1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. 6 * Copyright (c) 2006-2007 Robert N. M. Watson 7 * Copyright (c) 2010-2011 Juniper Networks, Inc. 8 * All rights reserved. 9 * 10 * Portions of this software were developed by Robert N. M. Watson under 11 * contract to Juniper Networks, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_ddb.h" 44 #include "opt_inet.h" 45 #include "opt_inet6.h" 46 #include "opt_ipsec.h" 47 #include "opt_tcpdebug.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/limits.h> 52 #include <sys/malloc.h> 53 #include <sys/refcount.h> 54 #include <sys/kernel.h> 55 #include <sys/sysctl.h> 56 #include <sys/mbuf.h> 57 #ifdef INET6 58 #include <sys/domain.h> 59 #endif /* INET6 */ 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/protosw.h> 63 #include <sys/proc.h> 64 #include <sys/jail.h> 65 #include <sys/syslog.h> 66 67 #ifdef DDB 68 #include <ddb/ddb.h> 69 #endif 70 71 #include <net/if.h> 72 #include <net/if_var.h> 73 #include <net/route.h> 74 #include <net/vnet.h> 75 76 #include <netinet/in.h> 77 #include <netinet/in_kdtrace.h> 78 #include <netinet/in_pcb.h> 79 #include <netinet/in_systm.h> 80 #include <netinet/in_var.h> 81 #include <netinet/ip_var.h> 82 #ifdef INET6 83 #include <netinet/ip6.h> 84 #include <netinet6/in6_pcb.h> 85 #include <netinet6/ip6_var.h> 86 #include <netinet6/scope6_var.h> 87 #endif 88 #include <netinet/tcp.h> 89 #include <netinet/tcp_fsm.h> 90 #include <netinet/tcp_seq.h> 91 #include <netinet/tcp_timer.h> 92 #include <netinet/tcp_var.h> 93 #include <netinet/tcpip.h> 94 #include <netinet/cc/cc.h> 95 #include <netinet/tcp_fastopen.h> 96 #ifdef TCPPCAP 97 #include <netinet/tcp_pcap.h> 98 #endif 99 #ifdef TCPDEBUG 100 #include <netinet/tcp_debug.h> 101 #endif 102 #ifdef TCP_OFFLOAD 103 #include <netinet/tcp_offload.h> 104 #endif 105 #include <netipsec/ipsec_support.h> 106 107 /* 108 * TCP protocol interface to socket abstraction. 109 */ 110 static int tcp_attach(struct socket *); 111 #ifdef INET 112 static int tcp_connect(struct tcpcb *, struct sockaddr *, 113 struct thread *td); 114 #endif /* INET */ 115 #ifdef INET6 116 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 117 struct thread *td); 118 #endif /* INET6 */ 119 static void tcp_disconnect(struct tcpcb *); 120 static void tcp_usrclosed(struct tcpcb *); 121 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 122 123 #ifdef TCPDEBUG 124 #define TCPDEBUG0 int ostate = 0 125 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 126 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 127 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 128 #else 129 #define TCPDEBUG0 130 #define TCPDEBUG1() 131 #define TCPDEBUG2(req) 132 #endif 133 134 /* 135 * TCP attaches to socket via pru_attach(), reserving space, 136 * and an internet control block. 137 */ 138 static int 139 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 140 { 141 struct inpcb *inp; 142 struct tcpcb *tp = NULL; 143 int error; 144 TCPDEBUG0; 145 146 inp = sotoinpcb(so); 147 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 148 TCPDEBUG1(); 149 150 error = tcp_attach(so); 151 if (error) 152 goto out; 153 154 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 155 so->so_linger = TCP_LINGERTIME; 156 157 inp = sotoinpcb(so); 158 tp = intotcpcb(inp); 159 out: 160 TCPDEBUG2(PRU_ATTACH); 161 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 162 return error; 163 } 164 165 /* 166 * tcp_detach is called when the socket layer loses its final reference 167 * to the socket, be it a file descriptor reference, a reference from TCP, 168 * etc. At this point, there is only one case in which we will keep around 169 * inpcb state: time wait. 170 * 171 * This function can probably be re-absorbed back into tcp_usr_detach() now 172 * that there is a single detach path. 173 */ 174 static void 175 tcp_detach(struct socket *so, struct inpcb *inp) 176 { 177 struct tcpcb *tp; 178 179 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 180 INP_WLOCK_ASSERT(inp); 181 182 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 183 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 184 185 tp = intotcpcb(inp); 186 187 if (inp->inp_flags & INP_TIMEWAIT) { 188 /* 189 * There are two cases to handle: one in which the time wait 190 * state is being discarded (INP_DROPPED), and one in which 191 * this connection will remain in timewait. In the former, 192 * it is time to discard all state (except tcptw, which has 193 * already been discarded by the timewait close code, which 194 * should be further up the call stack somewhere). In the 195 * latter case, we detach from the socket, but leave the pcb 196 * present until timewait ends. 197 * 198 * XXXRW: Would it be cleaner to free the tcptw here? 199 * 200 * Astute question indeed, from twtcp perspective there are 201 * three cases to consider: 202 * 203 * #1 tcp_detach is called at tcptw creation time by 204 * tcp_twstart, then do not discard the newly created tcptw 205 * and leave inpcb present until timewait ends 206 * #2 tcp_detach is called at timewait end (or reuse) by 207 * tcp_twclose, then the tcptw has already been discarded 208 * (or reused) and inpcb is freed here 209 * #3 tcp_detach is called() after timewait ends (or reuse) 210 * (e.g. by soclose), then tcptw has already been discarded 211 * (or reused) and inpcb is freed here 212 * 213 * In all three cases the tcptw should not be freed here. 214 */ 215 if (inp->inp_flags & INP_DROPPED) { 216 in_pcbdetach(inp); 217 if (__predict_true(tp == NULL)) { 218 in_pcbfree(inp); 219 } else { 220 /* 221 * This case should not happen as in TIMEWAIT 222 * state the inp should not be destroyed before 223 * its tcptw. If INVARIANTS is defined, panic. 224 */ 225 #ifdef INVARIANTS 226 panic("%s: Panic before an inp double-free: " 227 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 228 , __func__); 229 #else 230 log(LOG_ERR, "%s: Avoid an inp double-free: " 231 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 232 , __func__); 233 #endif 234 INP_WUNLOCK(inp); 235 } 236 } else { 237 in_pcbdetach(inp); 238 INP_WUNLOCK(inp); 239 } 240 } else { 241 /* 242 * If the connection is not in timewait, we consider two 243 * two conditions: one in which no further processing is 244 * necessary (dropped || embryonic), and one in which TCP is 245 * not yet done, but no longer requires the socket, so the 246 * pcb will persist for the time being. 247 * 248 * XXXRW: Does the second case still occur? 249 */ 250 if (inp->inp_flags & INP_DROPPED || 251 tp->t_state < TCPS_SYN_SENT) { 252 tcp_discardcb(tp); 253 in_pcbdetach(inp); 254 in_pcbfree(inp); 255 } else { 256 in_pcbdetach(inp); 257 INP_WUNLOCK(inp); 258 } 259 } 260 } 261 262 /* 263 * pru_detach() detaches the TCP protocol from the socket. 264 * If the protocol state is non-embryonic, then can't 265 * do this directly: have to initiate a pru_disconnect(), 266 * which may finish later; embryonic TCB's can just 267 * be discarded here. 268 */ 269 static void 270 tcp_usr_detach(struct socket *so) 271 { 272 struct inpcb *inp; 273 int rlock = 0; 274 275 inp = sotoinpcb(so); 276 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 277 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 278 INP_INFO_RLOCK(&V_tcbinfo); 279 rlock = 1; 280 } 281 INP_WLOCK(inp); 282 KASSERT(inp->inp_socket != NULL, 283 ("tcp_usr_detach: inp_socket == NULL")); 284 tcp_detach(so, inp); 285 if (rlock) 286 INP_INFO_RUNLOCK(&V_tcbinfo); 287 } 288 289 #ifdef INET 290 /* 291 * Give the socket an address. 