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 * 3. 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_ipsec.h" 45 #include "opt_tcpdebug.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/limits.h> 50 #include <sys/malloc.h> 51 #include <sys/refcount.h> 52 #include <sys/kernel.h> 53 #include <sys/sysctl.h> 54 #include <sys/mbuf.h> 55 #ifdef INET6 56 #include <sys/domain.h> 57 #endif /* INET6 */ 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/protosw.h> 61 #include <sys/proc.h> 62 #include <sys/jail.h> 63 #include <sys/syslog.h> 64 65 #ifdef DDB 66 #include <ddb/ddb.h> 67 #endif 68 69 #include <net/if.h> 70 #include <net/if_var.h> 71 #include <net/route.h> 72 #include <net/vnet.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_kdtrace.h> 76 #include <netinet/in_pcb.h> 77 #include <netinet/in_systm.h> 78 #include <netinet/in_var.h> 79 #include <netinet/ip_var.h> 80 #ifdef INET6 81 #include <netinet/ip6.h> 82 #include <netinet6/in6_pcb.h> 83 #include <netinet6/ip6_var.h> 84 #include <netinet6/scope6_var.h> 85 #endif 86 #ifdef TCP_RFC7413 87 #include <netinet/tcp_fastopen.h> 88 #endif 89 #include <netinet/tcp.h> 90 #include <netinet/tcp_fsm.h> 91 #include <netinet/tcp_seq.h> 92 #include <netinet/tcp_timer.h> 93 #include <netinet/tcp_var.h> 94 #include <netinet/tcpip.h> 95 #include <netinet/cc/cc.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 #ifdef TCP_RFC7413 432 if (IS_FASTOPEN(tp->t_flags)) 433 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 434 #endif 435 out: 436 TCPDEBUG2(PRU_LISTEN); 437 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 438 INP_WUNLOCK(inp); 439 return (error); 440 } 441 #endif /* INET */ 442 443 #ifdef INET6 444 static int 445 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 446 { 447 int error = 0; 448 struct inpcb *inp; 449 struct tcpcb *tp = NULL; 450 451 TCPDEBUG0; 452 inp = sotoinpcb(so); 453 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 454 INP_WLOCK(inp); 455 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 456 error = EINVAL; 457 goto out; 458 } 459 tp = intotcpcb(inp); 460 TCPDEBUG1(); 461 SOCK_LOCK(so); 462 error = solisten_proto_check(so); 463 INP_HASH_WLOCK(&V_tcbinfo); 464 if (error == 0 && inp->inp_lport == 0) { 465 inp->inp_vflag &= ~INP_IPV4; 466 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 467 inp->inp_vflag |= INP_IPV4; 468 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 469 } 470 INP_HASH_WUNLOCK(&V_tcbinfo); 471 if (error == 0) { 472 tcp_state_change(tp, TCPS_LISTEN); 473 solisten_proto(so, backlog); 474 #ifdef TCP_OFFLOAD 475 if ((so->so_options & SO_NO_OFFLOAD) == 0) 476 tcp_offload_listen_start(tp); 477 #endif 478 } 479 SOCK_UNLOCK(so); 480 481 #ifdef TCP_RFC7413 482 if (IS_FASTOPEN(tp->t_flags)) 483 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 484 #endif 485 out: 486 TCPDEBUG2(PRU_LISTEN); 487 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 488 INP_WUNLOCK(inp); 489 return (error); 490 } 491 #endif /* INET6 */ 492 493 #ifdef INET 494 /* 495 * Initiate connection to peer. 496 * Create a template for use in transmissions on this connection. 497 * Enter SYN_SENT state, and mark socket as connecting. 498 * Start keep-alive timer, and seed output sequence space. 499 * Send initial segment on connection. 500 */ 501 static int 502 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 503 { 504 int error = 0; 505 struct inpcb *inp; 506 struct tcpcb *tp = NULL; 507 struct sockaddr_in *sinp; 508 509 sinp = (struct sockaddr_in *)nam; 510 if (nam->sa_len != sizeof (*sinp)) 511 return (EINVAL); 512 /* 513 * Must disallow TCP ``connections'' to multicast addresses. 514 */ 515 if (sinp->sin_family == AF_INET 516 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 517 return (EAFNOSUPPORT); 518 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 519 return (error); 520 521 TCPDEBUG0; 522 inp = sotoinpcb(so); 523 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 524 INP_WLOCK(inp); 525 if (inp->inp_flags & INP_TIMEWAIT) { 526 error = EADDRINUSE; 527 goto out; 528 } 529 if (inp->inp_flags & INP_DROPPED) { 530 error = ECONNREFUSED; 531 goto out; 532 } 533 tp = intotcpcb(inp); 534 TCPDEBUG1(); 535 if ((error = tcp_connect(tp, nam, td)) != 0) 536 goto out; 537 #ifdef TCP_OFFLOAD 538 if (registered_toedevs > 0 && 539 (so->so_options & SO_NO_OFFLOAD) == 0 && 540 (error = tcp_offload_connect(so, nam)) == 0) 541 goto out; 542 #endif 543 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 544 error = tp->t_fb->tfb_tcp_output(tp); 545 out: 546 TCPDEBUG2(PRU_CONNECT); 547 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 548 INP_WUNLOCK(inp); 549 return (error); 550 } 551 #endif /* INET */ 552 553 #ifdef INET6 554 static int 555 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 556 { 557 int error = 0; 558 struct inpcb *inp; 559 struct tcpcb *tp = NULL; 560 struct sockaddr_in6 *sin6p; 561 562 TCPDEBUG0; 563 564 sin6p = (struct sockaddr_in6 *)nam; 565 if (nam->sa_len != sizeof (*sin6p)) 566 return (EINVAL); 567 /* 568 * Must disallow TCP ``connections'' to multicast addresses. 569 */ 570 if (sin6p->sin6_family == AF_INET6 571 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 572 return (EAFNOSUPPORT); 573 574 inp = sotoinpcb(so); 575 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 576 INP_WLOCK(inp); 577 if (inp->inp_flags & INP_TIMEWAIT) { 578 error = EADDRINUSE; 579 goto out; 580 } 581 if (inp->inp_flags & INP_DROPPED) { 582 error = ECONNREFUSED; 583 goto out; 584 } 585 tp = intotcpcb(inp); 586 TCPDEBUG1(); 587 #ifdef INET 588 /* 589 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 590 * therefore probably require the hash lock, which isn't held here. 591 * Is this a significant problem? 