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 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 529 INP_WUNLOCK(inp); 530 return (error); 531 } 532 #endif /* INET */ 533 534 #ifdef INET6 535 static int 536 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 537 { 538 int error = 0; 539 struct inpcb *inp; 540 struct tcpcb *tp = NULL; 541 struct sockaddr_in6 *sin6p; 542 543 TCPDEBUG0; 544 545 sin6p = (struct sockaddr_in6 *)nam; 546 if (nam->sa_len != sizeof (*sin6p)) 547 return (EINVAL); 548 /* 549 * Must disallow TCP ``connections'' to multicast addresses. 550 */ 551 if (sin6p->sin6_family == AF_INET6 552 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 553 return (EAFNOSUPPORT); 554 555 inp = sotoinpcb(so); 556 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 557 INP_WLOCK(inp); 558 if (inp->inp_flags & INP_TIMEWAIT) { 559 error = EADDRINUSE; 560 goto out; 561 } 562 if (inp->inp_flags & INP_DROPPED) { 563 error = ECONNREFUSED; 564 goto out; 565 } 566 tp = intotcpcb(inp); 567 TCPDEBUG1(); 568 #ifdef INET 569 /* 570 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 571 * therefore probably require the hash lock, which isn't held here. 572 * Is this a significant problem? 573 */ 574 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 575 struct sockaddr_in sin; 576 577 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 578 error = EINVAL; 579 goto out; 580 } 581 582 in6_sin6_2_sin(&sin, sin6p); 583 inp->inp_vflag |= INP_IPV4; 584 inp->inp_vflag &= ~INP_IPV6; 585 if ((error = prison_remote_ip4(td->td_ucred, 586 &sin.sin_addr)) != 0) 587 goto out; 588 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 589 goto out; 590 #ifdef TCP_OFFLOAD 591 if (registered_toedevs > 0 && 592 (so->so_options & SO_NO_OFFLOAD) == 0 && 593 (error = tcp_offload_connect(so, nam)) == 0) 594 goto out; 595 #endif 596 error = tp->t_fb->tfb_tcp_output(tp); 597 goto out; 598 } 599 #endif 600 inp->inp_vflag &= ~INP_IPV4; 601 inp->inp_vflag |= INP_IPV6; 602 inp->inp_inc.inc_flags |= INC_ISIPV6; 603 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 604 goto out; 605 if ((error = tcp6_connect(tp, nam, td)) != 0) 606 goto out; 607 #ifdef TCP_OFFLOAD 608 if (registered_toedevs > 0 && 609 (so->so_options & SO_NO_OFFLOAD) == 0 && 610 (error = tcp_offload_connect(so, nam)) == 0) 611 goto out; 612 #endif 613 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 614 error = tp->t_fb->tfb_tcp_output(tp); 615 616 out: 617 TCPDEBUG2(PRU_CONNECT); 618 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 619 INP_WUNLOCK(inp); 620 return (error); 621 } 622 #endif /* INET6 */ 623 624 /* 625 * Initiate disconnect from peer. 626 * If connection never passed embryonic stage, just drop; 627 * else if don't need to let data drain, then can just drop anyways, 628 * else have to begin TCP shutdown process: mark socket disconnecting, 629 * drain unread data, state switch to reflect user close, and 630 * send segment (e.g. FIN) to peer. Socket will be really disconnected 631 * when peer sends FIN and acks ours. 632 * 633 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 634 */ 635 static int 636 tcp_usr_disconnect(struct socket *so) 637 { 638 struct inpcb *inp; 639 struct tcpcb *tp = NULL; 640 int error = 0; 641 642 TCPDEBUG0; 643 INP_INFO_RLOCK(&V_tcbinfo); 644 inp = sotoinpcb(so); 645 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 646 INP_WLOCK(inp); 647 if (inp->inp_flags & INP_TIMEWAIT) 648 goto out; 649 if (inp->inp_flags & INP_DROPPED) { 650 error = ECONNRESET; 651 goto out; 652 } 653 tp = intotcpcb(inp); 654 TCPDEBUG1(); 655 tcp_disconnect(tp); 656 out: 657 TCPDEBUG2(PRU_DISCONNECT); 658 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 659 INP_WUNLOCK(inp); 660 INP_INFO_RUNLOCK(&V_tcbinfo); 661 return (error); 662 } 663 664 #ifdef INET 665 /* 666 * Accept a connection. Essentially all the work is done at higher levels; 667 * just return the address of the peer, storing through addr. 668 */ 669 static int 670 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 671 { 672 int error = 0; 673 struct inpcb *inp = NULL; 674 struct tcpcb *tp = NULL; 675 struct in_addr addr; 676 in_port_t port = 0; 677 TCPDEBUG0; 678 679 if (so->so_state & SS_ISDISCONNECTED) 680 return (ECONNABORTED); 681 682 inp = sotoinpcb(so); 683 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 684 INP_WLOCK(inp); 685 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 686 error = ECONNABORTED; 687 goto out; 688 } 689 tp = intotcpcb(inp); 690 TCPDEBUG1(); 691 692 /* 693 * We inline in_getpeeraddr and COMMON_END here, so that we can 694 * copy the data of interest and defer the malloc until after we 695 * release