292 */ 293 static int 294 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 295 { 296 int error = 0; 297 struct inpcb *inp; 298 struct tcpcb *tp = NULL; 299 struct sockaddr_in *sinp; 300 301 sinp = (struct sockaddr_in *)nam; 302 if (nam->sa_len != sizeof (*sinp)) 303 return (EINVAL); 304 /* 305 * Must check for multicast addresses and disallow binding 306 * to them. 307 */ 308 if (sinp->sin_family == AF_INET && 309 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 310 return (EAFNOSUPPORT); 311 312 TCPDEBUG0; 313 inp = sotoinpcb(so); 314 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 315 INP_WLOCK(inp); 316 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 317 error = EINVAL; 318 goto out; 319 } 320 tp = intotcpcb(inp); 321 TCPDEBUG1(); 322 INP_HASH_WLOCK(&V_tcbinfo); 323 error = in_pcbbind(inp, nam, td->td_ucred); 324 INP_HASH_WUNLOCK(&V_tcbinfo); 325 out: 326 TCPDEBUG2(PRU_BIND); 327 TCP_PROBE2(debug__user, tp, PRU_BIND); 328 INP_WUNLOCK(inp); 329 330 return (error); 331 } 332 #endif /* INET */ 333 334 #ifdef INET6 335 static int 336 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 337 { 338 int error = 0; 339 struct inpcb *inp; 340 struct tcpcb *tp = NULL; 341 struct sockaddr_in6 *sin6p; 342 343 sin6p = (struct sockaddr_in6 *)nam; 344 if (nam->sa_len != sizeof (*sin6p)) 345 return (EINVAL); 346 /* 347 * Must check for multicast addresses and disallow binding 348 * to them. 349 */ 350 if (sin6p->sin6_family == AF_INET6 && 351 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 352 return (EAFNOSUPPORT); 353 354 TCPDEBUG0; 355 inp = sotoinpcb(so); 356 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 357 INP_WLOCK(inp); 358 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 359 error = EINVAL; 360 goto out; 361 } 362 tp = intotcpcb(inp); 363 TCPDEBUG1(); 364 INP_HASH_WLOCK(&V_tcbinfo); 365 inp->inp_vflag &= ~INP_IPV4; 366 inp->inp_vflag |= INP_IPV6; 367 #ifdef INET 368 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 369 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 370 inp->inp_vflag |= INP_IPV4; 371 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 372 struct sockaddr_in sin; 373 374 in6_sin6_2_sin(&sin, sin6p); 375 inp->inp_vflag |= INP_IPV4; 376 inp->inp_vflag &= ~INP_IPV6; 377 error = in_pcbbind(inp, (struct sockaddr *)&sin, 378 td->td_ucred); 379 INP_HASH_WUNLOCK(&V_tcbinfo); 380 goto out; 381 } 382 } 383 #endif 384 error = in6_pcbbind(inp, nam, td->td_ucred); 385 INP_HASH_WUNLOCK(&V_tcbinfo); 386 out: 387 TCPDEBUG2(PRU_BIND); 388 TCP_PROBE2(debug__user, tp, PRU_BIND); 389 INP_WUNLOCK(inp); 390 return (error); 391 } 392 #endif /* INET6 */ 393 394 #ifdef INET 395 /* 396 * Prepare to accept connections. 397 */ 398 static int 399 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 400 { 401 int error = 0; 402 struct inpcb *inp; 403 struct tcpcb *tp = NULL; 404 405 TCPDEBUG0; 406 inp = sotoinpcb(so); 407 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 408 INP_WLOCK(inp); 409 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 410 error = EINVAL; 411 goto out; 412 } 413 tp = intotcpcb(inp); 414 TCPDEBUG1(); 415 SOCK_LOCK(so); 416 error = solisten_proto_check(so); 417 INP_HASH_WLOCK(&V_tcbinfo); 418 if (error == 0 && inp->inp_lport == 0) 419 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 420 INP_HASH_WUNLOCK(&V_tcbinfo); 421 if (error == 0) { 422 tcp_state_change(tp, TCPS_LISTEN); 423 solisten_proto(so, backlog); 424 #ifdef TCP_OFFLOAD 425 if ((so->so_options & SO_NO_OFFLOAD) == 0) 426 tcp_offload_listen_start(tp); 427 #endif 428 } 429 SOCK_UNLOCK(so); 430 431 if (IS_FASTOPEN(tp->t_flags)) 432 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 433 434 out: 435 TCPDEBUG2(PRU_LISTEN); 436 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 437 INP_WUNLOCK(inp); 438 return (error); 439 } 440 #endif /* INET */ 441 442 #ifdef INET6 443 static int 444 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 445 { 446 int error = 0; 447 struct inpcb *inp; 448 struct tcpcb *tp = NULL; 449 450 TCPDEBUG0; 451 inp = sotoinpcb(so); 452 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 453 INP_WLOCK(inp); 454 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 455 error = EINVAL; 456 goto out; 457 } 458 tp = intotcpcb(inp); 459 TCPDEBUG1(); 460 SOCK_LOCK(so); 461 error = solisten_proto_check(so); 462 INP_HASH_WLOCK(&V_tcbinfo); 463 if (error == 0 && inp->inp_lport == 0) { 464 inp->inp_vflag &= ~INP_IPV4; 465 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 466 inp->inp_vflag |= INP_IPV4; 467 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 468 } 469 INP_HASH_WUNLOCK(&V_tcbinfo); 470 if (error == 0) { 471 tcp_state_change(tp, TCPS_LISTEN); 472 solisten_proto(so, backlog); 473 #ifdef TCP_OFFLOAD 474 if ((so->so_options & SO_NO_OFFLOAD) == 0) 475 tcp_offload_listen_start(tp); 476 #endif 477 } 478 SOCK_UNLOCK(so); 479 480 if (IS_FASTOPEN(tp->t_flags)) 481 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 482 483 out: 484 TCPDEBUG2(PRU_LISTEN); 485 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 486 INP_WUNLOCK(inp); 487 return (error); 488 } 489 #endif /* INET6 */ 490 491 #ifdef INET 492 /* 493 * Initiate connection to peer. 494 * Create a template for use in transmissions on this connection. 495 * Enter SYN_SENT state, and mark socket as connecting. 496 * Start keep-alive timer, and seed output sequence space. 497 * Send initial segment on connection. 498 */ 499 static int 500 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 501 { 502 int error = 0; 503 struct inpcb *inp; 504 struct tcpcb *tp = NULL; 505 struct sockaddr_in *sinp; 506 507 sinp = (struct sockaddr_in *)nam; 508 if (nam->sa_len != sizeof (*sinp)) 509 return (EINVAL); 510 /* 511 * Must disallow TCP ``connections'' to multicast addresses. 512 */ 513 if (sinp->sin_family == AF_INET 514 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 515 return (EAFNOSUPPORT); 516 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 517 return (error); 518 519 TCPDEBUG0; 520 inp = sotoinpcb(so); 521 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 522 INP_WLOCK(inp); 523 if (inp->inp_flags & INP_TIMEWAIT) { 524 error = EADDRINUSE; 525 goto out; 526 } 527 if (inp->inp_flags & INP_DROPPED) { 528 error = ECONNREFUSED; 529 goto out; 530 } 531 tp = intotcpcb(inp); 532 TCPDEBUG1(); 533 if ((error = tcp_connect(tp, nam, td)) != 0) 534 goto out; 535 #ifdef TCP_OFFLOAD 536 if (registered_toedevs > 0 && 537 (so->so_options & SO_NO_OFFLOAD) == 0 && 538 (error = tcp_offload_connect(so, nam)) == 0) 539 goto out; 540 #endif 541 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 542 error = tp->t_fb->tfb_tcp_output(tp); 543 out: 544 TCPDEBUG2(PRU_CONNECT); 545 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 546 INP_WUNLOCK(inp); 547 return (error); 548 } 549 #endif /* INET */ 550 551 #ifdef INET6 552 static int 553 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 554 { 555 int error = 0; 556 struct inpcb *inp; 557 struct tcpcb *tp = NULL; 558 struct sockaddr_in6 *sin6p; 559 560 TCPDEBUG0; 561 562 sin6p = (struct sockaddr_in6 *)nam; 563 if (nam->sa_len != sizeof (*sin6p)) 564 return (EINVAL); 565 /* 566 * Must disallow TCP ``connections'' to multicast addresses. 567 */ 568 if (sin6p->sin6_family == AF_INET6 569 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 570 return (EAFNOSUPPORT); 571 572 inp = sotoinpcb(so); 573 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 574 INP_WLOCK(inp); 575 if (inp->inp_flags & INP_TIMEWAIT) { 576 error = EADDRINUSE; 577 goto out; 578 } 579 if (inp->inp_flags & INP_DROPPED) { 580 error = ECONNREFUSED; 581 goto out; 582 } 583 tp = intotcpcb(inp); 584 TCPDEBUG1(); 585 #ifdef INET 586 /* 587 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 588 * therefore probably require the hash lock, which isn't held here. 589 * Is this a significant problem? 