tcp_usrreq.c revision 309108
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/10/sys/netinet/tcp_usrreq.c 309108 2016-11-24 14:48:46Z jch $"); 40 41#include "opt_ddb.h" 42#include "opt_inet.h" 43#include "opt_inet6.h" 44#include "opt_tcpdebug.h" 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/limits.h> 49#include <sys/malloc.h> 50#include <sys/kernel.h> 51#include <sys/sysctl.h> 52#include <sys/mbuf.h> 53#ifdef INET6 54#include <sys/domain.h> 55#endif /* INET6 */ 56#include <sys/socket.h> 57#include <sys/socketvar.h> 58#include <sys/protosw.h> 59#include <sys/proc.h> 60#include <sys/jail.h> 61#include <sys/syslog.h> 62 63#ifdef DDB 64#include <ddb/ddb.h> 65#endif 66 67#include <net/if.h> 68#include <net/route.h> 69#include <net/vnet.h> 70 71#include <netinet/cc.h> 72#include <netinet/in.h> 73#include <netinet/in_pcb.h> 74#include <netinet/in_systm.h> 75#include <netinet/in_var.h> 76#include <netinet/ip_var.h> 77#ifdef INET6 78#include <netinet/ip6.h> 79#include <netinet6/in6_pcb.h> 80#include <netinet6/ip6_var.h> 81#include <netinet6/scope6_var.h> 82#endif 83#ifdef TCP_RFC7413 84#include <netinet/tcp_fastopen.h> 85#endif 86#include <netinet/tcp_fsm.h> 87#include <netinet/tcp_seq.h> 88#include <netinet/tcp_timer.h> 89#include <netinet/tcp_var.h> 90#include <netinet/tcpip.h> 91#ifdef TCPDEBUG 92#include <netinet/tcp_debug.h> 93#endif 94#ifdef TCP_OFFLOAD 95#include <netinet/tcp_offload.h> 96#endif 97 98/* 99 * TCP protocol interface to socket abstraction. 100 */ 101static int tcp_attach(struct socket *); 102#ifdef INET 103static int tcp_connect(struct tcpcb *, struct sockaddr *, 104 struct thread *td); 105#endif /* INET */ 106#ifdef INET6 107static int tcp6_connect(struct tcpcb *, struct sockaddr *, 108 struct thread *td); 109#endif /* INET6 */ 110static void tcp_disconnect(struct tcpcb *); 111static void tcp_usrclosed(struct tcpcb *); 112static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 113 114#ifdef TCPDEBUG 115#define TCPDEBUG0 int ostate = 0 116#define TCPDEBUG1() ostate = tp ? tp->t_state : 0 117#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 118 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 119#else 120#define TCPDEBUG0 121#define TCPDEBUG1() 122#define TCPDEBUG2(req) 123#endif 124 125/* 126 * TCP attaches to socket via pru_attach(), reserving space, 127 * and an internet control block. 128 */ 129static int 130tcp_usr_attach(struct socket *so, int proto, struct thread *td) 131{ 132 struct inpcb *inp; 133 struct tcpcb *tp = NULL; 134 int error; 135 TCPDEBUG0; 136 137 inp = sotoinpcb(so); 138 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 139 TCPDEBUG1(); 140 141 error = tcp_attach(so); 142 if (error) 143 goto out; 144 145 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 146 so->so_linger = TCP_LINGERTIME; 147 148 inp = sotoinpcb(so); 149 tp = intotcpcb(inp); 150out: 151 TCPDEBUG2(PRU_ATTACH); 152 return error; 153} 154 155/* 156 * tcp_detach is called when the socket layer loses its final reference 157 * to the socket, be it a file descriptor reference, a reference from TCP, 158 * etc. At this point, there is only one case in which we will keep around 159 * inpcb state: time wait. 160 * 161 * This function can probably be re-absorbed back into tcp_usr_detach() now 162 * that there is a single detach path. 163 */ 164static void 165tcp_detach(struct socket *so, struct inpcb *inp) 166{ 167 struct tcpcb *tp; 168 169 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 170 INP_WLOCK_ASSERT(inp); 171 172 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 173 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 174 175 tp = intotcpcb(inp); 176 177 if (inp->inp_flags & INP_TIMEWAIT) { 178 /* 179 * There are two cases to handle: one in which the time wait 180 * state is being discarded (INP_DROPPED), and one in which 181 * this connection will remain in timewait. In the former, 182 * it is time to discard all state (except tcptw, which has 183 * already been discarded by the timewait close code, which 184 * should be further up the call stack somewhere). In the 185 * latter case, we detach from the socket, but leave the pcb 186 * present until timewait ends. 187 * 188 * XXXRW: Would it be cleaner to free the tcptw here? 189 * 190 * Astute question indeed, from twtcp perspective there are 191 * three cases to consider: 192 * 193 * #1 tcp_detach is called at tcptw creation time by 194 * tcp_twstart, then do not discard the newly created tcptw 195 * and leave inpcb present until timewait ends 196 * #2 tcp_detach is called at timewait end (or reuse) by 197 * tcp_twclose, then the tcptw has already been discarded 198 * (or reused) and inpcb is freed here 199 * #3 tcp_detach is called() after timewait ends (or reuse) 200 * (e.g. by soclose), then tcptw has already been discarded 201 * (or reused) and inpcb is freed here 202 * 203 * In all three cases the tcptw should not be freed here. 204 */ 205 if (inp->inp_flags & INP_DROPPED) { 206 in_pcbdetach(inp); 207 if (__predict_true(tp == NULL)) { 208 in_pcbfree(inp); 209 } else { 210 /* 211 * This case should not happen as in TIMEWAIT 212 * state the inp should not be destroyed before 213 * its tcptw. If INVARIANTS is defined, panic. 214 */ 215#ifdef INVARIANTS 216 panic("%s: Panic before an inp double-free: " 217 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 218 , __func__); 219#else 220 log(LOG_ERR, "%s: Avoid an inp double-free: " 221 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 222 , __func__); 223#endif 224 INP_WUNLOCK(inp); 225 } 226 } else { 227 in_pcbdetach(inp); 228 INP_WUNLOCK(inp); 229 } 230 } else { 231 /* 232 * If the connection is not in timewait, we consider two 233 * two conditions: one in which no further processing is 234 * necessary (dropped || embryonic), and one in which TCP is 235 * not yet done, but no longer requires the socket, so the 236 * pcb will persist for the time being. 237 * 238 * XXXRW: Does the second case still occur? 239 */ 240 if (inp->inp_flags & INP_DROPPED || 241 tp->t_state < TCPS_SYN_SENT) { 242 tcp_discardcb(tp); 243 in_pcbdetach(inp); 244 in_pcbfree(inp); 245 } else { 246 in_pcbdetach(inp); 247 INP_WUNLOCK(inp); 248 } 249 } 250} 251 252/* 253 * pru_detach() detaches the TCP protocol from the socket. 254 * If the protocol state is non-embryonic, then can't 255 * do this directly: have to initiate a pru_disconnect(), 256 * which may finish later; embryonic TCB's can just 257 * be discarded here. 258 */ 259static void 260tcp_usr_detach(struct socket *so) 261{ 262 struct inpcb *inp; 263 int rlock = 0; 264 265 inp = sotoinpcb(so); 266 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 267 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 268 INP_INFO_RLOCK(&V_tcbinfo); 269 rlock = 1; 270 } 271 INP_WLOCK(inp); 272 KASSERT(inp->inp_socket != NULL, 273 ("tcp_usr_detach: inp_socket == NULL")); 274 tcp_detach(so, inp); 275 if (rlock) 276 INP_INFO_RUNLOCK(&V_tcbinfo); 277} 278 279#ifdef INET 280/* 281 * Give the socket an address. 