tcp_usrreq.c revision 315514
1/*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. 4 * Copyright (c) 2006-2007 Robert N. M. Watson 5 * Copyright (c) 2010-2011 Juniper Networks, Inc. 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Robert N. M. Watson under 9 * contract to Juniper Networks, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: stable/11/sys/netinet/tcp_usrreq.c 315514 2017-03-18 22:04:20Z ae $"); 40 41#include "opt_ddb.h" 42#include "opt_inet.h" 43#include "opt_inet6.h" 44#include "opt_ipsec.h" 45#include "opt_tcpdebug.h" 46 47#include <sys/param.h> 48#include <sys/systm.h> 49#include <sys/limits.h> 50#include <sys/malloc.h> 51#include <sys/refcount.h> 52#include <sys/kernel.h> 53#include <sys/sysctl.h> 54#include <sys/mbuf.h> 55#ifdef INET6 56#include <sys/domain.h> 57#endif /* INET6 */ 58#include <sys/socket.h> 59#include <sys/socketvar.h> 60#include <sys/protosw.h> 61#include <sys/proc.h> 62#include <sys/jail.h> 63#include <sys/syslog.h> 64 65#ifdef DDB 66#include <ddb/ddb.h> 67#endif 68 69#include <net/if.h> 70#include <net/if_var.h> 71#include <net/route.h> 72#include <net/vnet.h> 73 74#include <netinet/in.h> 75#include <netinet/in_kdtrace.h> 76#include <netinet/in_pcb.h> 77#include <netinet/in_systm.h> 78#include <netinet/in_var.h> 79#include <netinet/ip_var.h> 80#ifdef INET6 81#include <netinet/ip6.h> 82#include <netinet6/in6_pcb.h> 83#include <netinet6/ip6_var.h> 84#include <netinet6/scope6_var.h> 85#endif 86#ifdef TCP_RFC7413 87#include <netinet/tcp_fastopen.h> 88#endif 89#include <netinet/tcp.h> 90#include <netinet/tcp_fsm.h> 91#include <netinet/tcp_seq.h> 92#include <netinet/tcp_timer.h> 93#include <netinet/tcp_var.h> 94#include <netinet/tcpip.h> 95#include <netinet/cc/cc.h> 96#ifdef TCPPCAP 97#include <netinet/tcp_pcap.h> 98#endif 99#ifdef TCPDEBUG 100#include <netinet/tcp_debug.h> 101#endif 102#ifdef TCP_OFFLOAD 103#include <netinet/tcp_offload.h> 104#endif 105#include <netipsec/ipsec_support.h> 106 107/* 108 * TCP protocol interface to socket abstraction. 109 */ 110static int tcp_attach(struct socket *); 111#ifdef INET 112static int tcp_connect(struct tcpcb *, struct sockaddr *, 113 struct thread *td); 114#endif /* INET */ 115#ifdef INET6 116static int tcp6_connect(struct tcpcb *, struct sockaddr *, 117 struct thread *td); 118#endif /* INET6 */ 119static void tcp_disconnect(struct tcpcb *); 120static void tcp_usrclosed(struct tcpcb *); 121static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 122 123#ifdef TCPDEBUG 124#define TCPDEBUG0 int ostate = 0 125#define TCPDEBUG1() ostate = tp ? tp->t_state : 0 126#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 127 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 128#else 129#define TCPDEBUG0 130#define TCPDEBUG1() 131#define TCPDEBUG2(req) 132#endif 133 134/* 135 * TCP attaches to socket via pru_attach(), reserving space, 136 * and an internet control block. 137 */ 138static int 139tcp_usr_attach(struct socket *so, int proto, struct thread *td) 140{ 141 struct inpcb *inp; 142 struct tcpcb *tp = NULL; 143 int error; 144 TCPDEBUG0; 145 146 inp = sotoinpcb(so); 147 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 148 TCPDEBUG1(); 149 150 error = tcp_attach(so); 151 if (error) 152 goto out; 153 154 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 155 so->so_linger = TCP_LINGERTIME; 156 157 inp = sotoinpcb(so); 158 tp = intotcpcb(inp); 159out: 160 TCPDEBUG2(PRU_ATTACH); 161 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 162 return error; 163} 164 165/* 166 * tcp_detach is called when the socket layer loses its final reference 167 * to the socket, be it a file descriptor reference, a reference from TCP, 168 * etc. At this point, there is only one case in which we will keep around 169 * inpcb state: time wait. 170 * 171 * This function can probably be re-absorbed back into tcp_usr_detach() now 172 * that there is a single detach path. 173 */ 174static void 175tcp_detach(struct socket *so, struct inpcb *inp) 176{ 177 struct tcpcb *tp; 178 179 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 180 INP_WLOCK_ASSERT(inp); 181 182 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 183 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 184 185 tp = intotcpcb(inp); 186 187 if (inp->inp_flags & INP_TIMEWAIT) { 188 /* 189 * There are two cases to handle: one in which the time wait 190 * state is being discarded (INP_DROPPED), and one in which 191 * this connection will remain in timewait. In the former, 192 * it is time to discard all state (except tcptw, which has 193 * already been discarded by the timewait close code, which 194 * should be further up the call stack somewhere). In the 195 * latter case, we detach from the socket, but leave the pcb 196 * present until timewait ends. 197 * 198 * XXXRW: Would it be cleaner to free the tcptw here? 199 * 200 * Astute question indeed, from twtcp perspective there are 201 * three cases to consider: 202 * 203 * #1 tcp_detach is called at tcptw creation time by 204 * tcp_twstart, then do not discard the newly created tcptw 205 * and leave inpcb present until timewait ends 206 * #2 tcp_detach is called at timewait end (or reuse) by 207 * tcp_twclose, then the tcptw has already been discarded 208 * (or reused) and inpcb is freed here 209 * #3 tcp_detach is called() after timewait ends (or reuse) 210 * (e.g. by soclose), then tcptw has already been discarded 211 * (or reused) and inpcb is freed here 212 * 213 * In all three cases the tcptw should not be freed here. 214 */ 215 if (inp->inp_flags & INP_DROPPED) { 216 in_pcbdetach(inp); 217 if (__predict_true(tp == NULL)) { 218 in_pcbfree(inp); 219 } else { 220 /* 221 * This case should not happen as in TIMEWAIT 222 * state the inp should not be destroyed before 223 * its tcptw. If INVARIANTS is defined, panic. 224 */ 225#ifdef INVARIANTS 226 panic("%s: Panic before an inp double-free: " 227 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 228 , __func__); 229#else 230 log(LOG_ERR, "%s: Avoid an inp double-free: " 231 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 232 , __func__); 233#endif 234 INP_WUNLOCK(inp); 235 } 236 } else { 237 in_pcbdetach(inp); 238 INP_WUNLOCK(inp); 239 } 240 } else { 241 /* 242 * If the connection is not in timewait, we consider two 243 * two conditions: one in which no further processing is 244 * necessary (dropped || embryonic), and one in which TCP is 245 * not yet done, but no longer requires the socket, so the 246 * pcb will persist for the time being. 247 * 248 * XXXRW: Does the second case still occur? 249 */ 250 if (inp->inp_flags & INP_DROPPED || 251 tp->t_state < TCPS_SYN_SENT) { 252 tcp_discardcb(tp); 253 in_pcbdetach(inp); 254 in_pcbfree(inp); 255 } else { 256 in_pcbdetach(inp); 257 INP_WUNLOCK(inp); 258 } 259 } 260} 261 262/* 263 * pru_detach() detaches the TCP protocol from the socket. 264 * If the protocol state is non-embryonic, then can't 265 * do this directly: have to initiate a pru_disconnect(), 266 * which may finish later; embryonic TCB's can just 267 * be discarded here. 268 */ 269static void 270tcp_usr_detach(struct socket *so) 271{ 272 struct inpcb *inp; 273 int rlock = 0; 274 275 inp = sotoinpcb(so); 276 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 277 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 278 INP_INFO_RLOCK(&V_tcbinfo); 279 rlock = 1; 280 } 281 INP_WLOCK(inp); 282 KASSERT(inp->inp_socket != NULL, 283 ("tcp_usr_detach: inp_socket == NULL")); 284 tcp_detach(so, inp); 285 if (rlock) 286 INP_INFO_RUNLOCK(&V_tcbinfo); 287} 288 289#ifdef INET 290/* 291 * Give the socket an address. 