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/refcount.h> 51 #include <sys/kernel.h> 52 #include <sys/sysctl.h> 53 #include <sys/mbuf.h> 54 #ifdef INET6 55 #include <sys/domain.h> 56 #endif /* INET6 */ 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/protosw.h> 60 #include <sys/proc.h> 61 #include <sys/jail.h> 62 63 #ifdef DDB 64 #include <ddb/ddb.h> 65 #endif 66 67 #include <net/if.h> 68 #include <net/if_var.h> 69 #include <net/route.h> 70 #include <net/vnet.h> 71 72 #include <netinet/cc.h> 73 #include <netinet/in.h> 74 #include <netinet/in_kdtrace.h> 75 #include <netinet/in_pcb.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 #include <netinet/ip_var.h> 79 #ifdef INET6 80 #include <netinet/ip6.h> 81 #include <netinet6/in6_pcb.h> 82 #include <netinet6/ip6_var.h> 83 #include <netinet6/scope6_var.h> 84 #endif 85 #ifdef TCP_RFC7413 86 #include <netinet/tcp_fastopen.h> 87 #endif 88 #include <netinet/tcp_fsm.h> 89 #include <netinet/tcp_seq.h> 90 #include <netinet/tcp_timer.h> 91 #include <netinet/tcp_var.h> 92 #include <netinet/tcpip.h> 93 #ifdef TCPPCAP 94 #include <netinet/tcp_pcap.h> 95 #endif 96 #ifdef TCPDEBUG 97 #include <netinet/tcp_debug.h> 98 #endif 99 #ifdef TCP_OFFLOAD 100 #include <netinet/tcp_offload.h> 101 #endif 102 103 /* 104 * TCP protocol interface to socket abstraction. 105 */ 106 static int tcp_attach(struct socket *); 107 #ifdef INET 108 static int tcp_connect(struct tcpcb *, struct sockaddr *, 109 struct thread *td); 110 #endif /* INET */ 111 #ifdef INET6 112 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 113 struct thread *td); 114 #endif /* INET6 */ 115 static void tcp_disconnect(struct tcpcb *); 116 static void tcp_usrclosed(struct tcpcb *); 117 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 118 119 #ifdef TCPDEBUG 120 #define TCPDEBUG0 int ostate = 0 121 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 122 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 123 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 124 #else 125 #define TCPDEBUG0 126 #define TCPDEBUG1() 127 #define TCPDEBUG2(req) 128 #endif 129 130 /* 131 * TCP attaches to socket via pru_attach(), reserving space, 132 * and an internet control block. 133 */ 134 static int 135 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 136 { 137 struct inpcb *inp; 138 struct tcpcb *tp = NULL; 139 int error; 140 TCPDEBUG0; 141 142 inp = sotoinpcb(so); 143 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 144 TCPDEBUG1(); 145 146 error = tcp_attach(so); 147 if (error) 148 goto out; 149 150 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 151 so->so_linger = TCP_LINGERTIME; 152 153 inp = sotoinpcb(so); 154 tp = intotcpcb(inp); 155 out: 156 TCPDEBUG2(PRU_ATTACH); 157 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 158 return error; 159 } 160 161 /* 162 * tcp_detach is called when the socket layer loses its final reference 163 * to the socket, be it a file descriptor reference, a reference from TCP, 164 * etc. At this point, there is only one case in which we will keep around 165 * inpcb state: time wait. 166 * 167 * This function can probably be re-absorbed back into tcp_usr_detach() now 168 * that there is a single detach path. 169 */ 170 static void 171 tcp_detach(struct socket *so, struct inpcb *inp) 172 { 173 struct tcpcb *tp; 174 175 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 176 INP_WLOCK_ASSERT(inp); 177 178 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 179 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 180 181 tp = intotcpcb(inp); 182 183 if (inp->inp_flags & INP_TIMEWAIT) { 184 /* 185 * There are two cases to handle: one in which the time wait 186 * state is being discarded (INP_DROPPED), and one in which 187 * this connection will remain in timewait. In the former, 188 * it is time to discard all state (except tcptw, which has 189 * already been discarded by the timewait close code, which 190 * should be further up the call stack somewhere). In the 191 * latter case, we detach from the socket, but leave the pcb 192 * present until timewait ends. 193 * 194 * XXXRW: Would it be cleaner to free the tcptw here? 195 * 196 * Astute question indeed, from twtcp perspective there are 197 * three cases to consider: 198 * 199 * #1 tcp_detach is called at tcptw creation time by 200 * tcp_twstart, then do not discard the newly created tcptw 201 * and leave inpcb present until timewait ends 202 * #2 tcp_detach is called at timewait end (or reuse) by 203 * tcp_twclose, then the tcptw has already been discarded 204 * (or reused) and inpcb is freed here 205 * #3 tcp_detach is called() after timewait ends (or reuse) 206 * (e.g. by soclose), then tcptw has already been discarded 207 * (or reused) and inpcb is freed here 208 * 209 * In all three cases the tcptw should not be freed here. 210 */ 211 if (inp->inp_flags & INP_DROPPED) { 212 KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && " 213 "INP_DROPPED && tp != NULL")); 214 in_pcbdetach(inp); 215 in_pcbfree(inp); 216 } else { 217 in_pcbdetach(inp); 218 INP_WUNLOCK(inp); 219 } 220 } else { 221 /* 222 * If the connection is not in timewait, we consider two 223 * two conditions: one in which no further processing is 224 * necessary (dropped || embryonic), and one in which TCP is 225 * not yet done, but no longer requires the socket, so the 226 * pcb will persist for the time being. 227 * 228 * XXXRW: Does the second case still occur? 229 */ 230 if (inp->inp_flags & INP_DROPPED || 231 tp->t_state < TCPS_SYN_SENT) { 232 tcp_discardcb(tp); 233 in_pcbdetach(inp); 234 in_pcbfree(inp); 235 } else { 236 in_pcbdetach(inp); 237 INP_WUNLOCK(inp); 238 } 239 } 240 } 241 242 /* 243 * pru_detach() detaches the TCP protocol from the socket. 244 * If the protocol state is non-embryonic, then can't 245 * do this directly: have to initiate a pru_disconnect(), 246 * which may finish later; embryonic TCB's can just 247 * be discarded here. 248 */ 249 static void 250 tcp_usr_detach(struct socket *so) 251 { 252 struct inpcb *inp; 253 int rlock = 0; 254 255 inp = sotoinpcb(so); 256 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 257 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 258 INP_INFO_RLOCK(&V_tcbinfo); 259 rlock = 1; 260 } 261 INP_WLOCK(inp); 262 KASSERT(inp->inp_socket != NULL, 263 ("tcp_usr_detach: inp_socket == NULL")); 264 tcp_detach(so, inp); 265 if (rlock) 266 INP_INFO_RUNLOCK(&V_tcbinfo); 267 } 268 269 #ifdef INET 270 /* 271 * Give the socket an address. 