590 */ 591 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 592 struct sockaddr_in sin; 593 594 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 595 error = EINVAL; 596 goto out; 597 } 598 if ((inp->inp_vflag & INP_IPV4) == 0) { 599 error = EAFNOSUPPORT; 600 goto out; 601 } 602 603 in6_sin6_2_sin(&sin, sin6p); 604 inp->inp_vflag |= INP_IPV4; 605 inp->inp_vflag &= ~INP_IPV6; 606 if ((error = prison_remote_ip4(td->td_ucred, 607 &sin.sin_addr)) != 0) 608 goto out; 609 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 610 goto out; 611 #ifdef TCP_OFFLOAD 612 if (registered_toedevs > 0 && 613 (so->so_options & SO_NO_OFFLOAD) == 0 && 614 (error = tcp_offload_connect(so, nam)) == 0) 615 goto out; 616 #endif 617 error = tp->t_fb->tfb_tcp_output(tp); 618 goto out; 619 } else { 620 if ((inp->inp_vflag & INP_IPV6) == 0) { 621 error = EAFNOSUPPORT; 622 goto out; 623 } 624 } 625 #endif 626 inp->inp_vflag &= ~INP_IPV4; 627 inp->inp_vflag |= INP_IPV6; 628 inp->inp_inc.inc_flags |= INC_ISIPV6; 629 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 630 goto out; 631 if ((error = tcp6_connect(tp, nam, td)) != 0) 632 goto out; 633 #ifdef TCP_OFFLOAD 634 if (registered_toedevs > 0 && 635 (so->so_options & SO_NO_OFFLOAD) == 0 && 636 (error = tcp_offload_connect(so, nam)) == 0) 637 goto out; 638 #endif 639 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 640 error = tp->t_fb->tfb_tcp_output(tp); 641 642 out: 643 TCPDEBUG2(PRU_CONNECT); 644 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 645 INP_WUNLOCK(inp); 646 return (error); 647 } 648 #endif /* INET6 */ 649 650 /* 651 * Initiate disconnect from peer. 652 * If connection never passed embryonic stage, just drop; 653 * else if don't need to let data drain, then can just drop anyways, 654 * else have to begin TCP shutdown process: mark socket disconnecting, 655 * drain unread data, state switch to reflect user close, and 656 * send segment (e.g. FIN) to peer. Socket will be really disconnected 657 * when peer sends FIN and acks ours. 658 * 659 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 660 */ 661 static int 662 tcp_usr_disconnect(struct socket *so) 663 { 664 struct inpcb *inp; 665 struct tcpcb *tp = NULL; 666 int error = 0; 667 668 TCPDEBUG0; 669 INP_INFO_RLOCK(&V_tcbinfo); 670 inp = sotoinpcb(so); 671 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 672 INP_WLOCK(inp); 673 if (inp->inp_flags & INP_TIMEWAIT) 674 goto out; 675 if (inp->inp_flags & INP_DROPPED) { 676 error = ECONNRESET; 677 goto out; 678 } 679 tp = intotcpcb(inp); 680 TCPDEBUG1(); 681 tcp_disconnect(tp); 682 out: 683 TCPDEBUG2(PRU_DISCONNECT); 684 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 685 INP_WUNLOCK(inp); 686 INP_INFO_RUNLOCK(&V_tcbinfo); 687 return (error); 688 } 689 690 #ifdef INET 691 /* 692 * Accept a connection. Essentially all the work is done at higher levels; 693 * just return the address of the peer, storing through addr. 694 */ 695 static int 696 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 697 { 698 int error = 0; 699 struct inpcb *inp = NULL; 700 struct tcpcb *tp = NULL; 701 struct in_addr addr; 702 in_port_t port = 0; 703 TCPDEBUG0; 704 705 if (so->so_state & SS_ISDISCONNECTED) 706 return (ECONNABORTED); 707 708 inp = sotoinpcb(so); 709 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 710 INP_WLOCK(inp); 711 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 712 error = ECONNABORTED; 713 goto out; 714 } 715 tp = intotcpcb(inp); 716 TCPDEBUG1(); 717 718 /* 719 * We inline in_getpeeraddr and COMMON_END here, so that we can 720 * copy the data of interest and defer the malloc until after we 721 * release the lock. 722 */ 723 port = inp->inp_fport; 724 addr = inp->inp_faddr; 725 726 out: 727 TCPDEBUG2(PRU_ACCEPT); 728 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 729 INP_WUNLOCK(inp); 730 if (error == 0) 731 *nam = in_sockaddr(port, &addr); 732 return error; 733 } 734 #endif /* INET */ 735 736 #ifdef INET6 737 static int 738 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 739 { 740 struct inpcb *inp = NULL; 741 int error = 0; 742 struct tcpcb *tp = NULL; 743 struct in_addr addr; 744 struct in6_addr addr6; 745 in_port_t port = 0; 746 int v4 = 0; 747 TCPDEBUG0; 748 749 if (so->so_state & SS_ISDISCONNECTED) 750 return (ECONNABORTED); 751 752 inp = sotoinpcb(so); 753 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 754 INP_INFO_RLOCK(&V_tcbinfo); 755 INP_WLOCK(inp); 756 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 757 error = ECONNABORTED; 758 goto out; 759 } 760 tp = intotcpcb(inp); 761 TCPDEBUG1(); 762 763 /* 764 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 765 * copy the data of interest and defer the malloc until after we 766 * release the lock. 767 */ 768 if (inp->inp_vflag & INP_IPV4) { 769 v4 = 1; 770 port = inp->inp_fport; 771 addr = inp->inp_faddr; 772 } else { 773 port = inp->inp_fport; 774 addr6 = inp->in6p_faddr; 775 } 776 777 out: 778 TCPDEBUG2(PRU_ACCEPT); 779 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 780 INP_WUNLOCK(inp); 781 INP_INFO_RUNLOCK(&V_tcbinfo); 782 if (error == 0) { 783 if (v4) 784 *nam = in6_v4mapsin6_sockaddr(port, &addr); 785 else 786 *nam = in6_sockaddr(port, &addr6); 787 } 788 return error; 789 } 790 #endif /* INET6 */ 791 792 /* 793 * Mark the connection as being incapable of further output. 794 */ 795 static int 796 tcp_usr_shutdown(struct socket *so) 797 { 798 int error = 0; 799 struct inpcb *inp; 800 struct tcpcb *tp = NULL; 801 802 TCPDEBUG0; 803 INP_INFO_RLOCK(&V_tcbinfo); 804 inp = sotoinpcb(so); 805 KASSERT(inp != NULL, ("inp == NULL")); 806 INP_WLOCK(inp); 807 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 808 error = ECONNRESET; 809 goto out; 810 } 811 tp = intotcpcb(inp); 812 TCPDEBUG1(); 813 socantsendmore(so); 814 tcp_usrclosed(tp); 815 if (!(inp->inp_flags & INP_DROPPED)) 816 error = tp->t_fb->tfb_tcp_output(tp); 817 818 out: 819 TCPDEBUG2(PRU_SHUTDOWN); 820 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 821 INP_WUNLOCK(inp); 822 INP_INFO_RUNLOCK(&V_tcbinfo); 823 824 return (error); 825 } 826 827 /* 828 * After a receive, possibly send window update to peer. 829 */ 830 static int 831 tcp_usr_rcvd(struct socket *so, int flags) 832 { 833 struct inpcb *inp; 834 struct tcpcb *tp = NULL; 835 int error = 0; 836 837 TCPDEBUG0; 838 inp = sotoinpcb(so); 839 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 840 INP_WLOCK(inp); 841 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 842 error = ECONNRESET; 843 goto out; 844 } 845 tp = intotcpcb(inp); 846 TCPDEBUG1(); 847 /* 848 * For passively-created TFO connections, don't attempt a window 849 * update while still in SYN_RECEIVED as this may trigger an early 850 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 851 * application response data, or failing that, when the DELACK timer 852 * expires. 853 */ 854 if (IS_FASTOPEN(tp->t_flags) && 855 (tp->t_state == TCPS_SYN_RECEIVED)) 856 goto out; 857 #ifdef TCP_OFFLOAD 858 if (tp->t_flags & TF_TOE) 859 tcp_offload_rcvd(tp); 860 else 861 #endif 862 tp->t_fb->tfb_tcp_output(tp); 863 864 out: 865 TCPDEBUG2(PRU_RCVD); 866 TCP_PROBE2(debug__user, tp, PRU_RCVD); 867 INP_WUNLOCK(inp); 868 return (error); 869 } 870 871 /* 872 * Do a send by putting data in output queue and updating urgent 873 * marker if URG set. Possibly send more data. Unlike the other 874 * pru_*() routines, the mbuf chains are our responsibility. We 875 * must either enqueue them or free them. The other pru_* routines 876 * generally are caller-frees. 877 */ 878 static int 879 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 880 struct sockaddr *nam, struct mbuf *control, struct thread *td) 881 { 882 int error = 0; 883 struct inpcb *inp; 884 struct tcpcb *tp = NULL; 885 #ifdef INET6 886 int isipv6; 887 #endif 888 TCPDEBUG0; 889 890 /* 891 * We require the pcbinfo lock if we will close the socket as part of 892 * this call. 893 */ 894 if (flags & PRUS_EOF) 895 INP_INFO_RLOCK(&V_tcbinfo); 896 inp = sotoinpcb(so); 897 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 898 INP_WLOCK(inp); 899 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 900 if (control) 901 m_freem(control); 902 /* 903 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 904 * for freeing memory. 905 */ 906 if (m && (flags & PRUS_NOTREADY) == 0) 907 m_freem(m); 908 error = ECONNRESET; 909 goto out; 910 } 911 #ifdef INET6 912 isipv6 = nam && nam->sa_family == AF_INET6; 913 #endif /* INET6 */ 914 tp = intotcpcb(inp); 915 TCPDEBUG1(); 916 if (control) { 917 /* TCP doesn't do control messages (rights, creds, etc) */ 918 if (control->m_len) { 919 m_freem(control); 920 if (m) 921 m_freem(m); 922 error = EINVAL; 923 goto out; 924 } 925 m_freem(control); /* empty control, just free it */ 926 } 927 if (!