inet_connection_sock.c revision 941b1d22cc035ad58b3d9b44a1c74efac2d7e499
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 struct net *net = sk->sk_net; 91 92 local_bh_disable(); 93 if (!snum) { 94 int remaining, rover, low, high; 95 96 inet_get_local_port_range(&low, &high); 97 remaining = (high - low) + 1; 98 rover = net_random() % remaining + low; 99 100 do { 101 head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)]; 102 spin_lock(&head->lock); 103 inet_bind_bucket_for_each(tb, node, &head->chain) 104 if (tb->ib_net == net && tb->port == rover) 105 goto next; 106 break; 107 next: 108 spin_unlock(&head->lock); 109 if (++rover > high) 110 rover = low; 111 } while (--remaining > 0); 112 113 /* Exhausted local port range during search? It is not 114 * possible for us to be holding one of the bind hash 115 * locks if this test triggers, because if 'remaining' 116 * drops to zero, we broke out of the do/while loop at 117 * the top level, not from the 'break;' statement. 118 */ 119 ret = 1; 120 if (remaining <= 0) 121 goto fail; 122 123 /* OK, here is the one we will use. HEAD is 124 * non-NULL and we hold it's mutex. 125 */ 126 snum = rover; 127 } else { 128 head = &hashinfo->bhash[inet_bhashfn(snum, hashinfo->bhash_size)]; 129 spin_lock(&head->lock); 130 inet_bind_bucket_for_each(tb, node, &head->chain) 131 if (tb->ib_net == net && tb->port == snum) 132 goto tb_found; 133 } 134 tb = NULL; 135 goto tb_not_found; 136tb_found: 137 if (!hlist_empty(&tb->owners)) { 138 if (sk->sk_reuse > 1) 139 goto success; 140 if (tb->fastreuse > 0 && 141 sk->sk_reuse && sk->sk_state != TCP_LISTEN) { 142 goto success; 143 } else { 144 ret = 1; 145 if (bind_conflict(sk, tb)) 146 goto fail_unlock; 147 } 148 } 149tb_not_found: 150 ret = 1; 151 if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, 152 net, head, snum)) == NULL) 153 goto fail_unlock; 154 if (hlist_empty(&tb->owners)) { 155 if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) 156 tb->fastreuse = 1; 157 else 158 tb->fastreuse = 0; 159 } else if (tb->fastreuse && 160 (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) 161 tb->fastreuse = 0; 162success: 163 if (!inet_csk(sk)->icsk_bind_hash) 164 inet_bind_hash(sk, tb, snum); 165 BUG_TRAP(inet_csk(sk)->icsk_bind_hash == tb); 166 ret = 0; 167 168fail_unlock: 169 spin_unlock(&head->lock); 170fail: 171 local_bh_enable(); 172 return ret; 173} 174 175EXPORT_SYMBOL_GPL(inet_csk_get_port); 176 177/* 178 * Wait for an incoming connection, avoid race conditions. This must be called 179 * with the socket locked. 180 */ 181static int inet_csk_wait_for_connect(struct sock *sk, long timeo) 182{ 183 struct inet_connection_sock *icsk = inet_csk(sk); 184 DEFINE_WAIT(wait); 185 int err; 186 187 /* 188 * True wake-one mechanism for incoming connections: only 189 * one process gets woken up, not the 'whole herd'. 190 * Since we do not 'race & poll' for established sockets 191 * anymore, the common case will execute the loop only once. 192 * 193 * Subtle issue: "add_wait_queue_exclusive()" will be added 194 * after any current non-exclusive waiters, and we know that 195 * it will always _stay_ after any new non-exclusive waiters 196 * because all non-exclusive waiters are added at the 197 * beginning of the wait-queue. As such, it's ok to "drop" 198 * our exclusiveness temporarily when we get woken up without 199 * having to remove and re-insert us on the wait queue. 