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/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 #ifdef TCP_RFC7413 85 #include <netinet/tcp_fastopen.h> 86 #endif 87 #include <netinet/tcp.h> 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 #include <netinet/cc/cc.h> 94 #ifdef TCPPCAP 95 #include <netinet/tcp_pcap.h> 96 #endif 97 #ifdef TCPDEBUG 98 #include <netinet/tcp_debug.h> 99 #endif 100 #ifdef TCP_OFFLOAD 101 #include <netinet/tcp_offload.h> 102 #endif 103 104 /* 105 * TCP protocol interface to socket abstraction. 106 */ 107 static int tcp_attach(struct socket *); 108 #ifdef INET 109 static int tcp_connect(struct tcpcb *, struct sockaddr *, 110 struct thread *td); 111 #endif /* INET */ 112 #ifdef INET6 113 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 114 struct thread *td); 115 #endif /* INET6 */ 116 static void tcp_disconnect(struct tcpcb *); 117 static void tcp_usrclosed(struct tcpcb *); 118 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 119 120 #ifdef TCPDEBUG 121 #define TCPDEBUG0 int ostate = 0 122 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 123 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 124 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 125 #else 126 #define TCPDEBUG0 127 #define TCPDEBUG1() 128 #define TCPDEBUG2(req) 129 #endif 130 131 /* 132 * TCP attaches to socket via pru_attach(), reserving space, 133 * and an internet control block. 134 */ 135 static int 136 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 137 { 138 struct inpcb *inp; 139 struct tcpcb *tp = NULL; 140 int error; 141 TCPDEBUG0; 142 143 inp = sotoinpcb(so); 144 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 145 TCPDEBUG1(); 146 147 error = tcp_attach(so); 148 if (error) 149 goto out; 150 151 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 152 so->so_linger = TCP_LINGERTIME; 153 154 inp = sotoinpcb(so); 155 tp = intotcpcb(inp); 156 out: 157 TCPDEBUG2(PRU_ATTACH); 158 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 159 return error; 160 } 161 162 /* 163 * tcp_detach is called when the socket layer loses its final reference 164 * to the socket, be it a file descriptor reference, a reference from TCP, 165 * etc. At this point, there is only one case in which we will keep around 166 * inpcb state: time wait. 167 * 168 * This function can probably be re-absorbed back into tcp_usr_detach() now 169 * that there is a single detach path. 170 */ 171 static void 172 tcp_detach(struct socket *so, struct inpcb *inp) 173 { 174 struct tcpcb *tp; 175 176 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 177 INP_WLOCK_ASSERT(inp); 178 179 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 180 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 181 182 tp = intotcpcb(inp); 183 184 if (inp->inp_flags & INP_TIMEWAIT) { 185 /* 186 * There are two cases to handle: one in which the time wait 187 * state is being discarded (INP_DROPPED), and one in which 188 * this connection will remain in timewait. In the former, 189 * it is time to discard all state (except tcptw, which has 190 * already been discarded by the timewait close code, which 191 * should be further up the call stack somewhere). In the 192 * latter case, we detach from the socket, but leave the pcb 193 * present until timewait ends. 194 * 195 * XXXRW: Would it be cleaner to free the tcptw here? 196 * 197 * Astute question indeed, from twtcp perspective there are 198 * three cases to consider: 199 * 200 * #1 tcp_detach is called at tcptw creation time by 201 * tcp_twstart, then do not discard the newly created tcptw 202 * and leave inpcb present until timewait ends 203 * #2 tcp_detach is called at timewait end (or reuse) by 204 * tcp_twclose, then the tcptw has already been discarded 205 * (or reused) and inpcb is freed here 206 * #3 tcp_detach is called() after timewait ends (or reuse) 207 * (e.g. by soclose), then tcptw has already been discarded 208 * (or reused) and inpcb is freed here 209 * 210 * In all three cases the tcptw should not be freed here. 211 */ 212 if (inp->inp_flags & INP_DROPPED) { 213 KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && " 214 "INP_DROPPED && tp != NULL")); 215 in_pcbdetach(inp); 216 in_pcbfree(inp); 217 } else { 218 in_pcbdetach(inp); 219 INP_WUNLOCK(inp); 220 } 221 } else { 222 /* 223 * If the connection is not in timewait, we consider two 224 * two conditions: one in which no further processing is 225 * necessary (dropped || embryonic), and one in which TCP is 226 * not yet done, but no longer requires the socket, so the 227 * pcb will persist for the time being. 228 * 229 * XXXRW: Does the second case still occur? 230 */ 231 if (inp->inp_flags & INP_DROPPED || 232 tp->t_state < TCPS_SYN_SENT) { 233 tcp_discardcb(tp); 234 in_pcbdetach(inp); 235 in_pcbfree(inp); 236 } else { 237 in_pcbdetach(inp); 238 INP_WUNLOCK(inp); 239 } 240 } 241 } 242 243 /* 244 * pru_detach() detaches the TCP protocol from the socket. 245 * If the protocol state is non-embryonic, then can't 246 * do this directly: have to initiate a pru_disconnect(), 247 * which may finish later; embryonic TCB's can just 248 * be discarded here. 249 */ 250 static void 251 tcp_usr_detach(struct socket *so) 252 { 253 struct inpcb *inp; 254 int rlock = 0; 255 256 inp = sotoinpcb(so); 257 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 258 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 259 INP_INFO_RLOCK(&V_tcbinfo); 260 rlock = 1; 261 } 262 INP_WLOCK(inp); 263 KASSERT(inp->inp_socket != NULL, 264 ("tcp_usr_detach: inp_socket == NULL")); 265 tcp_detach(so, inp); 266 if (rlock) 267 INP_INFO_RUNLOCK(&V_tcbinfo); 268 } 269 270 #ifdef INET 271 /* 272 * Give the socket an address. 273 */ 274 static int 275 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 276 { 277 int error = 0; 278 struct inpcb *inp; 279 struct tcpcb *tp = NULL; 280 struct sockaddr_in *sinp; 281 282 sinp = (struct sockaddr_in *)nam; 283 if (nam->sa_len != sizeof (*sinp)) 284 return (EINVAL); 285 /* 286 * Must check for multicast addresses and disallow binding 287 * to them. 288 */ 289 if (sinp->sin_family == AF_INET && 290 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 291 return (EAFNOSUPPORT); 292 293 TCPDEBUG0; 294 inp = sotoinpcb(so); 295 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 296 INP_WLOCK(inp); 297 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 298 error = EINVAL; 299 goto out; 300 } 301 tp = intotcpcb(inp); 302 TCPDEBUG1(); 303 INP_HASH_WLOCK(&V_tcbinfo); 304 error = in_pcbbind(inp, nam, td->td_ucred); 305 INP_HASH_WUNLOCK(&V_tcbinfo); 306 out: 307 TCPDEBUG2(PRU_BIND); 308 TCP_PROBE2(debug__user, tp, PRU_BIND); 309 INP_WUNLOCK(inp); 310 311 return (error); 312 } 313 #endif /* INET */ 314 315 #ifdef INET6 316 static int 317 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 318 { 319 int error = 0; 320 struct inpcb *inp; 321 struct tcpcb *tp = NULL; 322 struct sockaddr_in6 *sin6p; 323 324 sin6p = (struct sockaddr_in6 *)nam; 325 if (nam->sa_len != sizeof (*sin6p)) 326 return (EINVAL); 327 /* 328 * Must check for multicast addresses and disallow binding 329 * to them. 330 */ 331 if (sin6p->sin6_family == AF_INET6 && 332 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 333 return (EAFNOSUPPORT); 334 335 TCPDEBUG0; 336 inp = sotoinpcb(so); 337 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 338 INP_WLOCK(inp); 339 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 340 error = EINVAL; 341 goto out; 342 } 343 tp = intotcpcb(inp); 344 TCPDEBUG1(); 345 INP_HASH_WLOCK(&V_tcbinfo); 346 inp->inp_vflag &= ~INP_IPV4; 347 inp->inp_vflag |= INP_IPV6; 348 #ifdef INET 349 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 350 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 351 inp->inp_vflag |= INP_IPV4; 352 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 353 struct sockaddr_in sin; 354 355 in6_sin6_2_sin(&sin, sin6p); 356 inp->inp_vflag |= INP_IPV4; 357 inp->inp_vflag &= ~INP_IPV6; 358 error = in_pcbbind(inp, (struct sockaddr *)&sin, 359 td->td_ucred); 360 INP_HASH_WUNLOCK(&V_tcbinfo); 361 goto out; 362 } 363 } 364 #endif 365 error = in6_pcbbind(inp, nam, td->td_ucred); 366 INP_HASH_WUNLOCK(&V_tcbinfo); 367 out: 368 TCPDEBUG2(PRU_BIND); 369 TCP_PROBE2(debug__user, tp, PRU_BIND); 370 INP_WUNLOCK(inp); 371 return (error); 372 } 373 #endif /* INET6 */ 374 375 #ifdef INET 376 /* 377 * Prepare to accept connections. 