
4322                                            struct sctp_assoc_value *params,
4323                                            unsigned int optlen)
4324{
4325        struct sctp_association *asoc;
4326        struct sctp_endpoint *ep;
4327        int retval = -EINVAL;
4328
4329        if (optlen != sizeof(*params))
4330                goto out;
4331
4332        asoc = sctp_id2assoc(sk, params->assoc_id);
4333        if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4334            sctp_style(sk, UDP))
4335                goto out;
4336
4337        ep = sctp_sk(sk)->ep;
4338        ep->asconf_enable = !!params->assoc_value;
4339
4340        if (ep->asconf_enable && ep->auth_enable) {
4341                sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4342                sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4343        }
4344
4345        retval = 0;
4346
4347out:
4348        return retval;
4349}
4350
4351static int sctp_setsockopt_auth_supported(struct sock *sk,
4352                                          struct sctp_assoc_value *params,
4353                                          unsigned int optlen)
4354{
4355        struct sctp_association *asoc;
4356        struct sctp_endpoint *ep;
4357        int retval = -EINVAL;
4358
4359        if (optlen != sizeof(*params))
4360                goto out;
4361
4362        asoc = sctp_id2assoc(sk, params->assoc_id);
4363        if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4364            sctp_style(sk, UDP))
4365                goto out;
4366
4367        ep = sctp_sk(sk)->ep;
4368        if (params->assoc_value) {
4369                retval = sctp_auth_init(ep, GFP_KERNEL);
4370                if (retval)
4371                        goto out;
4372                if (ep->asconf_enable) {
4373                        sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF);
4374                        sctp_auth_ep_add_chunkid(ep, SCTP_CID_ASCONF_ACK);
4375                }
4376        }
4377
4378        ep->auth_enable = !!params->assoc_value;
4379        retval = 0;
4380
4381out:
4382        return retval;
4383}
4384
4385static int sctp_setsockopt_ecn_supported(struct sock *sk,
4386                                         struct sctp_assoc_value *params,
4387                                         unsigned int optlen)
4388{
4389        struct sctp_association *asoc;
4390        int retval = -EINVAL;
4391
4392        if (optlen != sizeof(*params))
4393                goto out;
4394
4395        asoc = sctp_id2assoc(sk, params->assoc_id);
4396        if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4397            sctp_style(sk, UDP))
4398                goto out;
4399
4400        sctp_sk(sk)->ep->ecn_enable = !!params->assoc_value;
4401        retval = 0;
4402
4403out:
4404        return retval;
4405}
4406
4407static int sctp_setsockopt_pf_expose(struct sock *sk,
4408                                     struct sctp_assoc_value *params,
4409                                     unsigned int optlen)
4410{
4411        struct sctp_association *asoc;
4412        int retval = -EINVAL;
4413
4414        if (optlen != sizeof(*params))
4415                goto out;
4416
4417        if (params->assoc_value > SCTP_PF_EXPOSE_MAX)
4418                goto out;
4419
4420        asoc = sctp_id2assoc(sk, params->assoc_id);
4421        if (!asoc && params->assoc_id != SCTP_FUTURE_ASSOC &&
4422            sctp_style(sk, UDP))
4423                goto out;
4424
4425        if (asoc)
4426                asoc->pf_expose = params->assoc_value;
4427        else
4428                sctp_sk(sk)->pf_expose = params->assoc_value;
4429        retval = 0;
4430
4431out:
4432        return retval;
4433}
4434
4435static int sctp_setsockopt_encap_port(struct sock *sk,
4436                                      struct sctp_udpencaps *encap,
4437                                      unsigned int optlen)
4438{
4439        struct sctp_association *asoc;
4440        struct sctp_transport *t;
4441        __be16 encap_port;
4442
4443        if (optlen != sizeof(*encap))
4444                return -EINVAL;
4445
4446        /* If an address other than INADDR_ANY is specified, and
4447         * no transport is found, then the request is invalid.
4448         */
4449        encap_port = (__force __be16)encap->sue_port;
4450        if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
4451                t = sctp_addr_id2transport(sk, &encap->sue_address,
4452                                           encap->sue_assoc_id);
4453                if (!t)
4454                        return -EINVAL;
4455
4456                t->encap_port = encap_port;
4457                return 0;
4458        }
4459
4460        /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4461         * socket is a one to many style socket, and an association
4462         * was not found, then the id was invalid.
4463         */
4464        asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
4465        if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
4466            sctp_style(sk, UDP))
4467                return -EINVAL;
4468
4469        /* If changes are for association, also apply encap_port to
4470         * each transport.