292 */ 293static int 294tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 295{ 296 int error = 0; 297 struct inpcb *inp; 298 struct tcpcb *tp = NULL; 299 struct sockaddr_in *sinp; 300 301 sinp = (struct sockaddr_in *)nam; 302 if (nam->sa_len != sizeof (*sinp)) 303 return (EINVAL); 304 /* 305 * Must check for multicast addresses and disallow binding 306 * to them. 307 */ 308 if (sinp->sin_family == AF_INET && 309 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 310 return (EAFNOSUPPORT); 311 312 TCPDEBUG0; 313 inp = sotoinpcb(so); 314 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 315 INP_WLOCK(inp); 316 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 317 error = EINVAL; 318 goto out; 319 } 320 tp = intotcpcb(inp); 321 TCPDEBUG1(); 322 INP_HASH_WLOCK(&V_tcbinfo); 323 error = in_pcbbind(inp, nam, td->td_ucred); 324 INP_HASH_WUNLOCK(&V_tcbinfo); 325out: 326 TCPDEBUG2(PRU_BIND); 327 TCP_PROBE2(debug__user, tp, PRU_BIND); 328 INP_WUNLOCK(inp); 329 330 return (error); 331} 332#endif /* INET */ 333 334#ifdef INET6 335static int 336tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 337{ 338 int error = 0; 339 struct inpcb *inp; 340 struct tcpcb *tp = NULL; 341 struct sockaddr_in6 *sin6p; 342 343 sin6p = (struct sockaddr_in6 *)nam; 344 if (nam->sa_len != sizeof (*sin6p)) 345 return (EINVAL); 346 /* 347 * Must check for multicast addresses and disallow binding 348 * to them. 349 */ 350 if (sin6p->sin6_family == AF_INET6 && 351 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 352 return (EAFNOSUPPORT); 353 354 TCPDEBUG0; 355 inp = sotoinpcb(so); 356 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 357 INP_WLOCK(inp); 358 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 359 error = EINVAL; 360 goto out; 361 } 362 tp = intotcpcb(inp); 363 TCPDEBUG1(); 364 INP_HASH_WLOCK(&V_tcbinfo); 365 inp->inp_vflag &= ~INP_IPV4; 366 inp->inp_vflag |= INP_IPV6; 367#ifdef INET 368 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 369 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 370 inp->inp_vflag |= INP_IPV4; 371 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 372 struct sockaddr_in sin; 373 374 in6_sin6_2_sin(&sin, sin6p); 375 inp->inp_vflag |= INP_IPV4; 376 inp->inp_vflag &= ~INP_IPV6; 377 error = in_pcbbind(inp, (struct sockaddr *)&sin, 378 td->td_ucred); 379 INP_HASH_WUNLOCK(&V_tcbinfo); 380 goto out; 381 } 382 } 383#endif 384 error = in6_pcbbind(inp, nam, td->td_ucred); 385 INP_HASH_WUNLOCK(&V_tcbinfo); 386out: 387 TCPDEBUG2(PRU_BIND); 388 TCP_PROBE2(debug__user, tp, PRU_BIND); 389 INP_WUNLOCK(inp); 390 return (error); 391} 392#endif /* INET6 */ 393 394#ifdef INET 395/* 396 * Prepare to accept connections. 397 */ 398static int 399tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 400{ 401 int error = 0; 402 struct inpcb *inp; 403 struct tcpcb *tp = NULL; 404 405 TCPDEBUG0; 406 inp = sotoinpcb(so); 407 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 408 INP_WLOCK(inp); 409 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 410 error = EINVAL; 411 goto out; 412 } 413 tp = intotcpcb(inp); 414 TCPDEBUG1(); 415 SOCK_LOCK(so); 416 error = solisten_proto_check(so); 417 INP_HASH_WLOCK(&V_tcbinfo); 418 if (error == 0 && inp->inp_lport == 0) 419 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 420 INP_HASH_WUNLOCK(&V_tcbinfo); 421 if (error == 0) { 422 tcp_state_change(tp, TCPS_LISTEN); 423 solisten_proto(so, backlog); 424#ifdef TCP_OFFLOAD 425 if ((so->so_options & SO_NO_OFFLOAD) == 0) 426 tcp_offload_listen_start(tp); 427#endif 428 } 429 SOCK_UNLOCK(so); 430 431#ifdef TCP_RFC7413 432 if (tp->t_flags & TF_FASTOPEN) 433 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 434#endif 435out: 436 TCPDEBUG2(PRU_LISTEN); 437 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 438 INP_WUNLOCK(inp); 439 return (error); 440} 441#endif /* INET */ 442 443#ifdef INET6 444static int 445tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 446{ 447 int error = 0; 448 struct inpcb *inp; 449 struct tcpcb *tp = NULL; 450 451 TCPDEBUG0; 452 inp = sotoinpcb(so); 453 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 454 INP_WLOCK(inp); 455 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 456 error = EINVAL; 457 goto out; 458 } 459 tp = intotcpcb(inp); 460 TCPDEBUG1(); 461 SOCK_LOCK(so); 462 error = solisten_proto_check(so); 463 INP_HASH_WLOCK(&V_tcbinfo); 464 if (error == 0 && inp->inp_lport == 0) { 465 inp->inp_vflag &= ~INP_IPV4; 466 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 467 inp->inp_vflag |= INP_IPV4; 468 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 469 } 470 INP_HASH_WUNLOCK(&V_tcbinfo); 471 if (error == 0) { 472 tcp_state_change(tp, TCPS_LISTEN); 473 solisten_proto(so, backlog); 474#ifdef TCP_OFFLOAD 475 if ((so->so_options & SO_NO_OFFLOAD) == 0) 476 tcp_offload_listen_start(tp); 477#endif 478 } 479 SOCK_UNLOCK(so); 480 481#ifdef TCP_RFC7413 482 if (tp->t_flags & TF_FASTOPEN) 483 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 484#endif 485out: 486 TCPDEBUG2(PRU_LISTEN); 487 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 488 INP_WUNLOCK(inp); 489 return (error); 490} 491#endif /* INET6 */ 492 493#ifdef INET 494/* 495 * Initiate connection to peer. 496 * Create a template for use in transmissions on this connection. 497 * Enter SYN_SENT state, and mark socket as connecting. 498 * Start keep-alive timer, and seed output sequence space. 499 * Send initial segment on connection. 500 */ 501static int 502tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 503{ 504 int error = 0; 505 struct inpcb *inp; 506 struct tcpcb *tp = NULL; 507 struct sockaddr_in *sinp; 508 509 sinp = (struct sockaddr_in *)nam; 510 if (nam->sa_len != sizeof (*sinp)) 511 return (EINVAL); 512 /* 513 * Must disallow TCP ``connections'' to multicast addresses. 514 */ 515 if (sinp->sin_family == AF_INET 516 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 517 return (EAFNOSUPPORT); 518 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 519 return (error); 520 521 TCPDEBUG0; 522 inp = sotoinpcb(so); 523 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 524 INP_WLOCK(inp); 525 if (inp->inp_flags & INP_TIMEWAIT) { 526 error = EADDRINUSE; 527 goto out; 528 } 529 if (inp->inp_flags & INP_DROPPED) { 530 error = ECONNREFUSED; 531 goto out; 532 } 533 tp = intotcpcb(inp); 534 TCPDEBUG1(); 535 if ((error = tcp_connect(tp, nam, td)) != 0) 536 goto out; 537#ifdef TCP_OFFLOAD 538 if (registered_toedevs > 0 && 539 (so->so_options & SO_NO_OFFLOAD) == 0 && 540 (error = tcp_offload_connect(so, nam)) == 0) 541 goto out; 542#endif 543 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 544 error = tp->t_fb->tfb_tcp_output(tp); 545out: 546 TCPDEBUG2(PRU_CONNECT); 547 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 548 INP_WUNLOCK(inp); 549 return (error); 550} 551#endif /* INET */ 552 553#ifdef INET6 554static int 555tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 556{ 557 int error = 0; 558 struct inpcb *inp; 559 struct tcpcb *tp = NULL; 560 struct sockaddr_in6 *sin6p; 561 562 TCPDEBUG0; 563 564 sin6p = (struct sockaddr_in6 *)nam; 565 if (nam->sa_len != sizeof (*sin6p)) 566 return (EINVAL); 567 /* 568 * Must disallow TCP ``connections'' to multicast addresses. 569 */ 570 if (sin6p->sin6_family == AF_INET6 571 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 572 return (EAFNOSUPPORT); 573 574 inp = sotoinpcb(so); 575 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 576 INP_WLOCK(inp); 577 if (inp->inp_flags & INP_TIMEWAIT) { 578 error = EADDRINUSE; 579 goto out; 580 } 581 if (inp->inp_flags & INP_DROPPED) { 582 error = ECONNREFUSED; 583 goto out; 584 } 585 tp = intotcpcb(inp); 586 TCPDEBUG1(); 587#ifdef INET 588 /* 589 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 590 * therefore probably require the hash lock, which isn't held here. 591 * Is this a significant problem? 