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 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_ddb.h" 38 #include "opt_inet.h" 39 #include "opt_inet6.h" 40 #include "opt_tcpdebug.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/malloc.h> 45 #include <sys/kernel.h> 46 #include <sys/sysctl.h> 47 #include <sys/mbuf.h> 48 #ifdef INET6 49 #include <sys/domain.h> 50 #endif /* INET6 */ 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/protosw.h> 54 #include <sys/proc.h> 55 #include <sys/jail.h> 56 #include <sys/vimage.h> 57 58 #ifdef DDB 59 #include <ddb/ddb.h> 60 #endif 61 62 #include <net/if.h> 63 #include <net/route.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #ifdef INET6 68 #include <netinet/ip6.h> 69 #endif 70 #include <netinet/in_pcb.h> 71 #ifdef INET6 72 #include <netinet6/in6_pcb.h> 73 #endif 74 #include <netinet/in_var.h> 75 #include <netinet/ip_var.h> 76 #ifdef INET6 77 #include <netinet6/ip6_var.h> 78 #include <netinet6/scope6_var.h> 79 #endif 80 #include <netinet/tcp.h> 81 #include <netinet/tcp_fsm.h> 82 #include <netinet/tcp_seq.h> 83 #include <netinet/tcp_timer.h> 84 #include <netinet/tcp_var.h> 85 #include <netinet/tcpip.h> 86 #ifdef TCPDEBUG 87 #include <netinet/tcp_debug.h> 88 #endif 89 #include <netinet/tcp_offload.h> 90 #include <netinet/vinet.h> 91 92 /* 93 * TCP protocol interface to socket abstraction. 94 */ 95 static int tcp_attach(struct socket *); 96 static int tcp_connect(struct tcpcb *, struct sockaddr *, 97 struct thread *td); 98 #ifdef INET6 99 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 100 struct thread *td); 101 #endif /* INET6 */ 102 static void tcp_disconnect(struct tcpcb *); 103 static void tcp_usrclosed(struct tcpcb *); 104 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 105 106 #ifdef TCPDEBUG 107 #define TCPDEBUG0 int ostate = 0 108 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 109 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 110 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 111 #else 112 #define TCPDEBUG0 113 #define TCPDEBUG1() 114 #define TCPDEBUG2(req) 115 #endif 116 117 /* 118 * TCP attaches to socket via pru_attach(), reserving space, 119 * and an internet control block. 120 */ 121 static int 122 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 123 { 124 struct inpcb *inp; 125 struct tcpcb *tp = NULL; 126 int error; 127 TCPDEBUG0; 128 129 inp = sotoinpcb(so); 130 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 131 TCPDEBUG1(); 132 133 error = tcp_attach(so); 134 if (error) 135 goto out; 136 137 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 138 so->so_linger = TCP_LINGERTIME; 139 140 inp = sotoinpcb(so); 141 tp = intotcpcb(inp); 142 out: 143 TCPDEBUG2(PRU_ATTACH); 144 return error; 145 } 146 147 /* 148 * tcp_detach is called when the socket layer loses its final reference 149 * to the socket, be it a file descriptor reference, a reference from TCP, 150 * etc. At this point, there is only one case in which we will keep around 151 * inpcb state: time wait. 152 * 153 * This function can probably be re-absorbed back into tcp_usr_detach() now 154 * that there is a single detach path. 155 */ 156 static void 157 tcp_detach(struct socket *so, struct inpcb *inp) 158 { 159 struct tcpcb *tp; 160 #ifdef INVARIANTS 161 INIT_VNET_INET(so->so_vnet); 162 #endif 163 164 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 165 INP_WLOCK_ASSERT(inp); 166 167 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 168 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 169 170 tp = intotcpcb(inp); 171 172 if (inp->inp_vflag & INP_TIMEWAIT) { 173 /* 174 * There are two cases to handle: one in which the time wait 175 * state is being discarded (INP_DROPPED), and one in which 176 * this connection will remain in timewait. In the former, 177 * it is time to discard all state (except tcptw, which has 178 * already been discarded by the timewait close code, which 179 * should be further up the call stack somewhere). In the 180 * latter case, we detach from the socket, but leave the pcb 181 * present until timewait ends. 182 * 183 * XXXRW: Would it be cleaner to free the tcptw here? 184 */ 185 if (inp->inp_vflag & INP_DROPPED) { 186 KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && " 187 "INP_DROPPED && tp != NULL")); 188 in_pcbdetach(inp); 189 in_pcbfree(inp); 190 } else { 191 in_pcbdetach(inp); 192 INP_WUNLOCK(inp); 193 } 194 } else { 195 /* 196 * If the connection is not in timewait, we consider two 197 * two conditions: one in which no further processing is 198 * necessary (dropped || embryonic), and one in which TCP is 199 * not yet done, but no longer requires the socket, so the 200 * pcb will persist for the time being. 201 * 202 * XXXRW: Does the second case still occur? 203 */ 204 if (inp->inp_vflag & INP_DROPPED || 205 tp->t_state < TCPS_SYN_SENT) { 206 tcp_discardcb(tp); 207 in_pcbdetach(inp); 208 in_pcbfree(inp); 209 } else 210 in_pcbdetach(inp); 211 } 212 } 213 214 /* 215 * pru_detach() detaches the TCP protocol from the socket. 216 * If the protocol state is non-embryonic, then can't 217 * do this directly: have to initiate a pru_disconnect(), 218 * which may finish later; embryonic TCB's can just 219 * be discarded here. 220 */ 221 static void 222 tcp_usr_detach(struct socket *so) 223 { 224 INIT_VNET_INET(so->so_vnet); 225 struct inpcb *inp; 226 227 inp = sotoinpcb(so); 228 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 229 INP_INFO_WLOCK(&V_tcbinfo); 230 INP_WLOCK(inp); 231 KASSERT(inp->inp_socket != NULL, 232 ("tcp_usr_detach: inp_socket == NULL")); 233 tcp_detach(so, inp); 234 INP_INFO_WUNLOCK(&V_tcbinfo); 235 } 236 237 /* 238 * Give the socket an address. 239 */ 240 static int 241 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 242 { 243 INIT_VNET_INET(so->so_vnet); 244 int error = 0; 245 struct inpcb *inp; 246 struct tcpcb *tp = NULL; 247 struct sockaddr_in *sinp; 248 249 sinp = (struct sockaddr_in *)nam; 250 if (nam->sa_len != sizeof (*sinp)) 251 return (EINVAL); 252 /* 253 * Must check for multicast addresses and disallow binding 254 * to them. 255 */ 256 if (sinp->sin_family == AF_INET && 257 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 258 return (EAFNOSUPPORT); 259 260 TCPDEBUG0; 261 INP_INFO_WLOCK(&V_tcbinfo); 262 inp = sotoinpcb(so); 263 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 264 INP_WLOCK(inp); 265 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 266 error = EINVAL; 267 goto out; 268 } 269 tp = intotcpcb(inp); 270 TCPDEBUG1(); 271 error = in_pcbbind(inp, nam, td->td_ucred); 272 out: 273 TCPDEBUG2(PRU_BIND); 274 INP_WUNLOCK(inp); 275 INP_INFO_WUNLOCK(&V_tcbinfo); 276 277 return (error); 278 } 279 280 #ifdef INET6 281 static int 282 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 283 { 284 INIT_VNET_INET(so->so_vnet); 285 int error = 0; 286 struct inpcb *inp; 287 struct tcpcb *tp = NULL; 288 struct sockaddr_in6 *sin6p; 289 290 sin6p = (struct sockaddr_in6 *)nam; 291 if (nam->sa_len != sizeof (*sin6p)) 292 return (EINVAL); 293 /* 294 * Must check for multicast addresses and disallow binding 295 * to them. 296 */ 297 if (sin6p->sin6_family == AF_INET6 && 298 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 299 return (EAFNOSUPPORT); 300 301 TCPDEBUG0; 302 INP_INFO_WLOCK(&V_tcbinfo); 303 inp = sotoinpcb(so); 304 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 305 INP_WLOCK(inp); 306 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 307 error = EINVAL; 308 goto out; 309 } 310 tp = intotcpcb(inp); 311 TCPDEBUG1(); 312 inp->inp_vflag &= ~INP_IPV4; 313 inp->inp_vflag |= INP_IPV6; 314 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 315 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 316 inp->inp_vflag |= INP_IPV4; 317 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 318 struct sockaddr_in sin; 319 320 in6_sin6_2_sin(&sin, sin6p); 321 inp->inp_vflag |= INP_IPV4; 322 inp->inp_vflag &= ~INP_IPV6; 323 error = in_pcbbind(inp, (struct sockaddr *)&sin, 324 td->td_ucred); 325 goto out; 326 } 327 } 328 error = in6_pcbbind(inp, nam, td->td_ucred); 329 out: 330 TCPDEBUG2(PRU_BIND); 331 INP_WUNLOCK(inp); 332 INP_INFO_WUNLOCK(&V_tcbinfo); 333 return (error); 334 } 335 #endif /* INET6 */ 336 337 /* 338 * Prepare to accept connections. 339 */ 340 static int 341 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 342 { 343 INIT_VNET_INET(so->so_vnet); 344 int error = 0; 345 struct inpcb *inp; 346 struct tcpcb *tp = NULL; 347 348 TCPDEBUG0; 349 INP_INFO_WLOCK(&V_tcbinfo); 350 inp = sotoinpcb(so); 351 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 352 INP_WLOCK(inp); 353 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 354 error = EINVAL; 355 goto out; 356 } 357 tp = intotcpcb(inp); 358 TCPDEBUG1(); 359 SOCK_LOCK(so); 360 error = solisten_proto_check(so); 361 if (error == 0 && inp->inp_lport == 0) 362 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 363 if (error == 0) { 364 tp->t_state = TCPS_LISTEN; 365 solisten_proto(so, backlog); 366 tcp_offload_listen_open(tp); 367 } 368 SOCK_UNLOCK(so); 369 370 out: 371 TCPDEBUG2(PRU_LISTEN); 372 INP_WUNLOCK(inp); 373 INP_INFO_WUNLOCK(&V_tcbinfo); 374 return (error); 375 } 376 377 #ifdef INET6 378 static int 379 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 380 { 381 INIT_VNET_INET(so->so_vnet); 382 int error = 0; 383 struct inpcb *inp; 384 struct tcpcb *tp = NULL; 385 386 TCPDEBUG0; 387 INP_INFO_WLOCK(&V_tcbinfo); 388 inp = sotoinpcb(so); 389 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 390 INP_WLOCK(inp); 391 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 392 error = EINVAL; 393 goto out; 394 } 395 tp = intotcpcb(inp); 396 TCPDEBUG1(); 397 SOCK_LOCK(so); 398 error = solisten_proto_check(so); 399 if (error == 0 && inp->inp_lport == 0) { 400 inp->inp_vflag &= ~INP_IPV4; 401 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 402 inp->inp_vflag |= INP_IPV4; 403 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 404 } 405 if (error == 0) { 406 tp->t_state = TCPS_LISTEN; 407 solisten_proto(so, backlog); 408 } 409 SOCK_UNLOCK(so); 410 411 out: 412 TCPDEBUG2(PRU_LISTEN); 413 INP_WUNLOCK(inp); 414 INP_INFO_WUNLOCK(&V_tcbinfo); 415 return (error); 416 } 417 #endif /* INET6 */ 418 419 /* 420 * Initiate connection to peer. 421 * Create a template for use in transmissions on this connection. 422 * Enter SYN_SENT state, and mark socket as connecting. 423 * Start keep-alive timer, and seed output sequence space. 424 * Send initial segment on connection. 425 */ 426 static int 427 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 428 { 429 INIT_VNET_INET(so->so_vnet); 430 int error = 0; 431 struct inpcb *inp; 432 struct tcpcb *tp = NULL; 433 struct sockaddr_in *sinp; 434 435 sinp = (struct sockaddr_in *)nam; 436 if (nam->sa_len != sizeof (*sinp)) 437 return (EINVAL); 438 /* 439 * Must disallow TCP ``connections'' to multicast addresses. 440 */ 441 if (sinp->sin_family == AF_INET 442 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 443 return (EAFNOSUPPORT); 444 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 445 return (error); 446 447 TCPDEBUG0; 448 INP_INFO_WLOCK(&V_tcbinfo); 449 inp = sotoinpcb(so); 450 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 451 INP_WLOCK(inp); 452 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 453 error = EINVAL; 454 goto out; 455 } 456 tp = intotcpcb(inp); 457 TCPDEBUG1(); 458 if ((error = tcp_connect(tp, nam, td)) != 0) 459 goto out; 460 error = tcp_output_connect(so, nam); 461 out: 462 TCPDEBUG2(PRU_CONNECT); 463 INP_WUNLOCK(inp); 464 INP_INFO_WUNLOCK(&V_tcbinfo); 465 return (error); 466 } 467 468 #ifdef INET6 469 static int 470 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 471 { 472 INIT_VNET_INET(so->so_vnet); 473 int error = 0; 474 struct inpcb *inp; 475 struct tcpcb *tp = NULL; 476 struct sockaddr_in6 *sin6p; 477 478 TCPDEBUG0; 479 480 sin6p = (struct sockaddr_in6 *)nam; 481 if (nam->sa_len != sizeof (*sin6p)) 482 return (EINVAL); 483 /* 484 * Must disallow TCP ``connections'' to multicast addresses. 485 */ 486 if (sin6p->sin6_family == AF_INET6 487 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 488 return (EAFNOSUPPORT); 489 490 INP_INFO_WLOCK(&V_tcbinfo); 491 inp = sotoinpcb(so); 492 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 493 INP_WLOCK(inp); 494 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 495 error = EINVAL; 496 goto out; 497 } 498 tp = intotcpcb(inp); 499 TCPDEBUG1(); 500 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 501 struct sockaddr_in sin; 502 503 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 504 error = EINVAL; 505 goto out; 506 } 507 508 in6_sin6_2_sin(&sin, sin6p); 509 inp->inp_vflag |= INP_IPV4; 510 inp->inp_vflag &= ~INP_IPV6; 511 if ((error = prison_remote_ip4(td->td_ucred, 512 &sin.sin_addr)) != 0) 513 goto out; 514 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 515 goto out; 516 error = tcp_output_connect(so, nam); 517 goto out; 518 } 519 inp->inp_vflag &= ~INP_IPV4; 520 inp->inp_vflag |= INP_IPV6; 521 inp->inp_inc.inc_flags |= INC_ISIPV6; 522 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 523 goto out; 524 if ((error = tcp6_connect(tp, nam, td)) != 0) 525 goto out; 526 error = tcp_output_connect(so, nam); 527 528 out: 529 TCPDEBUG2(PRU_CONNECT); 530 INP_WUNLOCK(inp); 531 INP_INFO_WUNLOCK(&V_tcbinfo); 532 return (error); 533 } 534 #endif /* INET6 */ 535 536 /* 537 * Initiate disconnect from peer. 538 * If connection never passed embryonic stage, just drop; 539 * else if don't need to let data drain, then can just drop anyways, 540 * else have to begin TCP shutdown process: mark socket disconnecting, 541 * drain unread data, state switch to reflect user close, and 542 * send segment (e.g. FIN) to peer. Socket will be really disconnected 543 * when peer sends FIN and acks ours. 544 * 545 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 546 */ 547 static int 548 tcp_usr_disconnect(struct socket *so) 549 { 550 INIT_VNET_INET(so->so_vnet); 551 struct inpcb *inp; 552 struct tcpcb *tp = NULL; 553 int error = 0; 554 555 TCPDEBUG0; 556 INP_INFO_WLOCK(&V_tcbinfo); 557 inp = sotoinpcb(so); 558 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 559 INP_WLOCK(inp); 560 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 561 error = ECONNRESET; 562 goto out; 563 } 564 tp = intotcpcb(inp); 565 TCPDEBUG1(); 566 tcp_disconnect(tp); 567 out: 568 TCPDEBUG2(PRU_DISCONNECT); 569 INP_WUNLOCK(inp); 570 INP_INFO_WUNLOCK(&V_tcbinfo); 571 return (error); 572 } 573 574 /* 575 * Accept a connection. Essentially all the work is 576 * done at higher levels; just return the address 577 * of the peer, storing through addr. 578 */ 579 static int 580 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 581 { 582 INIT_VNET_INET(so->so_vnet); 583 int error = 0; 584 struct inpcb *inp = NULL; 585 struct tcpcb *tp = NULL; 586 struct in_addr addr; 587 in_port_t port = 0; 588 TCPDEBUG0; 589 590 if (so->so_state & SS_ISDISCONNECTED) 591 return (ECONNABORTED); 592 593 inp = sotoinpcb(so); 594 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 595 INP_INFO_RLOCK(&V_tcbinfo); 596 INP_WLOCK(inp); 597 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 598 error = ECONNABORTED; 599 goto out; 600 } 601 tp = intotcpcb(inp); 602 TCPDEBUG1(); 603 604 /* 605 * We inline in_getpeeraddr and COMMON_END here, so that we can 606 * copy the data of interest and defer the malloc until after we 607 * release the lock. 608 */ 609 port = inp->inp_fport; 610 addr = inp->inp_faddr; 611 612 out: 613 TCPDEBUG2(PRU_ACCEPT); 614 INP_WUNLOCK(inp); 615 INP_INFO_RUNLOCK(&V_tcbinfo); 616 if (error == 0) 617 *nam = in_sockaddr(port, &addr); 618 return error; 619 } 620 621 #ifdef INET6 622 static int 623 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 624 { 625 struct inpcb *inp = NULL; 626 int error = 0; 627 struct tcpcb *tp = NULL; 628 struct in_addr addr; 629 struct in6_addr addr6; 630 in_port_t port = 0; 631 int v4 = 0; 632 TCPDEBUG0; 633 634 if (so->so_state & SS_ISDISCONNECTED) 635 return (ECONNABORTED); 636 637 inp = sotoinpcb(so); 638 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 639 INP_WLOCK(inp); 640 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 641 error = ECONNABORTED; 642 goto out; 643 } 644 tp = intotcpcb(inp); 645 TCPDEBUG1(); 646 647 /* 648 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 649 * copy the data of interest and defer the malloc until after we 650 * release the lock. 651 */ 652 if (inp->inp_vflag & INP_IPV4) { 653 v4 = 1; 654 port = inp->inp_fport; 655 addr = inp->inp_faddr; 656 } else { 657 port = inp->inp_fport; 658 addr6 = inp->in6p_faddr; 659 } 660 661 out: 662 TCPDEBUG2(PRU_ACCEPT); 663 INP_WUNLOCK(inp); 664 if (error == 0) { 665 if (v4) 666 *nam = in6_v4mapsin6_sockaddr(port, &addr); 667 else 668 *nam = in6_sockaddr(port, &addr6); 669 } 670 return error; 671 } 672 #endif /* INET6 */ 673 674 /* 675 * Mark the connection as being incapable of further output. 676 */ 677 static int 678 tcp_usr_shutdown(struct socket *so) 679 { 680 INIT_VNET_INET(so->so_vnet); 681 int error = 0; 682 struct inpcb *inp; 683 struct tcpcb *tp = NULL; 684 685 TCPDEBUG0; 686 INP_INFO_WLOCK(&V_tcbinfo); 687 inp = sotoinpcb(so); 688 KASSERT(inp != NULL, ("inp == NULL")); 689 INP_WLOCK(inp); 690 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 691 error = ECONNRESET; 692 goto out; 693 } 694 tp = intotcpcb(inp); 695 TCPDEBUG1(); 696 socantsendmore(so); 697 tcp_usrclosed(tp); 698 error = tcp_output_disconnect(tp); 699 700 out: 701 TCPDEBUG2(PRU_SHUTDOWN); 702 INP_WUNLOCK(inp); 703 INP_INFO_WUNLOCK(&V_tcbinfo); 704 705 return (error); 706 } 707 708 /* 709 * After a receive, possibly send window update to peer. 710 */ 711 static int 712 tcp_usr_rcvd(struct socket *so, int flags) 713 { 714 struct inpcb *inp; 715 struct tcpcb *tp = NULL; 716 int error = 0; 717 718 TCPDEBUG0; 719 inp = sotoinpcb(so); 720 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 721 INP_WLOCK(inp); 722 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 723 error = ECONNRESET; 724 goto out; 725 } 726 tp = intotcpcb(inp); 727 TCPDEBUG1(); 728 tcp_output_rcvd(tp); 729 730 out: 731 TCPDEBUG2(PRU_RCVD); 732 INP_WUNLOCK(inp); 733 return (error); 734 } 735 736 /* 737 * Do a send by putting data in output queue and updating urgent 738 * marker if URG set. Possibly send more data. Unlike the other 739 * pru_*() routines, the mbuf chains are our responsibility. We 740 * must either enqueue them or free them. The other pru_* routines 741 * generally are caller-frees. 742 */ 743 static int 744 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 745 struct sockaddr *nam, struct mbuf *control, struct thread *td) 746 { 747 INIT_VNET_INET(so->so_vnet); 748 int error = 0; 749 struct inpcb *inp; 750 struct tcpcb *tp = NULL; 751 int headlocked = 0; 752 #ifdef INET6 753 int isipv6; 754 #endif 755 TCPDEBUG0; 756 757 /* 758 * We require the pcbinfo lock in two cases: 759 * 760 * (1) An implied connect is taking place, which can result in 761 * binding IPs and ports and hence modification of the pcb hash 762 * chains. 763 * 764 * (2) PRUS_EOF is set, resulting in explicit close on the send. 765 */ 766 if ((nam != NULL) || (flags & PRUS_EOF)) { 767 INP_INFO_WLOCK(&V_tcbinfo); 768 headlocked = 1; 769 } 770 inp = sotoinpcb(so); 771 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 772 INP_WLOCK(inp); 773 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 774 if (control) 775 m_freem(control); 776 if (m) 777 m_freem(m); 778 error = ECONNRESET; 779 goto out; 780 } 781 #ifdef INET6 782 isipv6 = nam && nam->sa_family == AF_INET6; 783 #endif /* INET6 */ 784 tp = intotcpcb(inp); 785 TCPDEBUG1(); 786 if (control) { 787 /* TCP doesn't do control messages (rights, creds, etc) */ 788 if (control->m_len) { 789 m_freem(control); 790 if (m) 791 m_freem(m); 792 error = EINVAL; 793 goto out; 794 } 795 m_freem(control); /* empty control, just free it */ 796 } 797 if (!(flags & PRUS_OOB)) { 798 sbappendstream(&so->so_snd, m); 799 if (nam && tp->t_state < TCPS_SYN_SENT) { 800 /* 801 * Do implied connect if not yet connected, 802 * initialize window to default value, and 803 * initialize maxseg/maxopd using peer's cached 804 * MSS. 805 */ 806 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 807 #ifdef INET6 808 if (isipv6) 809 error = tcp6_connect(tp, nam, td); 810 else 811 #endif /* INET6 */ 812 error = tcp_connect(tp, nam, td); 813 if (error) 814 goto out; 815 tp->snd_wnd = TTCP_CLIENT_SND_WND; 816 tcp_mss(tp, -1); 817 } 818 if (flags & PRUS_EOF) { 819 /* 820 * Close the send side of the connection after 821 * the data is sent. 822 */ 823 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 824 socantsendmore(so); 825 tcp_usrclosed(tp); 826 } 827 if (headlocked) { 828 INP_INFO_WUNLOCK(&V_tcbinfo); 829 headlocked = 0; 830 } 831 if (tp != NULL) { 832 if (flags & PRUS_MORETOCOME) 833 tp->t_flags |= TF_MORETOCOME; 834 error = tcp_output_send(tp); 835 if (flags & PRUS_MORETOCOME) 836 tp->t_flags &= ~TF_MORETOCOME; 837 } 838 } else { 839 /* 840 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 841 */ 842 SOCKBUF_LOCK(&so->so_snd); 843 if (sbspace(&so->so_snd) < -512) { 844 SOCKBUF_UNLOCK(&so->so_snd); 845 m_freem(m); 846 error = ENOBUFS; 847 goto out; 848 } 849 /* 850 * According to RFC961 (Assigned Protocols), 851 * the urgent pointer points to the last octet 852 * of urgent data. We continue, however, 853 * to consider it to indicate the first octet 854 * of data past the urgent section. 855 * Otherwise, snd_up should be one lower. 856 */ 857 sbappendstream_locked(&so->so_snd, m); 858 SOCKBUF_UNLOCK(&so->so_snd); 859 if (nam && tp->t_state < TCPS_SYN_SENT) { 860 /* 861 * Do implied connect if not yet connected, 862 * initialize window to default value, and 863 * initialize maxseg/maxopd using peer's cached 864 * MSS. 865 */ 866 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 867 #ifdef INET6 868 if (isipv6) 869 error = tcp6_connect(tp, nam, td); 870 else 871 #endif /* INET6 */ 872 error = tcp_connect(tp, nam, td); 873 if (error) 874 goto out; 875 tp->snd_wnd = TTCP_CLIENT_SND_WND; 876 tcp_mss(tp, -1); 877 INP_INFO_WUNLOCK(&V_tcbinfo); 878 headlocked = 0; 879 } else if (nam) { 880 INP_INFO_WUNLOCK(&V_tcbinfo); 881 headlocked = 0; 882 } 883 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 884 tp->t_flags |= TF_FORCEDATA; 885 error = tcp_output_send(tp); 886 tp->t_flags &= ~TF_FORCEDATA; 887 } 888 out: 889 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 890 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 891 INP_WUNLOCK(inp); 892 if (headlocked) 893 INP_INFO_WUNLOCK(&V_tcbinfo); 894 return (error); 895 } 896 897 /* 898 * Abort the TCP. Drop the connection abruptly. 899 */ 900 static void 901 tcp_usr_abort(struct socket *so) 902 { 903 INIT_VNET_INET(so->so_vnet); 904 struct inpcb *inp; 905 struct tcpcb *tp = NULL; 906 TCPDEBUG0; 907 908 inp = sotoinpcb(so); 909 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 910 911 INP_INFO_WLOCK(&V_tcbinfo); 912 INP_WLOCK(inp); 913 KASSERT(inp->inp_socket != NULL, 914 ("tcp_usr_abort: inp_socket == NULL")); 915 916 /* 917 * If we still have full TCP state, and we're not dropped, drop. 918 */ 919 if (!(inp->inp_vflag & INP_TIMEWAIT) && 920 !(inp->inp_vflag & INP_DROPPED)) { 921 tp = intotcpcb(inp); 922 TCPDEBUG1(); 923 tcp_drop(tp, ECONNABORTED); 924 TCPDEBUG2(PRU_ABORT); 925 } 926 if (!(inp->inp_vflag & INP_DROPPED)) { 927 SOCK_LOCK(so); 928 so->so_state |= SS_PROTOREF; 929 SOCK_UNLOCK(so); 930 inp->inp_vflag |= INP_SOCKREF; 931 } 932 INP_WUNLOCK(inp); 933 INP_INFO_WUNLOCK(&V_tcbinfo); 934 } 935 936 /* 937 * TCP socket is closed. Start friendly disconnect. 938 */ 939 static void 940 tcp_usr_close(struct socket *so) 941 { 942 INIT_VNET_INET(so->so_vnet); 943 struct inpcb *inp; 944 struct tcpcb *tp = NULL; 945 TCPDEBUG0; 946 947 inp = sotoinpcb(so); 948 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 949 950 INP_INFO_WLOCK(&V_tcbinfo); 951 INP_WLOCK(inp); 952 KASSERT(inp->inp_socket != NULL, 953 ("tcp_usr_close: inp_socket == NULL")); 954 955 /* 956 * If we still have full TCP state, and we're not dropped, initiate 957 * a disconnect. 958 */ 959 if (!(inp->inp_vflag & INP_TIMEWAIT) && 960 !(inp->inp_vflag & INP_DROPPED)) { 961 tp = intotcpcb(inp); 962 TCPDEBUG1(); 963 tcp_disconnect(tp); 964 TCPDEBUG2(PRU_CLOSE); 965 } 966 if (!(inp->inp_vflag & INP_DROPPED)) { 967 SOCK_LOCK(so); 968 so->so_state |= SS_PROTOREF; 969 SOCK_UNLOCK(so); 970 inp->inp_vflag |= INP_SOCKREF; 971 } 972 INP_WUNLOCK(inp); 973 INP_INFO_WUNLOCK(&V_tcbinfo); 974 } 975 976 /* 977 * Receive out-of-band data. 978 */ 979 static int 980 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 981 { 982 int error = 0; 983 struct inpcb *inp; 984 struct tcpcb *tp = NULL; 985 986 TCPDEBUG0; 987 inp = sotoinpcb(so); 988 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 989 INP_WLOCK(inp); 990 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 991 error = ECONNRESET; 992 goto out; 993 } 994 tp = intotcpcb(inp); 995 TCPDEBUG1(); 996 if ((so->so_oobmark == 0 && 997 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 998 so->so_options & SO_OOBINLINE || 999 tp->t_oobflags & TCPOOB_HADDATA) { 1000 error = EINVAL; 1001 goto out; 1002 } 1003 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1004 error = EWOULDBLOCK; 1005 goto out; 1006 } 1007 m->m_len = 1; 1008 *mtod(m, caddr_t) = tp->t_iobc; 1009 if ((flags & MSG_PEEK) == 0) 1010 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1011 1012 out: 1013 TCPDEBUG2(PRU_RCVOOB); 1014 INP_WUNLOCK(inp); 1015 return (error); 1016 } 1017 1018 struct pr_usrreqs tcp_usrreqs = { 1019 .pru_abort = tcp_usr_abort, 1020 .pru_accept = tcp_usr_accept, 1021 .pru_attach = tcp_usr_attach, 1022 .pru_bind = tcp_usr_bind, 1023 .pru_connect = tcp_usr_connect, 1024 .pru_control = in_control, 1025 .pru_detach = tcp_usr_detach, 1026 .pru_disconnect = tcp_usr_disconnect, 1027 .pru_listen = tcp_usr_listen, 1028 .pru_peeraddr = in_getpeeraddr, 1029 .pru_rcvd = tcp_usr_rcvd, 1030 .pru_rcvoob = tcp_usr_rcvoob, 1031 .pru_send = tcp_usr_send, 1032 .pru_shutdown = tcp_usr_shutdown, 1033 .pru_sockaddr = in_getsockaddr, 1034 .pru_sosetlabel = in_pcbsosetlabel, 1035 .pru_close = tcp_usr_close, 1036 }; 1037 1038 #ifdef INET6 1039 struct pr_usrreqs tcp6_usrreqs = { 1040 .pru_abort = tcp_usr_abort, 1041 .pru_accept = tcp6_usr_accept, 1042 .pru_attach = tcp_usr_attach, 1043 .pru_bind = tcp6_usr_bind, 1044 .pru_connect = tcp6_usr_connect, 1045 .pru_control = in6_control, 1046 .pru_detach = tcp_usr_detach, 1047 .pru_disconnect = tcp_usr_disconnect, 1048 .pru_listen = tcp6_usr_listen, 1049 .pru_peeraddr = in6_mapped_peeraddr, 1050 .pru_rcvd = tcp_usr_rcvd, 1051 .pru_rcvoob = tcp_usr_rcvoob, 1052 .pru_send = tcp_usr_send, 1053 .pru_shutdown = tcp_usr_shutdown, 1054 .pru_sockaddr = in6_mapped_sockaddr, 1055 .pru_sosetlabel = in_pcbsosetlabel, 1056 .pru_close = tcp_usr_close, 1057 }; 1058 #endif /* INET6 */ 1059 1060 /* 1061 * Common subroutine to open a TCP connection to remote host specified 1062 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1063 * port number if needed. Call in_pcbconnect_setup to do the routing and 1064 * to choose a local host address (interface). If there is an existing 1065 * incarnation of the same connection in TIME-WAIT state and if the remote 1066 * host was sending CC options and if the connection duration was < MSL, then 1067 * truncate the previous TIME-WAIT state and proceed. 1068 * Initialize connection parameters and enter SYN-SENT state. 1069 */ 1070 static int 1071 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1072 { 1073 struct inpcb *inp = tp->t_inpcb, *oinp; 1074 struct socket *so = inp->inp_socket; 1075 INIT_VNET_INET(so->so_vnet); 1076 struct in_addr laddr; 1077 u_short lport; 1078 int error; 1079 1080 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1081 INP_WLOCK_ASSERT(inp); 1082 1083 if (inp->inp_lport == 0) { 1084 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1085 if (error) 1086 return error; 1087 } 1088 1089 /* 1090 * Cannot simply call in_pcbconnect, because there might be an 1091 * earlier incarnation of this same connection still in 1092 * TIME_WAIT state, creating an ADDRINUSE error. 1093 */ 1094 laddr = inp->inp_laddr; 1095 lport = inp->inp_lport; 1096 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1097 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1098 if (error && oinp == NULL) 1099 return error; 1100 if (oinp) 1101 return EADDRINUSE; 1102 inp->inp_laddr = laddr; 1103 in_pcbrehash(inp); 1104 1105 /* 1106 * Compute window scaling to request: 1107 * Scale to fit into sweet spot. See tcp_syncache.c. 1108 * XXX: This should move to tcp_output(). 1109 */ 1110 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1111 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1112 tp->request_r_scale++; 1113 1114 soisconnecting(so); 1115 V_tcpstat.tcps_connattempt++; 1116 tp->t_state = TCPS_SYN_SENT; 1117 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit); 1118 tp->iss = tcp_new_isn(tp); 1119 tp->t_bw_rtseq = tp->iss; 1120 tcp_sendseqinit(tp); 1121 1122 return 0; 1123 } 1124 1125 #ifdef INET6 1126 static int 1127 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1128 { 1129 struct inpcb *inp = tp->t_inpcb, *oinp; 1130 struct socket *so = inp->inp_socket; 1131 INIT_VNET_INET(so->so_vnet); 1132 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1133 struct in6_addr *addr6; 1134 int error; 1135 1136 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1137 INP_WLOCK_ASSERT(inp); 1138 1139 if (inp->inp_lport == 0) { 1140 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1141 if (error) 1142 return error; 1143 } 1144 1145 /* 1146 * Cannot simply call in_pcbconnect, because there might be an 1147 * earlier incarnation of this same connection still in 1148 * TIME_WAIT state, creating an ADDRINUSE error. 1149 * in6_pcbladdr() also handles scope zone IDs. 1150 */ 1151 error = in6_pcbladdr(inp, nam, &addr6); 1152 if (error) 1153 return error; 1154 oinp = in6_pcblookup_hash(inp->inp_pcbinfo, 1155 &sin6->sin6_addr, sin6->sin6_port, 1156 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 1157 ? addr6 1158 : &inp->in6p_laddr, 1159 inp->inp_lport, 0, NULL); 1160 if (oinp) 1161 return EADDRINUSE; 1162 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1163 inp->in6p_laddr = *addr6; 1164 inp->in6p_faddr = sin6->sin6_addr; 1165 inp->inp_fport = sin6->sin6_port; 1166 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 1167 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 1168 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 1169 inp->inp_flow |= 1170 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 1171 in_pcbrehash(inp); 1172 1173 /* Compute window scaling to request. */ 1174 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1175 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 1176 tp->request_r_scale++; 1177 1178 soisconnecting(so); 1179 V_tcpstat.tcps_connattempt++; 1180 tp->t_state = TCPS_SYN_SENT; 1181 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit); 1182 tp->iss = tcp_new_isn(tp); 1183 tp->t_bw_rtseq = tp->iss; 1184 tcp_sendseqinit(tp); 1185 1186 return 0; 1187 } 1188 #endif /* INET6 */ 1189 1190 /* 1191 * Export TCP internal state information via a struct tcp_info, based on the 1192 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1193 * (TCP state machine, etc). We export all information using FreeBSD-native 1194 * constants -- for example, the numeric values for tcpi_state will differ 1195 * from Linux. 1196 */ 1197 static void 1198 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1199 { 1200 1201 INP_WLOCK_ASSERT(tp->t_inpcb); 1202 bzero(ti, sizeof(*ti)); 1203 1204 ti->tcpi_state = tp->t_state; 1205 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1206 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1207 if (tp->t_flags & TF_SACK_PERMIT) 1208 ti->tcpi_options |= TCPI_OPT_SACK; 1209 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1210 ti->tcpi_options |= TCPI_OPT_WSCALE; 1211 ti->tcpi_snd_wscale = tp->snd_scale; 1212 ti->tcpi_rcv_wscale = tp->rcv_scale; 1213 } 1214 1215 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1216 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1217 1218 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1219 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1220 1221 /* 1222 * FreeBSD-specific extension fields for tcp_info. 1223 */ 1224 ti->tcpi_rcv_space = tp->rcv_wnd; 1225 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1226 ti->tcpi_snd_wnd = tp->snd_wnd; 1227 ti->tcpi_snd_bwnd = tp->snd_bwnd; 1228 ti->tcpi_snd_nxt = tp->snd_nxt; 1229 ti->__tcpi_snd_mss = tp->t_maxseg; 1230 ti->__tcpi_rcv_mss = tp->t_maxseg; 1231 if (tp->t_flags & TF_TOE) 1232 ti->tcpi_options |= TCPI_OPT_TOE; 1233 } 1234 1235 /* 1236 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1237 * socket option arguments. When it re-acquires the lock after the copy, it 1238 * has to revalidate that the connection is still valid for the socket 1239 * option. 1240 */ 1241 #define INP_WLOCK_RECHECK(inp) do { \ 1242 INP_WLOCK(inp); \ 1243 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { \ 1244 INP_WUNLOCK(inp); \ 1245 return (ECONNRESET); \ 1246 } \ 1247 tp = intotcpcb(inp); \ 1248 } while(0) 1249 1250 int 1251 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1252 { 1253 INIT_VNET_INET(so->so_vnet); 1254 int error, opt, optval; 1255 struct inpcb *inp; 1256 struct tcpcb *tp; 1257 struct tcp_info ti; 1258 1259 error = 0; 1260 inp = sotoinpcb(so); 1261 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1262 INP_WLOCK(inp); 1263 if (sopt->sopt_level != IPPROTO_TCP) { 1264 #ifdef INET6 1265 if (inp->inp_vflag & INP_IPV6PROTO) { 1266 INP_WUNLOCK(inp); 1267 error = ip6_ctloutput(so, sopt); 1268 } else { 1269 #endif /* INET6 */ 1270 INP_WUNLOCK(inp); 1271 error = ip_ctloutput(so, sopt); 1272 #ifdef INET6 1273 } 1274 #endif 1275 return (error); 1276 } 1277 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 1278 INP_WUNLOCK(inp); 1279 return (ECONNRESET); 1280 } 1281 1282 switch (sopt->sopt_dir) { 1283 case SOPT_SET: 1284 switch (sopt->sopt_name) { 1285 #ifdef TCP_SIGNATURE 1286 case TCP_MD5SIG: 1287 INP_WUNLOCK(inp); 1288 error = sooptcopyin(sopt, &optval, sizeof optval, 1289 sizeof optval); 1290 if (error) 1291 return (error); 1292 1293 INP_WLOCK_RECHECK(inp); 1294 if (optval > 0) 1295 tp->t_flags |= TF_SIGNATURE; 1296 else 1297 tp->t_flags &= ~TF_SIGNATURE; 1298 INP_WUNLOCK(inp); 1299 break; 1300 #endif /* TCP_SIGNATURE */ 1301 case TCP_NODELAY: 1302 case TCP_NOOPT: 1303 INP_WUNLOCK(inp); 1304 error = sooptcopyin(sopt, &optval, sizeof optval, 1305 sizeof optval); 1306 if (error) 1307 return (error); 1308 1309 INP_WLOCK_RECHECK(inp); 1310 switch (sopt->sopt_name) { 1311 case TCP_NODELAY: 1312 opt = TF_NODELAY; 1313 break; 1314 case TCP_NOOPT: 1315 opt = TF_NOOPT; 1316 break; 1317 default: 1318 opt = 0; /* dead code to fool gcc */ 1319 break; 1320 } 1321 1322 if (optval) 1323 tp->t_flags |= opt; 1324 else 1325 tp->t_flags &= ~opt; 1326 INP_WUNLOCK(inp); 1327 break; 1328 1329 case TCP_NOPUSH: 1330 INP_WUNLOCK(inp); 1331 error = sooptcopyin(sopt, &optval, sizeof optval, 1332 sizeof optval); 1333 if (error) 1334 return (error); 1335 1336 INP_WLOCK_RECHECK(inp); 1337 if (optval) 1338 tp->t_flags |= TF_NOPUSH; 1339 else { 1340 tp->t_flags &= ~TF_NOPUSH; 1341 error = tcp_output(tp); 1342 } 1343 INP_WUNLOCK(inp); 1344 break; 1345 1346 case TCP_MAXSEG: 1347 INP_WUNLOCK(inp); 1348 error = sooptcopyin(sopt, &optval, sizeof optval, 1349 sizeof optval); 1350 if (error) 1351 return (error); 1352 1353 INP_WLOCK_RECHECK(inp); 1354 if (optval > 0 && optval <= tp->t_maxseg && 1355 optval + 40 >= V_tcp_minmss) 1356 tp->t_maxseg = optval; 1357 else 1358 error = EINVAL; 1359 INP_WUNLOCK(inp); 1360 break; 1361 1362 case TCP_INFO: 1363 INP_WUNLOCK(inp); 1364 error = EINVAL; 1365 break; 1366 1367 default: 1368 INP_WUNLOCK(inp); 1369 error = ENOPROTOOPT; 1370 break; 1371 } 1372 break; 1373 1374 case SOPT_GET: 1375 tp = intotcpcb(inp); 1376 switch (sopt->sopt_name) { 1377 #ifdef TCP_SIGNATURE 1378 case TCP_MD5SIG: 1379 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1380 INP_WUNLOCK(inp); 1381 error = sooptcopyout(sopt, &optval, sizeof optval); 1382 break; 1383 #endif 1384 1385 case TCP_NODELAY: 1386 optval = tp->t_flags & TF_NODELAY; 1387 INP_WUNLOCK(inp); 1388 error = sooptcopyout(sopt, &optval, sizeof optval); 1389 break; 1390 case TCP_MAXSEG: 1391 optval = tp->t_maxseg; 1392 INP_WUNLOCK(inp); 1393 error = sooptcopyout(sopt, &optval, sizeof optval); 1394 break; 1395 case TCP_NOOPT: 1396 optval = tp->t_flags & TF_NOOPT; 1397 INP_WUNLOCK(inp); 1398 error = sooptcopyout(sopt, &optval, sizeof optval); 1399 break; 1400 case TCP_NOPUSH: 1401 optval = tp->t_flags & TF_NOPUSH; 1402 INP_WUNLOCK(inp); 1403 error = sooptcopyout(sopt, &optval, sizeof optval); 1404 break; 1405 case TCP_INFO: 1406 tcp_fill_info(tp, &ti); 1407 INP_WUNLOCK(inp); 1408 error = sooptcopyout(sopt, &ti, sizeof ti); 1409 break; 1410 default: 1411 INP_WUNLOCK(inp); 1412 error = ENOPROTOOPT; 1413 break; 1414 } 1415 break; 1416 } 1417 return (error); 1418 } 1419 #undef INP_WLOCK_RECHECK 1420 1421 /* 1422 * tcp_sendspace and tcp_recvspace are the default send and receive window 1423 * sizes, respectively. These are obsolescent (this information should 1424 * be set by the route). 1425 */ 1426 u_long tcp_sendspace = 1024*32; 1427 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1428 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1429 u_long tcp_recvspace = 1024*64; 1430 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1431 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1432 1433 /* 1434 * Attach TCP protocol to socket, allocating 1435 * internet protocol control block, tcp control block, 1436 * bufer space, and entering LISTEN state if to accept connections. 