378 */ 379 static int 380 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 381 { 382 int error = 0; 383 struct inpcb *inp; 384 struct tcpcb *tp = NULL; 385 386 TCPDEBUG0; 387 inp = sotoinpcb(so); 388 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 389 INP_WLOCK(inp); 390 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 391 error = EINVAL; 392 goto out; 393 } 394 tp = intotcpcb(inp); 395 TCPDEBUG1(); 396 SOCK_LOCK(so); 397 error = solisten_proto_check(so); 398 INP_HASH_WLOCK(&V_tcbinfo); 399 if (error == 0 && inp->inp_lport == 0) 400 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 401 INP_HASH_WUNLOCK(&V_tcbinfo); 402 if (error == 0) { 403 tcp_state_change(tp, TCPS_LISTEN); 404 solisten_proto(so, backlog); 405 #ifdef TCP_OFFLOAD 406 if ((so->so_options & SO_NO_OFFLOAD) == 0) 407 tcp_offload_listen_start(tp); 408 #endif 409 } 410 SOCK_UNLOCK(so); 411 412 #ifdef TCP_RFC7413 413 if (tp->t_flags & TF_FASTOPEN) 414 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 415 #endif 416 out: 417 TCPDEBUG2(PRU_LISTEN); 418 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 419 INP_WUNLOCK(inp); 420 return (error); 421 } 422 #endif /* INET */ 423 424 #ifdef INET6 425 static int 426 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 427 { 428 int error = 0; 429 struct inpcb *inp; 430 struct tcpcb *tp = NULL; 431 432 TCPDEBUG0; 433 inp = sotoinpcb(so); 434 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 435 INP_WLOCK(inp); 436 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 437 error = EINVAL; 438 goto out; 439 } 440 tp = intotcpcb(inp); 441 TCPDEBUG1(); 442 SOCK_LOCK(so); 443 error = solisten_proto_check(so); 444 INP_HASH_WLOCK(&V_tcbinfo); 445 if (error == 0 && inp->inp_lport == 0) { 446 inp->inp_vflag &= ~INP_IPV4; 447 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 448 inp->inp_vflag |= INP_IPV4; 449 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 450 } 451 INP_HASH_WUNLOCK(&V_tcbinfo); 452 if (error == 0) { 453 tcp_state_change(tp, TCPS_LISTEN); 454 solisten_proto(so, backlog); 455 #ifdef TCP_OFFLOAD 456 if ((so->so_options & SO_NO_OFFLOAD) == 0) 457 tcp_offload_listen_start(tp); 458 #endif 459 } 460 SOCK_UNLOCK(so); 461 462 #ifdef TCP_RFC7413 463 if (tp->t_flags & TF_FASTOPEN) 464 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 465 #endif 466 out: 467 TCPDEBUG2(PRU_LISTEN); 468 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 469 INP_WUNLOCK(inp); 470 return (error); 471 } 472 #endif /* INET6 */ 473 474 #ifdef INET 475 /* 476 * Initiate connection to peer. 477 * Create a template for use in transmissions on this connection. 478 * Enter SYN_SENT state, and mark socket as connecting. 479 * Start keep-alive timer, and seed output sequence space. 480 * Send initial segment on connection. 481 */ 482 static int 483 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 484 { 485 int error = 0; 486 struct inpcb *inp; 487 struct tcpcb *tp = NULL; 488 struct sockaddr_in *sinp; 489 490 sinp = (struct sockaddr_in *)nam; 491 if (nam->sa_len != sizeof (*sinp)) 492 return (EINVAL); 493 /* 494 * Must disallow TCP ``connections'' to multicast addresses. 495 */ 496 if (sinp->sin_family == AF_INET 497 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 498 return (EAFNOSUPPORT); 499 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 500 return (error); 501 502 TCPDEBUG0; 503 inp = sotoinpcb(so); 504 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 505 INP_WLOCK(inp); 506 if (inp->inp_flags & INP_TIMEWAIT) { 507 error = EADDRINUSE; 508 goto out; 509 } 510 if (inp->inp_flags & INP_DROPPED) { 511 error = ECONNREFUSED; 512 goto out; 513 } 514 tp = intotcpcb(inp); 515 TCPDEBUG1(); 516 if ((error = tcp_connect(tp, nam, td)) != 0) 517 goto out; 518 #ifdef TCP_OFFLOAD 519 if (registered_toedevs > 0 && 520 (so->so_options & SO_NO_OFFLOAD) == 0 && 521 (error = tcp_offload_connect(so, nam)) == 0) 522 goto out; 523 #endif 524 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 525 error = tp->t_fb->tfb_tcp_output(tp); 526 out: 527 TCPDEBUG2(PRU_CONNECT); 528 INP_WUNLOCK(inp); 529 return (error); 530 } 531 #endif /* INET */ 532 533 #ifdef INET6 534 static int 535 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 536 { 537 int error = 0; 538 struct inpcb *inp; 539 struct tcpcb *tp = NULL; 540 struct sockaddr_in6 *sin6p; 541 542 TCPDEBUG0; 543 544 sin6p = (struct sockaddr_in6 *)nam; 545 if (nam->sa_len != sizeof (*sin6p)) 546 return (EINVAL); 547 /* 548 * Must disallow TCP ``connections'' to multicast addresses. 549 */ 550 if (sin6p->sin6_family == AF_INET6 551 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 552 return (EAFNOSUPPORT); 553 554 inp = sotoinpcb(so); 555 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 556 INP_WLOCK(inp); 557 if (inp->inp_flags & INP_TIMEWAIT) { 558 error = EADDRINUSE; 559 goto out; 560 } 561 if (inp->inp_flags & INP_DROPPED) { 562 error = ECONNREFUSED; 563 goto out; 564 } 565 tp = intotcpcb(inp); 566 TCPDEBUG1(); 567 #ifdef INET 568 /* 569 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 570 * therefore probably require the hash lock, which isn't held here. 571 * Is this a significant problem? 572 */ 573 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 574 struct sockaddr_in sin; 575 576 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 577 error = EINVAL; 578 goto out; 579 } 580 581 in6_sin6_2_sin(&sin, sin6p); 582 inp->inp_vflag |= INP_IPV4; 583 inp->inp_vflag &= ~INP_IPV6; 584 if ((error = prison_remote_ip4(td->td_ucred, 585 &sin.sin_addr)) != 0) 586 goto out; 587 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 588 goto out; 589 #ifdef TCP_OFFLOAD 590 if (registered_toedevs > 0 && 591 (so->so_options & SO_NO_OFFLOAD) == 0 && 592 (error = tcp_offload_connect(so, nam)) == 0) 593 goto out; 594 #endif 595 error = tp->t_fb->tfb_tcp_output(tp); 596 goto out; 597 } 598 #endif 599 inp->inp_vflag &= ~INP_IPV4; 600 inp->inp_vflag |= INP_IPV6; 601 inp->inp_inc.inc_flags |= INC_ISIPV6; 602 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 603 goto out; 604 if ((error = tcp6_connect(tp, nam, td)) != 0) 605 goto out; 606 #ifdef TCP_OFFLOAD 607 if (registered_toedevs > 0 && 608 (so->so_options & SO_NO_OFFLOAD) == 0 && 609 (error = tcp_offload_connect(so, nam)) == 0) 610 goto out; 611 #endif 612 