inet_connection_sock.c revision 82103232edc4b4ed48949a195aca93cfa3fe3fa8
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 * For high-usage systems, use sysctl to change this to 35 * 32768-61000 36 */ 37int sysctl_local_port_range[2] = { 1024, 4999 }; 38 39int inet_csk_bind_conflict(const struct sock *sk, 40 const struct inet_bind_bucket *tb) 41{ 42 const __be32 sk_rcv_saddr = inet_rcv_saddr(sk); 43 struct sock *sk2; 44 struct hlist_node *node; 45 int reuse = sk->sk_reuse; 46 47 sk_for_each_bound(sk2, node, &tb->owners) { 48 if (sk != sk2 && 49 !inet_v6_ipv6only(sk2) && 50 (!sk->sk_bound_dev_if || 51 !sk2->sk_bound_dev_if || 52 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { 53 if (!reuse || !sk2->sk_reuse || 54 sk2->sk_state == TCP_LISTEN) { 55 const __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 56 if (!sk2_rcv_saddr || !sk_rcv_saddr || 57 sk2_rcv_saddr == sk_rcv_saddr) 58 break; 59 } 60 } 61 } 62 return node != NULL; 63} 64 65EXPORT_SYMBOL_GPL(inet_csk_bind_conflict); 66 67/* Obtain a reference to a local port for the given sock, 68 * if snum is zero it means select any available local port. 69 */ 70int inet_csk_get_port(struct inet_hashinfo *hashinfo, 71 struct sock *sk, unsigned short snum, 72 int (*bind_conflict)(const struct sock *sk, 73 const struct inet_bind_bucket *tb)) 74{ 75 struct inet_bind_hashbucket *head; 76 struct hlist_node *node; 77 struct inet_bind_bucket *tb; 78 int ret; 79 80 local_bh_disable(); 81 if (!snum) { 82 int low = sysctl_local_port_range[0]; 83 int high = sysctl_local_port_range[1]; 84 int remaining = (high - low) + 1; 85 int rover = net_random() % (high - low) + low; 86 87 do { 88 head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)]; 89 spin_lock(&head->lock); 90 inet_bind_bucket_for_each(tb, node, &head->chain) 91 if (tb->port == rover) 92 goto next; 93 break; 94 next: 95 spin_unlock(&head->lock); 96 if (++rover > high) 97 rover = low; 98 } while (--remaining > 0); 99 100 /* Exhausted local port range during search? It is not 101 * possible for us to be holding one of the bind hash 102 * locks if this test triggers, because if 'remaining' 103 * drops to zero, we broke out of the do/while loop at 104 * the top level, not from the 'break;' statement. 105 */ 106 ret = 1; 107 if (remaining <= 0) 108 goto fail; 109 110 /* OK, here is the one we will use. HEAD is 111 * non-NULL and we hold it's mutex. 112 */ 113 snum = rover; 114 } else { 115 head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)]; 116 spin_lock(&head->lock); 117 inet_bind_bucket_for_each(tb, node, &head->chain) 118 if (tb->port == snum) 119 goto tb_found; 120 } 121 tb = NULL; 122 goto tb_not_found; 123tb_found: 124 if (!hlist_empty(&tb->owners)) { 125 if (sk->sk_reuse > 1) 126 goto success; 127 if (tb->fastreuse > 0 && 128 sk->sk_reuse && sk->sk_state != TCP_LISTEN) { 129 goto success; 130 } else { 131 ret = 1; 132 if (bind_conflict(sk, tb)) 133 goto fail_unlock; 134 } 135 } 136tb_not_found: 137 ret = 1; 138 if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL) 139 goto fail_unlock; 140 if (hlist_empty(&tb->owners)) { 141 if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) 142 tb->fastreuse = 1; 143 else 144 tb->fastreuse = 0; 145 } else if (tb->fastreuse && 146 (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) 147 tb->fastreuse = 0; 148success: 149 if (!inet_csk(sk)->icsk_bind_hash) 150 inet_bind_hash(sk, tb, snum); 151 BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb); 152 ret = 0; 153 154fail_unlock: 155 spin_unlock(&head->lock); 156fail: 157 local_bh_enable(); 158 return ret; 159} 160 161EXPORT_SYMBOL_GPL(inet_csk_get_port); 162 163/* 164 * Wait for an incoming connection, avoid race conditions. This must be called 165 * with the socket locked. 