(flags & PRUS_OOB)) { 928 sbappendstream(&so->so_snd, m, flags); 929 if (nam && tp->t_state < TCPS_SYN_SENT) { 930 /* 931 * Do implied connect if not yet connected, 932 * initialize window to default value, and 933 * initialize maxseg using peer's cached MSS. 934 */ 935 #ifdef INET6 936 if (isipv6) 937 error = tcp6_connect(tp, nam, td); 938 #endif /* INET6 */ 939 #if defined(INET6) && defined(INET) 940 else 941 #endif 942 #ifdef INET 943 error = tcp_connect(tp, nam, td); 944 #endif 945 if (error) 946 goto out; 947 if (IS_FASTOPEN(tp->t_flags)) 948 tcp_fastopen_connect(tp); 949 else { 950 tp->snd_wnd = TTCP_CLIENT_SND_WND; 951 tcp_mss(tp, -1); 952 } 953 } 954 if (flags & PRUS_EOF) { 955 /* 956 * Close the send side of the connection after 957 * the data is sent. 958 */ 959 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 960 socantsendmore(so); 961 tcp_usrclosed(tp); 962 } 963 if (!(inp->inp_flags & INP_DROPPED) && 964 !(flags & PRUS_NOTREADY)) { 965 if (flags & PRUS_MORETOCOME) 966 tp->t_flags |= TF_MORETOCOME; 967 error = tp->t_fb->tfb_tcp_output(tp); 968 if (flags & PRUS_MORETOCOME) 969 tp->t_flags &= ~TF_MORETOCOME; 970 } 971 } else { 972 /* 973 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 974 */ 975 SOCKBUF_LOCK(&so->so_snd); 976 if (sbspace(&so->so_snd) < -512) { 977 SOCKBUF_UNLOCK(&so->so_snd); 978 m_freem(m); 979 error = ENOBUFS; 980 goto out; 981 } 982 /* 983 * According to RFC961 (Assigned Protocols), 984 * the urgent pointer points to the last octet 985 * of urgent data. We continue, however, 986 * to consider it to indicate the first octet 987 * of data past the urgent section. 988 * Otherwise, snd_up should be one lower. 989 */ 990 sbappendstream_locked(&so->so_snd, m, flags); 991 SOCKBUF_UNLOCK(&so->so_snd); 992 if (nam && tp->t_state < TCPS_SYN_SENT) { 993 /* 994 * Do implied connect if not yet connected, 995 * initialize window to default value, and 996 * initialize maxseg using peer's cached MSS. 997 */ 998 999 /* 1000 * Not going to contemplate SYN|URG 1001 */ 1002 if (IS_FASTOPEN(tp->t_flags)) 1003 tp->t_flags &= ~TF_FASTOPEN; 1004 #ifdef INET6 1005 if (isipv6) 1006 error = tcp6_connect(tp, nam, td); 1007 #endif /* INET6 */ 1008 #if defined(INET6) && defined(INET) 1009 else 1010 #endif 1011 #ifdef INET 1012 error = tcp_connect(tp, nam, td); 1013 #endif 1014 if (error) 1015 goto out; 1016 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1017 tcp_mss(tp, -1); 1018 } 1019 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1020 if (!(flags & PRUS_NOTREADY)) { 1021 tp->t_flags |= TF_FORCEDATA; 1022 error = tp->t_fb->tfb_tcp_output(tp); 1023 tp->t_flags &= ~TF_FORCEDATA; 1024 } 1025 } 1026 out: 1027 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1028 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1029 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1030 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1031 INP_WUNLOCK(inp); 1032 if (flags & PRUS_EOF) 1033 INP_INFO_RUNLOCK(&V_tcbinfo); 1034 return (error); 1035 } 1036 1037 static int 1038 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1039 { 1040 struct inpcb *inp; 1041 struct tcpcb *tp; 1042 int error; 1043 1044 inp = sotoinpcb(so); 1045 INP_WLOCK(inp); 1046 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1047 INP_WUNLOCK(inp); 1048 for (int i = 0; i < count; i++) 1049 m = m_free(m); 1050 return (ECONNRESET); 1051 } 1052 tp = intotcpcb(inp); 1053 1054 SOCKBUF_LOCK(&so->so_snd); 1055 error = sbready(&so->so_snd, m, count); 1056 SOCKBUF_UNLOCK(&so->so_snd); 1057 if (error == 0) 1058 error = tp->t_fb->tfb_tcp_output(tp); 1059 INP_WUNLOCK(inp); 1060 1061 return (error); 1062 } 1063 1064 /* 1065 * Abort the TCP. Drop the connection abruptly. 1066 */ 1067 static void 1068 tcp_usr_abort(struct socket *so) 1069 { 1070 struct inpcb *inp; 1071 struct tcpcb *tp = NULL; 1072 TCPDEBUG0; 1073 1074 inp = sotoinpcb(so); 1075 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1076 1077 INP_INFO_RLOCK(&V_tcbinfo); 1078 INP_WLOCK(inp); 1079 KASSERT(inp->inp_socket != NULL, 1080 ("tcp_usr_abort: inp_socket == NULL")); 1081 1082 /* 1083 * If we still have full TCP state, and we're not dropped, drop. 1084 */ 1085 if (!(inp->inp_flags & INP_TIMEWAIT) && 1086 !(inp->inp_flags & INP_DROPPED)) { 1087 tp = intotcpcb(inp); 1088 TCPDEBUG1(); 1089 tcp_drop(tp, ECONNABORTED); 1090 TCPDEBUG2(PRU_ABORT); 1091 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1092 } 1093 if (!(inp->inp_flags & INP_DROPPED)) { 1094 SOCK_LOCK(so); 1095 so->so_state |= SS_PROTOREF; 1096 SOCK_UNLOCK(so); 1097 inp->inp_flags |= INP_SOCKREF; 1098 } 1099 INP_WUNLOCK(inp); 1100 INP_INFO_RUNLOCK(&V_tcbinfo); 1101 } 1102 1103 /* 1104 * TCP socket is closed. Start friendly disconnect. 1105 */ 1106 static void 1107 tcp_usr_close(struct socket *so) 1108 { 1109 struct inpcb *inp; 1110 struct tcpcb *tp = NULL; 1111 TCPDEBUG0; 1112 1113 inp = sotoinpcb(so); 1114 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1115 1116 INP_INFO_RLOCK(&V_tcbinfo); 1117 INP_WLOCK(inp); 1118 KASSERT(inp->inp_socket != NULL, 1119 ("tcp_usr_close: inp_socket == NULL")); 1120 1121 /* 1122 * If we still have full TCP state, and we're not dropped, initiate 1123 * a disconnect. 1124 */ 1125 if (!(inp->inp_flags & INP_TIMEWAIT) && 1126 !(inp->inp_flags & INP_DROPPED)) { 1127 tp = intotcpcb(inp); 1128 TCPDEBUG1(); 1129 tcp_disconnect(tp); 1130 TCPDEBUG2(PRU_CLOSE); 1131 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1132 } 1133 if (!(inp->inp_flags & INP_DROPPED)) { 1134 SOCK_LOCK(so); 1135 so->so_state |= SS_PROTOREF; 1136 SOCK_UNLOCK(so); 1137 inp->inp_flags |= INP_SOCKREF; 1138 } 1139 INP_WUNLOCK(inp); 1140 INP_INFO_RUNLOCK(&V_tcbinfo); 1141 } 1142 1143 /* 1144 * Receive out-of-band data. 1145 */ 1146 static int 1147 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1148 { 1149 int error = 0; 1150 struct inpcb *inp; 1151 struct tcpcb *tp = NULL; 1152 1153 TCPDEBUG0; 1154 inp = sotoinpcb(so); 1155 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1156 INP_WLOCK(inp); 1157 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1158 error = ECONNRESET; 1159 goto out; 1160 } 1161 tp = intotcpcb(inp); 1162 TCPDEBUG1(); 1163 if ((so->so_oobmark == 0 && 1164 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1165 so->so_options & SO_OOBINLINE || 1166 tp->t_oobflags & TCPOOB_HADDATA) { 1167 error = EINVAL; 1168 goto out; 1169 } 1170 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1171 error = EWOULDBLOCK; 1172 goto out; 1173 } 1174 m->m_len = 1; 1175 *mtod(m, caddr_t) = tp->t_iobc; 1176 if ((flags & MSG_PEEK) == 0) 1177 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1178 1179 out: 1180 TCPDEBUG2(PRU_RCVOOB); 1181 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1182 INP_WUNLOCK(inp); 1183 return (error); 1184 } 1185 1186 #ifdef INET 1187 struct pr_usrreqs tcp_usrreqs = { 1188 .pru_abort = tcp_usr_abort, 1189 .pru_accept = tcp_usr_accept, 1190 .pru_attach = tcp_usr_attach, 1191 .pru_bind = tcp_usr_bind, 1192 .pru_connect = tcp_usr_connect, 1193 .pru_control = in_control, 1194 .pru_detach = tcp_usr_detach, 1195 .pru_disconnect = tcp_usr_disconnect, 1196 .pru_listen = tcp_usr_listen, 1197 .pru_peeraddr = in_getpeeraddr, 1198 .pru_rcvd = tcp_usr_rcvd, 1199 .pru_rcvoob = tcp_usr_rcvoob, 1200 .pru_send = tcp_usr_send, 1201 .pru_ready = tcp_usr_ready, 1202 .pru_shutdown = tcp_usr_shutdown, 1203 .pru_sockaddr = in_getsockaddr, 1204 .pru_sosetlabel = in_pcbsosetlabel, 1205 .pru_close = tcp_usr_close, 1206 }; 1207 #endif /* INET */ 1208 1209 #ifdef INET6 1210 struct pr_usrreqs tcp6_usrreqs = { 1211 .pru_abort = tcp_usr_abort, 1212 .pru_accept = tcp6_usr_accept, 1213 .pru_attach = tcp_usr_attach, 1214 .pru_bind = tcp6_usr_bind, 1215 .pru_connect = tcp6_usr_connect, 1216 .pru_control = in6_control, 1217 .pru_detach = tcp_usr_detach, 1218 .pru_disconnect = tcp_usr_disconnect, 1219 .pru_listen = tcp6_usr_listen, 1220 .pru_peeraddr = in6_mapped_peeraddr, 1221 .pru_rcvd = tcp_usr_rcvd, 1222 .pru_rcvoob = tcp_usr_rcvoob, 1223 .pru_send = tcp_usr_send, 1224 .pru_ready = tcp_usr_ready, 1225 .pru_shutdown = tcp_usr_shutdown, 1226 .pru_sockaddr = in6_mapped_sockaddr, 1227 .pru_sosetlabel = in_pcbsosetlabel, 1228 .pru_close = tcp_usr_close, 1229 }; 1230 #endif /* INET6 */ 1231 1232 #ifdef INET 1233 /* 1234 * Common subroutine to open a TCP connection to remote host specified 1235 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1236 * port number if needed. Call in_pcbconnect_setup to do the routing and 1237 * to choose a local host address (interface). If there is an existing 1238 * incarnation of the same connection in TIME-WAIT state and if the remote 1239 * host was sending CC options and if the connection duration was < MSL, then 1240 * truncate the previous TIME-WAIT state and proceed. 