linux/net/ipv4/inet_connection_sock.c
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   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Support for INET connection oriented protocols.
   7 *
   8 * Authors:     See the TCP sources
   9 *
  10 *              This program is free software; you can redistribute it and/or
  11 *              modify it under the terms of the GNU General Public License
  12 *              as published by the Free Software Foundation; either version
  13 *              2 of the License, or(at your option) any later version.
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/jhash.h>
  18
  19#include <net/inet_connection_sock.h>
  20#include <net/inet_hashtables.h>
  21#include <net/inet_timewait_sock.h>
  22#include <net/ip.h>
  23#include <net/route.h>
  24#include <net/tcp_states.h>
  25#include <net/xfrm.h>
  26
  27#ifdef INET_CSK_DEBUG
  28const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";
  29EXPORT_SYMBOL(inet_csk_timer_bug_msg);
  30#endif
  31
  32/*
  33 * This array holds the first and last local port number.
  34 */
  35int sysctl_local_port_range[2] = { 32768, 61000 };
  36DEFINE_SEQLOCK(sysctl_port_range_lock);
  37
  38void inet_get_local_port_range(int *low, int *high)
  39{
  40        unsigned seq;
  41        do {
  42                seq = read_seqbegin(&sysctl_port_range_lock);
  43
  44                *low = sysctl_local_port_range[0];
  45                *high = sysctl_local_port_range[1];
  46        } while (read_seqretry(&sysctl_port_range_lock, seq));
  47}
  48EXPORT_SYMBOL(inet_get_local_port_range);
  49
  50int inet_csk_bind_conflict(const struct sock *sk,
  51                           const struct inet_bind_bucket *tb)
  52{
  53        const __be32 sk_rcv_saddr = inet_rcv_saddr(sk);
  54        struct sock *sk2;
  55        struct hlist_node *node;
  56        int reuse = sk->sk_reuse;
  57
  58        /*
  59         * Unlike other sk lookup places we do not check
  60         * for sk_net here, since _all_ the socks listed
  61         * in tb->owners list belong to the same net - the
  62         * one this bucket belongs to.
  63         */
  64
  65        sk_for_each_bound(sk2, node, &tb->owners) {
  66                if (sk != sk2 &&
  67                    !inet_v6_ipv6only(sk2) &&
  68                    (!sk->sk_bound_dev_if ||
  69                     !sk2->sk_bound_dev_if ||
  70                     sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) {
  71                        if (!reuse || !sk2->sk_reuse ||
  72                            sk2->sk_state == TCP_LISTEN) {
  73                                const __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
  74                                if (!sk2_rcv_saddr || !sk_rcv_saddr ||
  75                                    sk2_rcv_saddr == sk_rcv_saddr)
  76                                        break;
  77                        }
  78                }
  79        }
  80        return node != NULL;
  81}
  82
  83EXPORT_SYMBOL_GPL(inet_csk_bind_conflict);
  84
  85/* Obtain a reference to a local port for the given sock,
  86 * if snum is zero it means select any available local port.
  87 */
  88int inet_csk_get_port(struct sock *sk, unsigned short snum)
  89{
  90        struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
  91        struct inet_bind_hashbucket *head;
  92        struct hlist_node *node;
  93        struct inet_bind_bucket *tb;
  94        int ret;
  95        struct net *net = sock_net(sk);
  96
  97        local_bh_disable();
  98        if (!snum) {
  99                int remaining, rover, low, high;
 100
 101                inet_get_local_port_range(&low, &high);
 102                remaining = (high - low) + 1;
 103                rover = net_random() % remaining + low;
 104
 105                do {
 106                        head = &hashinfo->bhash[inet_bhashfn(net, rover,
 107                                        hashinfo->bhash_size)];
 108                        spin_lock(&head->lock);
 109                        inet_bind_bucket_for_each(tb, node, &head->chain)
 110                                if (tb->ib_net == net && tb->port == rover)
 111                                        goto next;
 112                        break;
 113                next:
 114                        spin_unlock(&head->lock);
 115                        if (++rover > high)
 116                                rover = low;
 117                } while (--remaining > 0);
 118
 119                /* Exhausted local port range during search?  It is not
 120                 * possible for us to be holding one of the bind hash
 121                 * locks if this test triggers, because if 'remaining'
 122                 * drops to zero, we broke out of the do/while loop at
 123                 * the top level, not from the 'break;' statement.