1437 */ 1438 static int 1439 tcp_attach(struct socket *so) 1440 { 1441 INIT_VNET_INET(so->so_vnet); 1442 struct tcpcb *tp; 1443 struct inpcb *inp; 1444 int error; 1445 1446 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1447 error = soreserve(so, tcp_sendspace, tcp_recvspace); 1448 if (error) 1449 return (error); 1450 } 1451 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1452 so->so_snd.sb_flags |= SB_AUTOSIZE; 1453 INP_INFO_WLOCK(&V_tcbinfo); 1454 error = in_pcballoc(so, &V_tcbinfo); 1455 if (error) { 1456 INP_INFO_WUNLOCK(&V_tcbinfo); 1457 return (error); 1458 } 1459 inp = sotoinpcb(so); 1460 #ifdef INET6 1461 if (inp->inp_vflag & INP_IPV6PROTO) { 1462 inp->inp_vflag |= INP_IPV6; 1463 inp->in6p_hops = -1; /* use kernel default */ 1464 } 1465 else 1466 #endif 1467 inp->inp_vflag |= INP_IPV4; 1468 tp = tcp_newtcpcb(inp); 1469 if (tp == NULL) { 1470 in_pcbdetach(inp); 1471 in_pcbfree(inp); 1472 INP_INFO_WUNLOCK(&V_tcbinfo); 1473 return (ENOBUFS); 1474 } 1475 tp->t_state = TCPS_CLOSED; 1476 INP_WUNLOCK(inp); 1477 INP_INFO_WUNLOCK(&V_tcbinfo); 1478 return (0); 1479 } 1480 1481 /* 1482 * Initiate (or continue) disconnect. 1483 * If embryonic state, just send reset (once). 1484 * If in ``let data drain'' option and linger null, just drop. 1485 * Otherwise (hard), mark socket disconnecting and drop 1486 * current input data; switch states based on user close, and 1487 * send segment to peer (with FIN). 1488 */ 1489 static void 1490 tcp_disconnect(struct tcpcb *tp) 1491 { 1492 struct inpcb *inp = tp->t_inpcb; 1493 struct socket *so = inp->inp_socket; 1494 #ifdef INVARIANTS 1495 INIT_VNET_INET(so->so_vnet); 1496 #endif 1497 1498 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1499 INP_WLOCK_ASSERT(inp); 1500 1501 /* 1502 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1503 * socket is still open. 1504 */ 1505 if (tp->t_state < TCPS_ESTABLISHED) { 1506 tp = tcp_close(tp); 1507 KASSERT(tp != NULL, 1508 ("tcp_disconnect: tcp_close() returned NULL")); 1509 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1510 tp = tcp_drop(tp, 0); 1511 KASSERT(tp != NULL, 1512 ("tcp_disconnect: tcp_drop() returned NULL")); 1513 } else { 1514 soisdisconnecting(so); 1515 sbflush(&so->so_rcv); 1516 tcp_usrclosed(tp); 1517 if (!(inp->inp_vflag & INP_DROPPED)) 1518 tcp_output_disconnect(tp); 1519 } 1520 } 1521 1522 /* 1523 * User issued close, and wish to trail through shutdown states: 1524 * if never received SYN, just forget it. If got a SYN from peer, 1525 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1526 * If already got a FIN from peer, then almost done; go to LAST_ACK 1527 * state. In all other cases, have already sent FIN to peer (e.g. 1528 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1529 * for peer to send FIN or not respond to keep-alives, etc. 1530 * We can let the user exit from the close as soon as the FIN is acked. 1531 */ 1532 static void 1533 tcp_usrclosed(struct tcpcb *tp) 1534 { 1535 #ifdef INVARIANTS 1536 INIT_VNET_INET(tp->t_inpcb->inp_vnet); 1537 #endif 1538 1539 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1540 INP_WLOCK_ASSERT(tp->t_inpcb); 1541 1542 switch (tp->t_state) { 1543 case TCPS_LISTEN: 1544 tcp_offload_listen_close(tp); 1545 /* FALLTHROUGH */ 1546 case TCPS_CLOSED: 1547 tp->t_state = TCPS_CLOSED; 1548 tp = tcp_close(tp); 1549 /* 1550 * tcp_close() should never return NULL here as the socket is 1551 * still open. 1552 */ 1553 KASSERT(tp != NULL, 1554 ("tcp_usrclosed: tcp_close() returned NULL")); 1555 break; 1556 1557 case TCPS_SYN_SENT: 1558 case TCPS_SYN_RECEIVED: 1559 tp->t_flags |= TF_NEEDFIN; 1560 break; 1561 1562 case TCPS_ESTABLISHED: 1563 tp->t_state = TCPS_FIN_WAIT_1; 1564 break; 1565 1566 case TCPS_CLOSE_WAIT: 1567 tp->t_state = TCPS_LAST_ACK; 1568 break; 1569 } 1570 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1571 soisdisconnected(tp->t_inpcb->inp_socket); 1572 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1573 if (tp->t_state == TCPS_FIN_WAIT_2) { 1574 int timeout; 1575 1576 timeout = (tcp_fast_finwait2_recycle) ? 1577 tcp_finwait2_timeout : tcp_maxidle; 1578 tcp_timer_activate(tp, TT_2MSL, timeout); 1579 } 1580 } 1581 } 1582 1583 #ifdef DDB 1584 static void 1585 db_print_indent(int indent) 1586 { 1587 int i; 1588 1589 for (i = 0; i < indent; i++) 1590 db_printf(" "); 1591 } 1592 1593 static void 1594 db_print_tstate(int t_state) 1595 { 1596 1597 switch (t_state) { 1598 case TCPS_CLOSED: 1599 db_printf("TCPS_CLOSED"); 1600 return; 1601 1602 case TCPS_LISTEN: 1603 db_printf("TCPS_LISTEN"); 1604 return; 1605 1606 case TCPS_SYN_SENT: 1607 db_printf("TCPS_SYN_SENT"); 1608 return; 1609 1610 case TCPS_SYN_RECEIVED: 1611 db_printf("TCPS_SYN_RECEIVED"); 1612 return; 1613 1614 case TCPS_ESTABLISHED: 1615 db_printf("TCPS_ESTABLISHED"); 1616 return; 1617 1618 case TCPS_CLOSE_WAIT: 1619 db_printf("TCPS_CLOSE_WAIT"); 1620 return; 1621 1622 case TCPS_FIN_WAIT_1: 1623 db_printf("TCPS_FIN_WAIT_1"); 1624 return; 1625 1626 case TCPS_CLOSING: 1627 db_printf("TCPS_CLOSING"); 1628 return; 1629 1630 case TCPS_LAST_ACK: 1631 db_printf("TCPS_LAST_ACK"); 1632 return; 1633 1634 case TCPS_FIN_WAIT_2: 1635 db_printf("TCPS_FIN_WAIT_2"); 1636 return; 1637 1638 case TCPS_TIME_WAIT: 1639 db_printf("TCPS_TIME_WAIT"); 1640 return; 1641 1642 default: 1643 db_printf("unknown"); 1644 return; 1645 } 1646 } 1647 1648 static void 1649 db_print_tflags(u_int t_flags) 1650 { 1651 int comma; 1652 1653 comma = 0; 1654 if (t_flags & TF_ACKNOW) { 1655 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 1656 comma = 1; 1657 } 1658 if (t_flags & TF_DELACK) { 1659 db_printf("%sTF_DELACK", comma ? ", " : ""); 1660 comma = 1; 1661 } 1662 if (t_flags & TF_NODELAY) { 1663 db_printf("%sTF_NODELAY", comma ? ", " : ""); 1664 comma = 1; 1665 } 1666 if (t_flags & TF_NOOPT) { 1667 db_printf("%sTF_NOOPT", comma ? ", " : ""); 1668 comma = 1; 1669 } 1670 if (t_flags & TF_SENTFIN) { 1671 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 1672 comma = 1; 1673 } 1674 if (t_flags & TF_REQ_SCALE) { 1675 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 1676 comma = 1; 1677 } 1678 if (t_flags & TF_RCVD_SCALE) { 1679 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 1680 comma = 1; 1681 } 1682 if (t_flags & TF_REQ_TSTMP) { 1683 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 1684 comma = 1; 1685 } 1686 if (t_flags & TF_RCVD_TSTMP) { 1687 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 1688 comma = 1; 1689 } 1690 if (t_flags & TF_SACK_PERMIT) { 1691 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 1692 comma = 1; 1693 } 1694 if (t_flags & TF_NEEDSYN) { 1695 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 1696 comma = 1; 1697 } 1698 if (t_flags & TF_NEEDFIN) { 1699 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 1700 comma = 1; 1701 } 1702 if (t_flags & TF_NOPUSH) { 1703 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1704 comma = 1; 1705 } 1706 if (t_flags & TF_NOPUSH) { 1707 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1708 comma = 1; 1709 } 1710 if (t_flags & TF_MORETOCOME) { 1711 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 1712 comma = 1; 1713 } 1714 if (t_flags & TF_LQ_OVERFLOW) { 1715 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 1716 comma = 1; 1717 } 1718 if (t_flags & TF_LASTIDLE) { 1719 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 1720 comma = 1; 1721 } 1722 if (t_flags & TF_RXWIN0SENT) { 1723 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 1724 comma = 1; 1725 } 1726 if (t_flags & TF_FASTRECOVERY) { 1727 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 1728 comma = 1; 1729 } 1730 if (t_flags & TF_WASFRECOVERY) { 1731 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 1732 comma = 1; 1733 } 1734 if (t_flags & TF_SIGNATURE) { 1735 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 1736 comma = 1; 1737 } 1738 if (t_flags & TF_FORCEDATA) { 1739 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 1740 comma = 1; 1741 } 1742 if (t_flags & TF_TSO) { 1743 db_printf("%sTF_TSO", comma ? ", " : ""); 1744 comma = 1; 1745 } 1746 if (t_flags & TF_ECN_PERMIT) { 1747 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 1748 comma = 1; 1749 } 1750 } 1751 1752 static void 1753 db_print_toobflags(char t_oobflags) 1754 { 1755 int comma; 1756 1757 comma = 0; 1758 if (t_oobflags & TCPOOB_HAVEDATA) { 1759 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 1760 comma = 1; 1761 } 1762 if (t_oobflags & TCPOOB_HADDATA) { 1763 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 1764 comma = 1; 1765 } 1766 } 1767 1768 static void 1769 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 1770 { 1771 1772 db_print_indent(indent); 1773 db_printf("%s at %p\n", name, tp); 1774 1775 indent += 2; 1776 1777 db_print_indent(indent); 1778 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 1779 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 1780 1781 db_print_indent(indent); 1782 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 1783 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 1784 1785 db_print_indent(indent); 1786 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 1787 &tp->t_timers->tt_delack, tp->t_inpcb); 1788 1789 db_print_indent(indent); 1790 db_printf("t_state: %d (", tp->t_state); 1791 db_print_tstate(tp->t_state); 1792 db_printf(")\n"); 1793 1794 db_print_indent(indent); 1795 db_printf("t_flags: 0x%x (", tp->t_flags); 1796 db_print_tflags(tp->t_flags); 1797 db_printf(")\n"); 1798 1799 db_print_indent(indent); 1800 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 1801 tp->snd_una, tp->snd_max, tp->snd_nxt); 1802 1803 db_print_indent(indent); 1804 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 1805 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 1806 1807 db_print_indent(indent); 1808 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 1809 tp->iss, tp->irs, tp->rcv_nxt); 1810 1811 db_print_indent(indent); 1812 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 1813 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 1814 1815 db_print_indent(indent); 1816 db_printf("snd_wnd: %lu snd_cwnd: %lu snd_bwnd: %lu\n", 1817 tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd); 1818 1819 db_print_indent(indent); 1820 db_printf("snd_ssthresh: %lu snd_bandwidth: %lu snd_recover: " 1821 "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth, 1822 tp->snd_recover); 1823 1824 db_print_indent(indent); 1825 db_printf("t_maxopd: %u t_rcvtime: %lu t_startime: %lu\n", 1826 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime); 1827 1828 db_print_indent(indent); 1829 db_printf("t_rttime: %d t_rtsq: 0x%08x t_bw_rtttime: %d\n", 1830 tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime); 1831 1832 db_print_indent(indent); 1833 db_printf("t_bw_rtseq: 0x%08x t_rxtcur: %d t_maxseg: %u " 1834 "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg, 1835 tp->t_srtt); 1836 1837 db_print_indent(indent); 1838 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 1839 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 1840 tp->t_rttbest); 1841 1842 db_print_indent(indent); 1843 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 1844 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 1845 1846 db_print_indent(indent); 1847 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 1848 db_print_toobflags(tp->t_oobflags); 1849 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 1850 1851 db_print_indent(indent); 1852 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 1853 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 1854 1855 db_print_indent(indent); 1856 db_printf("ts_recent: %u ts_recent_age: %lu\n", 1857 tp->ts_recent, tp->ts_recent_age); 1858 1859 db_print_indent(indent); 1860 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 1861 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 1862 1863 db_print_indent(indent); 1864 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 1865 "t_badrxtwin: %lu\n", tp->snd_ssthresh_prev, 1866 tp->snd_recover_prev, tp->t_badrxtwin); 1867 1868 db_print_indent(indent); 1869 db_printf("snd_numholes: %d snd_holes first: %p\n", 1870 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 1871 1872 db_print_indent(indent); 1873 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 1874 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 1875 1876 /* Skip sackblks, sackhint. */ 1877 1878 db_print_indent(indent); 1879 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 1880 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 1881 } 1882 1883 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 1884 { 1885 struct tcpcb *tp; 1886 1887 if (!have_addr) { 1888 db_printf("usage: show tcpcb <addr>\n"); 1889 return; 1890 } 1891 tp = (struct tcpcb *)addr; 1892 1893 db_print_tcpcb(tp, "tcpcb", 0); 1894 } 1895 #endif 1896