inet_connection_sock.c revision b24b8a247ff65c01b252025926fe564209fae4fc
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 sk_for_each_bound(sk2, node, &tb->owners) { 59 if (sk != sk2 && 60 !inet_v6_ipv6only(sk2) && 61 (!sk->sk_bound_dev_if || 62 !sk2->sk_bound_dev_if || 63 sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { 64 if (!reuse || !sk2->sk_reuse || 65 sk2->sk_state == TCP_LISTEN) { 66 const __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); 67 if (!sk2_rcv_saddr || !sk_rcv_saddr || 68 sk2_rcv_saddr == sk_rcv_saddr) 69 break; 70 } 71 } 72 } 73 return node != NULL; 74} 75 76EXPORT_SYMBOL_GPL(inet_csk_bind_conflict); 77 78/* Obtain a reference to a local port for the given sock, 79 * if snum is zero it means select any available local port. 80 */ 81int inet_csk_get_port(struct inet_hashinfo *hashinfo, 82 struct sock *sk, unsigned short snum, 83 int (*bind_conflict)(const struct sock *sk, 84 const struct inet_bind_bucket *tb)) 85{ 86 struct inet_bind_hashbucket *head; 87 struct hlist_node *node; 88 struct inet_bind_bucket *tb; 89 int ret; 90 91 local_bh_disable(); 92 if (!snum) { 93 int remaining, rover, low, high; 94 95 inet_get_local_port_range(&low, &high); 96 remaining = (high - low) + 1; 97 rover = net_random() % remaining + low; 98 99 do { 100 head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)]; 101 spin_lock(&head->lock); 102 inet_bind_bucket_for_each(tb, node, &head->chain) 103 if (tb->port == rover) 104 goto next; 105 break; 106 next: 107 spin_unlock(&head->lock); 108 if (++rover > high) 109 rover = low; 110 } while (--remaining > 0); 111 112 /* Exhausted local port range during search? It is not 113 * possible for us to be holding one of the bind hash 114 * locks if this test triggers, because if 'remaining' 115 * drops to zero, we broke out of the do/while loop at 116 * the top level, not from the 'break;' statement. 117 */ 118 ret = 1; 119 if (remaining <= 0) 120 goto fail; 121 122 /* OK, here is the one we will use. HEAD is 123 * non-NULL and we hold it's mutex. 124 */ 125 snum = rover; 126 } else { 127 head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)]; 128 spin_lock(&head->lock); 129 inet_bind_bucket_for_each(tb, node, &head->chain) 130 if (tb->port == snum) 131 goto tb_found; 132 } 133 tb = NULL; 134 goto tb_not_found; 135tb_found: 136 if (!hlist_empty(&tb->owners)) { 137 if (sk->sk_reuse > 1) 138 goto success; 139 if (tb->fastreuse > 0 && 140 sk->sk_reuse && sk->sk_state != TCP_LISTEN) { 141 goto success; 142 } else { 143 ret = 1; 144 if (bind_conflict(sk, tb)) 145 goto fail_unlock; 146 } 147 } 148tb_not_found: 149 ret = 1; 150 if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, head, snum)) == NULL) 151 goto fail_unlock; 152 if (hlist_empty(&tb->owners)) { 153 if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) 154 tb->fastreuse = 1; 155 else 156 tb->fastreuse = 0; 157 } else if (tb->fastreuse && 158 (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) 159 tb->fastreuse = 0; 160success: 161 if (!inet_csk(sk)->icsk_bind_hash) 162 inet_bind_hash(sk, tb, snum); 163 BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb); 164 ret = 0; 165 166fail_unlock: 167 spin_unlock(&head->lock); 168fail: 169 local_bh_enable(); 170 return ret; 171} 172 173EXPORT_SYMBOL_GPL(inet_csk_get_port); 174 175/* 176 * Wait for an incoming connection, avoid race conditions. This must be called 177 * with the socket locked. 178 */ 179static int inet_csk_wait_for_connect(struct sock *sk, long timeo) 180{ 181 struct inet_connection_sock *icsk = inet_csk(sk); 182 DEFINE_WAIT(wait); 183 int err; 184 185 /* 186 * True wake-one mechanism for incoming connections: only 187 * one process gets woken up, not the 'whole herd'. 