tcp_usrreq.c revision 338985
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 338985 2018-09-27 18:48:50Z gordon $"); 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 u_char vflagsav; 332 333 sin6p = (struct sockaddr_in6 *)nam; 334 if (nam->sa_len != sizeof (*sin6p)) 335 return (EINVAL); 336 /* 337 * Must check for multicast addresses and disallow binding 338 * to them. 339 */ 340 if (sin6p->sin6_family == AF_INET6 && 341 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 342 return (EAFNOSUPPORT); 343 344 TCPDEBUG0; 345 inp = sotoinpcb(so); 346 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 347 INP_WLOCK(inp); 348 vflagsav = inp->inp_vflag; 349 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 350 error = EINVAL; 351 goto out; 352 } 353 tp = intotcpcb(inp); 354 TCPDEBUG1(); 355 INP_HASH_WLOCK(&V_tcbinfo); 356 inp->inp_vflag &= ~INP_IPV4; 357 inp->inp_vflag |= INP_IPV6; 358#ifdef INET 359 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 360 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 361 inp->inp_vflag |= INP_IPV4; 362 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 363 struct sockaddr_in sin; 364 365 in6_sin6_2_sin(&sin, sin6p); 366 inp->inp_vflag |= INP_IPV4; 367 inp->inp_vflag &= ~INP_IPV6; 368 error = in_pcbbind(inp, (struct sockaddr *)&sin, 369 td->td_ucred); 370 INP_HASH_WUNLOCK(&V_tcbinfo); 371 goto out; 372 } 373 } 374#endif 375 error = in6_pcbbind(inp, nam, td->td_ucred); 376 INP_HASH_WUNLOCK(&V_tcbinfo); 377out: 378 if (error != 0) 379 inp->inp_vflag = vflagsav; 380 TCPDEBUG2(PRU_BIND); 381 INP_WUNLOCK(inp); 382 return (error); 383} 384#endif /* INET6 */ 385 386#ifdef INET 387/* 388 * Prepare to accept connections. 389 */ 390static int 391tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 392{ 393 int error = 0; 394 struct inpcb *inp; 395 struct tcpcb *tp = NULL; 396 397 TCPDEBUG0; 398 inp = sotoinpcb(so); 399 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 400 INP_WLOCK(inp); 401 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 402 error = EINVAL; 403 goto out; 404 } 405 tp = intotcpcb(inp); 406 TCPDEBUG1(); 407 SOCK_LOCK(so); 408 error = solisten_proto_check(so); 409 INP_HASH_WLOCK(&V_tcbinfo); 410 if (error == 0 && inp->inp_lport == 0) 411 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 412 INP_HASH_WUNLOCK(&V_tcbinfo); 413 if (error == 0) { 414 tcp_state_change(tp, TCPS_LISTEN); 415 solisten_proto(so, backlog); 416#ifdef TCP_OFFLOAD 417 if ((so->so_options & SO_NO_OFFLOAD) == 0) 418 tcp_offload_listen_start(tp); 419#endif 420 } 421 SOCK_UNLOCK(so); 422 423#ifdef TCP_RFC7413 424 if (tp->t_flags & TF_FASTOPEN) 425 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 426#endif 427out: 428 TCPDEBUG2(PRU_LISTEN); 429 INP_WUNLOCK(inp); 430 return (error); 431} 432#endif /* INET */ 433 434#ifdef INET6 435static int 436tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 437{ 438 int error = 0; 439 struct inpcb *inp; 440 struct tcpcb *tp = NULL; 441 u_char vflagsav; 442 443 TCPDEBUG0; 444 inp = sotoinpcb(so); 445 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 446 INP_WLOCK(inp); 447 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 448 error = EINVAL; 449 goto out; 450 } 451 vflagsav = inp->inp_vflag; 452 tp = intotcpcb(inp); 453 TCPDEBUG1(); 454 SOCK_LOCK(so); 455 error = solisten_proto_check(so); 456 INP_HASH_WLOCK(&V_tcbinfo); 457 if (error == 0 && inp->inp_lport == 0) { 458 inp->inp_vflag &= ~INP_IPV4; 459 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 460 inp->inp_vflag |= INP_IPV4; 461 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 462 } 463 INP_HASH_WUNLOCK(&V_tcbinfo); 464 if (error == 0) { 465 tcp_state_change(tp, TCPS_LISTEN); 466 solisten_proto(so, backlog); 467#ifdef TCP_OFFLOAD 468 if ((so->so_options & SO_NO_OFFLOAD) == 0) 469 tcp_offload_listen_start(tp); 470#endif 471 } 472 SOCK_UNLOCK(so); 473 474#ifdef TCP_RFC7413 475 if (tp->t_flags & TF_FASTOPEN) 476 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 477#endif 478 if (error != 0) 479 inp->inp_vflag = vflagsav; 480 481out: 482 TCPDEBUG2(PRU_LISTEN); 483 INP_WUNLOCK(inp); 484 return (error); 485} 486#endif /* INET6 */ 487 488#ifdef INET 489/* 490 * Initiate connection to peer. 491 * Create a template for use in transmissions on this connection. 492 * Enter SYN_SENT state, and mark socket as connecting. 493 * Start keep-alive timer, and seed output sequence space. 494 * Send initial segment on connection. 495 */ 496static int 497tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 498{ 499 int error = 0; 500 struct inpcb *inp; 501 struct tcpcb *tp = NULL; 502 struct sockaddr_in *sinp; 503 504 sinp = (struct sockaddr_in *)nam; 505 if (nam->sa_len != sizeof (*sinp)) 506 return (EINVAL); 507 /* 508 * Must disallow TCP ``connections'' to multicast addresses. 509 */ 510 if (sinp->sin_family == AF_INET 511 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 512 return (EAFNOSUPPORT); 513 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 514 return (error); 515 516 TCPDEBUG0; 517 inp = sotoinpcb(so); 518 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 519 INP_WLOCK(inp); 520 if (inp->inp_flags & INP_TIMEWAIT) { 521 error = EADDRINUSE; 522 goto out; 523 } 524 if (inp->inp_flags & INP_DROPPED) { 525 error = ECONNREFUSED; 526 goto out; 527 } 528 tp = intotcpcb(inp); 529 TCPDEBUG1(); 530 if ((error = tcp_connect(tp, nam, td)) != 0) 531 goto out; 532#ifdef TCP_OFFLOAD 533 if (registered_toedevs > 0 && 534 (so->so_options & SO_NO_OFFLOAD) == 0 && 535 (error = tcp_offload_connect(so, nam)) == 0) 536 goto out; 537#endif 538 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 539 error = tcp_output(tp); 540out: 541 TCPDEBUG2(PRU_CONNECT); 542 INP_WUNLOCK(inp); 543 return (error); 544} 545#endif /* INET */ 546 547#ifdef INET6 548static int 549tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 550{ 551 int error = 0; 552 struct inpcb *inp; 553 struct tcpcb *tp = NULL; 554 struct sockaddr_in6 *sin6p; 555 u_int8_t incflagsav; 556 u_char vflagsav; 557 558 TCPDEBUG0; 559 560 sin6p = (struct sockaddr_in6 *)nam; 561 if (nam->sa_len != sizeof (*sin6p)) 562 return (EINVAL); 563 /* 564 * Must disallow TCP ``connections'' to multicast addresses. 