inet_connection_sock.c revision 8d238b25b1ec22a73b1c2206f111df2faaff8285
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 struct holds the first and last local port number. 34 */ 35struct local_ports sysctl_local_ports __read_mostly = { 36 .lock = SEQLOCK_UNLOCKED, 37 .range = { 32768, 61000 }, 38}; 39 40void inet_get_local_port_range(int *low, int *high) 41{ 42 unsigned seq; 43 do { 44 seq = read_seqbegin(&sysctl_local_ports.lock); 45 46 *low = sysctl_local_ports.range[0]; 47 *high = sysctl_local_ports.range[1]; 48 } while (read_seqretry(&sysctl_local_ports.lock, seq)); 49} 50EXPORT_SYMBOL(inet_get_local_port_range); 51 52int inet_csk_bind_conflict(const struct sock *sk, 53 const struct inet_bind_bucket *tb) 54{ 55 const __be32 sk_rcv_saddr = inet_rcv_saddr(sk); 56 struct sock *sk2; 57 struct hlist_node *node; 58 int reuse = sk->sk_reuse; 59 60 /* 61 * Unlike other sk lookup places we do not check 62 * for sk_net here, since _all_ the socks listed 63 * in tb->owners list belong to the same net - the 64 * one this bucket belongs to. 65 */ 66 67 sk_for_each_bound(sk2, node, &tb->owners) { 68 if (sk != sk2 && 69 !inet_v6_ipv6only(sk2) && 70 (!sk->sk_bound_dev_if || 71 !sk2->sk_bound_dev_if || 72 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { 73 if (!reuse || !sk2->sk_reuse || 74 sk2->sk_state == TCP_LISTEN) { 75 const __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 76 if (!sk2_rcv_saddr || !sk_rcv_saddr || 77 sk2_rcv_saddr == sk_rcv_saddr) 78 break; 79 } 80 } 81 } 82 return node != NULL; 83} 84 85EXPORT_SYMBOL_GPL(inet_csk_bind_conflict); 86 87/* Obtain a reference to a local port for the given sock, 88 * if snum is zero it means select any available local port. 89 */ 90int inet_csk_get_port(struct sock *sk, unsigned short snum) 91{ 92 struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; 93 struct inet_bind_hashbucket *head; 94 struct hlist_node *node; 95 struct inet_bind_bucket *tb; 96 int ret, attempts = 5; 97 struct net *net = sock_net(sk); 98 int smallest_size = -1, smallest_rover; 99 100 local_bh_disable(); 101 if (!snum) { 102 int remaining, rover, low, high; 103 104again: 105 inet_get_local_port_range(&low, &high); 106 remaining = (high - low) + 1; 107 smallest_rover = rover = net_random() % remaining + low; 108 109 smallest_size = -1; 110 do { 111 head = &hashinfo->bhash[inet_bhashfn(net, rover, 112 hashinfo->bhash_size)]; 113 spin_lock(&head->lock); 114 inet_bind_bucket_for_each(tb, node, &head->chain) 115 if (net_eq(ib_net(tb), net) && tb->port == rover) { 116 if (tb->fastreuse > 0 && 117 sk->sk_reuse && 118 sk->sk_state != TCP_LISTEN && 119 (tb->num_owners < smallest_size || smallest_size == -1)) { 120 smallest_size = tb->num_owners; 121 smallest_rover = rover; 122 if (atomic_read(&hashinfo->bsockets) > (high - low) + 1) { 123 spin_unlock(&head->lock); 124 snum = smallest_rover; 125 goto have_snum; 126 } 127 } 128 goto next; 129 } 130 break; 131 next: 132 spin_unlock(&head->lock); 133 if (++rover > high) 134 rover = low; 135 } while (--remaining > 0); 136 137 /* Exhausted local port range during search? It is not 138 * possible for us to be holding one of the bind hash 139 * locks if this test triggers, because if 'remaining' 140 * drops to zero, we broke out of the do/while loop at 141 * the top level, not from the 'break;' statement. 142 */ 143 ret = 1; 144 if (remaining <= 0) { 145 if (smallest_size != -1) { 146 snum = smallest_rover; 147 goto have_snum; 148 } 149 goto fail; 150 } 151 /* OK, here is the one we will use. HEAD is 152 * non-NULL and we hold it's mutex. 