592 */ 593 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 594 struct sockaddr_in sin; 595 596 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 597 error = EINVAL; 598 goto out; 599 } 600 601 in6_sin6_2_sin(&sin, sin6p); 602 inp->inp_vflag |= INP_IPV4; 603 inp->inp_vflag &= ~INP_IPV6; 604 if ((error = prison_remote_ip4(td->td_ucred, 605 &sin.sin_addr)) != 0) 606 goto out; 607 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 608 goto out; 609 #ifdef TCP_OFFLOAD 610 if (registered_toedevs > 0 && 611 (so->so_options & SO_NO_OFFLOAD) == 0 && 612 (error = tcp_offload_connect(so, nam)) == 0) 613 goto out; 614 #endif 615 error = tp->t_fb->tfb_tcp_output(tp); 616 goto out; 617 } 618 #endif 619 inp->inp_vflag &= ~INP_IPV4; 620 inp->inp_vflag |= INP_IPV6; 621 inp->inp_inc.inc_flags |= INC_ISIPV6; 622 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 623 goto out; 624 if ((error = tcp6_connect(tp, nam, td)) != 0) 625 goto out; 626 #ifdef TCP_OFFLOAD 627 if (registered_toedevs > 0 && 628 (so->so_options & SO_NO_OFFLOAD) == 0 && 629 (error = tcp_offload_connect(so, nam)) == 0) 630 goto out; 631 #endif 632 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 633 error = tp->t_fb->tfb_tcp_output(tp); 634 635 out: 636 TCPDEBUG2(PRU_CONNECT); 637 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 638 INP_WUNLOCK(inp); 639 return (error); 640 } 641 #endif /* INET6 */ 642 643 /* 644 * Initiate disconnect from peer. 645 * If connection never passed embryonic stage, just drop; 646 * else if don't need to let data drain, then can just drop anyways, 647 * else have to begin TCP shutdown process: mark socket disconnecting, 648 * drain unread data, state switch to reflect user close, and 649 * send segment (e.g. FIN) to peer. Socket will be really disconnected 650 * when peer sends FIN and acks ours. 651 * 652 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 653 */ 654 static int 655 tcp_usr_disconnect(struct socket *so) 656 { 657 struct inpcb *inp; 658 struct tcpcb *tp = NULL; 659 int error = 0; 660 661 TCPDEBUG0; 662 INP_INFO_RLOCK(&V_tcbinfo); 663 inp = sotoinpcb(so); 664 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 665 INP_WLOCK(inp); 666 if (inp->inp_flags & INP_TIMEWAIT) 667 goto out; 668 if (inp->inp_flags & INP_DROPPED) { 669 error = ECONNRESET; 670 goto out; 671 } 672 tp = intotcpcb(inp); 673 TCPDEBUG1(); 674 tcp_disconnect(tp); 675 out: 676 TCPDEBUG2(PRU_DISCONNECT); 677 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 678 INP_WUNLOCK(inp); 679 INP_INFO_RUNLOCK(&V_tcbinfo); 680 return (error); 681 } 682 683 #ifdef INET 684 /* 685 * Accept a connection. Essentially all the work is done at higher levels; 686 * just return the address of the peer, storing through addr. 687 */ 688 static int 689 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 690 { 691 int error = 0; 692 struct inpcb *inp = NULL; 693 struct tcpcb *tp = NULL; 694 struct in_addr addr; 695 in_port_t port = 0; 696 TCPDEBUG0; 697 698 if (so->so_state & SS_ISDISCONNECTED) 699 return (ECONNABORTED); 700 701 inp = sotoinpcb(so); 702 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 703 INP_WLOCK(inp); 704 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 705 error = ECONNABORTED; 706 goto out; 707 } 708 tp = intotcpcb(inp); 709 TCPDEBUG1(); 710 711 /* 712 * We inline in_getpeeraddr and COMMON_END here, so that we can 713 * copy the data of interest and defer the malloc until after we 714 * release the lock. 715 */ 716 port = inp->inp_fport; 717 addr = inp->inp_faddr; 718 719 out: 720 TCPDEBUG2(PRU_ACCEPT); 721 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 722 INP_WUNLOCK(inp); 723 if (error == 0) 724 *nam = in_sockaddr(port, &addr); 725 return error; 726 } 727 #endif /* INET */ 728 729 #ifdef INET6 730 static int 731 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 732 { 733 struct inpcb *inp = NULL; 734 int error = 0; 735 struct tcpcb *tp = NULL; 736 struct in_addr addr; 737 struct in6_addr addr6; 738 in_port_t port = 0; 739 int v4 = 0; 740 TCPDEBUG0; 741 742 if (so->so_state & SS_ISDISCONNECTED) 743 return (ECONNABORTED); 744 745 inp = sotoinpcb(so); 746 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 747 INP_INFO_RLOCK(&V_tcbinfo); 748 INP_WLOCK(inp); 749 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 750 error = ECONNABORTED; 751 goto out; 752 } 753 tp = intotcpcb(inp); 754 TCPDEBUG1(); 755 756 /* 757 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 758 * copy the data of interest and defer the malloc until after we 759 * release the lock. 760 */ 761 if (inp->inp_vflag & INP_IPV4) { 762 v4 = 1; 763 port = inp->inp_fport; 764 addr = inp->inp_faddr; 765 } else { 766 port = inp->inp_fport; 767 addr6 = inp->in6p_faddr; 768 } 769 770 out: 771 TCPDEBUG2(PRU_ACCEPT); 772 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 773 INP_WUNLOCK(inp); 774 INP_INFO_RUNLOCK(&V_tcbinfo); 775 if (error == 0) { 776 if (v4) 777 *nam = in6_v4mapsin6_sockaddr(port, &addr); 778 else 779 *nam = in6_sockaddr(port, &addr6); 780 } 781 return error; 782 } 783 #endif /* INET6 */ 784 785 /* 786 * Mark the connection as being incapable of further output. 787 */ 788 static int 789 tcp_usr_shutdown(struct socket *so) 790 { 791 int error = 0; 792 struct inpcb *inp; 793 struct tcpcb *tp = NULL; 794 795 TCPDEBUG0; 796 INP_INFO_RLOCK(&V_tcbinfo); 797 inp = sotoinpcb(so); 798 KASSERT(inp != NULL, ("inp == NULL")); 799 INP_WLOCK(inp); 800 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 801 error = ECONNRESET; 802 goto out; 803 } 804 tp = intotcpcb(inp); 805 TCPDEBUG1(); 806 socantsendmore(so); 807 tcp_usrclosed(tp); 808 if (!(inp->inp_flags & INP_DROPPED)) 809 error = tp->t_fb->tfb_tcp_output(tp); 810 811 out: 812 TCPDEBUG2(PRU_SHUTDOWN); 813 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 814 INP_WUNLOCK(inp); 815 INP_INFO_RUNLOCK(&V_tcbinfo); 816 817 return (error); 818 } 819 820 /* 821 * After a receive, possibly send window update to peer. 822 */ 823 static int 824 tcp_usr_rcvd(struct socket *so, int flags) 825 { 826 struct inpcb *inp; 827 struct tcpcb *tp = NULL; 828 int error = 0; 829 830 TCPDEBUG0; 831 inp = sotoinpcb(so); 832 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 833 INP_WLOCK(inp); 834 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 835 error = ECONNRESET; 836 goto out; 837 } 838 tp = intotcpcb(inp); 839 TCPDEBUG1(); 840 #ifdef TCP_RFC7413 841 /* 842 * For passively-created TFO connections, don't attempt a window 843 * update while still in SYN_RECEIVED as this may trigger an early 844 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 845 * application response data, or failing that, when the DELACK timer 846 * expires. 847 */ 848 if (IS_FASTOPEN(tp->t_flags) && 849 (tp->t_state == TCPS_SYN_RECEIVED)) 850 goto out; 851 #endif 852 #ifdef TCP_OFFLOAD 853 if (tp->t_flags & TF_TOE) 854 tcp_offload_rcvd(tp); 855 else 856 #endif 857 tp->t_fb->tfb_tcp_output(tp); 858 859 out: 860 TCPDEBUG2(PRU_RCVD); 861 TCP_PROBE2(debug__user, tp, PRU_RCVD); 862 INP_WUNLOCK(inp); 863 return (error); 864 } 865 866 /* 867 * Do a send by putting data in output queue and updating urgent 868 * marker if URG set. Possibly send more data. Unlike the other 869 * pru_*() routines, the mbuf chains are our responsibility. We 870 * must either enqueue them or free them. The other pru_* routines 871 * generally are caller-frees. 