282 */ 283static int 284tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 285{ 286 int error = 0; 287 struct inpcb *inp; 288 struct tcpcb *tp = NULL; 289 struct sockaddr_in *sinp; 290 291 sinp = (struct sockaddr_in *)nam; 292 if (nam->sa_len != sizeof (*sinp)) 293 return (EINVAL); 294 /* 295 * Must check for multicast addresses and disallow binding 296 * to them. 297 */ 298 if (sinp->sin_family == AF_INET && 299 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 300 return (EAFNOSUPPORT); 301 302 TCPDEBUG0; 303 inp = sotoinpcb(so); 304 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 305 INP_WLOCK(inp); 306 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 307 error = EINVAL; 308 goto out; 309 } 310 tp = intotcpcb(inp); 311 TCPDEBUG1(); 312 INP_HASH_WLOCK(&V_tcbinfo); 313 error = in_pcbbind(inp, nam, td->td_ucred); 314 INP_HASH_WUNLOCK(&V_tcbinfo); 315out: 316 TCPDEBUG2(PRU_BIND); 317 INP_WUNLOCK(inp); 318 319 return (error); 320} 321#endif /* INET */ 322 323#ifdef INET6 324static int 325tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 326{ 327 int error = 0; 328 struct inpcb *inp; 329 struct tcpcb *tp = NULL; 330 struct sockaddr_in6 *sin6p; 331 332 sin6p = (struct sockaddr_in6 *)nam; 333 if (nam->sa_len != sizeof (*sin6p)) 334 return (EINVAL); 335 /* 336 * Must check for multicast addresses and disallow binding 337 * to them. 338 */ 339 if (sin6p->sin6_family == AF_INET6 && 340 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 341 return (EAFNOSUPPORT); 342 343 TCPDEBUG0; 344 inp = sotoinpcb(so); 345 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 346 INP_WLOCK(inp); 347 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 348 error = EINVAL; 349 goto out; 350 } 351 tp = intotcpcb(inp); 352 TCPDEBUG1(); 353 INP_HASH_WLOCK(&V_tcbinfo); 354 inp->inp_vflag &= ~INP_IPV4; 355 inp->inp_vflag |= INP_IPV6; 356#ifdef INET 357 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 358 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 359 inp->inp_vflag |= INP_IPV4; 360 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 361 struct sockaddr_in sin; 362 363 in6_sin6_2_sin(&sin, sin6p); 364 inp->inp_vflag |= INP_IPV4; 365 inp->inp_vflag &= ~INP_IPV6; 366 error = in_pcbbind(inp, (struct sockaddr *)&sin, 367 td->td_ucred); 368 INP_HASH_WUNLOCK(&V_tcbinfo); 369 goto out; 370 } 371 } 372#endif 373 error = in6_pcbbind(inp, nam, td->td_ucred); 374 INP_HASH_WUNLOCK(&V_tcbinfo); 375out: 376 TCPDEBUG2(PRU_BIND); 377 INP_WUNLOCK(inp); 378 return (error); 379} 380#endif /* INET6 */ 381 382#ifdef INET 383/* 384 * Prepare to accept connections. 385 */ 386static int 387tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 388{ 389 int error = 0; 390 struct inpcb *inp; 391 struct tcpcb *tp = NULL; 392 393 TCPDEBUG0; 394 inp = sotoinpcb(so); 395 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 396 INP_WLOCK(inp); 397 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 398 error = EINVAL; 399 goto out; 400 } 401 tp = intotcpcb(inp); 402 TCPDEBUG1(); 403 SOCK_LOCK(so); 404 error = solisten_proto_check(so); 405 INP_HASH_WLOCK(&V_tcbinfo); 406 if (error == 0 && inp->inp_lport == 0) 407 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 408 INP_HASH_WUNLOCK(&V_tcbinfo); 409 if (error == 0) { 410 tcp_state_change(tp, TCPS_LISTEN); 411 solisten_proto(so, backlog); 412#ifdef TCP_OFFLOAD 413 if ((so->so_options & SO_NO_OFFLOAD) == 0) 414 tcp_offload_listen_start(tp); 415#endif 416 } 417 SOCK_UNLOCK(so); 418 419#ifdef TCP_RFC7413 420 if (tp->t_flags & TF_FASTOPEN) 421 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 422#endif 423out: 424 TCPDEBUG2(PRU_LISTEN); 425 INP_WUNLOCK(inp); 426 return (error); 427} 428#endif /* INET */ 429 430#ifdef INET6 431static int 432tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 433{ 434 int error = 0; 435 struct inpcb *inp; 436 struct tcpcb *tp = NULL; 437 438 TCPDEBUG0; 439 inp = sotoinpcb(so); 440 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 441 INP_WLOCK(inp); 442 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 443 error = EINVAL; 444 goto out; 445 } 446 tp = intotcpcb(inp); 447 TCPDEBUG1(); 448 SOCK_LOCK(so); 449 error = solisten_proto_check(so); 450 INP_HASH_WLOCK(&V_tcbinfo); 451 if (error == 0 && inp->inp_lport == 0) { 452 inp->inp_vflag &= ~INP_IPV4; 453 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 454 inp->inp_vflag |= INP_IPV4; 455 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 456 } 457 INP_HASH_WUNLOCK(&V_tcbinfo); 458 if (error == 0) { 459 tcp_state_change(tp, TCPS_LISTEN); 460 solisten_proto(so, backlog); 461#ifdef TCP_OFFLOAD 462 if ((so->so_options & SO_NO_OFFLOAD) == 0) 463 tcp_offload_listen_start(tp); 464#endif 465 } 466 SOCK_UNLOCK(so); 467 468#ifdef TCP_RFC7413 469 if (tp->t_flags & TF_FASTOPEN) 470 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 471#endif 472out: 473 TCPDEBUG2(PRU_LISTEN); 474 INP_WUNLOCK(inp); 475 return (error); 476} 477#endif /* INET6 */ 478 479#ifdef INET 480/* 481 * Initiate connection to peer. 482 * Create a template for use in transmissions on this connection. 483 * Enter SYN_SENT state, and mark socket as connecting. 484 * Start keep-alive timer, and seed output sequence space. 485 * Send initial segment on connection. 486 */ 487static int 488tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 489{ 490 int error = 0; 491 struct inpcb *inp; 492 struct tcpcb *tp = NULL; 493 struct sockaddr_in *sinp; 494 495 sinp = (struct sockaddr_in *)nam; 496 if (nam->sa_len != sizeof (*sinp)) 497 return (EINVAL); 498 /* 499 * Must disallow TCP ``connections'' to multicast addresses. 500 */ 501 if (sinp->sin_family == AF_INET 502 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 503 return (EAFNOSUPPORT); 504 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 505 return (error); 506 507 TCPDEBUG0; 508 inp = sotoinpcb(so); 509 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 510 INP_WLOCK(inp); 511 if (inp->inp_flags & INP_TIMEWAIT) { 512 error = EADDRINUSE; 513 goto out; 514 } 515 if (inp->inp_flags & INP_DROPPED) { 516 error = ECONNREFUSED; 517 goto out; 518 } 519 tp = intotcpcb(inp); 520 TCPDEBUG1(); 521 if ((error = tcp_connect(tp, nam, td)) != 0) 522 goto out; 523#ifdef TCP_OFFLOAD 524 if (registered_toedevs > 0 && 525 (so->so_options & SO_NO_OFFLOAD) == 0 && 526 (error = tcp_offload_connect(so, nam)) == 0) 527 goto out; 528#endif 529 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 530 error = tcp_output(tp); 531out: 532 TCPDEBUG2(PRU_CONNECT); 533 INP_WUNLOCK(inp); 534 return (error); 535} 536#endif /* INET */ 537 538#ifdef INET6 539static int 540tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 541{ 542 int error = 0; 543 struct inpcb *inp; 544 struct tcpcb *tp = NULL; 545 struct sockaddr_in6 *sin6p; 546 547 TCPDEBUG0; 548 549 sin6p = (struct sockaddr_in6 *)nam; 550 if (nam->sa_len != sizeof (*sin6p)) 551 return (EINVAL); 552 /* 553 * Must disallow TCP ``connections'' to multicast addresses. 554 */ 555 if (sin6p->sin6_family == AF_INET6 556 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 557 return (EAFNOSUPPORT); 558 559 inp = sotoinpcb(so); 560 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 561 INP_WLOCK(inp); 562 if (inp->inp_flags & INP_TIMEWAIT) { 563 error = EADDRINUSE; 564 goto out; 565 } 566 if (inp->inp_flags & INP_DROPPED) { 567 error = ECONNREFUSED; 568 goto out; 569 } 570 tp = intotcpcb(inp); 571 TCPDEBUG1(); 572#ifdef INET 573 /* 574 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 575 * therefore probably require the hash lock, which isn't held here. 576 * Is this a significant problem? 