 124                 */
 125                ret = 1;
 126                if (remaining <= 0)
 127                        goto fail;
 128
 129                /* OK, here is the one we will use.  HEAD is
 130                 * non-NULL and we hold it's mutex.
 131                 */
 132                snum = rover;
 133        } else {
 134                head = &hashinfo->bhash[inet_bhashfn(net, snum,
 135                                hashinfo->bhash_size)];
 136                spin_lock(&head->lock);
 137                inet_bind_bucket_for_each(tb, node, &head->chain)
 138                        if (tb->ib_net == net && tb->port == snum)
 139                                goto tb_found;
 140        }
 141        tb = NULL;
 142        goto tb_not_found;
 143tb_found:
 144        if (!hlist_empty(&tb->owners)) {
 145                if (tb->fastreuse > 0 &&
 146                    sk->sk_reuse && sk->sk_state != TCP_LISTEN) {
 147                        goto success;
 148                } else {
 149                        ret = 1;
 150                        if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb))
 151                                goto fail_unlock;
 152                }
 153        }
 154tb_not_found:
 155        ret = 1;
 156        if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep,
 157                                        net, head, snum)) == NULL)
 158                goto fail_unlock;
 159        if (hlist_empty(&tb->owners)) {
 160                if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
 161                        tb->fastreuse = 1;
 162                else
 163                        tb->fastreuse = 0;
 164        } else if (tb->fastreuse &&
 165                   (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
 166                tb->fastreuse = 0;
 167success:
 168        if (!inet_csk(sk)->icsk_bind_hash)
 169                inet_bind_hash(sk, tb, snum);
 170        WARN_ON(inet_csk(sk)->icsk_bind_hash != tb);
 171        ret = 0;
 172
 173fail_unlock:
 174        spin_unlock(&head->lock);
 175fail:
 176        local_bh_enable();
 177        return ret;
 178}
 179
 180EXPORT_SYMBOL_GPL(inet_csk_get_port);
 181
 182/*
 183 * Wait for an incoming connection, avoid race conditions. This must be called
 184 * with the socket locked.
 185 */
 186static int inet_csk_wait_for_connect(struct sock *sk, long timeo)
 187{
 188        struct inet_connection_sock *icsk = inet_csk(sk);
 189        DEFINE_WAIT(wait);
 190        int err;
 191
 192        /*
 193         * True wake-one mechanism for incoming connections: only
 194         * one process gets woken up, not the 'whole herd'.
 195         * Since we do not 'race & poll' for established sockets
 196         * anymore, the common case will execute the loop only once.
 197         *
 198         * Subtle issue: "add_wait_queue_exclusive()" will be added
 199         * after any current non-exclusive waiters, and we know that
 200         * it will always _stay_ after any new non-exclusive waiters
 201         * because all non-exclusive waiters are added at the
 202         * beginning of the wait-queue. As such, it's ok to "drop"
 203         * our exclusiveness temporarily when we get woken up without
 204         * having to remove and re-insert us on the wait queue.
 205         */
 206        for (;;) {
 207                prepare_to_wait_exclusive(sk->sk_sleep, &wait,
 208                                          TASK_INTERRUPTIBLE);
 209                release_sock(sk);
 210                if (reqsk_queue_empty(&icsk->icsk_accept_queue))
 211                        timeo = schedule_timeout(timeo);
 212                lock_sock(sk);
 213                err = 0;
 214                if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
 215                        break;
 216                err = -EINVAL;
 217                if (sk->sk_state != TCP_LISTEN)
 218                        break;
 219                err = sock_intr_errno(timeo);
 220                if (signal_pending(current))
 221                        break;
 222                err = -EAGAIN;
 223                if (!timeo)
 224                        break;
 225        }
 226        finish_wait(sk->sk_sleep, &wait);
 227        return err;
 228}
 229
 230/*
 231 * This will accept the next outstanding connection.