166 */ 167static int inet_csk_wait_for_connect(struct sock *sk, long timeo) 168{ 169 struct inet_connection_sock *icsk = inet_csk(sk); 170 DEFINE_WAIT(wait); 171 int err; 172 173 /* 174 * True wake-one mechanism for incoming connections: only 175 * one process gets woken up, not the 'whole herd'. 176 * Since we do not 'race & poll' for established sockets 177 * anymore, the common case will execute the loop only once. 178 * 179 * Subtle issue: "add_wait_queue_exclusive()" will be added 180 * after any current non-exclusive waiters, and we know that 181 * it will always _stay_ after any new non-exclusive waiters 182 * because all non-exclusive waiters are added at the 183 * beginning of the wait-queue. As such, it's ok to "drop" 184 * our exclusiveness temporarily when we get woken up without 185 * having to remove and re-insert us on the wait queue. 186 */ 187 for (;;) { 188 prepare_to_wait_exclusive(sk->sk_sleep, &wait, 189 TASK_INTERRUPTIBLE); 190 release_sock(sk); 191 if (reqsk_queue_empty(&icsk->icsk_accept_queue)) 192 timeo = schedule_timeout(timeo); 193 lock_sock(sk); 194 err = 0; 195 if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) 196 break; 197 err = -EINVAL; 198 if (sk->sk_state != TCP_LISTEN) 199 break; 200 err = sock_intr_errno(timeo); 201 if (signal_pending(current)) 202 break; 203 err = -EAGAIN; 204 if (!timeo) 205 break; 206 } 207 finish_wait(sk->sk_sleep, &wait); 208 return err; 209} 210 211/* 212 * This will accept the next outstanding connection. 213 */ 214struct sock *inet_csk_accept(struct sock *sk, int flags, int *err) 215{ 216 struct inet_connection_sock *icsk = inet_csk(sk); 217 struct sock *newsk; 218 int error; 219 220 lock_sock(sk); 221 222 /* We need to make sure that this socket is listening, 223 * and that it has something pending. 224 */ 225 error = -EINVAL; 226 if (sk->sk_state != TCP_LISTEN) 227 goto out_err; 228 229 /* Find already established connection */ 230 if (reqsk_queue_empty(&icsk->icsk_accept_queue)) { 231 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 232 233 /* If this is a non blocking socket don't sleep */ 234 error = -EAGAIN; 235 if (!timeo) 236 goto out_err; 237 238 error = inet_csk_wait_for_connect(sk, timeo); 239 if (error) 240 goto out_err; 241 } 242 243 newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk); 244 BUG_TRAP(newsk->sk_state != TCP_SYN_RECV); 245out: 246 release_sock(sk); 247 return newsk; 248out_err: 249 newsk = NULL; 250 *err = error; 251 goto out; 252} 253 254EXPORT_SYMBOL(inet_csk_accept); 255 256/* 257 * Using different timers for retransmit, delayed acks and probes 258 * We may wish use just one timer maintaining a list of expire jiffies 259 * to optimize. 260 */ 261void inet_csk_init_xmit_timers(struct sock *sk, 262 void (*retransmit_handler)(unsigned long), 263 void (*delack_handler)(unsigned long), 264 void (*keepalive_handler)(unsigned long)) 265{ 266 struct inet_connection_sock *icsk = inet_csk(sk); 267 268 init_timer(&icsk->icsk_retransmit_timer); 269 init_timer(&icsk->icsk_delack_timer); 270 init_timer(&sk->sk_timer); 271 272 icsk->icsk_retransmit_timer.function = retransmit_handler; 273 icsk->icsk_delack_timer.function = delack_handler; 274 sk->sk_timer.function = keepalive_handler; 275 276 icsk->icsk_retransmit_timer.data = 277 icsk->icsk_delack_timer.data = 278 sk->sk_timer.data = (unsigned long)sk; 279 280 icsk->icsk_pending = icsk->icsk_ack.pending = 0; 281} 282 283EXPORT_SYMBOL(inet_csk_init_xmit_timers); 284 285void inet_csk_clear_xmit_timers(struct sock *sk) 286{ 287 struct inet_connection_sock *icsk = inet_csk(sk); 288 289 icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0; 290 291 sk_stop_timer(sk, &icsk->icsk_retransmit_timer); 292 sk_stop_timer(sk, &icsk->icsk_delack_timer); 293 sk_stop_timer(sk, &sk->sk_timer); 294} 295 296EXPORT_SYMBOL(inet_csk_clear_xmit_timers); 297 298void inet_csk_delete_keepalive_timer(struct sock *sk) 299{ 300 sk_stop_timer(sk, &sk->sk_timer); 301} 302 303EXPORT_SYMBOL(inet_csk_delete_keepalive_timer); 304 305void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len) 306{ 307 sk_reset_timer(sk, &sk->sk_timer, jiffies + len); 308} 309 310EXPORT_SYMBOL(inet_csk_reset_keepalive_timer); 311 312struct dst_entry* inet_csk_route_req(struct sock *sk, 313 const struct request_sock *req) 314{ 315 struct rtable *rt; 316 const struct inet_request_sock *ireq = inet_rsk(req); 317 struct ip_options *opt = inet_rsk(req)->opt; 318 struct flowi fl = { .oif = sk->sk_bound_dev_if, 319 .nl_u = { .ip4_u = 320 { .daddr = ((opt && opt->srr) ? 