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 613 error = tp->t_fb->tfb_tcp_output(tp); 614 615 out: 616 TCPDEBUG2(PRU_CONNECT); 617 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 618 INP_WUNLOCK(inp); 619 return (error); 620 } 621 #endif /* INET6 */ 622 623 /* 624 * Initiate disconnect from peer. 625 * If connection never passed embryonic stage, just drop; 626 * else if don't need to let data drain, then can just drop anyways, 627 * else have to begin TCP shutdown process: mark socket disconnecting, 628 * drain unread data, state switch to reflect user close, and 629 * send segment (e.g. FIN) to peer. Socket will be really disconnected 630 * when peer sends FIN and acks ours. 631 * 632 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 633 */ 634 static int 635 tcp_usr_disconnect(struct socket *so) 636 { 637 struct inpcb *inp; 638 struct tcpcb *tp = NULL; 639 int error = 0; 640 641 TCPDEBUG0; 642 INP_INFO_RLOCK(&V_tcbinfo); 643 inp = sotoinpcb(so); 644 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 645 INP_WLOCK(inp); 646 if (inp->inp_flags & INP_TIMEWAIT) 647 goto out; 648 if (inp->inp_flags & INP_DROPPED) { 649 error = ECONNRESET; 650 goto out; 651 } 652 tp = intotcpcb(inp); 653 TCPDEBUG1(); 654 tcp_disconnect(tp); 655 out: 656 TCPDEBUG2(PRU_DISCONNECT); 657 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 658 INP_WUNLOCK(inp); 659 INP_INFO_RUNLOCK(&V_tcbinfo); 660 return (error); 661 } 662 663 #ifdef INET 664 /* 665 * Accept a connection. Essentially all the work is done at higher levels; 666 * just return the address of the peer, storing through addr. 667 */ 668 static int 669 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 670 { 671 int error = 0; 672 struct inpcb *inp = NULL; 673 struct tcpcb *tp = NULL; 674 struct in_addr addr; 675 in_port_t port = 0; 676 TCPDEBUG0; 677 678 if (so->so_state & SS_ISDISCONNECTED) 679 return (ECONNABORTED); 680 681 inp = sotoinpcb(so); 682 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 683 INP_WLOCK(inp); 684 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 685 error = ECONNABORTED; 686 goto out; 687 } 688 tp = intotcpcb(inp); 689 TCPDEBUG1(); 690 691 /* 692 * We inline in_getpeeraddr and COMMON_END here, so that we can 693 * copy the data of interest and defer the malloc until after we 694 * release the lock. 695 */ 696 port = inp->inp_fport; 697 addr = inp->inp_faddr; 698 699 out: 700 TCPDEBUG2(PRU_ACCEPT); 701 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 702 INP_WUNLOCK(inp); 703 if (error == 0) 704 *nam = in_sockaddr(port, &addr); 705 return error; 706 } 707 #endif /* INET */ 708 709 #ifdef INET6 710 static int 711 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 712 { 713 struct inpcb *inp = NULL; 714 int error = 0; 715 struct tcpcb *tp = NULL; 716 struct in_addr addr; 717 struct in6_addr addr6; 718 in_port_t port = 0; 719 int v4 = 0; 720 TCPDEBUG0; 721 722 if (so->so_state & SS_ISDISCONNECTED) 723 return (ECONNABORTED); 724 725 inp = sotoinpcb(so); 726 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 727 INP_INFO_RLOCK(&V_tcbinfo); 728 INP_WLOCK(inp); 729 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 730 error = ECONNABORTED; 731 goto out; 732 } 733 tp = intotcpcb(inp); 734 TCPDEBUG1(); 735 736 /* 737 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 738 * copy the data of interest and defer the malloc until after we 739 * release the lock. 740 */ 741 if (inp->inp_vflag & INP_IPV4) { 742 v4 = 1; 743 port = inp->inp_fport; 744 addr = inp->inp_faddr; 745 } else { 746 port = inp->inp_fport; 747 addr6 = inp->in6p_faddr; 748 } 749 750 out: 751 TCPDEBUG2(PRU_ACCEPT); 752 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 753 INP_WUNLOCK(inp); 754 INP_INFO_RUNLOCK(&V_tcbinfo); 755 if (error == 0) { 756 if (v4) 757 *nam = in6_v4mapsin6_sockaddr(port, &addr); 758 else 759 *nam = in6_sockaddr(port, &addr6); 760 } 761 return error; 762 } 763 #endif /* INET6 */ 764 765 /* 766 * Mark the connection as being incapable of further output. 767 */ 768 static int 769 tcp_usr_shutdown(struct socket *so) 770 { 771 int error = 0; 772 struct inpcb *inp; 773 struct tcpcb *tp = NULL; 774 775 TCPDEBUG0; 776 INP_INFO_RLOCK(&V_tcbinfo); 777 inp = sotoinpcb(so); 778 KASSERT(inp != NULL, ("inp == NULL")); 779 INP_WLOCK(inp); 780 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 781 error = ECONNRESET; 782 goto out; 783 } 784 tp = intotcpcb(inp); 785 TCPDEBUG1(); 786 socantsendmore(so); 787 tcp_usrclosed(tp); 788 if (!(inp->inp_flags & INP_DROPPED)) 789 error = tp->t_fb->tfb_tcp_output(tp); 790 791 out: 792 TCPDEBUG2(PRU_SHUTDOWN); 793 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 794 INP_WUNLOCK(inp); 795 INP_INFO_RUNLOCK(&V_tcbinfo); 796 797 return (error); 798 } 799 800 /* 801 * After a receive, possibly send window update to peer. 802 */ 803 static int 804 tcp_usr_rcvd(struct socket *so, int flags) 805 { 806 struct inpcb *inp; 807 struct tcpcb *tp = NULL; 808 int error = 0; 809 810 TCPDEBUG0; 811 inp = sotoinpcb(so); 812 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 813 INP_WLOCK(inp); 814 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 815 error = ECONNRESET; 816 goto out; 817 } 818 tp = intotcpcb(inp); 819 TCPDEBUG1(); 820 #ifdef TCP_RFC7413 821 /* 822 * For passively-created TFO connections, don't attempt a window 823 * update while still in SYN_RECEIVED as this may trigger an early 824 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 825 * application response data, or failing that, when the DELACK timer 826 * expires. 827 */ 828 if ((tp->t_flags & TF_FASTOPEN) && 829 (tp->t_state == TCPS_SYN_RECEIVED)) 830 goto out; 831 #endif 832 #ifdef TCP_OFFLOAD 833 if (tp->t_flags & TF_TOE) 834 tcp_offload_rcvd(tp); 835 else 836 #endif 837 tp->t_fb->tfb_tcp_output(tp); 838 839 out: 840 TCPDEBUG2(PRU_RCVD); 841 TCP_PROBE2(debug__user, tp, PRU_RCVD); 842 INP_WUNLOCK(inp); 843 return (error); 844 } 845 846 /* 847 * Do a send by putting data in output queue and updating urgent 848 * marker if URG set. Possibly send more data. Unlike the other 849 * pru_*() routines, the mbuf chains are our responsibility. We 850 * must either enqueue them or free them. The other pru_* routines 851 * generally are caller-frees. 852 */ 853 static int 854 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 855 struct sockaddr *nam, struct mbuf *control, struct thread *td) 856 { 857 int error = 0; 858 struct inpcb *inp; 859 struct tcpcb *tp = NULL; 860 #ifdef INET6 861 int isipv6; 862 #endif 863 TCPDEBUG0; 864 865 /* 866 * We require the pcbinfo lock if we will close the socket as part of 867 * this call. 868 */ 869 if (flags & PRUS_EOF) 870 INP_INFO_RLOCK(&V_tcbinfo); 871 inp = sotoinpcb(so); 872 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 873 INP_WLOCK(inp); 874 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 875 if (control) 876 m_freem(control); 877 /* 878 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 879 * for freeing memory. 880 */ 881 if (m && (flags & PRUS_NOTREADY) == 0) 882 m_freem(m); 883 error = ECONNRESET; 884 goto out; 885 } 886 #ifdef INET6 887 isipv6 = nam && nam->sa_family == AF_INET6; 888 #endif /* INET6 */ 889 tp = intotcpcb(inp); 890 TCPDEBUG1(); 891 if (control) { 892 /* TCP doesn't do control messages (rights, creds, etc) */ 893 if (control->m_len) { 894 m_freem(control); 895 if (m) 896 m_freem(m); 897 error = EINVAL; 898 goto out; 899 } 900 m_freem(control); /* empty control, just free it */ 901 } 902 if (!