153 */ 154 snum = rover; 155 } else { 156have_snum: 157 head = &hashinfo->bhash[inet_bhashfn(net, snum, 158 hashinfo->bhash_size)]; 159 spin_lock(&head->lock); 160 inet_bind_bucket_for_each(tb, node, &head->chain) 161 if (net_eq(ib_net(tb), net) && tb->port == snum) 162 goto tb_found; 163 } 164 tb = NULL; 165 goto tb_not_found; 166tb_found: 167 if (!hlist_empty(&tb->owners)) { 168 if (tb->fastreuse > 0 && 169 sk->sk_reuse && sk->sk_state != TCP_LISTEN && 170 smallest_size == -1) { 171 goto success; 172 } else { 173 ret = 1; 174 if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb)) { 175 if (sk->sk_reuse && sk->sk_state != TCP_LISTEN && 176 smallest_size != -1 && --attempts >= 0) { 177 spin_unlock(&head->lock); 178 goto again; 179 } 180 goto fail_unlock; 181 } 182 } 183 } 184tb_not_found: 185 ret = 1; 186 if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, 187 net, head, snum)) == NULL) 188 goto fail_unlock; 189 if (hlist_empty(&tb->owners)) { 190 if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) 191 tb->fastreuse = 1; 192 else 193 tb->fastreuse = 0; 194 } else if (tb->fastreuse && 195 (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) 196 tb->fastreuse = 0; 197success: 198 if (!inet_csk(sk)->icsk_bind_hash) 199 inet_bind_hash(sk, tb, snum); 200 WARN_ON(inet_csk(sk)->icsk_bind_hash != tb); 201 ret = 0; 202 203fail_unlock: 204 spin_unlock(&head->lock); 205fail: 206 local_bh_enable(); 207 return ret; 208} 209 210EXPORT_SYMBOL_GPL(inet_csk_get_port); 211 212/* 213 * Wait for an incoming connection, avoid race conditions. This must be called 214 * with the socket locked. 215 */ 216static int inet_csk_wait_for_connect(struct sock *sk, long timeo) 217{ 218 struct inet_connection_sock *icsk = inet_csk(sk); 219 DEFINE_WAIT(wait); 220 int err; 221 222 /* 223 * True wake-one mechanism for incoming connections: only 224 * one process gets woken up, not the 'whole herd'. 225 * Since we do not 'race & poll' for established sockets 226 * anymore, the common case will execute the loop only once. 227 * 228 * Subtle issue: "add_wait_queue_exclusive()" will be added 229 * after any current non-exclusive waiters, and we know that 230 * it will always _stay_ after any new non-exclusive waiters 231 * because all non-exclusive waiters are added at the 232 * beginning of the wait-queue. As such, it's ok to "drop" 233 * our exclusiveness temporarily when we get woken up without 234 * having to remove and re-insert us on the wait queue. 235 */ 236 for (;;) { 237 prepare_to_wait_exclusive(sk->sk_sleep, &wait, 238 TASK_INTERRUPTIBLE); 239 release_sock(sk); 240 if (reqsk_queue_empty(&icsk->icsk_accept_queue)) 241 timeo = schedule_timeout(timeo); 242 lock_sock(sk); 243 err = 0; 244 if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) 245 break; 246 err = -EINVAL; 247 if (sk->sk_state != TCP_LISTEN) 248 break; 249 err = sock_intr_errno(timeo); 250 if (signal_pending(current)) 251 break; 252 err = -EAGAIN; 253 if (!timeo) 254 break; 255 } 256 finish_wait(sk->sk_sleep, &wait); 257 return err; 258} 259 260/* 261 * This will accept the next outstanding connection. 262 */ 263struct sock *inet_csk_accept(struct sock *sk, int flags, int *err) 264{ 265 struct inet_connection_sock *icsk = inet_csk(sk); 266 struct sock *newsk; 267 int error; 268 269 lock_sock(sk); 270 271 /* We need to make sure that this socket is listening, 272 * and that it has something pending. 