 232 */
 233struct sock *inet_csk_accept(struct sock *sk, int flags, int *err)
 234{
 235        struct inet_connection_sock *icsk = inet_csk(sk);
 236        struct sock *newsk;
 237        int error;
 238
 239        lock_sock(sk);
 240
 241        /* We need to make sure that this socket is listening,
 242         * and that it has something pending.
 243         */
 244        error = -EINVAL;
 245        if (sk->sk_state != TCP_LISTEN)
 246                goto out_err;
 247
 248        /* Find already established connection */
 249        if (reqsk_queue_empty(&icsk->icsk_accept_queue)) {
 250                long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 251
 252                /* If this is a non blocking socket don't sleep */
 253                error = -EAGAIN;
 254                if (!timeo)
 255                        goto out_err;
 256
 257                error = inet_csk_wait_for_connect(sk, timeo);
 258                if (error)
 259                        goto out_err;
 260        }
 261
 262        newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk);
 263        WARN_ON(newsk->sk_state == TCP_SYN_RECV);
 264out:
 265        release_sock(sk);
 266        return newsk;
 267out_err:
 268        newsk = NULL;
 269        *err = error;
 270        goto out;
 271}
 272
 273EXPORT_SYMBOL(inet_csk_accept);
 274
 275/*
 276 * Using different timers for retransmit, delayed acks and probes
 277 * We may wish use just one timer maintaining a list of expire jiffies
 278 * to optimize.
 279 */
 280void inet_csk_init_xmit_timers(struct sock *sk,
 281                               void (*retransmit_handler)(unsigned long),
 282                               void (*delack_handler)(unsigned long),
 283                               void (*keepalive_handler)(unsigned long))
 284{
 285        struct inet_connection_sock *icsk = inet_csk(sk);
 286
 287        setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler,
 288                        (unsigned long)sk);
 289        setup_timer(&icsk->icsk_delack_timer, delack_handler,
 290                        (unsigned long)sk);
 291        setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk);
 292        icsk->icsk_pending = icsk->icsk_ack.pending = 0;
 293}
 294
 295EXPORT_SYMBOL(inet_csk_init_xmit_timers);
 296
 297void inet_csk_clear_xmit_timers(struct sock *sk)
 298{
 299        struct inet_connection_sock *icsk = inet_csk(sk);
 300
 301        icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0;
 302
 303        sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
 304        sk_stop_timer(sk, &icsk->icsk_delack_timer);
 305        sk_stop_timer(sk, &sk->sk_timer);
 306}
 307
 308EXPORT_SYMBOL(inet_csk_clear_xmit_timers);
 309
 310void inet_csk_delete_keepalive_timer(struct sock *sk)
 311{
 312        sk_stop_timer(sk, &sk->sk_timer);
 313}
 314
 315EXPORT_SYMBOL(inet_csk_delete_keepalive_timer);
 316
 317void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len)
 318{
 319        sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
 320}
 321
 322EXPORT_SYMBOL(inet_csk_reset_keepalive_timer);
 323
 324struct dst_entry* inet_csk_route_req(struct sock *sk,
 325                                     const struct request_sock *req)
 326{
 327        struct rtable *rt;
 328        const struct inet_request_sock *ireq = inet_rsk(req);
 329        struct ip_options *opt = inet_rsk(req)->opt;
 330        struct flowi fl = { .oif = sk->sk_bound_dev_if,
 331                            .nl_u = { .ip4_u =
 332                                      { .daddr = ((opt && opt->srr) ?