200 */ 201 for (;;) { 202 prepare_to_wait_exclusive(sk->sk_sleep, &wait, 203 TASK_INTERRUPTIBLE); 204 release_sock(sk); 205 if (reqsk_queue_empty(&icsk->icsk_accept_queue)) 206 timeo = schedule_timeout(timeo); 207 lock_sock(sk); 208 err = 0; 209 if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) 210 break; 211 err = -EINVAL; 212 if (sk->sk_state != TCP_LISTEN) 213 break; 214 err = sock_intr_errno(timeo); 215 if (signal_pending(current)) 216 break; 217 err = -EAGAIN; 218 if (!timeo) 219 break; 220 } 221 finish_wait(sk->sk_sleep, &wait); 222 return err; 223} 224 225/* 226 * This will accept the next outstanding connection. 227 */ 228struct sock *inet_csk_accept(struct sock *sk, int flags, int *err) 229{ 230 struct inet_connection_sock *icsk = inet_csk(sk); 231 struct sock *newsk; 232 int error; 233 234 lock_sock(sk); 235 236 /* We need to make sure that this socket is listening, 237 * and that it has something pending. 238 */ 239 error = -EINVAL; 240 if (sk->sk_state != TCP_LISTEN) 241 goto out_err; 242 243 /* Find already established connection */ 244 if (reqsk_queue_empty(&icsk->icsk_accept_queue)) { 245 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 246 247 /* If this is a non blocking socket don't sleep */ 248 error = -EAGAIN; 249 if (!timeo) 250 goto out_err; 251 252 error = inet_csk_wait_for_connect(sk, timeo); 253 if (error) 254 goto out_err; 255 } 256 257 newsk = reqsk_queue_get_child(&icsk->icsk_accept_queue, sk); 258 BUG_TRAP(newsk->sk_state != TCP_SYN_RECV); 259out: 260 release_sock(sk); 261 return newsk; 262out_err: 263 newsk = NULL; 264 *err = error; 265 goto out; 266} 267 268EXPORT_SYMBOL(inet_csk_accept); 269 270/* 271 * Using different timers for retransmit, delayed acks and probes 272 * We may wish use just one timer maintaining a list of expire jiffies 273 * to optimize. 274 */ 275void inet_csk_init_xmit_timers(struct sock *sk, 276 void (*retransmit_handler)(unsigned long), 277 void (*delack_handler)(unsigned long), 278 void (*keepalive_handler)(unsigned long)) 279{ 280 struct inet_connection_sock *icsk = inet_csk(sk); 281 282 setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler, 283 (unsigned long)sk); 284 setup_timer(&icsk->icsk_delack_timer, delack_handler, 285 (unsigned long)sk); 286 setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk); 287 icsk->icsk_pending = icsk->icsk_ack.pending = 0; 288} 289 290EXPORT_SYMBOL(inet_csk_init_xmit_timers); 291 292void inet_csk_clear_xmit_timers(struct sock *sk) 293{ 294 struct inet_connection_sock *icsk = inet_csk(sk); 295 296 icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0; 297 298 sk_stop_timer(sk, &icsk->icsk_retransmit_timer); 299 sk_stop_timer(sk, &icsk->icsk_delack_timer); 300 sk_stop_timer(sk, &sk->sk_timer); 301} 302 303EXPORT_SYMBOL(inet_csk_clear_xmit_timers); 304 305void inet_csk_delete_keepalive_timer(struct sock *sk) 306{ 307 sk_stop_timer(sk, &sk->sk_timer); 308} 309 310EXPORT_SYMBOL(inet_csk_delete_keepalive_timer); 311 312void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len) 313{ 314 sk_reset_timer(sk, &sk->sk_timer, jiffies + len); 315} 316 317EXPORT_SYMBOL(inet_csk_reset_keepalive_timer); 318 319struct dst_entry* inet_csk_route_req(struct sock *sk, 320 const struct request_sock *req) 321{ 322 struct rtable *rt; 323 const struct inet_request_sock *ireq = inet_rsk(req); 324 struct ip_options *opt = inet_rsk(req)->opt; 325 struct flowi fl = { .oif = sk->sk_bound_dev_if, 326 .nl_u = { .ip4_u = 327 { .daddr = ((opt && opt->srr) ? 