577 */ 578 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 579 struct sockaddr_in sin; 580 581 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 582 error = EINVAL; 583 goto out; 584 } 585 586 in6_sin6_2_sin(&sin, sin6p); 587 inp->inp_vflag |= INP_IPV4; 588 inp->inp_vflag &= ~INP_IPV6; 589 if ((error = prison_remote_ip4(td->td_ucred, 590 &sin.sin_addr)) != 0) 591 goto out; 592 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 593 goto out; 594#ifdef TCP_OFFLOAD 595 if (registered_toedevs > 0 && 596 (so->so_options & SO_NO_OFFLOAD) == 0 && 597 (error = tcp_offload_connect(so, nam)) == 0) 598 goto out; 599#endif 600 error = tcp_output(tp); 601 goto out; 602 } 603#endif 604 inp->inp_vflag &= ~INP_IPV4; 605 inp->inp_vflag |= INP_IPV6; 606 inp->inp_inc.inc_flags |= INC_ISIPV6; 607 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 608 goto out; 609 if ((error = tcp6_connect(tp, nam, td)) != 0) 610 goto out; 611#ifdef TCP_OFFLOAD 612 if (registered_toedevs > 0 && 613 (so->so_options & SO_NO_OFFLOAD) == 0 && 614 (error = tcp_offload_connect(so, nam)) == 0) 615 goto out; 616#endif 617 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 618 error = tcp_output(tp); 619 620out: 621 TCPDEBUG2(PRU_CONNECT); 622 INP_WUNLOCK(inp); 623 return (error); 624} 625#endif /* INET6 */ 626 627/* 628 * Initiate disconnect from peer. 629 * If connection never passed embryonic stage, just drop; 630 * else if don't need to let data drain, then can just drop anyways, 631 * else have to begin TCP shutdown process: mark socket disconnecting, 632 * drain unread data, state switch to reflect user close, and 633 * send segment (e.g. FIN) to peer. Socket will be really disconnected 634 * when peer sends FIN and acks ours. 635 * 636 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 637 */ 638static int 639tcp_usr_disconnect(struct socket *so) 640{ 641 struct inpcb *inp; 642 struct tcpcb *tp = NULL; 643 int error = 0; 644 645 TCPDEBUG0; 646 INP_INFO_RLOCK(&V_tcbinfo); 647 inp = sotoinpcb(so); 648 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 649 INP_WLOCK(inp); 650 if (inp->inp_flags & INP_TIMEWAIT) 651 goto out; 652 if (inp->inp_flags & INP_DROPPED) { 653 error = ECONNRESET; 654 goto out; 655 } 656 tp = intotcpcb(inp); 657 TCPDEBUG1(); 658 tcp_disconnect(tp); 659out: 660 TCPDEBUG2(PRU_DISCONNECT); 661 INP_WUNLOCK(inp); 662 INP_INFO_RUNLOCK(&V_tcbinfo); 663 return (error); 664} 665 666#ifdef INET 667/* 668 * Accept a connection. Essentially all the work is done at higher levels; 669 * just return the address of the peer, storing through addr. 670 */ 671static int 672tcp_usr_accept(struct socket *so, struct sockaddr **nam) 673{ 674 int error = 0; 675 struct inpcb *inp = NULL; 676 struct tcpcb *tp = NULL; 677 struct in_addr addr; 678 in_port_t port = 0; 679 TCPDEBUG0; 680 681 if (so->so_state & SS_ISDISCONNECTED) 682 return (ECONNABORTED); 683 684 inp = sotoinpcb(so); 685 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 686 INP_WLOCK(inp); 687 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 688 error = ECONNABORTED; 689 goto out; 690 } 691 tp = intotcpcb(inp); 692 TCPDEBUG1(); 693 694 /* 695 * We inline in_getpeeraddr and COMMON_END here, so that we can 696 * copy the data of interest and defer the malloc until after we 697 * release the lock. 698 */ 699 port = inp->inp_fport; 700 addr = inp->inp_faddr; 701 702out: 703 TCPDEBUG2(PRU_ACCEPT); 704 INP_WUNLOCK(inp); 705 if (error == 0) 706 *nam = in_sockaddr(port, &addr); 707 return error; 708} 709#endif /* INET */ 710 711#ifdef INET6 712static int 713tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 714{ 715 struct inpcb *inp = NULL; 716 int error = 0; 717 struct tcpcb *tp = NULL; 718 struct in_addr addr; 719 struct in6_addr addr6; 720 in_port_t port = 0; 721 int v4 = 0; 722 TCPDEBUG0; 723 724 if (so->so_state & SS_ISDISCONNECTED) 725 return (ECONNABORTED); 726 727 inp = sotoinpcb(so); 728 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 729 INP_INFO_RLOCK(&V_tcbinfo); 730 INP_WLOCK(inp); 731 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 732 error = ECONNABORTED; 733 goto out; 734 } 735 tp = intotcpcb(inp); 736 TCPDEBUG1(); 737 738 /* 739 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 740 * copy the data of interest and defer the malloc until after we 741 * release the lock. 742 */ 743 if (inp->inp_vflag & INP_IPV4) { 744 v4 = 1; 745 port = inp->inp_fport; 746 addr = inp->inp_faddr; 747 } else { 748 port = inp->inp_fport; 749 addr6 = inp->in6p_faddr; 750 } 751 752out: 753 TCPDEBUG2(PRU_ACCEPT); 754 INP_WUNLOCK(inp); 755 INP_INFO_RUNLOCK(&V_tcbinfo); 756 if (error == 0) { 757 if (v4) 758 *nam = in6_v4mapsin6_sockaddr(port, &addr); 759 else 760 *nam = in6_sockaddr(port, &addr6); 761 } 762 return error; 763} 764#endif /* INET6 */ 765 766/* 767 * Mark the connection as being incapable of further output. 768 */ 769static int 770tcp_usr_shutdown(struct socket *so) 771{ 772 int error = 0; 773 struct inpcb *inp; 774 struct tcpcb *tp = NULL; 775 776 TCPDEBUG0; 777 INP_INFO_RLOCK(&V_tcbinfo); 778 inp = sotoinpcb(so); 779 KASSERT(inp != NULL, ("inp == NULL")); 780 INP_WLOCK(inp); 781 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 782 error = ECONNRESET; 783 goto out; 784 } 785 tp = intotcpcb(inp); 786 TCPDEBUG1(); 787 socantsendmore(so); 788 tcp_usrclosed(tp); 789 if (!(inp->inp_flags & INP_DROPPED)) 790 error = tcp_output(tp); 791 792out: 793 TCPDEBUG2(PRU_SHUTDOWN); 794 INP_WUNLOCK(inp); 795 INP_INFO_RUNLOCK(&V_tcbinfo); 796 797 return (error); 798} 799 800/* 801 * After a receive, possibly send window update to peer. 802 */ 803static int 804tcp_usr_rcvd(struct socket *so, int flags) 805{ 806 struct inpcb *inp; 807 struct tcpcb *tp = NULL; 808 int error = 0; 809 810 TCPDEBUG0; 811 inp = sotoinpcb(so); 812 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 813 INP_WLOCK(inp); 814 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 815 error = ECONNRESET; 816 goto out; 817 } 818 tp = intotcpcb(inp); 819 TCPDEBUG1(); 820#ifdef TCP_RFC7413 821 /* 822 * For passively-created TFO connections, don't attempt a window 823 * update while still in SYN_RECEIVED as this may trigger an early 824 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 825 * application response data, or failing that, when the DELACK timer 826 * expires. 827 */ 828 if ((tp->t_flags & TF_FASTOPEN) && 829 (tp->t_state == TCPS_SYN_RECEIVED)) 830 goto out; 831#endif 832#ifdef TCP_OFFLOAD 833 if (tp->t_flags & TF_TOE) 834 tcp_offload_rcvd(tp); 835 else 836#endif 837 tcp_output(tp); 838 839out: 840 TCPDEBUG2(PRU_RCVD); 841 INP_WUNLOCK(inp); 842 return (error); 843} 844 845/* 846 * Do a send by putting data in output queue and updating urgent 847 * marker if URG set. Possibly send more data. Unlike the other 848 * pru_*() routines, the mbuf chains are our responsibility. We 849 * must either enqueue them or free them. The other pru_* routines 850 * generally are caller-frees. 