188 * Since we do not 'race & poll' for established sockets 189 * anymore, the common case will execute the loop only once. 190 * 191 * Subtle issue: "add_wait_queue_exclusive()" will be added 192 * after any current non-exclusive waiters, and we know that 193 * it will always _stay_ after any new non-exclusive waiters 194 * because all non-exclusive waiters are added at the 195 * beginning of the wait-queue. As such, it's ok to "drop" 196 * our exclusiveness temporarily when we get woken up without 197 * having to remove and re-insert us on the wait queue. 198 */ 199 for (;;) { 200 prepare_to_wait_exclusive(sk->sk_sleep, &wait, 201 TASK_INTERRUPTIBLE); 202 release_sock(sk); 203 if (reqsk_queue_empty(&icsk->icsk_accept_queue)) 204 timeo = schedule_timeout(timeo); 205 lock_sock(sk); 206 err = 0; 207 if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) 208 break; 209 err = -EINVAL; 210 if (sk->sk_state != TCP_LISTEN) 211 break; 212 err = sock_intr_errno(timeo); 213 if (signal_pending(current)) 214 break; 215 err = -EAGAIN; 216 if (!timeo) 217 break; 218 } 219 finish_wait(sk->sk_sleep, &wait); 220 return err; 221} 222 223/* 224 * This will accept the next outstanding connection. 225 */ 226struct sock *inet_csk_accept(struct sock *sk, int flags, int *err) 227{ 228 struct inet_connection_sock *icsk = inet_csk(sk); 229 struct sock *newsk; 230 int error; 231 232 lock_sock(sk); 233 234 /* We need to make sure that this socket is listening, 235 * and that it has something pending. 236 */ 237 error = -EINVAL; 238 if (sk->sk_state != TCP_LISTEN) 239 goto out_err; 240 241 /* Find already established connection */ 242 if (reqsk_queue_empty(&icsk->icsk_accept_queue)) { 243 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 244 245 /* If this is a non blocking socket don't sleep */ 246 error = -EAGAIN; 247 if (!timeo) 248 goto out_err; 249 250 error = inet_csk_wait_for_connect(sk, timeo); 251 if (error) 252 goto out_err; 253 } 254 255 newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk); 256 BUG_TRAP(newsk->sk_state != TCP_SYN_RECV); 257out: 258 release_sock(sk); 259 return newsk; 260out_err: 261 newsk = NULL; 262 *err = error; 263 goto out; 264} 265 266EXPORT_SYMBOL(inet_csk_accept); 267 268/* 269 * Using different timers for retransmit, delayed acks and probes 270 * We may wish use just one timer maintaining a list of expire jiffies 271 * to optimize. 272 */ 273void inet_csk_init_xmit_timers(struct sock *sk, 274 void (*retransmit_handler)(unsigned long), 275 void (*delack_handler)(unsigned long), 276 void (*keepalive_handler)(unsigned long)) 277{ 278 struct inet_connection_sock *icsk = inet_csk(sk); 279 280 setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler, 281 (unsigned long)sk); 282 setup_timer(&icsk->icsk_delack_timer, delack_handler, 283 (unsigned long)sk); 284 setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk); 285 icsk->icsk_pending = icsk->icsk_ack.pending = 0; 286} 287 288EXPORT_SYMBOL(inet_csk_init_xmit_timers); 289 290void inet_csk_clear_xmit_timers(struct sock *sk) 291{ 292 struct inet_connection_sock *icsk = inet_csk(sk); 293 294 icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0; 295 296 sk_stop_timer(sk, &icsk->icsk_retransmit_timer); 297 sk_stop_timer(sk, &icsk->icsk_delack_timer); 298 sk_stop_timer(sk, &sk->sk_timer); 299} 300 301EXPORT_SYMBOL(inet_csk_clear_xmit_timers); 302 303void inet_csk_delete_keepalive_timer(struct sock *sk) 304{ 305 sk_stop_timer(sk, &sk->sk_timer); 306} 307 308EXPORT_SYMBOL(inet_csk_delete_keepalive_timer); 309 310void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len) 311{ 312 sk_reset_timer(sk, &sk->sk_timer, jiffies + len); 313} 314 315EXPORT_SYMBOL(inet_csk_reset_keepalive_timer); 316 317struct dst_entry* inet_csk_route_req(struct sock *sk, 318 const struct request_sock *req) 319{ 320 struct rtable *rt; 321 const struct inet_request_sock *ireq = inet_rsk(req); 322 struct ip_options *opt = inet_rsk(req)->opt; 323 struct flowi fl = { .oif = sk->sk_bound_dev_if, 324 .nl_u = { .ip4_u = 325 { .daddr = ((opt && opt->srr) ? 