872 */ 873 static int 874 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 875 struct sockaddr *nam, struct mbuf *control, struct thread *td) 876 { 877 int error = 0; 878 struct inpcb *inp; 879 struct tcpcb *tp = NULL; 880 #ifdef INET6 881 int isipv6; 882 #endif 883 TCPDEBUG0; 884 885 /* 886 * We require the pcbinfo lock if we will close the socket as part of 887 * this call. 888 */ 889 if (flags & PRUS_EOF) 890 INP_INFO_RLOCK(&V_tcbinfo); 891 inp = sotoinpcb(so); 892 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 893 INP_WLOCK(inp); 894 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 895 if (control) 896 m_freem(control); 897 /* 898 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 899 * for freeing memory. 900 */ 901 if (m && (flags & PRUS_NOTREADY) == 0) 902 m_freem(m); 903 error = ECONNRESET; 904 goto out; 905 } 906 #ifdef INET6 907 isipv6 = nam && nam->sa_family == AF_INET6; 908 #endif /* INET6 */ 909 tp = intotcpcb(inp); 910 TCPDEBUG1(); 911 if (control) { 912 /* TCP doesn't do control messages (rights, creds, etc) */ 913 if (control->m_len) { 914 m_freem(control); 915 if (m) 916 m_freem(m); 917 error = EINVAL; 918 goto out; 919 } 920 m_freem(control); /* empty control, just free it */ 921 } 922 if (!(flags & PRUS_OOB)) { 923 sbappendstream(&so->so_snd, m, flags); 924 if (nam && tp->t_state < TCPS_SYN_SENT) { 925 /* 926 * Do implied connect if not yet connected, 927 * initialize window to default value, and 928 * initialize maxseg using peer's cached MSS. 929 */ 930 #ifdef INET6 931 if (isipv6) 932 error = tcp6_connect(tp, nam, td); 933 #endif /* INET6 */ 934 #if defined(INET6) && defined(INET) 935 else 936 #endif 937 #ifdef INET 938 error = tcp_connect(tp, nam, td); 939 #endif 940 if (error) 941 goto out; 942 tp->snd_wnd = TTCP_CLIENT_SND_WND; 943 tcp_mss(tp, -1); 944 } 945 if (flags & PRUS_EOF) { 946 /* 947 * Close the send side of the connection after 948 * the data is sent. 949 */ 950 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 951 socantsendmore(so); 952 tcp_usrclosed(tp); 953 } 954 if (!(inp->inp_flags & INP_DROPPED) && 955 !(flags & PRUS_NOTREADY)) { 956 if (flags & PRUS_MORETOCOME) 957 tp->t_flags |= TF_MORETOCOME; 958 error = tp->t_fb->tfb_tcp_output(tp); 959 if (flags & PRUS_MORETOCOME) 960 tp->t_flags &= ~TF_MORETOCOME; 961 } 962 } else { 963 /* 964 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 965 */ 966 SOCKBUF_LOCK(&so->so_snd); 967 if (sbspace(&so->so_snd) < -512) { 968 SOCKBUF_UNLOCK(&so->so_snd); 969 m_freem(m); 970 error = ENOBUFS; 971 goto out; 972 } 973 /* 974 * According to RFC961 (Assigned Protocols), 975 * the urgent pointer points to the last octet 976 * of urgent data. We continue, however, 977 * to consider it to indicate the first octet 978 * of data past the urgent section. 979 * Otherwise, snd_up should be one lower. 980 */ 981 sbappendstream_locked(&so->so_snd, m, flags); 982 SOCKBUF_UNLOCK(&so->so_snd); 983 if (nam && tp->t_state < TCPS_SYN_SENT) { 984 /* 985 * Do implied connect if not yet connected, 986 * initialize window to default value, and 987 * initialize maxseg using peer's cached MSS. 988 */ 989 #ifdef INET6 990 if (isipv6) 991 error = tcp6_connect(tp, nam, td); 992 #endif /* INET6 */ 993 #if defined(INET6) && defined(INET) 994 else 995 #endif 996 #ifdef INET 997 error = tcp_connect(tp, nam, td); 998 #endif 999 if (error) 1000 goto out; 1001 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1002 tcp_mss(tp, -1); 1003 } 1004 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1005 if (!(flags & PRUS_NOTREADY)) { 1006 tp->t_flags |= TF_FORCEDATA; 1007 error = tp->t_fb->tfb_tcp_output(tp); 1008 tp->t_flags &= ~TF_FORCEDATA; 1009 } 1010 } 1011 out: 1012 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1013 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1014 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1015 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1016 INP_WUNLOCK(inp); 1017 if (flags & PRUS_EOF) 1018 INP_INFO_RUNLOCK(&V_tcbinfo); 1019 return (error); 1020 } 1021 1022 static int 1023 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1024 { 1025 struct inpcb *inp; 1026 struct tcpcb *tp; 1027 int error; 1028 1029 inp = sotoinpcb(so); 1030 INP_WLOCK(inp); 1031 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1032 INP_WUNLOCK(inp); 1033 for (int i = 0; i < count; i++) 1034 m = m_free(m); 1035 return (ECONNRESET); 1036 } 1037 tp = intotcpcb(inp); 1038 1039 SOCKBUF_LOCK(&so->so_snd); 1040 error = sbready(&so->so_snd, m, count); 1041 SOCKBUF_UNLOCK(&so->so_snd); 1042 if (error == 0) 1043 error = tp->t_fb->tfb_tcp_output(tp); 1044 INP_WUNLOCK(inp); 1045 1046 return (error); 1047 } 1048 1049 /* 1050 * Abort the TCP. Drop the connection abruptly. 1051 */ 1052 static void 1053 tcp_usr_abort(struct socket *so) 1054 { 1055 struct inpcb *inp; 1056 struct tcpcb *tp = NULL; 1057 TCPDEBUG0; 1058 1059 inp = sotoinpcb(so); 1060 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1061 1062 INP_INFO_RLOCK(&V_tcbinfo); 1063 INP_WLOCK(inp); 1064 KASSERT(inp->inp_socket != NULL, 1065 ("tcp_usr_abort: inp_socket == NULL")); 1066 1067 /* 1068 * If we still have full TCP state, and we're not dropped, drop. 1069 */ 1070 if (!(inp->inp_flags & INP_TIMEWAIT) && 1071 !(inp->inp_flags & INP_DROPPED)) { 1072 tp = intotcpcb(inp); 1073 TCPDEBUG1(); 1074 tcp_drop(tp, ECONNABORTED); 1075 TCPDEBUG2(PRU_ABORT); 1076 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1077 } 1078 if (!(inp->inp_flags & INP_DROPPED)) { 1079 SOCK_LOCK(so); 1080 so->so_state |= SS_PROTOREF; 1081 SOCK_UNLOCK(so); 1082 inp->inp_flags |= INP_SOCKREF; 1083 } 1084 INP_WUNLOCK(inp); 1085 INP_INFO_RUNLOCK(&V_tcbinfo); 1086 } 1087 1088 /* 1089 * TCP socket is closed. Start friendly disconnect. 1090 */ 1091 static void 1092 tcp_usr_close(struct socket *so) 1093 { 1094 struct inpcb *inp; 1095 struct tcpcb *tp = NULL; 1096 TCPDEBUG0; 1097 1098 inp = sotoinpcb(so); 1099 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1100 1101 INP_INFO_RLOCK(&V_tcbinfo); 1102 INP_WLOCK(inp); 1103 KASSERT(inp->inp_socket != NULL, 1104 ("tcp_usr_close: inp_socket == NULL")); 1105 1106 /* 1107 * If we still have full TCP state, and we're not dropped, initiate 1108 * a disconnect. 1109 */ 1110 if (!(inp->inp_flags & INP_TIMEWAIT) && 1111 !(inp->inp_flags & INP_DROPPED)) { 1112 tp = intotcpcb(inp); 1113 TCPDEBUG1(); 1114 tcp_disconnect(tp); 1115 TCPDEBUG2(PRU_CLOSE); 1116 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1117 } 1118 if (!