592 */ 593 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 594 struct sockaddr_in sin; 595 596 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 597 error = EINVAL; 598 goto out; 599 } 600 601 in6_sin6_2_sin(&sin, sin6p); 602 inp->inp_vflag |= INP_IPV4; 603 inp->inp_vflag &= ~INP_IPV6; 604 if ((error = prison_remote_ip4(td->td_ucred, 605 &sin.sin_addr)) != 0) 606 goto out; 607 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 608 goto out; 609#ifdef TCP_OFFLOAD 610 if (registered_toedevs > 0 && 611 (so->so_options & SO_NO_OFFLOAD) == 0 && 612 (error = tcp_offload_connect(so, nam)) == 0) 613 goto out; 614#endif 615 error = tp->t_fb->tfb_tcp_output(tp); 616 goto out; 617 } 618#endif 619 inp->inp_vflag &= ~INP_IPV4; 620 inp->inp_vflag |= INP_IPV6; 621 inp->inp_inc.inc_flags |= INC_ISIPV6; 622 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 623 goto out; 624 if ((error = tcp6_connect(tp, nam, td)) != 0) 625 goto out; 626#ifdef TCP_OFFLOAD 627 if (registered_toedevs > 0 && 628 (so->so_options & SO_NO_OFFLOAD) == 0 && 629 (error = tcp_offload_connect(so, nam)) == 0) 630 goto out; 631#endif 632 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 633 error = tp->t_fb->tfb_tcp_output(tp); 634 635out: 636 TCPDEBUG2(PRU_CONNECT); 637 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 638 INP_WUNLOCK(inp); 639 return (error); 640} 641#endif /* INET6 */ 642 643/* 644 * Initiate disconnect from peer. 645 * If connection never passed embryonic stage, just drop; 646 * else if don't need to let data drain, then can just drop anyways, 647 * else have to begin TCP shutdown process: mark socket disconnecting, 648 * drain unread data, state switch to reflect user close, and 649 * send segment (e.g. FIN) to peer. Socket will be really disconnected 650 * when peer sends FIN and acks ours. 651 * 652 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 653 */ 654static int 655tcp_usr_disconnect(struct socket *so) 656{ 657 struct inpcb *inp; 658 struct tcpcb *tp = NULL; 659 int error = 0; 660 661 TCPDEBUG0; 662 INP_INFO_RLOCK(&V_tcbinfo); 663 inp = sotoinpcb(so); 664 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 665 INP_WLOCK(inp); 666 if (inp->inp_flags & INP_TIMEWAIT) 667 goto out; 668 if (inp->inp_flags & INP_DROPPED) { 669 error = ECONNRESET; 670 goto out; 671 } 672 tp = intotcpcb(inp); 673 TCPDEBUG1(); 674 tcp_disconnect(tp); 675out: 676 TCPDEBUG2(PRU_DISCONNECT); 677 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 678 INP_WUNLOCK(inp); 679 INP_INFO_RUNLOCK(&V_tcbinfo); 680 return (error); 681} 682 683#ifdef INET 684/* 685 * Accept a connection. Essentially all the work is done at higher levels; 686 * just return the address of the peer, storing through addr. 687 */ 688static int 689tcp_usr_accept(struct socket *so, struct sockaddr **nam) 690{ 691 int error = 0; 692 struct inpcb *inp = NULL; 693 struct tcpcb *tp = NULL; 694 struct in_addr addr; 695 in_port_t port = 0; 696 TCPDEBUG0; 697 698 if (so->so_state & SS_ISDISCONNECTED) 699 return (ECONNABORTED); 700 701 inp = sotoinpcb(so); 702 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 703 INP_WLOCK(inp); 704 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 705 error = ECONNABORTED; 706 goto out; 707 } 708 tp = intotcpcb(inp); 709 TCPDEBUG1(); 710 711 /* 712 * We inline in_getpeeraddr and COMMON_END here, so that we can 713 * copy the data of interest and defer the malloc until after we 714 * release the lock. 715 */ 716 port = inp->inp_fport; 717 addr = inp->inp_faddr; 718 719out: 720 TCPDEBUG2(PRU_ACCEPT); 721 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 722 INP_WUNLOCK(inp); 723 if (error == 0) 724 *nam = in_sockaddr(port, &addr); 725 return error; 726} 727#endif /* INET */ 728 729#ifdef INET6 730static int 731tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 732{ 733 struct inpcb *inp = NULL; 734 int error = 0; 735 struct tcpcb *tp = NULL; 736 struct in_addr addr; 737 struct in6_addr addr6; 738 in_port_t port = 0; 739 int v4 = 0; 740 TCPDEBUG0; 741 742 if (so->so_state & SS_ISDISCONNECTED) 743 return (ECONNABORTED); 744 745 inp = sotoinpcb(so); 746 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 747 INP_INFO_RLOCK(&V_tcbinfo); 748 INP_WLOCK(inp); 749 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 750 error = ECONNABORTED; 751 goto out; 752 } 753 tp = intotcpcb(inp); 754 TCPDEBUG1(); 755 756 /* 757 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 758 * copy the data of interest and defer the malloc until after we 759 * release the lock. 760 */ 761 if (inp->inp_vflag & INP_IPV4) { 762 v4 = 1; 763 port = inp->inp_fport; 764 addr = inp->inp_faddr; 765 } else { 766 port = inp->inp_fport; 767 addr6 = inp->in6p_faddr; 768 } 769 770out: 771 TCPDEBUG2(PRU_ACCEPT); 772 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 773 INP_WUNLOCK(inp); 774 INP_INFO_RUNLOCK(&V_tcbinfo); 775 if (error == 0) { 776 if (v4) 777 *nam = in6_v4mapsin6_sockaddr(port, &addr); 778 else 779 *nam = in6_sockaddr(port, &addr6); 780 } 781 return error; 782} 783#endif /* INET6 */ 784 785/* 786 * Mark the connection as being incapable of further output. 787 */ 788static int 789tcp_usr_shutdown(struct socket *so) 790{ 791 int error = 0; 792 struct inpcb *inp; 793 struct tcpcb *tp = NULL; 794 795 TCPDEBUG0; 796 INP_INFO_RLOCK(&V_tcbinfo); 797 inp = sotoinpcb(so); 798 KASSERT(inp != NULL, ("inp == NULL")); 799 INP_WLOCK(inp); 800 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 801 error = ECONNRESET; 802 goto out; 803 } 804 tp = intotcpcb(inp); 805 TCPDEBUG1(); 806 socantsendmore(so); 807 tcp_usrclosed(tp); 808 if (!(inp->inp_flags & INP_DROPPED)) 809 error = tp->t_fb->tfb_tcp_output(tp); 810 811out: 812 TCPDEBUG2(PRU_SHUTDOWN); 813 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 814 INP_WUNLOCK(inp); 815 INP_INFO_RUNLOCK(&V_tcbinfo); 816 817 return (error); 818} 819 820/* 821 * After a receive, possibly send window update to peer. 822 */ 823static int 824tcp_usr_rcvd(struct socket *so, int flags) 825{ 826 struct inpcb *inp; 827 struct tcpcb *tp = NULL; 828 int error = 0; 829 830 TCPDEBUG0; 831 inp = sotoinpcb(so); 832 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 833 INP_WLOCK(inp); 834 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 835 error = ECONNRESET; 836 goto out; 837 } 838 tp = intotcpcb(inp); 839 TCPDEBUG1(); 840#ifdef TCP_RFC7413 841 /* 842 * For passively-created TFO connections, don't attempt a window 843 * update while still in SYN_RECEIVED as this may trigger an early 844 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 845 * application response data, or failing that, when the DELACK timer 846 * expires. 847 */ 848 if ((tp->t_flags & TF_FASTOPEN) && 849 (tp->t_state == TCPS_SYN_RECEIVED)) 850 goto out; 851#endif 852#ifdef TCP_OFFLOAD 853 if (tp->t_flags & TF_TOE) 854 tcp_offload_rcvd(tp); 855 else 856#endif 857 tp->t_fb->tfb_tcp_output(tp); 858 859out: 860 TCPDEBUG2(PRU_RCVD); 861 TCP_PROBE2(debug__user, tp, PRU_RCVD); 862 INP_WUNLOCK(inp); 863 return (error); 864} 865 866/* 867 * Do a send by putting data in output queue and updating urgent 868 * marker if URG set. Possibly send more data. Unlike the other 869 * pru_*() routines, the mbuf chains are our responsibility. We 870 * must either enqueue them or free them. The other pru_* routines 871 * generally are caller-frees. 872 */ 873static int 874tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 875 struct sockaddr *nam, struct mbuf *control, struct thread *td) 876{ 877 int error = 0; 878 struct inpcb *inp; 879 struct tcpcb *tp = NULL; 880#ifdef INET6 881 int isipv6; 882#endif 883 TCPDEBUG0; 884 885 /* 886 * We require the pcbinfo lock if we will close the socket as part of 887 * this call. 888 */ 889 if (flags & PRUS_EOF) 890 INP_INFO_RLOCK(&V_tcbinfo); 891 inp = sotoinpcb(so); 892 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 893 INP_WLOCK(inp); 894 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 895 if (control) 896 m_freem(control); 897 /* 898 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 899 * for freeing memory. 