(flags & PRUS_OOB)) { 903 sbappendstream(&so->so_snd, m, flags); 904 if (nam && tp->t_state < TCPS_SYN_SENT) { 905 /* 906 * Do implied connect if not yet connected, 907 * initialize window to default value, and 908 * initialize maxseg using peer's cached 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 using peer's cached MSS. 968 */ 969 #ifdef INET6 970 if (isipv6) 971 error = tcp6_connect(tp, nam, td); 972 #endif /* INET6 */ 973 #if defined(INET6) && defined(INET) 974 else 975 #endif 976 #ifdef INET 977 error = tcp_connect(tp, nam, td); 978 #endif 979 if (error) 980 goto out; 981 tp->snd_wnd = TTCP_CLIENT_SND_WND; 982 tcp_mss(tp, -1); 983 } 984 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 985 if (!(flags & PRUS_NOTREADY)) { 986 tp->t_flags |= TF_FORCEDATA; 987 error = tp->t_fb->tfb_tcp_output(tp); 988 tp->t_flags &= ~TF_FORCEDATA; 989 } 990 } 991 out: 992 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 993 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 994 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 995 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 996 INP_WUNLOCK(inp); 997 if (flags & PRUS_EOF) 998 INP_INFO_RUNLOCK(&V_tcbinfo); 999 return (error); 1000 } 1001 1002 static int 1003 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1004 { 1005 struct inpcb *inp; 1006 struct tcpcb *tp; 1007 int error; 1008 1009 inp = sotoinpcb(so); 1010 INP_WLOCK(inp); 1011 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1012 INP_WUNLOCK(inp); 1013 for (int i = 0; i < count; i++) 1014 m = m_free(m); 1015 return (ECONNRESET); 1016 } 1017 tp = intotcpcb(inp); 1018 1019 SOCKBUF_LOCK(&so->so_snd); 1020 error = sbready(&so->so_snd, m, count); 1021 SOCKBUF_UNLOCK(&so->so_snd); 1022 if (error == 0) 1023 error = tp->t_fb->tfb_tcp_output(tp); 1024 INP_WUNLOCK(inp); 1025 1026 return (error); 1027 } 1028 1029 /* 1030 * Abort the TCP. Drop the connection abruptly. 1031 */ 1032 static void 1033 tcp_usr_abort(struct socket *so) 1034 { 1035 struct inpcb *inp; 1036 struct tcpcb *tp = NULL; 1037 TCPDEBUG0; 1038 1039 inp = sotoinpcb(so); 1040 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1041 1042 INP_INFO_RLOCK(&V_tcbinfo); 1043 INP_WLOCK(inp); 1044 KASSERT(inp->inp_socket != NULL, 1045 ("tcp_usr_abort: inp_socket == NULL")); 1046 1047 /* 1048 * If we still have full TCP state, and we're not dropped, drop. 1049 */ 1050 if (!(inp->inp_flags & INP_TIMEWAIT) && 1051 !(inp->inp_flags & INP_DROPPED)) { 1052 tp = intotcpcb(inp); 1053 TCPDEBUG1(); 1054 tcp_drop(tp, ECONNABORTED); 1055 TCPDEBUG2(PRU_ABORT); 1056 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1057 } 1058 if (!(inp->inp_flags & INP_DROPPED)) { 1059 SOCK_LOCK(so); 1060 so->so_state |= SS_PROTOREF; 1061 SOCK_UNLOCK(so); 1062 inp->inp_flags |= INP_SOCKREF; 1063 } 1064 INP_WUNLOCK(inp); 1065 INP_INFO_RUNLOCK(&V_tcbinfo); 1066 } 1067 1068 /* 1069 * TCP socket is closed. Start friendly disconnect. 1070 */ 1071 static void 1072 tcp_usr_close(struct socket *so) 1073 { 1074 struct inpcb *inp; 1075 struct tcpcb *tp = NULL; 1076 TCPDEBUG0; 1077 1078 inp = sotoinpcb(so); 1079 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1080 1081 INP_INFO_RLOCK(&V_tcbinfo); 1082 INP_WLOCK(inp); 1083 KASSERT(inp->inp_socket != NULL, 1084 ("tcp_usr_close: inp_socket == NULL")); 1085 1086 /* 1087 * If we still have full TCP state, and we're not dropped, initiate 1088 * a disconnect. 1089 */ 1090 if (!(inp->inp_flags & INP_TIMEWAIT) && 1091 !(inp->inp_flags & INP_DROPPED)) { 1092 tp = intotcpcb(inp); 1093 TCPDEBUG1(); 1094 tcp_disconnect(tp); 1095 TCPDEBUG2(PRU_CLOSE); 1096 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1097 } 1098 if (!(inp->inp_flags & INP_DROPPED)) { 1099 SOCK_LOCK(so); 1100 so->so_state |= SS_PROTOREF; 1101 SOCK_UNLOCK(so); 1102 inp->inp_flags |= INP_SOCKREF; 1103 } 1104 INP_WUNLOCK(inp); 1105 INP_INFO_RUNLOCK(&V_tcbinfo); 1106 } 1107 1108 /* 1109 * Receive out-of-band data. 1110 */ 1111 static int 1112 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1113 { 1114 int error = 0; 1115 struct inpcb *inp; 1116 struct tcpcb *tp = NULL; 1117 1118 TCPDEBUG0; 1119 inp = sotoinpcb(so); 1120 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1121 INP_WLOCK(inp); 1122 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1123 error = ECONNRESET; 1124 goto out; 1125 } 1126 tp = intotcpcb(inp); 1127 TCPDEBUG1(); 1128 if ((so->so_oobmark == 0 && 1129 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1130 so->so_options & SO_OOBINLINE || 1131 tp->t_oobflags & TCPOOB_HADDATA) { 1132 error = EINVAL; 1133 goto out; 1134 } 1135 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1136 error = EWOULDBLOCK; 1137 goto out; 1138 } 1139 m->m_len = 1; 1140 *mtod(m, caddr_t) = tp->t_iobc; 1141 if ((flags & MSG_PEEK) == 0) 1142 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1143 1144 out: 1145 TCPDEBUG2(PRU_RCVOOB); 1146 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1147 INP_WUNLOCK(inp); 1148 return (error); 1149 } 1150 1151 #ifdef INET 1152 struct pr_usrreqs tcp_usrreqs = { 1153 .pru_abort = tcp_usr_abort, 1154 .pru_accept = tcp_usr_accept, 1155 .pru_attach = tcp_usr_attach, 1156 .pru_bind = tcp_usr_bind, 1157 .pru_connect = tcp_usr_connect, 1158 .pru_control = in_control, 1159 .pru_detach = tcp_usr_detach, 1160 .pru_disconnect = tcp_usr_disconnect, 1161 .pru_listen = tcp_usr_listen, 1162 .pru_peeraddr = in_getpeeraddr, 1163 .pru_rcvd = tcp_usr_rcvd, 1164 .pru_rcvoob = tcp_usr_rcvoob, 1165 .pru_send = tcp_usr_send, 1166 .pru_ready = tcp_usr_ready, 1167 .pru_shutdown = tcp_usr_shutdown, 1168 .pru_sockaddr = in_getsockaddr, 1169 .pru_sosetlabel = in_pcbsosetlabel, 1170 .pru_close = tcp_usr_close, 1171 }; 1172 #endif /* INET */ 1173 1174 #ifdef INET6 1175 struct pr_usrreqs tcp6_usrreqs = { 1176 .pru_abort = tcp_usr_abort, 1177 .pru_accept = tcp6_usr_accept, 1178 .pru_attach = tcp_usr_attach, 1179 .pru_bind = tcp6_usr_bind, 1180 .pru_connect = tcp6_usr_connect, 1181 .pru_control = in6_control, 1182 .pru_detach = tcp_usr_detach, 1183 .pru_disconnect = tcp_usr_disconnect, 1184 .pru_listen = tcp6_usr_listen, 1185 .pru_peeraddr = in6_mapped_peeraddr, 1186 .pru_rcvd = tcp_usr_rcvd, 1187 .pru_rcvoob = tcp_usr_rcvoob, 1188 .pru_send = tcp_usr_send, 1189 .pru_ready = tcp_usr_ready, 1190 .pru_shutdown = tcp_usr_shutdown, 1191 .pru_sockaddr = in6_mapped_sockaddr, 1192 .pru_sosetlabel = in_pcbsosetlabel, 1193 .pru_close = tcp_usr_close, 1194 }; 1195 #endif /* INET6 */ 1196 1197 #ifdef INET 1198 /* 1199 * Common subroutine to open a TCP connection to remote host specified 1200 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1201 * port number if needed. Call in_pcbconnect_setup to do the routing and 1202 * to choose a local host address (interface). If there is an existing 1203 * incarnation of the same connection in TIME-WAIT state and if the remote 1204 * host was sending CC options and if the connection duration was < MSL, then 1205 * truncate the previous TIME-WAIT state and proceed. 1206 * Initialize connection parameters and enter SYN-SENT state. 