(inp->inp_flags & INP_DROPPED)) { 1119 SOCK_LOCK(so); 1120 so->so_state |= SS_PROTOREF; 1121 SOCK_UNLOCK(so); 1122 inp->inp_flags |= INP_SOCKREF; 1123 } 1124 INP_WUNLOCK(inp); 1125 INP_INFO_RUNLOCK(&V_tcbinfo); 1126 } 1127 1128 /* 1129 * Receive out-of-band data. 1130 */ 1131 static int 1132 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1133 { 1134 int error = 0; 1135 struct inpcb *inp; 1136 struct tcpcb *tp = NULL; 1137 1138 TCPDEBUG0; 1139 inp = sotoinpcb(so); 1140 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1141 INP_WLOCK(inp); 1142 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1143 error = ECONNRESET; 1144 goto out; 1145 } 1146 tp = intotcpcb(inp); 1147 TCPDEBUG1(); 1148 if ((so->so_oobmark == 0 && 1149 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1150 so->so_options & SO_OOBINLINE || 1151 tp->t_oobflags & TCPOOB_HADDATA) { 1152 error = EINVAL; 1153 goto out; 1154 } 1155 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1156 error = EWOULDBLOCK; 1157 goto out; 1158 } 1159 m->m_len = 1; 1160 *mtod(m, caddr_t) = tp->t_iobc; 1161 if ((flags & MSG_PEEK) == 0) 1162 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1163 1164 out: 1165 TCPDEBUG2(PRU_RCVOOB); 1166 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1167 INP_WUNLOCK(inp); 1168 return (error); 1169 } 1170 1171 #ifdef INET 1172 struct pr_usrreqs tcp_usrreqs = { 1173 .pru_abort = tcp_usr_abort, 1174 .pru_accept = tcp_usr_accept, 1175 .pru_attach = tcp_usr_attach, 1176 .pru_bind = tcp_usr_bind, 1177 .pru_connect = tcp_usr_connect, 1178 .pru_control = in_control, 1179 .pru_detach = tcp_usr_detach, 1180 .pru_disconnect = tcp_usr_disconnect, 1181 .pru_listen = tcp_usr_listen, 1182 .pru_peeraddr = in_getpeeraddr, 1183 .pru_rcvd = tcp_usr_rcvd, 1184 .pru_rcvoob = tcp_usr_rcvoob, 1185 .pru_send = tcp_usr_send, 1186 .pru_ready = tcp_usr_ready, 1187 .pru_shutdown = tcp_usr_shutdown, 1188 .pru_sockaddr = in_getsockaddr, 1189 .pru_sosetlabel = in_pcbsosetlabel, 1190 .pru_close = tcp_usr_close, 1191 }; 1192 #endif /* INET */ 1193 1194 #ifdef INET6 1195 struct pr_usrreqs tcp6_usrreqs = { 1196 .pru_abort = tcp_usr_abort, 1197 .pru_accept = tcp6_usr_accept, 1198 .pru_attach = tcp_usr_attach, 1199 .pru_bind = tcp6_usr_bind, 1200 .pru_connect = tcp6_usr_connect, 1201 .pru_control = in6_control, 1202 .pru_detach = tcp_usr_detach, 1203 .pru_disconnect = tcp_usr_disconnect, 1204 .pru_listen = tcp6_usr_listen, 1205 .pru_peeraddr = in6_mapped_peeraddr, 1206 .pru_rcvd = tcp_usr_rcvd, 1207 .pru_rcvoob = tcp_usr_rcvoob, 1208 .pru_send = tcp_usr_send, 1209 .pru_ready = tcp_usr_ready, 1210 .pru_shutdown = tcp_usr_shutdown, 1211 .pru_sockaddr = in6_mapped_sockaddr, 1212 .pru_sosetlabel = in_pcbsosetlabel, 1213 .pru_close = tcp_usr_close, 1214 }; 1215 #endif /* INET6 */ 1216 1217 #ifdef INET 1218 /* 1219 * Common subroutine to open a TCP connection to remote host specified 1220 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1221 * port number if needed. Call in_pcbconnect_setup to do the routing and 1222 * to choose a local host address (interface). If there is an existing 1223 * incarnation of the same connection in TIME-WAIT state and if the remote 1224 * host was sending CC options and if the connection duration was < MSL, then 1225 * truncate the previous TIME-WAIT state and proceed. 1226 * Initialize connection parameters and enter SYN-SENT state. 1227 */ 1228 static int 1229 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1230 { 1231 struct inpcb *inp = tp->t_inpcb, *oinp; 1232 struct socket *so = inp->inp_socket; 1233 struct in_addr laddr; 1234 u_short lport; 1235 int error; 1236 1237 INP_WLOCK_ASSERT(inp); 1238 INP_HASH_WLOCK(&V_tcbinfo); 1239 1240 if (inp->inp_lport == 0) { 1241 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1242 if (error) 1243 goto out; 1244 } 1245 1246 /* 1247 * Cannot simply call in_pcbconnect, because there might be an 1248 * earlier incarnation of this same connection still in 1249 * TIME_WAIT state, creating an ADDRINUSE error. 1250 */ 1251 laddr = inp->inp_laddr; 1252 lport = inp->inp_lport; 1253 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1254 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1255 if (error && oinp == NULL) 1256 goto out; 1257 if (oinp) { 1258 error = EADDRINUSE; 1259 goto out; 1260 } 1261 inp->inp_laddr = laddr; 1262 in_pcbrehash(inp); 1263 INP_HASH_WUNLOCK(&V_tcbinfo); 1264 1265 /* 1266 * Compute window scaling to request: 1267 * Scale to fit into sweet spot. See tcp_syncache.c. 1268 * XXX: This should move to tcp_output(). 1269 */ 1270 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1271 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1272 tp->request_r_scale++; 1273 1274 soisconnecting(so); 1275 TCPSTAT_INC(tcps_connattempt); 1276 tcp_state_change(tp, TCPS_SYN_SENT); 1277 tp->iss = tcp_new_isn(tp); 1278 tcp_sendseqinit(tp); 1279 1280 return 0; 1281 1282 out: 1283 INP_HASH_WUNLOCK(&V_tcbinfo); 1284 return (error); 1285 } 1286 #endif /* INET */ 1287 1288 #ifdef INET6 1289 static int 1290 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1291 { 1292 struct inpcb *inp = tp->t_inpcb; 1293 int error; 1294 1295 INP_WLOCK_ASSERT(inp); 1296 INP_HASH_WLOCK(&V_tcbinfo); 1297 1298 if (inp->inp_lport == 0) { 1299 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1300 if (error) 1301 goto out; 1302 } 1303 error = in6_pcbconnect(inp, nam, td->td_ucred); 1304 if (error != 0) 1305 goto out; 1306 INP_HASH_WUNLOCK(&V_tcbinfo); 1307 1308 /* Compute window scaling to request. */ 1309 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1310 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1311 tp->request_r_scale++; 1312 1313 soisconnecting(inp->inp_socket); 1314 TCPSTAT_INC(tcps_connattempt); 1315 tcp_state_change(tp, TCPS_SYN_SENT); 1316 tp->iss = tcp_new_isn(tp); 1317 tcp_sendseqinit(tp); 1318 1319 return 0; 1320 1321 out: 1322 INP_HASH_WUNLOCK(&V_tcbinfo); 1323 return error; 1324 } 1325 #endif /* INET6 */ 1326 1327 /* 1328 * Export TCP internal state information via a struct tcp_info, based on the 1329 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1330 * (TCP state machine, etc). We export all information using FreeBSD-native 1331 * constants -- for example, the numeric values for tcpi_state will differ 1332 * from Linux. 