900 */ 901 if (m && (flags & PRUS_NOTREADY) == 0) 902 m_freem(m); 903 error = ECONNRESET; 904 goto out; 905 } 906#ifdef INET6 907 isipv6 = nam && nam->sa_family == AF_INET6; 908#endif /* INET6 */ 909 tp = intotcpcb(inp); 910 TCPDEBUG1(); 911 if (control) { 912 /* TCP doesn't do control messages (rights, creds, etc) */ 913 if (control->m_len) { 914 m_freem(control); 915 if (m) 916 m_freem(m); 917 error = EINVAL; 918 goto out; 919 } 920 m_freem(control); /* empty control, just free it */ 921 } 922 if (!(flags & PRUS_OOB)) { 923 sbappendstream(&so->so_snd, m, flags); 924 if (nam && tp->t_state < TCPS_SYN_SENT) { 925 /* 926 * Do implied connect if not yet connected, 927 * initialize window to default value, and 928 * initialize maxseg using peer's cached MSS. 929 */ 930#ifdef INET6 931 if (isipv6) 932 error = tcp6_connect(tp, nam, td); 933#endif /* INET6 */ 934#if defined(INET6) && defined(INET) 935 else 936#endif 937#ifdef INET 938 error = tcp_connect(tp, nam, td); 939#endif 940 if (error) 941 goto out; 942 tp->snd_wnd = TTCP_CLIENT_SND_WND; 943 tcp_mss(tp, -1); 944 } 945 if (flags & PRUS_EOF) { 946 /* 947 * Close the send side of the connection after 948 * the data is sent. 949 */ 950 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 951 socantsendmore(so); 952 tcp_usrclosed(tp); 953 } 954 if (!(inp->inp_flags & INP_DROPPED) && 955 !(flags & PRUS_NOTREADY)) { 956 if (flags & PRUS_MORETOCOME) 957 tp->t_flags |= TF_MORETOCOME; 958 error = tp->t_fb->tfb_tcp_output(tp); 959 if (flags & PRUS_MORETOCOME) 960 tp->t_flags &= ~TF_MORETOCOME; 961 } 962 } else { 963 /* 964 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 965 */ 966 SOCKBUF_LOCK(&so->so_snd); 967 if (sbspace(&so->so_snd) < -512) { 968 SOCKBUF_UNLOCK(&so->so_snd); 969 m_freem(m); 970 error = ENOBUFS; 971 goto out; 972 } 973 /* 974 * According to RFC961 (Assigned Protocols), 975 * the urgent pointer points to the last octet 976 * of urgent data. We continue, however, 977 * to consider it to indicate the first octet 978 * of data past the urgent section. 979 * Otherwise, snd_up should be one lower. 980 */ 981 sbappendstream_locked(&so->so_snd, m, flags); 982 SOCKBUF_UNLOCK(&so->so_snd); 983 if (nam && tp->t_state < TCPS_SYN_SENT) { 984 /* 985 * Do implied connect if not yet connected, 986 * initialize window to default value, and 987 * initialize maxseg using peer's cached MSS. 988 */ 989#ifdef INET6 990 if (isipv6) 991 error = tcp6_connect(tp, nam, td); 992#endif /* INET6 */ 993#if defined(INET6) && defined(INET) 994 else 995#endif 996#ifdef INET 997 error = tcp_connect(tp, nam, td); 998#endif 999 if (error) 1000 goto out; 1001 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1002 tcp_mss(tp, -1); 1003 } 1004 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1005 if (!(flags & PRUS_NOTREADY)) { 1006 tp->t_flags |= TF_FORCEDATA; 1007 error = tp->t_fb->tfb_tcp_output(tp); 1008 tp->t_flags &= ~TF_FORCEDATA; 1009 } 1010 } 1011out: 1012 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1013 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1014 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1015 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1016 INP_WUNLOCK(inp); 1017 if (flags & PRUS_EOF) 1018 INP_INFO_RUNLOCK(&V_tcbinfo); 1019 return (error); 1020} 1021 1022static int 1023tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1024{ 1025 struct inpcb *inp; 1026 struct tcpcb *tp; 1027 int error; 1028 1029 inp = sotoinpcb(so); 1030 INP_WLOCK(inp); 1031 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1032 INP_WUNLOCK(inp); 1033 for (int i = 0; i < count; i++) 1034 m = m_free(m); 1035 return (ECONNRESET); 1036 } 1037 tp = intotcpcb(inp); 1038 1039 SOCKBUF_LOCK(&so->so_snd); 1040 error = sbready(&so->so_snd, m, count); 1041 SOCKBUF_UNLOCK(&so->so_snd); 1042 if (error == 0) 1043 error = tp->t_fb->tfb_tcp_output(tp); 1044 INP_WUNLOCK(inp); 1045 1046 return (error); 1047} 1048 1049/* 1050 * Abort the TCP. Drop the connection abruptly. 1051 */ 1052static void 1053tcp_usr_abort(struct socket *so) 1054{ 1055 struct inpcb *inp; 1056 struct tcpcb *tp = NULL; 1057 TCPDEBUG0; 1058 1059 inp = sotoinpcb(so); 1060 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1061 1062 INP_INFO_RLOCK(&V_tcbinfo); 1063 INP_WLOCK(inp); 1064 KASSERT(inp->inp_socket != NULL, 1065 ("tcp_usr_abort: inp_socket == NULL")); 1066 1067 /* 1068 * If we still have full TCP state, and we're not dropped, drop. 1069 */ 1070 if (!(inp->inp_flags & INP_TIMEWAIT) && 1071 !(inp->inp_flags & INP_DROPPED)) { 1072 tp = intotcpcb(inp); 1073 TCPDEBUG1(); 1074 tcp_drop(tp, ECONNABORTED); 1075 TCPDEBUG2(PRU_ABORT); 1076 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1077 } 1078 if (!(inp->inp_flags & INP_DROPPED)) { 1079 SOCK_LOCK(so); 1080 so->so_state |= SS_PROTOREF; 1081 SOCK_UNLOCK(so); 1082 inp->inp_flags |= INP_SOCKREF; 1083 } 1084 INP_WUNLOCK(inp); 1085 INP_INFO_RUNLOCK(&V_tcbinfo); 1086} 1087 1088/* 1089 * TCP socket is closed. Start friendly disconnect. 1090 */ 1091static void 1092tcp_usr_close(struct socket *so) 1093{ 1094 struct inpcb *inp; 1095 struct tcpcb *tp = NULL; 1096 TCPDEBUG0; 1097 1098 inp = sotoinpcb(so); 1099 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1100 1101 INP_INFO_RLOCK(&V_tcbinfo); 1102 INP_WLOCK(inp); 1103 KASSERT(inp->inp_socket != NULL, 1104 ("tcp_usr_close: inp_socket == NULL")); 1105 1106 /* 1107 * If we still have full TCP state, and we're not dropped, initiate 1108 * a disconnect. 1109 */ 1110 if (!(inp->inp_flags & INP_TIMEWAIT) && 1111 !(inp->inp_flags & INP_DROPPED)) { 1112 tp = intotcpcb(inp); 1113 TCPDEBUG1(); 1114 tcp_disconnect(tp); 1115 TCPDEBUG2(PRU_CLOSE); 1116 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1117 } 1118 if (!(inp->inp_flags & INP_DROPPED)) { 1119 SOCK_LOCK(so); 1120 so->so_state |= SS_PROTOREF; 1121 SOCK_UNLOCK(so); 1122 inp->inp_flags |= INP_SOCKREF; 1123 } 1124 INP_WUNLOCK(inp); 1125 INP_INFO_RUNLOCK(&V_tcbinfo); 1126} 1127 1128/* 1129 * Receive out-of-band data. 1130 */ 1131static int 1132tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1133{ 1134 int error = 0; 1135 struct inpcb *inp; 1136 struct tcpcb *tp = NULL; 1137 1138 TCPDEBUG0; 1139 inp = sotoinpcb(so); 1140 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1141 INP_WLOCK(inp); 1142 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1143 error = ECONNRESET; 1144 goto out; 1145 } 1146 tp = intotcpcb(inp); 1147 TCPDEBUG1(); 1148 if ((so->so_oobmark == 0 && 1149 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1150 so->so_options & SO_OOBINLINE || 1151 tp->t_oobflags & TCPOOB_HADDATA) { 1152 error = EINVAL; 1153 goto out; 1154 } 1155 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1156 error = EWOULDBLOCK; 1157 goto out; 1158 } 1159 m->m_len = 1; 1160 *mtod(m, caddr_t) = tp->t_iobc; 1161 if ((flags & MSG_PEEK) == 0) 1162 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1163 1164out: 1165 TCPDEBUG2(PRU_RCVOOB); 1166 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1167 INP_WUNLOCK(inp); 1168 return (error); 1169} 1170 1171#ifdef INET 1172struct pr_usrreqs tcp_usrreqs = { 1173 .pru_abort = tcp_usr_abort, 1174 .pru_accept = tcp_usr_accept, 1175 .pru_attach = tcp_usr_attach, 1176 .pru_bind = tcp_usr_bind, 1177 .pru_connect = tcp_usr_connect, 1178 .pru_control = in_control, 1179 .pru_detach = tcp_usr_detach, 1180 .pru_disconnect = tcp_usr_disconnect, 1181 .pru_listen = tcp_usr_listen, 1182 .pru_peeraddr = in_getpeeraddr, 1183 .pru_rcvd = tcp_usr_rcvd, 1184 .pru_rcvoob = tcp_usr_rcvoob, 1185 .pru_send = tcp_usr_send, 1186 .pru_ready = tcp_usr_ready, 1187 .pru_shutdown = tcp_usr_shutdown, 1188 .pru_sockaddr = in_getsockaddr, 1189 .pru_sosetlabel = in_pcbsosetlabel, 1190 .pru_close = tcp_usr_close, 1191}; 1192#endif /* INET */ 1193 1194#ifdef INET6 1195struct pr_usrreqs tcp6_usrreqs = { 1196 .pru_abort = tcp_usr_abort, 1197 .pru_accept = tcp6_usr_accept, 1198 .pru_attach = tcp_usr_attach, 1199 .pru_bind = tcp6_usr_bind, 1200 .pru_connect = tcp6_usr_connect, 1201 .pru_control = in6_control, 1202 .pru_detach = tcp_usr_detach, 1203 .pru_disconnect = tcp_usr_disconnect, 1204 .pru_listen = tcp6_usr_listen, 1205 .pru_peeraddr = in6_mapped_peeraddr, 1206 .pru_rcvd = tcp_usr_rcvd, 1207 .pru_rcvoob = tcp_usr_rcvoob, 1208 .pru_send = tcp_usr_send, 1209 .pru_ready = tcp_usr_ready, 1210 .pru_shutdown = tcp_usr_shutdown, 1211 .pru_sockaddr = in6_mapped_sockaddr, 1212 .pru_sosetlabel = in_pcbsosetlabel, 1213 .pru_close = tcp_usr_close, 1214}; 1215#endif /* INET6 */ 1216 1217#ifdef INET 1218/* 1219 * Common subroutine to open a TCP connection to remote host specified 1220 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1221 * port number if needed. Call in_pcbconnect_setup to do the routing and 1222 * to choose a local host address (interface). If there is an existing 1223 * incarnation of the same connection in TIME-WAIT state and if the remote 1224 * host was sending CC options and if the connection duration was < MSL, then 1225 * truncate the previous TIME-WAIT state and proceed. 1226 * Initialize connection parameters and enter SYN-SENT state. 1227 */ 1228static int 1229tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1230{ 1231 struct inpcb *inp = tp->t_inpcb, *oinp; 1232 struct socket *so = inp->inp_socket; 1233 struct in_addr laddr; 1234 u_short lport; 1235 int error; 1236 1237 INP_WLOCK_ASSERT(inp); 1238 INP_HASH_WLOCK(&V_tcbinfo); 1239 1240 if (inp->inp_lport == 0) { 1241 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1242 if (error) 1243 goto out; 1244 } 1245 1246 /* 1247 * Cannot simply call in_pcbconnect, because there might be an 1248 * earlier incarnation of this same connection still in 1249 * TIME_WAIT state, creating an ADDRINUSE error. 1250 */ 1251 laddr = inp->inp_laddr; 1252 lport = inp->inp_lport; 1253 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1254 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1255 if (error && oinp == NULL) 1256 goto out; 1257 if (oinp) { 1258 error = EADDRINUSE; 1259 goto out; 1260 } 1261 inp->inp_laddr = laddr; 1262 in_pcbrehash(inp); 1263 INP_HASH_WUNLOCK(&V_tcbinfo); 1264 1265 /* 1266 * Compute window scaling to request: 1267 * Scale to fit into sweet spot. See tcp_syncache.c. 1268 * XXX: This should move to tcp_output(). 1269 */ 1270 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1271 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1272 tp->request_r_scale++; 1273 1274 soisconnecting(so); 1275 TCPSTAT_INC(tcps_connattempt); 1276 tcp_state_change(tp, TCPS_SYN_SENT); 1277 tp->iss = tcp_new_isn(tp); 1278 tcp_sendseqinit(tp); 1279 1280 return 0; 1281 1282out: 1283 INP_HASH_WUNLOCK(&V_tcbinfo); 1284 return (error); 1285} 1286#endif /* INET */ 1287 1288#ifdef INET6 1289static int 1290tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1291{ 1292 struct inpcb *inp = tp->t_inpcb; 1293 int error; 1294 1295 INP_WLOCK_ASSERT(inp); 1296 INP_HASH_WLOCK(&V_tcbinfo); 1297 1298 if (inp->inp_lport == 0) { 1299 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1300 if (error) 1301 goto out; 1302 } 1303 error = in6_pcbconnect(inp, nam, td->td_ucred); 1304 if (error != 0) 1305 goto out; 1306 INP_HASH_WUNLOCK(&V_tcbinfo); 1307 1308 /* Compute window scaling to request. */ 1309 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1310 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1311 tp->request_r_scale++; 1312 1313 soisconnecting(inp->inp_socket); 1314 TCPSTAT_INC(tcps_connattempt); 1315 tcp_state_change(tp, TCPS_SYN_SENT); 1316 tp->iss = tcp_new_isn(tp); 1317 tcp_sendseqinit(tp); 1318 1319 return 0; 1320 1321out: 1322 INP_HASH_WUNLOCK(&V_tcbinfo); 1323 return error; 1324} 1325#endif /* INET6 */ 1326 1327/* 1328 * Export TCP internal state information via a struct tcp_info, based on the 1329 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1330 * (TCP state machine, etc). We export all information using FreeBSD-native 1331 * constants -- for example, the numeric values for tcpi_state will differ 1332 * from Linux. 1333 */ 1334static void 1335tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1336{ 1337 1338 INP_WLOCK_ASSERT(tp->t_inpcb); 1339 bzero(ti, sizeof(*ti)); 1340 1341 ti->tcpi_state = tp->t_state; 1342 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1343 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1344 if (tp->t_flags & TF_SACK_PERMIT) 1345 ti->tcpi_options |= TCPI_OPT_SACK; 1346 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1347 ti->tcpi_options |= TCPI_OPT_WSCALE; 1348 ti->tcpi_snd_wscale = tp->snd_scale; 1349 ti->tcpi_rcv_wscale = tp->rcv_scale; 1350 } 1351 if (tp->t_flags & TF_ECN_PERMIT) 1352 ti->tcpi_options |= TCPI_OPT_ECN; 1353 1354 ti->tcpi_rto = tp->t_rxtcur * tick; 1355 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1356 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1357 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1358 1359 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1360 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1361 1362 /* 1363 * FreeBSD-specific extension fields for tcp_info. 1364 */ 1365 ti->tcpi_rcv_space = tp->rcv_wnd; 1366 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1367 ti->tcpi_snd_wnd = tp->snd_wnd; 1368 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1369 ti->tcpi_snd_nxt = tp->snd_nxt; 1370 ti->tcpi_snd_mss = tp->t_maxseg; 1371 ti->tcpi_rcv_mss = tp->t_maxseg; 1372 if (tp->t_flags & TF_TOE) 1373 ti->tcpi_options |= TCPI_OPT_TOE; 1374 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1375 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1376 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1377} 1378 1379/* 1380 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1381 * socket option arguments. When it re-acquires the lock after the copy, it 1382 * has to revalidate that the connection is still valid for the socket 1383 * option. 1384 */ 1385#define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1386 INP_WLOCK(inp); \ 1387 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1388 INP_WUNLOCK(inp); \ 1389 cleanup; \ 1390 return (ECONNRESET); \ 1391 } \ 1392 tp = intotcpcb(inp); \ 1393} while(0) 1394#define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1395 1396int 1397tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1398{ 1399 int error; 1400 struct inpcb *inp; 1401 struct tcpcb *tp; 1402 struct tcp_function_block *blk; 1403 struct tcp_function_set fsn; 1404 1405 error = 0; 1406 inp = sotoinpcb(so); 1407 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1408 INP_WLOCK(inp); 1409 if (sopt->sopt_level != IPPROTO_TCP) { 1410#ifdef INET6 1411 if (inp->inp_vflag & INP_IPV6PROTO) { 1412 INP_WUNLOCK(inp); 1413 error = ip6_ctloutput(so, sopt); 1414 } 1415#endif /* INET6 */ 1416#if defined(INET6) && defined(INET) 1417 else 1418#endif 1419#ifdef INET 1420 { 1421 INP_WUNLOCK(inp); 1422 error = ip_ctloutput(so, sopt); 1423 } 1424#endif 1425 return (error); 1426 } 1427 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1428 INP_WUNLOCK(inp); 1429 return (ECONNRESET); 1430 } 1431 tp = intotcpcb(inp); 1432 /* 1433 * Protect the TCP option TCP_FUNCTION_BLK so 1434 * that a sub-function can *never* overwrite this. 1435 */ 1436 if ((sopt->sopt_dir == SOPT_SET) && 1437 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1438 INP_WUNLOCK(inp); 1439 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1440 sizeof fsn); 1441 if (error) 1442 return (error); 1443 INP_WLOCK_RECHECK(inp); 1444 if (tp->t_state != TCPS_CLOSED) { 1445 /* 1446 * The user has advanced the state 1447 * past the initial point, we can't 1448 * switch since we are down the road 1449 * and a new set of functions may 1450 * not be compatibile. 1451 */ 1452 INP_WUNLOCK(inp); 1453 return(EINVAL); 1454 } 1455 blk = find_and_ref_tcp_functions(&fsn); 1456 if (blk == NULL) { 1457 INP_WUNLOCK(inp); 1458 return (ENOENT); 1459 } 1460 if (tp->t_fb != blk) { 1461 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1462 refcount_release(&blk->tfb_refcnt); 1463 INP_WUNLOCK(inp); 1464 return (ENOENT); 1465 } 1466 /* 1467 * Release the old refcnt, the 1468 * lookup acquires a ref on the 1469 * new one. 1470 */ 1471 if (tp->t_fb->tfb_tcp_fb_fini) 1472 (*tp->t_fb->tfb_tcp_fb_fini)(tp); 1473 refcount_release(&tp->t_fb->tfb_refcnt); 1474 tp->t_fb = blk; 1475 if (tp->t_fb->tfb_tcp_fb_init) { 1476 (*tp->t_fb->tfb_tcp_fb_init)(tp); 1477 } 1478 } 1479#ifdef TCP_OFFLOAD 1480 if (tp->t_flags & TF_TOE) { 1481 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1482 sopt->sopt_name); 1483 } 1484#endif 1485 INP_WUNLOCK(inp); 1486 return (error); 1487 } else if ((sopt->sopt_dir == SOPT_GET) && 1488 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1489 strcpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name); 1490 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1491 INP_WUNLOCK(inp); 1492 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1493 return (error); 1494 } 1495 /* Pass in the INP locked, called must unlock it */ 1496 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1497} 1498 1499int 1500tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1501{ 1502 int error, opt, optval; 1503 u_int ui; 1504 struct tcp_info ti; 1505 struct cc_algo *algo; 1506 char *pbuf, buf[TCP_CA_NAME_MAX]; 1507 size_t len; 1508 1509 /* 1510 * For TCP_CCALGOOPT forward the control to CC module, for both 1511 * SOPT_SET and SOPT_GET. 1512 */ 1513 switch (sopt->sopt_name) { 1514 case TCP_CCALGOOPT: 1515 INP_WUNLOCK(inp); 1516 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1517 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1518 sopt->sopt_valsize); 1519 if (error) { 1520 free(pbuf, M_TEMP); 1521 return (error); 1522 } 1523 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1524 if (CC_ALGO(tp)->ctl_output != NULL) 1525 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1526 else 1527 error = ENOENT; 1528 INP_WUNLOCK(inp); 1529 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1530 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1531 free(pbuf, M_TEMP); 1532 return (error); 1533 } 1534 1535 switch (sopt->sopt_dir) { 1536 case SOPT_SET: 1537 switch (sopt->sopt_name) { 1538#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1539 case TCP_MD5SIG: 1540 if (!TCPMD5_ENABLED()) { 1541 INP_WUNLOCK(inp); 1542 return (ENOPROTOOPT); 1543 } 1544 error = TCPMD5_PCBCTL(inp, sopt); 1545 if (error) 1546 return (error); 1547 goto unlock_and_done; 1548#endif /* IPSEC */ 1549 1550 case TCP_NODELAY: 1551 case TCP_NOOPT: 1552 INP_WUNLOCK(inp); 1553 error = sooptcopyin(sopt, &optval, sizeof optval, 1554 sizeof optval); 1555 if (error) 1556 return (error); 1557 1558 INP_WLOCK_RECHECK(inp); 1559 switch (sopt->sopt_name) { 1560 case TCP_NODELAY: 1561 opt = TF_NODELAY; 1562 break; 1563 case TCP_NOOPT: 1564 opt = TF_NOOPT; 1565 break; 1566 default: 1567 opt = 0; /* dead code to fool gcc */ 1568 break; 1569 } 1570 1571 if (optval) 1572 tp->t_flags |= opt; 1573 else 1574 tp->t_flags &= ~opt; 1575unlock_and_done: 1576#ifdef TCP_OFFLOAD 1577 if (tp->t_flags & TF_TOE) { 1578 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1579 sopt->sopt_name); 1580 } 1581#endif 1582 INP_WUNLOCK(inp); 1583 break; 1584 1585 case TCP_NOPUSH: 1586 INP_WUNLOCK(inp); 1587 error = sooptcopyin(sopt, &optval, sizeof optval, 1588 sizeof optval); 1589 if (error) 1590 return (error); 1591 1592 INP_WLOCK_RECHECK(inp); 1593 if (optval) 1594 tp->t_flags |= TF_NOPUSH; 1595 else if (tp->t_flags & TF_NOPUSH) { 1596 tp->t_flags &= ~TF_NOPUSH; 1597 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1598 error = tp->t_fb->tfb_tcp_output(tp); 1599 } 1600 goto unlock_and_done; 1601 1602 case TCP_MAXSEG: 1603 INP_WUNLOCK(inp); 1604 error = sooptcopyin(sopt, &optval, sizeof optval, 1605 sizeof optval); 1606 if (error) 1607 return (error); 1608 1609 INP_WLOCK_RECHECK(inp); 1610 if (optval > 0 && optval <= tp->t_maxseg && 1611 optval + 40 >= V_tcp_minmss) 1612 tp->t_maxseg = optval; 1613 else 1614 error = EINVAL; 1615 goto unlock_and_done; 1616 1617 case TCP_INFO: 1618 INP_WUNLOCK(inp); 1619 error = EINVAL; 1620 break; 1621 1622 case TCP_CONGESTION: 1623 INP_WUNLOCK(inp); 1624 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1625 if (error) 1626 break; 1627 buf[sopt->sopt_valsize] = '\0'; 1628 INP_WLOCK_RECHECK(inp); 1629 CC_LIST_RLOCK(); 1630 STAILQ_FOREACH(algo, &cc_list, entries) 1631 if (strncmp(buf, algo->name, 1632 TCP_CA_NAME_MAX) == 0) 1633 break; 1634 CC_LIST_RUNLOCK(); 1635 if (algo == NULL) { 1636 INP_WUNLOCK(inp); 1637 error = EINVAL; 1638 break; 1639 } 1640 /* 1641 * We hold a write lock over the tcb so it's safe to 1642 * do these things without ordering concerns. 1643 */ 1644 if (CC_ALGO(tp)->cb_destroy != NULL) 1645 CC_ALGO(tp)->cb_destroy(tp->ccv); 1646 CC_ALGO(tp) = algo; 1647 /* 1648 * If something goes pear shaped initialising the new 1649 * algo, fall back to newreno (which does not 1650 * require initialisation). 1651 */ 1652 if (algo->cb_init != NULL && 1653 algo->cb_init(tp->ccv) != 0) { 1654 CC_ALGO(tp) = &newreno_cc_algo; 1655 /* 1656 * The only reason init should fail is 1657 * because of malloc. 1658 */ 1659 error = ENOMEM; 1660 } 1661 INP_WUNLOCK(inp); 1662 break; 1663 1664 case TCP_KEEPIDLE: 1665 case TCP_KEEPINTVL: 1666 case TCP_KEEPINIT: 1667 INP_WUNLOCK(inp); 1668 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1669 if (error) 1670 return (error); 1671 1672 if (ui > (UINT_MAX / hz)) { 1673 error = EINVAL; 1674 break; 1675 } 1676 ui *= hz; 1677 1678 INP_WLOCK_RECHECK(inp); 1679 switch (sopt->sopt_name) { 1680 case TCP_KEEPIDLE: 1681 tp->t_keepidle = ui; 1682 /* 1683 * XXX: better check current remaining 1684 * timeout and "merge" it with new value. 1685 */ 1686 if ((tp->t_state > TCPS_LISTEN) && 1687 (tp->t_state <= TCPS_CLOSING)) 1688 tcp_timer_activate(tp, TT_KEEP, 1689 TP_KEEPIDLE(tp)); 1690 break; 1691 case TCP_KEEPINTVL: 1692 tp->t_keepintvl = ui; 1693 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1694 (TP_MAXIDLE(tp) > 0)) 1695 tcp_timer_activate(tp, TT_2MSL, 1696 TP_MAXIDLE(tp)); 1697 break; 1698 case TCP_KEEPINIT: 1699 tp->t_keepinit = ui; 1700 if (tp->t_state == TCPS_SYN_RECEIVED || 1701 tp->t_state == TCPS_SYN_SENT) 1702 tcp_timer_activate(tp, TT_KEEP, 1703 TP_KEEPINIT(tp)); 1704 break; 1705 } 1706 goto unlock_and_done; 1707 1708 case TCP_KEEPCNT: 1709 INP_WUNLOCK(inp); 1710 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1711 if (error) 1712 return (error); 1713 1714 INP_WLOCK_RECHECK(inp); 1715 tp->t_keepcnt = ui; 1716 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1717 (TP_MAXIDLE(tp) > 0)) 1718 tcp_timer_activate(tp, TT_2MSL, 1719 TP_MAXIDLE(tp)); 1720 goto unlock_and_done; 1721 1722#ifdef TCPPCAP 1723 case TCP_PCAP_OUT: 1724 case TCP_PCAP_IN: 1725 INP_WUNLOCK(inp); 1726 error = sooptcopyin(sopt, &optval, sizeof optval, 1727 sizeof optval); 1728 if (error) 1729 return (error); 1730 1731 INP_WLOCK_RECHECK(inp); 1732 if (optval >= 0) 1733 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1734 &(tp->t_outpkts) : &(tp->t_inpkts), 1735 optval); 1736 else 1737 error = EINVAL; 1738 goto unlock_and_done; 1739#endif 1740 1741#ifdef TCP_RFC7413 1742 case TCP_FASTOPEN: 1743 INP_WUNLOCK(inp); 1744 if (!V_tcp_fastopen_enabled) 1745 return (EPERM); 1746 1747 error = sooptcopyin(sopt, &optval, sizeof optval, 1748 sizeof optval); 1749 if (error) 1750 return (error); 1751 1752 INP_WLOCK_RECHECK(inp); 1753 if (optval) { 1754 tp->t_flags |= TF_FASTOPEN; 1755 if ((tp->t_state == TCPS_LISTEN) && 1756 (tp->t_tfo_pending == NULL)) 1757 tp->t_tfo_pending = 1758 tcp_fastopen_alloc_counter(); 1759 } else 1760 tp->t_flags &= ~TF_FASTOPEN; 1761 goto unlock_and_done; 1762#endif 1763 1764 default: 1765 INP_WUNLOCK(inp); 1766 error = ENOPROTOOPT; 1767 break; 1768 } 1769 break; 1770 1771 case SOPT_GET: 1772 tp = intotcpcb(inp); 1773 switch (sopt->sopt_name) { 1774#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1775 case TCP_MD5SIG: 1776 if (!TCPMD5_ENABLED()) { 1777 INP_WUNLOCK(inp); 1778 return (ENOPROTOOPT); 1779 } 1780 error = TCPMD5_PCBCTL(inp, sopt); 1781 break; 1782#endif 1783 1784 case TCP_NODELAY: 1785 optval = tp->t_flags & TF_NODELAY; 1786 INP_WUNLOCK(inp); 1787 error = sooptcopyout(sopt, &optval, sizeof optval); 1788 break; 1789 case TCP_MAXSEG: 1790 optval = tp->t_maxseg; 1791 INP_WUNLOCK(inp); 1792 error = sooptcopyout(sopt, &optval, sizeof optval); 1793 break; 1794 case TCP_NOOPT: 1795 optval = tp->t_flags & TF_NOOPT; 1796 INP_WUNLOCK(inp); 1797 error = sooptcopyout(sopt, &optval, sizeof optval); 1798 break; 1799 case TCP_NOPUSH: 1800 optval = tp->t_flags & TF_NOPUSH; 1801 INP_WUNLOCK(inp); 1802 error = sooptcopyout(sopt, &optval, sizeof optval); 1803 break; 1804 case TCP_INFO: 1805 tcp_fill_info(tp, &ti); 1806 INP_WUNLOCK(inp); 1807 error = sooptcopyout(sopt, &ti, sizeof ti); 1808 break; 1809 case TCP_CONGESTION: 1810 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1811 INP_WUNLOCK(inp); 1812 error = sooptcopyout(sopt, buf, len + 1); 1813 break; 1814 case TCP_KEEPIDLE: 1815 case TCP_KEEPINTVL: 1816 case TCP_KEEPINIT: 1817 case TCP_KEEPCNT: 1818 switch (sopt->sopt_name) { 1819 case TCP_KEEPIDLE: 1820 ui = TP_KEEPIDLE(tp) / hz; 1821 break; 1822 case TCP_KEEPINTVL: 1823 ui = TP_KEEPINTVL(tp) / hz; 1824 break; 1825 case TCP_KEEPINIT: 1826 ui = TP_KEEPINIT(tp) / hz; 1827 break; 1828 case TCP_KEEPCNT: 1829 ui = TP_KEEPCNT(tp); 1830 break; 1831 } 1832 INP_WUNLOCK(inp); 1833 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1834 break; 1835#ifdef TCPPCAP 1836 case TCP_PCAP_OUT: 1837 case TCP_PCAP_IN: 1838 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1839 &(tp->t_outpkts) : &(tp->t_inpkts)); 1840 INP_WUNLOCK(inp); 1841 error = sooptcopyout(sopt, &optval, sizeof optval); 1842 break; 1843#endif 1844 1845#ifdef TCP_RFC7413 1846 case TCP_FASTOPEN: 1847 optval = tp->t_flags & TF_FASTOPEN; 1848 INP_WUNLOCK(inp); 1849 error = sooptcopyout(sopt, &optval, sizeof optval); 1850 break; 1851#endif 1852 default: 1853 INP_WUNLOCK(inp); 1854 error = ENOPROTOOPT; 1855 break; 1856 } 1857 break; 1858 } 1859 return (error); 1860} 1861#undef INP_WLOCK_RECHECK 1862#undef INP_WLOCK_RECHECK_CLEANUP 1863 1864/* 1865 * Attach TCP protocol to socket, allocating 1866 * internet protocol control block, tcp control block, 1867 * bufer space, and entering LISTEN state if to accept connections. 1868 */ 1869static int 1870tcp_attach(struct socket *so) 1871{ 1872 struct tcpcb *tp; 1873 struct inpcb *inp; 1874 int error; 1875 1876 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1877 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1878 if (error) 1879 return (error); 1880 } 1881 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1882 so->so_snd.sb_flags |= SB_AUTOSIZE; 1883 INP_INFO_RLOCK(&V_tcbinfo); 1884 error = in_pcballoc(so, &V_tcbinfo); 1885 if (error) { 1886 INP_INFO_RUNLOCK(&V_tcbinfo); 1887 return (error); 1888 } 1889 inp = sotoinpcb(so); 1890#ifdef INET6 1891 if (inp->inp_vflag & INP_IPV6PROTO) { 1892 inp->inp_vflag |= INP_IPV6; 1893 inp->in6p_hops = -1; /* use kernel default */ 1894 } 1895 else 1896#endif 1897 inp->inp_vflag |= INP_IPV4; 1898 tp = tcp_newtcpcb(inp); 1899 if (tp == NULL) { 1900 in_pcbdetach(inp); 1901 in_pcbfree(inp); 1902 INP_INFO_RUNLOCK(&V_tcbinfo); 1903 return (ENOBUFS); 1904 } 1905 tp->t_state = TCPS_CLOSED; 1906 INP_WUNLOCK(inp); 1907 INP_INFO_RUNLOCK(&V_tcbinfo); 1908 TCPSTATES_INC(TCPS_CLOSED); 1909 return (0); 1910} 1911 1912/* 1913 * Initiate (or continue) disconnect. 1914 * If embryonic state, just send reset (once). 1915 * If in ``let data drain'' option and linger null, just drop. 1916 * Otherwise (hard), mark socket disconnecting and drop 1917 * current input data; switch states based on user close, and 1918 * send segment to peer (with FIN). 1919 */ 1920static void 1921tcp_disconnect(struct tcpcb *tp) 1922{ 1923 struct inpcb *inp = tp->t_inpcb; 1924 struct socket *so = inp->inp_socket; 1925 1926 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1927 INP_WLOCK_ASSERT(inp); 1928 1929 /* 1930 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1931 * socket is still open. 1932 */ 1933 if (tp->t_state < TCPS_ESTABLISHED) { 1934 tp = tcp_close(tp); 1935 KASSERT(tp != NULL, 1936 ("tcp_disconnect: tcp_close() returned NULL")); 1937 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1938 tp = tcp_drop(tp, 0); 1939 KASSERT(tp != NULL, 1940 ("tcp_disconnect: tcp_drop() returned NULL")); 1941 } else { 1942 soisdisconnecting(so); 1943 sbflush(&so->so_rcv); 1944 tcp_usrclosed(tp); 1945 if (!(inp->inp_flags & INP_DROPPED)) 1946 tp->t_fb->tfb_tcp_output(tp); 1947 } 1948} 1949 1950/* 1951 * User issued close, and wish to trail through shutdown states: 1952 * if never received SYN, just forget it. If got a SYN from peer, 1953 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1954 * If already got a FIN from peer, then almost done; go to LAST_ACK 1955 * state. In all other cases, have already sent FIN to peer (e.g. 1956 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1957 * for peer to send FIN or not respond to keep-alives, etc. 1958 * We can let the user exit from the close as soon as the FIN is acked. 1959 */ 1960static void 1961tcp_usrclosed(struct tcpcb *tp) 1962{ 1963 1964 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1965 INP_WLOCK_ASSERT(tp->t_inpcb); 1966 1967 switch (tp->t_state) { 1968 case TCPS_LISTEN: 1969#ifdef TCP_OFFLOAD 1970 tcp_offload_listen_stop(tp); 1971#endif 1972 tcp_state_change(tp, TCPS_CLOSED); 1973 /* FALLTHROUGH */ 1974 case TCPS_CLOSED: 1975 tp = tcp_close(tp); 1976 /* 1977 * tcp_close() should never return NULL here as the socket is 1978 * still open. 1979 */ 1980 KASSERT(tp != NULL, 1981 ("tcp_usrclosed: tcp_close() returned NULL")); 1982 break; 1983 1984 case TCPS_SYN_SENT: 1985 case TCPS_SYN_RECEIVED: 1986 tp->t_flags |= TF_NEEDFIN; 1987 break; 1988 1989 case TCPS_ESTABLISHED: 1990 tcp_state_change(tp, TCPS_FIN_WAIT_1); 1991 break; 1992 1993 case TCPS_CLOSE_WAIT: 1994 tcp_state_change(tp, TCPS_LAST_ACK); 1995 break; 1996 } 1997 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1998 soisdisconnected(tp->t_inpcb->inp_socket); 1999 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2000 if (tp->t_state == TCPS_FIN_WAIT_2) { 2001 int timeout; 2002 2003 timeout = (tcp_fast_finwait2_recycle) ? 