 333                                                  opt->faddr :
 334                                                  ireq->rmt_addr),
 335                                        .saddr = ireq->loc_addr,
 336                                        .tos = RT_CONN_FLAGS(sk) } },
 337                            .proto = sk->sk_protocol,
 338                            .uli_u = { .ports =
 339                                       { .sport = inet_sk(sk)->sport,
 340                                         .dport = ireq->rmt_port } } };
 341        struct net *net = sock_net(sk);
 342
 343        security_req_classify_flow(req, &fl);
 344        if (ip_route_output_flow(net, &rt, &fl, sk, 0)) {
 345                IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
 346                return NULL;
 347        }
 348        if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) {
 349                ip_rt_put(rt);
 350                IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
 351                return NULL;
 352        }
 353        return &rt->u.dst;
 354}
 355
 356EXPORT_SYMBOL_GPL(inet_csk_route_req);
 357
 358static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport,
 359                                 const u32 rnd, const u32 synq_hsize)
 360{
 361        return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1);
 362}
 363
 364#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 365#define AF_INET_FAMILY(fam) ((fam) == AF_INET)
 366#else
 367#define AF_INET_FAMILY(fam) 1
 368#endif
 369
 370struct request_sock *inet_csk_search_req(const struct sock *sk,
 371                                         struct request_sock ***prevp,
 372                                         const __be16 rport, const __be32 raddr,
 373                                         const __be32 laddr)
 374{
 375        const struct inet_connection_sock *icsk = inet_csk(sk);
 376        struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
 377        struct request_sock *req, **prev;
 378
 379        for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd,
 380                                                    lopt->nr_table_entries)];
 381             (req = *prev) != NULL;
 382             prev = &req->dl_next) {
 383                const struct inet_request_sock *ireq = inet_rsk(req);
 384
 385                if (ireq->rmt_port == rport &&
 386                    ireq->rmt_addr == raddr &&
 387                    ireq->loc_addr == laddr &&
 388                    AF_INET_FAMILY(req->rsk_ops->family)) {
 389                        WARN_ON(req->sk);
 390                        *prevp = prev;
 391                        break;
 392                }
 393        }
 394
 395        return req;
 396}
 397
 398EXPORT_SYMBOL_GPL(inet_csk_search_req);
 399
 400void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
 401                                   unsigned long timeout)
 402{
 403        struct inet_connection_sock *icsk = inet_csk(sk);
 404        struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
 405        const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port,
 406                                     lopt->hash_rnd, lopt->nr_table_entries);
 407
 408        reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
 409        inet_csk_reqsk_queue_added(sk, timeout);
 410}
 411
 412/* Only thing we need from tcp.h */
 413extern int sysctl_tcp_synack_retries;
 414
 415EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
 416
 417void inet_csk_reqsk_queue_prune(struct sock *parent,
 418                                const unsigned long interval,
 419                                const unsigned long timeout,
 420                                const unsigned long max_rto)
 421{
 422        struct inet_connection_sock *icsk = inet_csk(parent);
 423        struct request_sock_queue *queue = &icsk->icsk_accept_queue;
 424        struct listen_sock *lopt = queue->listen_opt;
 425        int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
 426        int thresh = max_retries;
 427        unsigned long now = jiffies;
 428        struct request_sock **reqp, *req;
 429        int i, budget;
 430
 431        if (lopt == NULL || lopt->qlen == 0)
 432                return;
 433
 434        /* Normally all the openreqs are young and become mature
 435         * (i.e. converted to established socket) for first timeout.
 436         * If synack was not acknowledged for 3 seconds, it means
 437         * one of the following things: synack was lost, ack was lost,
 438         * rtt is high or nobody planned to ack (i.e. synflood).
 439         * When server is a bit loaded, queue is populated with old
 440         * open requests, reducing effective size of queue.
 441         * When server is well loaded, queue size reduces to zero
 442         * after several minutes of work. It is not synflood,
 443         * it is normal operation. The solution is pruning
 444         * too old entries overriding normal timeout, when
 445         * situation becomes dangerous.
 446         *
 447         * Essentially, we reserve half of room for young
 448         * embrions; and abort old ones without pity, if old
 449         * ones are about to clog our table.