the lock. 696 */ 697 port = inp->inp_fport; 698 addr = inp->inp_faddr; 699 700 out: 701 TCPDEBUG2(PRU_ACCEPT); 702 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 703 INP_WUNLOCK(inp); 704 if (error == 0) 705 *nam = in_sockaddr(port, &addr); 706 return error; 707 } 708 #endif /* INET */ 709 710 #ifdef INET6 711 static int 712 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 713 { 714 struct inpcb *inp = NULL; 715 int error = 0; 716 struct tcpcb *tp = NULL; 717 struct in_addr addr; 718 struct in6_addr addr6; 719 in_port_t port = 0; 720 int v4 = 0; 721 TCPDEBUG0; 722 723 if (so->so_state & SS_ISDISCONNECTED) 724 return (ECONNABORTED); 725 726 inp = sotoinpcb(so); 727 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 728 INP_INFO_RLOCK(&V_tcbinfo); 729 INP_WLOCK(inp); 730 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 731 error = ECONNABORTED; 732 goto out; 733 } 734 tp = intotcpcb(inp); 735 TCPDEBUG1(); 736 737 /* 738 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 739 * copy the data of interest and defer the malloc until after we 740 * release the lock. 741 */ 742 if (inp->inp_vflag & INP_IPV4) { 743 v4 = 1; 744 port = inp->inp_fport; 745 addr = inp->inp_faddr; 746 } else { 747 port = inp->inp_fport; 748 addr6 = inp->in6p_faddr; 749 } 750 751 out: 752 TCPDEBUG2(PRU_ACCEPT); 753 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 754 INP_WUNLOCK(inp); 755 INP_INFO_RUNLOCK(&V_tcbinfo); 756 if (error == 0) { 757 if (v4) 758 *nam = in6_v4mapsin6_sockaddr(port, &addr); 759 else 760 *nam = in6_sockaddr(port, &addr6); 761 } 762 return error; 763 } 764 #endif /* INET6 */ 765 766 /* 767 * Mark the connection as being incapable of further output. 768 */ 769 static int 770 tcp_usr_shutdown(struct socket *so) 771 { 772 int error = 0; 773 struct inpcb *inp; 774 struct tcpcb *tp = NULL; 775 776 TCPDEBUG0; 777 INP_INFO_RLOCK(&V_tcbinfo); 778 inp = sotoinpcb(so); 779 KASSERT(inp != NULL, ("inp == NULL")); 780 INP_WLOCK(inp); 781 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 782 error = ECONNRESET; 783 goto out; 784 } 785 tp = intotcpcb(inp); 786 TCPDEBUG1(); 787 socantsendmore(so); 788 tcp_usrclosed(tp); 789 if (!(inp->inp_flags & INP_DROPPED)) 790 error = tp->t_fb->tfb_tcp_output(tp); 791 792 out: 793 TCPDEBUG2(PRU_SHUTDOWN); 794 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 795 INP_WUNLOCK(inp); 796 INP_INFO_RUNLOCK(&V_tcbinfo); 797 798 return (error); 799 } 800 801 /* 802 * After a receive, possibly send window update to peer. 803 */ 804 static int 805 tcp_usr_rcvd(struct socket *so, int flags) 806 { 807 struct inpcb *inp; 808 struct tcpcb *tp = NULL; 809 int error = 0; 810 811 TCPDEBUG0; 812 inp = sotoinpcb(so); 813 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 814 INP_WLOCK(inp); 815 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 816 error = ECONNRESET; 817 goto out; 818 } 819 tp = intotcpcb(inp); 820 TCPDEBUG1(); 821 #ifdef TCP_RFC7413 822 /* 823 * For passively-created TFO connections, don't attempt a window 824 * update while still in SYN_RECEIVED as this may trigger an early 825 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 826 * application response data, or failing that, when the DELACK timer 827 * expires. 828 */ 829 if ((tp->t_flags & TF_FASTOPEN) && 830 (tp->t_state == TCPS_SYN_RECEIVED)) 831 goto out; 832 #endif 833 #ifdef TCP_OFFLOAD 834 if (tp->t_flags & TF_TOE) 835 tcp_offload_rcvd(tp); 836 else 837 #endif 838 tp->t_fb->tfb_tcp_output(tp); 839 840 out: 841 TCPDEBUG2(PRU_RCVD); 842 TCP_PROBE2(debug__user, tp, PRU_RCVD); 843 INP_WUNLOCK(inp); 844 return (error); 845 } 846 847 /* 848 * Do a send by putting data in output queue and updating urgent 849 * marker if URG set. Possibly send more data. Unlike the other 850 * pru_*() routines, the mbuf chains are our responsibility. We 851 * must either enqueue them or free them. The other pru_* routines 852 * generally are caller-frees. 853 */ 854 static int 855 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 856 struct sockaddr *nam, struct mbuf *control, struct thread *td) 857 { 858 int error = 0; 859 struct inpcb *inp; 860 struct tcpcb *tp = NULL; 861 #ifdef INET6 862 int isipv6; 863 #endif 864 TCPDEBUG0; 865 866 /* 867 * We require the pcbinfo lock if we will close the socket as part of 868 * this call. 869 */ 870 if (flags & PRUS_EOF) 871 INP_INFO_RLOCK(&V_tcbinfo); 872 inp = sotoinpcb(so); 873 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 874 INP_WLOCK(inp); 875 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 876 if (control) 877 m_freem(control); 878 /* 879 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 880 * for freeing memory. 