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/tcp_log_buf.h> 94 #include <netinet/tcpip.h> 95 #include <netinet/cc/cc.h> 96 #include <netinet/tcp_fastopen.h> 97 #include <netinet/tcp_hpts.h> 98 #ifdef TCPPCAP 99 #include <netinet/tcp_pcap.h> 100 #endif 101 #ifdef TCPDEBUG 102 #include <netinet/tcp_debug.h> 103 #endif 104 #ifdef TCP_OFFLOAD 105 #include <netinet/tcp_offload.h> 106 #endif 107 #include <netipsec/ipsec_support.h> 108 109 /* 110 * TCP protocol interface to socket abstraction. 111 */ 112 static int tcp_attach(struct socket *); 113 #ifdef INET 114 static int tcp_connect(struct tcpcb *, struct sockaddr *, 115 struct thread *td); 116 #endif /* INET */ 117 #ifdef INET6 118 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 119 struct thread *td); 120 #endif /* INET6 */ 121 static void tcp_disconnect(struct tcpcb *); 122 static void tcp_usrclosed(struct tcpcb *); 123 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 124 125 #ifdef TCPDEBUG 126 #define TCPDEBUG0 int ostate = 0 127 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 128 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 129 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 130 #else 131 #define TCPDEBUG0 132 #define TCPDEBUG1() 133 #define TCPDEBUG2(req) 134 #endif 135 136 /* 137 * TCP attaches to socket via pru_attach(), reserving space, 138 * and an internet control block. 139 */ 140 static int 141 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 142 { 143 struct inpcb *inp; 144 struct tcpcb *tp = NULL; 145 int error; 146 TCPDEBUG0; 147 148 inp = sotoinpcb(so); 149 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 150 TCPDEBUG1(); 151 152 error = tcp_attach(so); 153 if (error) 154 goto out; 155 156 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 157 so->so_linger = TCP_LINGERTIME; 158 159 inp = sotoinpcb(so); 160 tp = intotcpcb(inp); 161 out: 162 TCPDEBUG2(PRU_ATTACH); 163 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 164 return error; 165 } 166 167 /* 168 * tcp_detach is called when the socket layer loses its final reference 169 * to the socket, be it a file descriptor reference, a reference from TCP, 170 * etc. At this point, there is only one case in which we will keep around 171 * inpcb state: time wait. 172 * 173 * This function can probably be re-absorbed back into tcp_usr_detach() now 174 * that there is a single detach path. 175 */ 176 static void 177 tcp_detach(struct socket *so, struct inpcb *inp) 178 { 179 struct tcpcb *tp; 180 181 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 182 INP_WLOCK_ASSERT(inp); 183 184 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 185 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 186 187 tp = intotcpcb(inp); 188 189 if (inp->inp_flags & INP_TIMEWAIT) { 190 /* 191 * There are two cases to handle: one in which the time wait 192 * state is being discarded (INP_DROPPED), and one in which 193 * this connection will remain in timewait. In the former, 194 * it is time to discard all state (except tcptw, which has 195 * already been discarded by the timewait close code, which 196 * should be further up the call stack somewhere). In the 197 * latter case, we detach from the socket, but leave the pcb 198 * present until timewait ends. 199 * 200 * XXXRW: Would it be cleaner to free the tcptw here? 201 * 202 * Astute question indeed, from twtcp perspective there are 203 * four cases to consider: 204 * 205 * #1 tcp_detach is called at tcptw creation time by 206 * tcp_twstart, then do not discard the newly created tcptw 207 * and leave inpcb present until timewait ends 208 * #2 tcp_detach is called at tcptw creation time by 209 * tcp_twstart, but connection is local and tw will be 210 * discarded immediately 211 * #3 tcp_detach is called at timewait end (or reuse) by 212 * tcp_twclose, then the tcptw has already been discarded 213 * (or reused) and inpcb is freed here 214 * #4 tcp_detach is called() after timewait ends (or reuse) 215 * (e.g. by soclose), then tcptw has already been discarded 216 * (or reused) and inpcb is freed here 217 * 218 * In all three cases the tcptw should not be freed here. 219 */ 220 if (inp->inp_flags & INP_DROPPED) { 221 in_pcbdetach(inp); 222 if (__predict_true(tp == NULL)) { 223 in_pcbfree(inp); 224 } else { 225 /* 226 * This case should not happen as in TIMEWAIT 227 * state the inp should not be destroyed before 228 * its tcptw. If INVARIANTS is defined, panic. 229 */ 230 #ifdef INVARIANTS 231 panic("%s: Panic before an inp double-free: " 232 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 233 , __func__); 234 #else 235 log(LOG_ERR, "%s: Avoid an inp double-free: " 236 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 237 , __func__); 238 #endif 239 INP_WUNLOCK(inp); 240 } 241 } else { 242 in_pcbdetach(inp); 243 INP_WUNLOCK(inp); 244 } 245 } else { 246 /* 247 * If the connection is not in timewait, we consider two 248 * two conditions: one in which no further processing is 249 * necessary (dropped || embryonic), and one in which TCP is 250 * not yet done, but no longer requires the socket, so the 251 * pcb will persist for the time being. 252 * 253 * XXXRW: Does the second case still occur? 254 */ 255 if (inp->inp_flags & INP_DROPPED || 256 tp->t_state < TCPS_SYN_SENT) { 257 tcp_discardcb(tp); 258 in_pcbdetach(inp); 259 in_pcbfree(inp); 260 } else { 261 in_pcbdetach(inp); 262 INP_WUNLOCK(inp); 263 } 264 } 265 } 266 267 /* 268 * pru_detach() detaches the TCP protocol from the socket. 