 450         */
 451        if (lopt->qlen>>(lopt->max_qlen_log-1)) {
 452                int young = (lopt->qlen_young<<1);
 453
 454                while (thresh > 2) {
 455                        if (lopt->qlen < young)
 456                                break;
 457                        thresh--;
 458                        young <<= 1;
 459                }
 460        }
 461
 462        if (queue->rskq_defer_accept)
 463                max_retries = queue->rskq_defer_accept;
 464
 465        budget = 2 * (lopt->nr_table_entries / (timeout / interval));
 466        i = lopt->clock_hand;
 467
 468        do {
 469                reqp=&lopt->syn_table[i];
 470                while ((req = *reqp) != NULL) {
 471                        if (time_after_eq(now, req->expires)) {
 472                                if ((req->retrans < thresh ||
 473                                     (inet_rsk(req)->acked && req->retrans < max_retries))
 474                                    && !req->rsk_ops->rtx_syn_ack(parent, req)) {
 475                                        unsigned long timeo;
 476
 477                                        if (req->retrans++ == 0)
 478                                                lopt->qlen_young--;
 479                                        timeo = min((timeout << req->retrans), max_rto);
 480                                        req->expires = now + timeo;
 481                                        reqp = &req->dl_next;
 482                                        continue;
 483                                }
 484
 485                                /* Drop this request */
 486                                inet_csk_reqsk_queue_unlink(parent, req, reqp);
 487                                reqsk_queue_removed(queue, req);
 488                                reqsk_free(req);
 489                                continue;
 490                        }
 491                        reqp = &req->dl_next;
 492                }
 493
 494                i = (i + 1) & (lopt->nr_table_entries - 1);
 495
 496        } while (--budget > 0);
 497
 498        lopt->clock_hand = i;
 499
 500        if (lopt->qlen)
 501                inet_csk_reset_keepalive_timer(parent, interval);
 502}
 503
 504EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune);
 505
 506struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req,
 507                            const gfp_t priority)
 508{
 509        struct sock *newsk = sk_clone(sk, priority);
 510
 511        if (newsk != NULL) {
 512                struct inet_connection_sock *newicsk = inet_csk(newsk);
 513
 514                newsk->sk_state = TCP_SYN_RECV;
 515                newicsk->icsk_bind_hash = NULL;
 516
 517                inet_sk(newsk)->dport = inet_rsk(req)->rmt_port;
 518                newsk->sk_write_space = sk_stream_write_space;
 519
 520                newicsk->icsk_retransmits = 0;
 521                newicsk->icsk_backoff     = 0;
 522                newicsk->icsk_probes_out  = 0;
 523
 524                /* Deinitialize accept_queue to trap illegal accesses. */
 525                memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue));
 526
 527                security_inet_csk_clone(newsk, req);
 528        }
 529        return newsk;
 530}
 531
 532EXPORT_SYMBOL_GPL(inet_csk_clone);
 533
 534/*
 535 * At this point, there should be no process reference to this
 536 * socket, and thus no user references at all.  Therefore we
 537 * can assume the socket waitqueue is inactive and nobody will
 538 * try to jump onto it.
 539 */
 540void inet_csk_destroy_sock(struct sock *sk)
 541{
 542        WARN_ON(sk->sk_state != TCP_CLOSE);
 543        WARN_ON(!sock_flag(sk, SOCK_DEAD));
 544
 545        /* It cannot be in hash table! */
 546        WARN_ON(!sk_unhashed(sk));
 547
 548        /* If it has not 0 inet_sk(sk)->num, it must be bound */
 549        WARN_ON(inet_sk(sk)->num && !inet_csk(sk)->icsk_bind_hash);
 550
 551        sk->sk_prot->destroy(sk);
 552
 553        sk_stream_kill_queues(sk);
 554
 555        xfrm_sk_free_policy(sk);
 556
 557        sk_refcnt_debug_release(sk);
 558
 559        atomic_dec(sk->sk_prot->orphan_count);
 560        sock_put(sk);
 561}
 562
 563EXPORT_SYMBOL(inet_csk_destroy_sock);
 564
 565int inet_csk_listen_start(struct sock *sk, const int nr_table_entries)
 566{
 567        struct inet_sock *inet = inet_sk(sk);
 568        struct inet_connection_sock *icsk = inet_csk(sk);
 569        int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries);
 570
 571        if (rc != 0)
 572                return rc;
 573
 574        sk->sk_max_ack_backlog = 0;
 575        sk->sk_ack_backlog = 0;
 576        inet_csk_delack_init(sk);
 577
 578        /* There is race window here: we announce ourselves listening,
 579         * but this transition is still not validated by get_port().