1333 */ 1334 static void 1335 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1336 { 1337 1338 INP_WLOCK_ASSERT(tp->t_inpcb); 1339 bzero(ti, sizeof(*ti)); 1340 1341 ti->tcpi_state = tp->t_state; 1342 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1343 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1344 if (tp->t_flags & TF_SACK_PERMIT) 1345 ti->tcpi_options |= TCPI_OPT_SACK; 1346 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1347 ti->tcpi_options |= TCPI_OPT_WSCALE; 1348 ti->tcpi_snd_wscale = tp->snd_scale; 1349 ti->tcpi_rcv_wscale = tp->rcv_scale; 1350 } 1351 if (tp->t_flags & TF_ECN_PERMIT) 1352 ti->tcpi_options |= TCPI_OPT_ECN; 1353 1354 ti->tcpi_rto = tp->t_rxtcur * tick; 1355 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1356 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1357 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1358 1359 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1360 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1361 1362 /* 1363 * FreeBSD-specific extension fields for tcp_info. 1364 */ 1365 ti->tcpi_rcv_space = tp->rcv_wnd; 1366 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1367 ti->tcpi_snd_wnd = tp->snd_wnd; 1368 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1369 ti->tcpi_snd_nxt = tp->snd_nxt; 1370 ti->tcpi_snd_mss = tp->t_maxseg; 1371 ti->tcpi_rcv_mss = tp->t_maxseg; 1372 if (tp->t_flags & TF_TOE) 1373 ti->tcpi_options |= TCPI_OPT_TOE; 1374 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1375 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1376 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1377 } 1378 1379 /* 1380 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1381 * socket option arguments. When it re-acquires the lock after the copy, it 1382 * has to revalidate that the connection is still valid for the socket 1383 * option. 1384 */ 1385 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1386 INP_WLOCK(inp); \ 1387 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1388 INP_WUNLOCK(inp); \ 1389 cleanup; \ 1390 return (ECONNRESET); \ 1391 } \ 1392 tp = intotcpcb(inp); \ 1393 } while(0) 1394 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1395 1396 int 1397 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1398 { 1399 int error; 1400 struct inpcb *inp; 1401 struct tcpcb *tp; 1402 struct tcp_function_block *blk; 1403 struct tcp_function_set fsn; 1404 1405 error = 0; 1406 inp = sotoinpcb(so); 1407 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1408 INP_WLOCK(inp); 1409 if (sopt->sopt_level != IPPROTO_TCP) { 1410 #ifdef INET6 1411 if (inp->inp_vflag & INP_IPV6PROTO) { 1412 INP_WUNLOCK(inp); 1413 error = ip6_ctloutput(so, sopt); 1414 } 1415 #endif /* INET6 */ 1416 #if defined(INET6) && defined(INET) 1417 else 1418 #endif 1419 #ifdef INET 1420 { 1421 INP_WUNLOCK(inp); 1422 error = ip_ctloutput(so, sopt); 1423 } 1424 #endif 1425 return (error); 1426 } 1427 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1428 INP_WUNLOCK(inp); 1429 return (ECONNRESET); 1430 } 1431 tp = intotcpcb(inp); 1432 /* 1433 * Protect the TCP option TCP_FUNCTION_BLK so 1434 * that a sub-function can *never* overwrite this. 1435 */ 1436 if ((sopt->sopt_dir == SOPT_SET) && 1437 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1438 INP_WUNLOCK(inp); 1439 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1440 sizeof fsn); 1441 if (error) 1442 return (error); 1443 INP_WLOCK_RECHECK(inp); 1444 blk = find_and_ref_tcp_functions(&fsn); 1445 if (blk == NULL) { 1446 INP_WUNLOCK(inp); 1447 return (ENOENT); 1448 } 1449 if (tp->t_fb == blk) { 1450 /* You already have this */ 1451 refcount_release(&blk->tfb_refcnt); 1452 INP_WUNLOCK(inp); 1453 return (0); 1454 } 1455 if (tp->t_state != TCPS_CLOSED) { 1456 int error=EINVAL; 1457 /* 1458 * The user has advanced the state 1459 * past the initial point, we may not 1460 * be able to switch. 1461 */ 1462 if (blk->tfb_tcp_handoff_ok != NULL) { 1463 /* 1464 * Does the stack provide a 1465 * query mechanism, if so it may 1466 * still be possible? 1467 */ 1468 error = (*blk->tfb_tcp_handoff_ok)(tp); 1469 } 1470 if (error) { 1471 refcount_release(&blk->tfb_refcnt); 1472 INP_WUNLOCK(inp); 1473 return(error); 1474 } 1475 } 1476 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1477 refcount_release(&blk->tfb_refcnt); 1478 INP_WUNLOCK(inp); 1479 return (ENOENT); 1480 } 1481 /* 1482 * Release the old refcnt, the 1483 * lookup acquired a ref on the 1484 * new one already. 1485 */ 1486 if (tp->t_fb->tfb_tcp_fb_fini) { 1487 /* 1488 * Tell the stack to cleanup with 0 i.e. 1489 * the tcb is not going away. 1490 */ 1491 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1492 } 1493 refcount_release(&tp->t_fb->tfb_refcnt); 1494 tp->t_fb = blk; 1495 if (tp->t_fb->tfb_tcp_fb_init) { 1496 (*tp->t_fb->tfb_tcp_fb_init)(tp); 1497 } 1498 #ifdef TCP_OFFLOAD 1499 if (tp->t_flags & TF_TOE) { 1500 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1501 sopt->sopt_name); 1502 } 1503 #endif 1504 INP_WUNLOCK(inp); 1505 return (error); 1506 } else if ((sopt->sopt_dir == SOPT_GET) && 1507 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1508 strcpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name); 1509 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1510 INP_WUNLOCK(inp); 1511 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1512 return (error); 1513 } 1514 /* Pass in the INP locked, called must unlock it */ 1515 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1516 } 1517 1518 int 1519 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1520 { 1521 int error, opt, optval; 1522 u_int ui; 1523 struct tcp_info ti; 1524 struct cc_algo *algo; 1525 char *pbuf, buf[TCP_CA_NAME_MAX]; 1526 size_t len; 1527 1528 /* 1529 * For TCP_CCALGOOPT forward the control to CC module, for both 1530 * SOPT_SET and SOPT_GET. 1531 */ 1532 switch (sopt->sopt_name) { 1533 case TCP_CCALGOOPT: 1534 INP_WUNLOCK(inp); 1535 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1536 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1537 sopt->sopt_valsize); 1538 if (error) { 1539 free(pbuf, M_TEMP); 1540 return (error); 1541 } 1542 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1543 if (CC_ALGO(tp)->ctl_output != NULL) 1544 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1545 else 1546 error = ENOENT; 1547 INP_WUNLOCK(inp); 1548 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1549 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1550 free(pbuf, M_TEMP); 1551 return (error); 1552 } 1553 1554 switch (sopt->sopt_dir) { 1555 case SOPT_SET: 1556 switch (sopt->sopt_name) { 1557 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1558 case TCP_MD5SIG: 1559 if (!TCPMD5_ENABLED()) { 1560 INP_WUNLOCK(inp); 1561 return (ENOPROTOOPT); 1562 } 1563 error = TCPMD5_PCBCTL(inp, sopt); 1564 if (error) 1565 return (error); 1566 goto unlock_and_done; 1567 #endif /* IPSEC */ 1568 1569 case TCP_NODELAY: 1570 case TCP_NOOPT: 1571 INP_WUNLOCK(inp); 1572 error = sooptcopyin(sopt, &optval, sizeof optval, 1573 sizeof optval); 1574 if (error) 1575 return (error); 1576 1577 INP_WLOCK_RECHECK(inp); 1578 switch (sopt->sopt_name) { 1579 case TCP_NODELAY: 1580 opt = TF_NODELAY; 1581 break; 1582 case TCP_NOOPT: 1583 opt = TF_NOOPT; 1584 break; 1585 default: 1586 opt = 0; /* dead code to fool gcc */ 1587 break; 1588 } 1589 1590 if (optval) 1591 