881 */ 882 if (m && (flags & PRUS_NOTREADY) == 0) 883 m_freem(m); 884 error = ECONNRESET; 885 goto out; 886 } 887 #ifdef INET6 888 isipv6 = nam && nam->sa_family == AF_INET6; 889 #endif /* INET6 */ 890 tp = intotcpcb(inp); 891 TCPDEBUG1(); 892 if (control) { 893 /* TCP doesn't do control messages (rights, creds, etc) */ 894 if (control->m_len) { 895 m_freem(control); 896 if (m) 897 m_freem(m); 898 error = EINVAL; 899 goto out; 900 } 901 m_freem(control); /* empty control, just free it */ 902 } 903 if (!(flags & PRUS_OOB)) { 904 sbappendstream(&so->so_snd, m, flags); 905 if (nam && tp->t_state < TCPS_SYN_SENT) { 906 /* 907 * Do implied connect if not yet connected, 908 * initialize window to default value, and 909 * initialize maxseg using peer's cached MSS. 910 */ 911 #ifdef INET6 912 if (isipv6) 913 error = tcp6_connect(tp, nam, td); 914 #endif /* INET6 */ 915 #if defined(INET6) && defined(INET) 916 else 917 #endif 918 #ifdef INET 919 error = tcp_connect(tp, nam, td); 920 #endif 921 if (error) 922 goto out; 923 tp->snd_wnd = TTCP_CLIENT_SND_WND; 924 tcp_mss(tp, -1); 925 } 926 if (flags & PRUS_EOF) { 927 /* 928 * Close the send side of the connection after 929 * the data is sent. 930 */ 931 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 932 socantsendmore(so); 933 tcp_usrclosed(tp); 934 } 935 if (!(inp->inp_flags & INP_DROPPED) && 936 !(flags & PRUS_NOTREADY)) { 937 if (flags & PRUS_MORETOCOME) 938 tp->t_flags |= TF_MORETOCOME; 939 error = tp->t_fb->tfb_tcp_output(tp); 940 if (flags & PRUS_MORETOCOME) 941 tp->t_flags &= ~TF_MORETOCOME; 942 } 943 } else { 944 /* 945 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 946 */ 947 SOCKBUF_LOCK(&so->so_snd); 948 if (sbspace(&so->so_snd) < -512) { 949 SOCKBUF_UNLOCK(&so->so_snd); 950 m_freem(m); 951 error = ENOBUFS; 952 goto out; 953 } 954 /* 955 * According to RFC961 (Assigned Protocols), 956 * the urgent pointer points to the last octet 957 * of urgent data. We continue, however, 958 * to consider it to indicate the first octet 959 * of data past the urgent section. 960 * Otherwise, snd_up should be one lower. 961 */ 962 sbappendstream_locked(&so->so_snd, m, flags); 963 SOCKBUF_UNLOCK(&so->so_snd); 964 if (nam && tp->t_state < TCPS_SYN_SENT) { 965 /* 966 * Do implied connect if not yet connected, 967 * initialize window to default value, and 968 * initialize maxseg using peer's cached 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_CLEANUP(inp, cleanup) do { \ 1365 INP_WLOCK(inp); \ 1366 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1367 INP_WUNLOCK(inp); \ 1368 cleanup; \ 1369 return (ECONNRESET); \ 1370 } \ 1371 tp = intotcpcb(inp); \ 1372 } while(0) 1373 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1374 1375 int 1376 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1377 { 1378 int error; 1379 struct inpcb *inp; 1380 struct tcpcb *tp; 1381 struct tcp_function_block *blk; 1382 struct tcp_function_set fsn; 1383 1384 error = 0; 1385 inp = sotoinpcb(so); 1386 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1387 INP_WLOCK(inp); 1388 if (sopt->sopt_level != IPPROTO_TCP) { 1389 #ifdef INET6 1390 if (inp->inp_vflag & INP_IPV6PROTO) { 1391 INP_WUNLOCK(inp); 1392 error = ip6_ctloutput(so, sopt); 1393 } 1394 #endif /* INET6 */ 1395 #if defined(INET6) && defined(INET) 1396 else 1397 #endif 1398 #ifdef INET 1399 { 1400 INP_WUNLOCK(inp); 1401 error = ip_ctloutput(so, sopt); 1402 } 1403 #endif 1404 return (error); 1405 } 1406 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1407 INP_WUNLOCK(inp); 1408 return (ECONNRESET); 1409 } 1410 tp = intotcpcb(inp); 1411 /* 1412 * Protect the TCP option TCP_FUNCTION_BLK so 1413 * that a sub-function can *never* overwrite this. 1414 */ 1415 if ((sopt->sopt_dir == SOPT_SET) && 1416 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1417 INP_WUNLOCK(inp); 1418 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1419 sizeof fsn); 1420 if (error) 1421 return (error); 1422 INP_WLOCK_RECHECK(inp); 1423 blk = find_and_ref_tcp_functions(&fsn); 1424 if (blk == NULL) { 1425 INP_WUNLOCK(inp); 1426 return (ENOENT); 1427 } 1428 if (tp->t_fb == blk) { 1429 /* You already have this */ 1430 refcount_release(&blk->tfb_refcnt); 1431 INP_WUNLOCK(inp); 1432 return (0); 1433 } 1434 if (tp->t_state != TCPS_CLOSED) { 1435 int error=EINVAL; 1436 /* 1437 * The user has advanced the state 1438 * past the initial point, we may not 1439 * be able to switch. 1440 */ 1441 if (blk->tfb_tcp_handoff_ok != NULL) { 1442 /* 1443 * Does the stack provide a 1444 * query mechanism, if so it may 1445 * still be possible? 