328 opt->faddr : 329 ireq->rmt_addr), 330 .saddr = ireq->loc_addr, 331 .tos = RT_CONN_FLAGS(sk) } }, 332 .proto = sk->sk_protocol, 333 .uli_u = { .ports = 334 { .sport = inet_sk(sk)->sport, 335 .dport = ireq->rmt_port } } }; 336 337 security_req_classify_flow(req, &fl); 338 if (ip_route_output_flow(&init_net, &rt, &fl, sk, 0)) { 339 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); 340 return NULL; 341 } 342 if (opt && opt->is_strictroute && rt->rt_dst != rt->rt_gateway) { 343 ip_rt_put(rt); 344 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); 345 return NULL; 346 } 347 return &rt->u.dst; 348} 349 350EXPORT_SYMBOL_GPL(inet_csk_route_req); 351 352static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport, 353 const u32 rnd, const u32 synq_hsize) 354{ 355 return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1); 356} 357 358#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 359#define AF_INET_FAMILY(fam) ((fam) == AF_INET) 360#else 361#define AF_INET_FAMILY(fam) 1 362#endif 363 364struct request_sock *inet_csk_search_req(const struct sock *sk, 365 struct request_sock ***prevp, 366 const __be16 rport, const __be32 raddr, 367 const __be32 laddr) 368{ 369 const struct inet_connection_sock *icsk = inet_csk(sk); 370 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 371 struct request_sock *req, **prev; 372 373 for (prev = &lopt->syn_table[inet_synq_hash(raddr, rport, lopt->hash_rnd, 374 lopt->nr_table_entries)]; 375 (req = *prev) != NULL; 376 prev = &req->dl_next) { 377 const struct inet_request_sock *ireq = inet_rsk(req); 378 379 if (ireq->rmt_port == rport && 380 ireq->rmt_addr == raddr && 381 ireq->loc_addr == laddr && 382 AF_INET_FAMILY(req->rsk_ops->family)) { 383 BUG_TRAP(!req->sk); 384 *prevp = prev; 385 break; 386 } 387 } 388 389 return req; 390} 391 392EXPORT_SYMBOL_GPL(inet_csk_search_req); 393 394void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, 395 unsigned long timeout) 396{ 397 struct inet_connection_sock *icsk = inet_csk(sk); 398 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; 399 const u32 h = inet_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, 400 lopt->hash_rnd, lopt->nr_table_entries); 401 402 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); 403 inet_csk_reqsk_queue_added(sk, timeout); 404} 405 406/* Only thing we need from tcp.h */ 407extern int sysctl_tcp_synack_retries; 408 409EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add); 410 411void inet_csk_reqsk_queue_prune(struct sock *parent, 412 const unsigned long interval, 413 const unsigned long timeout, 414 const unsigned long max_rto) 415{ 416 struct inet_connection_sock *icsk = inet_csk(parent); 417 struct request_sock_queue *queue = &icsk->icsk_accept_queue; 418 struct listen_sock *lopt = queue->listen_opt; 419 int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries; 420 int thresh = max_retries; 421 unsigned long now = jiffies; 422 struct request_sock **reqp, *req; 423 int i, budget; 424 425 if (lopt == NULL || lopt->qlen == 0) 426 return; 427 428 /* Normally all the openreqs are young and become mature 429 * (i.e. converted to established socket) for first timeout. 430 * If synack was not acknowledged for 3 seconds, it means 431 * one of the following things: synack was lost, ack was lost, 432 * rtt is high or nobody planned to ack (i.e. synflood). 433 * When server is a bit loaded, queue is populated with old 434 * open requests, reducing effective size of queue. 435 * When server is well loaded, queue size reduces to zero 436 * after several minutes of work. It is not synflood, 437 * it is normal operation. The solution is pruning 438 * too old entries overriding normal timeout, when 439 * situation becomes dangerous. 440 * 441 * Essentially, we reserve half of room for young 442 * embrions; and abort old ones without pity, if old 443 * ones are about to clog our table. 