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 if (!(inp->inp_vflag & INP_DROPPED)) 699 error = tcp_output_disconnect(tp); 700 701 out: 702 TCPDEBUG2(PRU_SHUTDOWN); 703 INP_WUNLOCK(inp); 704 INP_INFO_WUNLOCK(&V_tcbinfo); 705 706 return (error); 707 } 708 709 /* 710 * After a receive, possibly send window update to peer. 711 */ 712 static int 713 tcp_usr_rcvd(struct socket *so, int flags) 714 { 715 struct inpcb *inp; 716 struct tcpcb *tp = NULL; 717 int error = 0; 718 719 TCPDEBUG0; 720 inp = sotoinpcb(so); 721 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 722 INP_WLOCK(inp); 723 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 724 error = ECONNRESET; 725 goto out; 726 } 727 tp = intotcpcb(inp); 728 TCPDEBUG1(); 729 tcp_output_rcvd(tp); 730 731 out: 732 TCPDEBUG2(PRU_RCVD); 733 INP_WUNLOCK(inp); 734 return (error); 735 } 736 737 /* 738 * Do a send by putting data in output queue and updating urgent 739 * marker if URG set. Possibly send more data. Unlike the other 740 * pru_*() routines, the mbuf chains are our responsibility. We 741 * must either enqueue them or free them. The other pru_* routines 742 * generally are caller-frees. 743 */ 744 static int 745 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 746 struct sockaddr *nam, struct mbuf *control, struct thread *td) 747 { 748 INIT_VNET_INET(so->so_vnet); 749 int error = 0; 750 struct inpcb *inp; 751 struct tcpcb *tp = NULL; 752 int headlocked = 0; 753 #ifdef INET6 754 int isipv6; 755 #endif 756 TCPDEBUG0; 757 758 /* 759 * We require the pcbinfo lock in two cases: 760 * 761 * (1) An implied connect is taking place, which can result in 762 * binding IPs and ports and hence modification of the pcb hash 763 * chains. 764 * 765 * (2) PRUS_EOF is set, resulting in explicit close on the send. 766 */ 767 if ((nam != NULL) || (flags & PRUS_EOF)) { 768 INP_INFO_WLOCK(&V_tcbinfo); 769 headlocked = 1; 770 } 771 inp = sotoinpcb(so); 772 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 773 INP_WLOCK(inp); 774 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 775 if (control) 776 m_freem(control); 777 if (m) 778 m_freem(m); 779 error = ECONNRESET; 780 goto out; 781 } 782 #ifdef INET6 783 isipv6 = nam && nam->sa_family == AF_INET6; 784 #endif /* INET6 */ 785 tp = intotcpcb(inp); 786 TCPDEBUG1(); 787 if (control) { 788 /* TCP doesn't do control messages (rights, creds, etc) */ 789 if (control->m_len) { 790 m_freem(control); 791 if (m) 792 m_freem(m); 793 error = EINVAL; 794 goto out; 795 } 796 m_freem(control); /* empty control, just free it */ 797 } 798 if (!(flags & PRUS_OOB)) { 799 sbappendstream(&so->so_snd, m); 800 if (nam && tp->t_state < TCPS_SYN_SENT) { 801 /* 802 * Do implied connect if not yet connected, 803 * initialize window to default value, and 804 * initialize maxseg/maxopd using peer's cached 805 * MSS. 806 */ 807 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 808 #ifdef INET6 809 if (isipv6) 810 error = tcp6_connect(tp, nam, td); 811 else 812 #endif /* INET6 */ 813 error = tcp_connect(tp, nam, td); 814 if (error) 815 goto out; 816 tp->snd_wnd = TTCP_CLIENT_SND_WND; 817 tcp_mss(tp, -1); 818 } 819 if (flags & PRUS_EOF) { 820 /* 821 * Close the send side of the connection after 822 * the data is sent. 823 */ 824 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 825 socantsendmore(so); 826 tcp_usrclosed(tp); 827 } 828 if (headlocked) { 829 INP_INFO_WUNLOCK(&V_tcbinfo); 830 headlocked = 0; 831 } 832 if (!(inp->inp_vflag & INP_DROPPED)) { 833 if (flags & PRUS_MORETOCOME) 834 tp->t_flags |= TF_MORETOCOME; 835 error = tcp_output_send(tp); 836 if (flags & PRUS_MORETOCOME) 837 tp->t_flags &= ~TF_MORETOCOME; 838 } 839 } else { 840 /* 841 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 842 */ 843 SOCKBUF_LOCK(&so->so_snd); 844 if (sbspace(&so->so_snd) < -512) { 845 SOCKBUF_UNLOCK(&so->so_snd); 846 m_freem(m); 847 error = ENOBUFS; 848 goto out; 849 } 850 /* 851 * According to RFC961 (Assigned Protocols), 852 * the urgent pointer points to the last octet 853 * of urgent data. We continue, however, 854 * to consider it to indicate the first octet 855 * of data past the urgent section. 856 * Otherwise, snd_up should be one lower. 