tp->t_flags |= opt; 1592 else 1593 tp->t_flags &= ~opt; 1594 unlock_and_done: 1595 #ifdef TCP_OFFLOAD 1596 if (tp->t_flags & TF_TOE) { 1597 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1598 sopt->sopt_name); 1599 } 1600 #endif 1601 INP_WUNLOCK(inp); 1602 break; 1603 1604 case TCP_NOPUSH: 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) 1613 tp->t_flags |= TF_NOPUSH; 1614 else if (tp->t_flags & TF_NOPUSH) { 1615 tp->t_flags &= ~TF_NOPUSH; 1616 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1617 error = tp->t_fb->tfb_tcp_output(tp); 1618 } 1619 goto unlock_and_done; 1620 1621 case TCP_MAXSEG: 1622 INP_WUNLOCK(inp); 1623 error = sooptcopyin(sopt, &optval, sizeof optval, 1624 sizeof optval); 1625 if (error) 1626 return (error); 1627 1628 INP_WLOCK_RECHECK(inp); 1629 if (optval > 0 && optval <= tp->t_maxseg && 1630 optval + 40 >= V_tcp_minmss) 1631 tp->t_maxseg = optval; 1632 else 1633 error = EINVAL; 1634 goto unlock_and_done; 1635 1636 case TCP_INFO: 1637 INP_WUNLOCK(inp); 1638 error = EINVAL; 1639 break; 1640 1641 case TCP_CONGESTION: 1642 INP_WUNLOCK(inp); 1643 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1644 if (error) 1645 break; 1646 buf[sopt->sopt_valsize] = '\0'; 1647 INP_WLOCK_RECHECK(inp); 1648 CC_LIST_RLOCK(); 1649 STAILQ_FOREACH(algo, &cc_list, entries) 1650 if (strncmp(buf, algo->name, 1651 TCP_CA_NAME_MAX) == 0) 1652 break; 1653 CC_LIST_RUNLOCK(); 1654 if (algo == NULL) { 1655 INP_WUNLOCK(inp); 1656 error = EINVAL; 1657 break; 1658 } 1659 /* 1660 * We hold a write lock over the tcb so it's safe to 1661 * do these things without ordering concerns. 1662 */ 1663 if (CC_ALGO(tp)->cb_destroy != NULL) 1664 CC_ALGO(tp)->cb_destroy(tp->ccv); 1665 CC_ALGO(tp) = algo; 1666 /* 1667 * If something goes pear shaped initialising the new 1668 * algo, fall back to newreno (which does not 1669 * require initialisation). 1670 */ 1671 if (algo->cb_init != NULL && 1672 algo->cb_init(tp->ccv) != 0) { 1673 CC_ALGO(tp) = &newreno_cc_algo; 1674 /* 1675 * The only reason init should fail is 1676 * because of malloc. 1677 */ 1678 error = ENOMEM; 1679 } 1680 INP_WUNLOCK(inp); 1681 break; 1682 1683 case TCP_KEEPIDLE: 1684 case TCP_KEEPINTVL: 1685 case TCP_KEEPINIT: 1686 INP_WUNLOCK(inp); 1687 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1688 if (error) 1689 return (error); 1690 1691 if (ui > (UINT_MAX / hz)) { 1692 error = EINVAL; 1693 break; 1694 } 1695 ui *= hz; 1696 1697 INP_WLOCK_RECHECK(inp); 1698 switch (sopt->sopt_name) { 1699 case TCP_KEEPIDLE: 1700 tp->t_keepidle = ui; 1701 /* 1702 * XXX: better check current remaining 1703 * timeout and "merge" it with new value. 1704 */ 1705 if ((tp->t_state > TCPS_LISTEN) && 1706 (tp->t_state <= TCPS_CLOSING)) 1707 tcp_timer_activate(tp, TT_KEEP, 1708 TP_KEEPIDLE(tp)); 1709 break; 1710 case TCP_KEEPINTVL: 1711 tp->t_keepintvl = ui; 1712 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1713 (TP_MAXIDLE(tp) > 0)) 1714 tcp_timer_activate(tp, TT_2MSL, 1715 TP_MAXIDLE(tp)); 1716 break; 1717 case TCP_KEEPINIT: 1718 tp->t_keepinit = ui; 1719 if (tp->t_state == TCPS_SYN_RECEIVED || 1720 tp->t_state == TCPS_SYN_SENT) 1721 tcp_timer_activate(tp, TT_KEEP, 1722 TP_KEEPINIT(tp)); 1723 break; 1724 } 1725 goto unlock_and_done; 1726 1727 case TCP_KEEPCNT: 1728 INP_WUNLOCK(inp); 1729 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1730 if (error) 1731 return (error); 1732 1733 INP_WLOCK_RECHECK(inp); 1734 tp->t_keepcnt = ui; 1735 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1736 (TP_MAXIDLE(tp) > 0)) 1737 tcp_timer_activate(tp, TT_2MSL, 1738 TP_MAXIDLE(tp)); 1739 goto unlock_and_done; 1740 1741 #ifdef TCPPCAP 1742 case TCP_PCAP_OUT: 1743 case TCP_PCAP_IN: 1744 INP_WUNLOCK(inp); 1745 error = sooptcopyin(sopt, &optval, sizeof optval, 1746 sizeof optval); 1747 if (error) 1748 return (error); 1749 1750 INP_WLOCK_RECHECK(inp); 1751 if (optval >= 0) 1752 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1753 &(tp->t_outpkts) : &(tp->t_inpkts), 1754 optval); 1755 else 1756 error = EINVAL; 1757 goto unlock_and_done; 1758 #endif 1759 1760 #ifdef TCP_RFC7413 1761 case TCP_FASTOPEN: 1762 INP_WUNLOCK(inp); 1763 if (!V_tcp_fastopen_enabled) 1764 return (EPERM); 1765 1766 error = sooptcopyin(sopt, &optval, sizeof optval, 1767 sizeof optval); 1768 if (error) 1769 return (error); 1770 1771 INP_WLOCK_RECHECK(inp); 1772 if (optval) { 1773 tp->t_flags |= TF_FASTOPEN; 1774 if ((tp->t_state == TCPS_LISTEN) && 1775 (tp->t_tfo_pending == NULL)) 1776 tp->t_tfo_pending = 1777 tcp_fastopen_alloc_counter(); 1778 } else 1779 tp->t_flags &= ~TF_FASTOPEN; 1780 goto unlock_and_done; 1781 #endif 1782 1783 default: 1784 INP_WUNLOCK(inp); 1785 error = ENOPROTOOPT; 1786 break; 1787 } 1788 break; 1789 1790 case SOPT_GET: 1791 tp = intotcpcb(inp); 1792 switch (sopt->sopt_name) { 1793 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1794 case TCP_MD5SIG: 1795 if (!TCPMD5_ENABLED()) { 1796 INP_WUNLOCK(inp); 1797 return (ENOPROTOOPT); 1798 } 1799 error = TCPMD5_PCBCTL(inp, sopt); 1800 break; 1801 #endif 1802 1803 case TCP_NODELAY: 1804 optval = tp->t_flags & TF_NODELAY; 1805 INP_WUNLOCK(inp); 1806 error = sooptcopyout(sopt, &optval, sizeof optval); 1807 break; 1808 case TCP_MAXSEG: 1809 optval = tp->t_maxseg; 1810 INP_WUNLOCK(inp); 1811 error = sooptcopyout(sopt, &optval, sizeof optval); 1812 break; 1813 case TCP_NOOPT: 1814 optval = tp->t_flags & TF_NOOPT; 1815 INP_WUNLOCK(inp); 1816 error = sooptcopyout(sopt, &optval, sizeof optval); 1817 break; 1818 case TCP_NOPUSH: 1819 optval = tp->t_flags & TF_NOPUSH; 1820 INP_WUNLOCK(inp); 1821 error = sooptcopyout(sopt, &optval, sizeof optval); 1822 break; 1823 case TCP_INFO: 1824 tcp_fill_info(tp, &ti); 1825 INP_WUNLOCK(inp); 1826 error = sooptcopyout(sopt, &ti, sizeof ti); 1827 break; 1828 case TCP_CONGESTION: 1829 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1830 INP_WUNLOCK(inp); 1831 error = sooptcopyout(sopt, buf, len + 1); 1832 break; 1833 case TCP_KEEPIDLE: 1834 case TCP_KEEPINTVL: 1835 case TCP_KEEPINIT: 1836 case TCP_KEEPCNT: 1837 switch (sopt->sopt_name) { 1838 case TCP_KEEPIDLE: 1839 ui = TP_KEEPIDLE(tp) / hz; 1840 break; 1841 case TCP_KEEPINTVL: 1842 ui = TP_KEEPINTVL(tp) / hz; 1843 break; 1844 case TCP_KEEPINIT: 1845 ui = TP_KEEPINIT(tp) / hz; 1846 break; 1847 case TCP_KEEPCNT: 1848 ui = TP_KEEPCNT(tp); 1849 break; 1850 } 1851 INP_WUNLOCK(inp); 1852 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1853 break; 1854 #ifdef TCPPCAP 1855 case TCP_PCAP_OUT: 1856 case TCP_PCAP_IN: 1857 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1858 &(tp->t_outpkts) : &(tp->t_inpkts)); 1859 INP_WUNLOCK(inp); 1860 error = sooptcopyout(sopt, &optval, sizeof optval); 1861 break; 1862 #endif 1863 1864 #ifdef TCP_RFC7413 1865 case TCP_FASTOPEN: 1866 optval = tp->t_flags & TF_FASTOPEN; 1867 INP_WUNLOCK(inp); 1868 error = sooptcopyout(sopt, &optval, sizeof optval); 1869 break; 1870 #endif 1871 default: 1872 INP_WUNLOCK(inp); 1873 error = ENOPROTOOPT; 1874 break; 1875 } 1876 break; 1877 } 1878 return (error); 1879 } 1880 #undef INP_WLOCK_RECHECK 1881 #undef INP_WLOCK_RECHECK_CLEANUP 1882 1883 /* 1884 * Attach TCP protocol to socket, allocating 1885 * internet protocol control block, tcp control block, 1886 * bufer space, and entering LISTEN state if to accept connections. 