1207 */ 1208 static int 1209 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1210 { 1211 struct inpcb *inp = tp->t_inpcb, *oinp; 1212 struct socket *so = inp->inp_socket; 1213 struct in_addr laddr; 1214 u_short lport; 1215 int error; 1216 1217 INP_WLOCK_ASSERT(inp); 1218 INP_HASH_WLOCK(&V_tcbinfo); 1219 1220 if (inp->inp_lport == 0) { 1221 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1222 if (error) 1223 goto out; 1224 } 1225 1226 /* 1227 * Cannot simply call in_pcbconnect, because there might be an 1228 * earlier incarnation of this same connection still in 1229 * TIME_WAIT state, creating an ADDRINUSE error. 1230 */ 1231 laddr = inp->inp_laddr; 1232 lport = inp->inp_lport; 1233 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1234 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1235 if (error && oinp == NULL) 1236 goto out; 1237 if (oinp) { 1238 error = EADDRINUSE; 1239 goto out; 1240 } 1241 inp->inp_laddr = laddr; 1242 in_pcbrehash(inp); 1243 INP_HASH_WUNLOCK(&V_tcbinfo); 1244 1245 /* 1246 * Compute window scaling to request: 1247 * Scale to fit into sweet spot. See tcp_syncache.c. 1248 * XXX: This should move to tcp_output(). 1249 */ 1250 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1251 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1252 tp->request_r_scale++; 1253 1254 soisconnecting(so); 1255 TCPSTAT_INC(tcps_connattempt); 1256 tcp_state_change(tp, TCPS_SYN_SENT); 1257 tp->iss = tcp_new_isn(tp); 1258 tcp_sendseqinit(tp); 1259 1260 return 0; 1261 1262 out: 1263 INP_HASH_WUNLOCK(&V_tcbinfo); 1264 return (error); 1265 } 1266 #endif /* INET */ 1267 1268 #ifdef INET6 1269 static int 1270 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1271 { 1272 struct inpcb *inp = tp->t_inpcb; 1273 int error; 1274 1275 INP_WLOCK_ASSERT(inp); 1276 INP_HASH_WLOCK(&V_tcbinfo); 1277 1278 if (inp->inp_lport == 0) { 1279 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1280 if (error) 1281 goto out; 1282 } 1283 error = in6_pcbconnect(inp, nam, td->td_ucred); 1284 if (error != 0) 1285 goto out; 1286 INP_HASH_WUNLOCK(&V_tcbinfo); 1287 1288 /* Compute window scaling to request. */ 1289 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1290 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1291 tp->request_r_scale++; 1292 1293 soisconnecting(inp->inp_socket); 1294 TCPSTAT_INC(tcps_connattempt); 1295 tcp_state_change(tp, TCPS_SYN_SENT); 1296 tp->iss = tcp_new_isn(tp); 1297 tcp_sendseqinit(tp); 1298 1299 return 0; 1300 1301 out: 1302 INP_HASH_WUNLOCK(&V_tcbinfo); 1303 return error; 1304 } 1305 #endif /* INET6 */ 1306 1307 /* 1308 * Export TCP internal state information via a struct tcp_info, based on the 1309 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1310 * (TCP state machine, etc). We export all information using FreeBSD-native 1311 * constants -- for example, the numeric values for tcpi_state will differ 1312 * from Linux. 1313 */ 1314 static void 1315 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1316 { 1317 1318 INP_WLOCK_ASSERT(tp->t_inpcb); 1319 bzero(ti, sizeof(*ti)); 1320 1321 ti->tcpi_state = tp->t_state; 1322 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1323 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1324 if (tp->t_flags & TF_SACK_PERMIT) 1325 ti->tcpi_options |= TCPI_OPT_SACK; 1326 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1327 ti->tcpi_options |= TCPI_OPT_WSCALE; 1328 ti->tcpi_snd_wscale = tp->snd_scale; 1329 ti->tcpi_rcv_wscale = tp->rcv_scale; 1330 } 1331 1332 ti->tcpi_rto = tp->t_rxtcur * tick; 1333 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1334 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1335 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1336 1337 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1338 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1339 1340 /* 1341 * FreeBSD-specific extension fields for tcp_info. 1342 */ 1343 ti->tcpi_rcv_space = tp->rcv_wnd; 1344 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1345 ti->tcpi_snd_wnd = tp->snd_wnd; 1346 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1347 ti->tcpi_snd_nxt = tp->snd_nxt; 1348 ti->tcpi_snd_mss = tp->t_maxseg; 1349 ti->tcpi_rcv_mss = tp->t_maxseg; 1350 if (tp->t_flags & TF_TOE) 1351 ti->tcpi_options |= TCPI_OPT_TOE; 1352 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1353 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1354 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1355 } 1356 1357 /* 1358 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1359 * socket option arguments. When it re-acquires the lock after the copy, it 1360 * has to revalidate that the connection is still valid for the socket 1361 * option. 1362 */ 1363 #define INP_WLOCK_RECHECK(inp) do { \ 1364 INP_WLOCK(inp); \ 1365 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1366 INP_WUNLOCK(inp); \ 1367 return (ECONNRESET); \ 1368 } \ 1369 tp = intotcpcb(inp); \ 1370 } while(0) 1371 1372 int 1373 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1374 { 1375 int error; 1376 struct inpcb *inp; 1377 struct tcpcb *tp; 1378 struct tcp_function_block *blk; 1379 struct tcp_function_set fsn; 1380 1381 error = 0; 1382 inp = sotoinpcb(so); 1383 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1384 INP_WLOCK(inp); 1385 if (sopt->sopt_level != IPPROTO_TCP) { 1386 #ifdef INET6 1387 if (inp->inp_vflag & INP_IPV6PROTO) { 1388 INP_WUNLOCK(inp); 1389 error = ip6_ctloutput(so, sopt); 1390 } 1391 #endif /* INET6 */ 1392 #if defined(INET6) && defined(INET) 1393 else 1394 #endif 1395 #ifdef INET 1396 { 1397 INP_WUNLOCK(inp); 1398 error = ip_ctloutput(so, sopt); 1399 } 1400 #endif 1401 return (error); 1402 } 1403 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1404 INP_WUNLOCK(inp); 1405 return (ECONNRESET); 1406 } 1407 tp = intotcpcb(inp); 1408 /* 1409 * Protect the TCP option TCP_FUNCTION_BLK so 1410 * that a sub-function can *never* overwrite this. 1411 */ 1412 if ((sopt->sopt_dir == SOPT_SET) && 1413 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1414 INP_WUNLOCK(inp); 1415 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1416 sizeof fsn); 1417 if (error) 1418 return (error); 1419 INP_WLOCK_RECHECK(inp); 1420 if (tp->t_state != TCPS_CLOSED) { 1421 /* 1422 * The user has advanced the state 1423 * past the initial point, we can't 1424 * switch since we are down the road 1425 * and a new set of functions may 1426 * not be compatibile. 1427 */ 1428 INP_WUNLOCK(inp); 1429 return(EINVAL); 1430 } 1431 blk = find_and_ref_tcp_functions(&fsn); 1432 if (blk == NULL) { 1433 INP_WUNLOCK(inp); 1434 return (ENOENT); 1435 } 1436 if (tp->t_fb != blk) { 1437 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1438 refcount_release(&blk->tfb_refcnt); 1439 INP_WUNLOCK(inp); 1440 return (ENOENT); 1441 } 1442 /* 1443 * Release the old refcnt, the 1444 * lookup acquires a ref on the 1445 * new one. 1446 */ 1447 if (tp->t_fb->tfb_tcp_fb_fini) 1448 (*tp->t_fb->tfb_tcp_fb_fini)(tp); 1449 refcount_release(&tp->t_fb->tfb_refcnt); 1450 tp->t_fb = blk; 1451 if (tp->t_fb->tfb_tcp_fb_init) { 1452 (*tp->t_fb->tfb_tcp_fb_init)(tp); 1453 } 1454 } 1455 #ifdef TCP_OFFLOAD 1456 if (tp->t_flags & TF_TOE) { 1457 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1458 sopt->sopt_name); 1459 } 1460 #endif 1461 INP_WUNLOCK(inp); 1462 return (error); 1463 } else if ((sopt->sopt_dir == SOPT_GET) && 1464 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1465 strcpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name); 1466 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1467 