1241 * Initialize connection parameters and enter SYN-SENT state. 1242 */ 1243 static int 1244 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1245 { 1246 struct inpcb *inp = tp->t_inpcb, *oinp; 1247 struct socket *so = inp->inp_socket; 1248 struct in_addr laddr; 1249 u_short lport; 1250 int error; 1251 1252 INP_WLOCK_ASSERT(inp); 1253 INP_HASH_WLOCK(&V_tcbinfo); 1254 1255 if (inp->inp_lport == 0) { 1256 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1257 if (error) 1258 goto out; 1259 } 1260 1261 /* 1262 * Cannot simply call in_pcbconnect, because there might be an 1263 * earlier incarnation of this same connection still in 1264 * TIME_WAIT state, creating an ADDRINUSE error. 1265 */ 1266 laddr = inp->inp_laddr; 1267 lport = inp->inp_lport; 1268 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1269 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1270 if (error && oinp == NULL) 1271 goto out; 1272 if (oinp) { 1273 error = EADDRINUSE; 1274 goto out; 1275 } 1276 inp->inp_laddr = laddr; 1277 in_pcbrehash(inp); 1278 INP_HASH_WUNLOCK(&V_tcbinfo); 1279 1280 /* 1281 * Compute window scaling to request: 1282 * Scale to fit into sweet spot. See tcp_syncache.c. 1283 * XXX: This should move to tcp_output(). 1284 */ 1285 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1286 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1287 tp->request_r_scale++; 1288 1289 soisconnecting(so); 1290 TCPSTAT_INC(tcps_connattempt); 1291 tcp_state_change(tp, TCPS_SYN_SENT); 1292 tp->iss = tcp_new_isn(tp); 1293 tcp_sendseqinit(tp); 1294 1295 return 0; 1296 1297 out: 1298 INP_HASH_WUNLOCK(&V_tcbinfo); 1299 return (error); 1300 } 1301 #endif /* INET */ 1302 1303 #ifdef INET6 1304 static int 1305 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1306 { 1307 struct inpcb *inp = tp->t_inpcb; 1308 int error; 1309 1310 INP_WLOCK_ASSERT(inp); 1311 INP_HASH_WLOCK(&V_tcbinfo); 1312 1313 if (inp->inp_lport == 0) { 1314 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1315 if (error) 1316 goto out; 1317 } 1318 error = in6_pcbconnect(inp, nam, td->td_ucred); 1319 if (error != 0) 1320 goto out; 1321 INP_HASH_WUNLOCK(&V_tcbinfo); 1322 1323 /* Compute window scaling to request. */ 1324 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1325 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1326 tp->request_r_scale++; 1327 1328 soisconnecting(inp->inp_socket); 1329 TCPSTAT_INC(tcps_connattempt); 1330 tcp_state_change(tp, TCPS_SYN_SENT); 1331 tp->iss = tcp_new_isn(tp); 1332 tcp_sendseqinit(tp); 1333 1334 return 0; 1335 1336 out: 1337 INP_HASH_WUNLOCK(&V_tcbinfo); 1338 return error; 1339 } 1340 #endif /* INET6 */ 1341 1342 /* 1343 * Export TCP internal state information via a struct tcp_info, based on the 1344 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1345 * (TCP state machine, etc). We export all information using FreeBSD-native 1346 * constants -- for example, the numeric values for tcpi_state will differ 1347 * from Linux. 1348 */ 1349 static void 1350 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1351 { 1352 1353 INP_WLOCK_ASSERT(tp->t_inpcb); 1354 bzero(ti, sizeof(*ti)); 1355 1356 ti->tcpi_state = tp->t_state; 1357 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1358 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1359 if (tp->t_flags & TF_SACK_PERMIT) 1360 ti->tcpi_options |= TCPI_OPT_SACK; 1361 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1362 ti->tcpi_options |= TCPI_OPT_WSCALE; 1363 ti->tcpi_snd_wscale = tp->snd_scale; 1364 ti->tcpi_rcv_wscale = tp->rcv_scale; 1365 } 1366 if (tp->t_flags & TF_ECN_PERMIT) 1367 ti->tcpi_options |= TCPI_OPT_ECN; 1368 1369 ti->tcpi_rto = tp->t_rxtcur * tick; 1370 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1371 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1372 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1373 1374 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1375 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1376 1377 /* 1378 * FreeBSD-specific extension fields for tcp_info. 1379 */ 1380 ti->tcpi_rcv_space = tp->rcv_wnd; 1381 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1382 ti->tcpi_snd_wnd = tp->snd_wnd; 1383 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1384 ti->tcpi_snd_nxt = tp->snd_nxt; 1385 ti->tcpi_snd_mss = tp->t_maxseg; 1386 ti->tcpi_rcv_mss = tp->t_maxseg; 1387 if (tp->t_flags & TF_TOE) 1388 ti->tcpi_options |= TCPI_OPT_TOE; 1389 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1390 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1391 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1392 } 1393 1394 /* 1395 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1396 * socket option arguments. When it re-acquires the lock after the copy, it 1397 * has to revalidate that the connection is still valid for the socket 1398 * option. 1399 */ 1400 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1401 INP_WLOCK(inp); \ 1402 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1403 INP_WUNLOCK(inp); \ 1404 cleanup; \ 1405 return (ECONNRESET); \ 1406 } \ 1407 tp = intotcpcb(inp); \ 1408 } while(0) 1409 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1410 1411 int 1412 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1413 { 1414 int error; 1415 struct inpcb *inp; 1416 struct tcpcb *tp; 1417 struct tcp_function_block *blk; 1418 struct tcp_function_set fsn; 1419 1420 error = 0; 1421 inp = sotoinpcb(so); 1422 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1423 INP_WLOCK(inp); 1424 if (sopt->sopt_level != IPPROTO_TCP) { 1425 #ifdef INET6 1426 if (inp->inp_vflag & INP_IPV6PROTO) { 1427 INP_WUNLOCK(inp); 1428 error = ip6_ctloutput(so, sopt); 1429 } 1430 #endif /* INET6 */ 1431 #if defined(INET6) && defined(INET) 1432 else 1433 #endif 1434 #ifdef INET 1435 { 1436 INP_WUNLOCK(inp); 1437 error = ip_ctloutput(so, sopt); 1438 } 1439 #endif 1440 return (error); 1441 } 1442 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1443 INP_WUNLOCK(inp); 1444 return (ECONNRESET); 1445 } 1446 tp = intotcpcb(inp); 1447 /* 1448 * Protect the TCP option TCP_FUNCTION_BLK so 1449 * that a sub-function can *never* overwrite this. 1450 */ 1451 if ((sopt->sopt_dir == SOPT_SET) && 1452 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1453 INP_WUNLOCK(inp); 1454 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1455 sizeof fsn); 1456 if (error) 1457 return (error); 1458 INP_WLOCK_RECHECK(inp); 1459 blk = find_and_ref_tcp_functions(&fsn); 1460 if (blk == NULL) { 1461 INP_WUNLOCK(inp); 1462 return (ENOENT); 1463 } 1464 if (tp->t_fb == blk) { 1465 /* You already have this */ 1466 refcount_release(&blk->tfb_refcnt); 1467 INP_WUNLOCK(inp); 1468 return (0); 1469 } 1470 if (tp->t_state != TCPS_CLOSED) { 1471 int error=EINVAL; 1472 /* 1473 * The user has advanced the state 1474 * past the initial point, we may not 1475 * be able to switch. 1476 */ 1477 if (blk->tfb_tcp_handoff_ok != NULL) { 1478 /* 1479 * Does the stack provide a 1480 * query mechanism, if so it may 1481 * still be possible? 