1887 */ 1888 static int 1889 tcp_attach(struct socket *so) 1890 { 1891 struct tcpcb *tp; 1892 struct inpcb *inp; 1893 int error; 1894 1895 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1896 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1897 if (error) 1898 return (error); 1899 } 1900 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1901 so->so_snd.sb_flags |= SB_AUTOSIZE; 1902 INP_INFO_RLOCK(&V_tcbinfo); 1903 error = in_pcballoc(so, &V_tcbinfo); 1904 if (error) { 1905 INP_INFO_RUNLOCK(&V_tcbinfo); 1906 return (error); 1907 } 1908 inp = sotoinpcb(so); 1909 #ifdef INET6 1910 if (inp->inp_vflag & INP_IPV6PROTO) { 1911 inp->inp_vflag |= INP_IPV6; 1912 inp->in6p_hops = -1; /* use kernel default */ 1913 } 1914 else 1915 #endif 1916 inp->inp_vflag |= INP_IPV4; 1917 tp = tcp_newtcpcb(inp); 1918 if (tp == NULL) { 1919 in_pcbdetach(inp); 1920 in_pcbfree(inp); 1921 INP_INFO_RUNLOCK(&V_tcbinfo); 1922 return (ENOBUFS); 1923 } 1924 tp->t_state = TCPS_CLOSED; 1925 INP_WUNLOCK(inp); 1926 INP_INFO_RUNLOCK(&V_tcbinfo); 1927 TCPSTATES_INC(TCPS_CLOSED); 1928 return (0); 1929 } 1930 1931 /* 1932 * Initiate (or continue) disconnect. 1933 * If embryonic state, just send reset (once). 1934 * If in ``let data drain'' option and linger null, just drop. 1935 * Otherwise (hard), mark socket disconnecting and drop 1936 * current input data; switch states based on user close, and 1937 * send segment to peer (with FIN). 1938 */ 1939 static void 1940 tcp_disconnect(struct tcpcb *tp) 1941 { 1942 struct inpcb *inp = tp->t_inpcb; 1943 struct socket *so = inp->inp_socket; 1944 1945 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1946 INP_WLOCK_ASSERT(inp); 1947 1948 /* 1949 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1950 * socket is still open. 1951 */ 1952 if (tp->t_state < TCPS_ESTABLISHED) { 1953 tp = tcp_close(tp); 1954 KASSERT(tp != NULL, 1955 ("tcp_disconnect: tcp_close() returned NULL")); 1956 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1957 tp = tcp_drop(tp, 0); 1958 KASSERT(tp != NULL, 1959 ("tcp_disconnect: tcp_drop() returned NULL")); 1960 } else { 1961 soisdisconnecting(so); 1962 sbflush(&so->so_rcv); 1963 tcp_usrclosed(tp); 1964 if (!(inp->inp_flags & INP_DROPPED)) 1965 tp->t_fb->tfb_tcp_output(tp); 1966 } 1967 } 1968 1969 /* 1970 * User issued close, and wish to trail through shutdown states: 1971 * if never received SYN, just forget it. If got a SYN from peer, 1972 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1973 * If already got a FIN from peer, then almost done; go to LAST_ACK 1974 * state. In all other cases, have already sent FIN to peer (e.g. 1975 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1976 * for peer to send FIN or not respond to keep-alives, etc. 1977 * We can let the user exit from the close as soon as the FIN is acked. 1978 */ 1979 static void 1980 tcp_usrclosed(struct tcpcb *tp) 1981 { 1982 1983 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1984 INP_WLOCK_ASSERT(tp->t_inpcb); 1985 1986 switch (tp->t_state) { 1987 case TCPS_LISTEN: 1988 #ifdef TCP_OFFLOAD 1989 tcp_offload_listen_stop(tp); 1990 #endif 1991 tcp_state_change(tp, TCPS_CLOSED); 1992 /* FALLTHROUGH */ 1993 case TCPS_CLOSED: 1994 tp = tcp_close(tp); 1995 /* 1996 * tcp_close() should never return NULL here as the socket is 1997 * still open. 1998 */ 1999 KASSERT(tp != NULL, 2000 ("tcp_usrclosed: tcp_close() returned NULL")); 2001 break; 2002 2003 case TCPS_SYN_SENT: 2004 case TCPS_SYN_RECEIVED: 2005 tp->t_flags |= TF_NEEDFIN; 2006 break; 2007 2008 case TCPS_ESTABLISHED: 2009 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2010 break; 2011 2012 case TCPS_CLOSE_WAIT: 2013 tcp_state_change(tp, TCPS_LAST_ACK); 2014 break; 2015 } 2016 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2017 soisdisconnected(tp->t_inpcb->inp_socket); 2018 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2019 if (tp->t_state == TCPS_FIN_WAIT_2) { 2020 int timeout; 2021 2022 timeout = (tcp_fast_finwait2_recycle) ? 2023 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2024 tcp_timer_activate(tp, TT_2MSL, timeout); 2025 } 2026 } 2027 } 2028 2029 #ifdef DDB 2030 static void 2031 db_print_indent(int indent) 2032 { 2033 int i; 2034 2035 for (i = 0; i < indent; i++) 2036 db_printf(" "); 2037 } 2038 2039 static void 2040 db_print_tstate(int t_state) 2041 { 2042 2043 switch (t_state) { 2044 case TCPS_CLOSED: 2045 db_printf("TCPS_CLOSED"); 2046 return; 2047 2048 case TCPS_LISTEN: 2049 db_printf("TCPS_LISTEN"); 2050 return; 2051 2052 case TCPS_SYN_SENT: 2053 db_printf("TCPS_SYN_SENT"); 2054 return; 2055 2056 case TCPS_SYN_RECEIVED: 2057 db_printf("TCPS_SYN_RECEIVED"); 2058 return; 2059 2060 case TCPS_ESTABLISHED: 2061 db_printf("TCPS_ESTABLISHED"); 2062 return; 2063 2064 case TCPS_CLOSE_WAIT: 2065 db_printf("TCPS_CLOSE_WAIT"); 2066 return; 2067 2068 case TCPS_FIN_WAIT_1: 2069 db_printf("TCPS_FIN_WAIT_1"); 2070 return; 2071 2072 case TCPS_CLOSING: 2073 db_printf("TCPS_CLOSING"); 2074 return; 2075 2076 case TCPS_LAST_ACK: 2077 db_printf("TCPS_LAST_ACK"); 2078 return; 2079 2080 case TCPS_FIN_WAIT_2: 2081 db_printf("TCPS_FIN_WAIT_2"); 2082 return; 2083 2084 case TCPS_TIME_WAIT: 2085 db_printf("TCPS_TIME_WAIT"); 2086 return; 2087 2088 default: 2089 db_printf("unknown"); 2090 return; 2091 } 2092 } 2093 2094 static void 2095 db_print_tflags(u_int t_flags) 2096 { 2097 int comma; 2098 2099 comma = 0; 2100 if (t_flags & TF_ACKNOW) { 2101 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2102 comma = 1; 2103 } 2104 if (t_flags & TF_DELACK) { 2105 db_printf("%sTF_DELACK", comma ? ", " : ""); 2106 comma = 1; 2107 } 2108 if (t_flags & TF_NODELAY) { 2109 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2110 comma = 1; 2111 } 2112 if (t_flags & TF_NOOPT) { 2113 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2114 comma = 1; 2115 } 2116 if (t_flags & TF_SENTFIN) { 2117 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2118 comma = 1; 2119 } 2120 if (t_flags & TF_REQ_SCALE) { 2121 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2122 