273 */ 274 error = -EINVAL; 275 if (sk->sk_state != TCP_LISTEN) 276 goto out_err; 277 278 /* Find already established connection */ 279 if (reqsk_queue_empty(&icsk->icsk_accept_queue)) { 280 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 281 282 /* If this is a non blocking socket don't sleep */ 283 error = -EAGAIN; 284 if (!timeo) 285 goto out_err; 286 287 error = inet_csk_wait_for_connect(sk, timeo); 288 if (error) 289 goto out_err; 290 } 291 292 newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk); 293 WARN_ON(newsk->sk_state == TCP_SYN_RECV); 294out: 295 release_sock(sk); 296 return newsk; 297out_err: 298 newsk = NULL; 299 *err = error; 300 goto out; 301} 302 303EXPORT_SYMBOL(inet_csk_accept); 304 305/* 306 * Using different timers for retransmit, delayed acks and probes 307 * We may wish use just one timer maintaining a list of expire jiffies 308 * to optimize. 309 */ 310void inet_csk_init_xmit_timers(struct sock *sk, 311 void (*retransmit_handler)(unsigned long), 312 void (*delack_handler)(unsigned long), 313 void (*keepalive_handler)(unsigned long)) 314{ 315 struct inet_connection_sock *icsk = inet_csk(sk); 316 317 setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler, 318 (unsigned long)sk); 319 setup_timer(&icsk->icsk_delack_timer, delack_handler, 320 (unsigned long)sk); 321 setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk); 322 icsk->icsk_pending = icsk->icsk_ack.pending = 0; 323} 324 325EXPORT_SYMBOL(inet_csk_init_xmit_timers); 326 327void inet_csk_clear_xmit_timers(struct sock *sk) 328{ 329 struct inet_connection_sock *icsk = inet_csk(sk); 330 331 icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0; 332 333 sk_stop_timer(sk, &icsk->icsk_retransmit_timer); 334 sk_stop_timer(sk, &icsk->icsk_delack_timer); 335 sk_stop_timer(sk, &sk->sk_timer); 336} 337 338EXPORT_SYMBOL(inet_csk_clear_xmit_timers); 339 340void inet_csk_delete_keepalive_timer(struct sock *sk) 341{ 342 sk_stop_timer(sk, &sk->sk_timer); 343} 344 345EXPORT_SYMBOL(inet_csk_delete_keepalive_timer); 346 347void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len) 348{ 349 sk_reset_timer(sk, &sk->sk_timer, jiffies + len); 350} 351 352EXPORT_SYMBOL(inet_csk_reset_keepalive_timer); 353 354struct dst_entry *inet_csk_route_req(struct sock *sk, 355 const struct request_sock *req) 356{ 357 struct rtable *rt; 358 const struct inet_request_sock *ireq = inet_rsk(req); 359 struct ip_options *opt = inet_rsk(req)->opt; 360 struct flowi fl = { .oif = sk->sk_bound_dev_if, 361 .mark = sk->sk_mark, 362 .nl_u = { .ip4_u = 363 { .daddr = ((opt && opt->srr) ? 364 opt->faddr : 365 ireq->rmt_addr), 366 .saddr = ireq->loc_addr, 367 .tos = RT_CONN_FLAGS(sk) } }, 368 .proto = sk->sk_protocol, 369 .flags = inet_sk_flowi_flags(sk), 370 .uli_u = { .ports = 371 { .sport = inet_sk(sk)->inet_sport, 372 .dport = ireq->rmt_port } } }; 373 struct net *net = sock_net(sk); 374 375 security_req_classify_flow(req, &fl); 376 if (ip_route_output_flow(net, &rt, &fl, sk, 0)) 377 goto no_route; 378 if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) 379 goto route_err; 380 return &rt->u.dst; 381 382route_err: 383 ip_rt_put(rt); 384no_route: 385 IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); 386 return NULL; 387} 388 389EXPORT_SYMBOL_GPL(inet_csk_route_req); 390 391static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport, 392 const u32 rnd, const u32 synq_hsize) 393{ 394 return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1); 395} 396 397#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 398#define AF_INET_FAMILY(fam) ((fam) == AF_INET) 399#else 400#define AF_INET_FAMILY(fam) 1 401#endif 402 