INP_WUNLOCK(inp); 1468 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1469 return (error); 1470 } 1471 /* Pass in the INP locked, called must unlock it */ 1472 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1473 } 1474 1475 int 1476 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1477 { 1478 int error, opt, optval; 1479 u_int ui; 1480 struct tcp_info ti; 1481 struct cc_algo *algo; 1482 char *pbuf, buf[TCP_CA_NAME_MAX]; 1483 size_t len; 1484 1485 /* 1486 * For TCP_CCALGOOPT forward the control to CC module, for both 1487 * SOPT_SET and SOPT_GET. 1488 */ 1489 switch (sopt->sopt_name) { 1490 case TCP_CCALGOOPT: 1491 INP_WUNLOCK(inp); 1492 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1493 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1494 sopt->sopt_valsize); 1495 if (error) { 1496 free(pbuf, M_TEMP); 1497 return (error); 1498 } 1499 INP_WLOCK_RECHECK(inp); 1500 if (CC_ALGO(tp)->ctl_output != NULL) 1501 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1502 else 1503 error = ENOENT; 1504 INP_WUNLOCK(inp); 1505 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1506 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1507 free(pbuf, M_TEMP); 1508 return (error); 1509 } 1510 1511 switch (sopt->sopt_dir) { 1512 case SOPT_SET: 1513 switch (sopt->sopt_name) { 1514 #ifdef TCP_SIGNATURE 1515 case TCP_MD5SIG: 1516 INP_WUNLOCK(inp); 1517 error = sooptcopyin(sopt, &optval, sizeof optval, 1518 sizeof optval); 1519 if (error) 1520 return (error); 1521 1522 INP_WLOCK_RECHECK(inp); 1523 if (optval > 0) 1524 tp->t_flags |= TF_SIGNATURE; 1525 else 1526 tp->t_flags &= ~TF_SIGNATURE; 1527 goto unlock_and_done; 1528 #endif /* TCP_SIGNATURE */ 1529 1530 case TCP_NODELAY: 1531 case TCP_NOOPT: 1532 INP_WUNLOCK(inp); 1533 error = sooptcopyin(sopt, &optval, sizeof optval, 1534 sizeof optval); 1535 if (error) 1536 return (error); 1537 1538 INP_WLOCK_RECHECK(inp); 1539 switch (sopt->sopt_name) { 1540 case TCP_NODELAY: 1541 opt = TF_NODELAY; 1542 break; 1543 case TCP_NOOPT: 1544 opt = TF_NOOPT; 1545 break; 1546 default: 1547 opt = 0; /* dead code to fool gcc */ 1548 break; 1549 } 1550 1551 if (optval) 1552 tp->t_flags |= opt; 1553 else 1554 tp->t_flags &= ~opt; 1555 unlock_and_done: 1556 #ifdef TCP_OFFLOAD 1557 if (tp->t_flags & TF_TOE) { 1558 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1559 sopt->sopt_name); 1560 } 1561 #endif 1562 INP_WUNLOCK(inp); 1563 break; 1564 1565 case TCP_NOPUSH: 1566 INP_WUNLOCK(inp); 1567 error = sooptcopyin(sopt, &optval, sizeof optval, 1568 sizeof optval); 1569 if (error) 1570 return (error); 1571 1572 INP_WLOCK_RECHECK(inp); 1573 if (optval) 1574 tp->t_flags |= TF_NOPUSH; 1575 else if (tp->t_flags & TF_NOPUSH) { 1576 tp->t_flags &= ~TF_NOPUSH; 1577 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1578 error = tp->t_fb->tfb_tcp_output(tp); 1579 } 1580 goto unlock_and_done; 1581 1582 case TCP_MAXSEG: 1583 INP_WUNLOCK(inp); 1584 error = sooptcopyin(sopt, &optval, sizeof optval, 1585 sizeof optval); 1586 if (error) 1587 return (error); 1588 1589 INP_WLOCK_RECHECK(inp); 1590 if (optval > 0 && optval <= tp->t_maxseg && 1591 optval + 40 >= V_tcp_minmss) 1592 tp->t_maxseg = optval; 1593 else 1594 error = EINVAL; 1595 goto unlock_and_done; 1596 1597 case TCP_INFO: 1598 INP_WUNLOCK(inp); 1599 error = EINVAL; 1600 break; 1601 1602 case TCP_CONGESTION: 1603 INP_WUNLOCK(inp); 1604 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1605 if (error) 1606 break; 1607 buf[sopt->sopt_valsize] = '\0'; 1608 INP_WLOCK_RECHECK(inp); 1609 CC_LIST_RLOCK(); 1610 STAILQ_FOREACH(algo, &cc_list, entries) 1611 if (strncmp(buf, algo->name, 1612 TCP_CA_NAME_MAX) == 0) 1613 break; 1614 CC_LIST_RUNLOCK(); 1615 if (algo == NULL) { 1616 INP_WUNLOCK(inp); 1617 error = EINVAL; 1618 break; 1619 } 1620 /* 1621 * We hold a write lock over the tcb so it's safe to 1622 * do these things without ordering concerns. 1623 */ 1624 if (CC_ALGO(tp)->cb_destroy != NULL) 1625 CC_ALGO(tp)->cb_destroy(tp->ccv); 1626 CC_ALGO(tp) = algo; 1627 /* 1628 * If something goes pear shaped initialising the new 1629 * algo, fall back to newreno (which does not 1630 * require initialisation). 1631 */ 1632 if (algo->cb_init != NULL && 1633 algo->cb_init(tp->ccv) != 0) { 1634 CC_ALGO(tp) = &newreno_cc_algo; 1635 /* 1636 * The only reason init should fail is 1637 * because of malloc. 1638 */ 1639 error = ENOMEM; 1640 } 1641 INP_WUNLOCK(inp); 1642 break; 1643 1644 case TCP_KEEPIDLE: 1645 case TCP_KEEPINTVL: 1646 case TCP_KEEPINIT: 1647 INP_WUNLOCK(inp); 1648 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1649 if (error) 1650 return (error); 1651 1652 if (ui > (UINT_MAX / hz)) { 1653 error = EINVAL; 1654 break; 1655 } 1656 ui *= hz; 1657 1658 INP_WLOCK_RECHECK(inp); 1659 switch (sopt->sopt_name) { 1660 case TCP_KEEPIDLE: 1661 tp->t_keepidle = ui; 1662 /* 1663 * XXX: better check current remaining 1664 * timeout and "merge" it with new value. 1665 */ 1666 if ((tp->t_state > TCPS_LISTEN) && 1667 (tp->t_state <= TCPS_CLOSING)) 1668 tcp_timer_activate(tp, TT_KEEP, 1669 TP_KEEPIDLE(tp)); 1670 break; 1671 case TCP_KEEPINTVL: 1672 tp->t_keepintvl = ui; 1673 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1674 (TP_MAXIDLE(tp) > 0)) 1675 tcp_timer_activate(tp, TT_2MSL, 1676 TP_MAXIDLE(tp)); 1677 break; 1678 case TCP_KEEPINIT: 1679 tp->t_keepinit = ui; 1680 if (tp->t_state == TCPS_SYN_RECEIVED || 1681 tp->t_state == TCPS_SYN_SENT) 1682 tcp_timer_activate(tp, TT_KEEP, 1683 TP_KEEPINIT(tp)); 1684 break; 1685 } 1686 goto unlock_and_done; 1687 1688 case TCP_KEEPCNT: 1689 INP_WUNLOCK(inp); 1690 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1691 if (error) 1692 return (error); 1693 1694 INP_WLOCK_RECHECK(inp); 1695 tp->t_keepcnt = ui; 1696 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1697 (TP_MAXIDLE(tp) > 0)) 1698 tcp_timer_activate(tp, TT_2MSL, 1699 TP_MAXIDLE(tp)); 1700 goto unlock_and_done; 1701 1702 #ifdef TCPPCAP 1703 case TCP_PCAP_OUT: 1704 case TCP_PCAP_IN: 1705 INP_WUNLOCK(inp); 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 >= 0) 1713 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1714 &(tp->t_outpkts) : &(tp->t_inpkts), 1715 optval); 1716 else 1717 error = EINVAL; 1718 goto unlock_and_done; 1719 #endif 1720 1721 #ifdef TCP_RFC7413 1722 case TCP_FASTOPEN: 1723 INP_WUNLOCK(inp); 1724 if (!V_tcp_fastopen_enabled) 1725 return (EPERM); 1726 1727 error = sooptcopyin(sopt, &optval, sizeof optval, 1728 sizeof optval); 1729 if (error) 1730 return (error); 1731 1732 INP_WLOCK_RECHECK(inp); 1733 if (optval) { 1734 tp->t_flags |= TF_FASTOPEN; 1735 if ((tp->t_state == TCPS_LISTEN) && 1736 (tp->t_tfo_pending == NULL)) 1737 tp->t_tfo_pending = 1738 tcp_fastopen_alloc_counter(); 1739 } else 1740 tp->t_flags &= ~TF_FASTOPEN; 1741 goto unlock_and_done; 1742 #endif 1743 1744 default: 1745 INP_WUNLOCK(inp); 1746 error = ENOPROTOOPT; 1747 break; 1748 } 1749 break; 1750 1751 case SOPT_GET: 1752 tp = intotcpcb(inp); 1753 switch (sopt->sopt_name) { 1754 #ifdef TCP_SIGNATURE 1755 case TCP_MD5SIG: 1756 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1757 INP_WUNLOCK(inp); 1758 error = sooptcopyout(sopt, &optval, sizeof optval); 1759 break; 1760 #endif 1761 1762 case TCP_NODELAY: 1763 optval = tp->t_flags & TF_NODELAY; 1764 INP_WUNLOCK(inp); 1765 error = sooptcopyout(sopt, &optval, sizeof optval); 1766 break; 1767 