269 * If the protocol state is non-embryonic, then can't 270 * do this directly: have to initiate a pru_disconnect(), 271 * which may finish later; embryonic TCB's can just 272 * be discarded here. 273 */ 274 static void 275 tcp_usr_detach(struct socket *so) 276 { 277 struct inpcb *inp; 278 int rlock = 0; 279 280 inp = sotoinpcb(so); 281 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 282 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 283 INP_INFO_RLOCK(&V_tcbinfo); 284 rlock = 1; 285 } 286 INP_WLOCK(inp); 287 KASSERT(inp->inp_socket != NULL, 288 ("tcp_usr_detach: inp_socket == NULL")); 289 tcp_detach(so, inp); 290 if (rlock) 291 INP_INFO_RUNLOCK(&V_tcbinfo); 292 } 293 294 #ifdef INET 295 /* 296 * Give the socket an address. 297 */ 298 static int 299 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 300 { 301 int error = 0; 302 struct inpcb *inp; 303 struct tcpcb *tp = NULL; 304 struct sockaddr_in *sinp; 305 306 sinp = (struct sockaddr_in *)nam; 307 if (nam->sa_len != sizeof (*sinp)) 308 return (EINVAL); 309 /* 310 * Must check for multicast addresses and disallow binding 311 * to them. 312 */ 313 if (sinp->sin_family == AF_INET && 314 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 315 return (EAFNOSUPPORT); 316 317 TCPDEBUG0; 318 inp = sotoinpcb(so); 319 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 320 INP_WLOCK(inp); 321 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 322 error = EINVAL; 323 goto out; 324 } 325 tp = intotcpcb(inp); 326 TCPDEBUG1(); 327 INP_HASH_WLOCK(&V_tcbinfo); 328 error = in_pcbbind(inp, nam, td->td_ucred); 329 INP_HASH_WUNLOCK(&V_tcbinfo); 330 out: 331 TCPDEBUG2(PRU_BIND); 332 TCP_PROBE2(debug__user, tp, PRU_BIND); 333 INP_WUNLOCK(inp); 334 335 return (error); 336 } 337 #endif /* INET */ 338 339 #ifdef INET6 340 static int 341 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 342 { 343 int error = 0; 344 struct inpcb *inp; 345 struct tcpcb *tp = NULL; 346 struct sockaddr_in6 *sin6p; 347 348 sin6p = (struct sockaddr_in6 *)nam; 349 if (nam->sa_len != sizeof (*sin6p)) 350 return (EINVAL); 351 /* 352 * Must check for multicast addresses and disallow binding 353 * to them. 354 */ 355 if (sin6p->sin6_family == AF_INET6 && 356 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 357 return (EAFNOSUPPORT); 358 359 TCPDEBUG0; 360 inp = sotoinpcb(so); 361 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 362 INP_WLOCK(inp); 363 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 364 error = EINVAL; 365 goto out; 366 } 367 tp = intotcpcb(inp); 368 TCPDEBUG1(); 369 INP_HASH_WLOCK(&V_tcbinfo); 370 inp->inp_vflag &= ~INP_IPV4; 371 inp->inp_vflag |= INP_IPV6; 372 #ifdef INET 373 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 374 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 375 inp->inp_vflag |= INP_IPV4; 376 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 377 struct sockaddr_in sin; 378 379 in6_sin6_2_sin(&sin, sin6p); 380 inp->inp_vflag |= INP_IPV4; 381 inp->inp_vflag &= ~INP_IPV6; 382 error = in_pcbbind(inp, (struct sockaddr *)&sin, 383 td->td_ucred); 384 INP_HASH_WUNLOCK(&V_tcbinfo); 385 goto out; 386 } 387 } 388 #endif 389 error = in6_pcbbind(inp, nam, td->td_ucred); 390 INP_HASH_WUNLOCK(&V_tcbinfo); 391 out: 392 TCPDEBUG2(PRU_BIND); 393 TCP_PROBE2(debug__user, tp, PRU_BIND); 394 INP_WUNLOCK(inp); 395 return (error); 396 } 397 #endif /* INET6 */ 398 399 #ifdef INET 400 /* 401 * Prepare to accept connections. 402 */ 403 static int 404 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 405 { 406 int error = 0; 407 struct inpcb *inp; 408 struct tcpcb *tp = NULL; 409 410 TCPDEBUG0; 411 inp = sotoinpcb(so); 412 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 413 INP_WLOCK(inp); 414 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 415 error = EINVAL; 416 goto out; 417 } 418 tp = intotcpcb(inp); 419 TCPDEBUG1(); 420 SOCK_LOCK(so); 421 error = solisten_proto_check(so); 422 INP_HASH_WLOCK(&V_tcbinfo); 423 if (error == 0 && inp->inp_lport == 0) 424 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 425 INP_HASH_WUNLOCK(&V_tcbinfo); 426 if (error == 0) { 427 tcp_state_change(tp, TCPS_LISTEN); 428 solisten_proto(so, backlog); 429 #ifdef TCP_OFFLOAD 430 if ((so->so_options & SO_NO_OFFLOAD) == 0) 431 tcp_offload_listen_start(tp); 432 #endif 433 } 434 SOCK_UNLOCK(so); 435 436 if (IS_FASTOPEN(tp->t_flags)) 437 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 438 439 out: 440 TCPDEBUG2(PRU_LISTEN); 441 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 442 INP_WUNLOCK(inp); 443 return (error); 444 } 445 #endif /* INET */ 446 447 #ifdef INET6 448 static int 449 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 450 { 451 int error = 0; 452 struct inpcb *inp; 453 struct tcpcb *tp = NULL; 454 455 TCPDEBUG0; 456 inp = sotoinpcb(so); 457 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 458 INP_WLOCK(inp); 459 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 460 error = EINVAL; 461 goto out; 462 } 463 tp = intotcpcb(inp); 464 TCPDEBUG1(); 465 SOCK_LOCK(so); 466 error = solisten_proto_check(so); 467 INP_HASH_WLOCK(&V_tcbinfo); 468 if (error == 0 && inp->inp_lport == 0) { 469 inp->inp_vflag &= ~INP_IPV4; 470 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 471 inp->inp_vflag |= INP_IPV4; 472 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 473 } 474 INP_HASH_WUNLOCK(&V_tcbinfo); 475 if (error == 0) { 476 tcp_state_change(tp, TCPS_LISTEN); 477 solisten_proto(so, backlog); 478 #ifdef TCP_OFFLOAD 479 if ((so->so_options & SO_NO_OFFLOAD) == 0) 480 tcp_offload_listen_start(tp); 481 #endif 482 } 483 SOCK_UNLOCK(so); 484 485 if (IS_FASTOPEN(tp->t_flags)) 486 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 487 488 out: 489 TCPDEBUG2(PRU_LISTEN); 490 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 491 INP_WUNLOCK(inp); 492 return (error); 493 } 494 #endif /* INET6 */ 495 496 #ifdef INET 497 /* 498 * Initiate connection to peer. 499 * Create a template for use in transmissions on this connection. 