326 opt->faddr : 327 ireq->rmt_addr), 328 .saddr = ireq->loc_addr, 329 .tos = RT_CONN_FLAGS(sk) } }, 330 .proto = sk->sk_protocol, 331 .uli_u = { .ports = 332 { .sport = inet_sk(sk)->sport, 333 .dport = ireq->rmt_port } } }; 334 335 security_req_classify_flow(req, &fl); 336 if (ip_route_output_flow(&rt, &fl, sk, 0)) { 337 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); 338 return NULL; 339 } 340 if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) { 341 ip_rt_put(rt); 342 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); 343 return NULL; 344 } 345 return &rt->u.dst; 346} 347 348EXPORT_SYMBOL_GPL(inet_csk_route_req); 349 350static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport, 351 const u32 rnd, const u32 synq_hsize) 352{ 353 return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1); 354} 355 356#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 357#define AF_INET_FAMILY(fam) ((fam) == AF_INET) 358#else 359#define AF_INET_FAMILY(fam) 1 360#endif 361 362struct request_sock *inet_csk_search_req(const struct sock *sk, 363 struct request_sock ***prevp, 364 const __be16 rport, const __be32 raddr, 365 const __be32 laddr) 366{ 367 const struct inet_connection_sock *icsk = inet_csk(sk); 368 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 369 struct request_sock *req, **prev; 370 371 for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd, 372 lopt->nr_table_entries)]; 373 (req = *prev) != NULL; 374 prev = &req->dl_next) { 375 const struct inet_request_sock *ireq = inet_rsk(req); 376 377 if (ireq->rmt_port == rport && 378 ireq->rmt_addr == raddr && 379 ireq->loc_addr == laddr && 380 AF_INET_FAMILY(req->rsk_ops->family)) { 381 BUG_TRAP(!req->sk); 382 *prevp = prev; 383 break; 384 } 385 } 386 387 return req; 388} 389 390EXPORT_SYMBOL_GPL(inet_csk_search_req); 391 392void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, 393 unsigned long timeout) 394{ 395 struct inet_connection_sock *icsk = inet_csk(sk); 396 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 397 const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, 398 lopt->hash_rnd, lopt->nr_table_entries); 399 400 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); 401 inet_csk_reqsk_queue_added(sk, timeout); 402} 403 404/* Only thing we need from tcp.h */ 405extern int sysctl_tcp_synack_retries; 406 407EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add); 408 409void inet_csk_reqsk_queue_prune(struct sock *parent, 410 const unsigned long interval, 411 const unsigned long timeout, 412 const unsigned long max_rto) 413{ 414 struct inet_connection_sock *icsk = inet_csk(parent); 415 struct request_sock_queue *queue = &icsk->icsk_accept_queue; 416 struct listen_sock *lopt = queue->listen_opt; 417 int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries; 418 int thresh = max_retries; 419 unsigned long now = jiffies; 420 struct request_sock **reqp, *req; 421 int i, budget; 422 423 if (lopt == NULL || lopt->qlen == 0) 424 return; 425 426 /* Normally all the openreqs are young and become mature 427 * (i.e. converted to established socket) for first timeout. 428 * If synack was not acknowledged for 3 seconds, it means 429 * one of the following things: synack was lost, ack was lost, 430 * rtt is high or nobody planned to ack (i.e. synflood). 431 * When server is a bit loaded, queue is populated with old 432 * open requests, reducing effective size of queue. 