1446 */ 1447 error = (*blk->tfb_tcp_handoff_ok)(tp); 1448 } 1449 if (error) { 1450 refcount_release(&blk->tfb_refcnt); 1451 INP_WUNLOCK(inp); 1452 return(error); 1453 } 1454 } 1455 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1456 refcount_release(&blk->tfb_refcnt); 1457 INP_WUNLOCK(inp); 1458 return (ENOENT); 1459 } 1460 /* 1461 * Release the old refcnt, the 1462 * lookup acquired a ref on the 1463 * new one already. 1464 */ 1465 if (tp->t_fb->tfb_tcp_fb_fini) { 1466 /* 1467 * Tell the stack to cleanup with 0 i.e. 1468 * the tcb is not going away. 1469 */ 1470 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1471 } 1472 refcount_release(&tp->t_fb->tfb_refcnt); 1473 tp->t_fb = blk; 1474 if (tp->t_fb->tfb_tcp_fb_init) { 1475 (*tp->t_fb->tfb_tcp_fb_init)(tp); 1476 } 1477 #ifdef TCP_OFFLOAD 1478 if (tp->t_flags & TF_TOE) { 1479 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1480 sopt->sopt_name); 1481 } 1482 #endif 1483 INP_WUNLOCK(inp); 1484 return (error); 1485 } else if ((sopt->sopt_dir == SOPT_GET) && 1486 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1487 strcpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name); 1488 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1489 INP_WUNLOCK(inp); 1490 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1491 return (error); 1492 } 1493 /* Pass in the INP locked, called must unlock it */ 1494 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1495 } 1496 1497 int 1498 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1499 { 1500 int error, opt, optval; 1501 u_int ui; 1502 struct tcp_info ti; 1503 struct cc_algo *algo; 1504 char *pbuf, buf[TCP_CA_NAME_MAX]; 1505 size_t len; 1506 1507 /* 1508 * For TCP_CCALGOOPT forward the control to CC module, for both 1509 * SOPT_SET and SOPT_GET. 1510 */ 1511 switch (sopt->sopt_name) { 1512 case TCP_CCALGOOPT: 1513 INP_WUNLOCK(inp); 1514 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1515 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1516 sopt->sopt_valsize); 1517 if (error) { 1518 free(pbuf, M_TEMP); 1519 return (error); 1520 } 1521 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1522 if (CC_ALGO(tp)->ctl_output != NULL) 1523 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1524 else 1525 error = ENOENT; 1526 INP_WUNLOCK(inp); 1527 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1528 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1529 free(pbuf, M_TEMP); 1530 return (error); 1531 } 1532 1533 switch (sopt->sopt_dir) { 1534 case SOPT_SET: 1535 switch (sopt->sopt_name) { 1536 #ifdef TCP_SIGNATURE 1537 case TCP_MD5SIG: 1538 INP_WUNLOCK(inp); 1539 error = sooptcopyin(sopt, &optval, sizeof optval, 1540 sizeof optval); 1541 if (error) 1542 return (error); 1543 1544 INP_WLOCK_RECHECK(inp); 1545 if (optval > 0) 1546 tp->t_flags |= TF_SIGNATURE; 1547 else 1548 tp->t_flags &= ~TF_SIGNATURE; 1549 goto unlock_and_done; 1550 #endif /* TCP_SIGNATURE */ 1551 1552 case TCP_NODELAY: 1553 case TCP_NOOPT: 1554 INP_WUNLOCK(inp); 1555 error = sooptcopyin(sopt, &optval, sizeof optval, 1556 sizeof optval); 1557 if (error) 1558 return (error); 1559 1560 INP_WLOCK_RECHECK(inp); 1561 switch (sopt->sopt_name) { 1562 case TCP_NODELAY: 1563 opt = TF_NODELAY; 1564 break; 1565 case TCP_NOOPT: 1566 opt = TF_NOOPT; 1567 break; 1568 default: 1569 opt = 0; /* dead code to fool gcc */ 1570 break; 1571 } 1572 1573 if (optval) 1574 tp->t_flags |= opt; 1575 else 1576 tp->t_flags &= ~opt; 1577 unlock_and_done: 1578 #ifdef TCP_OFFLOAD 1579 if (tp->t_flags & TF_TOE) { 1580 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1581 sopt->sopt_name); 1582 } 1583 #endif 1584 INP_WUNLOCK(inp); 1585 break; 1586 1587 case TCP_NOPUSH: 1588 INP_WUNLOCK(inp); 1589 error = sooptcopyin(sopt, &optval, sizeof optval, 1590 sizeof optval); 1591 if (error) 1592 return (error); 1593 1594 INP_WLOCK_RECHECK(inp); 1595 if (optval) 1596 tp->t_flags |= TF_NOPUSH; 1597 else if (tp->t_flags & TF_NOPUSH) { 1598 tp->t_flags &= ~TF_NOPUSH; 1599 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1600 error = tp->t_fb->tfb_tcp_output(tp); 1601 } 1602 goto unlock_and_done; 1603 1604 case TCP_MAXSEG: 1605 INP_WUNLOCK(inp); 1606 error = sooptcopyin(sopt, &optval, sizeof optval, 1607 sizeof optval); 1608 if (error) 1609 return (error); 1610 1611 INP_WLOCK_RECHECK(inp); 1612 if (optval > 0 && optval <= tp->t_maxseg && 1613 optval + 40 >= V_tcp_minmss) 1614 tp->t_maxseg = optval; 1615 else 1616 error = EINVAL; 1617 goto unlock_and_done; 1618 1619 case TCP_INFO: 1620 INP_WUNLOCK(inp); 1621 error = EINVAL; 1622 break; 1623 1624 case TCP_CONGESTION: 1625 INP_WUNLOCK(inp); 1626 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1627 if (error) 1628 break; 1629 buf[sopt->sopt_valsize] = '\0'; 1630 INP_WLOCK_RECHECK(inp); 1631 CC_LIST_RLOCK(); 1632 STAILQ_FOREACH(algo, &cc_list, entries) 1633 if (strncmp(buf, algo->name, 1634 TCP_CA_NAME_MAX) == 0) 1635 break; 1636 CC_LIST_RUNLOCK(); 1637 if (algo == NULL) { 1638 INP_WUNLOCK(inp); 1639 error = EINVAL; 1640 break; 1641 } 1642 /* 1643 * We hold a write lock over the tcb so it's safe to 1644 * do these things without ordering concerns. 