851 */ 852static int 853tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 854 struct sockaddr *nam, struct mbuf *control, struct thread *td) 855{ 856 int error = 0; 857 struct inpcb *inp; 858 struct tcpcb *tp = NULL; 859#ifdef INET6 860 int isipv6; 861#endif 862 TCPDEBUG0; 863 864 /* 865 * We require the pcbinfo lock if we will close the socket as part of 866 * this call. 867 */ 868 if (flags & PRUS_EOF) 869 INP_INFO_RLOCK(&V_tcbinfo); 870 inp = sotoinpcb(so); 871 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 872 INP_WLOCK(inp); 873 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 874 if (control) 875 m_freem(control); 876 if (m) 877 m_freem(m); 878 error = ECONNRESET; 879 goto out; 880 } 881#ifdef INET6 882 isipv6 = nam && nam->sa_family == AF_INET6; 883#endif /* INET6 */ 884 tp = intotcpcb(inp); 885 TCPDEBUG1(); 886 if (control) { 887 /* TCP doesn't do control messages (rights, creds, etc) */ 888 if (control->m_len) { 889 m_freem(control); 890 if (m) 891 m_freem(m); 892 error = EINVAL; 893 goto out; 894 } 895 m_freem(control); /* empty control, just free it */ 896 } 897 if (!(flags & PRUS_OOB)) { 898 sbappendstream(&so->so_snd, m); 899 if (nam && tp->t_state < TCPS_SYN_SENT) { 900 /* 901 * Do implied connect if not yet connected, 902 * initialize window to default value, and 903 * initialize maxseg/maxopd using peer's cached 904 * MSS. 905 */ 906#ifdef INET6 907 if (isipv6) 908 error = tcp6_connect(tp, nam, td); 909#endif /* INET6 */ 910#if defined(INET6) && defined(INET) 911 else 912#endif 913#ifdef INET 914 error = tcp_connect(tp, nam, td); 915#endif 916 if (error) 917 goto out; 918 tp->snd_wnd = TTCP_CLIENT_SND_WND; 919 tcp_mss(tp, -1); 920 } 921 if (flags & PRUS_EOF) { 922 /* 923 * Close the send side of the connection after 924 * the data is sent. 925 */ 926 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 927 socantsendmore(so); 928 tcp_usrclosed(tp); 929 } 930 if (!(inp->inp_flags & INP_DROPPED)) { 931 if (flags & PRUS_MORETOCOME) 932 tp->t_flags |= TF_MORETOCOME; 933 error = tcp_output(tp); 934 if (flags & PRUS_MORETOCOME) 935 tp->t_flags &= ~TF_MORETOCOME; 936 } 937 } else { 938 /* 939 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 940 */ 941 SOCKBUF_LOCK(&so->so_snd); 942 if (sbspace(&so->so_snd) < -512) { 943 SOCKBUF_UNLOCK(&so->so_snd); 944 m_freem(m); 945 error = ENOBUFS; 946 goto out; 947 } 948 /* 949 * According to RFC961 (Assigned Protocols), 950 * the urgent pointer points to the last octet 951 * of urgent data. We continue, however, 952 * to consider it to indicate the first octet 953 * of data past the urgent section. 954 * Otherwise, snd_up should be one lower. 955 */ 956 sbappendstream_locked(&so->so_snd, m); 957 SOCKBUF_UNLOCK(&so->so_snd); 958 if (nam && tp->t_state < TCPS_SYN_SENT) { 959 /* 960 * Do implied connect if not yet connected, 961 * initialize window to default value, and 962 * initialize maxseg/maxopd using peer's cached 963 * MSS. 964 */ 965#ifdef INET6 966 if (isipv6) 967 error = tcp6_connect(tp, nam, td); 968#endif /* INET6 */ 969#if defined(INET6) && defined(INET) 970 else 971#endif 972#ifdef INET 973 error = tcp_connect(tp, nam, td); 974#endif 975 if (error) 976 goto out; 977 tp->snd_wnd = TTCP_CLIENT_SND_WND; 978 tcp_mss(tp, -1); 979 } 980 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 981 tp->t_flags |= TF_FORCEDATA; 982 error = tcp_output(tp); 983 tp->t_flags &= ~TF_FORCEDATA; 984 } 985out: 986 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 987 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 988 INP_WUNLOCK(inp); 989 if (flags & PRUS_EOF) 990 INP_INFO_RUNLOCK(&V_tcbinfo); 991 return (error); 992} 993 994/* 995 * Abort the TCP. Drop the connection abruptly. 996 */ 997static void 998tcp_usr_abort(struct socket *so) 999{ 1000 struct inpcb *inp; 1001 struct tcpcb *tp = NULL; 1002 TCPDEBUG0; 1003 1004 inp = sotoinpcb(so); 1005 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1006 1007 INP_INFO_RLOCK(&V_tcbinfo); 1008 INP_WLOCK(inp); 1009 KASSERT(inp->inp_socket != NULL, 1010 ("tcp_usr_abort: inp_socket == NULL")); 1011 1012 /* 1013 * If we still have full TCP state, and we're not dropped, drop. 1014 */ 1015 if (!(inp->inp_flags & INP_TIMEWAIT) && 1016 !(inp->inp_flags & INP_DROPPED)) { 1017 tp = intotcpcb(inp); 1018 TCPDEBUG1(); 1019 tcp_drop(tp, ECONNABORTED); 1020 TCPDEBUG2(PRU_ABORT); 1021 } 1022 if (!(inp->inp_flags & INP_DROPPED)) { 1023 SOCK_LOCK(so); 1024 so->so_state |= SS_PROTOREF; 1025 SOCK_UNLOCK(so); 1026 inp->inp_flags |= INP_SOCKREF; 1027 } 1028 INP_WUNLOCK(inp); 1029 INP_INFO_RUNLOCK(&V_tcbinfo); 1030} 1031 1032/* 1033 * TCP socket is closed. Start friendly disconnect. 1034 */ 1035static void 1036tcp_usr_close(struct socket *so) 1037{ 1038 struct inpcb *inp; 1039 struct tcpcb *tp = NULL; 1040 TCPDEBUG0; 1041 1042 inp = sotoinpcb(so); 1043 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1044 1045 INP_INFO_RLOCK(&V_tcbinfo); 1046 INP_WLOCK(inp); 1047 KASSERT(inp->inp_socket != NULL, 1048 ("tcp_usr_close: inp_socket == NULL")); 1049 1050 /* 1051 * If we still have full TCP state, and we're not dropped, initiate 1052 * a disconnect. 1053 */ 1054 if (!(inp->inp_flags & INP_TIMEWAIT) && 1055 !(inp->inp_flags & INP_DROPPED)) { 1056 tp = intotcpcb(inp); 1057 TCPDEBUG1(); 1058 tcp_disconnect(tp); 1059 TCPDEBUG2(PRU_CLOSE); 1060 } 1061 if (!(inp->inp_flags & INP_DROPPED)) { 1062 SOCK_LOCK(so); 1063 so->so_state |= SS_PROTOREF; 1064 SOCK_UNLOCK(so); 1065 inp->inp_flags |= INP_SOCKREF; 1066 } 1067 INP_WUNLOCK(inp); 1068 INP_INFO_RUNLOCK(&V_tcbinfo); 1069} 1070 1071/* 1072 * Receive out-of-band data. 1073 */ 1074static int 1075tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1076{ 1077 int error = 0; 1078 struct inpcb *inp; 1079 struct tcpcb *tp = NULL; 1080 1081 TCPDEBUG0; 1082 inp = sotoinpcb(so); 1083 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1084 INP_WLOCK(inp); 1085 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1086 error = ECONNRESET; 1087 goto out; 1088 } 1089 tp = intotcpcb(inp); 1090 TCPDEBUG1(); 1091 if ((so->so_oobmark == 0 && 1092 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1093 so->so_options & SO_OOBINLINE || 1094 tp->t_oobflags & TCPOOB_HADDATA) { 1095 error = EINVAL; 1096 goto out; 1097 } 1098 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1099 error = EWOULDBLOCK; 1100 goto out; 1101 } 1102 m->m_len = 1; 1103 *mtod(m, caddr_t) = tp->t_iobc; 1104 if ((flags & MSG_PEEK) == 0) 1105 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1106 1107out: 1108 TCPDEBUG2(PRU_RCVOOB); 1109 INP_WUNLOCK(inp); 1110 return (error); 1111} 1112 1113#ifdef INET 1114struct pr_usrreqs tcp_usrreqs = { 1115 .pru_abort = tcp_usr_abort, 1116 .pru_accept = tcp_usr_accept, 1117 .pru_attach = tcp_usr_attach, 1118 .pru_bind = tcp_usr_bind, 1119 .pru_connect = tcp_usr_connect, 1120 .pru_control = in_control, 1121 .pru_detach = tcp_usr_detach, 1122 .pru_disconnect = tcp_usr_disconnect, 1123 .pru_listen = tcp_usr_listen, 1124 .pru_peeraddr = in_getpeeraddr, 1125 .pru_rcvd = tcp_usr_rcvd, 1126 .pru_rcvoob = tcp_usr_rcvoob, 1127 .pru_send = tcp_usr_send, 1128 .pru_shutdown = tcp_usr_shutdown, 1129 .pru_sockaddr = in_getsockaddr, 1130 .pru_sosetlabel = in_pcbsosetlabel, 1131 .pru_close = tcp_usr_close, 1132}; 1133#endif /* INET */ 1134 1135#ifdef INET6 1136struct pr_usrreqs tcp6_usrreqs = { 1137 .pru_abort = tcp_usr_abort, 1138 .pru_accept = tcp6_usr_accept, 1139 .pru_attach = tcp_usr_attach, 1140 .pru_bind = tcp6_usr_bind, 1141 .pru_connect = tcp6_usr_connect, 1142 .pru_control = in6_control, 1143 .pru_detach = tcp_usr_detach, 1144 .pru_disconnect = tcp_usr_disconnect, 1145 .pru_listen = tcp6_usr_listen, 1146 .pru_peeraddr = in6_mapped_peeraddr, 1147 .pru_rcvd = tcp_usr_rcvd, 1148 .pru_rcvoob = tcp_usr_rcvoob, 1149 .pru_send = tcp_usr_send, 1150 .pru_shutdown = tcp_usr_shutdown, 1151 .pru_sockaddr = in6_mapped_sockaddr, 1152 .pru_sosetlabel = in_pcbsosetlabel, 1153 .pru_close = tcp_usr_close, 1154}; 1155#endif /* INET6 */ 1156 1157#ifdef INET 1158/* 1159 * Common subroutine to open a TCP connection to remote host specified 1160 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1161 * port number if needed. Call in_pcbconnect_setup to do the routing and 1162 * to choose a local host address (interface). If there is an existing 1163 * incarnation of the same connection in TIME-WAIT state and if the remote 1164 * host was sending CC options and if the connection duration was < MSL, then 1165 * truncate the previous TIME-WAIT state and proceed. 1166 * Initialize connection parameters and enter SYN-SENT state. 1167 */ 1168static int 1169tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1170{ 1171 struct inpcb *inp = tp->t_inpcb, *oinp; 1172 struct socket *so = inp->inp_socket; 1173 struct in_addr laddr; 1174 u_short lport; 1175 int error; 1176 1177 INP_WLOCK_ASSERT(inp); 1178 INP_HASH_WLOCK(&V_tcbinfo); 1179 1180 if (inp->inp_lport == 0) { 1181 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1182 if (error) 1183 goto out; 1184 } 1185 1186 /* 1187 * Cannot simply call in_pcbconnect, because there might be an 1188 * earlier incarnation of this same connection still in 1189 * TIME_WAIT state, creating an ADDRINUSE error. 1190 */ 1191 laddr = inp->inp_laddr; 1192 lport = inp->inp_lport; 1193 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1194 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1195 if (error && oinp == NULL) 1196 goto out; 1197 if (oinp) { 1198 error = EADDRINUSE; 1199 goto out; 1200 } 1201 inp->inp_laddr = laddr; 1202 in_pcbrehash(inp); 1203 INP_HASH_WUNLOCK(&V_tcbinfo); 1204 1205 /* 1206 * Compute window scaling to request: 1207 * Scale to fit into sweet spot. See tcp_syncache.c. 1208 * XXX: This should move to tcp_output(). 1209 */ 1210 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1211 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1212 tp->request_r_scale++; 1213 1214 soisconnecting(so); 1215 TCPSTAT_INC(tcps_connattempt); 1216 tcp_state_change(tp, TCPS_SYN_SENT); 1217 tp->iss = tcp_new_isn(tp); 1218 tcp_sendseqinit(tp); 1219 1220 return 0; 1221 1222out: 1223 INP_HASH_WUNLOCK(&V_tcbinfo); 1224 return (error); 1225} 1226#endif /* INET */ 1227 1228#ifdef INET6 1229static int 1230tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1231{ 1232 struct inpcb *inp = tp->t_inpcb, *oinp; 1233 struct socket *so = inp->inp_socket; 1234 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1235 struct in6_addr addr6; 1236 int error; 1237 1238 INP_WLOCK_ASSERT(inp); 1239 INP_HASH_WLOCK(&V_tcbinfo); 1240 1241 if (inp->inp_lport == 0) { 1242 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1243 if (error) 1244 goto out; 1245 } 1246 1247 /* 1248 * Cannot simply call in_pcbconnect, because there might be an 1249 * earlier incarnation of this same connection still in 1250 * TIME_WAIT state, creating an ADDRINUSE error. 1251 * in6_pcbladdr() also handles scope zone IDs. 1252 * 1253 * XXXRW: We wouldn't need to expose in6_pcblookup_hash_locked() 1254 * outside of in6_pcb.c if there were an in6_pcbconnect_setup(). 1255 */ 1256 error = in6_pcbladdr(inp, nam, &addr6); 1257 if (error) 1258 goto out; 1259 oinp = in6_pcblookup_hash_locked(inp->inp_pcbinfo, 1260 &sin6->sin6_addr, sin6->sin6_port, 1261 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 1262 ? &addr6 1263 : &inp->in6p_laddr, 1264 inp->inp_lport, 0, NULL); 1265 if (oinp) { 1266 error = EADDRINUSE; 1267 goto out; 1268 } 1269 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1270 inp->in6p_laddr = addr6; 1271 inp->in6p_faddr = sin6->sin6_addr; 1272 inp->inp_fport = sin6->sin6_port; 1273 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 1274 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 1275 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 1276 inp->inp_flow |= 1277 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 1278 in_pcbrehash(inp); 1279 INP_HASH_WUNLOCK(&V_tcbinfo); 1280 1281 /* Compute window scaling to request. */ 1282 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1283 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1284 tp->request_r_scale++; 1285 1286 soisconnecting(so); 1287 TCPSTAT_INC(tcps_connattempt); 1288 tcp_state_change(tp, TCPS_SYN_SENT); 1289 tp->iss = tcp_new_isn(tp); 1290 tcp_sendseqinit(tp); 1291 1292 return 0; 1293 1294out: 1295 INP_HASH_WUNLOCK(&V_tcbinfo); 1296 return error; 1297} 1298#endif /* INET6 */ 1299 1300/* 1301 * Export TCP internal state information via a struct tcp_info, based on the 1302 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1303 * (TCP state machine, etc). We export all information using FreeBSD-native 1304 * constants -- for example, the numeric values for tcpi_state will differ 1305 * from Linux. 1306 */ 1307static void 1308tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1309{ 1310 1311 INP_WLOCK_ASSERT(tp->t_inpcb); 1312 bzero(ti, sizeof(*ti)); 1313 1314 ti->tcpi_state = tp->t_state; 1315 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1316 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1317 if (tp->t_flags & TF_SACK_PERMIT) 1318 ti->tcpi_options |= TCPI_OPT_SACK; 1319 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1320 ti->tcpi_options |= TCPI_OPT_WSCALE; 1321 ti->tcpi_snd_wscale = tp->snd_scale; 1322 ti->tcpi_rcv_wscale = tp->rcv_scale; 1323 } 1324 1325 ti->tcpi_rto = tp->t_rxtcur * tick; 1326 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1327 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1328 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1329 1330 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1331 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1332 1333 /* 1334 * FreeBSD-specific extension fields for tcp_info. 1335 */ 1336 ti->tcpi_rcv_space = tp->rcv_wnd; 1337 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1338 ti->tcpi_snd_wnd = tp->snd_wnd; 1339 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1340 ti->tcpi_snd_nxt = tp->snd_nxt; 1341 ti->tcpi_snd_mss = tp->t_maxseg; 1342 ti->tcpi_rcv_mss = tp->t_maxseg; 1343 if (tp->t_flags & TF_TOE) 1344 ti->tcpi_options |= TCPI_OPT_TOE; 1345 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1346 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1347 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1348} 1349 1350/* 1351 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1352 * socket option arguments. When it re-acquires the lock after the copy, it 1353 * has to revalidate that the connection is still valid for the socket 1354 * option. 