272 */ 273 static int 274 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 275 { 276 int error = 0; 277 struct inpcb *inp; 278 struct tcpcb *tp = NULL; 279 struct sockaddr_in *sinp; 280 281 sinp = (struct sockaddr_in *)nam; 282 if (nam->sa_len != sizeof (*sinp)) 283 return (EINVAL); 284 /* 285 * Must check for multicast addresses and disallow binding 286 * to them. 287 */ 288 if (sinp->sin_family == AF_INET && 289 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 290 return (EAFNOSUPPORT); 291 292 TCPDEBUG0; 293 inp = sotoinpcb(so); 294 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 295 INP_WLOCK(inp); 296 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 297 error = EINVAL; 298 goto out; 299 } 300 tp = intotcpcb(inp); 301 TCPDEBUG1(); 302 INP_HASH_WLOCK(&V_tcbinfo); 303 error = in_pcbbind(inp, nam, td->td_ucred); 304 INP_HASH_WUNLOCK(&V_tcbinfo); 305 out: 306 TCPDEBUG2(PRU_BIND); 307 TCP_PROBE2(debug__user, tp, PRU_BIND); 308 INP_WUNLOCK(inp); 309 310 return (error); 311 } 312 #endif /* INET */ 313 314 #ifdef INET6 315 static int 316 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 317 { 318 int error = 0; 319 struct inpcb *inp; 320 struct tcpcb *tp = NULL; 321 struct sockaddr_in6 *sin6p; 322 323 sin6p = (struct sockaddr_in6 *)nam; 324 if (nam->sa_len != sizeof (*sin6p)) 325 return (EINVAL); 326 /* 327 * Must check for multicast addresses and disallow binding 328 * to them. 329 */ 330 if (sin6p->sin6_family == AF_INET6 && 331 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 332 return (EAFNOSUPPORT); 333 334 TCPDEBUG0; 335 inp = sotoinpcb(so); 336 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 337 INP_WLOCK(inp); 338 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 339 error = EINVAL; 340 goto out; 341 } 342 tp = intotcpcb(inp); 343 TCPDEBUG1(); 344 INP_HASH_WLOCK(&V_tcbinfo); 345 inp->inp_vflag &= ~INP_IPV4; 346 inp->inp_vflag |= INP_IPV6; 347 #ifdef INET 348 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 349 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 350 inp->inp_vflag |= INP_IPV4; 351 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 352 struct sockaddr_in sin; 353 354 in6_sin6_2_sin(&sin, sin6p); 355 inp->inp_vflag |= INP_IPV4; 356 inp->inp_vflag &= ~INP_IPV6; 357 error = in_pcbbind(inp, (struct sockaddr *)&sin, 358 td->td_ucred); 359 INP_HASH_WUNLOCK(&V_tcbinfo); 360 goto out; 361 } 362 } 363 #endif 364 error = in6_pcbbind(inp, nam, td->td_ucred); 365 INP_HASH_WUNLOCK(&V_tcbinfo); 366 out: 367 TCPDEBUG2(PRU_BIND); 368 TCP_PROBE2(debug__user, tp, PRU_BIND); 369 INP_WUNLOCK(inp); 370 return (error); 371 } 372 #endif /* INET6 */ 373 374 #ifdef INET 375 /* 376 * Prepare to accept connections. 377 */ 378 static int 379 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 380 { 381 int error = 0; 382 struct inpcb *inp; 383 struct tcpcb *tp = NULL; 384 385 TCPDEBUG0; 386 inp = sotoinpcb(so); 387 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 388 INP_WLOCK(inp); 389 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 390 error = EINVAL; 391 goto out; 392 } 393 tp = intotcpcb(inp); 394 TCPDEBUG1(); 395 SOCK_LOCK(so); 396 error = solisten_proto_check(so); 397 INP_HASH_WLOCK(&V_tcbinfo); 398 if (error == 0 && inp->inp_lport == 0) 399 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 400 INP_HASH_WUNLOCK(&V_tcbinfo); 401 if (error == 0) { 402 tcp_state_change(tp, TCPS_LISTEN); 403 solisten_proto(so, backlog); 404 #ifdef TCP_OFFLOAD 405 if ((so->so_options & SO_NO_OFFLOAD) == 0) 406 tcp_offload_listen_start(tp); 407 #endif 408 } 409 SOCK_UNLOCK(so); 410 411 #ifdef TCP_RFC7413 412 if (tp->t_flags & TF_FASTOPEN) 413 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 414 #endif 415 out: 416 TCPDEBUG2(PRU_LISTEN); 417 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 418 INP_WUNLOCK(inp); 419 return (error); 420 } 421 #endif /* INET */ 422 423 #ifdef INET6 424 static int 425 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 426 { 427 int error = 0; 428 struct inpcb *inp; 429 struct tcpcb *tp = NULL; 430 431 TCPDEBUG0; 432 inp = sotoinpcb(so); 433 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 434 INP_WLOCK(inp); 435 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 436 error = EINVAL; 437 goto out; 438 } 439 tp = intotcpcb(inp); 440 TCPDEBUG1(); 441 SOCK_LOCK(so); 442 error = solisten_proto_check(so); 443 INP_HASH_WLOCK(&V_tcbinfo); 444 if (error == 0 && inp->inp_lport == 0) { 445 inp->inp_vflag &= ~INP_IPV4; 446 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 447 inp->inp_vflag |= INP_IPV4; 448 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 449 } 450 INP_HASH_WUNLOCK(&V_tcbinfo); 451 if (error == 0) { 452 tcp_state_change(tp, TCPS_LISTEN); 453 solisten_proto(so, backlog); 454 #ifdef TCP_OFFLOAD 455 if ((so->so_options & SO_NO_OFFLOAD) == 0) 456 tcp_offload_listen_start(tp); 457 #endif 458 } 459 SOCK_UNLOCK(so); 460 461 #ifdef TCP_RFC7413 462 if (tp->t_flags & TF_FASTOPEN) 463 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 464 #endif 465 out: 466 TCPDEBUG2(PRU_LISTEN); 467 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 468 INP_WUNLOCK(inp); 469 return (error); 470 } 471 #endif /* INET6 */ 472 473 #ifdef INET 474 /* 475 * Initiate connection to peer. 476 * Create a template for use in transmissions on this connection. 477 * Enter SYN_SENT state, and mark socket as connecting. 478 * Start keep-alive timer, and seed output sequence space. 479 * Send initial segment on connection. 480 */ 481 static int 482 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 483 { 484 int error = 0; 485 struct inpcb *inp; 486 struct tcpcb *tp = NULL; 487 struct sockaddr_in *sinp; 488 489 sinp = (struct sockaddr_in *)nam; 490 if (nam->sa_len != sizeof (*sinp)) 491 return (EINVAL); 492 /* 493 * Must disallow TCP ``connections'' to multicast addresses. 494 */ 495 if (sinp->sin_family == AF_INET 496 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 497 return (EAFNOSUPPORT); 498 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 499 return (error); 500 501 TCPDEBUG0; 502 inp = sotoinpcb(so); 503 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 504 INP_WLOCK(inp); 505 if (inp->inp_flags & INP_TIMEWAIT) { 506 error = EADDRINUSE; 507 goto out; 508 } 509 if (inp->inp_flags & INP_DROPPED) { 510 error = ECONNREFUSED; 511 goto out; 512 } 513 tp = intotcpcb(inp); 514 TCPDEBUG1(); 515 if ((error = tcp_connect(tp, nam, td)) != 0) 516 goto out; 517 #ifdef TCP_OFFLOAD 518 if (registered_toedevs > 0 && 519 (so->so_options & SO_NO_OFFLOAD) == 0 && 520 (error = tcp_offload_connect(so, nam)) == 0) 521 goto out; 522 #endif 523 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 524 error = tp->t_fb->tfb_tcp_output(tp); 525 out: 526 TCPDEBUG2(PRU_CONNECT); 527 INP_WUNLOCK(inp); 528 return (error); 529 } 530 #endif /* INET */ 531 532 #ifdef INET6 533 static int 534 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 535 { 536 int error = 0; 537 struct inpcb *inp; 538 struct tcpcb *tp = NULL; 539 struct sockaddr_in6 *sin6p; 540 541 TCPDEBUG0; 542 543 sin6p = (struct sockaddr_in6 *)nam; 544 if (nam->sa_len != sizeof (*sin6p)) 545 return (EINVAL); 546 /* 547 * Must disallow TCP ``connections'' to multicast addresses. 548 */ 549 if (sin6p->sin6_family == AF_INET6 550 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 551 return (EAFNOSUPPORT); 552 553 inp = sotoinpcb(so); 554 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 555 INP_WLOCK(inp); 556 if (inp->inp_flags & INP_TIMEWAIT) { 557 error = EADDRINUSE; 558 goto out; 559 } 560 if (inp->inp_flags & INP_DROPPED) { 561 error = ECONNREFUSED; 562 goto out; 563 } 564 tp = intotcpcb(inp); 565 TCPDEBUG1(); 566 #ifdef INET 567 /* 568 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 569 * therefore probably require the hash lock, which isn't held here. 570 * Is this a significant problem? 