321 opt->faddr : 322 ireq->rmt_addr), 323 .saddr = ireq->loc_addr, 324 .tos = RT_CONN_FLAGS(sk) } }, 325 .proto = sk->sk_protocol, 326 .uli_u = { .ports = 327 { .sport = inet_sk(sk)->sport, 328 .dport = ireq->rmt_port } } }; 329 330 security_req_classify_flow(req, &fl); 331 if (ip_route_output_flow(&rt, &fl, sk, 0)) { 332 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); 333 return NULL; 334 } 335 if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) { 336 ip_rt_put(rt); 337 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); 338 return NULL; 339 } 340 return &rt->u.dst; 341} 342 343EXPORT_SYMBOL_GPL(inet_csk_route_req); 344 345static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport, 346 const u32 rnd, const u16 synq_hsize) 347{ 348 return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1); 349} 350 351#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 352#define AF_INET_FAMILY(fam) ((fam) == AF_INET) 353#else 354#define AF_INET_FAMILY(fam) 1 355#endif 356 357struct request_sock *inet_csk_search_req(const struct sock *sk, 358 struct request_sock ***prevp, 359 const __be16 rport, const __be32 raddr, 360 const __be32 laddr) 361{ 362 const struct inet_connection_sock *icsk = inet_csk(sk); 363 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 364 struct request_sock *req, **prev; 365 366 for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd, 367 lopt->nr_table_entries)]; 368 (req = *prev) != NULL; 369 prev = &req->dl_next) { 370 const struct inet_request_sock *ireq = inet_rsk(req); 371 372 if (ireq->rmt_port == rport && 373 ireq->rmt_addr == raddr && 374 ireq->loc_addr == laddr && 375 AF_INET_FAMILY(req->rsk_ops->family)) { 376 BUG_TRAP(!req->sk); 377 *prevp = prev; 378 break; 379 } 380 } 381 382 return req; 383} 384 385EXPORT_SYMBOL_GPL(inet_csk_search_req); 386 387void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, 388 unsigned long timeout) 389{ 390 struct inet_connection_sock *icsk = inet_csk(sk); 391 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 392 const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, 393 lopt->hash_rnd, lopt->nr_table_entries); 394 395 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); 396 inet_csk_reqsk_queue_added(sk, timeout); 397} 398 399/* Only thing we need from tcp.h */ 400extern int sysctl_tcp_synack_retries; 401 402EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add); 403 404void inet_csk_reqsk_queue_prune(struct sock *parent, 405 const unsigned long interval, 406 const unsigned long timeout, 407 const unsigned long max_rto) 408{ 409 struct inet_connection_sock *icsk = inet_csk(parent); 410 struct request_sock_queue *queue = &icsk->icsk_accept_queue; 411 struct listen_sock *lopt = queue->listen_opt; 412 int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries; 413 int thresh = max_retries; 414 unsigned long now = jiffies; 415 struct request_sock **reqp, *req; 416 int i, budget; 417 418 if (lopt == NULL || lopt->qlen == 0) 419 return; 420 421 /* Normally all the openreqs are young and become mature 422 * (i.e. converted to established socket) for first timeout. 423 * If synack was not acknowledged for 3 seconds, it means 424 * one of the following things: synack was lost, ack was lost, 425 * rtt is high or nobody planned to ack (i.e. synflood). 