565 */ 566 if (sin6p->sin6_family == AF_INET6 567 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 568 return (EAFNOSUPPORT); 569 570 inp = sotoinpcb(so); 571 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 572 INP_WLOCK(inp); 573 vflagsav = inp->inp_vflag; 574 incflagsav = inp->inp_inc.inc_flags; 575 if (inp->inp_flags & INP_TIMEWAIT) { 576 error = EADDRINUSE; 577 goto out; 578 } 579 if (inp->inp_flags & INP_DROPPED) { 580 error = ECONNREFUSED; 581 goto out; 582 } 583 tp = intotcpcb(inp); 584 TCPDEBUG1(); 585#ifdef INET 586 /* 587 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 588 * therefore probably require the hash lock, which isn't held here. 589 * Is this a significant problem? 590 */ 591 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 592 struct sockaddr_in sin; 593 594 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 595 error = EINVAL; 596 goto out; 597 } 598 599 in6_sin6_2_sin(&sin, sin6p); 600 if ((error = prison_remote_ip4(td->td_ucred, 601 &sin.sin_addr)) != 0) 602 goto out; 603 inp->inp_vflag |= INP_IPV4; 604 inp->inp_vflag &= ~INP_IPV6; 605 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 606 goto out; 607#ifdef TCP_OFFLOAD 608 if (registered_toedevs > 0 && 609 (so->so_options & SO_NO_OFFLOAD) == 0 && 610 (error = tcp_offload_connect(so, nam)) == 0) 611 goto out; 612#endif 613 error = tcp_output(tp); 614 goto out; 615 } 616#endif 617 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 618 goto out; 619 inp->inp_vflag &= ~INP_IPV4; 620 inp->inp_vflag |= INP_IPV6; 621 inp->inp_inc.inc_flags |= INC_ISIPV6; 622 if ((error = tcp6_connect(tp, nam, td)) != 0) 623 goto out; 624#ifdef TCP_OFFLOAD 625 if (registered_toedevs > 0 && 626 (so->so_options & SO_NO_OFFLOAD) == 0 && 627 (error = tcp_offload_connect(so, nam)) == 0) 628 goto out; 629#endif 630 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 631 error = tcp_output(tp); 632 633out: 634 /* 635 * If the implicit bind in the connect call fails, restore 636 * the flags we modified. 637 */ 638 if (error != 0 && inp->inp_lport == 0) { 639 inp->inp_vflag = vflagsav; 640 inp->inp_inc.inc_flags = incflagsav; 641 } 642 643 TCPDEBUG2(PRU_CONNECT); 644 INP_WUNLOCK(inp); 645 return (error); 646} 647#endif /* INET6 */ 648 649/* 650 * Initiate disconnect from peer. 651 * If connection never passed embryonic stage, just drop; 652 * else if don't need to let data drain, then can just drop anyways, 653 * else have to begin TCP shutdown process: mark socket disconnecting, 654 * drain unread data, state switch to reflect user close, and 655 * send segment (e.g. FIN) to peer. Socket will be really disconnected 656 * when peer sends FIN and acks ours. 657 * 658 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 659 */ 660static int 661tcp_usr_disconnect(struct socket *so) 662{ 663 struct inpcb *inp; 664 struct tcpcb *tp = NULL; 665 int error = 0; 666 667 TCPDEBUG0; 668 INP_INFO_RLOCK(&V_tcbinfo); 669 inp = sotoinpcb(so); 670 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 671 INP_WLOCK(inp); 672 if (inp->inp_flags & INP_TIMEWAIT) 673 goto out; 674 if (inp->inp_flags & INP_DROPPED) { 675 error = ECONNRESET; 676 goto out; 677 } 678 tp = intotcpcb(inp); 679 TCPDEBUG1(); 680 tcp_disconnect(tp); 681out: 682 TCPDEBUG2(PRU_DISCONNECT); 683 INP_WUNLOCK(inp); 684 INP_INFO_RUNLOCK(&V_tcbinfo); 685 return (error); 686} 687 688#ifdef INET 689/* 690 * Accept a connection. Essentially all the work is done at higher levels; 691 * just return the address of the peer, storing through addr. 692 */ 693static int 694tcp_usr_accept(struct socket *so, struct sockaddr **nam) 695{ 696 int error = 0; 697 struct inpcb *inp = NULL; 698 struct tcpcb *tp = NULL; 699 struct in_addr addr; 700 in_port_t port = 0; 701 TCPDEBUG0; 702 703 if (so->so_state & SS_ISDISCONNECTED) 704 return (ECONNABORTED); 705 706 inp = sotoinpcb(so); 707 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 708 INP_WLOCK(inp); 709 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 710 error = ECONNABORTED; 711 goto out; 712 } 713 tp = intotcpcb(inp); 714 TCPDEBUG1(); 715 716 /* 717 * We inline in_getpeeraddr and COMMON_END here, so that we can 718 * copy the data of interest and defer the malloc until after we 719 * release the lock. 720 */ 721 port = inp->inp_fport; 722 addr = inp->inp_faddr; 723 724out: 725 TCPDEBUG2(PRU_ACCEPT); 726 INP_WUNLOCK(inp); 727 if (error == 0) 728 *nam = in_sockaddr(port, &addr); 729 return error; 730} 731#endif /* INET */ 732 733#ifdef INET6 734static int 735tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 736{ 737 struct inpcb *inp = NULL; 738 int error = 0; 739 struct tcpcb *tp = NULL; 740 struct in_addr addr; 741 struct in6_addr addr6; 742 in_port_t port = 0; 743 int v4 = 0; 744 TCPDEBUG0; 745 746 if (so->so_state & SS_ISDISCONNECTED) 747 return (ECONNABORTED); 748 749 inp = sotoinpcb(so); 750 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 751 INP_INFO_RLOCK(&V_tcbinfo); 752 INP_WLOCK(inp); 753 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 754 error = ECONNABORTED; 755 goto out; 756 } 757 tp = intotcpcb(inp); 758 TCPDEBUG1(); 759 760 /* 761 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 762 * copy the data of interest and defer the malloc until after we 763 * release the lock. 764 */ 765 if (inp->inp_vflag & INP_IPV4) { 766 v4 = 1; 767 port = inp->inp_fport; 768 addr = inp->inp_faddr; 769 } else { 770 port = inp->inp_fport; 771 addr6 = inp->in6p_faddr; 772 } 773 774out: 775 TCPDEBUG2(PRU_ACCEPT); 776 INP_WUNLOCK(inp); 777 INP_INFO_RUNLOCK(&V_tcbinfo); 778 if (error == 0) { 779 if (v4) 780 *nam = in6_v4mapsin6_sockaddr(port, &addr); 781 else 782 *nam = in6_sockaddr(port, &addr6); 783 } 784 return error; 785} 786#endif /* INET6 */ 787 788/* 789 * Mark the connection as being incapable of further output. 790 */ 791static int 792tcp_usr_shutdown(struct socket *so) 793{ 794 int error = 0; 795 struct inpcb *inp; 796 struct tcpcb *tp = NULL; 797 798 TCPDEBUG0; 799 INP_INFO_RLOCK(&V_tcbinfo); 800 inp = sotoinpcb(so); 801 KASSERT(inp != NULL, ("inp == NULL")); 802 INP_WLOCK(inp); 803 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 804 error = ECONNRESET; 805 goto out; 806 } 807 tp = intotcpcb(inp); 808 TCPDEBUG1(); 809 socantsendmore(so); 810 tcp_usrclosed(tp); 811 if (!