571 */ 572 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 573 struct sockaddr_in sin; 574 575 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 576 error = EINVAL; 577 goto out; 578 } 579 580 in6_sin6_2_sin(&sin, sin6p); 581 inp->inp_vflag |= INP_IPV4; 582 inp->inp_vflag &= ~INP_IPV6; 583 if ((error = prison_remote_ip4(td->td_ucred, 584 &sin.sin_addr)) != 0) 585 goto out; 586 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 587 goto out; 588 #ifdef TCP_OFFLOAD 589 if (registered_toedevs > 0 && 590 (so->so_options & SO_NO_OFFLOAD) == 0 && 591 (error = tcp_offload_connect(so, nam)) == 0) 592 goto out; 593 #endif 594 error = tp->t_fb->tfb_tcp_output(tp); 595 goto out; 596 } 597 #endif 598 inp->inp_vflag &= ~INP_IPV4; 599 inp->inp_vflag |= INP_IPV6; 600 inp->inp_inc.inc_flags |= INC_ISIPV6; 601 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 602 goto out; 603 if ((error = tcp6_connect(tp, nam, td)) != 0) 604 goto out; 605 #ifdef TCP_OFFLOAD 606 if (registered_toedevs > 0 && 607 (so->so_options & SO_NO_OFFLOAD) == 0 && 608 (error = tcp_offload_connect(so, nam)) == 0) 609 goto out; 610 #endif 611 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 612 error = tp->t_fb->tfb_tcp_output(tp); 613 614 out: 615 TCPDEBUG2(PRU_CONNECT); 616 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 617 INP_WUNLOCK(inp); 618 return (error); 619 } 620 #endif /* INET6 */ 621 622 /* 623 * Initiate disconnect from peer. 624 * If connection never passed embryonic stage, just drop; 625 * else if don't need to let data drain, then can just drop anyways, 626 * else have to begin TCP shutdown process: mark socket disconnecting, 627 * drain unread data, state switch to reflect user close, and 628 * send segment (e.g. FIN) to peer. Socket will be really disconnected 629 * when peer sends FIN and acks ours. 630 * 631 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 632 */ 633 static int 634 tcp_usr_disconnect(struct socket *so) 635 { 636 struct inpcb *inp; 637 struct tcpcb *tp = NULL; 638 int error = 0; 639 640 TCPDEBUG0; 641 INP_INFO_RLOCK(&V_tcbinfo); 642 inp = sotoinpcb(so); 643 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 644 INP_WLOCK(inp); 645 if (inp->inp_flags & INP_TIMEWAIT) 646 goto out; 647 if (inp->inp_flags & INP_DROPPED) { 648 error = ECONNRESET; 649 goto out; 650 } 651 tp = intotcpcb(inp); 652 TCPDEBUG1(); 653 tcp_disconnect(tp); 654 out: 655 TCPDEBUG2(PRU_DISCONNECT); 656 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 657 INP_WUNLOCK(inp); 658 INP_INFO_RUNLOCK(&V_tcbinfo); 659 return (error); 660 } 661 662 #ifdef INET 663 /* 664 * Accept a connection. Essentially all the work is done at higher levels; 665 * just return the address of the peer, storing through addr. 666 */ 667 static int 668 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 669 { 670 int error = 0; 671 struct inpcb *inp = NULL; 672 struct tcpcb *tp = NULL; 673 struct in_addr addr; 674 in_port_t port = 0; 675 TCPDEBUG0; 676 677 if (so->so_state & SS_ISDISCONNECTED) 678 return (ECONNABORTED); 679 680 inp = sotoinpcb(so); 681 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 682 INP_WLOCK(inp); 683 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 684 error = ECONNABORTED; 685 goto out; 686 } 687 tp = intotcpcb(inp); 688 TCPDEBUG1(); 689 690 /* 691 * We inline in_getpeeraddr and COMMON_END here, so that we can 692 * copy the data of interest and defer the malloc until after we 693 * release the lock. 694 */ 695 port = inp->inp_fport; 696 addr = inp->inp_faddr; 697 698 out: 699 TCPDEBUG2(PRU_ACCEPT); 700 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 701 INP_WUNLOCK(inp); 702 if (error == 0) 703 *nam = in_sockaddr(port, &addr); 704 return error; 705 } 706 #endif /* INET */ 707 708 #ifdef INET6 709 static int 710 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 711 { 712 struct inpcb *inp = NULL; 713 int error = 0; 714 struct tcpcb *tp = NULL; 715 struct in_addr addr; 716 struct in6_addr addr6; 717 in_port_t port = 0; 718 int v4 = 0; 719 TCPDEBUG0; 720 721 if (so->so_state & SS_ISDISCONNECTED) 722 return (ECONNABORTED); 723 724 inp = sotoinpcb(so); 725 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 726 INP_INFO_RLOCK(&V_tcbinfo); 727 INP_WLOCK(inp); 728 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 729 error = ECONNABORTED; 730 goto out; 731 } 732 tp = intotcpcb(inp); 733 TCPDEBUG1(); 734 735 /* 736 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 737 * copy the data of interest and defer the malloc until after we 738 * release the lock. 739 */ 740 if (inp->inp_vflag & INP_IPV4) { 741 v4 = 1; 742 port = inp->inp_fport; 743 addr = inp->inp_faddr; 744 } else { 745 port = inp->inp_fport; 746 addr6 = inp->in6p_faddr; 747 } 748 749 out: 750 TCPDEBUG2(PRU_ACCEPT); 751 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 752 INP_WUNLOCK(inp); 753 INP_INFO_RUNLOCK(&V_tcbinfo); 754 if (error == 0) { 755 if (v4) 756 *nam = in6_v4mapsin6_sockaddr(port, &addr); 757 else 758 *nam = in6_sockaddr(port, &addr6); 759 } 760 return error; 761 } 762 #endif /* INET6 */ 763 764 /* 765 * Mark the connection as being incapable of further output. 766 */ 767 static int 768 tcp_usr_shutdown(struct socket *so) 769 { 770 int error = 0; 771 struct inpcb *inp; 772 struct tcpcb *tp = NULL; 773 774 TCPDEBUG0; 775 INP_INFO_RLOCK(&V_tcbinfo); 776 inp = sotoinpcb(so); 777 KASSERT(inp != NULL, ("inp == NULL")); 778 INP_WLOCK(inp); 779 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 780 error = ECONNRESET; 781 goto out; 782 } 783 tp = intotcpcb(inp); 784 TCPDEBUG1(); 785 socantsendmore(so); 786 tcp_usrclosed(tp); 787 if (!(inp->inp_flags & INP_DROPPED)) 788 error = tp->t_fb->tfb_tcp_output(tp); 789 790 out: 791 TCPDEBUG2(PRU_SHUTDOWN); 792 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 793 INP_WUNLOCK(inp); 794 INP_INFO_RUNLOCK(&V_tcbinfo); 795 796 return (error); 797 } 798 799 /* 800 * After a receive, possibly send window update to peer. 801 */ 802 static int 803 tcp_usr_rcvd(struct socket *so, int flags) 804 { 805 struct inpcb *inp; 806 struct tcpcb *tp = NULL; 807 int error = 0; 808 809 TCPDEBUG0; 810 inp = sotoinpcb(so); 811 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 812 INP_WLOCK(inp); 813 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 814 error = ECONNRESET; 815 goto out; 816 } 817 tp = intotcpcb(inp); 818 TCPDEBUG1(); 819 #ifdef TCP_RFC7413 820 /* 821 * For passively-created TFO connections, don't attempt a window 822 * update while still in SYN_RECEIVED as this may trigger an early 823 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 824 * application response data, or failing that, when the DELACK timer 825 * expires. 826 */ 827 if ((tp->t_flags & TF_FASTOPEN) && 828 (tp->t_state == TCPS_SYN_RECEIVED)) 829 goto out; 830 #endif 831 #ifdef TCP_OFFLOAD 832 if (tp->t_flags & TF_TOE) 833 tcp_offload_rcvd(tp); 834 else 835 #endif 836 tp->t_fb->tfb_tcp_output(tp); 837 838 out: 839 TCPDEBUG2(PRU_RCVD); 840 TCP_PROBE2(debug__user, tp, PRU_RCVD); 841 INP_WUNLOCK(inp); 842 return (error); 843 } 844 845 /* 846 * Do a send by putting data in output queue and updating urgent 847 * marker if URG set. Possibly send more data. Unlike the other 848 * pru_*() routines, the mbuf chains are our responsibility. We 849 * must either enqueue them or free them. The other pru_* routines 850 * generally are caller-frees. 851 */ 852 static int 853 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 854 struct sockaddr *nam, struct mbuf *control, struct thread *td) 855 { 856 int error = 0; 857 struct inpcb *inp; 858 struct tcpcb *tp = NULL; 859 #ifdef INET6 860 int isipv6; 861 #endif 862 TCPDEBUG0; 863 864 /* 865 * We require the pcbinfo lock if we will close the socket as part of 866 * this call. 867 */ 868 if (flags & PRUS_EOF) 869 INP_INFO_RLOCK(&V_tcbinfo); 870 inp = sotoinpcb(so); 871 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 872 INP_WLOCK(inp); 873 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 874 if (control) 875 m_freem(control); 876 /* 877 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 878 * for freeing memory. 879 */ 880 if (m && (flags & PRUS_NOTREADY) == 0) 881 m_freem(m); 882 error = ECONNRESET; 883 goto out; 884 } 885 #ifdef INET6 886 isipv6 = nam && nam->sa_family == AF_INET6; 887 #endif /* INET6 */ 888 tp = intotcpcb(inp); 889 TCPDEBUG1(); 890 if (control) { 891 /* TCP doesn't do control messages (rights, creds, etc) */ 892 if (control->m_len) { 893 m_freem(control); 894 if (m) 895 m_freem(m); 896 error = EINVAL; 897 goto out; 898 } 899 m_freem(control); /* empty control, just free it */ 900 } 901 if (!