426 * When server is a bit loaded, queue is populated with old 427 * open requests, reducing effective size of queue. 428 * When server is well loaded, queue size reduces to zero 429 * after several minutes of work. It is not synflood, 430 * it is normal operation. The solution is pruning 431 * too old entries overriding normal timeout, when 432 * situation becomes dangerous. 433 * 434 * Essentially, we reserve half of room for young 435 * embrions; and abort old ones without pity, if old 436 * ones are about to clog our table. 437 */ 438 if (lopt->qlen>>(lopt->max_qlen_log-1)) { 439 int young = (lopt->qlen_young<<1); 440 441 while (thresh > 2) { 442 if (lopt->qlen < young) 443 break; 444 thresh--; 445 young <<= 1; 446 } 447 } 448 449 if (queue->rskq_defer_accept) 450 max_retries = queue->rskq_defer_accept; 451 452 budget = 2 * (lopt->nr_table_entries / (timeout / interval)); 453 i = lopt->clock_hand; 454 455 do { 456 reqp=&lopt->syn_table[i]; 457 while ((req = *reqp) != NULL) { 458 if (time_after_eq(now, req->expires)) { 459 if ((req->retrans < thresh || 460 (inet_rsk(req)->acked && req->retrans < max_retries)) 461 && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) { 462 unsigned long timeo; 463 464 if (req->retrans++ == 0) 465 lopt->qlen_young--; 466 timeo = min((timeout << req->retrans), max_rto); 467 req->expires = now + timeo; 468 reqp = &req->dl_next; 469 continue; 470 } 471 472 /* Drop this request */ 473 inet_csk_reqsk_queue_unlink(parent, req, reqp); 474 reqsk_queue_removed(queue, req); 475 reqsk_free(req); 476 continue; 477 } 478 reqp = &req->dl_next; 479 } 480 481 i = (i + 1) & (lopt->nr_table_entries - 1); 482 483 } while (--budget > 0); 484 485 lopt->clock_hand = i; 486 487 if (lopt->qlen) 488 inet_csk_reset_keepalive_timer(parent, interval); 489} 490 491EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune); 492 493struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req, 494 const gfp_t priority) 495{ 496 struct sock *newsk = sk_clone(sk, priority); 497 498 if (newsk != NULL) { 499 struct inet_connection_sock *newicsk = inet_csk(newsk); 500 501 newsk->sk_state = TCP_SYN_RECV; 502 newicsk->icsk_bind_hash = NULL; 503 504 inet_sk(newsk)->dport = inet_rsk(req)->rmt_port; 505 newsk->sk_write_space = sk_stream_write_space; 506 507 newicsk->icsk_retransmits = 0; 508 newicsk->icsk_backoff = 0; 509 newicsk->icsk_probes_out = 0; 510 511 /* Deinitialize accept_queue to trap illegal accesses. */ 512 memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue)); 513 514 security_inet_csk_clone(newsk, req); 515 } 516 return newsk; 517} 518 519EXPORT_SYMBOL_GPL(inet_csk_clone); 520 521/* 522 * At this point, there should be no process reference to this 523 * socket, and thus no user references at all. Therefore we 524 * can assume the socket waitqueue is inactive and nobody will 525 * try to jump onto it. 526 */ 527void inet_csk_destroy_sock(struct sock *sk) 528{ 529 BUG_TRAP(sk->sk_state == TCP_CLOSE); 530 BUG_TRAP(sock_flag(sk, SOCK_DEAD)); 531 532 /* It cannot be in hash table! */ 533 BUG_TRAP(sk_unhashed(sk)); 534 535 /* If it has not 0 inet_sk(sk)->num, it must be bound */ 536 BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash); 537 538 sk->sk_prot->destroy(sk); 539 540 sk_stream_kill_queues(sk); 541 542 xfrm_sk_free_policy(sk); 543 544 sk_refcnt_debug_release(sk); 545 546 atomic_dec(sk->sk_prot->orphan_count); 547 sock_put(sk); 548} 549 550EXPORT_SYMBOL(inet_csk_destroy_sock); 551 552int inet_csk_listen_start(struct sock *sk, const int nr_table_entries) 553{ 554 struct inet_sock *inet = inet_sk(sk); 555 struct inet_connection_sock *icsk = inet_csk(sk); 556 int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries); 557 558 if (rc != 0) 559 return rc; 560 561 sk->sk_max_ack_backlog = 0; 562 sk->sk_ack_backlog = 0; 563 inet_csk_delack_init(sk); 564 565 /* There is race window here: we announce ourselves listening, 566 * but this transition is still not validated by get_port(). 