4471         */
4472        if (asoc) {
4473                list_for_each_entry(t, &asoc->peer.transport_addr_list,
4474                                    transports)
4475                        t->encap_port = encap_port;
4476
4477                asoc->encap_port = encap_port;
4478                return 0;
4479        }
4480
4481        sctp_sk(sk)->encap_port = encap_port;
4482        return 0;
4483}
4484
4485static int sctp_setsockopt_probe_interval(struct sock *sk,
4486                                          struct sctp_probeinterval *params,
4487                                          unsigned int optlen)
4488{
4489        struct sctp_association *asoc;
4490        struct sctp_transport *t;
4491        __u32 probe_interval;
4492
4493        if (optlen != sizeof(*params))
4494                return -EINVAL;
4495
4496        probe_interval = params->spi_interval;
4497        if (probe_interval && probe_interval < SCTP_PROBE_TIMER_MIN)
4498                return -EINVAL;
4499
4500        /* If an address other than INADDR_ANY is specified, and
4501         * no transport is found, then the request is invalid.
4502         */
4503        if (!sctp_is_any(sk, (union sctp_addr *)&params->spi_address)) {
4504                t = sctp_addr_id2transport(sk, &params->spi_address,
4505                                           params->spi_assoc_id);
4506                if (!t)
4507                        return -EINVAL;
4508
4509                t->probe_interval = msecs_to_jiffies(probe_interval);
4510                sctp_transport_pl_reset(t);
4511                return 0;
4512        }
4513
4514        /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
4515         * socket is a one to many style socket, and an association
4516         * was not found, then the id was invalid.
4517         */
4518        asoc = sctp_id2assoc(sk, params->spi_assoc_id);
4519        if (!asoc && params->spi_assoc_id != SCTP_FUTURE_ASSOC &&
4520            sctp_style(sk, UDP))
4521                return -EINVAL;
4522
4523        /* If changes are for association, also apply probe_interval to
4524         * each transport.
4525         */
4526        if (asoc) {
4527                list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) {
4528                        t->probe_interval = msecs_to_jiffies(probe_interval);
4529                        sctp_transport_pl_reset(t);
4530                }
4531
4532                asoc->probe_interval = msecs_to_jiffies(probe_interval);
4533                return 0;
4534        }
4535
4536        sctp_sk(sk)->probe_interval = probe_interval;
4537        return 0;
4538}
4539
4540/* API 6.2 setsockopt(), getsockopt()
4541 *
4542 * Applications use setsockopt() and getsockopt() to set or retrieve
4543 * socket options.  Socket options are used to change the default
4544 * behavior of sockets calls.  They are described in Section 7.
4545 *
4546 * The syntax is:
4547 *
4548 *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
4549 *                    int __user *optlen);
4550 *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
4551 *                    int optlen);
4552 *
4553 *   sd      - the socket descript.
4554 *   level   - set to IPPROTO_SCTP for all SCTP options.
4555 *   optname - the option name.
4556 *   optval  - the buffer to store the value of the option.
4557 *   optlen  - the size of the buffer.
4558 */
4559static int sctp_setsockopt(struct sock *sk, int level, int optname,
4560                           sockptr_t optval, unsigned int optlen)
4561{
4562        void *kopt = NULL;
4563        int retval = 0;
4564
4565        pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
4566
4567        /* I can hardly begin to describe how wrong this is.  This is
4568         * so broken as to be worse than useless.  The API draft
4569         * REALLY is NOT helpful here...  I am not convinced that the
4570         * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
4571         * are at all well-founded.