(flags & PRUS_OOB)) { 902 sbappendstream(&so->so_snd, m, flags); 903 if (nam && tp->t_state < TCPS_SYN_SENT) { 904 /* 905 * Do implied connect if not yet connected, 906 * initialize window to default value, and 907 * initialize maxseg/maxopd using peer's cached 908 * MSS. 909 */ 910 #ifdef INET6 911 if (isipv6) 912 error = tcp6_connect(tp, nam, td); 913 #endif /* INET6 */ 914 #if defined(INET6) && defined(INET) 915 else 916 #endif 917 #ifdef INET 918 error = tcp_connect(tp, nam, td); 919 #endif 920 if (error) 921 goto out; 922 tp->snd_wnd = TTCP_CLIENT_SND_WND; 923 tcp_mss(tp, -1); 924 } 925 if (flags & PRUS_EOF) { 926 /* 927 * Close the send side of the connection after 928 * the data is sent. 929 */ 930 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 931 socantsendmore(so); 932 tcp_usrclosed(tp); 933 } 934 if (!(inp->inp_flags & INP_DROPPED) && 935 !(flags & PRUS_NOTREADY)) { 936 if (flags & PRUS_MORETOCOME) 937 tp->t_flags |= TF_MORETOCOME; 938 error = tp->t_fb->tfb_tcp_output(tp); 939 if (flags & PRUS_MORETOCOME) 940 tp->t_flags &= ~TF_MORETOCOME; 941 } 942 } else { 943 /* 944 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 945 */ 946 SOCKBUF_LOCK(&so->so_snd); 947 if (sbspace(&so->so_snd) < -512) { 948 SOCKBUF_UNLOCK(&so->so_snd); 949 m_freem(m); 950 error = ENOBUFS; 951 goto out; 952 } 953 /* 954 * According to RFC961 (Assigned Protocols), 955 * the urgent pointer points to the last octet 956 * of urgent data. We continue, however, 957 * to consider it to indicate the first octet 958 * of data past the urgent section. 959 * Otherwise, snd_up should be one lower. 960 */ 961 sbappendstream_locked(&so->so_snd, m, flags); 962 SOCKBUF_UNLOCK(&so->so_snd); 963 if (nam && tp->t_state < TCPS_SYN_SENT) { 964 /* 965 * Do implied connect if not yet connected, 966 * initialize window to default value, and 967 * initialize maxseg/maxopd using peer's cached 968 * MSS. 969 */ 970 #ifdef INET6 971 if (isipv6) 972 error = tcp6_connect(tp, nam, td); 973 #endif /* INET6 */ 974 #if defined(INET6) && defined(INET) 975 else 976 #endif 977 #ifdef INET 978 error = tcp_connect(tp, nam, td); 979 #endif 980 if (error) 981 goto out; 982 tp->snd_wnd = TTCP_CLIENT_SND_WND; 983 tcp_mss(tp, -1); 984 } 985 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 986 if (!(flags & PRUS_NOTREADY)) { 987 tp->t_flags |= TF_FORCEDATA; 988 error = tp->t_fb->tfb_tcp_output(tp); 989 tp->t_flags &= ~TF_FORCEDATA; 990 } 991 } 992 out: 993 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 994 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 995 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 996 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 997 INP_WUNLOCK(inp); 998 if (flags & PRUS_EOF) 999 INP_INFO_RUNLOCK(&V_tcbinfo); 1000 return (error); 1001 } 1002 1003 static int 1004 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1005 { 1006 struct inpcb *inp; 1007 struct tcpcb *tp; 1008 int error; 1009 1010 inp = sotoinpcb(so); 1011 INP_WLOCK(inp); 1012 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1013 INP_WUNLOCK(inp); 1014 for (int i = 0; i < count; i++) 1015 m = m_free(m); 1016 return (ECONNRESET); 1017 } 1018 tp = intotcpcb(inp); 1019 1020 SOCKBUF_LOCK(&so->so_snd); 1021 error = sbready(&so->so_snd, m, count); 1022 SOCKBUF_UNLOCK(&so->so_snd); 1023 if (error == 0) 1024 error = tp->t_fb->tfb_tcp_output(tp); 1025 INP_WUNLOCK(inp); 1026 1027 return (error); 1028 } 1029 1030 /* 1031 * Abort the TCP. Drop the connection abruptly. 1032 */ 1033 static void 1034 tcp_usr_abort(struct socket *so) 1035 { 1036 struct inpcb *inp; 1037 struct tcpcb *tp = NULL; 1038 TCPDEBUG0; 1039 1040 inp = sotoinpcb(so); 1041 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1042 1043 INP_INFO_RLOCK(&V_tcbinfo); 1044 INP_WLOCK(inp); 1045 KASSERT(inp->inp_socket != NULL, 1046 ("tcp_usr_abort: inp_socket == NULL")); 1047 1048 /* 1049 * If we still have full TCP state, and we're not dropped, drop. 1050 */ 1051 if (!(inp->inp_flags & INP_TIMEWAIT) && 1052 !(inp->inp_flags & INP_DROPPED)) { 1053 tp = intotcpcb(inp); 1054 TCPDEBUG1(); 1055 tcp_drop(tp, ECONNABORTED); 1056 TCPDEBUG2(PRU_ABORT); 1057 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1058 } 1059 if (!(inp->inp_flags & INP_DROPPED)) { 1060 SOCK_LOCK(so); 1061 so->so_state |= SS_PROTOREF; 1062 SOCK_UNLOCK(so); 1063 inp->inp_flags |= INP_SOCKREF; 1064 } 1065 INP_WUNLOCK(inp); 1066 INP_INFO_RUNLOCK(&V_tcbinfo); 1067 } 1068 1069 /* 1070 * TCP socket is closed. Start friendly disconnect. 1071 */ 1072 static void 1073 tcp_usr_close(struct socket *so) 1074 { 1075 struct inpcb *inp; 1076 struct tcpcb *tp = NULL; 1077 TCPDEBUG0; 1078 1079 inp = sotoinpcb(so); 1080 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1081 1082 INP_INFO_RLOCK(&V_tcbinfo); 1083 INP_WLOCK(inp); 1084 KASSERT(inp->inp_socket != NULL, 1085 ("tcp_usr_close: inp_socket == NULL")); 1086 1087 /* 1088 * If we still have full TCP state, and we're not dropped, initiate 1089 * a disconnect. 1090 */ 1091 if (!(inp->inp_flags & INP_TIMEWAIT) && 1092 !(inp->inp_flags & INP_DROPPED)) { 1093 tp = intotcpcb(inp); 1094 TCPDEBUG1(); 1095 tcp_disconnect(tp); 1096 TCPDEBUG2(PRU_CLOSE); 1097 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1098 } 1099 if (!(inp->inp_flags & INP_DROPPED)) { 1100 SOCK_LOCK(so); 1101 so->so_state |= SS_PROTOREF; 1102 SOCK_UNLOCK(so); 1103 inp->inp_flags |= INP_SOCKREF; 1104 } 1105 INP_WUNLOCK(inp); 1106 INP_INFO_RUNLOCK(&V_tcbinfo); 1107 } 1108 1109 /* 1110 * Receive out-of-band data. 1111 */ 1112 static int 1113 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1114 { 1115 int error = 0; 1116 struct inpcb *inp; 1117 struct tcpcb *tp = NULL; 1118 1119 TCPDEBUG0; 1120 inp = sotoinpcb(so); 1121 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1122 INP_WLOCK(inp); 1123 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1124 error = ECONNRESET; 1125 goto out; 1126 } 1127 tp = intotcpcb(inp); 1128 TCPDEBUG1(); 1129 if ((so->so_oobmark == 0 && 1130 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1131 so->so_options & SO_OOBINLINE || 1132 tp->t_oobflags & TCPOOB_HADDATA) { 1133 error = EINVAL; 1134 goto out; 1135 } 1136 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1137 error = EWOULDBLOCK; 1138 goto out; 1139 } 1140 m->m_len = 1; 1141 *mtod(m, caddr_t) = tp->t_iobc; 1142 if ((flags & MSG_PEEK) == 0) 1143 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1144 1145 out: 1146 TCPDEBUG2(PRU_RCVOOB); 1147 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1148 INP_WUNLOCK(inp); 1149 return (error); 1150 } 1151 1152 #ifdef INET 1153 struct pr_usrreqs tcp_usrreqs = { 1154 .pru_abort = tcp_usr_abort, 1155 .pru_accept = tcp_usr_accept, 1156 .pru_attach = tcp_usr_attach, 1157 .pru_bind = tcp_usr_bind, 1158 .pru_connect = tcp_usr_connect, 1159 .pru_control = in_control, 1160 .pru_detach = tcp_usr_detach, 1161 .pru_disconnect = tcp_usr_disconnect, 1162 .pru_listen = tcp_usr_listen, 1163 .pru_peeraddr = in_getpeeraddr, 1164 .pru_rcvd = tcp_usr_rcvd, 1165 .pru_rcvoob = tcp_usr_rcvoob, 1166 .pru_send = tcp_usr_send, 1167 .pru_ready = tcp_usr_ready, 1168 .pru_shutdown = tcp_usr_shutdown, 1169 .pru_sockaddr = in_getsockaddr, 1170 .pru_sosetlabel = in_pcbsosetlabel, 1171 .pru_close = tcp_usr_close, 1172 }; 1173 #endif /* INET */ 1174 1175 #ifdef INET6 1176 struct pr_usrreqs tcp6_usrreqs = { 1177 .pru_abort = tcp_usr_abort, 1178 .pru_accept = tcp6_usr_accept, 1179 .pru_attach = tcp_usr_attach, 1180 .pru_bind = tcp6_usr_bind, 1181 .pru_connect = tcp6_usr_connect, 1182 .pru_control = in6_control, 1183 .pru_detach = tcp_usr_detach, 1184 .pru_disconnect = tcp_usr_disconnect, 1185 .pru_listen = tcp6_usr_listen, 1186 .pru_peeraddr = in6_mapped_peeraddr, 1187 .pru_rcvd = tcp_usr_rcvd, 1188 .pru_rcvoob = tcp_usr_rcvoob, 1189 .pru_send = tcp_usr_send, 1190 .pru_ready = tcp_usr_ready, 1191 .pru_shutdown = tcp_usr_shutdown, 1192 .pru_sockaddr = in6_mapped_sockaddr, 1193 .pru_sosetlabel = in_pcbsosetlabel, 1194 .pru_close = tcp_usr_close, 1195 }; 1196 #endif /* INET6 */ 1197 1198 #ifdef INET 1199 /* 1200 * Common subroutine to open a TCP connection to remote host specified 1201 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1202 * port number if needed. Call in_pcbconnect_setup to do the routing and 1203 * to choose a local host address (interface). If there is an existing 1204 * incarnation of the same connection in TIME-WAIT state and if the remote 1205 * host was sending CC options and if the connection duration was < MSL, then 1206 * truncate the previous TIME-WAIT state and proceed. 1207 * Initialize connection parameters and enter SYN-SENT state. 1208 */ 1209 static int 1210 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1211 { 1212 struct inpcb *inp = tp->t_inpcb, *oinp; 1213 struct socket *so = inp->inp_socket; 1214 struct in_addr laddr; 1215 u_short lport; 1216 int error; 1217 1218 INP_WLOCK_ASSERT(inp); 1219 INP_HASH_WLOCK(&V_tcbinfo); 1220 1221 if (inp->inp_lport == 0) { 1222 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1223 if (error) 1224 goto out; 1225 } 1226 1227 /* 1228 * Cannot simply call in_pcbconnect, because there might be an 1229 * earlier incarnation of this same connection still in 1230 * TIME_WAIT state, creating an ADDRINUSE error. 1231 */ 1232 laddr = inp->inp_laddr; 1233 lport = inp->inp_lport; 1234 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1235 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1236 if (error && oinp == NULL) 1237 goto out; 1238 if (oinp) { 1239 error = EADDRINUSE; 1240 goto out; 1241 } 1242 inp->inp_laddr = laddr; 1243 in_pcbrehash(inp); 1244 INP_HASH_WUNLOCK(&V_tcbinfo); 1245 1246 /* 1247 * Compute window scaling to request: 1248 * Scale to fit into sweet spot. See tcp_syncache.c. 1249 * XXX: This should move to tcp_output(). 1250 */ 1251 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1252 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1253 tp->request_r_scale++; 1254 1255 soisconnecting(so); 1256 TCPSTAT_INC(tcps_connattempt); 1257 tcp_state_change(tp, TCPS_SYN_SENT); 1258 tp->iss = tcp_new_isn(tp); 1259 tcp_sendseqinit(tp); 1260 1261 return 0; 1262 1263 out: 1264 INP_HASH_WUNLOCK(&V_tcbinfo); 1265 return (error); 1266 } 1267 #endif /* INET */ 1268 1269 #ifdef INET6 1270 static int 1271 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1272 { 1273 struct inpcb *inp = tp->t_inpcb; 1274 int error; 1275 1276 INP_WLOCK_ASSERT(inp); 1277 INP_HASH_WLOCK(&V_tcbinfo); 1278 1279 if (inp->inp_lport == 0) { 1280 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1281 if (error) 1282 goto out; 1283 } 1284 error = in6_pcbconnect(inp, nam, td->td_ucred); 1285 if (error != 0) 1286 goto out; 1287 INP_HASH_WUNLOCK(&V_tcbinfo); 1288 1289 /* Compute window scaling to request. */ 1290 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1291 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1292 tp->request_r_scale++; 1293 1294 soisconnecting(inp->inp_socket); 1295 TCPSTAT_INC(tcps_connattempt); 1296 tcp_state_change(tp, TCPS_SYN_SENT); 1297 tp->iss = tcp_new_isn(tp); 1298 tcp_sendseqinit(tp); 1299 1300 return 0; 1301 1302 out: 1303 INP_HASH_WUNLOCK(&V_tcbinfo); 1304 return error; 1305 } 1306 #endif /* INET6 */ 1307 1308 /* 1309 * Export TCP internal state information via a struct tcp_info, based on the 1310 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1311 * (TCP state machine, etc). We export all information using FreeBSD-native 1312 * constants -- for example, the numeric values for tcpi_state will differ 1313 * from Linux. 1314 */ 1315 static void 1316 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1317 { 1318 1319 INP_WLOCK_ASSERT(tp->t_inpcb); 1320 bzero(ti, sizeof(*ti)); 1321 1322 ti->tcpi_state = tp->t_state; 1323 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1324 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1325 if (tp->t_flags & TF_SACK_PERMIT) 1326 ti->tcpi_options |= TCPI_OPT_SACK; 1327 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1328 ti->tcpi_options |= TCPI_OPT_WSCALE; 1329 ti->tcpi_snd_wscale = tp->snd_scale; 1330 ti->tcpi_rcv_wscale = tp->rcv_scale; 1331 } 1332 1333 ti->tcpi_rto = tp->t_rxtcur * tick; 1334 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1335 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1336 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1337 1338 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1339 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1340 1341 /* 1342 * FreeBSD-specific extension fields for tcp_info. 1343 */ 1344 ti->tcpi_rcv_space = tp->rcv_wnd; 1345 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1346 ti->tcpi_snd_wnd = tp->snd_wnd; 1347 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1348 ti->tcpi_snd_nxt = tp->snd_nxt; 1349 ti->tcpi_snd_mss = tp->t_maxseg; 1350 ti->tcpi_rcv_mss = tp->t_maxseg; 1351 if (tp->t_flags & TF_TOE) 1352 ti->tcpi_options |= TCPI_OPT_TOE; 1353 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1354 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1355 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1356 } 1357 1358 /* 1359 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1360 * socket option arguments. When it re-acquires the lock after the copy, it 1361 * has to revalidate that the connection is still valid for the socket 1362 * option. 1363 */ 1364 #define INP_WLOCK_RECHECK(inp) do { \ 1365 INP_WLOCK(inp); \ 1366 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1367 INP_WUNLOCK(inp); \ 1368 return (ECONNRESET); \ 1369 } \ 1370 tp = intotcpcb(inp); \ 1371 } while(0) 1372 1373 int 1374 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1375 { 1376 int error; 1377 struct inpcb *inp; 1378 struct tcpcb *tp; 1379 struct tcp_function_block *blk; 1380 struct tcp_function_set fsn; 1381 1382 error = 0; 1383 inp = sotoinpcb(so); 1384 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1385 INP_WLOCK(inp); 1386 if (sopt->sopt_level != IPPROTO_TCP) { 1387 #ifdef INET6 1388 if (inp->inp_vflag & INP_IPV6PROTO) { 1389 INP_WUNLOCK(inp); 1390 error = ip6_ctloutput(so, sopt); 1391 } 1392 #endif /* INET6 */ 1393 #if defined(INET6) && defined(INET) 1394 else 1395 #endif 1396 #ifdef INET 1397 { 1398 INP_WUNLOCK(inp); 1399 error = ip_ctloutput(so, sopt); 1400 } 1401 #endif 1402 return (error); 1403 } 1404 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1405 INP_WUNLOCK(inp); 1406 return (ECONNRESET); 1407 } 1408 tp = intotcpcb(inp); 1409 /* 1410 * Protect the TCP option TCP_FUNCTION_BLK so 1411 * that a sub-function can *never* overwrite this. 1412 */ 1413 if ((sopt->sopt_dir == SOPT_SET) && 1414 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1415 INP_WUNLOCK(inp); 1416 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1417 sizeof fsn); 1418 if (error) 1419 return (error); 1420 INP_WLOCK_RECHECK(inp); 1421 if (tp->t_state != TCPS_CLOSED) { 1422 /* 1423 * The user has advanced the state 1424 * past the initial point, we can't 1425 * switch since we are down the road 1426 * and a new set of functions may 1427 * not be compatibile. 