403struct request_sock *inet_csk_search_req(const struct sock *sk, 404 struct request_sock ***prevp, 405 const __be16 rport, const __be32 raddr, 406 const __be32 laddr) 407{ 408 const struct inet_connection_sock *icsk = inet_csk(sk); 409 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 410 struct request_sock *req, **prev; 411 412 for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd, 413 lopt->nr_table_entries)]; 414 (req = *prev) != NULL; 415 prev = &req->dl_next) { 416 const struct inet_request_sock *ireq = inet_rsk(req); 417 418 if (ireq->rmt_port == rport && 419 ireq->rmt_addr == raddr && 420 ireq->loc_addr == laddr && 421 AF_INET_FAMILY(req->rsk_ops->family)) { 422 WARN_ON(req->sk); 423 *prevp = prev; 424 break; 425 } 426 } 427 428 return req; 429} 430 431EXPORT_SYMBOL_GPL(inet_csk_search_req); 432 433void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, 434 unsigned long timeout) 435{ 436 struct inet_connection_sock *icsk = inet_csk(sk); 437 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 438 const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, 439 lopt->hash_rnd, lopt->nr_table_entries); 440 441 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); 442 inet_csk_reqsk_queue_added(sk, timeout); 443} 444 445/* Only thing we need from tcp.h */ 446extern int sysctl_tcp_synack_retries; 447 448EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add); 449 450/* Decide when to expire the request and when to resend SYN-ACK */ 451static inline void syn_ack_recalc(struct request_sock *req, const int thresh, 452 const int max_retries, 453 const u8 rskq_defer_accept, 454 int *expire, int *resend) 455{ 456 if (!rskq_defer_accept) { 457 *expire = req->retrans >= thresh; 458 *resend = 1; 459 return; 460 } 461 *expire = req->retrans >= thresh && 462 (!inet_rsk(req)->acked || req->retrans >= max_retries); 463 /* 464 * Do not resend while waiting for data after ACK, 465 * start to resend on end of deferring period to give 466 * last chance for data or ACK to create established socket. 467 */ 468 *resend = !inet_rsk(req)->acked || 469 req->retrans >= rskq_defer_accept - 1; 470} 471 472void inet_csk_reqsk_queue_prune(struct sock *parent, 473 const unsigned long interval, 474 const unsigned long timeout, 475 const unsigned long max_rto) 476{ 477 struct inet_connection_sock *icsk = inet_csk(parent); 478 struct request_sock_queue *queue = &icsk->icsk_accept_queue; 479 struct listen_sock *lopt = queue->listen_opt; 480 int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries; 481 int thresh = max_retries; 482 unsigned long now = jiffies; 483 struct request_sock **reqp, *req; 484 int i, budget; 485 486 if (lopt == NULL || lopt->qlen == 0) 487 return; 488 489 /* Normally all the openreqs are young and become mature 490 * (i.e. converted to established socket) for first timeout. 491 * If synack was not acknowledged for 3 seconds, it means 492 * one of the following things: synack was lost, ack was lost, 493 * rtt is high or nobody planned to ack (i.e. synflood). 494 * When server is a bit loaded, queue is populated with old 495 * open requests, reducing effective size of queue. 496 * When server is well loaded, queue size reduces to zero 497 * after several minutes of work. It is not synflood, 498 * it is normal operation. The solution is pruning 499 * too old entries overriding normal timeout, when 500 * situation becomes dangerous. 501 * 502 * Essentially, we reserve half of room for young 503 * embrions; and abort old ones without pity, if old 504 * ones are about to clog our table. 