500 * Enter SYN_SENT state, and mark socket as connecting. 501 * Start keep-alive timer, and seed output sequence space. 502 * Send initial segment on connection. 503 */ 504 static int 505 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 506 { 507 int error = 0; 508 struct inpcb *inp; 509 struct tcpcb *tp = NULL; 510 struct sockaddr_in *sinp; 511 512 sinp = (struct sockaddr_in *)nam; 513 if (nam->sa_len != sizeof (*sinp)) 514 return (EINVAL); 515 /* 516 * Must disallow TCP ``connections'' to multicast addresses. 517 */ 518 if (sinp->sin_family == AF_INET 519 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 520 return (EAFNOSUPPORT); 521 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 522 return (error); 523 524 TCPDEBUG0; 525 inp = sotoinpcb(so); 526 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 527 INP_WLOCK(inp); 528 if (inp->inp_flags & INP_TIMEWAIT) { 529 error = EADDRINUSE; 530 goto out; 531 } 532 if (inp->inp_flags & INP_DROPPED) { 533 error = ECONNREFUSED; 534 goto out; 535 } 536 tp = intotcpcb(inp); 537 TCPDEBUG1(); 538 if ((error = tcp_connect(tp, nam, td)) != 0) 539 goto out; 540 #ifdef TCP_OFFLOAD 541 if (registered_toedevs > 0 && 542 (so->so_options & SO_NO_OFFLOAD) == 0 && 543 (error = tcp_offload_connect(so, nam)) == 0) 544 goto out; 545 #endif 546 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 547 error = tp->t_fb->tfb_tcp_output(tp); 548 out: 549 TCPDEBUG2(PRU_CONNECT); 550 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 551 INP_WUNLOCK(inp); 552 return (error); 553 } 554 #endif /* INET */ 555 556 #ifdef INET6 557 static int 558 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 559 { 560 int error = 0; 561 struct inpcb *inp; 562 struct tcpcb *tp = NULL; 563 struct sockaddr_in6 *sin6p; 564 565 TCPDEBUG0; 566 567 sin6p = (struct sockaddr_in6 *)nam; 568 if (nam->sa_len != sizeof (*sin6p)) 569 return (EINVAL); 570 /* 571 * Must disallow TCP ``connections'' to multicast addresses. 572 */ 573 if (sin6p->sin6_family == AF_INET6 574 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 575 return (EAFNOSUPPORT); 576 577 inp = sotoinpcb(so); 578 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 579 INP_WLOCK(inp); 580 if (inp->inp_flags & INP_TIMEWAIT) { 581 error = EADDRINUSE; 582 goto out; 583 } 584 if (inp->inp_flags & INP_DROPPED) { 585 error = ECONNREFUSED; 586 goto out; 587 } 588 tp = intotcpcb(inp); 589 TCPDEBUG1(); 590 #ifdef INET 591 /* 592 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 593 * therefore probably require the hash lock, which isn't held here. 594 * Is this a significant problem? 595 */ 596 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 597 struct sockaddr_in sin; 598 599 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 600 error = EINVAL; 601 goto out; 602 } 603 if ((inp->inp_vflag & INP_IPV4) == 0) { 604 error = EAFNOSUPPORT; 605 goto out; 606 } 607 608 in6_sin6_2_sin(&sin, sin6p); 609 inp->inp_vflag |= INP_IPV4; 610 inp->inp_vflag &= ~INP_IPV6; 611 if ((error = prison_remote_ip4(td->td_ucred, 612 &sin.sin_addr)) != 0) 613 goto out; 614 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 615 goto out; 616 #ifdef TCP_OFFLOAD 617 if (registered_toedevs > 0 && 618 (so->so_options & SO_NO_OFFLOAD) == 0 && 619 (error = tcp_offload_connect(so, nam)) == 0) 620 goto out; 621 #endif 622 error = tp->t_fb->tfb_tcp_output(tp); 623 goto out; 624 } else { 625 if ((inp->inp_vflag & INP_IPV6) == 0) { 626 error = EAFNOSUPPORT; 627 goto out; 628 } 629 } 630 #endif 631 inp->inp_vflag &= ~INP_IPV4; 632 inp->inp_vflag |= INP_IPV6; 633 inp->inp_inc.inc_flags |= INC_ISIPV6; 634 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 635 goto out; 636 if ((error = tcp6_connect(tp, nam, td)) != 0) 637 goto out; 638 #ifdef TCP_OFFLOAD 639 if (registered_toedevs > 0 && 640 (so->so_options & SO_NO_OFFLOAD) == 0 && 641 (error = tcp_offload_connect(so, nam)) == 0) 642 goto out; 643 #endif 644 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 645 error = tp->t_fb->tfb_tcp_output(tp); 646 647 out: 648 TCPDEBUG2(PRU_CONNECT); 649 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 650 INP_WUNLOCK(inp); 651 return (error); 652 } 653 #endif /* INET6 */ 654 655 /* 656 * Initiate disconnect from peer. 657 * If connection never passed embryonic stage, just drop; 658 * else if don't need to let data drain, then can just drop anyways, 659 * else have to begin TCP shutdown process: mark socket disconnecting, 660 * drain unread data, state switch to reflect user close, and 661 * send segment (e.g. FIN) to peer. Socket will be really disconnected 662 * when peer sends FIN and acks ours. 663 * 664 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 665 */ 666 