4572         */
4573        if (level != SOL_SCTP) {
4574                struct sctp_af *af = sctp_sk(sk)->pf->af;
4575
4576                return af->setsockopt(sk, level, optname, optval, optlen);
4577        }
4578
4579        if (optlen > 0) {
4580                /* Trim it to the biggest size sctp sockopt may need if necessary */
4581                optlen = min_t(unsigned int, optlen,
4582                               PAGE_ALIGN(USHRT_MAX +
4583                                          sizeof(__u16) * sizeof(struct sctp_reset_streams)));
4584                kopt = memdup_sockptr(optval, optlen);
4585                if (IS_ERR(kopt))
4586                        return PTR_ERR(kopt);
4587        }
4588
4589        lock_sock(sk);
4590
4591        switch (optname) {
4592        case SCTP_SOCKOPT_BINDX_ADD:
4593                /* 'optlen' is the size of the addresses buffer. */
4594                retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4595                                               SCTP_BINDX_ADD_ADDR);
4596                break;
4597
4598        case SCTP_SOCKOPT_BINDX_REM:
4599                /* 'optlen' is the size of the addresses buffer. */
4600                retval = sctp_setsockopt_bindx(sk, kopt, optlen,
4601                                               SCTP_BINDX_REM_ADDR);
4602                break;
4603
4604        case SCTP_SOCKOPT_CONNECTX_OLD:
4605                /* 'optlen' is the size of the addresses buffer. */
4606                retval = sctp_setsockopt_connectx_old(sk, kopt, optlen);
4607                break;
4608
4609        case SCTP_SOCKOPT_CONNECTX:
4610                /* 'optlen' is the size of the addresses buffer. */
4611                retval = sctp_setsockopt_connectx(sk, kopt, optlen);
4612                break;
4613
4614        case SCTP_DISABLE_FRAGMENTS:
4615                retval = sctp_setsockopt_disable_fragments(sk, kopt, optlen);
4616                break;
4617
4618        case SCTP_EVENTS:
4619                retval = sctp_setsockopt_events(sk, kopt, optlen);
4620                break;
4621
4622        case SCTP_AUTOCLOSE:
4623                retval = sctp_setsockopt_autoclose(sk, kopt, optlen);
4624                break;
4625
4626        case SCTP_PEER_ADDR_PARAMS:
4627                retval = sctp_setsockopt_peer_addr_params(sk, kopt, optlen);
4628                break;
4629
4630        case SCTP_DELAYED_SACK:
4631                retval = sctp_setsockopt_delayed_ack(sk, kopt, optlen);
4632                break;
4633        case SCTP_PARTIAL_DELIVERY_POINT:
4634                retval = sctp_setsockopt_partial_delivery_point(sk, kopt, optlen);
4635                break;
4636
4637        case SCTP_INITMSG:
4638                retval = sctp_setsockopt_initmsg(sk, kopt, optlen);
4639                break;
4640        case SCTP_DEFAULT_SEND_PARAM:
4641                retval = sctp_setsockopt_default_send_param(sk, kopt, optlen);
4642                break;
4643        case SCTP_DEFAULT_SNDINFO:
4644                retval = sctp_setsockopt_default_sndinfo(sk, kopt, optlen);
4645                break;
4646        case SCTP_PRIMARY_ADDR:
4647                retval = sctp_setsockopt_primary_addr(sk, kopt, optlen);
4648                break;
4649        case SCTP_SET_PEER_PRIMARY_ADDR:
4650                retval = sctp_setsockopt_peer_primary_addr(sk, kopt, optlen);
4651                break;
4652        case SCTP_NODELAY:
4653                retval = sctp_setsockopt_nodelay(sk, kopt, optlen);
4654                break;
4655        case SCTP_RTOINFO:
4656                retval = sctp_setsockopt_rtoinfo(sk, kopt, optlen);
4657                break;
4658        case SCTP_ASSOCINFO:
4659                retval = sctp_setsockopt_associnfo(sk, kopt, optlen);
4660                break;
4661        case SCTP_I_WANT_MAPPED_V4_ADDR:
4662                retval = sctp_setsockopt_mappedv4(sk, kopt, optlen);
4663                break;
4664        case SCTP_MAXSEG:
4665                retval = sctp_setsockopt_maxseg(sk, kopt, optlen);
4666                break;
4667        case SCTP_ADAPTATION_LAYER:
4668                retval = sctp_setsockopt_adaptation_layer(sk, kopt, optlen);
4669                break;
4670        case SCTP_CONTEXT:
4671                retval = sctp_setsockopt_context(sk, kopt, optlen);
4672                break;
4673        case SCTP_FRAGMENT_INTERLEAVE:
4674                retval = sctp_setsockopt_fragment_interleave(sk, kopt, optlen);
4675                break;
4676        case SCTP_MAX_BURST:
4677                retval = sctp_setsockopt_maxburst(sk, kopt, optlen);
4678                break;
4679        case SCTP_AUTH_CHUNK:
4680                retval = sctp_setsockopt_auth_chunk(sk, kopt, optlen);
4681                break;
4682        case SCTP_HMAC_IDENT:
4683                retval = sctp_setsockopt_hmac_ident(sk, kopt, optlen);
4684                break;
4685        case SCTP_AUTH_KEY:
4686                retval = sctp_setsockopt_auth_key(sk, kopt, optlen);
4687                break;
4688        case SCTP_AUTH_ACTIVE_KEY:
4689                retval = sctp_setsockopt_active_key(sk, kopt, optlen);
4690                break;
4691        case SCTP_AUTH_DELETE_KEY: