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