(inp->inp_flags & INP_DROPPED)) 812 error = tcp_output(tp); 813 814out: 815 TCPDEBUG2(PRU_SHUTDOWN); 816 INP_WUNLOCK(inp); 817 INP_INFO_RUNLOCK(&V_tcbinfo); 818 819 return (error); 820} 821 822/* 823 * After a receive, possibly send window update to peer. 824 */ 825static int 826tcp_usr_rcvd(struct socket *so, int flags) 827{ 828 struct inpcb *inp; 829 struct tcpcb *tp = NULL; 830 int error = 0; 831 832 TCPDEBUG0; 833 inp = sotoinpcb(so); 834 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 835 INP_WLOCK(inp); 836 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 837 error = ECONNRESET; 838 goto out; 839 } 840 tp = intotcpcb(inp); 841 TCPDEBUG1(); 842#ifdef TCP_RFC7413 843 /* 844 * For passively-created TFO connections, don't attempt a window 845 * update while still in SYN_RECEIVED as this may trigger an early 846 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 847 * application response data, or failing that, when the DELACK timer 848 * expires. 849 */ 850 if ((tp->t_flags & TF_FASTOPEN) && 851 (tp->t_state == TCPS_SYN_RECEIVED)) 852 goto out; 853#endif 854#ifdef TCP_OFFLOAD 855 if (tp->t_flags & TF_TOE) 856 tcp_offload_rcvd(tp); 857 else 858#endif 859 tcp_output(tp); 860 861out: 862 TCPDEBUG2(PRU_RCVD); 863 INP_WUNLOCK(inp); 864 return (error); 865} 866 867/* 868 * Do a send by putting data in output queue and updating urgent 869 * marker if URG set. Possibly send more data. Unlike the other 870 * pru_*() routines, the mbuf chains are our responsibility. We 871 * must either enqueue them or free them. The other pru_* routines 872 * generally are caller-frees. 873 */ 874static int 875tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 876 struct sockaddr *nam, struct mbuf *control, struct thread *td) 877{ 878 int error = 0; 879 struct inpcb *inp; 880 struct tcpcb *tp = NULL; 881#ifdef INET6 882 int isipv6; 883#endif 884 TCPDEBUG0; 885 886 /* 887 * We require the pcbinfo lock if we will close the socket as part of 888 * this call. 889 */ 890 if (flags & PRUS_EOF) 891 INP_INFO_RLOCK(&V_tcbinfo); 892 inp = sotoinpcb(so); 893 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 894 INP_WLOCK(inp); 895 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 896 if (control) 897 m_freem(control); 898 if (m) 899 m_freem(m); 900 error = ECONNRESET; 901 goto out; 902 } 903#ifdef INET6 904 isipv6 = nam && nam->sa_family == AF_INET6; 905#endif /* INET6 */ 906 tp = intotcpcb(inp); 907 TCPDEBUG1(); 908 if (control) { 909 /* TCP doesn't do control messages (rights, creds, etc) */ 910 if (control->m_len) { 911 m_freem(control); 912 if (m) 913 m_freem(m); 914 error = EINVAL; 915 goto out; 916 } 917 m_freem(control); /* empty control, just free it */ 918 } 919 if (!(flags & PRUS_OOB)) { 920 sbappendstream(&so->so_snd, m); 921 if (nam && tp->t_state < TCPS_SYN_SENT) { 922 /* 923 * Do implied connect if not yet connected, 924 * initialize window to default value, and 925 * initialize maxseg/maxopd using peer's cached 926 * MSS. 927 */ 928#ifdef INET6 929 if (isipv6) 930 error = tcp6_connect(tp, nam, td); 931#endif /* INET6 */ 932#if defined(INET6) && defined(INET) 933 else 934#endif 935#ifdef INET 936 error = tcp_connect(tp, nam, td); 937#endif 938 if (error) 939 goto out; 940 tp->snd_wnd = TTCP_CLIENT_SND_WND; 941 tcp_mss(tp, -1); 942 } 943 if (flags & PRUS_EOF) { 944 /* 945 * Close the send side of the connection after 946 * the data is sent. 947 */ 948 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 949 socantsendmore(so); 950 tcp_usrclosed(tp); 951 } 952 if (!(inp->inp_flags & INP_DROPPED)) { 953 if (flags & PRUS_MORETOCOME) 954 tp->t_flags |= TF_MORETOCOME; 955 error = tcp_output(tp); 956 if (flags & PRUS_MORETOCOME) 957 tp->t_flags &= ~TF_MORETOCOME; 958 } 959 } else { 960 /* 961 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 962 */ 963 SOCKBUF_LOCK(&so->so_snd); 964 if (sbspace(&so->so_snd) < -512) { 965 SOCKBUF_UNLOCK(&so->so_snd); 966 m_freem(m); 967 error = ENOBUFS; 968 goto out; 969 } 970 /* 971 * According to RFC961 (Assigned Protocols), 972 * the urgent pointer points to the last octet 973 * of urgent data. We continue, however, 974 * to consider it to indicate the first octet 975 * of data past the urgent section. 976 * Otherwise, snd_up should be one lower. 977 */ 978 sbappendstream_locked(&so->so_snd, m); 979 SOCKBUF_UNLOCK(&so->so_snd); 980 if (nam && tp->t_state < TCPS_SYN_SENT) { 981 /* 982 * Do implied connect if not yet connected, 983 * initialize window to default value, and 984 * initialize maxseg/maxopd using peer's cached 985 * MSS. 986 */ 987#ifdef INET6 988 if (isipv6) 989 error = tcp6_connect(tp, nam, td); 990#endif /* INET6 */ 991#if defined(INET6) && defined(INET) 992 else 993#endif 994#ifdef INET 995 error = tcp_connect(tp, nam, td); 996#endif 997 if (error) 998 goto out; 999 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1000 tcp_mss(tp, -1); 1001 } 1002 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 1003 tp->t_flags |= TF_FORCEDATA; 1004 error = tcp_output(tp); 1005 tp->t_flags &= ~TF_FORCEDATA; 1006 } 1007out: 1008 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1009 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1010 INP_WUNLOCK(inp); 1011 if (flags & PRUS_EOF) 1012 INP_INFO_RUNLOCK(&V_tcbinfo); 1013 return (error); 1014} 1015 1016/* 1017 * Abort the TCP. Drop the connection abruptly. 1018 */ 1019static void 1020tcp_usr_abort(struct socket *so) 1021{ 1022 struct inpcb *inp; 1023 struct tcpcb *tp = NULL; 1024 TCPDEBUG0; 1025 1026 inp = sotoinpcb(so); 1027 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1028 1029 INP_INFO_RLOCK(&V_tcbinfo); 1030 INP_WLOCK(inp); 1031 KASSERT(inp->inp_socket != NULL, 1032 ("tcp_usr_abort: inp_socket == NULL")); 1033 1034 /* 1035 * If we still have full TCP state, and we're not dropped, drop. 1036 */ 1037 if (!(inp->inp_flags & INP_TIMEWAIT) && 1038 !(inp->inp_flags & INP_DROPPED)) { 1039 tp = intotcpcb(inp); 1040 TCPDEBUG1(); 1041 tcp_drop(tp, ECONNABORTED); 1042 TCPDEBUG2(PRU_ABORT); 1043 } 1044 if (!(inp->inp_flags & INP_DROPPED)) { 1045 SOCK_LOCK(so); 1046 so->so_state |= SS_PROTOREF; 1047 SOCK_UNLOCK(so); 1048 inp->inp_flags |= INP_SOCKREF; 1049 } 1050 INP_WUNLOCK(inp); 1051 INP_INFO_RUNLOCK(&V_tcbinfo); 1052} 1053 1054/* 1055 * TCP socket is closed. Start friendly disconnect. 1056 */ 1057static void 1058tcp_usr_close(struct socket *so) 1059{ 1060 struct inpcb *inp; 1061 struct tcpcb *tp = NULL; 1062 TCPDEBUG0; 1063 1064 inp = sotoinpcb(so); 1065 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1066 1067 INP_INFO_RLOCK(&V_tcbinfo); 1068 INP_WLOCK(inp); 1069 KASSERT(inp->inp_socket != NULL, 1070 ("tcp_usr_close: inp_socket == NULL")); 1071 1072 /* 1073 * If we still have full TCP state, and we're not dropped, initiate 1074 * a disconnect. 1075 */ 1076 if (!(inp->inp_flags & INP_TIMEWAIT) && 1077 !(inp->inp_flags & INP_DROPPED)) { 1078 tp = intotcpcb(inp); 1079 TCPDEBUG1(); 1080 tcp_disconnect(tp); 1081 TCPDEBUG2(PRU_CLOSE); 1082 } 1083 if (!(inp->inp_flags & INP_DROPPED)) { 1084 SOCK_LOCK(so); 1085 so->so_state |= SS_PROTOREF; 1086 SOCK_UNLOCK(so); 1087 inp->inp_flags |= INP_SOCKREF; 1088 } 1089 INP_WUNLOCK(inp); 1090 INP_INFO_RUNLOCK(&V_tcbinfo); 1091} 1092 1093/* 1094 * Receive out-of-band data. 1095 */ 1096static int 1097tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1098{ 1099 int error = 0; 1100 struct inpcb *inp; 1101 struct tcpcb *tp = NULL; 1102 1103 TCPDEBUG0; 1104 inp = sotoinpcb(so); 1105 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1106 INP_WLOCK(inp); 1107 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1108 error = ECONNRESET; 1109 goto out; 1110 } 1111 tp = intotcpcb(inp); 1112 TCPDEBUG1(); 1113 if ((so->so_oobmark == 0 && 1114 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1115 so->so_options & SO_OOBINLINE || 1116 tp->t_oobflags & TCPOOB_HADDATA) { 1117 error = EINVAL; 1118 goto out; 1119 } 1120 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1121 error = EWOULDBLOCK; 1122 goto out; 1123 } 1124 m->m_len = 1; 1125 *mtod(m, caddr_t) = tp->t_iobc; 1126 if ((flags & MSG_PEEK) == 0) 1127 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1128 1129out: 1130 TCPDEBUG2(PRU_RCVOOB); 1131 INP_WUNLOCK(inp); 1132 return (error); 1133} 1134 1135#ifdef INET 1136struct pr_usrreqs tcp_usrreqs = { 1137 .pru_abort = tcp_usr_abort, 1138 .pru_accept = tcp_usr_accept, 1139 .pru_attach = tcp_usr_attach, 1140 .pru_bind = tcp_usr_bind, 1141 .pru_connect = tcp_usr_connect, 1142 .pru_control = in_control, 1143 .pru_detach = tcp_usr_detach, 1144 .pru_disconnect = tcp_usr_disconnect, 1145 .pru_listen = tcp_usr_listen, 1146 .pru_peeraddr = in_getpeeraddr, 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 = in_getsockaddr, 1152 .pru_sosetlabel = in_pcbsosetlabel, 1153 .pru_close = tcp_usr_close, 1154}; 1155#endif /* INET */ 1156 1157#ifdef INET6 1158struct pr_usrreqs tcp6_usrreqs = { 1159 .pru_abort = tcp_usr_abort, 1160 .pru_accept = tcp6_usr_accept, 1161 .pru_attach = tcp_usr_attach, 1162 .pru_bind = tcp6_usr_bind, 1163 .pru_connect = tcp6_usr_connect, 1164 .pru_control = in6_control, 1165 .pru_detach = tcp_usr_detach, 1166 .pru_disconnect = tcp_usr_disconnect, 1167 .pru_listen = tcp6_usr_listen, 1168 .pru_peeraddr = in6_mapped_peeraddr, 1169 .pru_rcvd = tcp_usr_rcvd, 1170 .pru_rcvoob = tcp_usr_rcvoob, 1171 .pru_send = tcp_usr_send, 1172 .pru_shutdown = tcp_usr_shutdown, 1173 .pru_sockaddr = in6_mapped_sockaddr, 1174 .pru_sosetlabel = in_pcbsosetlabel, 1175 .pru_close = tcp_usr_close, 1176}; 1177#endif /* INET6 */ 1178 1179#ifdef INET 1180/* 1181 * Common subroutine to open a TCP connection to remote host specified 1182 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1183 * port number if needed. Call in_pcbconnect_setup to do the routing and 1184 * to choose a local host address (interface). If there is an existing 1185 * incarnation of the same connection in TIME-WAIT state and if the remote 1186 * host was sending CC options and if the connection duration was < MSL, then 1187 * truncate the previous TIME-WAIT state and proceed. 1188 * Initialize connection parameters and enter SYN-SENT state. 1189 */ 1190static int 1191tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1192{ 1193 struct inpcb *inp = tp->t_inpcb, *oinp; 1194 struct socket *so = inp->inp_socket; 1195 struct in_addr laddr; 1196 u_short lport; 1197 int error; 1198 1199 INP_WLOCK_ASSERT(inp); 1200 INP_HASH_WLOCK(&V_tcbinfo); 1201 1202 if (inp->inp_lport == 0) { 1203 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1204 if (error) 1205 goto out; 1206 } 1207 1208 /* 1209 * Cannot simply call in_pcbconnect, because there might be an 1210 * earlier incarnation of this same connection still in 1211 * TIME_WAIT state, creating an ADDRINUSE error. 1212 */ 1213 laddr = inp->inp_laddr; 1214 lport = inp->inp_lport; 1215 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1216 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1217 if (error && oinp == NULL) 1218 goto out; 1219 if (oinp) { 1220 error = EADDRINUSE; 1221 goto out; 1222 } 1223 inp->inp_laddr = laddr; 1224 in_pcbrehash(inp); 1225 INP_HASH_WUNLOCK(&V_tcbinfo); 1226 1227 /* 1228 * Compute window scaling to request: 1229 * Scale to fit into sweet spot. See tcp_syncache.c. 1230 * XXX: This should move to tcp_output(). 1231 */ 1232 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1233 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1234 tp->request_r_scale++; 1235 1236 soisconnecting(so); 1237 TCPSTAT_INC(tcps_connattempt); 1238 tcp_state_change(tp, TCPS_SYN_SENT); 1239 tp->iss = tcp_new_isn(tp); 1240 tcp_sendseqinit(tp); 1241 1242 return 0; 1243 1244out: 1245 INP_HASH_WUNLOCK(&V_tcbinfo); 1246 return (error); 1247} 1248#endif /* INET */ 1249 1250#ifdef INET6 1251static int 1252tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1253{ 1254 struct inpcb *inp = tp->t_inpcb, *oinp; 1255 struct socket *so = inp->inp_socket; 1256 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1257 struct in6_addr addr6; 1258 int error; 1259 1260 INP_WLOCK_ASSERT(inp); 1261 INP_HASH_WLOCK(&V_tcbinfo); 1262 1263 if (inp->inp_lport == 0) { 1264 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1265 if (error) 1266 goto out; 1267 } 1268 1269 /* 1270 * Cannot simply call in_pcbconnect, because there might be an 1271 * earlier incarnation of this same connection still in 1272 * TIME_WAIT state, creating an ADDRINUSE error. 1273 * in6_pcbladdr() also handles scope zone IDs. 1274 * 1275 * XXXRW: We wouldn't need to expose in6_pcblookup_hash_locked() 1276 * outside of in6_pcb.c if there were an in6_pcbconnect_setup(). 1277 */ 1278 error = in6_pcbladdr(inp, nam, &addr6); 1279 if (error) 1280 goto out; 1281 oinp = in6_pcblookup_hash_locked(inp->inp_pcbinfo, 1282 &sin6->sin6_addr, sin6->sin6_port, 1283 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 1284 ? &addr6 1285 : &inp->in6p_laddr, 1286 inp->inp_lport, 0, NULL); 1287 if (oinp) { 1288 error = EADDRINUSE; 1289 goto out; 1290 } 1291 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1292 inp->in6p_laddr = addr6; 1293 inp->in6p_faddr = sin6->sin6_addr; 1294 inp->inp_fport = sin6->sin6_port; 1295 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 1296 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 1297 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 1298 inp->inp_flow |= 1299 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 1300 in_pcbrehash(inp); 1301 INP_HASH_WUNLOCK(&V_tcbinfo); 1302 1303 /* Compute window scaling to request. */ 1304 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1305 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1306 tp->request_r_scale++; 1307 1308 soisconnecting(so); 1309 TCPSTAT_INC(tcps_connattempt); 1310 tcp_state_change(tp, TCPS_SYN_SENT); 1311 tp->iss = tcp_new_isn(tp); 1312 tcp_sendseqinit(tp); 1313 1314 return 0; 1315 1316out: 1317 INP_HASH_WUNLOCK(&V_tcbinfo); 1318 return error; 1319} 1320#endif /* INET6 */ 1321 1322/* 1323 * Export TCP internal state information via a struct tcp_info, based on the 1324 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1325 * (TCP state machine, etc). We export all information using FreeBSD-native 1326 * constants -- for example, the numeric values for tcpi_state will differ 1327 * from Linux. 1328 */ 1329static void 1330tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1331{ 1332 1333 INP_WLOCK_ASSERT(tp->t_inpcb); 1334 bzero(ti, sizeof(*ti)); 1335 1336 ti->tcpi_state = tp->t_state; 1337 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1338 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1339 if (tp->t_flags & TF_SACK_PERMIT) 1340 ti->tcpi_options |= TCPI_OPT_SACK; 1341 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1342 ti->tcpi_options |= TCPI_OPT_WSCALE; 1343 ti->tcpi_snd_wscale = tp->snd_scale; 1344 ti->tcpi_rcv_wscale = tp->rcv_scale; 1345 } 1346 1347 ti->tcpi_rto = tp->t_rxtcur * tick; 1348 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1349 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1350 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1351 1352 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1353 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1354 1355 /* 1356 * FreeBSD-specific extension fields for tcp_info. 1357 */ 1358 ti->tcpi_rcv_space = tp->rcv_wnd; 1359 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1360 ti->tcpi_snd_wnd = tp->snd_wnd; 1361 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1362 ti->tcpi_snd_nxt = tp->snd_nxt; 1363 ti->tcpi_snd_mss = tp->t_maxseg; 1364 ti->tcpi_rcv_mss = tp->t_maxseg; 1365 if (tp->t_flags & TF_TOE) 1366 ti->tcpi_options |= TCPI_OPT_TOE; 1367 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1368 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1369 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1370} 1371 1372/* 1373 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1374 * socket option arguments. When it re-acquires the lock after the copy, it 1375 * has to revalidate that the connection is still valid for the socket 1376 * option. 1377 */ 1378#define INP_WLOCK_RECHECK(inp) do { \ 1379 INP_WLOCK(inp); \ 1380 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1381 INP_WUNLOCK(inp); \ 1382 return (ECONNRESET); \ 1383 } \ 1384 tp = intotcpcb(inp); \ 1385} while(0) 1386 1387int 1388tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1389{ 1390 int error, opt, optval; 1391 u_int ui; 1392 struct inpcb *inp; 1393 struct tcpcb *tp; 1394 struct tcp_info ti; 1395 char buf[TCP_CA_NAME_MAX]; 1396 struct cc_algo *algo; 1397 1398 error = 0; 1399 inp = sotoinpcb(so); 1400 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1401 INP_WLOCK(inp); 1402 if (sopt->sopt_level != IPPROTO_TCP) { 1403#ifdef INET6 1404 if (inp->inp_vflag & INP_IPV6PROTO) { 1405 INP_WUNLOCK(inp); 1406 error = ip6_ctloutput(so, sopt); 1407 } 1408#endif /* INET6 */ 1409#if defined(INET6) && defined(INET) 1410 else 1411#endif 1412#ifdef INET 1413 { 1414 INP_WUNLOCK(inp); 1415 error = ip_ctloutput(so, sopt); 1416 } 1417#endif 1418 return (error); 1419 } 1420 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1421 INP_WUNLOCK(inp); 1422 return (ECONNRESET); 1423 } 1424 1425 switch (sopt->sopt_dir) { 1426 case SOPT_SET: 1427 switch (sopt->sopt_name) { 1428#ifdef TCP_SIGNATURE 1429 case TCP_MD5SIG: 1430 INP_WUNLOCK(inp); 1431 error = sooptcopyin(sopt, &optval, sizeof optval, 1432 sizeof optval); 1433 if (error) 1434 return (error); 1435 1436 INP_WLOCK_RECHECK(inp); 1437 if (optval > 0) 1438 tp->t_flags |= TF_SIGNATURE; 1439 else 1440 tp->t_flags &= ~TF_SIGNATURE; 1441 goto unlock_and_done; 1442#endif /* TCP_SIGNATURE */ 1443 1444 case TCP_NODELAY: 1445 case TCP_NOOPT: 1446 INP_WUNLOCK(inp); 1447 error = sooptcopyin(sopt, &optval, sizeof optval, 1448 sizeof optval); 1449 if (error) 1450 return (error); 1451 1452 INP_WLOCK_RECHECK(inp); 1453 switch (sopt->sopt_name) { 1454 case TCP_NODELAY: 1455 opt = TF_NODELAY; 1456 break; 1457 case TCP_NOOPT: 1458 opt = TF_NOOPT; 1459 break; 1460 default: 1461 opt = 0; /* dead code to fool gcc */ 1462 break; 1463 } 1464 1465 if (optval) 1466 tp->t_flags |= opt; 1467 else 1468 tp->t_flags &= ~opt; 1469unlock_and_done: 1470#ifdef TCP_OFFLOAD 1471 if (tp->t_flags & TF_TOE) { 1472 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1473 sopt->sopt_name); 1474 } 1475#endif 1476 INP_WUNLOCK(inp); 1477 break; 1478 1479 case TCP_NOPUSH: 1480 INP_WUNLOCK(inp); 1481 error = sooptcopyin(sopt, &optval, sizeof optval, 1482 sizeof optval); 1483 if (error) 1484 return (error); 1485 1486 INP_WLOCK_RECHECK(inp); 1487 if (optval) 1488 tp->t_flags |= TF_NOPUSH; 1489 else if (tp->t_flags & TF_NOPUSH) { 1490 tp->t_flags &= ~TF_NOPUSH; 1491 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1492 