static int 667 tcp_usr_disconnect(struct socket *so) 668 { 669 struct inpcb *inp; 670 struct tcpcb *tp = NULL; 671 int error = 0; 672 673 TCPDEBUG0; 674 INP_INFO_RLOCK(&V_tcbinfo); 675 inp = sotoinpcb(so); 676 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 677 INP_WLOCK(inp); 678 if (inp->inp_flags & INP_TIMEWAIT) 679 goto out; 680 if (inp->inp_flags & INP_DROPPED) { 681 error = ECONNRESET; 682 goto out; 683 } 684 tp = intotcpcb(inp); 685 TCPDEBUG1(); 686 tcp_disconnect(tp); 687 out: 688 TCPDEBUG2(PRU_DISCONNECT); 689 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 690 INP_WUNLOCK(inp); 691 INP_INFO_RUNLOCK(&V_tcbinfo); 692 return (error); 693 } 694 695 #ifdef INET 696 /* 697 * Accept a connection. Essentially all the work is done at higher levels; 698 * just return the address of the peer, storing through addr. 699 */ 700 static int 701 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 702 { 703 int error = 0; 704 struct inpcb *inp = NULL; 705 struct tcpcb *tp = NULL; 706 struct in_addr addr; 707 in_port_t port = 0; 708 TCPDEBUG0; 709 710 if (so->so_state & SS_ISDISCONNECTED) 711 return (ECONNABORTED); 712 713 inp = sotoinpcb(so); 714 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 715 INP_WLOCK(inp); 716 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 717 error = ECONNABORTED; 718 goto out; 719 } 720 tp = intotcpcb(inp); 721 TCPDEBUG1(); 722 723 /* 724 * We inline in_getpeeraddr and COMMON_END here, so that we can 725 * copy the data of interest and defer the malloc until after we 726 * release the lock. 727 */ 728 port = inp->inp_fport; 729 addr = inp->inp_faddr; 730 731 out: 732 TCPDEBUG2(PRU_ACCEPT); 733 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 734 INP_WUNLOCK(inp); 735 if (error == 0) 736 *nam = in_sockaddr(port, &addr); 737 return error; 738 } 739 #endif /* INET */ 740 741 #ifdef INET6 742 static int 743 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 744 { 745 struct inpcb *inp = NULL; 746 int error = 0; 747 struct tcpcb *tp = NULL; 748 struct in_addr addr; 749 struct in6_addr addr6; 750 in_port_t port = 0; 751 int v4 = 0; 752 TCPDEBUG0; 753 754 if (so->so_state & SS_ISDISCONNECTED) 755 return (ECONNABORTED); 756 757 inp = sotoinpcb(so); 758 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 759 INP_INFO_RLOCK(&V_tcbinfo); 760 INP_WLOCK(inp); 761 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 762 error = ECONNABORTED; 763 goto out; 764 } 765 tp = intotcpcb(inp); 766 TCPDEBUG1(); 767 768 /* 769 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 770 * copy the data of interest and defer the malloc until after we 771 * release the lock. 772 */ 773 if (inp->inp_vflag & INP_IPV4) { 774 v4 = 1; 775 port = inp->inp_fport; 776 addr = inp->inp_faddr; 777 } else { 778 port = inp->inp_fport; 779 addr6 = inp->in6p_faddr; 780 } 781 782 out: 783 TCPDEBUG2(PRU_ACCEPT); 784 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 785 INP_WUNLOCK(inp); 786 INP_INFO_RUNLOCK(&V_tcbinfo); 787 if (error == 0) { 788 if (v4) 789 *nam = in6_v4mapsin6_sockaddr(port, &addr); 790 else 791 *nam = in6_sockaddr(port, &addr6); 792 } 793 return error; 794 } 795 #endif /* INET6 */ 796 797 /* 798 * Mark the connection as being incapable of further output. 799 */ 800 static int 801 tcp_usr_shutdown(struct socket *so) 802 { 803 int error = 0; 804 struct inpcb *inp; 805 struct tcpcb *tp = NULL; 806 807 TCPDEBUG0; 808 INP_INFO_RLOCK(&V_tcbinfo); 809 inp = sotoinpcb(so); 810 KASSERT(inp != NULL, ("inp == NULL")); 811 INP_WLOCK(inp); 812 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 813 error = ECONNRESET; 814 goto out; 815 } 816 tp = intotcpcb(inp); 817 TCPDEBUG1(); 818 socantsendmore(so); 819 tcp_usrclosed(tp); 820 if (!(inp->inp_flags & INP_DROPPED)) 821 error = tp->t_fb->tfb_tcp_output(tp); 822 823 out: 824 TCPDEBUG2(PRU_SHUTDOWN); 825 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 826 INP_WUNLOCK(inp); 827 INP_INFO_RUNLOCK(&V_tcbinfo); 828 829 return (error); 830 } 831 832 /* 833 * After a receive, possibly send window update to peer. 834 */ 835 static int 836 tcp_usr_rcvd(struct socket *so, int flags) 837 { 838 struct inpcb *inp; 839 struct tcpcb *tp = NULL; 840 int error = 0; 841 842 TCPDEBUG0; 843 inp = sotoinpcb(so); 844 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 845 INP_WLOCK(inp); 846 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 847 error = ECONNRESET; 848 goto out; 849 } 850 tp = intotcpcb(inp); 851 TCPDEBUG1(); 852 /* 853 * For passively-created TFO connections, don't attempt a window 854 * update while still in SYN_RECEIVED as this may trigger an early 855 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 856 * application response data, or failing that, when the DELACK timer 857 * expires. 858 */ 859 if (IS_FASTOPEN(tp->t_flags) && 860 (tp->t_state == TCPS_SYN_RECEIVED)) 861 goto out; 862 #ifdef TCP_OFFLOAD 863 if (tp->t_flags & TF_TOE) 864 tcp_offload_rcvd(tp); 865 else 866 #endif 867 tp->t_fb->tfb_tcp_output(tp); 868 869 out: 870 TCPDEBUG2(PRU_RCVD); 871 TCP_PROBE2(debug__user, tp, PRU_RCVD); 872 INP_WUNLOCK(inp); 873 return (error); 874 } 875 876 /* 877 * Do a send by putting data in output queue and updating urgent 878 * marker if URG set. Possibly send more data. Unlike the other 879 * pru_*() routines, the mbuf chains are our responsibility. We 880 * must either enqueue them or free them. The other pru_* routines 881 * generally are caller-frees. 