444 */ 445 if (lopt->qlen>>(lopt->max_qlen_log-1)) { 446 int young = (lopt->qlen_young<<1); 447 448 while (thresh > 2) { 449 if (lopt->qlen < young) 450 break; 451 thresh--; 452 young <<= 1; 453 } 454 } 455 456 if (queue->rskq_defer_accept) 457 max_retries = queue->rskq_defer_accept; 458 459 budget = 2 * (lopt->nr_table_entries / (timeout / interval)); 460 i = lopt->clock_hand; 461 462 do { 463 reqp=&lopt->syn_table[i]; 464 while ((req = *reqp) != NULL) { 465 if (time_after_eq(now, req->expires)) { 466 if ((req->retrans < thresh || 467 (inet_rsk(req)->acked && req->retrans < max_retries)) 468 && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) { 469 unsigned long timeo; 470 471 if (req->retrans++ == 0) 472 lopt->qlen_young--; 473 timeo = min((timeout << req->retrans), max_rto); 474 req->expires = now + timeo; 475 reqp = &req->dl_next; 476 continue; 477 } 478 479 /* Drop this request */ 480 inet_csk_reqsk_queue_unlink(parent, req, reqp); 481 reqsk_queue_removed(queue, req); 482 reqsk_free(req); 483 continue; 484 } 485 reqp = &req->dl_next; 486 } 487 488 i = (i + 1) & (lopt->nr_table_entries - 1); 489 490 } while (--budget > 0); 491 492 lopt->clock_hand = i; 493 494 if (lopt->qlen) 495 inet_csk_reset_keepalive_timer(parent, interval); 496} 497 498EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_prune); 499 500struct sock *inet_csk_clone(struct sock *sk, const struct request_sock *req, 501 const gfp_t priority) 502{ 503 struct sock *newsk = sk_clone(sk, priority); 504 505 if (newsk != NULL) { 506 struct inet_connection_sock *newicsk = inet_csk(newsk); 507 508 newsk->sk_state = TCP_SYN_RECV; 509 newicsk->icsk_bind_hash = NULL; 510 511 inet_sk(newsk)->dport = inet_rsk(req)->rmt_port; 512 newsk->sk_write_space = sk_stream_write_space; 513 514 newicsk->icsk_retransmits = 0; 515 newicsk->icsk_backoff = 0; 516 newicsk->icsk_probes_out = 0; 517 518 /* Deinitialize accept_queue to trap illegal accesses. */ 519 memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue)); 520 521 security_inet_csk_clone(newsk, req); 522 } 523 return newsk; 524} 525 526EXPORT_SYMBOL_GPL(inet_csk_clone); 527 528/* 529 * At this point, there should be no process reference to this 530 * socket, and thus no user references at all. Therefore we 531 * can assume the socket waitqueue is inactive and nobody will 532 * try to jump onto it. 533 */ 534void inet_csk_destroy_sock(struct sock *sk) 535{ 536 BUG_TRAP(sk->sk_state == TCP_CLOSE); 537 BUG_TRAP(sock_flag(sk, SOCK_DEAD)); 538 539 /* It cannot be in hash table! */ 540 BUG_TRAP(sk_unhashed(sk)); 541 542 /* If it has not 0 inet_sk(sk)->num, it must be bound */ 543 BUG_TRAP(!inet_sk(sk)->num || inet_csk(sk)->icsk_bind_hash); 544 545 sk->sk_prot->destroy(sk); 546 547 sk_stream_kill_queues(sk); 548 549 xfrm_sk_free_policy(sk); 550 551 sk_refcnt_debug_release(sk); 552 553 atomic_dec(sk->sk_prot->orphan_count); 554 sock_put(sk); 555} 556 557EXPORT_SYMBOL(inet_csk_destroy_sock); 558 559int inet_csk_listen_start(struct sock *sk, const int nr_table_entries) 560{ 561 struct inet_sock *inet = inet_sk(sk); 562 struct inet_connection_sock *icsk = inet_csk(sk); 563 int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries); 564 565 if (rc != 0) 566 return rc; 567 568 sk->sk_max_ack_backlog = 0; 569 sk->sk_ack_backlog = 0; 570 inet_csk_delack_init(sk); 571 572 /* There is race window here: we announce ourselves listening, 573 * but this transition is still not validated by get_port(). 574 * It is OK, because this socket enters to hash table only 575 * after validation is complete. 