comma = 1; 2123 } 2124 if (t_flags & TF_RCVD_SCALE) { 2125 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2126 comma = 1; 2127 } 2128 if (t_flags & TF_REQ_TSTMP) { 2129 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2130 comma = 1; 2131 } 2132 if (t_flags & TF_RCVD_TSTMP) { 2133 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2134 comma = 1; 2135 } 2136 if (t_flags & TF_SACK_PERMIT) { 2137 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2138 comma = 1; 2139 } 2140 if (t_flags & TF_NEEDSYN) { 2141 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2142 comma = 1; 2143 } 2144 if (t_flags & TF_NEEDFIN) { 2145 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2146 comma = 1; 2147 } 2148 if (t_flags & TF_NOPUSH) { 2149 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2150 comma = 1; 2151 } 2152 if (t_flags & TF_MORETOCOME) { 2153 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2154 comma = 1; 2155 } 2156 if (t_flags & TF_LQ_OVERFLOW) { 2157 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2158 comma = 1; 2159 } 2160 if (t_flags & TF_LASTIDLE) { 2161 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2162 comma = 1; 2163 } 2164 if (t_flags & TF_RXWIN0SENT) { 2165 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2166 comma = 1; 2167 } 2168 if (t_flags & TF_FASTRECOVERY) { 2169 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2170 comma = 1; 2171 } 2172 if (t_flags & TF_CONGRECOVERY) { 2173 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2174 comma = 1; 2175 } 2176 if (t_flags & TF_WASFRECOVERY) { 2177 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2178 comma = 1; 2179 } 2180 if (t_flags & TF_SIGNATURE) { 2181 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2182 comma = 1; 2183 } 2184 if (t_flags & TF_FORCEDATA) { 2185 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2186 comma = 1; 2187 } 2188 if (t_flags & TF_TSO) { 2189 db_printf("%sTF_TSO", comma ? ", " : ""); 2190 comma = 1; 2191 } 2192 if (t_flags & TF_ECN_PERMIT) { 2193 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2194 comma = 1; 2195 } 2196 if (t_flags & TF_FASTOPEN) { 2197 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2198 comma = 1; 2199 } 2200 } 2201 2202 static void 2203 db_print_toobflags(char t_oobflags) 2204 { 2205 int comma; 2206 2207 comma = 0; 2208 if (t_oobflags & TCPOOB_HAVEDATA) { 2209 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2210 comma = 1; 2211 } 2212 if (t_oobflags & TCPOOB_HADDATA) { 2213 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2214 comma = 1; 2215 } 2216 } 2217 2218 static void 2219 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2220 { 2221 2222 db_print_indent(indent); 2223 db_printf("%s at %p\n", name, tp); 2224 2225 indent += 2; 2226 2227 db_print_indent(indent); 2228 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2229 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2230 2231 db_print_indent(indent); 2232 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2233 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2234 2235 db_print_indent(indent); 2236 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2237 &tp->t_timers->tt_delack, tp->t_inpcb); 2238 2239 db_print_indent(indent); 2240 db_printf("t_state: %d (", tp->t_state); 2241 db_print_tstate(tp->t_state); 2242 db_printf(")\n"); 2243 2244 db_print_indent(indent); 2245 db_printf("t_flags: 0x%x (", tp->t_flags); 2246 db_print_tflags(tp->t_flags); 2247 db_printf(")\n"); 2248 2249 db_print_indent(indent); 2250 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2251 tp->snd_una, tp->snd_max, tp->snd_nxt); 2252 2253 db_print_indent(indent); 2254 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2255 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2256 2257 db_print_indent(indent); 2258 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2259 tp->iss, tp->irs, tp->rcv_nxt); 2260 2261 db_print_indent(indent); 2262 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2263 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2264 2265 db_print_indent(indent); 2266 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2267 tp->snd_wnd, tp->snd_cwnd); 2268 2269 db_print_indent(indent); 2270 db_printf("snd_ssthresh: %u snd_recover: " 2271 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2272 2273 db_print_indent(indent); 2274 db_printf("t_rcvtime: %u t_startime: %u\n", 2275 tp->t_rcvtime, tp->t_starttime); 2276 2277 db_print_indent(indent); 2278 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2279 tp->t_rtttime, tp->t_rtseq); 2280 2281 db_print_indent(indent); 2282 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2283 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2284 2285 db_print_indent(indent); 2286 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2287 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2288 tp->t_rttbest); 2289 2290 db_print_indent(indent); 2291 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2292 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2293 2294 db_print_indent(indent); 2295 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2296 db_print_toobflags(tp->t_oobflags); 2297 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2298 2299 db_print_indent(indent); 2300 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2301 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2302 2303 db_print_indent(indent); 2304 db_printf("ts_recent: %u ts_recent_age: %u\n", 2305 tp->ts_recent, tp->ts_recent_age); 2306 2307 db_print_indent(indent); 2308 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2309 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2310 2311 db_print_indent(indent); 2312 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2313 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2314 tp->snd_recover_prev, tp->t_badrxtwin); 2315 2316 db_print_indent(indent); 2317 db_printf("snd_numholes: %d snd_holes first: %p\n", 2318 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2319 2320 db_print_indent(indent); 2321 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2322 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2323 2324 /* Skip sackblks, sackhint. */ 2325 2326 db_print_indent(indent); 2327 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2328 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2329 } 2330 2331 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2332 { 2333 struct tcpcb *tp; 2334 2335 if (!have_addr) { 2336 db_printf("usage: show tcpcb <addr>\n"); 2337 return; 2338 } 2339 tp = (struct tcpcb *)addr; 2340 2341 db_print_tcpcb(tp, "tcpcb", 0); 2342 } 2343 #endif 2344