1482 */ 1483 error = (*blk->tfb_tcp_handoff_ok)(tp); 1484 } 1485 if (error) { 1486 refcount_release(&blk->tfb_refcnt); 1487 INP_WUNLOCK(inp); 1488 return(error); 1489 } 1490 } 1491 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1492 refcount_release(&blk->tfb_refcnt); 1493 INP_WUNLOCK(inp); 1494 return (ENOENT); 1495 } 1496 /* 1497 * Release the old refcnt, the 1498 * lookup acquired a ref on the 1499 * new one already. 1500 */ 1501 if (tp->t_fb->tfb_tcp_fb_fini) { 1502 /* 1503 * Tell the stack to cleanup with 0 i.e. 1504 * the tcb is not going away. 1505 */ 1506 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1507 } 1508 refcount_release(&tp->t_fb->tfb_refcnt); 1509 tp->t_fb = blk; 1510 if (tp->t_fb->tfb_tcp_fb_init) { 1511 (*tp->t_fb->tfb_tcp_fb_init)(tp); 1512 } 1513 #ifdef TCP_OFFLOAD 1514 if (tp->t_flags & TF_TOE) { 1515 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1516 sopt->sopt_name); 1517 } 1518 #endif 1519 INP_WUNLOCK(inp); 1520 return (error); 1521 } else if ((sopt->sopt_dir == SOPT_GET) && 1522 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1523 strcpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name); 1524 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1525 INP_WUNLOCK(inp); 1526 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1527 return (error); 1528 } 1529 /* Pass in the INP locked, called must unlock it */ 1530 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1531 } 1532 1533 int 1534 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1535 { 1536 int error, opt, optval; 1537 u_int ui; 1538 struct tcp_info ti; 1539 struct cc_algo *algo; 1540 char *pbuf, buf[TCP_CA_NAME_MAX]; 1541 size_t len; 1542 1543 /* 1544 * For TCP_CCALGOOPT forward the control to CC module, for both 1545 * SOPT_SET and SOPT_GET. 1546 */ 1547 switch (sopt->sopt_name) { 1548 case TCP_CCALGOOPT: 1549 INP_WUNLOCK(inp); 1550 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1551 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1552 sopt->sopt_valsize); 1553 if (error) { 1554 free(pbuf, M_TEMP); 1555 return (error); 1556 } 1557 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1558 if (CC_ALGO(tp)->ctl_output != NULL) 1559 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1560 else 1561 error = ENOENT; 1562 INP_WUNLOCK(inp); 1563 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1564 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1565 free(pbuf, M_TEMP); 1566 return (error); 1567 } 1568 1569 switch (sopt->sopt_dir) { 1570 case SOPT_SET: 1571 switch (sopt->sopt_name) { 1572 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1573 case TCP_MD5SIG: 1574 if (!TCPMD5_ENABLED()) { 1575 INP_WUNLOCK(inp); 1576 return (ENOPROTOOPT); 1577 } 1578 error = TCPMD5_PCBCTL(inp, sopt); 1579 if (error) 1580 return (error); 1581 goto unlock_and_done; 1582 #endif /* IPSEC */ 1583 1584 case TCP_NODELAY: 1585 case TCP_NOOPT: 1586 INP_WUNLOCK(inp); 1587 error = sooptcopyin(sopt, &optval, sizeof optval, 1588 sizeof optval); 1589 if (error) 1590 return (error); 1591 1592 INP_WLOCK_RECHECK(inp); 1593 switch (sopt->sopt_name) { 1594 case TCP_NODELAY: 1595 opt = TF_NODELAY; 1596 break; 1597 case TCP_NOOPT: 1598 opt = TF_NOOPT; 1599 break; 1600 default: 1601 opt = 0; /* dead code to fool gcc */ 1602 break; 1603 } 1604 1605 if (optval) 1606 tp->t_flags |= opt; 1607 else 1608 tp->t_flags &= ~opt; 1609 unlock_and_done: 1610 #ifdef TCP_OFFLOAD 1611 if (tp->t_flags & TF_TOE) { 1612 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1613 sopt->sopt_name); 1614 } 1615 #endif 1616 INP_WUNLOCK(inp); 1617 break; 1618 1619 case TCP_NOPUSH: 1620 INP_WUNLOCK(inp); 1621 error = sooptcopyin(sopt, &optval, sizeof optval, 1622 sizeof optval); 1623 if (error) 1624 return (error); 1625 1626 INP_WLOCK_RECHECK(inp); 1627 if (optval) 1628 tp->t_flags |= TF_NOPUSH; 1629 else if (tp->t_flags & TF_NOPUSH) { 1630 tp->t_flags &= ~TF_NOPUSH; 1631 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1632 error = tp->t_fb->tfb_tcp_output(tp); 1633 } 1634 goto unlock_and_done; 1635 1636 case TCP_MAXSEG: 1637 INP_WUNLOCK(inp); 1638 error = sooptcopyin(sopt, &optval, sizeof optval, 1639 sizeof optval); 1640 if (error) 1641 return (error); 1642 1643 INP_WLOCK_RECHECK(inp); 1644 if (optval > 0 && optval <= tp->t_maxseg && 1645 optval + 40 >= V_tcp_minmss) 1646 tp->t_maxseg = optval; 1647 else 1648 error = EINVAL; 1649 goto unlock_and_done; 1650 1651 case TCP_INFO: 1652 INP_WUNLOCK(inp); 1653 error = EINVAL; 1654 break; 1655 1656 case TCP_CONGESTION: 1657 INP_WUNLOCK(inp); 1658 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1659 if (error) 1660 break; 1661 buf[sopt->sopt_valsize] = '\0'; 1662 INP_WLOCK_RECHECK(inp); 1663 CC_LIST_RLOCK(); 1664 STAILQ_FOREACH(algo, &cc_list, entries) 1665 if (strncmp(buf, algo->name, 1666 TCP_CA_NAME_MAX) == 0) 1667 break; 1668 CC_LIST_RUNLOCK(); 1669 if (algo == NULL) { 1670 INP_WUNLOCK(inp); 1671 error = EINVAL; 1672 break; 1673 } 1674 /* 1675 * We hold a write lock over the tcb so it's safe to 1676 * do these things without ordering concerns. 1677 */ 1678 if (CC_ALGO(tp)->cb_destroy != NULL) 1679 CC_ALGO(tp)->cb_destroy(tp->ccv); 1680 CC_ALGO(tp) = algo; 1681 /* 1682 * If something goes pear shaped initialising the new 1683 * algo, fall back to newreno (which does not 1684 * require initialisation). 1685 */ 1686 if (algo->cb_init != NULL && 1687 algo->cb_init(tp->ccv) != 0) { 1688 CC_ALGO(tp) = &newreno_cc_algo; 1689 /* 1690 * The only reason init should fail is 1691 * because of malloc. 1692 */ 1693 error = ENOMEM; 1694 } 1695 INP_WUNLOCK(inp); 1696 break; 1697 1698 case TCP_KEEPIDLE: 1699 case TCP_KEEPINTVL: 1700 case TCP_KEEPINIT: 1701 INP_WUNLOCK(inp); 1702 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1703 if (error) 1704 return (error); 1705 1706 if (ui > (UINT_MAX / hz)) { 1707 error = EINVAL; 1708 break; 1709 } 1710 ui *= hz; 1711 1712 INP_WLOCK_RECHECK(inp); 1713 switch (sopt->sopt_name) { 1714 case TCP_KEEPIDLE: 1715 tp->t_keepidle = ui; 1716 /* 1717 * XXX: better check current remaining 1718 * timeout and "merge" it with new value. 1719 */ 1720 if ((tp->t_state > TCPS_LISTEN) && 1721 (tp->t_state <= TCPS_CLOSING)) 1722 tcp_timer_activate(tp, TT_KEEP, 1723 TP_KEEPIDLE(tp)); 1724 break; 1725 case TCP_KEEPINTVL: 1726 tp->t_keepintvl = ui; 1727 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1728 (TP_MAXIDLE(tp) > 0)) 1729 tcp_timer_activate(tp, TT_2MSL, 1730 TP_MAXIDLE(tp)); 1731 break; 1732 case TCP_KEEPINIT: 1733 tp->t_keepinit = ui; 1734 if (tp->t_state == TCPS_SYN_RECEIVED || 1735 tp->t_state == TCPS_SYN_SENT) 1736 tcp_timer_activate(tp, TT_KEEP, 1737 TP_KEEPINIT(tp)); 1738 break; 1739 } 1740 goto unlock_and_done; 1741 1742 case TCP_KEEPCNT: 1743 INP_WUNLOCK(inp); 1744 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1745 if (error) 1746 return (error); 1747 1748 INP_WLOCK_RECHECK(inp); 1749 tp->t_keepcnt = ui; 1750 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1751 (TP_MAXIDLE(tp) > 0)) 1752 tcp_timer_activate(tp, TT_2MSL, 1753 TP_MAXIDLE(tp)); 1754 goto unlock_and_done; 1755 1756 #ifdef TCPPCAP 1757 case TCP_PCAP_OUT: 1758 case TCP_PCAP_IN: 1759 INP_WUNLOCK(inp); 1760 error = sooptcopyin(sopt, &optval, sizeof optval, 1761 sizeof optval); 1762 if (error) 1763 return (error); 1764 1765 INP_WLOCK_RECHECK(inp); 1766 if (optval >= 0) 1767 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1768 &(tp->t_outpkts) : &(tp->t_inpkts), 1769 optval); 1770 else 1771 error = EINVAL; 1772 goto unlock_and_done; 1773 #endif 1774 1775 case TCP_FASTOPEN: { 1776 struct tcp_fastopen tfo_optval; 1777 1778 INP_WUNLOCK(inp); 1779 if (!V_tcp_fastopen_client_enable && 1780 !V_tcp_fastopen_server_enable) 1781 return (EPERM); 1782 1783 error = sooptcopyin(sopt, &tfo_optval, 1784 sizeof(tfo_optval), sizeof(int)); 1785 if (error) 1786 return (error); 1787 1788 INP_WLOCK_RECHECK(inp); 1789 if (tfo_optval.enable) { 1790 if (tp->t_state == TCPS_LISTEN) { 1791 if (!V_tcp_fastopen_server_enable) { 1792 error = EPERM; 1793 goto unlock_and_done; 1794 } 1795 1796 tp->t_flags |= TF_FASTOPEN; 1797 if (tp->t_tfo_pending == NULL) 1798 tp->t_tfo_pending = 1799 tcp_fastopen_alloc_counter(); 1800 } else { 1801 /* 1802 * If a pre-shared key was provided, 1803 * stash it in the client cookie 1804 * field of the tcpcb for use during 1805 * connect. 