1355 */ 1356#define INP_WLOCK_RECHECK(inp) do { \ 1357 INP_WLOCK(inp); \ 1358 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1359 INP_WUNLOCK(inp); \ 1360 return (ECONNRESET); \ 1361 } \ 1362 tp = intotcpcb(inp); \ 1363} while(0) 1364 1365int 1366tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1367{ 1368 int error, opt, optval; 1369 u_int ui; 1370 struct inpcb *inp; 1371 struct tcpcb *tp; 1372 struct tcp_info ti; 1373 char buf[TCP_CA_NAME_MAX]; 1374 struct cc_algo *algo; 1375 1376 error = 0; 1377 inp = sotoinpcb(so); 1378 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1379 INP_WLOCK(inp); 1380 if (sopt->sopt_level != IPPROTO_TCP) { 1381#ifdef INET6 1382 if (inp->inp_vflag & INP_IPV6PROTO) { 1383 INP_WUNLOCK(inp); 1384 error = ip6_ctloutput(so, sopt); 1385 } 1386#endif /* INET6 */ 1387#if defined(INET6) && defined(INET) 1388 else 1389#endif 1390#ifdef INET 1391 { 1392 INP_WUNLOCK(inp); 1393 error = ip_ctloutput(so, sopt); 1394 } 1395#endif 1396 return (error); 1397 } 1398 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1399 INP_WUNLOCK(inp); 1400 return (ECONNRESET); 1401 } 1402 1403 switch (sopt->sopt_dir) { 1404 case SOPT_SET: 1405 switch (sopt->sopt_name) { 1406#ifdef TCP_SIGNATURE 1407 case TCP_MD5SIG: 1408 INP_WUNLOCK(inp); 1409 error = sooptcopyin(sopt, &optval, sizeof optval, 1410 sizeof optval); 1411 if (error) 1412 return (error); 1413 1414 INP_WLOCK_RECHECK(inp); 1415 if (optval > 0) 1416 tp->t_flags |= TF_SIGNATURE; 1417 else 1418 tp->t_flags &= ~TF_SIGNATURE; 1419 goto unlock_and_done; 1420#endif /* TCP_SIGNATURE */ 1421 1422 case TCP_NODELAY: 1423 case TCP_NOOPT: 1424 INP_WUNLOCK(inp); 1425 error = sooptcopyin(sopt, &optval, sizeof optval, 1426 sizeof optval); 1427 if (error) 1428 return (error); 1429 1430 INP_WLOCK_RECHECK(inp); 1431 switch (sopt->sopt_name) { 1432 case TCP_NODELAY: 1433 opt = TF_NODELAY; 1434 break; 1435 case TCP_NOOPT: 1436 opt = TF_NOOPT; 1437 break; 1438 default: 1439 opt = 0; /* dead code to fool gcc */ 1440 break; 1441 } 1442 1443 if (optval) 1444 tp->t_flags |= opt; 1445 else 1446 tp->t_flags &= ~opt; 1447unlock_and_done: 1448#ifdef TCP_OFFLOAD 1449 if (tp->t_flags & TF_TOE) { 1450 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1451 sopt->sopt_name); 1452 } 1453#endif 1454 INP_WUNLOCK(inp); 1455 break; 1456 1457 case TCP_NOPUSH: 1458 INP_WUNLOCK(inp); 1459 error = sooptcopyin(sopt, &optval, sizeof optval, 1460 sizeof optval); 1461 if (error) 1462 return (error); 1463 1464 INP_WLOCK_RECHECK(inp); 1465 if (optval) 1466 tp->t_flags |= TF_NOPUSH; 1467 else if (tp->t_flags & TF_NOPUSH) { 1468 tp->t_flags &= ~TF_NOPUSH; 1469 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1470 error = tcp_output(tp); 1471 } 1472 goto unlock_and_done; 1473 1474 case TCP_MAXSEG: 1475 INP_WUNLOCK(inp); 1476 error = sooptcopyin(sopt, &optval, sizeof optval, 1477 sizeof optval); 1478 if (error) 1479 return (error); 1480 1481 INP_WLOCK_RECHECK(inp); 1482 if (optval > 0 && optval <= tp->t_maxseg && 1483 optval + 40 >= V_tcp_minmss) 1484 tp->t_maxseg = optval; 1485 else 1486 error = EINVAL; 1487 goto unlock_and_done; 1488 1489 case TCP_INFO: 1490 INP_WUNLOCK(inp); 1491 error = EINVAL; 1492 break; 1493 1494 case TCP_CONGESTION: 1495 INP_WUNLOCK(inp); 1496 bzero(buf, sizeof(buf)); 1497 error = sooptcopyin(sopt, &buf, sizeof(buf), 1); 1498 if (error) 1499 break; 1500 INP_WLOCK_RECHECK(inp); 1501 /* 1502 * Return EINVAL if we can't find the requested cc algo. 1503 */ 1504 error = EINVAL; 1505 CC_LIST_RLOCK(); 1506 STAILQ_FOREACH(algo, &cc_list, entries) { 1507 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX) 1508 == 0) { 1509 /* We've found the requested algo. */ 1510 error = 0; 1511 /* 1512 * We hold a write lock over the tcb 1513 * so it's safe to do these things 1514 * without ordering concerns. 1515 */ 1516 if (CC_ALGO(tp)->cb_destroy != NULL) 1517 CC_ALGO(tp)->cb_destroy(tp->ccv); 1518 CC_ALGO(tp) = algo; 1519 /* 1520 * If something goes pear shaped 1521 * initialising the new algo, 1522 * fall back to newreno (which 1523 * does not require initialisation). 1524 */ 1525 if (algo->cb_init != NULL) 1526 if (algo->cb_init(tp->ccv) > 0) { 1527 CC_ALGO(tp) = &newreno_cc_algo; 1528 /* 1529 * The only reason init 1530 * should fail is 1531 * because of malloc. 1532 */ 1533 error = ENOMEM; 1534 } 1535 break; /* Break the STAILQ_FOREACH. */ 1536 } 1537 } 1538 CC_LIST_RUNLOCK(); 1539 goto unlock_and_done; 1540 1541 case TCP_KEEPIDLE: 1542 case TCP_KEEPINTVL: 1543 case TCP_KEEPINIT: 1544 INP_WUNLOCK(inp); 1545 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1546 if (error) 1547 return (error); 1548 1549 if (ui > (UINT_MAX / hz)) { 1550 error = EINVAL; 1551 break; 1552 } 1553 ui *= hz; 1554 1555 INP_WLOCK_RECHECK(inp); 1556 switch (sopt->sopt_name) { 1557 case TCP_KEEPIDLE: 1558 tp->t_keepidle = ui; 1559 /* 1560 * XXX: better check current remaining 1561 * timeout and "merge" it with new value. 1562 */ 1563 if ((tp->t_state > TCPS_LISTEN) && 1564 (tp->t_state <= TCPS_CLOSING)) 1565 tcp_timer_activate(tp, TT_KEEP, 1566 TP_KEEPIDLE(tp)); 1567 break; 1568 case TCP_KEEPINTVL: 1569 tp->t_keepintvl = ui; 1570 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1571 (TP_MAXIDLE(tp) > 0)) 1572 tcp_timer_activate(tp, TT_2MSL, 1573 TP_MAXIDLE(tp)); 1574 break; 1575 case TCP_KEEPINIT: 1576 tp->t_keepinit = ui; 1577 if (tp->t_state == TCPS_SYN_RECEIVED || 1578 tp->t_state == TCPS_SYN_SENT) 1579 tcp_timer_activate(tp, TT_KEEP, 1580 TP_KEEPINIT(tp)); 1581 break; 1582 } 1583 goto unlock_and_done; 1584 1585 case TCP_KEEPCNT: 1586 INP_WUNLOCK(inp); 1587 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1588 if (error) 1589 return (error); 1590 1591 INP_WLOCK_RECHECK(inp); 1592 tp->t_keepcnt = ui; 1593 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1594 (TP_MAXIDLE(tp) > 0)) 1595 tcp_timer_activate(tp, TT_2MSL, 1596 TP_MAXIDLE(tp)); 1597 goto unlock_and_done; 1598 1599#ifdef TCP_RFC7413 1600 case TCP_FASTOPEN: 1601 INP_WUNLOCK(inp); 1602 if (!V_tcp_fastopen_enabled) 1603 return (EPERM); 1604 1605 error = sooptcopyin(sopt, &optval, sizeof optval, 1606 sizeof optval); 1607 if (error) 1608 return (error); 1609 1610 INP_WLOCK_RECHECK(inp); 1611 if (optval) { 1612 tp->t_flags |= TF_FASTOPEN; 1613 if ((tp->t_state == TCPS_LISTEN) && 1614 (tp->t_tfo_pending == NULL)) 1615 tp->t_tfo_pending = 1616 tcp_fastopen_alloc_counter(); 1617 } else 1618 tp->t_flags &= ~TF_FASTOPEN; 1619 goto unlock_and_done; 1620#endif 1621 1622 default: 1623 INP_WUNLOCK(inp); 1624 error = ENOPROTOOPT; 1625 break; 1626 } 1627 break; 1628 1629 case SOPT_GET: 1630 tp = intotcpcb(inp); 1631 switch (sopt->sopt_name) { 1632#ifdef TCP_SIGNATURE 1633 case TCP_MD5SIG: 1634 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1635 INP_WUNLOCK(inp); 1636 error = sooptcopyout(sopt, &optval, sizeof optval); 1637 break; 1638#endif 1639 1640 case TCP_NODELAY: 1641 optval = tp->t_flags & TF_NODELAY; 1642 INP_WUNLOCK(inp); 1643 error = sooptcopyout(sopt, &optval, sizeof optval); 1644 break; 1645 case TCP_MAXSEG: 1646 optval = tp->t_maxseg; 1647 