case TCP_MAXSEG: 1768 optval = tp->t_maxseg; 1769 INP_WUNLOCK(inp); 1770 error = sooptcopyout(sopt, &optval, sizeof optval); 1771 break; 1772 case TCP_NOOPT: 1773 optval = tp->t_flags & TF_NOOPT; 1774 INP_WUNLOCK(inp); 1775 error = sooptcopyout(sopt, &optval, sizeof optval); 1776 break; 1777 case TCP_NOPUSH: 1778 optval = tp->t_flags & TF_NOPUSH; 1779 INP_WUNLOCK(inp); 1780 error = sooptcopyout(sopt, &optval, sizeof optval); 1781 break; 1782 case TCP_INFO: 1783 tcp_fill_info(tp, &ti); 1784 INP_WUNLOCK(inp); 1785 error = sooptcopyout(sopt, &ti, sizeof ti); 1786 break; 1787 case TCP_CONGESTION: 1788 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1789 INP_WUNLOCK(inp); 1790 error = sooptcopyout(sopt, buf, len + 1); 1791 break; 1792 case TCP_KEEPIDLE: 1793 case TCP_KEEPINTVL: 1794 case TCP_KEEPINIT: 1795 case TCP_KEEPCNT: 1796 switch (sopt->sopt_name) { 1797 case TCP_KEEPIDLE: 1798 ui = tp->t_keepidle / hz; 1799 break; 1800 case TCP_KEEPINTVL: 1801 ui = tp->t_keepintvl / hz; 1802 break; 1803 case TCP_KEEPINIT: 1804 ui = tp->t_keepinit / hz; 1805 break; 1806 case TCP_KEEPCNT: 1807 ui = tp->t_keepcnt; 1808 break; 1809 } 1810 INP_WUNLOCK(inp); 1811 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1812 break; 1813 #ifdef TCPPCAP 1814 case TCP_PCAP_OUT: 1815 case TCP_PCAP_IN: 1816 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1817 &(tp->t_outpkts) : &(tp->t_inpkts)); 1818 INP_WUNLOCK(inp); 1819 error = sooptcopyout(sopt, &optval, sizeof optval); 1820 break; 1821 #endif 1822 1823 #ifdef TCP_RFC7413 1824 case TCP_FASTOPEN: 1825 optval = tp->t_flags & TF_FASTOPEN; 1826 INP_WUNLOCK(inp); 1827 error = sooptcopyout(sopt, &optval, sizeof optval); 1828 break; 1829 #endif 1830 default: 1831 INP_WUNLOCK(inp); 1832 error = ENOPROTOOPT; 1833 break; 1834 } 1835 break; 1836 } 1837 return (error); 1838 } 1839 #undef INP_WLOCK_RECHECK 1840 1841 /* 1842 * Attach TCP protocol to socket, allocating 1843 * internet protocol control block, tcp control block, 1844 * bufer space, and entering LISTEN state if to accept connections. 1845 */ 1846 static int 1847 tcp_attach(struct socket *so) 1848 { 1849 struct tcpcb *tp; 1850 struct inpcb *inp; 1851 int error; 1852 1853 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1854 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1855 if (error) 1856 return (error); 1857 } 1858 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1859 so->so_snd.sb_flags |= SB_AUTOSIZE; 1860 INP_INFO_RLOCK(&V_tcbinfo); 1861 error = in_pcballoc(so, &V_tcbinfo); 1862 if (error) { 1863 INP_INFO_RUNLOCK(&V_tcbinfo); 1864 return (error); 1865 } 1866 inp = sotoinpcb(so); 1867 #ifdef INET6 1868 if (inp->inp_vflag & INP_IPV6PROTO) { 1869 inp->inp_vflag |= INP_IPV6; 1870 inp->in6p_hops = -1; /* use kernel default */ 1871 } 1872 else 1873 #endif 1874 inp->inp_vflag |= INP_IPV4; 1875 tp = tcp_newtcpcb(inp); 1876 if (tp == NULL) { 1877 in_pcbdetach(inp); 1878 in_pcbfree(inp); 1879 INP_INFO_RUNLOCK(&V_tcbinfo); 1880 return (ENOBUFS); 1881 } 1882 tp->t_state = TCPS_CLOSED; 1883 INP_WUNLOCK(inp); 1884 INP_INFO_RUNLOCK(&V_tcbinfo); 1885 TCPSTAT_INC(tcps_states[TCPS_CLOSED]); 1886 return (0); 1887 } 1888 1889 /* 1890 * Initiate (or continue) disconnect. 1891 * If embryonic state, just send reset (once). 1892 * If in ``let data drain'' option and linger null, just drop. 1893 * Otherwise (hard), mark socket disconnecting and drop 1894 * current input data; switch states based on user close, and 1895 * send segment to peer (with FIN). 1896 */ 1897 static void 1898 tcp_disconnect(struct tcpcb *tp) 1899 { 1900 struct inpcb *inp = tp->t_inpcb; 1901 struct socket *so = inp->inp_socket; 1902 1903 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1904 INP_WLOCK_ASSERT(inp); 1905 1906 /* 1907 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1908 * socket is still open. 1909 */ 1910 if (tp->t_state < TCPS_ESTABLISHED) { 1911 tp = tcp_close(tp); 1912 KASSERT(tp != NULL, 1913 ("tcp_disconnect: tcp_close() returned NULL")); 1914 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1915 tp = tcp_drop(tp, 0); 1916 KASSERT(tp != NULL, 1917 ("tcp_disconnect: tcp_drop() returned NULL")); 1918 } else { 1919 soisdisconnecting(so); 1920 sbflush(&so->so_rcv); 1921 tcp_usrclosed(tp); 1922 if (!(inp->inp_flags & INP_DROPPED)) 1923 tp->t_fb->tfb_tcp_output(tp); 1924 } 1925 } 1926 1927 /* 1928 * User issued close, and wish to trail through shutdown states: 1929 * if never received SYN, just forget it. If got a SYN from peer, 1930 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1931 * If already got a FIN from peer, then almost done; go to LAST_ACK 1932 * state. In all other cases, have already sent FIN to peer (e.g. 1933 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1934 * for peer to send FIN or not respond to keep-alives, etc. 1935 * We can let the user exit from the close as soon as the FIN is acked. 1936 */ 1937 static void 1938 tcp_usrclosed(struct tcpcb *tp) 1939 { 1940 1941 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1942 INP_WLOCK_ASSERT(tp->t_inpcb); 1943 1944 switch (tp->t_state) { 1945 case TCPS_LISTEN: 1946 #ifdef TCP_OFFLOAD 1947 tcp_offload_listen_stop(tp); 1948 #endif 1949 tcp_state_change(tp, TCPS_CLOSED); 1950 /* FALLTHROUGH */ 1951 case TCPS_CLOSED: 1952 tp = tcp_close(tp); 1953 /* 1954 * tcp_close() should never return NULL here as the socket is 1955 * still open. 1956 */ 1957 KASSERT(tp != NULL, 1958 ("tcp_usrclosed: tcp_close() returned NULL")); 1959 break; 1960 1961 case TCPS_SYN_SENT: 1962 case TCPS_SYN_RECEIVED: 1963 tp->t_flags |= TF_NEEDFIN; 1964 break; 1965 1966 case TCPS_ESTABLISHED: 1967 tcp_state_change(tp, TCPS_FIN_WAIT_1); 1968 break; 1969 1970 case TCPS_CLOSE_WAIT: 1971 tcp_state_change(tp, TCPS_LAST_ACK); 1972 break; 1973 } 1974 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1975 soisdisconnected(tp->t_inpcb->inp_socket); 1976 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1977 if (tp->t_state == TCPS_FIN_WAIT_2) { 1978 int timeout; 1979 1980 timeout = (tcp_fast_finwait2_recycle) ? 1981 tcp_finwait2_timeout : TP_MAXIDLE(tp); 1982 tcp_timer_activate(tp, TT_2MSL, timeout); 1983 } 1984 } 1985 } 1986 1987 #ifdef DDB 1988 static void 1989 db_print_indent(int indent) 1990 { 1991 int i; 1992 1993 for (i = 0; i < indent; i++) 1994 db_printf(" "); 1995 } 1996 1997 static void 1998 db_print_tstate(int t_state) 1999 { 2000 2001 switch (t_state) { 2002 case TCPS_CLOSED: 2003 db_printf("TCPS_CLOSED"); 2004 return; 2005 2006 case TCPS_LISTEN: 2007 db_printf("TCPS_LISTEN"); 2008 return; 2009 2010 case TCPS_SYN_SENT: 2011 db_printf("TCPS_SYN_SENT"); 2012 return; 2013 2014 case TCPS_SYN_RECEIVED: 2015 db_printf("TCPS_SYN_RECEIVED"); 2016 return; 2017 2018 case TCPS_ESTABLISHED: 2019 db_printf("TCPS_ESTABLISHED"); 2020 return; 2021 2022 case TCPS_CLOSE_WAIT: 2023 db_printf("TCPS_CLOSE_WAIT"); 2024 return; 2025 2026 case TCPS_FIN_WAIT_1: 2027 db_printf("TCPS_FIN_WAIT_1"); 2028 return; 2029 2030 case TCPS_CLOSING: 2031 db_printf("TCPS_CLOSING"); 2032 return; 2033 2034 case TCPS_LAST_ACK: 2035 db_printf("TCPS_LAST_ACK"); 2036 return; 2037 2038 case TCPS_FIN_WAIT_2: 2039 db_printf("TCPS_FIN_WAIT_2"); 2040 return; 2041 2042 case TCPS_TIME_WAIT: 2043 db_printf("TCPS_TIME_WAIT"); 2044 return; 2045 2046 default: 2047 db_printf("unknown"); 2048 return; 2049 } 2050 } 2051 2052 static void 2053 db_print_tflags(u_int