576 */ 577 sk->sk_state = TCP_LISTEN; 578 if (!sk->sk_prot->get_port(sk, inet->num)) { 579 inet->sport = htons(inet->num); 580 581 sk_dst_reset(sk); 582 sk->sk_prot->hash(sk); 583 584 return 0; 585 } 586 587 sk->sk_state = TCP_CLOSE; 588 __reqsk_queue_destroy(&icsk->icsk_accept_queue); 589 return -EADDRINUSE; 590} 591 592EXPORT_SYMBOL_GPL(inet_csk_listen_start); 593 594/* 595 * This routine closes sockets which have been at least partially 596 * opened, but not yet accepted. 597 */ 598void inet_csk_listen_stop(struct sock *sk) 599{ 600 struct inet_connection_sock *icsk = inet_csk(sk); 601 struct request_sock *acc_req; 602 struct request_sock *req; 603 604 inet_csk_delete_keepalive_timer(sk); 605 606 /* make all the listen_opt local to us */ 607 acc_req = reqsk_queue_yank_acceptq(&icsk->icsk_accept_queue); 608 609 /* Following specs, it would be better either to send FIN 610 * (and enter FIN-WAIT-1, it is normal close) 611 * or to send active reset (abort). 612 * Certainly, it is pretty dangerous while synflood, but it is 613 * bad justification for our negligence 8) 614 * To be honest, we are not able to make either 615 * of the variants now. --ANK 616 */ 617 reqsk_queue_destroy(&icsk->icsk_accept_queue); 618 619 while ((req = acc_req) != NULL) { 620 struct sock *child = req->sk; 621 622 acc_req = req->dl_next; 623 624 local_bh_disable(); 625 bh_lock_sock(child); 626 BUG_TRAP(!sock_owned_by_user(child)); 627 sock_hold(child); 628 629 sk->sk_prot->disconnect(child, O_NONBLOCK); 630 631 sock_orphan(child); 632 633 atomic_inc(sk->sk_prot->orphan_count); 634 635 inet_csk_destroy_sock(child); 636 637 bh_unlock_sock(child); 638 local_bh_enable(); 639 sock_put(child); 640 641 sk_acceptq_removed(sk); 642 __reqsk_free(req); 643 } 644 BUG_TRAP(!sk->sk_ack_backlog); 645} 646 647EXPORT_SYMBOL_GPL(inet_csk_listen_stop); 648 649void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) 650{ 651 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 652 const struct inet_sock *inet = inet_sk(sk); 653 654 sin->sin_family = AF_INET; 655 sin->sin_addr.s_addr = inet->daddr; 656 sin->sin_port = inet->dport; 657} 658 659EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr); 660 661int inet_csk_ctl_sock_create(struct socket **sock, unsigned short family, 662 unsigned short type, unsigned char protocol) 663{ 664 int rc = sock_create_kern(family, type, protocol, sock); 665 666 if (rc == 0) { 667 (*sock)->sk->sk_allocation = GFP_ATOMIC; 668 inet_sk((*sock)->sk)->uc_ttl = -1; 669 /* 670 * Unhash it so that IP input processing does not even see it, 671 * we do not wish this socket to see incoming packets. 672 */ 673 (*sock)->sk->sk_prot->unhash((*sock)->sk); 674 } 675 return rc; 676} 677 678EXPORT_SYMBOL_GPL(inet_csk_ctl_sock_create); 679 680#ifdef CONFIG_COMPAT 681int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, 682 char __user *optval, int __user *optlen) 683{ 684 const struct inet_connection_sock *icsk = inet_csk(sk); 685 686 if (icsk->icsk_af_ops->compat_getsockopt != NULL) 687 return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname, 688 optval, optlen); 689 return icsk->icsk_af_ops->getsockopt(sk, level, optname, 690 optval, optlen); 691} 692 693EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt); 694 695int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, 696 char __user *optval, int optlen) 697{ 698 const struct inet_connection_sock *icsk = inet_csk(sk); 699 700 if (icsk->icsk_af_ops->compat_setsockopt != NULL) 701 return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname, 702 optval, optlen); 703 return icsk->icsk_af_ops->setsockopt(sk, level, optname, 704 optval, optlen); 705} 706 707EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt); 708#endif 709