1645 */ 1646 if (CC_ALGO(tp)->cb_destroy != NULL) 1647 CC_ALGO(tp)->cb_destroy(tp->ccv); 1648 CC_ALGO(tp) = algo; 1649 /* 1650 * If something goes pear shaped initialising the new 1651 * algo, fall back to newreno (which does not 1652 * require initialisation). 1653 */ 1654 if (algo->cb_init != NULL && 1655 algo->cb_init(tp->ccv) != 0) { 1656 CC_ALGO(tp) = &newreno_cc_algo; 1657 /* 1658 * The only reason init should fail is 1659 * because of malloc. 1660 */ 1661 error = ENOMEM; 1662 } 1663 INP_WUNLOCK(inp); 1664 break; 1665 1666 case TCP_KEEPIDLE: 1667 case TCP_KEEPINTVL: 1668 case TCP_KEEPINIT: 1669 INP_WUNLOCK(inp); 1670 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1671 if (error) 1672 return (error); 1673 1674 if (ui > (UINT_MAX / hz)) { 1675 error = EINVAL; 1676 break; 1677 } 1678 ui *= hz; 1679 1680 INP_WLOCK_RECHECK(inp); 1681 switch (sopt->sopt_name) { 1682 case TCP_KEEPIDLE: 1683 tp->t_keepidle = ui; 1684 /* 1685 * XXX: better check current remaining 1686 * timeout and "merge" it with new value. 1687 */ 1688 if ((tp->t_state > TCPS_LISTEN) && 1689 (tp->t_state <= TCPS_CLOSING)) 1690 tcp_timer_activate(tp, TT_KEEP, 1691 TP_KEEPIDLE(tp)); 1692 break; 1693 case TCP_KEEPINTVL: 1694 tp->t_keepintvl = ui; 1695 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1696 (TP_MAXIDLE(tp) > 0)) 1697 tcp_timer_activate(tp, TT_2MSL, 1698 TP_MAXIDLE(tp)); 1699 break; 1700 case TCP_KEEPINIT: 1701 tp->t_keepinit = ui; 1702 if (tp->t_state == TCPS_SYN_RECEIVED || 1703 tp->t_state == TCPS_SYN_SENT) 1704 tcp_timer_activate(tp, TT_KEEP, 1705 TP_KEEPINIT(tp)); 1706 break; 1707 } 1708 goto unlock_and_done; 1709 1710 case TCP_KEEPCNT: 1711 INP_WUNLOCK(inp); 1712 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1713 if (error) 1714 return (error); 1715 1716 INP_WLOCK_RECHECK(inp); 1717 tp->t_keepcnt = ui; 1718 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1719 (TP_MAXIDLE(tp) > 0)) 1720 tcp_timer_activate(tp, TT_2MSL, 1721 TP_MAXIDLE(tp)); 1722 goto unlock_and_done; 1723 1724 #ifdef TCPPCAP 1725 case TCP_PCAP_OUT: 1726 case TCP_PCAP_IN: 1727 INP_WUNLOCK(inp); 1728 error = sooptcopyin(sopt, &optval, sizeof optval, 1729 sizeof optval); 1730 if (error) 1731 return (error); 1732 1733 INP_WLOCK_RECHECK(inp); 1734 if (optval >= 0) 1735 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1736 &(tp->t_outpkts) : &(tp->t_inpkts), 1737 optval); 1738 else 1739 error = EINVAL; 1740 goto unlock_and_done; 1741 #endif 1742 1743 #ifdef TCP_RFC7413 1744 case TCP_FASTOPEN: 1745 INP_WUNLOCK(inp); 1746 if (!V_tcp_fastopen_enabled) 1747 return (EPERM); 1748 1749 error = sooptcopyin(sopt, &optval, sizeof optval, 1750 sizeof optval); 1751 if (error) 1752 return (error); 1753 1754 INP_WLOCK_RECHECK(inp); 1755 if (optval) { 1756 tp->t_flags |= TF_FASTOPEN; 1757 if ((tp->t_state == TCPS_LISTEN) && 1758 (tp->t_tfo_pending == NULL)) 1759 tp->t_tfo_pending = 1760 tcp_fastopen_alloc_counter(); 1761 } else 1762 tp->t_flags &= ~TF_FASTOPEN; 1763 goto unlock_and_done; 1764 #endif 1765 1766 default: 1767 INP_WUNLOCK(inp); 1768 error = ENOPROTOOPT; 1769 break; 1770 } 1771 break; 1772 1773 case SOPT_GET: 1774 tp = intotcpcb(inp); 1775 switch (sopt->sopt_name) { 1776 #ifdef TCP_SIGNATURE 1777 case TCP_MD5SIG: 1778 optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; 1779 INP_WUNLOCK(inp); 1780 error = sooptcopyout(sopt, &optval, sizeof optval); 1781 break; 1782 #endif 1783 1784 case TCP_NODELAY: 1785 optval = tp->t_flags & TF_NODELAY; 1786 INP_WUNLOCK(inp); 1787 error = sooptcopyout(sopt, &optval, sizeof optval); 1788 break; 1789 case TCP_MAXSEG: 1790 optval = tp->t_maxseg; 1791 INP_WUNLOCK(inp); 1792 error = sooptcopyout(sopt, &optval, sizeof optval); 1793 break; 1794 case TCP_NOOPT: 1795 optval = tp->t_flags & TF_NOOPT; 1796 INP_WUNLOCK(inp); 1797 error = sooptcopyout(sopt, &optval, sizeof optval); 1798 break; 1799 case TCP_NOPUSH: 1800 optval = tp->t_flags & TF_NOPUSH; 1801 INP_WUNLOCK(inp); 1802 error = sooptcopyout(sopt, &optval, sizeof optval); 1803 break; 1804 case TCP_INFO: 1805 tcp_fill_info(tp, &ti); 1806 INP_WUNLOCK(inp); 1807 error = sooptcopyout(sopt, &ti, sizeof ti); 1808 break; 1809 case TCP_CONGESTION: 1810 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1811 INP_WUNLOCK(inp); 1812 error = sooptcopyout(sopt, buf, len + 1); 1813 break; 