1428 */ 1429 INP_WUNLOCK(inp); 1430 return(EINVAL); 1431 } 1432 blk = find_and_ref_tcp_functions(&fsn); 1433 if (blk == NULL) { 1434 INP_WUNLOCK(inp); 1435 return (ENOENT); 1436 } 1437 if (tp->t_fb != blk) { 1438 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1439 refcount_release(&blk->tfb_refcnt); 1440 INP_WUNLOCK(inp); 1441 return (ENOENT); 1442 } 1443 /* 1444 * Release the old refcnt, the 1445 * lookup acquires a ref on the 1446 * new one. 1447 */ 1448 if (tp->t_fb->tfb_tcp_fb_fini) 1449 (*tp->t_fb->tfb_tcp_fb_fini)(tp); 1450 refcount_release(&tp->t_fb->tfb_refcnt); 1451 tp->t_fb = blk; 1452 if (tp->t_fb->tfb_tcp_fb_init) { 1453 (*tp->t_fb->tfb_tcp_fb_init)(tp); 1454 } 1455 } 1456 #ifdef TCP_OFFLOAD 1457 if (tp->t_flags & TF_TOE) { 1458 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1459 sopt->sopt_name); 1460 } 1461 #endif 1462 INP_WUNLOCK(inp); 1463 return (error); 1464 } else if ((sopt->sopt_dir == SOPT_GET) && 1465 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1466 strcpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name); 1467 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1468 INP_WUNLOCK(inp); 1469 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1470 return (error); 1471 } 1472 /* Pass in the INP locked, called must unlock it */ 1473 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1474 } 1475 1476 int 1477 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1478 { 1479 int error, opt, optval; 1480 u_int ui; 1481 struct tcp_info ti; 1482 struct cc_algo *algo; 1483 char buf[TCP_CA_NAME_MAX]; 1484 1485 switch (sopt->sopt_dir) { 1486 case SOPT_SET: 1487 switch (sopt->sopt_name) { 1488 #ifdef TCP_SIGNATURE 1489 case TCP_MD5SIG: 1490 INP_WUNLOCK(inp); 1491 error = sooptcopyin(sopt, &optval, sizeof optval, 1492 sizeof optval); 1493 if (error) 1494 return (error); 1495 1496 INP_WLOCK_RECHECK(inp); 1497 if (optval > 0) 1498 tp->t_flags |= TF_SIGNATURE; 1499 else 1500 tp->t_flags &= ~TF_SIGNATURE; 1501 goto unlock_and_done; 1502 #endif /* TCP_SIGNATURE */ 1503 1504 case TCP_NODELAY: 1505 case TCP_NOOPT: 1506 INP_WUNLOCK(inp); 1507 error = sooptcopyin(sopt, &optval, sizeof optval, 1508 sizeof optval); 1509 if (error) 1510 return (error); 1511 1512 INP_WLOCK_RECHECK(inp); 1513 switch (sopt->sopt_name) { 1514 case TCP_NODELAY: 1515 opt = TF_NODELAY; 1516 break; 1517 case TCP_NOOPT: 1518 opt = TF_NOOPT; 1519 break; 1520 default: 1521 opt = 0; /* dead code to fool gcc */ 1522 break; 1523 } 1524 1525 if (optval) 1526 tp->t_flags |= opt; 1527 else 1528 tp->t_flags &= ~opt; 1529 unlock_and_done: 1530 #ifdef TCP_OFFLOAD 1531 if (tp->t_flags & TF_TOE) { 1532 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1533 sopt->sopt_name); 1534 } 1535 #endif 1536 INP_WUNLOCK(inp); 1537 break; 1538 1539 case TCP_NOPUSH: 1540 INP_WUNLOCK(inp); 1541 error = sooptcopyin(sopt, &optval, sizeof optval, 1542 sizeof optval); 1543 if (error) 1544 return (error); 1545 1546 INP_WLOCK_RECHECK(inp); 1547 if (optval) 1548 tp->t_flags |= TF_NOPUSH; 1549 else if (tp->t_flags & TF_NOPUSH) { 1550 tp->t_flags &= ~TF_NOPUSH; 1551 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1552 error = tp->t_fb->tfb_tcp_output(tp); 1553 } 1554 goto unlock_and_done; 1555 1556 case TCP_MAXSEG: 1557 INP_WUNLOCK(inp); 1558 error = sooptcopyin(sopt, &optval, sizeof optval, 1559 sizeof optval); 1560 if (error) 1561 return (error); 1562 1563 INP_WLOCK_RECHECK(inp); 1564 if (optval > 0 && optval <= tp->t_maxseg && 1565 optval + 40 >= V_tcp_minmss) 1566 tp->t_maxseg = optval; 1567 else 1568 error = EINVAL; 1569 goto unlock_and_done; 1570 1571 case TCP_INFO: 1572 INP_WUNLOCK(inp); 1573 error = EINVAL; 1574 break; 1575 1576 case TCP_CONGESTION: 1577 INP_WUNLOCK(inp); 1578 bzero(buf, sizeof(buf)); 1579 error = sooptcopyin(sopt, &buf, sizeof(buf), 1); 1580 if (error) 1581 break; 1582 INP_WLOCK_RECHECK(inp); 1583 /* 1584 * Return EINVAL if we can't find the requested cc algo. 1585 */ 1586 error = EINVAL; 1587 CC_LIST_RLOCK(); 1588 STAILQ_FOREACH(algo, &cc_list, entries) { 1589 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX) 1590 == 0) { 1591 /* We've found the requested algo. */ 1592 error = 0; 1593 /* 1594 * We hold a write lock over the tcb 1595 * so it's safe to do these things 1596 * without ordering concerns. 1597 */ 1598 if (CC_ALGO(tp)->cb_destroy != NULL) 1599 CC_ALGO(tp)->cb_destroy(tp->ccv); 1600 CC_ALGO(tp) = algo; 1601 /* 1602 * If something goes pear shaped 1603 * initialising the new algo, 1604 * fall back to newreno (which 1605 * does not require initialisation). 1606 */ 1607 if (algo->cb_init != NULL) 1608 if (algo->cb_init(tp->ccv) > 0) { 1609 CC_ALGO(tp) = &newreno_cc_algo; 1610 /* 1611 * The only reason init 1612 * should fail is 1613 * because of malloc. 1614 */ 1615 error = ENOMEM; 1616 } 1617 break; /* Break the STAILQ_FOREACH. */ 1618 } 1619 } 1620 CC_LIST_RUNLOCK(); 1621 goto unlock_and_done; 1622 1623 case TCP_KEEPIDLE: 1624 case TCP_KEEPINTVL: 1625 case TCP_KEEPINIT: 1626 INP_WUNLOCK(inp); 1627 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1628 if (error) 1629 return (error); 1630 1631 if (ui > (UINT_MAX / hz)) { 1632 error = EINVAL; 1633 break; 1634 } 1635 ui *= hz; 1636 1637 INP_WLOCK_RECHECK(inp); 1638 switch (sopt->sopt_name) { 1639 case TCP_KEEPIDLE: 1640 tp->t_keepidle = ui; 1641 /* 1642 * XXX: better check current remaining 1643 * timeout and "merge" it with new value. 1644 */ 1645 if ((tp->t_state > TCPS_LISTEN) && 1646 (tp->t_state <= TCPS_CLOSING)) 1647 tcp_timer_activate(tp, TT_KEEP, 1648 TP_KEEPIDLE(tp)); 1649 break; 1650 case TCP_KEEPINTVL: 1651 tp->t_keepintvl = ui; 1652 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1653 (TP_MAXIDLE(tp) > 0)) 1654 tcp_timer_activate(tp, TT_2MSL, 1655 TP_MAXIDLE(tp)); 1656 break; 1657 case TCP_KEEPINIT: 1658 tp->t_keepinit = ui; 1659 if (tp->t_state == TCPS_SYN_RECEIVED || 1660 tp->t_state == TCPS_SYN_SENT) 1661 tcp_timer_activate(tp, TT_KEEP, 1662 TP_KEEPINIT(tp)); 1663 break; 1664 } 1665 goto unlock_and_done; 1666 1667 case TCP_KEEPCNT: 1668 INP_WUNLOCK(inp); 1669 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1670 if (error) 1671 return (error); 1672 1673 INP_WLOCK_RECHECK(inp); 1674 tp->t_keepcnt = ui; 1675 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1676 (TP_MAXIDLE(tp) > 0)) 1677 tcp_timer_activate(tp, TT_2MSL, 1678 TP_MAXIDLE(tp)); 1679 goto unlock_and_done; 1680 1681 #ifdef TCPPCAP 1682 case TCP_PCAP_OUT: 1683 case TCP_PCAP_IN: 1684 INP_WUNLOCK(inp); 1685 error = sooptcopyin(sopt, &optval, sizeof optval, 1686 sizeof optval); 1687 if (error) 1688 return (error); 1689 1690 INP_WLOCK_RECHECK(inp); 1691 if (optval >= 0) 1692 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1693 &(tp->t_outpkts) : &(tp->t_inpkts), 1694 optval); 1695 else 1696 error = EINVAL; 1697 goto unlock_and_done; 1698 #endif 1699 1700 #ifdef TCP_RFC7413 1701 case TCP_FASTOPEN: 1702 INP_WUNLOCK(inp); 1703 if (!V_tcp_fastopen_enabled) 1704 return (EPERM); 1705 1706 error = sooptcopyin(sopt, &optval, sizeof optval, 1707 sizeof optval); 1708 if (error) 1709 return (error); 1710 1711 INP_WLOCK_RECHECK(inp); 1712 if (optval) { 1713 tp->t_flags |= TF_FASTOPEN; 1714 if ((tp->t_state == TCPS_LISTEN) && 1715 (tp->t_tfo_pending == NULL)) 1716 tp->t_tfo_pending = 1717 tcp_fastopen_alloc_counter(); 1718 } else 1719 tp->t_flags &= ~TF_FASTOPEN; 1720 goto unlock_and_done; 1721 #endif 1722 1723 default: 1724 INP_WUNLOCK(inp); 1725 error = ENOPROTOOPT; 1726 break; 1727 } 1728 break; 1729 1730 case SOPT_GET: 1731 tp = intotcpcb(inp); 1732 switch (sopt->sopt_name) { 1733 #ifdef TCP_SIGNATURE 1734 case TCP_MD5SIG: 1735 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1736 INP_WUNLOCK(inp); 1737 error = sooptcopyout(sopt, &optval, sizeof optval); 1738 break; 1739 #endif 1740 1741 case TCP_NODELAY: 1742 optval = tp->t_flags & TF_NODELAY; 1743 INP_WUNLOCK(inp); 1744 error = sooptcopyout(sopt, &optval, sizeof optval); 1745 break; 1746 case TCP_MAXSEG: 1747 optval = tp->t_maxseg; 1748 INP_WUNLOCK(inp); 1749 error = sooptcopyout(sopt, &optval, sizeof optval); 1750 break; 1751 case TCP_NOOPT: 1752 optval = tp->t_flags & TF_NOOPT; 1753 INP_WUNLOCK(inp); 1754 error = sooptcopyout(sopt, &optval, sizeof optval); 1755 break; 1756 case TCP_NOPUSH: 1757 optval = tp->t_flags & TF_NOPUSH; 1758 INP_WUNLOCK(inp); 1759 error = sooptcopyout(sopt, &optval, sizeof optval); 1760 break; 1761 case TCP_INFO: 1762 tcp_fill_info(tp, &ti); 1763 INP_WUNLOCK(inp); 1764 error = sooptcopyout(sopt, &ti, sizeof ti); 1765 break; 1766 case TCP_CONGESTION: 1767 bzero(buf, sizeof(buf)); 1768 strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1769 INP_WUNLOCK(inp); 1770 error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX); 1771 break; 1772 case TCP_KEEPIDLE: 1773 case TCP_KEEPINTVL: 1774 case TCP_KEEPINIT: 1775 case TCP_KEEPCNT: 1776 switch (sopt->sopt_name) { 1777 case TCP_KEEPIDLE: 1778 ui = tp->t_keepidle / hz; 1779 break; 1780 case TCP_KEEPINTVL: 1781 ui = tp->t_keepintvl / hz; 1782 break; 1783 case TCP_KEEPINIT: 1784 ui = tp->t_keepinit / hz; 1785 break; 1786 case TCP_KEEPCNT: 1787 ui = tp->t_keepcnt; 1788 break; 1789 } 1790 INP_WUNLOCK(inp); 1791 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1792 break; 1793 #ifdef TCPPCAP 1794 case TCP_PCAP_OUT: 1795 case TCP_PCAP_IN: 1796 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1797 &(tp->t_outpkts) : &(tp->t_inpkts)); 1798 INP_WUNLOCK(inp); 1799 error = sooptcopyout(sopt, &optval, sizeof optval); 1800 break; 1801 #endif 1802 1803 #ifdef TCP_RFC7413 1804 case TCP_FASTOPEN: 1805 optval = tp->t_flags & TF_FASTOPEN; 1806 INP_WUNLOCK(inp); 1807 error = sooptcopyout(sopt, &optval, sizeof optval); 1808 break; 1809 #endif 1810 default: 1811 INP_WUNLOCK(inp); 1812 error = ENOPROTOOPT; 1813 break; 1814 } 1815 break; 1816 } 1817 return (error); 1818 } 1819 #undef INP_WLOCK_RECHECK 1820 1821 /* 1822 * Attach TCP protocol to socket, allocating 1823 * internet protocol control block, tcp control block, 1824 * bufer space, and entering LISTEN state if to accept connections. 1825 */ 1826 static int 1827 tcp_attach(struct socket *so) 1828 { 1829 struct tcpcb *tp; 1830 struct inpcb *inp; 1831 int error; 1832 1833 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1834 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1835 if (error) 1836 return (error); 1837 } 1838 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1839 so->so_snd.sb_flags |= SB_AUTOSIZE; 1840 INP_INFO_RLOCK(&V_tcbinfo); 1841 error = in_pcballoc(so, &V_tcbinfo); 1842 if (error) { 1843 INP_INFO_RUNLOCK(&V_tcbinfo); 1844 return (error); 1845 } 1846 inp = sotoinpcb(so); 1847 #ifdef INET6 1848 if (inp->inp_vflag & INP_IPV6PROTO) { 1849 inp->inp_vflag |= INP_IPV6; 1850 inp->in6p_hops = -1; /* use kernel default */ 1851 } 1852 else 1853 #endif 1854 inp->inp_vflag |= INP_IPV4; 1855 tp = tcp_newtcpcb(inp); 1856 if (tp == NULL) { 1857 in_pcbdetach(inp); 1858 in_pcbfree(inp); 1859 INP_INFO_RUNLOCK(&V_tcbinfo); 1860 return (ENOBUFS); 1861 } 1862 tp->t_state = TCPS_CLOSED; 1863 INP_WUNLOCK(inp); 1864 INP_INFO_RUNLOCK(&V_tcbinfo); 1865 return (0); 1866 } 1867 1868 /* 1869 * Initiate (or continue) disconnect. 1870 * If embryonic state, just send reset (once). 1871 * If in ``let data drain'' option and linger null, just drop. 1872 * Otherwise (hard), mark socket disconnecting and drop 1873 * current input data; switch states based on user close, and 1874 * send segment to peer (with FIN). 1875 */ 1876 static void 1877 tcp_disconnect(struct tcpcb *tp) 1878 { 1879 struct inpcb *inp = tp->t_inpcb; 1880 struct socket *so = inp->inp_socket; 1881 1882 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1883 INP_WLOCK_ASSERT(inp); 1884 1885 /* 1886 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1887 * socket is still open. 1888 */ 1889 if (tp->t_state < TCPS_ESTABLISHED) { 1890 tp = tcp_close(tp); 1891 KASSERT(tp != NULL, 1892 ("tcp_disconnect: tcp_close() returned NULL")); 1893 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1894 tp = tcp_drop(tp, 0); 1895 KASSERT(tp != NULL, 1896 ("tcp_disconnect: tcp_drop() returned NULL")); 1897 } else { 1898 soisdisconnecting(so); 1899 sbflush(&so->so_rcv); 1900 tcp_usrclosed(tp); 1901 if (!(inp->inp_flags & INP_DROPPED)) 1902 tp->t_fb->tfb_tcp_output(tp); 1903 } 1904 } 1905 1906 /* 1907 * User issued close, and wish to trail through shutdown states: 1908 * if never received SYN, just forget it. If got a SYN from peer, 1909 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1910 * If already got a FIN from peer, then almost done; go to LAST_ACK 1911 * state. In all other cases, have already sent FIN to peer (e.g. 1912 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1913 * for peer to send FIN or not respond to keep-alives, etc. 1914 * We can let the user exit from the close as soon as the FIN is acked. 1915 */ 1916 static void 1917 tcp_usrclosed(struct tcpcb *tp) 1918 { 1919 1920 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1921 INP_WLOCK_ASSERT(tp->t_inpcb); 1922 1923 switch (tp->t_state) { 1924 case TCPS_LISTEN: 1925 #ifdef TCP_OFFLOAD 1926 tcp_offload_listen_stop(tp); 1927 #endif 1928 tcp_state_change(tp, TCPS_CLOSED); 1929 /* FALLTHROUGH */ 1930 case TCPS_CLOSED: 1931 tp = tcp_close(tp); 1932 /* 1933 * tcp_close() should never return NULL here as the socket is 1934 * still open. 1935 */ 1936 KASSERT(tp != NULL, 1937 ("tcp_usrclosed: tcp_close() returned NULL")); 1938 break; 1939 1940 case TCPS_SYN_SENT: 1941 case TCPS_SYN_RECEIVED: 1942 tp->t_flags |= TF_NEEDFIN; 1943 break; 1944 1945 case TCPS_ESTABLISHED: 1946 tcp_state_change(tp, TCPS_FIN_WAIT_1); 1947 break; 1948 1949 case TCPS_CLOSE_WAIT: 1950 tcp_state_change(tp, TCPS_LAST_ACK); 1951 break; 1952 } 1953 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1954 soisdisconnected(tp->t_inpcb->inp_socket); 1955 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1956 if (tp->t_state == TCPS_FIN_WAIT_2) { 1957 int timeout; 1958 1959 timeout = (tcp_fast_finwait2_recycle) ? 