857 */ 858 sbappendstream_locked(&so->so_snd, m); 859 SOCKBUF_UNLOCK(&so->so_snd); 860 if (nam && tp->t_state < TCPS_SYN_SENT) { 861 /* 862 * Do implied connect if not yet connected, 863 * initialize window to default value, and 864 * initialize maxseg/maxopd using peer's cached 865 * MSS. 866 */ 867 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 868 #ifdef INET6 869 if (isipv6) 870 error = tcp6_connect(tp, nam, td); 871 else 872 #endif /* INET6 */ 873 error = tcp_connect(tp, nam, td); 874 if (error) 875 goto out; 876 tp->snd_wnd = TTCP_CLIENT_SND_WND; 877 tcp_mss(tp, -1); 878 INP_INFO_WUNLOCK(&V_tcbinfo); 879 headlocked = 0; 880 } else if (nam) { 881 INP_INFO_WUNLOCK(&V_tcbinfo); 882 headlocked = 0; 883 } 884 tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 885 tp->t_flags |= TF_FORCEDATA; 886 error = tcp_output_send(tp); 887 tp->t_flags &= ~TF_FORCEDATA; 888 } 889 out: 890 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 891 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 892 INP_WUNLOCK(inp); 893 if (headlocked) 894 INP_INFO_WUNLOCK(&V_tcbinfo); 895 return (error); 896 } 897 898 /* 899 * Abort the TCP. Drop the connection abruptly. 900 */ 901 static void 902 tcp_usr_abort(struct socket *so) 903 { 904 INIT_VNET_INET(so->so_vnet); 905 struct inpcb *inp; 906 struct tcpcb *tp = NULL; 907 TCPDEBUG0; 908 909 inp = sotoinpcb(so); 910 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 911 912 INP_INFO_WLOCK(&V_tcbinfo); 913 INP_WLOCK(inp); 914 KASSERT(inp->inp_socket != NULL, 915 ("tcp_usr_abort: inp_socket == NULL")); 916 917 /* 918 * If we still have full TCP state, and we're not dropped, drop. 919 */ 920 if (!(inp->inp_vflag & INP_TIMEWAIT) && 921 !(inp->inp_vflag & INP_DROPPED)) { 922 tp = intotcpcb(inp); 923 TCPDEBUG1(); 924 tcp_drop(tp, ECONNABORTED); 925 TCPDEBUG2(PRU_ABORT); 926 } 927 if (!(inp->inp_vflag & INP_DROPPED)) { 928 SOCK_LOCK(so); 929 so->so_state |= SS_PROTOREF; 930 SOCK_UNLOCK(so); 931 inp->inp_vflag |= INP_SOCKREF; 932 } 933 INP_WUNLOCK(inp); 934 INP_INFO_WUNLOCK(&V_tcbinfo); 935 } 936 937 /* 938 * TCP socket is closed. Start friendly disconnect. 939 */ 940 static void 941 tcp_usr_close(struct socket *so) 942 { 943 INIT_VNET_INET(so->so_vnet); 944 struct inpcb *inp; 945 struct tcpcb *tp = NULL; 946 TCPDEBUG0; 947 948 inp = sotoinpcb(so); 949 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 950 951 INP_INFO_WLOCK(&V_tcbinfo); 952 INP_WLOCK(inp); 953 KASSERT(inp->inp_socket != NULL, 954 ("tcp_usr_close: inp_socket == NULL")); 955 956 /* 957 * If we still have full TCP state, and we're not dropped, initiate 958 * a disconnect. 959 */ 960 if (!(inp->inp_vflag & INP_TIMEWAIT) && 961 !(inp->inp_vflag & INP_DROPPED)) { 962 tp = intotcpcb(inp); 963 TCPDEBUG1(); 964 tcp_disconnect(tp); 965 TCPDEBUG2(PRU_CLOSE); 966 } 967 if (!(inp->inp_vflag & INP_DROPPED)) { 968 SOCK_LOCK(so); 969 so->so_state |= SS_PROTOREF; 970 SOCK_UNLOCK(so); 971 inp->inp_vflag |= INP_SOCKREF; 972 } 973 INP_WUNLOCK(inp); 974 INP_INFO_WUNLOCK(&V_tcbinfo); 975 } 976 977 /* 978 * Receive out-of-band data. 979 */ 980 static int 981 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 982 { 983 int error = 0; 984 struct inpcb *inp; 985 struct tcpcb *tp = NULL; 986 987 TCPDEBUG0; 988 inp = sotoinpcb(so); 989 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 990 INP_WLOCK(inp); 991 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 992 error = ECONNRESET; 993 goto out; 994 } 995 tp = intotcpcb(inp); 996 TCPDEBUG1(); 997 if ((so->so_oobmark == 0 && 998 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 999 so->so_options & SO_OOBINLINE || 1000 tp->t_oobflags & TCPOOB_HADDATA) { 1001 error = EINVAL; 1002 goto out; 1003 } 1004 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1005 error = EWOULDBLOCK; 1006 goto out; 1007 } 1008 m->m_len = 1; 1009 *mtod(m, caddr_t) = tp->t_iobc; 1010 if ((flags & MSG_PEEK) == 0) 1011 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1012 1013 out: 1014 TCPDEBUG2(PRU_RCVOOB); 1015 INP_WUNLOCK(inp); 1016 return (error); 1017 } 1018 1019 struct pr_usrreqs tcp_usrreqs = { 1020 .pru_abort = tcp_usr_abort, 1021 .pru_accept = tcp_usr_accept, 1022 .pru_attach = tcp_usr_attach, 1023 .pru_bind = tcp_usr_bind, 1024 .pru_connect = tcp_usr_connect, 1025 .pru_control = in_control, 1026 .pru_detach = tcp_usr_detach, 1027 .pru_disconnect = tcp_usr_disconnect, 1028 .pru_listen = tcp_usr_listen, 1029 .pru_peeraddr = in_getpeeraddr, 1030 .pru_rcvd = tcp_usr_rcvd, 1031 .pru_rcvoob = tcp_usr_rcvoob, 1032 .pru_send = tcp_usr_send, 1033 .pru_shutdown = tcp_usr_shutdown, 1034 .pru_sockaddr = in_getsockaddr, 1035 .pru_sosetlabel = in_pcbsosetlabel, 1036 .pru_close = tcp_usr_close, 1037 }; 1038 1039 #ifdef INET6 1040 struct pr_usrreqs tcp6_usrreqs = { 1041 .pru_abort = tcp_usr_abort, 1042 .pru_accept = tcp6_usr_accept, 1043 .pru_attach = tcp_usr_attach, 1044 .pru_bind = tcp6_usr_bind, 1045 .pru_connect = tcp6_usr_connect, 1046 .pru_control = in6_control, 1047 .pru_detach = tcp_usr_detach, 1048 .pru_disconnect = tcp_usr_disconnect, 1049 .pru_listen = tcp6_usr_listen, 1050 .pru_peeraddr = in6_mapped_peeraddr, 1051 .pru_rcvd = tcp_usr_rcvd, 1052 .pru_rcvoob = tcp_usr_rcvoob, 1053 .pru_send = tcp_usr_send, 1054 .pru_shutdown = tcp_usr_shutdown, 1055 .pru_sockaddr = in6_mapped_sockaddr, 1056 .pru_sosetlabel = in_pcbsosetlabel, 1057 .pru_close = tcp_usr_close, 1058 }; 1059 #endif /* INET6 */ 1060 1061 /* 1062 * Common subroutine to open a TCP connection to remote host specified 1063 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1064 * port number if needed. Call in_pcbconnect_setup to do the routing and 1065 * to choose a local host address (interface). If there is an existing 1066 * incarnation of the same connection in TIME-WAIT state and if the remote 1067 * host was sending CC options and if the connection duration was < MSL, then 1068 * truncate the previous TIME-WAIT state and proceed. 1069 * Initialize connection parameters and enter SYN-SENT state. 1070 */ 1071 static int 1072 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1073 { 1074 struct inpcb *inp = tp->t_inpcb, *oinp; 1075 struct socket *so = inp->inp_socket; 1076 INIT_VNET_INET(so->so_vnet); 1077 struct in_addr laddr; 1078 u_short lport; 1079 int error; 1080 1081 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1082 INP_WLOCK_ASSERT(inp); 1083 1084 if (inp->inp_lport == 0) { 1085 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1086 if (error) 1087 return error; 1088 } 1089 1090 /* 1091 * Cannot simply call in_pcbconnect, because there might be an 1092 * earlier incarnation of this same connection still in 1093 * TIME_WAIT state, creating an ADDRINUSE error. 1094 */ 1095 laddr = inp->inp_laddr; 1096 lport = inp->inp_lport; 1097 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1098 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1099 if (error && oinp == NULL) 1100 return error; 1101 if (oinp) 1102 return EADDRINUSE; 1103 inp->inp_laddr = laddr; 1104 in_pcbrehash(inp); 1105 1106 /* 1107 * Compute window scaling to request: 1108 * Scale to fit into sweet spot. See tcp_syncache.c. 1109 * XXX: This should move to tcp_output(). 1110 */ 1111 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1112 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1113 tp->request_r_scale++; 1114 1115 soisconnecting(so); 1116 V_tcpstat.tcps_connattempt++; 1117 tp->t_state = TCPS_SYN_SENT; 1118 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit); 1119 tp->iss = tcp_new_isn(tp); 1120 tp->t_bw_rtseq = tp->iss; 1121 tcp_sendseqinit(tp); 1122 1123 return 0; 1124 } 1125 1126 #ifdef INET6 1127 static int 1128 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1129 { 1130 struct inpcb *inp = tp->t_inpcb, *oinp; 1131 struct socket *so = inp->inp_socket; 1132 INIT_VNET_INET(so->so_vnet); 1133 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 1134 struct in6_addr *addr6; 1135 int error; 1136 1137 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1138 INP_WLOCK_ASSERT(inp); 1139 1140 if (inp->inp_lport == 0) { 1141 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1142 if (error) 1143 return error; 1144 } 1145 1146 /* 1147 * Cannot simply call in_pcbconnect, because there might be an 1148 * earlier incarnation of this same connection still in 1149 * TIME_WAIT state, creating an ADDRINUSE error. 1150 * in6_pcbladdr() also handles scope zone IDs. 1151 */ 1152 error = in6_pcbladdr(inp, nam, &addr6); 1153 if (error) 1154 return error; 1155 oinp = in6_pcblookup_hash(inp->inp_pcbinfo, 1156 &sin6->sin6_addr, sin6->sin6_port, 1157 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 1158 ? addr6 1159 : &inp->in6p_laddr, 1160 inp->inp_lport, 0, NULL); 1161 if (oinp) 1162 return EADDRINUSE; 1163 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1164 inp->in6p_laddr = *addr6; 1165 inp->in6p_faddr = sin6->sin6_addr; 1166 inp->inp_fport = sin6->sin6_port; 1167 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 1168 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 1169 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 1170 inp->inp_flow |= 1171 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 1172 in_pcbrehash(inp); 1173 1174 /* Compute window scaling to request. */ 1175 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1176 (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 1177 tp->request_r_scale++; 1178 1179 soisconnecting(so); 1180 V_tcpstat.tcps_connattempt++; 1181 tp->t_state = TCPS_SYN_SENT; 1182 tcp_timer_activate(tp, TT_KEEP, tcp_keepinit); 1183 tp->iss = tcp_new_isn(tp); 1184 tp->t_bw_rtseq = tp->iss; 1185 tcp_sendseqinit(tp); 1186 1187 return 0; 1188 } 1189 #endif /* INET6 */ 1190 1191 /* 1192 * Export TCP internal state information via a struct tcp_info, based on the 1193 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1194 * (TCP state machine, etc). We export all information using FreeBSD-native 1195 * constants -- for example, the numeric values for tcpi_state will differ 1196 * from Linux. 1197 */ 1198 static void 1199 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1200 { 1201 1202 INP_WLOCK_ASSERT(tp->t_inpcb); 1203 bzero(ti, sizeof(*ti)); 1204 1205 ti->tcpi_state = tp->t_state; 1206 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1207 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1208 if (tp->t_flags & TF_SACK_PERMIT) 1209 ti->tcpi_options |= TCPI_OPT_SACK; 1210 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1211 ti->tcpi_options |= TCPI_OPT_WSCALE; 1212 ti->tcpi_snd_wscale = tp->snd_scale; 1213 ti->tcpi_rcv_wscale = tp->rcv_scale; 1214 } 1215 1216 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1217 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1218 1219 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1220 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1221 1222 /* 1223 * FreeBSD-specific extension fields for tcp_info. 1224 */ 1225 ti->tcpi_rcv_space = tp->rcv_wnd; 1226 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1227 ti->tcpi_snd_wnd = tp->snd_wnd; 1228 ti->tcpi_snd_bwnd = tp->snd_bwnd; 1229 ti->tcpi_snd_nxt = tp->snd_nxt; 1230 ti->__tcpi_snd_mss = tp->t_maxseg; 1231 ti->__tcpi_rcv_mss = tp->t_maxseg; 1232 if (tp->t_flags & TF_TOE) 1233 ti->tcpi_options |= TCPI_OPT_TOE; 1234 } 1235 1236 /* 1237 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1238 * socket option arguments. When it re-acquires the lock after the copy, it 1239 * has to revalidate that the connection is still valid for the socket 1240 * option. 1241 */ 1242 #define INP_WLOCK_RECHECK(inp) do { \ 1243 INP_WLOCK(inp); \ 1244 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { \ 1245 INP_WUNLOCK(inp); \ 1246 return (ECONNRESET); \ 1247 } \ 1248 tp = intotcpcb(inp); \ 1249 } while(0) 1250 1251 int 1252 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1253 { 1254 INIT_VNET_INET(so->so_vnet); 1255 int error, opt, optval; 1256 struct inpcb *inp; 1257 struct tcpcb *tp; 1258 struct tcp_info ti; 1259 1260 error = 0; 1261 inp = sotoinpcb(so); 1262 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1263 INP_WLOCK(inp); 1264 if (sopt->sopt_level != IPPROTO_TCP) { 1265 #ifdef INET6 1266 if (inp->inp_vflag & INP_IPV6PROTO) { 1267 INP_WUNLOCK(inp); 1268 error = ip6_ctloutput(so, sopt); 1269 } else { 1270 #endif /* INET6 */ 1271 INP_WUNLOCK(inp); 1272 error = ip_ctloutput(so, sopt); 1273 #ifdef INET6 1274 } 1275 #endif 1276 return (error); 1277 } 1278 if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) { 1279 INP_WUNLOCK(inp); 1280 return (ECONNRESET); 1281 } 1282 1283 switch (sopt->sopt_dir) { 1284 case SOPT_SET: 1285 switch (sopt->sopt_name) { 1286 #ifdef TCP_SIGNATURE 1287 case TCP_MD5SIG: 1288 INP_WUNLOCK(inp); 1289 error = sooptcopyin(sopt, &optval, sizeof optval, 1290 sizeof optval); 1291 if (error) 1292 return (error); 1293 1294 INP_WLOCK_RECHECK(inp); 1295 if (optval > 0) 1296 tp->t_flags |= TF_SIGNATURE; 1297 else 1298 tp->t_flags &= ~TF_SIGNATURE; 1299 INP_WUNLOCK(inp); 1300 break; 1301 #endif /* TCP_SIGNATURE */ 1302 case TCP_NODELAY: 1303 case TCP_NOOPT: 1304 INP_WUNLOCK(inp); 1305 error = sooptcopyin(sopt, &optval, sizeof optval, 1306 sizeof optval); 1307 if (error) 1308 return (error); 1309 1310 INP_WLOCK_RECHECK(inp); 1311 switch (sopt->sopt_name) { 1312 case TCP_NODELAY: 1313 opt = TF_NODELAY; 1314 break; 1315 case TCP_NOOPT: 1316 opt = TF_NOOPT; 1317 break; 1318 default: 1319 opt = 0; /* dead code to fool gcc */ 1320 break; 1321 } 1322 1323 if (optval) 1324 tp->t_flags |= opt; 1325 else 1326 tp->t_flags &= ~opt; 1327 INP_WUNLOCK(inp); 1328 break; 1329 1330 case TCP_NOPUSH: 1331 INP_WUNLOCK(inp); 1332 error = sooptcopyin(sopt, &optval, sizeof optval, 1333 sizeof optval); 1334 if (error) 1335 return (error); 1336 1337 INP_WLOCK_RECHECK(inp); 1338 if (optval) 1339 tp->t_flags |= TF_NOPUSH; 1340 else { 1341 tp->t_flags &= ~TF_NOPUSH; 1342 error = tcp_output(tp); 1343 } 1344 INP_WUNLOCK(inp); 1345 break; 1346 1347 case TCP_MAXSEG: 1348 INP_WUNLOCK(inp); 1349 error = sooptcopyin(sopt, &optval, sizeof optval, 1350 sizeof optval); 1351 if (error) 1352 return (error); 1353 1354 INP_WLOCK_RECHECK(inp); 1355 if (optval > 0 && optval <= tp->t_maxseg && 1356 optval + 40 >= V_tcp_minmss) 1357 tp->t_maxseg = optval; 1358 else 1359 error = EINVAL; 1360 INP_WUNLOCK(inp); 1361 break; 1362 1363 case TCP_INFO: 1364 INP_WUNLOCK(inp); 1365 error = EINVAL; 1366 break; 1367 1368 default: 1369 INP_WUNLOCK(inp); 1370 error = ENOPROTOOPT; 1371 break; 1372 } 1373 break; 1374 1375 case SOPT_GET: 1376 tp = intotcpcb(inp); 1377 switch (sopt->sopt_name) { 1378 #ifdef TCP_SIGNATURE 1379 case TCP_MD5SIG: 1380 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1381 INP_WUNLOCK(inp); 1382 error = sooptcopyout(sopt, &optval, sizeof optval); 1383 break; 1384 #endif 1385 1386 case TCP_NODELAY: 1387 optval = tp->t_flags & TF_NODELAY; 1388 INP_WUNLOCK(inp); 1389 error = sooptcopyout(sopt, &optval, sizeof optval); 1390 break; 1391 case TCP_MAXSEG: 1392 optval = tp->t_maxseg; 1393 INP_WUNLOCK(inp); 1394 error = sooptcopyout(sopt, &optval, sizeof optval); 1395 break; 1396 case TCP_NOOPT: 1397 optval = tp->t_flags & TF_NOOPT; 1398 INP_WUNLOCK(inp); 1399 error = sooptcopyout(sopt, &optval, sizeof optval); 1400 break; 1401 case TCP_NOPUSH: 1402 optval = tp->t_flags & TF_NOPUSH; 1403 INP_WUNLOCK(inp); 1404 error = sooptcopyout(sopt, &optval, sizeof optval); 1405 break; 1406 case TCP_INFO: 1407 tcp_fill_info(tp, &ti); 1408 INP_WUNLOCK(inp); 1409 error = sooptcopyout(sopt, &ti, sizeof ti); 1410 break; 1411 default: 1412 INP_WUNLOCK(inp); 1413 error = ENOPROTOOPT; 1414 break; 1415 } 1416 break; 1417 } 1418 return (error); 1419 } 1420 #undef INP_WLOCK_RECHECK 1421 1422 /* 1423 * tcp_sendspace and tcp_recvspace are the default send and receive window 1424 * sizes, respectively. These are obsolescent (this information should 1425 * be set by the route). 1426 */ 1427 u_long tcp_sendspace = 1024*32; 1428 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1429 &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1430 u_long tcp_recvspace = 1024*64; 1431 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1432 &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1433 1434 /* 1435 * Attach TCP protocol to socket, allocating 1436 * internet protocol control block, tcp control block, 1437 * bufer space, and entering LISTEN state if to accept connections. 1438 */ 1439 static int 1440 tcp_attach(struct socket *so) 1441 { 1442 INIT_VNET_INET(so->so_vnet); 1443 struct tcpcb *tp; 1444 struct inpcb *inp; 1445 int error; 1446 1447 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1448 error = soreserve(so, tcp_sendspace, tcp_recvspace); 1449 if (error) 1450 return (error); 1451 } 1452 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1453 so->so_snd.sb_flags |= SB_AUTOSIZE; 1454 INP_INFO_WLOCK(&V_tcbinfo); 1455 error = in_pcballoc(so, &V_tcbinfo); 1456 if (error) { 1457 INP_INFO_WUNLOCK(&V_tcbinfo); 1458 return (error); 1459 } 1460 inp = sotoinpcb(so); 1461 #ifdef INET6 1462 if (inp->inp_vflag & INP_IPV6PROTO) { 1463 inp->inp_vflag |= INP_IPV6; 1464 inp->in6p_hops = -1; /* use kernel default */ 1465 } 1466 else 1467 #endif 1468 inp->inp_vflag |= INP_IPV4; 1469 tp = tcp_newtcpcb(inp); 1470 if (tp == NULL) { 1471 in_pcbdetach(inp); 1472 in_pcbfree(inp); 1473 INP_INFO_WUNLOCK(&V_tcbinfo); 1474 return (ENOBUFS); 1475 } 1476 tp->t_state = TCPS_CLOSED; 1477 INP_WUNLOCK(inp); 1478 INP_INFO_WUNLOCK(&V_tcbinfo); 1479 return (0); 1480 } 1481 1482 /* 1483 * Initiate (or continue) disconnect. 1484 * If embryonic state, just send reset (once). 1485 * If in ``let data drain'' option and linger null, just drop. 1486 * Otherwise (hard), mark socket disconnecting and drop 1487 * current input data; switch states based on user close, and 1488 * send segment to peer (with FIN). 1489 */ 1490 static void 1491 tcp_disconnect(struct tcpcb *tp) 1492 { 1493 struct inpcb *inp = tp->t_inpcb; 1494 struct socket *so = inp->inp_socket; 1495 #ifdef INVARIANTS 1496 INIT_VNET_INET(so->so_vnet); 1497 #endif 1498 1499 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1500 INP_WLOCK_ASSERT(inp); 1501 1502 /* 1503 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1504 * socket is still open. 1505 */ 1506 if (tp->t_state < TCPS_ESTABLISHED) { 1507 tp = tcp_close(tp); 1508 KASSERT(tp != NULL, 1509 ("tcp_disconnect: tcp_close() returned NULL")); 1510 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1511 tp = tcp_drop(tp, 0); 1512 KASSERT(tp != NULL, 1513 ("tcp_disconnect: tcp_drop() returned NULL")); 1514 } else { 1515 soisdisconnecting(so); 1516 sbflush(&so->so_rcv); 1517 tcp_usrclosed(tp); 1518 if (!(inp->inp_vflag & INP_DROPPED)) 1519 tcp_output_disconnect(tp); 1520 } 1521 } 1522 1523 /* 1524 * User issued close, and wish to trail through shutdown states: 1525 * if never received SYN, just forget it. If got a SYN from peer, 1526 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1527 * If already got a FIN from peer, then almost done; go to LAST_ACK 1528 * state. In all other cases, have already sent FIN to peer (e.g. 1529 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1530 * for peer to send FIN or not respond to keep-alives, etc. 1531 * We can let the user exit from the close as soon as the FIN is acked. 1532 */ 1533 static void 1534 tcp_usrclosed(struct tcpcb *tp) 1535 { 1536 #ifdef INVARIANTS 1537 INIT_VNET_INET(tp->t_inpcb->inp_vnet); 1538 #endif 1539 1540 INP_INFO_WLOCK_ASSERT(&V_tcbinfo); 1541 INP_WLOCK_ASSERT(tp->t_inpcb); 1542 1543 switch (tp->t_state) { 1544 case TCPS_LISTEN: 1545 tcp_offload_listen_close(tp); 1546 /* FALLTHROUGH */ 1547 case TCPS_CLOSED: 1548 tp->t_state = TCPS_CLOSED; 1549 tp = tcp_close(tp); 1550 /* 1551 * tcp_close() should never return NULL here as the socket is 1552 * still open. 1553 */ 1554 KASSERT(tp != NULL, 1555 ("tcp_usrclosed: tcp_close() returned NULL")); 1556 break; 1557 1558 case TCPS_SYN_SENT: 1559 case TCPS_SYN_RECEIVED: 1560 tp->t_flags |= TF_NEEDFIN; 1561 break; 1562 1563 case TCPS_ESTABLISHED: 1564 tp->t_state = TCPS_FIN_WAIT_1; 1565 break; 1566 1567 case TCPS_CLOSE_WAIT: 1568 tp->t_state = TCPS_LAST_ACK; 1569 break; 1570 } 1571 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1572 soisdisconnected(tp->t_inpcb->inp_socket); 1573 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1574 if (tp->t_state == TCPS_FIN_WAIT_2) { 1575 int timeout; 1576 1577 timeout = (tcp_fast_finwait2_recycle) ? 1578 tcp_finwait2_timeout : tcp_maxidle; 1579 tcp_timer_activate(tp, TT_2MSL, timeout); 1580 } 1581 } 1582 } 1583 1584 #ifdef DDB 1585 static void 1586 db_print_indent(int indent) 1587 { 1588 int i; 1589 1590 for (i = 0; i < indent; i++) 1591 db_printf(" "); 1592 } 1593 1594 static void 1595 db_print_tstate(int t_state) 1596 { 1597 1598 switch (t_state) { 1599 case TCPS_CLOSED: 1600 db_printf("TCPS_CLOSED"); 1601 return; 1602 1603 case TCPS_LISTEN: 1604 db_printf("TCPS_LISTEN"); 1605 return; 1606 1607 case TCPS_SYN_SENT: 1608 db_printf("TCPS_SYN_SENT"); 1609 return; 1610 1611 case TCPS_SYN_RECEIVED: 1612 db_printf("TCPS_SYN_RECEIVED"); 1613 return; 1614 1615 case TCPS_ESTABLISHED: 1616 db_printf("TCPS_ESTABLISHED"); 1617 return; 1618 1619 case TCPS_CLOSE_WAIT: 1620 db_printf("TCPS_CLOSE_WAIT"); 1621 return; 1622 1623 case TCPS_FIN_WAIT_1: 1624 db_printf("TCPS_FIN_WAIT_1"); 1625 return; 1626 1627 case TCPS_CLOSING: 1628 db_printf("TCPS_CLOSING"); 1629 return; 1630 1631 case TCPS_LAST_ACK: 1632 db_printf("TCPS_LAST_ACK"); 1633 return; 1634 1635 case TCPS_FIN_WAIT_2: 1636 db_printf("TCPS_FIN_WAIT_2"); 1637 return; 1638 1639 case TCPS_TIME_WAIT: 1640 db_printf("TCPS_TIME_WAIT"); 1641 return; 1642 1643 default: 1644 db_printf("unknown"); 1645 return; 1646 } 1647 } 1648 1649 static void 1650 db_print_tflags(u_int t_flags) 1651 { 1652 int comma; 1653 1654 comma = 0; 1655 if (t_flags & TF_ACKNOW) { 1656 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 1657 comma = 1; 1658 } 1659 if (t_flags & TF_DELACK) { 1660 db_printf("%sTF_DELACK", comma ? ", " : ""); 1661 comma = 1; 1662 } 1663 if (t_flags & TF_NODELAY) { 1664 db_printf("%sTF_NODELAY", comma ? ", " : ""); 1665 comma = 1; 1666 } 1667 if (t_flags & TF_NOOPT) { 1668 db_printf("%sTF_NOOPT", comma ? ", " : ""); 1669 comma = 1; 1670 } 1671 if (t_flags & TF_SENTFIN) { 1672 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 1673 comma = 1; 1674 } 1675 if (t_flags & TF_REQ_SCALE) { 1676 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 1677 comma = 1; 1678 } 1679 if (t_flags & TF_RCVD_SCALE) { 1680 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 1681 comma = 1; 1682 } 1683 if (t_flags & TF_REQ_TSTMP) { 1684 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 1685 comma = 1; 1686 } 1687 if (t_flags & TF_RCVD_TSTMP) { 1688 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 1689 comma = 1; 1690 } 1691 if (t_flags & TF_SACK_PERMIT) { 1692 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 1693 comma = 1; 1694 } 1695 if (t_flags & TF_NEEDSYN) { 1696 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 1697 comma = 1; 1698 } 1699 if (t_flags & TF_NEEDFIN) { 1700 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 1701 comma = 1; 1702 } 1703 if (t_flags & TF_NOPUSH) { 1704 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1705 comma = 1; 1706 } 1707 if (t_flags & TF_NOPUSH) { 1708 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1709 comma = 1; 1710 } 1711 if (t_flags & TF_MORETOCOME) { 1712 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 1713 comma = 1; 1714 } 1715 if (t_flags & TF_LQ_OVERFLOW) { 1716 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 1717 comma = 1; 1718 } 1719 if (t_flags & TF_LASTIDLE) { 1720 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 1721 comma = 1; 1722 } 1723 if (t_flags & TF_RXWIN0SENT) { 1724 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 1725 comma = 1; 1726 } 1727 if (t_flags & TF_FASTRECOVERY) { 1728 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 1729 comma = 1; 1730 } 1731 if (t_flags & TF_WASFRECOVERY) { 1732 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 1733 comma = 1; 1734 } 1735 if (t_flags & TF_SIGNATURE) { 1736 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 1737 comma = 1; 1738 } 1739 if (t_flags & TF_FORCEDATA) { 1740 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 1741 comma = 1; 1742 } 1743 if (t_flags & TF_TSO) { 1744 db_printf("%sTF_TSO", comma ? ", " : ""); 1745 comma = 1; 1746 } 1747 if (t_flags & TF_ECN_PERMIT) { 1748 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 1749 comma = 1; 1750 } 1751 } 1752 1753 static void 1754 db_print_toobflags(char t_oobflags) 1755 { 1756 int comma; 1757 1758 comma = 0; 1759 if (t_oobflags & TCPOOB_HAVEDATA) { 1760 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 1761 comma = 1; 1762 } 1763 if (t_oobflags & TCPOOB_HADDATA) { 1764 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 1765 comma = 1; 1766 } 1767 } 1768 1769 static void 1770 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 1771 { 1772 1773 db_print_indent(indent); 1774 db_printf("%s at %p\n", name, tp); 1775 1776 indent += 2; 1777 1778 db_print_indent(indent); 1779 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 1780 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 1781 1782 db_print_indent(indent); 1783 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 1784 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 1785 1786 db_print_indent(indent); 1787 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 1788 &tp->t_timers->tt_delack, tp->t_inpcb); 1789 1790 db_print_indent(indent); 1791 db_printf("t_state: %d (", tp->t_state); 1792 db_print_tstate(tp->t_state); 1793 db_printf(")\n"); 1794 1795 db_print_indent(indent); 1796 db_printf("t_flags: 0x%x (", tp->t_flags); 1797 db_print_tflags(tp->t_flags); 1798 db_printf(")\n"); 1799 1800 db_print_indent(indent); 1801 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 1802 tp->snd_una, tp->snd_max, tp->snd_nxt); 1803 1804 db_print_indent(indent); 1805 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 1806 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 1807 1808 db_print_indent(indent); 1809 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 1810 tp->iss, tp->irs, tp->rcv_nxt); 1811 1812 db_print_indent(indent); 1813 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 1814 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 1815 1816 db_print_indent(indent); 1817 db_printf("snd_wnd: %lu snd_cwnd: %lu snd_bwnd: %lu\n", 1818 tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd); 1819 1820 db_print_indent(indent); 1821 db_printf("snd_ssthresh: %lu snd_bandwidth: %lu snd_recover: " 1822 "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth, 1823 tp->snd_recover); 1824 1825 db_print_indent(indent); 1826 db_printf("t_maxopd: %u t_rcvtime: %lu t_startime: %lu\n", 1827 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime); 1828 1829 db_print_indent(indent); 1830 db_printf("t_rttime: %d t_rtsq: 0x%08x t_bw_rtttime: %d\n", 1831 tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime); 1832 1833 db_print_indent(indent); 1834 db_printf("t_bw_rtseq: 0x%08x t_rxtcur: %d t_maxseg: %u " 1835 "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg, 1836 tp->t_srtt); 1837 1838 db_print_indent(indent); 1839 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 1840 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 1841 tp->t_rttbest); 1842 1843 db_print_indent(indent); 1844 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 1845 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 1846 1847 db_print_indent(indent); 1848 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 1849 db_print_toobflags(tp->t_oobflags); 1850 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 1851 1852 db_print_indent(indent); 1853 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 1854 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 1855 1856 db_print_indent(indent); 1857 db_printf("ts_recent: %u ts_recent_age: %lu\n", 1858 tp->ts_recent, tp->ts_recent_age); 1859 1860 db_print_indent(indent); 1861 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 1862 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 1863 1864 db_print_indent(indent); 1865 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 1866 "t_badrxtwin: %lu\n", tp->snd_ssthresh_prev, 1867 tp->snd_recover_prev, tp->t_badrxtwin); 1868 1869 db_print_indent(indent); 1870 db_printf("snd_numholes: %d snd_holes first: %p\n", 1871 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 1872 1873 db_print_indent(indent); 1874 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 1875 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 1876 1877 /* Skip sackblks, sackhint. */ 1878 1879 db_print_indent(indent); 1880 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 1881 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 1882 } 1883 1884 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 1885 { 1886 struct tcpcb *tp; 1887 1888 if (!have_addr) { 1889 db_printf("usage: show tcpcb <addr>\n"); 1890 return; 1891 } 1892 tp = (struct tcpcb *)addr; 1893 1894 db_print_tcpcb(tp, "tcpcb", 0); 1895 } 1896 #endif 1897