1814 case TCP_KEEPIDLE: 1815 case TCP_KEEPINTVL: 1816 case TCP_KEEPINIT: 1817 case TCP_KEEPCNT: 1818 switch (sopt->sopt_name) { 1819 case TCP_KEEPIDLE: 1820 ui = tp->t_keepidle / hz; 1821 break; 1822 case TCP_KEEPINTVL: 1823 ui = tp->t_keepintvl / hz; 1824 break; 1825 case TCP_KEEPINIT: 1826 ui = tp->t_keepinit / hz; 1827 break; 1828 case TCP_KEEPCNT: 1829 ui = tp->t_keepcnt; 1830 break; 1831 } 1832 INP_WUNLOCK(inp); 1833 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1834 break; 1835 #ifdef TCPPCAP 1836 case TCP_PCAP_OUT: 1837 case TCP_PCAP_IN: 1838 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1839 &(tp->t_outpkts) : &(tp->t_inpkts)); 1840 INP_WUNLOCK(inp); 1841 error = sooptcopyout(sopt, &optval, sizeof optval); 1842 break; 1843 #endif 1844 1845 #ifdef TCP_RFC7413 1846 case TCP_FASTOPEN: 1847 optval = tp->t_flags & TF_FASTOPEN; 1848 INP_WUNLOCK(inp); 1849 error = sooptcopyout(sopt, &optval, sizeof optval); 1850 break; 1851 #endif 1852 default: 1853 INP_WUNLOCK(inp); 1854 error = ENOPROTOOPT; 1855 break; 1856 } 1857 break; 1858 } 1859 return (error); 1860 } 1861 #undef INP_WLOCK_RECHECK 1862 #undef INP_WLOCK_RECHECK_CLEANUP 1863 1864 /* 1865 * Attach TCP protocol to socket, allocating 1866 * internet protocol control block, tcp control block, 1867 * bufer space, and entering LISTEN state if to accept connections. 1868 */ 1869 static int 1870 tcp_attach(struct socket *so) 1871 { 1872 struct tcpcb *tp; 1873 struct inpcb *inp; 1874 int error; 1875 1876 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1877 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1878 if (error) 1879 return (error); 1880 } 1881 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1882 so->so_snd.sb_flags |= SB_AUTOSIZE; 1883 INP_INFO_RLOCK(&V_tcbinfo); 1884 error = in_pcballoc(so, &V_tcbinfo); 1885 if (error) { 1886 INP_INFO_RUNLOCK(&V_tcbinfo); 1887 return (error); 1888 } 1889 inp = sotoinpcb(so); 1890 #ifdef INET6 1891 if (inp->inp_vflag & INP_IPV6PROTO) { 1892 inp->inp_vflag |= INP_IPV6; 1893 inp->in6p_hops = -1; /* use kernel default */ 1894 } 1895 else 1896 #endif 1897 inp->inp_vflag |= INP_IPV4; 1898 tp = tcp_newtcpcb(inp); 1899 if (tp == NULL) { 1900 in_pcbdetach(inp); 1901 in_pcbfree(inp); 1902 INP_INFO_RUNLOCK(&V_tcbinfo); 1903 return (ENOBUFS); 1904 } 1905 tp->t_state = TCPS_CLOSED; 1906 INP_WUNLOCK(inp); 1907 INP_INFO_RUNLOCK(&V_tcbinfo); 1908 TCPSTATES_INC(TCPS_CLOSED); 1909 return (0); 1910 } 1911 1912 /* 1913 * Initiate (or continue) disconnect. 1914 * If embryonic state, just send reset (once). 1915 * If in ``let data drain'' option and linger null, just drop. 1916 * Otherwise (hard), mark socket disconnecting and drop 1917 * current input data; switch states based on user close, and 1918 * send segment to peer (with FIN). 1919 */ 1920 static void 1921 tcp_disconnect(struct tcpcb *tp) 1922 { 1923 struct inpcb *inp = tp->t_inpcb; 1924 struct socket *so = inp->inp_socket; 1925 1926 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1927 INP_WLOCK_ASSERT(inp); 1928 1929 /* 1930 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1931 * socket is still open. 1932 */ 1933 if (tp->t_state < TCPS_ESTABLISHED) { 1934 tp = tcp_close(tp); 1935 KASSERT(tp != NULL, 1936 ("tcp_disconnect: tcp_close() returned NULL")); 1937 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1938 tp = tcp_drop(tp, 0); 1939 KASSERT(tp != NULL, 1940 ("tcp_disconnect: tcp_drop() returned NULL")); 1941 } else { 1942 soisdisconnecting(so); 1943 sbflush(&so->so_rcv); 1944 tcp_usrclosed(tp); 1945 if (!(inp->inp_flags & INP_DROPPED)) 1946 tp->t_fb->tfb_tcp_output(tp); 1947 } 1948 } 1949 1950 /* 1951 * User issued close, and wish to trail through shutdown states: 1952 * if never received SYN, just forget it. If got a SYN from peer, 1953 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1954 * If already got a FIN from peer, then almost done; go to LAST_ACK 1955 * state. In all other cases, have already sent FIN to peer (e.g. 1956 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1957 * for peer to send FIN or not respond to keep-alives, etc. 1958 * We can let the user exit from the close as soon as the FIN is acked. 