error = tcp_output(tp); 1493 } 1494 goto unlock_and_done; 1495 1496 case TCP_MAXSEG: 1497 INP_WUNLOCK(inp); 1498 error = sooptcopyin(sopt, &optval, sizeof optval, 1499 sizeof optval); 1500 if (error) 1501 return (error); 1502 1503 INP_WLOCK_RECHECK(inp); 1504 if (optval > 0 && optval <= tp->t_maxseg && 1505 optval + 40 >= V_tcp_minmss) 1506 tp->t_maxseg = optval; 1507 else 1508 error = EINVAL; 1509 goto unlock_and_done; 1510 1511 case TCP_INFO: 1512 INP_WUNLOCK(inp); 1513 error = EINVAL; 1514 break; 1515 1516 case TCP_CONGESTION: 1517 INP_WUNLOCK(inp); 1518 bzero(buf, sizeof(buf)); 1519 error = sooptcopyin(sopt, &buf, sizeof(buf), 1); 1520 if (error) 1521 break; 1522 INP_WLOCK_RECHECK(inp); 1523 /* 1524 * Return EINVAL if we can't find the requested cc algo. 1525 */ 1526 error = EINVAL; 1527 CC_LIST_RLOCK(); 1528 STAILQ_FOREACH(algo, &cc_list, entries) { 1529 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX) 1530 == 0) { 1531 /* We've found the requested algo. */ 1532 error = 0; 1533 /* 1534 * We hold a write lock over the tcb 1535 * so it's safe to do these things 1536 * without ordering concerns. 1537 */ 1538 if (CC_ALGO(tp)->cb_destroy != NULL) 1539 CC_ALGO(tp)->cb_destroy(tp->ccv); 1540 CC_ALGO(tp) = algo; 1541 /* 1542 * If something goes pear shaped 1543 * initialising the new algo, 1544 * fall back to newreno (which 1545 * does not require initialisation). 1546 */ 1547 if (algo->cb_init != NULL) 1548 if (algo->cb_init(tp->ccv) > 0) { 1549 CC_ALGO(tp) = &newreno_cc_algo; 1550 /* 1551 * The only reason init 1552 * should fail is 1553 * because of malloc. 1554 */ 1555 error = ENOMEM; 1556 } 1557 break; /* Break the STAILQ_FOREACH. */ 1558 } 1559 } 1560 CC_LIST_RUNLOCK(); 1561 goto unlock_and_done; 1562 1563 case TCP_KEEPIDLE: 1564 case TCP_KEEPINTVL: 1565 case TCP_KEEPINIT: 1566 INP_WUNLOCK(inp); 1567 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1568 if (error) 1569 return (error); 1570 1571 if (ui > (UINT_MAX / hz)) { 1572 error = EINVAL; 1573 break; 1574 } 1575 ui *= hz; 1576 1577 INP_WLOCK_RECHECK(inp); 1578 switch (sopt->sopt_name) { 1579 case TCP_KEEPIDLE: 1580 tp->t_keepidle = ui; 1581 /* 1582 * XXX: better check current remaining 1583 * timeout and "merge" it with new value. 1584 */ 1585 if ((tp->t_state > TCPS_LISTEN) && 1586 (tp->t_state <= TCPS_CLOSING)) 1587 tcp_timer_activate(tp, TT_KEEP, 1588 TP_KEEPIDLE(tp)); 1589 break; 1590 case TCP_KEEPINTVL: 1591 tp->t_keepintvl = ui; 1592 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1593 (TP_MAXIDLE(tp) > 0)) 1594 tcp_timer_activate(tp, TT_2MSL, 1595 TP_MAXIDLE(tp)); 1596 break; 1597 case TCP_KEEPINIT: 1598 tp->t_keepinit = ui; 1599 if (tp->t_state == TCPS_SYN_RECEIVED || 1600 tp->t_state == TCPS_SYN_SENT) 1601 tcp_timer_activate(tp, TT_KEEP, 1602 TP_KEEPINIT(tp)); 1603 break; 1604 } 1605 goto unlock_and_done; 1606 1607 case TCP_KEEPCNT: 1608 INP_WUNLOCK(inp); 1609 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1610 if (error) 1611 return (error); 1612 1613 INP_WLOCK_RECHECK(inp); 1614 tp->t_keepcnt = ui; 1615 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1616 (TP_MAXIDLE(tp) > 0)) 1617 tcp_timer_activate(tp, TT_2MSL, 1618 TP_MAXIDLE(tp)); 1619 goto unlock_and_done; 1620 1621#ifdef TCP_RFC7413 1622 case TCP_FASTOPEN: 1623 INP_WUNLOCK(inp); 1624 if (!V_tcp_fastopen_enabled) 1625 return (EPERM); 1626 1627 error = sooptcopyin(sopt, &optval, sizeof optval, 1628 sizeof optval); 1629 if (error) 1630 return (error); 1631 1632 INP_WLOCK_RECHECK(inp); 1633 if (optval) { 1634 tp->t_flags |= TF_FASTOPEN; 1635 if ((tp->t_state == TCPS_LISTEN) && 1636 (tp->t_tfo_pending == NULL)) 1637 tp->t_tfo_pending = 1638 tcp_fastopen_alloc_counter(); 1639 } else 1640 tp->t_flags &= ~TF_FASTOPEN; 1641 goto unlock_and_done; 1642#endif 1643 1644 default: 1645 INP_WUNLOCK(inp); 1646 error = ENOPROTOOPT; 1647 break; 1648 } 1649 break; 1650 1651 case SOPT_GET: 1652 tp = intotcpcb(inp); 1653 switch (sopt->sopt_name) { 1654#ifdef TCP_SIGNATURE 1655 case TCP_MD5SIG: 1656 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1657 INP_WUNLOCK(inp); 1658 error = sooptcopyout(sopt, &optval, sizeof optval); 1659 break; 1660#endif 1661 1662 case TCP_NODELAY: 1663 optval = tp->t_flags & TF_NODELAY; 1664 INP_WUNLOCK(inp); 1665 error = sooptcopyout(sopt, &optval, sizeof optval); 1666 break; 1667 case TCP_MAXSEG: 1668 optval = tp->t_maxseg; 1669 INP_WUNLOCK(inp); 1670 error = sooptcopyout(sopt, &optval, sizeof optval); 1671 break; 1672 case TCP_NOOPT: 1673 optval = tp->t_flags & TF_NOOPT; 1674 INP_WUNLOCK(inp); 1675 error = sooptcopyout(sopt, &optval, sizeof optval); 1676 break; 1677 case TCP_NOPUSH: 1678 optval = tp->t_flags & TF_NOPUSH; 1679 INP_WUNLOCK(inp); 1680 error = sooptcopyout(sopt, &optval, sizeof optval); 1681 break; 1682 case TCP_INFO: 1683 tcp_fill_info(tp, &ti); 1684 INP_WUNLOCK(inp); 1685 error = sooptcopyout(sopt, &ti, sizeof ti); 1686 break; 1687 case TCP_CONGESTION: 1688 bzero(buf, sizeof(buf)); 1689 strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1690 INP_WUNLOCK(inp); 1691 error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX); 1692 break; 1693 case TCP_KEEPIDLE: 1694 case TCP_KEEPINTVL: 1695 case TCP_KEEPINIT: 1696 case TCP_KEEPCNT: 1697 switch (sopt->sopt_name) { 1698 case TCP_KEEPIDLE: 1699 ui = tp->t_keepidle / hz; 1700 break; 1701 case TCP_KEEPINTVL: 1702 ui = tp->t_keepintvl / hz; 1703 break; 1704 case TCP_KEEPINIT: 1705 ui = tp->t_keepinit / hz; 1706 break; 1707 case TCP_KEEPCNT: 1708 ui = tp->t_keepcnt; 1709 break; 1710 } 1711 INP_WUNLOCK(inp); 1712 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1713 break; 1714#ifdef TCP_RFC7413 1715 case TCP_FASTOPEN: 1716 optval = tp->t_flags & TF_FASTOPEN; 1717 INP_WUNLOCK(inp); 1718 error = sooptcopyout(sopt, &optval, sizeof optval); 1719 break; 1720#endif 1721 default: 1722 INP_WUNLOCK(inp); 1723 error = ENOPROTOOPT; 1724 break; 1725 } 1726 break; 1727 } 1728 return (error); 1729} 1730#undef INP_WLOCK_RECHECK 1731 1732/* 1733 * Attach TCP protocol to socket, allocating 1734 * internet protocol control block, tcp control block, 1735 * bufer space, and entering LISTEN state if to accept connections. 