882 */ 883 static int 884 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 885 struct sockaddr *nam, struct mbuf *control, struct thread *td) 886 { 887 int error = 0; 888 struct inpcb *inp; 889 struct tcpcb *tp = NULL; 890 #ifdef INET6 891 int isipv6; 892 #endif 893 TCPDEBUG0; 894 895 /* 896 * We require the pcbinfo lock if we will close the socket as part of 897 * this call. 898 */ 899 if (flags & PRUS_EOF) 900 INP_INFO_RLOCK(&V_tcbinfo); 901 inp = sotoinpcb(so); 902 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 903 INP_WLOCK(inp); 904 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 905 if (control) 906 m_freem(control); 907 /* 908 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 909 * for freeing memory. 910 */ 911 if (m && (flags & PRUS_NOTREADY) == 0) 912 m_freem(m); 913 error = ECONNRESET; 914 goto out; 915 } 916 #ifdef INET6 917 isipv6 = nam && nam->sa_family == AF_INET6; 918 #endif /* INET6 */ 919 tp = intotcpcb(inp); 920 TCPDEBUG1(); 921 if (control) { 922 /* TCP doesn't do control messages (rights, creds, etc) */ 923 if (control->m_len) { 924 m_freem(control); 925 if (m) 926 m_freem(m); 927 error = EINVAL; 928 goto out; 929 } 930 m_freem(control); /* empty control, just free it */ 931 } 932 if (!(flags & PRUS_OOB)) { 933 sbappendstream(&so->so_snd, m, flags); 934 if (nam && tp->t_state < TCPS_SYN_SENT) { 935 /* 936 * Do implied connect if not yet connected, 937 * initialize window to default value, and 938 * initialize maxseg using peer's cached MSS. 939 */ 940 #ifdef INET6 941 if (isipv6) 942 error = tcp6_connect(tp, nam, td); 943 #endif /* INET6 */ 944 #if defined(INET6) && defined(INET) 945 else 946 #endif 947 #ifdef INET 948 error = tcp_connect(tp, nam, td); 949 #endif 950 if (error) 951 goto out; 952 if (IS_FASTOPEN(tp->t_flags)) 953 tcp_fastopen_connect(tp); 954 else { 955 tp->snd_wnd = TTCP_CLIENT_SND_WND; 956 tcp_mss(tp, -1); 957 } 958 } 959 if (flags & PRUS_EOF) { 960 /* 961 * Close the send side of the connection after 962 * the data is sent. 963 */ 964 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 965 socantsendmore(so); 966 tcp_usrclosed(tp); 967 } 968 if (!(inp->inp_flags & INP_DROPPED) && 969 !(flags & PRUS_NOTREADY)) { 970 if (flags & PRUS_MORETOCOME) 971 tp->t_flags |= TF_MORETOCOME; 972 error = tp->t_fb->tfb_tcp_output(tp); 973 if (flags & PRUS_MORETOCOME) 974 tp->t_flags &= ~TF_MORETOCOME; 975 } 976 } else { 977 /* 978 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 979 */ 980 SOCKBUF_LOCK(&so->so_snd); 981 if (sbspace(&so->so_snd) < -512) { 982 SOCKBUF_UNLOCK(&so->so_snd); 983 m_freem(m); 984 error = ENOBUFS; 985 goto out; 986 } 987 /* 988 * According to RFC961 (Assigned Protocols), 989 * the urgent pointer points to the last octet 990 * of urgent data. We continue, however, 991 * to consider it to indicate the first octet 992 * of data past the urgent section. 993 * Otherwise, snd_up should be one lower. 994 */ 995 sbappendstream_locked(&so->so_snd, m, flags); 996 SOCKBUF_UNLOCK(&so->so_snd); 997 if (nam && tp->t_state < TCPS_SYN_SENT) { 998 /* 999 * Do implied connect if not yet connected, 1000 * initialize window to default value, and 1001 * initialize maxseg using peer's cached MSS. 1002 */ 1003 1004 /* 1005 * Not going to contemplate SYN|URG 1006 */ 1007 if (IS_FASTOPEN(tp->t_flags)) 1008 tp->t_flags &= ~TF_FASTOPEN; 1009 #ifdef INET6 1010 if (isipv6) 1011 error = tcp6_connect(tp, nam, td); 1012 #endif /* INET6 */ 1013 #if defined(INET6) && defined(INET) 1014 else 1015 #endif 1016 #ifdef INET 1017 error = tcp_connect(tp, nam, td); 1018 #endif 1019 if (error) 1020 goto out; 1021 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1022 tcp_mss(tp, -1); 1023 } 1024 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1025 if (!(flags & PRUS_NOTREADY)) { 1026 tp->t_flags |= TF_FORCEDATA; 1027 error = tp->t_fb->tfb_tcp_output(tp); 1028 tp->t_flags &= ~TF_FORCEDATA; 1029 } 1030 } 1031 TCP_LOG_EVENT(tp, NULL, 1032 &inp->inp_socket->so_rcv, 1033 &inp->inp_socket->so_snd, 1034 TCP_LOG_USERSEND, error, 1035 0, NULL, false); 1036 out: 1037 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1038 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1039 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1040 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1041 INP_WUNLOCK(inp); 1042 if (flags & PRUS_EOF) 1043 INP_INFO_RUNLOCK(&V_tcbinfo); 1044 return (error); 1045 } 1046 1047 static int 1048 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1049 { 1050 struct inpcb *inp; 1051 struct tcpcb *tp; 1052 int error; 1053 1054 inp = sotoinpcb(so); 1055 INP_WLOCK(inp); 1056 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1057 INP_WUNLOCK(inp); 1058 for (int i = 0; i < count; i++) 1059 m = m_free(m); 1060 return (ECONNRESET); 1061 } 1062 tp = intotcpcb(inp); 1063 1064 SOCKBUF_LOCK(&so->so_snd); 1065 error = sbready(&so->so_snd, m, count); 1066 SOCKBUF_UNLOCK(&so->so_snd); 1067 if (error == 0) 1068 error = tp->t_fb->tfb_tcp_output(tp); 1069 INP_WUNLOCK(inp); 1070 1071 return (error); 1072 } 1073 1074 /* 1075 * Abort the TCP. Drop the connection abruptly. 1076 */ 1077 static void 1078 tcp_usr_abort(struct socket *so) 1079 { 1080 struct inpcb *inp; 1081 struct tcpcb *tp = NULL; 1082 TCPDEBUG0; 1083 1084 inp = sotoinpcb(so); 1085 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1086 1087 INP_INFO_RLOCK(&V_tcbinfo); 1088 INP_WLOCK(inp); 1089 KASSERT(inp->inp_socket != NULL, 1090 ("tcp_usr_abort: inp_socket == NULL")); 1091 1092 /* 1093 * If we still have full TCP state, and we're not dropped, drop. 1094 */ 1095 if (!