1959 */ 1960 static void 1961 tcp_usrclosed(struct tcpcb *tp) 1962 { 1963 1964 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1965 INP_WLOCK_ASSERT(tp->t_inpcb); 1966 1967 switch (tp->t_state) { 1968 case TCPS_LISTEN: 1969 #ifdef TCP_OFFLOAD 1970 tcp_offload_listen_stop(tp); 1971 #endif 1972 tcp_state_change(tp, TCPS_CLOSED); 1973 /* FALLTHROUGH */ 1974 case TCPS_CLOSED: 1975 tp = tcp_close(tp); 1976 /* 1977 * tcp_close() should never return NULL here as the socket is 1978 * still open. 1979 */ 1980 KASSERT(tp != NULL, 1981 ("tcp_usrclosed: tcp_close() returned NULL")); 1982 break; 1983 1984 case TCPS_SYN_SENT: 1985 case TCPS_SYN_RECEIVED: 1986 tp->t_flags |= TF_NEEDFIN; 1987 break; 1988 1989 case TCPS_ESTABLISHED: 1990 tcp_state_change(tp, TCPS_FIN_WAIT_1); 1991 break; 1992 1993 case TCPS_CLOSE_WAIT: 1994 tcp_state_change(tp, TCPS_LAST_ACK); 1995 break; 1996 } 1997 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1998 soisdisconnected(tp->t_inpcb->inp_socket); 1999 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2000 if (tp->t_state == TCPS_FIN_WAIT_2) { 2001 int timeout; 2002 2003 timeout = (tcp_fast_finwait2_recycle) ? 2004 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2005 tcp_timer_activate(tp, TT_2MSL, timeout); 2006 } 2007 } 2008 } 2009 2010 #ifdef DDB 2011 static void 2012 db_print_indent(int indent) 2013 { 2014 int i; 2015 2016 for (i = 0; i < indent; i++) 2017 db_printf(" "); 2018 } 2019 2020 static void 2021 db_print_tstate(int t_state) 2022 { 2023 2024 switch (t_state) { 2025 case TCPS_CLOSED: 2026 db_printf("TCPS_CLOSED"); 2027 return; 2028 2029 case TCPS_LISTEN: 2030 db_printf("TCPS_LISTEN"); 2031 return; 2032 2033 case TCPS_SYN_SENT: 2034 db_printf("TCPS_SYN_SENT"); 2035 return; 2036 2037 case TCPS_SYN_RECEIVED: 2038 db_printf("TCPS_SYN_RECEIVED"); 2039 return; 2040 2041 case TCPS_ESTABLISHED: 2042 db_printf("TCPS_ESTABLISHED"); 2043 return; 2044 2045 case TCPS_CLOSE_WAIT: 2046 db_printf("TCPS_CLOSE_WAIT"); 2047 return; 2048 2049 case TCPS_FIN_WAIT_1: 2050 db_printf("TCPS_FIN_WAIT_1"); 2051 return; 2052 2053 case TCPS_CLOSING: 2054 db_printf("TCPS_CLOSING"); 2055 return; 2056 2057 case TCPS_LAST_ACK: 2058 db_printf("TCPS_LAST_ACK"); 2059 return; 2060 2061 case TCPS_FIN_WAIT_2: 2062 db_printf("TCPS_FIN_WAIT_2"); 2063 return; 2064 2065 case TCPS_TIME_WAIT: 2066 db_printf("TCPS_TIME_WAIT"); 2067 return; 2068 2069 default: 2070 db_printf("unknown"); 2071 return; 2072 } 2073 } 2074 2075 static void 2076 db_print_tflags(u_int t_flags) 2077 { 2078 int comma; 2079 2080 comma = 0; 2081 if (t_flags & TF_ACKNOW) { 2082 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2083 comma = 1; 2084 } 2085 if (t_flags & TF_DELACK) { 2086 db_printf("%sTF_DELACK", comma ? ", " : ""); 2087 comma = 1; 2088 } 2089 if (t_flags & TF_NODELAY) { 2090 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2091 comma = 1; 2092 } 2093 if (t_flags & TF_NOOPT) { 2094 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2095 comma = 1; 2096 } 2097 if (t_flags & TF_SENTFIN) { 2098 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2099 comma = 1; 2100 } 2101 if (t_flags & TF_REQ_SCALE) { 2102 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2103 comma = 1; 2104 } 2105 if (t_flags & TF_RCVD_SCALE) { 2106 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2107 comma = 1; 2108 } 2109 if (t_flags & TF_REQ_TSTMP) { 2110 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2111 comma = 1; 2112 } 2113 if (t_flags & TF_RCVD_TSTMP) { 2114 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2115 comma = 1; 2116 } 2117 if (t_flags & TF_SACK_PERMIT) { 2118 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2119 comma = 1; 2120 } 2121 if (t_flags & TF_NEEDSYN) { 2122 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2123 comma = 1; 2124 } 2125 if (t_flags & TF_NEEDFIN) { 2126 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2127 comma = 1; 2128 } 2129 if (t_flags & TF_NOPUSH) { 2130 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2131 comma = 1; 2132 } 2133 if (t_flags & TF_MORETOCOME) { 2134 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2135 comma = 1; 2136 } 2137 if (t_flags & TF_LQ_OVERFLOW) { 2138 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2139 comma = 1; 2140 } 2141 if (t_flags & TF_LASTIDLE) { 2142 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2143 comma = 1; 2144 } 2145 if (t_flags & TF_RXWIN0SENT) { 2146 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2147 comma = 1; 2148 } 2149 if (t_flags & TF_FASTRECOVERY) { 2150 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2151 comma = 1; 2152 } 2153 if (t_flags & TF_CONGRECOVERY) { 2154 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2155 comma = 1; 2156 } 2157 if (t_flags & TF_WASFRECOVERY) { 2158 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2159 comma = 1; 2160 } 2161 if (t_flags & TF_SIGNATURE) { 2162 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2163 comma = 1; 2164 } 2165 if (t_flags & TF_FORCEDATA) { 2166 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2167 comma = 1; 2168 } 2169 if (t_flags & TF_TSO) { 2170 db_printf("%sTF_TSO", comma ? ", " : ""); 2171 comma = 1; 2172 } 2173 if (t_flags & TF_ECN_PERMIT) { 2174 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2175 comma = 1; 2176 } 2177 if (t_flags & TF_FASTOPEN) { 2178 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2179 comma = 1; 2180 } 2181 } 2182 2183 static void 2184 db_print_toobflags(char t_oobflags) 2185 { 2186 int comma; 2187 2188 comma = 0; 2189 if (t_oobflags & TCPOOB_HAVEDATA) { 2190 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2191 comma = 1; 2192 } 2193 if (t_oobflags & TCPOOB_HADDATA) { 2194 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2195 comma = 1; 2196 } 2197 } 2198 2199 static void 2200 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2201 { 2202 2203 db_print_indent(indent); 2204 db_printf("%s at %p\n", name, tp); 2205 2206 indent += 2; 2207 2208 db_print_indent(indent); 2209 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2210 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2211 2212 db_print_indent(indent); 2213 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2214 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2215 2216 db_print_indent(indent); 2217 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2218 &tp->t_timers->tt_delack, tp->t_inpcb); 2219 2220 db_print_indent(indent); 2221 db_printf("t_state: %d (", tp->t_state); 2222 db_print_tstate(tp->t_state); 2223 db_printf(")\n"); 2224 2225 db_print_indent(indent); 2226 db_printf("t_flags: 0x%x (", tp->t_flags); 2227 db_print_tflags(tp->t_flags); 2228 db_printf(")\n"); 2229 2230 db_print_indent(indent); 2231 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2232 tp->snd_una, tp->snd_max, tp->snd_nxt); 2233 2234 db_print_indent(indent); 2235 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2236 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2237 2238 db_print_indent(indent); 2239 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2240 tp->iss, tp->irs, tp->rcv_nxt); 2241 2242 db_print_indent(indent); 2243 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2244 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2245 2246 db_print_indent(indent); 2247 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2248 tp->snd_wnd, tp->snd_cwnd); 2249 2250 db_print_indent(indent); 2251 db_printf("snd_ssthresh: %lu snd_recover: " 2252 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2253 2254 db_print_indent(indent); 2255 db_printf("t_rcvtime: %u t_startime: %u\n", 2256 tp->t_rcvtime, tp->t_starttime); 2257 2258 db_print_indent(indent); 2259 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2260 tp->t_rtttime, tp->t_rtseq); 2261 2262 db_print_indent(indent); 2263 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2264 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2265 2266 db_print_indent(indent); 2267 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2268 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2269 tp->t_rttbest); 2270 2271 db_print_indent(indent); 2272 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2273 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2274 2275 db_print_indent(indent); 2276 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2277 db_print_toobflags(tp->t_oobflags); 2278 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2279 2280 db_print_indent(indent); 2281 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2282 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2283 2284 db_print_indent(indent); 2285 db_printf("ts_recent: %u ts_recent_age: %u\n", 2286 tp->ts_recent, tp->ts_recent_age); 2287 2288 db_print_indent(indent); 2289 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2290 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2291 2292 db_print_indent(indent); 2293 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2294 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2295 tp->snd_recover_prev, tp->t_badrxtwin); 2296 2297 db_print_indent(indent); 2298 db_printf("snd_numholes: %d snd_holes first: %p\n", 2299 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2300 2301 db_print_indent(indent); 2302 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2303 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2304 2305 /* Skip sackblks, sackhint. */ 2306 2307 db_print_indent(indent); 2308 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2309 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2310 } 2311 2312 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2313 { 2314 struct tcpcb *tp; 2315 2316 if (!have_addr) { 2317 db_printf("usage: show tcpcb <addr>\n"); 2318 return; 2319 } 2320 tp = (struct tcpcb *)addr; 2321 2322 db_print_tcpcb(tp, "tcpcb", 0); 2323 } 2324 #endif 2325