1736 */ 1737static int 1738tcp_attach(struct socket *so) 1739{ 1740 struct tcpcb *tp; 1741 struct inpcb *inp; 1742 int error; 1743 1744 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1745 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1746 if (error) 1747 return (error); 1748 } 1749 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1750 so->so_snd.sb_flags |= SB_AUTOSIZE; 1751 INP_INFO_RLOCK(&V_tcbinfo); 1752 error = in_pcballoc(so, &V_tcbinfo); 1753 if (error) { 1754 INP_INFO_RUNLOCK(&V_tcbinfo); 1755 return (error); 1756 } 1757 inp = sotoinpcb(so); 1758#ifdef INET6 1759 if (inp->inp_vflag & INP_IPV6PROTO) { 1760 inp->inp_vflag |= INP_IPV6; 1761 inp->in6p_hops = -1; /* use kernel default */ 1762 } 1763 else 1764#endif 1765 inp->inp_vflag |= INP_IPV4; 1766 tp = tcp_newtcpcb(inp); 1767 if (tp == NULL) { 1768 in_pcbdetach(inp); 1769 in_pcbfree(inp); 1770 INP_INFO_RUNLOCK(&V_tcbinfo); 1771 return (ENOBUFS); 1772 } 1773 tp->t_state = TCPS_CLOSED; 1774 INP_WUNLOCK(inp); 1775 INP_INFO_RUNLOCK(&V_tcbinfo); 1776 return (0); 1777} 1778 1779/* 1780 * Initiate (or continue) disconnect. 1781 * If embryonic state, just send reset (once). 1782 * If in ``let data drain'' option and linger null, just drop. 1783 * Otherwise (hard), mark socket disconnecting and drop 1784 * current input data; switch states based on user close, and 1785 * send segment to peer (with FIN). 1786 */ 1787static void 1788tcp_disconnect(struct tcpcb *tp) 1789{ 1790 struct inpcb *inp = tp->t_inpcb; 1791 struct socket *so = inp->inp_socket; 1792 1793 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1794 INP_WLOCK_ASSERT(inp); 1795 1796 /* 1797 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1798 * socket is still open. 1799 */ 1800 if (tp->t_state < TCPS_ESTABLISHED) { 1801 tp = tcp_close(tp); 1802 KASSERT(tp != NULL, 1803 ("tcp_disconnect: tcp_close() returned NULL")); 1804 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1805 tp = tcp_drop(tp, 0); 1806 KASSERT(tp != NULL, 1807 ("tcp_disconnect: tcp_drop() returned NULL")); 1808 } else { 1809 soisdisconnecting(so); 1810 sbflush(&so->so_rcv); 1811 tcp_usrclosed(tp); 1812 if (!(inp->inp_flags & INP_DROPPED)) 1813 tcp_output(tp); 1814 } 1815} 1816 1817/* 1818 * User issued close, and wish to trail through shutdown states: 1819 * if never received SYN, just forget it. If got a SYN from peer, 1820 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1821 * If already got a FIN from peer, then almost done; go to LAST_ACK 1822 * state. In all other cases, have already sent FIN to peer (e.g. 1823 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1824 * for peer to send FIN or not respond to keep-alives, etc. 1825 * We can let the user exit from the close as soon as the FIN is acked. 1826 */ 1827static void 1828tcp_usrclosed(struct tcpcb *tp) 1829{ 1830 1831 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1832 INP_WLOCK_ASSERT(tp->t_inpcb); 1833 1834 switch (tp->t_state) { 1835 case TCPS_LISTEN: 1836#ifdef TCP_OFFLOAD 1837 tcp_offload_listen_stop(tp); 1838#endif 1839 tcp_state_change(tp, TCPS_CLOSED); 1840 /* FALLTHROUGH */ 1841 case TCPS_CLOSED: 1842 tp = tcp_close(tp); 1843 /* 1844 * tcp_close() should never return NULL here as the socket is 1845 * still open. 1846 */ 1847 KASSERT(tp != NULL, 1848 ("tcp_usrclosed: tcp_close() returned NULL")); 1849 break; 1850 1851 case TCPS_SYN_SENT: 1852 case TCPS_SYN_RECEIVED: 1853 tp->t_flags |= TF_NEEDFIN; 1854 break; 1855 1856 case TCPS_ESTABLISHED: 1857 tcp_state_change(tp, TCPS_FIN_WAIT_1); 1858 break; 1859 1860 case TCPS_CLOSE_WAIT: 1861 tcp_state_change(tp, TCPS_LAST_ACK); 1862 break; 1863 } 1864 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1865 soisdisconnected(tp->t_inpcb->inp_socket); 1866 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1867 if (tp->t_state == TCPS_FIN_WAIT_2) { 1868 int timeout; 1869 1870 timeout = (tcp_fast_finwait2_recycle) ? 1871 tcp_finwait2_timeout : TP_MAXIDLE(tp); 1872 tcp_timer_activate(tp, TT_2MSL, timeout); 1873 } 1874 } 1875} 1876 1877#ifdef DDB 1878static void 1879db_print_indent(int indent) 1880{ 1881 int i; 1882 1883 for (i = 0; i < indent; i++) 1884 db_printf(" "); 1885} 1886 1887static void 1888db_print_tstate(int t_state) 1889{ 1890 1891 switch (t_state) { 1892 case TCPS_CLOSED: 1893 db_printf("TCPS_CLOSED"); 1894 return; 1895 1896 case TCPS_LISTEN: 1897 db_printf("TCPS_LISTEN"); 1898 return; 1899 1900 case TCPS_SYN_SENT: 1901 db_printf("TCPS_SYN_SENT"); 1902 return; 1903 1904 case TCPS_SYN_RECEIVED: 1905 db_printf("TCPS_SYN_RECEIVED"); 1906 return; 1907 1908 case TCPS_ESTABLISHED: 1909 db_printf("TCPS_ESTABLISHED"); 1910 return; 1911 1912 case TCPS_CLOSE_WAIT: 1913 db_printf("TCPS_CLOSE_WAIT"); 1914 return; 1915 1916 case TCPS_FIN_WAIT_1: 1917 db_printf("TCPS_FIN_WAIT_1"); 1918 return; 1919 1920 case TCPS_CLOSING: 1921 db_printf("TCPS_CLOSING"); 1922 return; 1923 1924 case TCPS_LAST_ACK: 1925 db_printf("TCPS_LAST_ACK"); 1926 return; 1927 1928 case TCPS_FIN_WAIT_2: 1929 db_printf("TCPS_FIN_WAIT_2"); 1930 return; 1931 1932 case TCPS_TIME_WAIT: 1933 db_printf("TCPS_TIME_WAIT"); 1934 return; 1935 1936 default: 1937 db_printf("unknown"); 1938 return; 1939 } 1940} 1941 1942static void 1943db_print_tflags(u_int t_flags) 1944{ 1945 int comma; 1946 1947 comma = 0; 1948 if (t_flags & TF_ACKNOW) { 1949 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 1950 comma = 1; 1951 } 1952 if (t_flags & TF_DELACK) { 1953 db_printf("%sTF_DELACK", comma ? ", " : ""); 1954 comma = 1; 1955 } 1956 if (t_flags & TF_NODELAY) { 1957 db_printf("%sTF_NODELAY", comma ? ", " : ""); 1958 comma = 1; 1959 } 1960 if (t_flags & TF_NOOPT) { 1961 db_printf("%sTF_NOOPT", comma ? ", " : ""); 1962 comma = 1; 1963 } 1964 if (t_flags & TF_SENTFIN) { 1965 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 1966 comma = 1; 1967 } 1968 if (t_flags & TF_REQ_SCALE) { 1969 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 1970 comma = 1; 1971 } 1972 if (t_flags & TF_RCVD_SCALE) { 1973 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 1974 comma = 1; 1975 } 1976 if (t_flags & TF_REQ_TSTMP) { 1977 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 1978 comma = 1; 1979 } 1980 if (t_flags & TF_RCVD_TSTMP) { 1981 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 1982 comma = 1; 1983 } 1984 if (t_flags & TF_SACK_PERMIT) { 1985 