INP_WUNLOCK(inp); 1648 error = sooptcopyout(sopt, &optval, sizeof optval); 1649 break; 1650 case TCP_NOOPT: 1651 optval = tp->t_flags & TF_NOOPT; 1652 INP_WUNLOCK(inp); 1653 error = sooptcopyout(sopt, &optval, sizeof optval); 1654 break; 1655 case TCP_NOPUSH: 1656 optval = tp->t_flags & TF_NOPUSH; 1657 INP_WUNLOCK(inp); 1658 error = sooptcopyout(sopt, &optval, sizeof optval); 1659 break; 1660 case TCP_INFO: 1661 tcp_fill_info(tp, &ti); 1662 INP_WUNLOCK(inp); 1663 error = sooptcopyout(sopt, &ti, sizeof ti); 1664 break; 1665 case TCP_CONGESTION: 1666 bzero(buf, sizeof(buf)); 1667 strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1668 INP_WUNLOCK(inp); 1669 error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX); 1670 break; 1671 case TCP_KEEPIDLE: 1672 case TCP_KEEPINTVL: 1673 case TCP_KEEPINIT: 1674 case TCP_KEEPCNT: 1675 switch (sopt->sopt_name) { 1676 case TCP_KEEPIDLE: 1677 ui = tp->t_keepidle / hz; 1678 break; 1679 case TCP_KEEPINTVL: 1680 ui = tp->t_keepintvl / hz; 1681 break; 1682 case TCP_KEEPINIT: 1683 ui = tp->t_keepinit / hz; 1684 break; 1685 case TCP_KEEPCNT: 1686 ui = tp->t_keepcnt; 1687 break; 1688 } 1689 INP_WUNLOCK(inp); 1690 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1691 break; 1692#ifdef TCP_RFC7413 1693 case TCP_FASTOPEN: 1694 optval = tp->t_flags & TF_FASTOPEN; 1695 INP_WUNLOCK(inp); 1696 error = sooptcopyout(sopt, &optval, sizeof optval); 1697 break; 1698#endif 1699 default: 1700 INP_WUNLOCK(inp); 1701 error = ENOPROTOOPT; 1702 break; 1703 } 1704 break; 1705 } 1706 return (error); 1707} 1708#undef INP_WLOCK_RECHECK 1709 1710/* 1711 * Attach TCP protocol to socket, allocating 1712 * internet protocol control block, tcp control block, 1713 * bufer space, and entering LISTEN state if to accept connections. 1714 */ 1715static int 1716tcp_attach(struct socket *so) 1717{ 1718 struct tcpcb *tp; 1719 struct inpcb *inp; 1720 int error; 1721 1722 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1723 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1724 if (error) 1725 return (error); 1726 } 1727 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1728 so->so_snd.sb_flags |= SB_AUTOSIZE; 1729 INP_INFO_RLOCK(&V_tcbinfo); 1730 error = in_pcballoc(so, &V_tcbinfo); 1731 if (error) { 1732 INP_INFO_RUNLOCK(&V_tcbinfo); 1733 return (error); 1734 } 1735 inp = sotoinpcb(so); 1736#ifdef INET6 1737 if (inp->inp_vflag & INP_IPV6PROTO) { 1738 inp->inp_vflag |= INP_IPV6; 1739 inp->in6p_hops = -1; /* use kernel default */ 1740 } 1741 else 1742#endif 1743 inp->inp_vflag |= INP_IPV4; 1744 tp = tcp_newtcpcb(inp); 1745 if (tp == NULL) { 1746 in_pcbdetach(inp); 1747 in_pcbfree(inp); 1748 INP_INFO_RUNLOCK(&V_tcbinfo); 1749 return (ENOBUFS); 1750 } 1751 tp->t_state = TCPS_CLOSED; 1752 INP_WUNLOCK(inp); 1753 INP_INFO_RUNLOCK(&V_tcbinfo); 1754 return (0); 1755} 1756 1757/* 1758 * Initiate (or continue) disconnect. 1759 * If embryonic state, just send reset (once). 1760 * If in ``let data drain'' option and linger null, just drop. 1761 * Otherwise (hard), mark socket disconnecting and drop 1762 * current input data; switch states based on user close, and 1763 * send segment to peer (with FIN). 1764 */ 1765static void 1766tcp_disconnect(struct tcpcb *tp) 1767{ 1768 struct inpcb *inp = tp->t_inpcb; 1769 struct socket *so = inp->inp_socket; 1770 1771 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1772 INP_WLOCK_ASSERT(inp); 1773 1774 /* 1775 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1776 * socket is still open. 1777 */ 1778 if (tp->t_state < TCPS_ESTABLISHED) { 1779 tp = tcp_close(tp); 1780 KASSERT(tp != NULL, 1781 ("tcp_disconnect: tcp_close() returned NULL")); 1782 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1783 tp = tcp_drop(tp, 0); 1784 KASSERT(tp != NULL, 1785 ("tcp_disconnect: tcp_drop() returned NULL")); 1786 } else { 1787 soisdisconnecting(so); 1788 sbflush(&so->so_rcv); 1789 tcp_usrclosed(tp); 1790 if (!(inp->inp_flags & INP_DROPPED)) 1791 tcp_output(tp); 1792 } 1793} 1794 1795/* 1796 * User issued close, and wish to trail through shutdown states: 1797 * if never received SYN, just forget it. If got a SYN from peer, 1798 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1799 * If already got a FIN from peer, then almost done; go to LAST_ACK 1800 * state. In all other cases, have already sent FIN to peer (e.g. 1801 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1802 * for peer to send FIN or not respond to keep-alives, etc. 1803 * We can let the user exit from the close as soon as the FIN is acked. 1804 */ 1805static void 1806tcp_usrclosed(struct tcpcb *tp) 1807{ 1808 1809 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1810 INP_WLOCK_ASSERT(tp->t_inpcb); 1811 1812 switch (tp->t_state) { 1813 case TCPS_LISTEN: 1814#ifdef TCP_OFFLOAD 1815 tcp_offload_listen_stop(tp); 1816#endif 1817 tcp_state_change(tp, TCPS_CLOSED); 1818 /* FALLTHROUGH */ 1819 case TCPS_CLOSED: 1820 tp = tcp_close(tp); 1821 /* 1822 * tcp_close() should never return NULL here as the socket is 1823 * still open. 1824 */ 1825 KASSERT(tp != NULL, 1826 ("tcp_usrclosed: tcp_close() returned NULL")); 1827 break; 1828 1829 case TCPS_SYN_SENT: 1830 case TCPS_SYN_RECEIVED: 1831 tp->t_flags |= TF_NEEDFIN; 1832 break; 1833 1834 case TCPS_ESTABLISHED: 1835 tcp_state_change(tp, TCPS_FIN_WAIT_1); 1836 break; 1837 1838 case TCPS_CLOSE_WAIT: 1839 tcp_state_change(tp, TCPS_LAST_ACK); 1840 break; 1841 } 1842 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1843 soisdisconnected(tp->t_inpcb->inp_socket); 1844 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1845 if (tp->t_state == TCPS_FIN_WAIT_2) { 1846 int timeout; 1847 1848 timeout = (tcp_fast_finwait2_recycle) ? 1849 tcp_finwait2_timeout : TP_MAXIDLE(tp); 1850 tcp_timer_activate(tp, TT_2MSL, timeout); 1851 } 1852 } 1853} 1854 1855#ifdef DDB 1856static void 1857db_print_indent(int indent) 1858{ 1859 int i; 1860 1861 for (i = 0; i < indent; i++) 1862 db_printf(" "); 1863} 1864 1865static void 1866db_print_tstate(int t_state) 1867{ 1868 1869 switch (t_state) { 1870 case TCPS_CLOSED: 1871 db_printf("TCPS_CLOSED"); 1872 return; 1873 1874 case TCPS_LISTEN: 1875 db_printf("TCPS_LISTEN"); 1876 return; 1877 1878 case TCPS_SYN_SENT: 1879 db_printf("TCPS_SYN_SENT"); 1880 return; 1881 1882 case TCPS_SYN_RECEIVED: 1883 db_printf("TCPS_SYN_RECEIVED"); 1884 return; 1885 1886 case TCPS_ESTABLISHED: 1887 db_printf("TCPS_ESTABLISHED"); 1888 return; 1889 1890 case TCPS_CLOSE_WAIT: 1891 db_printf("TCPS_CLOSE_WAIT"); 1892 return; 1893 1894 case TCPS_FIN_WAIT_1: 1895 db_printf("TCPS_FIN_WAIT_1"); 1896 return; 1897 1898 case TCPS_CLOSING: 1899 db_printf("TCPS_CLOSING"); 1900 return; 1901 1902 case TCPS_LAST_ACK: 1903 db_printf("TCPS_LAST_ACK"); 1904 return; 1905 1906 case TCPS_FIN_WAIT_2: 1907 db_printf("TCPS_FIN_WAIT_2"); 1908 return; 1909 1910 case TCPS_TIME_WAIT: 1911 db_printf("TCPS_TIME_WAIT"); 1912 return; 1913 1914 default: 1915 db_printf("unknown"); 1916 return; 1917 } 1918} 1919 1920static void 1921db_print_tflags(u_int t_flags) 1922{ 1923 int comma; 1924 1925 comma = 0; 1926 if (t_flags & TF_ACKNOW) { 1927 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 1928 comma = 1; 1929 } 1930 if (t_flags & TF_DELACK) { 1931 db_printf("%sTF_DELACK", comma ? ", " : ""); 1932 comma = 1; 1933 } 1934 if (t_flags & TF_NODELAY) { 1935 db_printf("%sTF_NODELAY", comma ? ", " : ""); 1936 comma = 1; 1937 } 1938 if (t_flags & TF_NOOPT) { 1939 db_printf("%sTF_NOOPT", comma ? ", " : ""); 1940 comma = 1; 1941 } 1942 if (t_flags & TF_SENTFIN) { 1943 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 1944 comma = 1; 1945 } 1946 if (t_flags & TF_REQ_SCALE) { 1947 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 1948 comma = 1; 1949 } 1950 if (t_flags & TF_RCVD_SCALE) { 1951 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 1952 comma = 1; 1953 } 1954 if (t_flags & TF_REQ_TSTMP) { 1955 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 1956 comma = 1; 1957 } 1958 if (t_flags & TF_RCVD_TSTMP) { 1959 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 1960 comma = 1; 1961 } 1962 if (t_flags & TF_SACK_PERMIT) { 1963 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 1964 comma = 1; 1965 } 1966 if (t_flags & TF_NEEDSYN) { 1967 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 1968 comma = 1; 1969 } 1970 if (t_flags & TF_NEEDFIN) { 1971 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 1972 comma = 1; 1973 } 1974 if (t_flags & TF_NOPUSH) { 1975 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1976 comma = 1; 1977 } 1978 if (t_flags & TF_MORETOCOME) { 1979 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 1980 comma = 1; 1981 } 1982 if (t_flags & TF_LQ_OVERFLOW) { 1983 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 1984 comma = 1; 1985 } 1986 if (t_flags & TF_LASTIDLE) { 1987 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 1988 comma = 1; 1989 } 1990 if (t_flags & TF_RXWIN0SENT) { 1991 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 1992 comma = 1; 1993 } 1994 if (t_flags & TF_FASTRECOVERY) { 1995 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 1996 comma = 1; 1997 } 1998 if (t_flags & TF_CONGRECOVERY) { 1999 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2000 comma = 1; 2001 } 2002 if (t_flags & TF_WASFRECOVERY) { 2003 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2004 comma = 1; 2005 } 2006 if (t_flags & TF_SIGNATURE) { 2007 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2008 comma = 1; 2009 } 2010 if (t_flags & TF_FORCEDATA) { 2011 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2012 comma = 1; 2013 } 2014 if (t_flags & TF_TSO) { 2015 db_printf("%sTF_TSO", comma ? ", " : ""); 2016 comma = 1; 2017 } 2018 if (t_flags & TF_ECN_PERMIT) { 2019 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2020 comma = 1; 2021 } 2022 if (t_flags & TF_FASTOPEN) { 2023 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2024 comma = 1; 2025 } 2026} 2027 2028static void 2029db_print_toobflags(char t_oobflags) 2030{ 2031 int comma; 2032 2033 comma = 0; 2034 if (t_oobflags & TCPOOB_HAVEDATA) { 2035 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2036 comma = 1; 2037 } 2038 if (t_oobflags & TCPOOB_HADDATA) { 2039 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2040 comma = 1; 2041 } 2042} 2043 2044static void 2045db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2046{ 2047 2048 db_print_indent(indent); 2049 db_printf("%s at %p\n", name, tp); 2050 2051 indent += 2; 2052 2053 db_print_indent(indent); 2054 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2055 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2056 2057 db_print_indent(indent); 2058 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2059 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2060 2061 db_print_indent(indent); 2062 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2063 &tp->t_timers->tt_delack, tp->t_inpcb); 2064 2065 db_print_indent(indent); 2066 db_printf("t_state: %d (", tp->t_state); 2067 db_print_tstate(tp->t_state); 2068 db_printf(")\n"); 2069 2070 db_print_indent(indent); 2071 db_printf("t_flags: 0x%x (", tp->t_flags); 2072 db_print_tflags(tp->t_flags); 2073 db_printf(")\n"); 2074 2075 db_print_indent(indent); 2076 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2077 tp->snd_una, tp->snd_max, tp->snd_nxt); 2078 2079 db_print_indent(indent); 2080 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2081 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2082 2083 db_print_indent(indent); 2084 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2085 tp->iss, tp->irs, tp->rcv_nxt); 2086 2087 db_print_indent(indent); 2088 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2089 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2090 2091 db_print_indent(indent); 2092 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2093 tp->snd_wnd, tp->snd_cwnd); 2094 2095 db_print_indent(indent); 2096 db_printf("snd_ssthresh: %lu snd_recover: " 2097 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2098 2099 db_print_indent(indent); 2100 db_printf("t_maxopd: %u t_rcvtime: %u t_startime: %u\n", 2101 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime); 2102 2103 db_print_indent(indent); 2104 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2105 tp->t_rtttime, tp->t_rtseq); 2106 2107 db_print_indent(indent); 2108 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2109 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2110 2111 db_print_indent(indent); 2112 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2113 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2114 tp->t_rttbest); 2115 2116 db_print_indent(indent); 2117 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2118 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2119 2120 db_print_indent(indent); 2121 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2122 db_print_toobflags(tp->t_oobflags); 2123 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2124 2125 db_print_indent(indent); 2126 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2127 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2128 2129 db_print_indent(indent); 2130 db_printf("ts_recent: %u ts_recent_age: %u\n", 2131 tp->ts_recent, tp->ts_recent_age); 2132 2133 db_print_indent(indent); 2134 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2135 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2136 2137 db_print_indent(indent); 2138 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2139 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2140 tp->snd_recover_prev, tp->t_badrxtwin); 2141 2142 db_print_indent(indent); 2143 db_printf("snd_numholes: %d snd_holes first: %p\n", 2144 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2145 2146 db_print_indent(indent); 2147 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2148 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2149 2150 /* Skip sackblks, sackhint. */ 2151 2152 db_print_indent(indent); 2153 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2154 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2155} 2156 2157DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2158{ 2159 struct tcpcb *tp; 2160 2161 if (!have_addr) { 2162 db_printf("usage: show tcpcb <addr>\n"); 2163 return; 2164 } 2165 tp = (struct tcpcb *)addr; 2166 2167 db_print_tcpcb(tp, "tcpcb", 0); 2168} 2169#endif 2170