433 * When server is well loaded, queue size reduces to zero 434 * after several minutes of work. It is not synflood, 435 * it is normal operation. The solution is pruning 436 * too old entries overriding normal timeout, when 437 * situation becomes dangerous. 438 * 439 * Essentially, we reserve half of room for young 440 * embrions; and abort old ones without pity, if old 441 * ones are about to clog our table. 442 */ 443 if (lopt->qlen>>(lopt->max_qlen_log-1)) { 444 int young = (lopt->qlen_young<<1); 445 446 while (thresh > 2) { 447 if (lopt->qlen < young) 448 break; 449 thresh--; 450 young <<= 1; 451 } 452 } 453 454 if (queue->rskq_defer_accept) 455 max_retries = queue->rskq_defer_accept; 456 457 budget = 2 * (lopt->nr_table_entries / (timeout / interval)); 458 i = lopt->clock_hand; 459 460 do { 461 reqp=&lopt->syn_table[i]; 462 while ((req = *reqp) != NULL) { 463 if (time_after_eq(now, req->expires)) { 464 if ((req->retrans < thresh || 465 (inet_rsk(req)->acked && req->retrans < max_retries)) 466 && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) { 467 unsigned long timeo; 468 469 if (req->retrans++ == 0) 470 lopt->qlen_young--; 471 timeo = min((timeout << req->retrans), max_rto); 472 req->expires = now + timeo; 473 reqp = &req->dl_next; 474 continue; 475 } 476 477 /* Drop this request */ 478 inet_csk_reqsk_queue_unlink(parent, req, reqp); 479 reqsk_queue_removed(queue, req); 480 reqsk_free(req); 481 continue; 482 } 483 reqp = &req->dl_next; 484 } 485 486 i = (i + 1) & (lopt->nr_table_entries - 1); 487 488 } while (--budget > 0); 489 490 lopt->clock_hand = i; 491 492 if (lopt->qlen) 493 inet_csk_reset_keepalive_timer(parent, interval); 494} 495 496EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune); 497 498struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req, 499 const gfp_t priority) 500{ 501 struct sock *newsk = sk_clone(sk, priority); 502 503 if (newsk != NULL) { 504 struct inet_connection_sock *newicsk = inet_csk(newsk); 505 506 newsk->sk_state = TCP_SYN_RECV; 507 newicsk->icsk_bind_hash = NULL; 508 509 inet_sk(newsk)->dport = inet_rsk(req)->rmt_port; 510 newsk->sk_write_space = sk_stream_write_space; 511 512 newicsk->icsk_retransmits = 0; 513 newicsk->icsk_backoff = 0; 514 newicsk->icsk_probes_out = 0; 515 516 /* Deinitialize accept_queue to trap illegal accesses. */ 517 memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue)); 518 519 security_inet_csk_clone(newsk, req); 520 } 521 return newsk; 522} 523 524EXPORT_SYMBOL_GPL(inet_csk_clone); 525 526/* 527 * At this point, there should be no process reference to this 528 * socket, and thus no user references at all. Therefore we 529 * can assume the socket waitqueue is inactive and nobody will 530 * try to jump onto it. 531 */ 532void inet_csk_destroy_sock(struct sock *sk) 533{ 534 BUG_TRAP(sk->sk_state == TCP_CLOSE); 535 BUG_TRAP(sock_flag(sk, SOCK_DEAD)); 536 537 /* It cannot be in hash table! */ 538 BUG_TRAP(sk_unhashed(sk)); 539 540 /* If it has not 0 inet_sk(sk)->num, it must be bound */ 541 BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash); 542 543 sk->sk_prot->destroy(sk); 544 545 sk_stream_kill_queues(sk); 546 547 xfrm_sk_free_policy(sk); 548 549 sk_refcnt_debug_release(sk); 550 551 atomic_dec(sk->sk_prot->orphan_count); 552 sock_put(sk); 553} 554 555EXPORT_SYMBOL(inet_csk_destroy_sock); 556 557int inet_csk_listen_start(struct sock *sk, const int nr_table_entries) 558{ 559 struct inet_sock *inet = inet_sk(sk); 560 struct inet_connection_sock *icsk = inet_csk(sk); 561 int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries); 562 563 if (rc != 0) 564 return rc; 565 566 sk->sk_max_ack_backlog = 0; 567 sk->sk_ack_backlog = 0; 568 inet_csk_delack_init(sk); 569 570 /* There is race window here: we announce ourselves listening, 571 * but this transition is still not validated by get_port(). 572 * It is OK, because this socket enters to hash table only 573 * after validation is complete. 