567 * It is OK, because this socket enters to hash table only 568 * after validation is complete. 569 */ 570 sk->sk_state = TCP_LISTEN; 571 if (!sk->sk_prot->get_port(sk, inet->num)) { 572 inet->sport = htons(inet->num); 573 574 sk_dst_reset(sk); 575 sk->sk_prot->hash(sk); 576 577 return 0; 578 } 579 580 sk->sk_state = TCP_CLOSE; 581 __reqsk_queue_destroy(&icsk->icsk_accept_queue); 582 return -EADDRINUSE; 583} 584 585EXPORT_SYMBOL_GPL(inet_csk_listen_start); 586 587/* 588 * This routine closes sockets which have been at least partially 589 * opened, but not yet accepted. 590 */ 591void inet_csk_listen_stop(struct sock *sk) 592{ 593 struct inet_connection_sock *icsk = inet_csk(sk); 594 struct request_sock *acc_req; 595 struct request_sock *req; 596 597 inet_csk_delete_keepalive_timer(sk); 598 599 /* make all the listen_opt local to us */ 600 acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue); 601 602 /* Following specs, it would be better either to send FIN 603 * (and enter FIN-WAIT-1, it is normal close) 604 * or to send active reset (abort). 605 * Certainly, it is pretty dangerous while synflood, but it is 606 * bad justification for our negligence 8) 607 * To be honest, we are not able to make either 608 * of the variants now. --ANK 609 */ 610 reqsk_queue_destroy(&icsk->icsk_accept_queue); 611 612 while ((req = acc_req) != NULL) { 613 struct sock *child = req->sk; 614 615 acc_req = req->dl_next; 616 617 local_bh_disable(); 618 bh_lock_sock(child); 619 BUG_TRAP(!sock_owned_by_user(child)); 620 sock_hold(child); 621 622 sk->sk_prot->disconnect(child, O_NONBLOCK); 623 624 sock_orphan(child); 625 626 atomic_inc(sk->sk_prot->orphan_count); 627 628 inet_csk_destroy_sock(child); 629 630 bh_unlock_sock(child); 631 local_bh_enable(); 632 sock_put(child); 633 634 sk_acceptq_removed(sk); 635 __reqsk_free(req); 636 } 637 BUG_TRAP(!sk->sk_ack_backlog); 638} 639 640EXPORT_SYMBOL_GPL(inet_csk_listen_stop); 641 642void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) 643{ 644 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 645 const struct inet_sock *inet = inet_sk(sk); 646 647 sin->sin_family = AF_INET; 648 sin->sin_addr.s_addr = inet->daddr; 649 sin->sin_port = inet->dport; 650} 651 652EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr); 653 654int inet_csk_ctl_sock_create(struct socket **sock, unsigned short family, 655 unsigned short type, unsigned char protocol) 656{ 657 int rc = sock_create_kern(family, type, protocol, sock); 658 659 if (rc == 0) { 660 (*sock)->sk->sk_allocation = GFP_ATOMIC; 661 inet_sk((*sock)->sk)->uc_ttl = -1; 662 /* 663 * Unhash it so that IP input processing does not even see it, 664 * we do not wish this socket to see incoming packets. 665 */ 666 (*sock)->sk->sk_prot->unhash((*sock)->sk); 667 } 668 return rc; 669} 670 671EXPORT_SYMBOL_GPL(inet_csk_ctl_sock_create); 672 673#ifdef CONFIG_COMPAT 674int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, 675 char __user *optval, int __user *optlen) 676{ 677 const struct inet_connection_sock *icsk = inet_csk(sk); 678 679 if (icsk->icsk_af_ops->compat_getsockopt != NULL) 680 return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname, 681 optval, optlen); 682 return icsk->icsk_af_ops->getsockopt(sk, level, optname, 683 optval, optlen); 684} 685 686EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt); 687 688int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, 689 char __user *optval, int optlen) 690{ 691 const struct inet_connection_sock *icsk = inet_csk(sk); 692 693 if (icsk->icsk_af_ops->compat_setsockopt != NULL) 694 return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname, 695 optval, optlen); 696 return icsk->icsk_af_ops->setsockopt(sk, level, optname, 697 optval, optlen); 698} 699 700EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt); 701#endif 702