 580         * It is OK, because this socket enters to hash table only
 581         * after validation is complete.
 582         */
 583        sk->sk_state = TCP_LISTEN;
 584        if (!sk->sk_prot->get_port(sk, inet->num)) {
 585                inet->sport = htons(inet->num);
 586
 587                sk_dst_reset(sk);
 588                sk->sk_prot->hash(sk);
 589
 590                return 0;
 591        }
 592
 593        sk->sk_state = TCP_CLOSE;
 594        __reqsk_queue_destroy(&icsk->icsk_accept_queue);
 595        return -EADDRINUSE;
 596}
 597
 598EXPORT_SYMBOL_GPL(inet_csk_listen_start);
 599
 600/*
 601 *      This routine closes sockets which have been at least partially
 602 *      opened, but not yet accepted.
 603 */
 604void inet_csk_listen_stop(struct sock *sk)
 605{
 606        struct inet_connection_sock *icsk = inet_csk(sk);
 607        struct request_sock *acc_req;
 608        struct request_sock *req;
 609
 610        inet_csk_delete_keepalive_timer(sk);
 611
 612        /* make all the listen_opt local to us */
 613        acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue);
 614
 615        /* Following specs, it would be better either to send FIN
 616         * (and enter FIN-WAIT-1, it is normal close)
 617         * or to send active reset (abort).
 618         * Certainly, it is pretty dangerous while synflood, but it is
 619         * bad justification for our negligence 8)
 620         * To be honest, we are not able to make either
 621         * of the variants now.                 --ANK
 622         */
 623        reqsk_queue_destroy(&icsk->icsk_accept_queue);
 624
 625        while ((req = acc_req) != NULL) {
 626                struct sock *child = req->sk;
 627
 628                acc_req = req->dl_next;
 629
 630                local_bh_disable();
 631                bh_lock_sock(child);
 632                WARN_ON(sock_owned_by_user(child));
 633                sock_hold(child);
 634
 635                sk->sk_prot->disconnect(child, O_NONBLOCK);
 636
 637                sock_orphan(child);
 638
 639                atomic_inc(sk->sk_prot->orphan_count);
 640
 641                inet_csk_destroy_sock(child);
 642
 643                bh_unlock_sock(child);
 644                local_bh_enable();
 645                sock_put(child);
 646
 647                sk_acceptq_removed(sk);
 648                __reqsk_free(req);
 649        }
 650        WARN_ON(sk->sk_ack_backlog);
 651}
 652
 653EXPORT_SYMBOL_GPL(inet_csk_listen_stop);
 654
 655void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
 656{
 657        struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
 658        const struct inet_sock *inet = inet_sk(sk);
 659
 660        sin->sin_family         = AF_INET;
 661        sin->sin_addr.s_addr    = inet->daddr;
 662        sin->sin_port           = inet->dport;
 663}
 664
 665EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr);
 666
 667#ifdef CONFIG_COMPAT
 668int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
 669                               char __user *optval, int __user *optlen)
 670{
 671        const struct inet_connection_sock *icsk = inet_csk(sk);
 672
 673        if (icsk->icsk_af_ops->compat_getsockopt != NULL)
 674                return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname,
 675                                                            optval, optlen);
 676        return icsk->icsk_af_ops->getsockopt(sk, level, optname,
 677                                             optval, optlen);
 678}
 679
 680EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt);
 681
 682int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
 683                               char __user *optval, int optlen)
 684{
 685        const struct inet_connection_sock *icsk = inet_csk(sk);
 686
 687        if (icsk->icsk_af_ops->compat_setsockopt != NULL)
 688                return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname,
 689                                                            optval, optlen);
 690        return icsk->icsk_af_ops->setsockopt(sk, level, optname,
 691                                             optval, optlen);
 692}
 693
 694EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt);
 695#endif
 696
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