1806 */ 1807 if (sopt->sopt_valsize == 1808 sizeof(tfo_optval)) { 1809 memcpy(tp->t_tfo_cookie.client, 1810 tfo_optval.psk, 1811 TCP_FASTOPEN_PSK_LEN); 1812 tp->t_tfo_client_cookie_len = 1813 TCP_FASTOPEN_PSK_LEN; 1814 } 1815 tp->t_flags |= TF_FASTOPEN; 1816 } 1817 } else 1818 tp->t_flags &= ~TF_FASTOPEN; 1819 goto unlock_and_done; 1820 } 1821 1822 default: 1823 INP_WUNLOCK(inp); 1824 error = ENOPROTOOPT; 1825 break; 1826 } 1827 break; 1828 1829 case SOPT_GET: 1830 tp = intotcpcb(inp); 1831 switch (sopt->sopt_name) { 1832 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1833 case TCP_MD5SIG: 1834 if (!TCPMD5_ENABLED()) { 1835 INP_WUNLOCK(inp); 1836 return (ENOPROTOOPT); 1837 } 1838 error = TCPMD5_PCBCTL(inp, sopt); 1839 break; 1840 #endif 1841 1842 case TCP_NODELAY: 1843 optval = tp->t_flags & TF_NODELAY; 1844 INP_WUNLOCK(inp); 1845 error = sooptcopyout(sopt, &optval, sizeof optval); 1846 break; 1847 case TCP_MAXSEG: 1848 optval = tp->t_maxseg; 1849 INP_WUNLOCK(inp); 1850 error = sooptcopyout(sopt, &optval, sizeof optval); 1851 break; 1852 case TCP_NOOPT: 1853 optval = tp->t_flags & TF_NOOPT; 1854 INP_WUNLOCK(inp); 1855 error = sooptcopyout(sopt, &optval, sizeof optval); 1856 break; 1857 case TCP_NOPUSH: 1858 optval = tp->t_flags & TF_NOPUSH; 1859 INP_WUNLOCK(inp); 1860 error = sooptcopyout(sopt, &optval, sizeof optval); 1861 break; 1862 case TCP_INFO: 1863 tcp_fill_info(tp, &ti); 1864 INP_WUNLOCK(inp); 1865 error = sooptcopyout(sopt, &ti, sizeof ti); 1866 break; 1867 case TCP_CONGESTION: 1868 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1869 INP_WUNLOCK(inp); 1870 error = sooptcopyout(sopt, buf, len + 1); 1871 break; 1872 case TCP_KEEPIDLE: 1873 case TCP_KEEPINTVL: 1874 case TCP_KEEPINIT: 1875 case TCP_KEEPCNT: 1876 switch (sopt->sopt_name) { 1877 case TCP_KEEPIDLE: 1878 ui = TP_KEEPIDLE(tp) / hz; 1879 break; 1880 case TCP_KEEPINTVL: 1881 ui = TP_KEEPINTVL(tp) / hz; 1882 break; 1883 case TCP_KEEPINIT: 1884 ui = TP_KEEPINIT(tp) / hz; 1885 break; 1886 case TCP_KEEPCNT: 1887 ui = TP_KEEPCNT(tp); 1888 break; 1889 } 1890 INP_WUNLOCK(inp); 1891 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1892 break; 1893 #ifdef TCPPCAP 1894 case TCP_PCAP_OUT: 1895 case TCP_PCAP_IN: 1896 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1897 &(tp->t_outpkts) : &(tp->t_inpkts)); 1898 INP_WUNLOCK(inp); 1899 error = sooptcopyout(sopt, &optval, sizeof optval); 1900 break; 1901 #endif 1902 case TCP_FASTOPEN: 1903 optval = tp->t_flags & TF_FASTOPEN; 1904 INP_WUNLOCK(inp); 1905 error = sooptcopyout(sopt, &optval, sizeof optval); 1906 break; 1907 default: 1908 INP_WUNLOCK(inp); 1909 error = ENOPROTOOPT; 1910 break; 1911 } 1912 break; 1913 } 1914 return (error); 1915 } 1916 #undef INP_WLOCK_RECHECK 1917 #undef INP_WLOCK_RECHECK_CLEANUP 1918 1919 /* 1920 * Attach TCP protocol to socket, allocating 1921 * internet protocol control block, tcp control block, 1922 * bufer space, and entering LISTEN state if to accept connections. 1923 */ 1924 static int 1925 tcp_attach(struct socket *so) 1926 { 1927 struct tcpcb *tp; 1928 struct inpcb *inp; 1929 int error; 1930 1931 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1932 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1933 if (error) 1934 return (error); 1935 } 1936 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1937 so->so_snd.sb_flags |= SB_AUTOSIZE; 1938 INP_INFO_RLOCK(&V_tcbinfo); 1939 error = in_pcballoc(so, &V_tcbinfo); 1940 if (error) { 1941 INP_INFO_RUNLOCK(&V_tcbinfo); 1942 return (error); 1943 } 1944 inp = sotoinpcb(so); 1945 #ifdef INET6 1946 if (inp->inp_vflag & INP_IPV6PROTO) { 1947 inp->inp_vflag |= INP_IPV6; 1948 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1949 inp->inp_vflag |= INP_IPV4; 1950 inp->in6p_hops = -1; /* use kernel default */ 1951 } 1952 else 1953 #endif 1954 inp->inp_vflag |= INP_IPV4; 1955 tp = tcp_newtcpcb(inp); 1956 if (tp == NULL) { 1957 in_pcbdetach(inp); 1958 in_pcbfree(inp); 1959 INP_INFO_RUNLOCK(&V_tcbinfo); 1960 return (ENOBUFS); 1961 } 1962 tp->t_state = TCPS_CLOSED; 1963 INP_WUNLOCK(inp); 1964 INP_INFO_RUNLOCK(&V_tcbinfo); 1965 TCPSTATES_INC(TCPS_CLOSED); 1966 return (0); 1967 } 1968 1969 /* 1970 * Initiate (or continue) disconnect. 1971 * If embryonic state, just send reset (once). 1972 * If in ``let data drain'' option and linger null, just drop. 1973 * Otherwise (hard), mark socket disconnecting and drop 1974 * current input data; switch states based on user close, and 1975 * send segment to peer (with FIN). 1976 */ 1977 static void 1978 tcp_disconnect(struct tcpcb *tp) 1979 { 1980 struct inpcb *inp = tp->t_inpcb; 1981 struct socket *so = inp->inp_socket; 1982 1983 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1984 INP_WLOCK_ASSERT(inp); 1985 1986 /* 1987 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1988 * socket is still open. 1989 */ 1990 if (tp->t_state < TCPS_ESTABLISHED) { 1991 tp = tcp_close(tp); 1992 KASSERT(tp != NULL, 1993 ("tcp_disconnect: tcp_close() returned NULL")); 1994 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1995 tp = tcp_drop(tp, 0); 1996 KASSERT(tp != NULL, 1997 ("tcp_disconnect: tcp_drop() returned NULL")); 1998 } else { 1999 soisdisconnecting(so); 2000 sbflush(&so->so_rcv); 2001 tcp_usrclosed(tp); 2002 if (!(inp->inp_flags & INP_DROPPED)) 2003 tp->t_fb->tfb_tcp_output(tp); 2004 } 2005 } 2006 2007 /* 2008 * User issued close, and wish to trail through shutdown states: 2009 * if never received SYN, just forget it. If got a SYN from peer, 2010 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2011 * If already got a FIN from peer, then almost done; go to LAST_ACK 2012 * state. In all other cases, have already sent FIN to peer (e.g. 2013 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2014 * for peer to send FIN or not respond to keep-alives, etc. 2015 * We can let the user exit from the close as soon as the FIN is acked. 2016 */ 2017 static void 2018 tcp_usrclosed(struct tcpcb *tp) 2019 { 2020 2021 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 2022 INP_WLOCK_ASSERT(tp->t_inpcb); 2023 2024 switch (tp->t_state) { 2025 case TCPS_LISTEN: 2026 #ifdef TCP_OFFLOAD 2027 tcp_offload_listen_stop(tp); 2028 #endif 2029 tcp_state_change(tp, TCPS_CLOSED); 2030 /* FALLTHROUGH */ 2031 case TCPS_CLOSED: 2032 tp = tcp_close(tp); 2033 /* 2034 * tcp_close() should never return NULL here as the socket is 2035 * still open. 2036 */ 2037 KASSERT(tp != NULL, 2038 ("tcp_usrclosed: tcp_close() returned NULL")); 2039 break; 2040 2041 case TCPS_SYN_SENT: 2042 case TCPS_SYN_RECEIVED: 2043 tp->t_flags |= TF_NEEDFIN; 2044 break; 2045 2046 case TCPS_ESTABLISHED: 2047 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2048 break; 2049 2050 case TCPS_CLOSE_WAIT: 2051 tcp_state_change(tp, TCPS_LAST_ACK); 2052 break; 2053 } 2054 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2055 soisdisconnected(tp->t_inpcb->inp_socket); 2056 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2057 if (tp->t_state == TCPS_FIN_WAIT_2) { 2058 int timeout; 2059 2060 timeout = (tcp_fast_finwait2_recycle) ? 