505 */ 506 if (lopt->qlen>>(lopt->max_qlen_log-1)) { 507 int young = (lopt->qlen_young<<1); 508 509 while (thresh > 2) { 510 if (lopt->qlen < young) 511 break; 512 thresh--; 513 young <<= 1; 514 } 515 } 516 517 if (queue->rskq_defer_accept) 518 max_retries = queue->rskq_defer_accept; 519 520 budget = 2 * (lopt->nr_table_entries / (timeout / interval)); 521 i = lopt->clock_hand; 522 523 do { 524 reqp=&lopt->syn_table[i]; 525 while ((req = *reqp) != NULL) { 526 if (time_after_eq(now, req->expires)) { 527 int expire = 0, resend = 0; 528 529 syn_ack_recalc(req, thresh, max_retries, 530 queue->rskq_defer_accept, 531 &expire, &resend); 532 if (req->rsk_ops->syn_ack_timeout) 533 req->rsk_ops->syn_ack_timeout(parent, req); 534 if (!expire && 535 (!resend || 536 !req->rsk_ops->rtx_syn_ack(parent, req, NULL) || 537 inet_rsk(req)->acked)) { 538 unsigned long timeo; 539 540 if (req->retrans++ == 0) 541 lopt->qlen_young--; 542 timeo = min((timeout << req->retrans), max_rto); 543 req->expires = now + timeo; 544 reqp = &req->dl_next; 545 continue; 546 } 547 548 /* Drop this request */ 549 inet_csk_reqsk_queue_unlink(parent, req, reqp); 550 reqsk_queue_removed(queue, req); 551 reqsk_free(req); 552 continue; 553 } 554 reqp = &req->dl_next; 555 } 556 557 i = (i + 1) & (lopt->nr_table_entries - 1); 558 559 } while (--budget > 0); 560 561 lopt->clock_hand = i; 562 563 if (lopt->qlen) 564 inet_csk_reset_keepalive_timer(parent, interval); 565} 566 567EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune); 568 569struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req, 570 const gfp_t priority) 571{ 572 struct sock *newsk = sk_clone(sk, priority); 573 574 if (newsk != NULL) { 575 struct inet_connection_sock *newicsk = inet_csk(newsk); 576 577 newsk->sk_state = TCP_SYN_RECV; 578 newicsk->icsk_bind_hash = NULL; 579 580 inet_sk(newsk)->inet_dport = inet_rsk(req)->rmt_port; 581 inet_sk(newsk)->inet_num = ntohs(inet_rsk(req)->loc_port); 582 inet_sk(newsk)->inet_sport = inet_rsk(req)->loc_port; 583 newsk->sk_write_space = sk_stream_write_space; 584 585 newicsk->icsk_retransmits = 0; 586 newicsk->icsk_backoff = 0; 587 newicsk->icsk_probes_out = 0; 588 589 /* Deinitialize accept_queue to trap illegal accesses. */ 590 memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue)); 591 592 security_inet_csk_clone(newsk, req); 593 } 594 return newsk; 595} 596 597EXPORT_SYMBOL_GPL(inet_csk_clone); 598 599/* 600 * At this point, there should be no process reference to this 601 * socket, and thus no user references at all. Therefore we 602 * can assume the socket waitqueue is inactive and nobody will 603 * try to jump onto it. 604 */ 605void inet_csk_destroy_sock(struct sock *sk) 606{ 607 WARN_ON(sk->sk_state != TCP_CLOSE); 608 WARN_ON(!sock_flag(sk, SOCK_DEAD)); 609 610 /* It cannot be in hash table! */ 611 WARN_ON(!sk_unhashed(sk)); 612 613 /* If it has not 0 inet_sk(sk)->inet_num, it must be bound */ 614 WARN_ON(inet_sk(sk)->inet_num && !inet_csk(sk)->icsk_bind_hash); 615 616 sk->sk_prot->destroy(sk); 617 618 sk_stream_kill_queues(sk); 619 620 xfrm_sk_free_policy(sk); 621 622 sk_refcnt_debug_release(sk); 623 624 percpu_counter_dec(sk->sk_prot->orphan_count); 625 sock_put(sk); 626} 627 628EXPORT_SYMBOL(inet_csk_destroy_sock); 629 630int inet_csk_listen_start(struct sock *sk, const int nr_table_entries) 631{ 632 struct inet_sock *inet = inet_sk(sk); 633 struct inet_connection_sock *icsk = inet_csk(sk); 634 int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries); 635 636 if (rc != 0) 637 return rc; 638 639 sk->sk_max_ack_backlog = 0; 640 sk->sk_ack_backlog = 0; 641 inet_csk_delack_init(sk); 642 643 /* There is race window here: we announce ourselves listening, 644 * but this transition is still not validated by get_port(). 