(inp->inp_flags & INP_TIMEWAIT) && 1096 !(inp->inp_flags & INP_DROPPED)) { 1097 tp = intotcpcb(inp); 1098 TCPDEBUG1(); 1099 tp = tcp_drop(tp, ECONNABORTED); 1100 if (tp == NULL) 1101 goto dropped; 1102 TCPDEBUG2(PRU_ABORT); 1103 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1104 } 1105 if (!(inp->inp_flags & INP_DROPPED)) { 1106 SOCK_LOCK(so); 1107 so->so_state |= SS_PROTOREF; 1108 SOCK_UNLOCK(so); 1109 inp->inp_flags |= INP_SOCKREF; 1110 } 1111 INP_WUNLOCK(inp); 1112 dropped: 1113 INP_INFO_RUNLOCK(&V_tcbinfo); 1114 } 1115 1116 /* 1117 * TCP socket is closed. Start friendly disconnect. 1118 */ 1119 static void 1120 tcp_usr_close(struct socket *so) 1121 { 1122 struct inpcb *inp; 1123 struct tcpcb *tp = NULL; 1124 TCPDEBUG0; 1125 1126 inp = sotoinpcb(so); 1127 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1128 1129 INP_INFO_RLOCK(&V_tcbinfo); 1130 INP_WLOCK(inp); 1131 KASSERT(inp->inp_socket != NULL, 1132 ("tcp_usr_close: inp_socket == NULL")); 1133 1134 /* 1135 * If we still have full TCP state, and we're not dropped, initiate 1136 * a disconnect. 1137 */ 1138 if (!(inp->inp_flags & INP_TIMEWAIT) && 1139 !(inp->inp_flags & INP_DROPPED)) { 1140 tp = intotcpcb(inp); 1141 TCPDEBUG1(); 1142 tcp_disconnect(tp); 1143 TCPDEBUG2(PRU_CLOSE); 1144 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1145 } 1146 if (!(inp->inp_flags & INP_DROPPED)) { 1147 SOCK_LOCK(so); 1148 so->so_state |= SS_PROTOREF; 1149 SOCK_UNLOCK(so); 1150 inp->inp_flags |= INP_SOCKREF; 1151 } 1152 INP_WUNLOCK(inp); 1153 INP_INFO_RUNLOCK(&V_tcbinfo); 1154 } 1155 1156 /* 1157 * Receive out-of-band data. 1158 */ 1159 static int 1160 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1161 { 1162 int error = 0; 1163 struct inpcb *inp; 1164 struct tcpcb *tp = NULL; 1165 1166 TCPDEBUG0; 1167 inp = sotoinpcb(so); 1168 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1169 INP_WLOCK(inp); 1170 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1171 error = ECONNRESET; 1172 goto out; 1173 } 1174 tp = intotcpcb(inp); 1175 TCPDEBUG1(); 1176 if ((so->so_oobmark == 0 && 1177 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1178 so->so_options & SO_OOBINLINE || 1179 tp->t_oobflags & TCPOOB_HADDATA) { 1180 error = EINVAL; 1181 goto out; 1182 } 1183 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1184 error = EWOULDBLOCK; 1185 goto out; 1186 } 1187 m->m_len = 1; 1188 *mtod(m, caddr_t) = tp->t_iobc; 1189 if ((flags & MSG_PEEK) == 0) 1190 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1191 1192 out: 1193 TCPDEBUG2(PRU_RCVOOB); 1194 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1195 INP_WUNLOCK(inp); 1196 return (error); 1197 } 1198 1199 #ifdef INET 1200 struct pr_usrreqs tcp_usrreqs = { 1201 .pru_abort = tcp_usr_abort, 1202 .pru_accept = tcp_usr_accept, 1203 .pru_attach = tcp_usr_attach, 1204 .pru_bind = tcp_usr_bind, 1205 .pru_connect = tcp_usr_connect, 1206 .pru_control = in_control, 1207 .pru_detach = tcp_usr_detach, 1208 .pru_disconnect = tcp_usr_disconnect, 1209 .pru_listen = tcp_usr_listen, 1210 .pru_peeraddr = in_getpeeraddr, 1211 .pru_rcvd = tcp_usr_rcvd, 1212 .pru_rcvoob = tcp_usr_rcvoob, 1213 .pru_send = tcp_usr_send, 1214 .pru_ready = tcp_usr_ready, 1215 .pru_shutdown = tcp_usr_shutdown, 1216 .pru_sockaddr = in_getsockaddr, 1217 .pru_sosetlabel = in_pcbsosetlabel, 1218 .pru_close = tcp_usr_close, 1219 }; 1220 #endif /* INET */ 1221 1222 #ifdef INET6 1223 struct pr_usrreqs tcp6_usrreqs = { 1224 .pru_abort = tcp_usr_abort, 1225 .pru_accept = tcp6_usr_accept, 1226 .pru_attach = tcp_usr_attach, 1227 .pru_bind = tcp6_usr_bind, 1228 .pru_connect = tcp6_usr_connect, 1229 .pru_control = in6_control, 1230 .pru_detach = tcp_usr_detach, 1231 .pru_disconnect = tcp_usr_disconnect, 1232 .pru_listen = tcp6_usr_listen, 1233 .pru_peeraddr = in6_mapped_peeraddr, 1234 .pru_rcvd = tcp_usr_rcvd, 1235 .pru_rcvoob = tcp_usr_rcvoob, 1236 .pru_send = tcp_usr_send, 1237 .pru_ready = tcp_usr_ready, 1238 .pru_shutdown = tcp_usr_shutdown, 1239 .pru_sockaddr = in6_mapped_sockaddr, 1240 .pru_sosetlabel = in_pcbsosetlabel, 1241 .pru_close = tcp_usr_close, 1242 }; 1243 #endif /* INET6 */ 1244 1245 #ifdef INET 1246 /* 1247 * Common subroutine to open a TCP connection to remote host specified 1248 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1249 * port number if needed. Call in_pcbconnect_setup to do the routing and 1250 * to choose a local host address (interface). If there is an existing 1251 * incarnation of the same connection in TIME-WAIT state and if the remote 1252 * host was sending CC options and if the connection duration was < MSL, then 1253 * truncate the previous TIME-WAIT state and proceed. 1254 * Initialize connection parameters and enter SYN-SENT state. 1255 */ 1256 static int 1257 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1258 { 1259 struct inpcb *inp = tp->t_inpcb, *oinp; 1260 struct socket *so = inp->inp_socket; 1261 struct in_addr laddr; 1262 u_short lport; 1263 int error; 1264 1265 INP_WLOCK_ASSERT(inp); 1266 INP_HASH_WLOCK(&V_tcbinfo); 1267 1268 if (inp->inp_lport == 0) { 1269 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1270 if (error) 1271 goto out; 1272 } 1273 1274 /* 1275 * Cannot simply call in_pcbconnect, because there might be an 1276 * earlier incarnation of this same connection still in 1277 * TIME_WAIT state, creating an ADDRINUSE error. 