574 */ 575 sk->sk_state = TCP_LISTEN; 576 if (!sk->sk_prot->get_port(sk, inet->num)) { 577 inet->sport = htons(inet->num); 578 579 sk_dst_reset(sk); 580 sk->sk_prot->hash(sk); 581 582 return 0; 583 } 584 585 sk->sk_state = TCP_CLOSE; 586 __reqsk_queue_destroy(&icsk->icsk_accept_queue); 587 return -EADDRINUSE; 588} 589 590EXPORT_SYMBOL_GPL(inet_csk_listen_start); 591 592/* 593 * This routine closes sockets which have been at least partially 594 * opened, but not yet accepted. 595 */ 596void inet_csk_listen_stop(struct sock *sk) 597{ 598 struct inet_connection_sock *icsk = inet_csk(sk); 599 struct request_sock *acc_req; 600 struct request_sock *req; 601 602 inet_csk_delete_keepalive_timer(sk); 603 604 /* make all the listen_opt local to us */ 605 acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue); 606 607 /* Following specs, it would be better either to send FIN 608 * (and enter FIN-WAIT-1, it is normal close) 609 * or to send active reset (abort). 610 * Certainly, it is pretty dangerous while synflood, but it is 611 * bad justification for our negligence 8) 612 * To be honest, we are not able to make either 613 * of the variants now. --ANK 614 */ 615 reqsk_queue_destroy(&icsk->icsk_accept_queue); 616 617 while ((req = acc_req) != NULL) { 618 struct sock *child = req->sk; 619 620 acc_req = req->dl_next; 621 622 local_bh_disable(); 623 bh_lock_sock(child); 624 BUG_TRAP(!sock_owned_by_user(child)); 625 sock_hold(child); 626 627 sk->sk_prot->disconnect(child, O_NONBLOCK); 628 629 sock_orphan(child); 630 631 atomic_inc(sk->sk_prot->orphan_count); 632 633 inet_csk_destroy_sock(child); 634 635 bh_unlock_sock(child); 636 local_bh_enable(); 637 sock_put(child); 638 639 sk_acceptq_removed(sk); 640 __reqsk_free(req); 641 } 642 BUG_TRAP(!sk->sk_ack_backlog); 643} 644 645EXPORT_SYMBOL_GPL(inet_csk_listen_stop); 646 647void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) 648{ 649 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 650 const struct inet_sock *inet = inet_sk(sk); 651 652 sin->sin_family = AF_INET; 653 sin->sin_addr.s_addr = inet->daddr; 654 sin->sin_port = inet->dport; 655} 656 657EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr); 658 659int inet_csk_ctl_sock_create(struct socket **sock, unsigned short family, 660 unsigned short type, unsigned char protocol) 661{ 662 int rc = sock_create_kern(family, type, protocol, sock); 663 664 if (rc == 0) { 665 (*sock)->sk->sk_allocation = GFP_ATOMIC; 666 inet_sk((*sock)->sk)->uc_ttl = -1; 667 /* 668 * Unhash it so that IP input processing does not even see it, 669 * we do not wish this socket to see incoming packets. 670 */ 671 (*sock)->sk->sk_prot->unhash((*sock)->sk); 672 } 673 return rc; 674} 675 676EXPORT_SYMBOL_GPL(inet_csk_ctl_sock_create); 677 678#ifdef CONFIG_COMPAT 679int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, 680 char __user *optval, int __user *optlen) 681{ 682 const struct inet_connection_sock *icsk = inet_csk(sk); 683 684 if (icsk->icsk_af_ops->compat_getsockopt != NULL) 685 return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname, 686 optval, optlen); 687 return icsk->icsk_af_ops->getsockopt(sk, level, optname, 688 optval, optlen); 689} 690 691EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt); 692 693int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, 694 char __user *optval, int optlen) 695{ 696 const struct inet_connection_sock *icsk = inet_csk(sk); 697 698 if (icsk->icsk_af_ops->compat_setsockopt != NULL) 699 return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname, 700 optval, optlen); 701 return icsk->icsk_af_ops->setsockopt(sk, level, optname, 702 optval, optlen); 703} 704 705EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt); 706#endif 707