645 * It is OK, because this socket enters to hash table only 646 * after validation is complete. 647 */ 648 sk->sk_state = TCP_LISTEN; 649 if (!sk->sk_prot->get_port(sk, inet->inet_num)) { 650 inet->inet_sport = htons(inet->inet_num); 651 652 sk_dst_reset(sk); 653 sk->sk_prot->hash(sk); 654 655 return 0; 656 } 657 658 sk->sk_state = TCP_CLOSE; 659 __reqsk_queue_destroy(&icsk->icsk_accept_queue); 660 return -EADDRINUSE; 661} 662 663EXPORT_SYMBOL_GPL(inet_csk_listen_start); 664 665/* 666 * This routine closes sockets which have been at least partially 667 * opened, but not yet accepted. 668 */ 669void inet_csk_listen_stop(struct sock *sk) 670{ 671 struct inet_connection_sock *icsk = inet_csk(sk); 672 struct request_sock *acc_req; 673 struct request_sock *req; 674 675 inet_csk_delete_keepalive_timer(sk); 676 677 /* make all the listen_opt local to us */ 678 acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue); 679 680 /* Following specs, it would be better either to send FIN 681 * (and enter FIN-WAIT-1, it is normal close) 682 * or to send active reset (abort). 683 * Certainly, it is pretty dangerous while synflood, but it is 684 * bad justification for our negligence 8) 685 * To be honest, we are not able to make either 686 * of the variants now. --ANK 687 */ 688 reqsk_queue_destroy(&icsk->icsk_accept_queue); 689 690 while ((req = acc_req) != NULL) { 691 struct sock *child = req->sk; 692 693 acc_req = req->dl_next; 694 695 local_bh_disable(); 696 bh_lock_sock(child); 697 WARN_ON(sock_owned_by_user(child)); 698 sock_hold(child); 699 700 sk->sk_prot->disconnect(child, O_NONBLOCK); 701 702 sock_orphan(child); 703 704 percpu_counter_inc(sk->sk_prot->orphan_count); 705 706 inet_csk_destroy_sock(child); 707 708 bh_unlock_sock(child); 709 local_bh_enable(); 710 sock_put(child); 711 712 sk_acceptq_removed(sk); 713 __reqsk_free(req); 714 } 715 WARN_ON(sk->sk_ack_backlog); 716} 717 718EXPORT_SYMBOL_GPL(inet_csk_listen_stop); 719 720void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) 721{ 722 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 723 const struct inet_sock *inet = inet_sk(sk); 724 725 sin->sin_family = AF_INET; 726 sin->sin_addr.s_addr = inet->inet_daddr; 727 sin->sin_port = inet->inet_dport; 728} 729 730EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr); 731 732#ifdef CONFIG_COMPAT 733int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, 734 char __user *optval, int __user *optlen) 735{ 736 const struct inet_connection_sock *icsk = inet_csk(sk); 737 738 if (icsk->icsk_af_ops->compat_getsockopt != NULL) 739 return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname, 740 optval, optlen); 741 return icsk->icsk_af_ops->getsockopt(sk, level, optname, 742 optval, optlen); 743} 744 745EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt); 746 747int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, 748 char __user *optval, unsigned int optlen) 749{ 750 const struct inet_connection_sock *icsk = inet_csk(sk); 751 752 if (icsk->icsk_af_ops->compat_setsockopt != NULL) 753 return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname, 754 optval, optlen); 755 return icsk->icsk_af_ops->setsockopt(sk, level, optname, 756 optval, optlen); 757} 758 759EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt); 760#endif 761