2061 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2062 tcp_timer_activate(tp, TT_2MSL, timeout); 2063 } 2064 } 2065 } 2066 2067 #ifdef DDB 2068 static void 2069 db_print_indent(int indent) 2070 { 2071 int i; 2072 2073 for (i = 0; i < indent; i++) 2074 db_printf(" "); 2075 } 2076 2077 static void 2078 db_print_tstate(int t_state) 2079 { 2080 2081 switch (t_state) { 2082 case TCPS_CLOSED: 2083 db_printf("TCPS_CLOSED"); 2084 return; 2085 2086 case TCPS_LISTEN: 2087 db_printf("TCPS_LISTEN"); 2088 return; 2089 2090 case TCPS_SYN_SENT: 2091 db_printf("TCPS_SYN_SENT"); 2092 return; 2093 2094 case TCPS_SYN_RECEIVED: 2095 db_printf("TCPS_SYN_RECEIVED"); 2096 return; 2097 2098 case TCPS_ESTABLISHED: 2099 db_printf("TCPS_ESTABLISHED"); 2100 return; 2101 2102 case TCPS_CLOSE_WAIT: 2103 db_printf("TCPS_CLOSE_WAIT"); 2104 return; 2105 2106 case TCPS_FIN_WAIT_1: 2107 db_printf("TCPS_FIN_WAIT_1"); 2108 return; 2109 2110 case TCPS_CLOSING: 2111 db_printf("TCPS_CLOSING"); 2112 return; 2113 2114 case TCPS_LAST_ACK: 2115 db_printf("TCPS_LAST_ACK"); 2116 return; 2117 2118 case TCPS_FIN_WAIT_2: 2119 db_printf("TCPS_FIN_WAIT_2"); 2120 return; 2121 2122 case TCPS_TIME_WAIT: 2123 db_printf("TCPS_TIME_WAIT"); 2124 return; 2125 2126 default: 2127 db_printf("unknown"); 2128 return; 2129 } 2130 } 2131 2132 static void 2133 db_print_tflags(u_int t_flags) 2134 { 2135 int comma; 2136 2137 comma = 0; 2138 if (t_flags & TF_ACKNOW) { 2139 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2140 comma = 1; 2141 } 2142 if (t_flags & TF_DELACK) { 2143 db_printf("%sTF_DELACK", comma ? ", " : ""); 2144 comma = 1; 2145 } 2146 if (t_flags & TF_NODELAY) { 2147 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2148 comma = 1; 2149 } 2150 if (t_flags & TF_NOOPT) { 2151 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2152 comma = 1; 2153 } 2154 if (t_flags & TF_SENTFIN) { 2155 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2156 comma = 1; 2157 } 2158 if (t_flags & TF_REQ_SCALE) { 2159 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2160 comma = 1; 2161 } 2162 if (t_flags & TF_RCVD_SCALE) { 2163 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2164 comma = 1; 2165 } 2166 if (t_flags & TF_REQ_TSTMP) { 2167 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2168 comma = 1; 2169 } 2170 if (t_flags & TF_RCVD_TSTMP) { 2171 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2172 comma = 1; 2173 } 2174 if (t_flags & TF_SACK_PERMIT) { 2175 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2176 comma = 1; 2177 } 2178 if (t_flags & TF_NEEDSYN) { 2179 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2180 comma = 1; 2181 } 2182 if (t_flags & TF_NEEDFIN) { 2183 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2184 comma = 1; 2185 } 2186 if (t_flags & TF_NOPUSH) { 2187 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2188 comma = 1; 2189 } 2190 if (t_flags & TF_MORETOCOME) { 2191 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2192 comma = 1; 2193 } 2194 if (t_flags & TF_LQ_OVERFLOW) { 2195 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2196 comma = 1; 2197 } 2198 if (t_flags & TF_LASTIDLE) { 2199 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2200 comma = 1; 2201 } 2202 if (t_flags & TF_RXWIN0SENT) { 2203 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2204 comma = 1; 2205 } 2206 if (t_flags & TF_FASTRECOVERY) { 2207 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2208 comma = 1; 2209 } 2210 if (t_flags & TF_CONGRECOVERY) { 2211 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2212 comma = 1; 2213 } 2214 if (t_flags & TF_WASFRECOVERY) { 2215 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2216 comma = 1; 2217 } 2218 if (t_flags & TF_SIGNATURE) { 2219 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2220 comma = 1; 2221 } 2222 if (t_flags & TF_FORCEDATA) { 2223 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2224 comma = 1; 2225 } 2226 if (t_flags & TF_TSO) { 2227 db_printf("%sTF_TSO", comma ? ", " : ""); 2228 comma = 1; 2229 } 2230 if (t_flags & TF_ECN_PERMIT) { 2231 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2232 comma = 1; 2233 } 2234 if (t_flags & TF_FASTOPEN) { 2235 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2236 comma = 1; 2237 } 2238 } 2239 2240 static void 2241 db_print_toobflags(char t_oobflags) 2242 { 2243 int comma; 2244 2245 comma = 0; 2246 if (t_oobflags & TCPOOB_HAVEDATA) { 2247 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2248 comma = 1; 2249 } 2250 if (t_oobflags & TCPOOB_HADDATA) { 2251 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2252 comma = 1; 2253 } 2254 } 2255 2256 static void 2257 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2258 { 2259 2260 db_print_indent(indent); 2261 db_printf("%s at %p\n", name, tp); 2262 2263 indent += 2; 2264 2265 db_print_indent(indent); 2266 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2267 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2268 2269 db_print_indent(indent); 2270 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2271 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2272 2273 db_print_indent(indent); 2274 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2275 &tp->t_timers->tt_delack, tp->t_inpcb); 2276 2277 db_print_indent(indent); 2278 db_printf("t_state: %d (", tp->t_state); 2279 db_print_tstate(tp->t_state); 2280 db_printf(")\n"); 2281 2282 db_print_indent(indent); 2283 db_printf("t_flags: 0x%x (", tp->t_flags); 2284 db_print_tflags(tp->t_flags); 2285 db_printf(")\n"); 2286 2287 db_print_indent(indent); 2288 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2289 tp->snd_una, tp->snd_max, tp->snd_nxt); 2290 2291 db_print_indent(indent); 2292 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2293 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2294 2295 db_print_indent(indent); 2296 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2297 tp->iss, tp->irs, tp->rcv_nxt); 2298 2299 db_print_indent(indent); 2300 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2301 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2302 2303 db_print_indent(indent); 2304 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2305 tp->snd_wnd, tp->snd_cwnd); 2306 2307 db_print_indent(indent); 2308 db_printf("snd_ssthresh: %u snd_recover: " 2309 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2310 2311 db_print_indent(indent); 2312 db_printf("t_rcvtime: %u t_startime: %u\n", 2313 tp->t_rcvtime, tp->t_starttime); 2314 2315 db_print_indent(indent); 2316 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2317 tp->t_rtttime, tp->t_rtseq); 2318 2319 db_print_indent(indent); 2320 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2321 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2322 2323 db_print_indent(indent); 2324 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2325 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2326 tp->t_rttbest); 2327 2328 db_print_indent(indent); 2329 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2330 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2331 2332 db_print_indent(indent); 2333 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2334 db_print_toobflags(tp->t_oobflags); 2335 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2336 2337 db_print_indent(indent); 2338 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2339 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2340 2341 db_print_indent(indent); 2342 db_printf("ts_recent: %u ts_recent_age: %u\n", 2343 tp->ts_recent, tp->ts_recent_age); 2344 2345 db_print_indent(indent); 2346 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2347 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2348 2349 db_print_indent(indent); 2350 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2351 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2352 tp->snd_recover_prev, tp->t_badrxtwin); 2353 2354 db_print_indent(indent); 2355 db_printf("snd_numholes: %d snd_holes first: %p\n", 2356 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2357 2358 db_print_indent(indent); 2359 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2360 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2361 2362 /* Skip sackblks, sackhint. */ 2363 2364 db_print_indent(indent); 2365 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2366 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2367 } 2368 2369 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2370 { 2371 struct tcpcb *tp; 2372 2373 if (!have_addr) { 2374 db_printf("usage: show tcpcb <addr>\n"); 2375 return; 2376 } 2377 tp = (struct tcpcb *)addr; 2378 2379 db_print_tcpcb(tp, "tcpcb", 0); 2380 } 2381 #endif 2382