t_flags) 2054 { 2055 int comma; 2056 2057 comma = 0; 2058 if (t_flags & TF_ACKNOW) { 2059 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2060 comma = 1; 2061 } 2062 if (t_flags & TF_DELACK) { 2063 db_printf("%sTF_DELACK", comma ? ", " : ""); 2064 comma = 1; 2065 } 2066 if (t_flags & TF_NODELAY) { 2067 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2068 comma = 1; 2069 } 2070 if (t_flags & TF_NOOPT) { 2071 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2072 comma = 1; 2073 } 2074 if (t_flags & TF_SENTFIN) { 2075 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2076 comma = 1; 2077 } 2078 if (t_flags & TF_REQ_SCALE) { 2079 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2080 comma = 1; 2081 } 2082 if (t_flags & TF_RCVD_SCALE) { 2083 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2084 comma = 1; 2085 } 2086 if (t_flags & TF_REQ_TSTMP) { 2087 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2088 comma = 1; 2089 } 2090 if (t_flags & TF_RCVD_TSTMP) { 2091 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2092 comma = 1; 2093 } 2094 if (t_flags & TF_SACK_PERMIT) { 2095 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2096 comma = 1; 2097 } 2098 if (t_flags & TF_NEEDSYN) { 2099 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2100 comma = 1; 2101 } 2102 if (t_flags & TF_NEEDFIN) { 2103 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2104 comma = 1; 2105 } 2106 if (t_flags & TF_NOPUSH) { 2107 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2108 comma = 1; 2109 } 2110 if (t_flags & TF_MORETOCOME) { 2111 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2112 comma = 1; 2113 } 2114 if (t_flags & TF_LQ_OVERFLOW) { 2115 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2116 comma = 1; 2117 } 2118 if (t_flags & TF_LASTIDLE) { 2119 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2120 comma = 1; 2121 } 2122 if (t_flags & TF_RXWIN0SENT) { 2123 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2124 comma = 1; 2125 } 2126 if (t_flags & TF_FASTRECOVERY) { 2127 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2128 comma = 1; 2129 } 2130 if (t_flags & TF_CONGRECOVERY) { 2131 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2132 comma = 1; 2133 } 2134 if (t_flags & TF_WASFRECOVERY) { 2135 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2136 comma = 1; 2137 } 2138 if (t_flags & TF_SIGNATURE) { 2139 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2140 comma = 1; 2141 } 2142 if (t_flags & TF_FORCEDATA) { 2143 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2144 comma = 1; 2145 } 2146 if (t_flags & TF_TSO) { 2147 db_printf("%sTF_TSO", comma ? ", " : ""); 2148 comma = 1; 2149 } 2150 if (t_flags & TF_ECN_PERMIT) { 2151 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2152 comma = 1; 2153 } 2154 if (t_flags & TF_FASTOPEN) { 2155 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2156 comma = 1; 2157 } 2158 } 2159 2160 static void 2161 db_print_toobflags(char t_oobflags) 2162 { 2163 int comma; 2164 2165 comma = 0; 2166 if (t_oobflags & TCPOOB_HAVEDATA) { 2167 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2168 comma = 1; 2169 } 2170 if (t_oobflags & TCPOOB_HADDATA) { 2171 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2172 comma = 1; 2173 } 2174 } 2175 2176 static void 2177 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2178 { 2179 2180 db_print_indent(indent); 2181 db_printf("%s at %p\n", name, tp); 2182 2183 indent += 2; 2184 2185 db_print_indent(indent); 2186 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2187 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2188 2189 db_print_indent(indent); 2190 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2191 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2192 2193 db_print_indent(indent); 2194 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2195 &tp->t_timers->tt_delack, tp->t_inpcb); 2196 2197 db_print_indent(indent); 2198 db_printf("t_state: %d (", tp->t_state); 2199 db_print_tstate(tp->t_state); 2200 db_printf(")\n"); 2201 2202 db_print_indent(indent); 2203 db_printf("t_flags: 0x%x (", tp->t_flags); 2204 db_print_tflags(tp->t_flags); 2205 db_printf(")\n"); 2206 2207 db_print_indent(indent); 2208 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2209 tp->snd_una, tp->snd_max, tp->snd_nxt); 2210 2211 db_print_indent(indent); 2212 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2213 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2214 2215 db_print_indent(indent); 2216 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2217 tp->iss, tp->irs, tp->rcv_nxt); 2218 2219 db_print_indent(indent); 2220 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2221 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2222 2223 db_print_indent(indent); 2224 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2225 tp->snd_wnd, tp->snd_cwnd); 2226 2227 db_print_indent(indent); 2228 db_printf("snd_ssthresh: %lu snd_recover: " 2229 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2230 2231 db_print_indent(indent); 2232 db_printf("t_rcvtime: %u t_startime: %u\n", 2233 tp->t_rcvtime, tp->t_starttime); 2234 2235 db_print_indent(indent); 2236 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2237 tp->t_rtttime, tp->t_rtseq); 2238 2239 db_print_indent(indent); 2240 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2241 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2242 2243 db_print_indent(indent); 2244 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2245 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2246 tp->t_rttbest); 2247 2248 db_print_indent(indent); 2249 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2250 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2251 2252 db_print_indent(indent); 2253 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2254 db_print_toobflags(tp->t_oobflags); 2255 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2256 2257 db_print_indent(indent); 2258 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2259 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2260 2261 db_print_indent(indent); 2262 db_printf("ts_recent: %u ts_recent_age: %u\n", 2263 tp->ts_recent, tp->ts_recent_age); 2264 2265 db_print_indent(indent); 2266 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2267 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2268 2269 db_print_indent(indent); 2270 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2271 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2272 tp->snd_recover_prev, tp->t_badrxtwin); 2273 2274 db_print_indent(indent); 2275 db_printf("snd_numholes: %d snd_holes first: %p\n", 2276 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2277 2278 db_print_indent(indent); 2279 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2280 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2281 2282 /* Skip sackblks, sackhint. */ 2283 2284 db_print_indent(indent); 2285 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2286 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2287 } 2288 2289 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2290 { 2291 struct tcpcb *tp; 2292 2293 if (!have_addr) { 2294 db_printf("usage: show tcpcb <addr>\n"); 2295 return; 2296 } 2297 tp = (struct tcpcb *)addr; 2298 2299 db_print_tcpcb(tp, "tcpcb", 0); 2300 } 2301 #endif 2302