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 1986 comma = 1; 1987 } 1988 if (t_flags & TF_NEEDSYN) { 1989 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 1990 comma = 1; 1991 } 1992 if (t_flags & TF_NEEDFIN) { 1993 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 1994 comma = 1; 1995 } 1996 if (t_flags & TF_NOPUSH) { 1997 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1998 comma = 1; 1999 } 2000 if (t_flags & TF_MORETOCOME) { 2001 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2002 comma = 1; 2003 } 2004 if (t_flags & TF_LQ_OVERFLOW) { 2005 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2006 comma = 1; 2007 } 2008 if (t_flags & TF_LASTIDLE) { 2009 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2010 comma = 1; 2011 } 2012 if (t_flags & TF_RXWIN0SENT) { 2013 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2014 comma = 1; 2015 } 2016 if (t_flags & TF_FASTRECOVERY) { 2017 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2018 comma = 1; 2019 } 2020 if (t_flags & TF_CONGRECOVERY) { 2021 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2022 comma = 1; 2023 } 2024 if (t_flags & TF_WASFRECOVERY) { 2025 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2026 comma = 1; 2027 } 2028 if (t_flags & TF_SIGNATURE) { 2029 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2030 comma = 1; 2031 } 2032 if (t_flags & TF_FORCEDATA) { 2033 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2034 comma = 1; 2035 } 2036 if (t_flags & TF_TSO) { 2037 db_printf("%sTF_TSO", comma ? ", " : ""); 2038 comma = 1; 2039 } 2040 if (t_flags & TF_ECN_PERMIT) { 2041 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2042 comma = 1; 2043 } 2044 if (t_flags & TF_FASTOPEN) { 2045 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2046 comma = 1; 2047 } 2048} 2049 2050static void 2051db_print_toobflags(char t_oobflags) 2052{ 2053 int comma; 2054 2055 comma = 0; 2056 if (t_oobflags & TCPOOB_HAVEDATA) { 2057 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2058 comma = 1; 2059 } 2060 if (t_oobflags & TCPOOB_HADDATA) { 2061 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2062 comma = 1; 2063 } 2064} 2065 2066static void 2067db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2068{ 2069 2070 db_print_indent(indent); 2071 db_printf("%s at %p\n", name, tp); 2072 2073 indent += 2; 2074 2075 db_print_indent(indent); 2076 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2077 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2078 2079 db_print_indent(indent); 2080 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2081 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2082 2083 db_print_indent(indent); 2084 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2085 &tp->t_timers->tt_delack, tp->t_inpcb); 2086 2087 db_print_indent(indent); 2088 db_printf("t_state: %d (", tp->t_state); 2089 db_print_tstate(tp->t_state); 2090 db_printf(")\n"); 2091 2092 db_print_indent(indent); 2093 db_printf("t_flags: 0x%x (", tp->t_flags); 2094 db_print_tflags(tp->t_flags); 2095 db_printf(")\n"); 2096 2097 db_print_indent(indent); 2098 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2099 tp->snd_una, tp->snd_max, tp->snd_nxt); 2100 2101 db_print_indent(indent); 2102 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2103 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2104 2105 db_print_indent(indent); 2106 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2107 tp->iss, tp->irs, tp->rcv_nxt); 2108 2109 db_print_indent(indent); 2110 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2111 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2112 2113 db_print_indent(indent); 2114 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2115 tp->snd_wnd, tp->snd_cwnd); 2116 2117 db_print_indent(indent); 2118 db_printf("snd_ssthresh: %lu snd_recover: " 2119 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2120 2121 db_print_indent(indent); 2122 db_printf("t_maxopd: %u t_rcvtime: %u t_startime: %u\n", 2123 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime); 2124 2125 db_print_indent(indent); 2126 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2127 tp->t_rtttime, tp->t_rtseq); 2128 2129 db_print_indent(indent); 2130 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2131 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2132 2133 db_print_indent(indent); 2134 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2135 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2136 tp->t_rttbest); 2137 2138 db_print_indent(indent); 2139 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2140 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2141 2142 db_print_indent(indent); 2143 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2144 db_print_toobflags(tp->t_oobflags); 2145 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2146 2147 db_print_indent(indent); 2148 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2149 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2150 2151 db_print_indent(indent); 2152 db_printf("ts_recent: %u ts_recent_age: %u\n", 2153 tp->ts_recent, tp->ts_recent_age); 2154 2155 db_print_indent(indent); 2156 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2157 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2158 2159 db_print_indent(indent); 2160 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2161 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2162 tp->snd_recover_prev, tp->t_badrxtwin); 2163 2164 db_print_indent(indent); 2165 db_printf("snd_numholes: %d snd_holes first: %p\n", 2166 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2167 2168 db_print_indent(indent); 2169 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2170 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2171 2172 /* Skip sackblks, sackhint. */ 2173 2174 db_print_indent(indent); 2175 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2176 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2177} 2178 2179DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2180{ 2181 struct tcpcb *tp; 2182 2183 if (!have_addr) { 2184 db_printf("usage: show tcpcb <addr>\n"); 2185 return; 2186 } 2187 tp = (struct tcpcb *)addr; 2188 2189 db_print_tcpcb(tp, "tcpcb", 0); 2190} 2191#endif 2192