1960 tcp_finwait2_timeout : TP_MAXIDLE(tp); 1961 tcp_timer_activate(tp, TT_2MSL, timeout); 1962 } 1963 } 1964 } 1965 1966 #ifdef DDB 1967 static void 1968 db_print_indent(int indent) 1969 { 1970 int i; 1971 1972 for (i = 0; i < indent; i++) 1973 db_printf(" "); 1974 } 1975 1976 static void 1977 db_print_tstate(int t_state) 1978 { 1979 1980 switch (t_state) { 1981 case TCPS_CLOSED: 1982 db_printf("TCPS_CLOSED"); 1983 return; 1984 1985 case TCPS_LISTEN: 1986 db_printf("TCPS_LISTEN"); 1987 return; 1988 1989 case TCPS_SYN_SENT: 1990 db_printf("TCPS_SYN_SENT"); 1991 return; 1992 1993 case TCPS_SYN_RECEIVED: 1994 db_printf("TCPS_SYN_RECEIVED"); 1995 return; 1996 1997 case TCPS_ESTABLISHED: 1998 db_printf("TCPS_ESTABLISHED"); 1999 return; 2000 2001 case TCPS_CLOSE_WAIT: 2002 db_printf("TCPS_CLOSE_WAIT"); 2003 return; 2004 2005 case TCPS_FIN_WAIT_1: 2006 db_printf("TCPS_FIN_WAIT_1"); 2007 return; 2008 2009 case TCPS_CLOSING: 2010 db_printf("TCPS_CLOSING"); 2011 return; 2012 2013 case TCPS_LAST_ACK: 2014 db_printf("TCPS_LAST_ACK"); 2015 return; 2016 2017 case TCPS_FIN_WAIT_2: 2018 db_printf("TCPS_FIN_WAIT_2"); 2019 return; 2020 2021 case TCPS_TIME_WAIT: 2022 db_printf("TCPS_TIME_WAIT"); 2023 return; 2024 2025 default: 2026 db_printf("unknown"); 2027 return; 2028 } 2029 } 2030 2031 static void 2032 db_print_tflags(u_int t_flags) 2033 { 2034 int comma; 2035 2036 comma = 0; 2037 if (t_flags & TF_ACKNOW) { 2038 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2039 comma = 1; 2040 } 2041 if (t_flags & TF_DELACK) { 2042 db_printf("%sTF_DELACK", comma ? ", " : ""); 2043 comma = 1; 2044 } 2045 if (t_flags & TF_NODELAY) { 2046 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2047 comma = 1; 2048 } 2049 if (t_flags & TF_NOOPT) { 2050 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2051 comma = 1; 2052 } 2053 if (t_flags & TF_SENTFIN) { 2054 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2055 comma = 1; 2056 } 2057 if (t_flags & TF_REQ_SCALE) { 2058 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2059 comma = 1; 2060 } 2061 if (t_flags & TF_RCVD_SCALE) { 2062 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2063 comma = 1; 2064 } 2065 if (t_flags & TF_REQ_TSTMP) { 2066 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2067 comma = 1; 2068 } 2069 if (t_flags & TF_RCVD_TSTMP) { 2070 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2071 comma = 1; 2072 } 2073 if (t_flags & TF_SACK_PERMIT) { 2074 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2075 comma = 1; 2076 } 2077 if (t_flags & TF_NEEDSYN) { 2078 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2079 comma = 1; 2080 } 2081 if (t_flags & TF_NEEDFIN) { 2082 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2083 comma = 1; 2084 } 2085 if (t_flags & TF_NOPUSH) { 2086 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2087 comma = 1; 2088 } 2089 if (t_flags & TF_MORETOCOME) { 2090 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2091 comma = 1; 2092 } 2093 if (t_flags & TF_LQ_OVERFLOW) { 2094 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2095 comma = 1; 2096 } 2097 if (t_flags & TF_LASTIDLE) { 2098 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2099 comma = 1; 2100 } 2101 if (t_flags & TF_RXWIN0SENT) { 2102 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2103 comma = 1; 2104 } 2105 if (t_flags & TF_FASTRECOVERY) { 2106 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2107 comma = 1; 2108 } 2109 if (t_flags & TF_CONGRECOVERY) { 2110 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2111 comma = 1; 2112 } 2113 if (t_flags & TF_WASFRECOVERY) { 2114 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2115 comma = 1; 2116 } 2117 if (t_flags & TF_SIGNATURE) { 2118 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2119 comma = 1; 2120 } 2121 if (t_flags & TF_FORCEDATA) { 2122 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2123 comma = 1; 2124 } 2125 if (t_flags & TF_TSO) { 2126 db_printf("%sTF_TSO", comma ? ", " : ""); 2127 comma = 1; 2128 } 2129 if (t_flags & TF_ECN_PERMIT) { 2130 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2131 comma = 1; 2132 } 2133 if (t_flags & TF_FASTOPEN) { 2134 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2135 comma = 1; 2136 } 2137 } 2138 2139 static void 2140 db_print_toobflags(char t_oobflags) 2141 { 2142 int comma; 2143 2144 comma = 0; 2145 if (t_oobflags & TCPOOB_HAVEDATA) { 2146 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2147 comma = 1; 2148 } 2149 if (t_oobflags & TCPOOB_HADDATA) { 2150 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2151 comma = 1; 2152 } 2153 } 2154 2155 static void 2156 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2157 { 2158 2159 db_print_indent(indent); 2160 db_printf("%s at %p\n", name, tp); 2161 2162 indent += 2; 2163 2164 db_print_indent(indent); 2165 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2166 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2167 2168 db_print_indent(indent); 2169 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2170 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2171 2172 db_print_indent(indent); 2173 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2174 &tp->t_timers->tt_delack, tp->t_inpcb); 2175 2176 db_print_indent(indent); 2177 db_printf("t_state: %d (", tp->t_state); 2178 db_print_tstate(tp->t_state); 2179 db_printf(")\n"); 2180 2181 db_print_indent(indent); 2182 db_printf("t_flags: 0x%x (", tp->t_flags); 2183 db_print_tflags(tp->t_flags); 2184 db_printf(")\n"); 2185 2186 db_print_indent(indent); 2187 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2188 tp->snd_una, tp->snd_max, tp->snd_nxt); 2189 2190 db_print_indent(indent); 2191 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2192 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2193 2194 db_print_indent(indent); 2195 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2196 tp->iss, tp->irs, tp->rcv_nxt); 2197 2198 db_print_indent(indent); 2199 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2200 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2201 2202 db_print_indent(indent); 2203 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2204 tp->snd_wnd, tp->snd_cwnd); 2205 2206 db_print_indent(indent); 2207 db_printf("snd_ssthresh: %lu snd_recover: " 2208 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2209 2210 db_print_indent(indent); 2211 db_printf("t_maxopd: %u t_rcvtime: %u t_startime: %u\n", 2212 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime); 2213 2214 db_print_indent(indent); 2215 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2216 tp->t_rtttime, tp->t_rtseq); 2217 2218 db_print_indent(indent); 2219 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2220 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2221 2222 db_print_indent(indent); 2223 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2224 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2225 tp->t_rttbest); 2226 2227 db_print_indent(indent); 2228 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2229 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2230 2231 db_print_indent(indent); 2232 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2233 db_print_toobflags(tp->t_oobflags); 2234 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2235 2236 db_print_indent(indent); 2237 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2238 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2239 2240 db_print_indent(indent); 2241 db_printf("ts_recent: %u ts_recent_age: %u\n", 2242 tp->ts_recent, tp->ts_recent_age); 2243 2244 db_print_indent(indent); 2245 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2246 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2247 2248 db_print_indent(indent); 2249 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2250 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2251 tp->snd_recover_prev, tp->t_badrxtwin); 2252 2253 db_print_indent(indent); 2254 db_printf("snd_numholes: %d snd_holes first: %p\n", 2255 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2256 2257 db_print_indent(indent); 2258 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2259 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2260 2261 /* Skip sackblks, sackhint. */ 2262 2263 db_print_indent(indent); 2264 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2265 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2266 } 2267 2268 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2269 { 2270 struct tcpcb *tp; 2271 2272 if (!have_addr) { 2273 db_printf("usage: show tcpcb <addr>\n"); 2274 return; 2275 } 2276 tp = (struct tcpcb *)addr; 2277 2278 db_print_tcpcb(tp, "tcpcb", 0); 2279 } 2280 #endif 2281