2004 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2005 tcp_timer_activate(tp, TT_2MSL, timeout); 2006 } 2007 } 2008} 2009 2010#ifdef DDB 2011static void 2012db_print_indent(int indent) 2013{ 2014 int i; 2015 2016 for (i = 0; i < indent; i++) 2017 db_printf(" "); 2018} 2019 2020static void 2021db_print_tstate(int t_state) 2022{ 2023 2024 switch (t_state) { 2025 case TCPS_CLOSED: 2026 db_printf("TCPS_CLOSED"); 2027 return; 2028 2029 case TCPS_LISTEN: 2030 db_printf("TCPS_LISTEN"); 2031 return; 2032 2033 case TCPS_SYN_SENT: 2034 db_printf("TCPS_SYN_SENT"); 2035 return; 2036 2037 case TCPS_SYN_RECEIVED: 2038 db_printf("TCPS_SYN_RECEIVED"); 2039 return; 2040 2041 case TCPS_ESTABLISHED: 2042 db_printf("TCPS_ESTABLISHED"); 2043 return; 2044 2045 case TCPS_CLOSE_WAIT: 2046 db_printf("TCPS_CLOSE_WAIT"); 2047 return; 2048 2049 case TCPS_FIN_WAIT_1: 2050 db_printf("TCPS_FIN_WAIT_1"); 2051 return; 2052 2053 case TCPS_CLOSING: 2054 db_printf("TCPS_CLOSING"); 2055 return; 2056 2057 case TCPS_LAST_ACK: 2058 db_printf("TCPS_LAST_ACK"); 2059 return; 2060 2061 case TCPS_FIN_WAIT_2: 2062 db_printf("TCPS_FIN_WAIT_2"); 2063 return; 2064 2065 case TCPS_TIME_WAIT: 2066 db_printf("TCPS_TIME_WAIT"); 2067 return; 2068 2069 default: 2070 db_printf("unknown"); 2071 return; 2072 } 2073} 2074 2075static void 2076db_print_tflags(u_int t_flags) 2077{ 2078 int comma; 2079 2080 comma = 0; 2081 if (t_flags & TF_ACKNOW) { 2082 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2083 comma = 1; 2084 } 2085 if (t_flags & TF_DELACK) { 2086 db_printf("%sTF_DELACK", comma ? ", " : ""); 2087 comma = 1; 2088 } 2089 if (t_flags & TF_NODELAY) { 2090 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2091 comma = 1; 2092 } 2093 if (t_flags & TF_NOOPT) { 2094 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2095 comma = 1; 2096 } 2097 if (t_flags & TF_SENTFIN) { 2098 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2099 comma = 1; 2100 } 2101 if (t_flags & TF_REQ_SCALE) { 2102 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2103 comma = 1; 2104 } 2105 if (t_flags & TF_RCVD_SCALE) { 2106 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2107 comma = 1; 2108 } 2109 if (t_flags & TF_REQ_TSTMP) { 2110 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2111 comma = 1; 2112 } 2113 if (t_flags & TF_RCVD_TSTMP) { 2114 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2115 comma = 1; 2116 } 2117 if (t_flags & TF_SACK_PERMIT) { 2118 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2119 comma = 1; 2120 } 2121 if (t_flags & TF_NEEDSYN) { 2122 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2123 comma = 1; 2124 } 2125 if (t_flags & TF_NEEDFIN) { 2126 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2127 comma = 1; 2128 } 2129 if (t_flags & TF_NOPUSH) { 2130 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2131 comma = 1; 2132 } 2133 if (t_flags & TF_MORETOCOME) { 2134 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2135 comma = 1; 2136 } 2137 if (t_flags & TF_LQ_OVERFLOW) { 2138 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2139 comma = 1; 2140 } 2141 if (t_flags & TF_LASTIDLE) { 2142 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2143 comma = 1; 2144 } 2145 if (t_flags & TF_RXWIN0SENT) { 2146 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2147 comma = 1; 2148 } 2149 if (t_flags & TF_FASTRECOVERY) { 2150 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2151 comma = 1; 2152 } 2153 if (t_flags & TF_CONGRECOVERY) { 2154 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2155 comma = 1; 2156 } 2157 if (t_flags & TF_WASFRECOVERY) { 2158 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2159 comma = 1; 2160 } 2161 if (t_flags & TF_SIGNATURE) { 2162 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2163 comma = 1; 2164 } 2165 if (t_flags & TF_FORCEDATA) { 2166 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2167 comma = 1; 2168 } 2169 if (t_flags & TF_TSO) { 2170 db_printf("%sTF_TSO", comma ? ", " : ""); 2171 comma = 1; 2172 } 2173 if (t_flags & TF_ECN_PERMIT) { 2174 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2175 comma = 1; 2176 } 2177 if (t_flags & TF_FASTOPEN) { 2178 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2179 comma = 1; 2180 } 2181} 2182 2183static void 2184db_print_toobflags(char t_oobflags) 2185{ 2186 int comma; 2187 2188 comma = 0; 2189 if (t_oobflags & TCPOOB_HAVEDATA) { 2190 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2191 comma = 1; 2192 } 2193 if (t_oobflags & TCPOOB_HADDATA) { 2194 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2195 comma = 1; 2196 } 2197} 2198 2199static void 2200db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2201{ 2202 2203 db_print_indent(indent); 2204 db_printf("%s at %p\n", name, tp); 2205 2206 indent += 2; 2207 2208 db_print_indent(indent); 2209 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2210 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2211 2212 db_print_indent(indent); 2213 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2214 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2215 2216 db_print_indent(indent); 2217 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2218 &tp->t_timers->tt_delack, tp->t_inpcb); 2219 2220 db_print_indent(indent); 2221 db_printf("t_state: %d (", tp->t_state); 2222 db_print_tstate(tp->t_state); 2223 db_printf(")\n"); 2224 2225 db_print_indent(indent); 2226 db_printf("t_flags: 0x%x (", tp->t_flags); 2227 db_print_tflags(tp->t_flags); 2228 db_printf(")\n"); 2229 2230 db_print_indent(indent); 2231 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2232 tp->snd_una, tp->snd_max, tp->snd_nxt); 2233 2234 db_print_indent(indent); 2235 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2236 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2237 2238 db_print_indent(indent); 2239 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2240 tp->iss, tp->irs, tp->rcv_nxt); 2241 2242 db_print_indent(indent); 2243 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2244 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2245 2246 db_print_indent(indent); 2247 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2248 tp->snd_wnd, tp->snd_cwnd); 2249 2250 db_print_indent(indent); 2251 db_printf("snd_ssthresh: %lu snd_recover: " 2252 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2253 2254 db_print_indent(indent); 2255 db_printf("t_rcvtime: %u t_startime: %u\n", 2256 tp->t_rcvtime, tp->t_starttime); 2257 2258 db_print_indent(indent); 2259 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2260 tp->t_rtttime, tp->t_rtseq); 2261 2262 db_print_indent(indent); 2263 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2264 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2265 2266 db_print_indent(indent); 2267 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2268 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2269 tp->t_rttbest); 2270 2271 db_print_indent(indent); 2272 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2273 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2274 2275 db_print_indent(indent); 2276 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2277 db_print_toobflags(tp->t_oobflags); 2278 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2279 2280 db_print_indent(indent); 2281 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2282 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2283 2284 db_print_indent(indent); 2285 db_printf("ts_recent: %u ts_recent_age: %u\n", 2286 tp->ts_recent, tp->ts_recent_age); 2287 2288 db_print_indent(indent); 2289 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2290 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2291 2292 db_print_indent(indent); 2293 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2294 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2295 tp->snd_recover_prev, tp->t_badrxtwin); 2296 2297 db_print_indent(indent); 2298 db_printf("snd_numholes: %d snd_holes first: %p\n", 2299 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2300 2301 db_print_indent(indent); 2302 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2303 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2304 2305 /* Skip sackblks, sackhint. */ 2306 2307 db_print_indent(indent); 2308 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2309 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2310} 2311 2312DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2313{ 2314 struct tcpcb *tp; 2315 2316 if (!have_addr) { 2317 db_printf("usage: show tcpcb <addr>\n"); 2318 return; 2319 } 2320 tp = (struct tcpcb *)addr; 2321 2322 db_print_tcpcb(tp, "tcpcb", 0); 2323} 2324#endif 2325