1278 */ 1279 laddr = inp->inp_laddr; 1280 lport = inp->inp_lport; 1281 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1282 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1283 if (error && oinp == NULL) 1284 goto out; 1285 if (oinp) { 1286 error = EADDRINUSE; 1287 goto out; 1288 } 1289 inp->inp_laddr = laddr; 1290 in_pcbrehash(inp); 1291 INP_HASH_WUNLOCK(&V_tcbinfo); 1292 1293 /* 1294 * Compute window scaling to request: 1295 * Scale to fit into sweet spot. See tcp_syncache.c. 1296 * XXX: This should move to tcp_output(). 1297 */ 1298 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1299 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1300 tp->request_r_scale++; 1301 1302 soisconnecting(so); 1303 TCPSTAT_INC(tcps_connattempt); 1304 tcp_state_change(tp, TCPS_SYN_SENT); 1305 tp->iss = tcp_new_isn(tp); 1306 tcp_sendseqinit(tp); 1307 1308 return 0; 1309 1310 out: 1311 INP_HASH_WUNLOCK(&V_tcbinfo); 1312 return (error); 1313 } 1314 #endif /* INET */ 1315 1316 #ifdef INET6 1317 static int 1318 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1319 { 1320 struct inpcb *inp = tp->t_inpcb; 1321 int error; 1322 1323 INP_WLOCK_ASSERT(inp); 1324 INP_HASH_WLOCK(&V_tcbinfo); 1325 1326 if (inp->inp_lport == 0) { 1327 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1328 if (error) 1329 goto out; 1330 } 1331 error = in6_pcbconnect(inp, nam, td->td_ucred); 1332 if (error != 0) 1333 goto out; 1334 INP_HASH_WUNLOCK(&V_tcbinfo); 1335 1336 /* Compute window scaling to request. */ 1337 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1338 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1339 tp->request_r_scale++; 1340 1341 soisconnecting(inp->inp_socket); 1342 TCPSTAT_INC(tcps_connattempt); 1343 tcp_state_change(tp, TCPS_SYN_SENT); 1344 tp->iss = tcp_new_isn(tp); 1345 tcp_sendseqinit(tp); 1346 1347 return 0; 1348 1349 out: 1350 INP_HASH_WUNLOCK(&V_tcbinfo); 1351 return error; 1352 } 1353 #endif /* INET6 */ 1354 1355 /* 1356 * Export TCP internal state information via a struct tcp_info, based on the 1357 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1358 * (TCP state machine, etc). We export all information using FreeBSD-native 1359 * constants -- for example, the numeric values for tcpi_state will differ 1360 * from Linux. 1361 */ 1362 static void 1363 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1364 { 1365 1366 INP_WLOCK_ASSERT(tp->t_inpcb); 1367 bzero(ti, sizeof(*ti)); 1368 1369 ti->tcpi_state = tp->t_state; 1370 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1371 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1372 if (tp->t_flags & TF_SACK_PERMIT) 1373 ti->tcpi_options |= TCPI_OPT_SACK; 1374 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1375 ti->tcpi_options |= TCPI_OPT_WSCALE; 1376 ti->tcpi_snd_wscale = tp->snd_scale; 1377 ti->tcpi_rcv_wscale = tp->rcv_scale; 1378 } 1379 if (tp->t_flags & TF_ECN_PERMIT) 1380 ti->tcpi_options |= TCPI_OPT_ECN; 1381 1382 ti->tcpi_rto = tp->t_rxtcur * tick; 1383 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1384 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1385 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1386 1387 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1388 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1389 1390 /* 1391 * FreeBSD-specific extension fields for tcp_info. 1392 */ 1393 ti->tcpi_rcv_space = tp->rcv_wnd; 1394 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1395 ti->tcpi_snd_wnd = tp->snd_wnd; 1396 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1397 ti->tcpi_snd_nxt = tp->snd_nxt; 1398 ti->tcpi_snd_mss = tp->t_maxseg; 1399 ti->tcpi_rcv_mss = tp->t_maxseg; 1400 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1401 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1402 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1403 #ifdef TCP_OFFLOAD 1404 if (tp->t_flags & TF_TOE) { 1405 ti->tcpi_options |= TCPI_OPT_TOE; 1406 tcp_offload_tcp_info(tp, ti); 1407 } 1408 #endif 1409 } 1410 1411 /* 1412 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1413 * socket option arguments. When it re-acquires the lock after the copy, it 1414 * has to revalidate that the connection is still valid for the socket 1415 * option. 1416 */ 1417 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1418 INP_WLOCK(inp); \ 1419 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1420 INP_WUNLOCK(inp); \ 1421 cleanup; \ 1422 return (ECONNRESET); \ 1423 } \ 1424 tp = intotcpcb(inp); \ 1425 } while(0) 1426 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1427 1428 int 1429 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1430 { 1431 int error; 1432 struct inpcb *inp; 1433 struct tcpcb *tp; 1434 struct tcp_function_block *blk; 1435 struct tcp_function_set fsn; 1436 1437 error = 0; 1438 inp = sotoinpcb(so); 1439 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1440 INP_WLOCK(inp); 1441 if (sopt->sopt_level != IPPROTO_TCP) { 1442 #ifdef INET6 1443 if (inp->inp_vflag & INP_IPV6PROTO) { 1444 INP_WUNLOCK(inp); 1445 error = ip6_ctloutput(so, sopt); 1446 } 1447 #endif /* INET6 */ 1448 #if defined(INET6) && defined(INET) 1449 else 1450 #endif 1451 #ifdef INET 1452 { 1453 INP_WUNLOCK(inp); 1454 error = ip_ctloutput(so, sopt); 1455 } 1456 #endif 1457 return (error); 1458 } 1459 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1460 INP_WUNLOCK(inp); 1461 return (ECONNRESET); 1462 } 1463 tp = intotcpcb(inp); 1464 /* 1465 * Protect the TCP option TCP_FUNCTION_BLK so 1466 * that a sub-function can *never* overwrite this. 1467 */ 1468 if ((sopt->sopt_dir == SOPT_SET) && 1469 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1470 INP_WUNLOCK(inp); 1471 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1472 sizeof fsn); 1473 if (error) 1474 return (error); 1475 INP_WLOCK_RECHECK(inp); 1476 blk = find_and_ref_tcp_functions(&fsn); 1477 if (blk == NULL) { 1478 INP_WUNLOCK(inp); 1479 return (ENOENT); 1480 } 1481 if (tp->t_fb == blk) { 1482 /* You already have this */ 1483 refcount_release(&blk->tfb_refcnt); 1484 INP_WUNLOCK(inp); 1485 return (0); 1486 } 1487 if (tp->t_state != TCPS_CLOSED) { 1488 int error=EINVAL; 1489 /* 1490 * The user has advanced the state 1491 * past the initial point, we may not 1492 * be able to switch. 1493 */ 1494 if (blk->tfb_tcp_handoff_ok != NULL) { 1495 /* 1496 * Does the stack provide a 1497 * query mechanism, if so it may 1498 * still be possible? 1499 */ 1500 error = (*blk->tfb_tcp_handoff_ok)(tp); 1501 } 1502 if (error) { 1503 refcount_release(&blk->tfb_refcnt); 1504 INP_WUNLOCK(inp); 1505 return(error); 1506 } 1507 } 1508 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1509 refcount_release(&blk->tfb_refcnt); 1510 INP_WUNLOCK(inp); 1511 return (ENOENT); 1512 } 1513 /* 1514 * Release the old refcnt, the 1515 * lookup acquired a ref on the 1516 * new one already. 1517 */ 1518 if (tp->t_fb->tfb_tcp_fb_fini) { 1519 /* 1520 * Tell the stack to cleanup with 0 i.e. 1521 * the tcb is not going away. 1522 */ 1523 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1524 } 1525 #ifdef TCPHPTS 1526 /* Assure that we are not on any hpts */ 1527 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1528 #endif 1529 if (blk->tfb_tcp_fb_init) { 1530 error = (*blk->tfb_tcp_fb_init)(tp); 1531 if (error) { 1532 refcount_release(&blk->tfb_refcnt); 1533 if (tp->t_fb->tfb_tcp_fb_init) { 1534 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1535 /* Fall back failed, drop the connection */ 1536 INP_WUNLOCK(inp); 1537 soabort(so); 1538 return(error); 1539 } 1540 } 1541 goto err_out; 1542 } 1543 } 1544 refcount_release(&tp->t_fb->tfb_refcnt); 1545 tp->t_fb = blk; 1546 #ifdef TCP_OFFLOAD 1547 if (tp->t_flags & TF_TOE) { 1548 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1549 sopt->sopt_name); 1550 } 1551 #endif 1552 err_out: 1553 INP_WUNLOCK(inp); 1554 return (error); 1555 } else if ((sopt->sopt_dir == SOPT_GET) && 1556 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1557 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1558 TCP_FUNCTION_NAME_LEN_MAX); 1559 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1560 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1561 INP_WUNLOCK(inp); 1562 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1563 return (error); 1564 } 1565 /* Pass in the INP locked, called must unlock it */ 1566 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1567 } 1568 1569 /* 1570 * If this assert becomes untrue, we need to change the size of the buf 1571 * variable in tcp_default_ctloutput(). 1572 */ 1573 #ifdef CTASSERT 1574 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1575 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1576 #endif 1577 1578 int 1579 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1580 { 1581 int error, opt, optval; 1582 u_int ui; 1583 struct tcp_info ti; 1584 struct cc_algo *algo; 1585 char *pbuf, buf[TCP_LOG_ID_LEN]; 1586 size_t len; 1587 1588 /* 1589 * For TCP_CCALGOOPT forward the control to CC module, for both 1590 * SOPT_SET and SOPT_GET. 1591 */ 1592 switch (sopt->sopt_name) { 1593 case TCP_CCALGOOPT: 1594 INP_WUNLOCK(inp); 1595 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1596 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1597 sopt->sopt_valsize); 1598 if (error) { 1599 free(pbuf, M_TEMP); 1600 return (error); 1601 } 1602 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1603 if (CC_ALGO(tp)->ctl_output != NULL) 1604 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1605 else 1606 error = ENOENT; 1607 INP_WUNLOCK(inp); 1608 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1609 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1610 free(pbuf, M_TEMP); 1611 return (error); 1612 } 1613 1614 switch (sopt->sopt_dir) { 1615 case SOPT_SET: 1616 switch (sopt->sopt_name) { 1617 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1618 case TCP_MD5SIG: 1619 if (!TCPMD5_ENABLED()) { 1620 INP_WUNLOCK(inp); 1621 return (ENOPROTOOPT); 1622 } 1623 error = TCPMD5_PCBCTL(inp, sopt); 1624 if (error) 1625 return (error); 1626 goto unlock_and_done; 1627 #endif /* IPSEC */ 1628 1629 case TCP_NODELAY: 1630 case TCP_NOOPT: 1631 INP_WUNLOCK(inp); 1632 error = sooptcopyin(sopt, &optval, sizeof optval, 1633 sizeof optval); 1634 if (error) 1635 return (error); 1636 1637 INP_WLOCK_RECHECK(inp); 1638 switch (sopt->sopt_name) { 1639 case TCP_NODELAY: 1640 opt = TF_NODELAY; 1641 break; 1642 case TCP_NOOPT: 1643 opt = TF_NOOPT; 1644 break; 1645 default: 1646 opt = 0; /* dead code to fool gcc */ 1647 break; 1648 } 1649 1650 if (optval) 1651 tp->t_flags |= opt; 1652 else 1653 tp->t_flags &= ~opt; 1654 unlock_and_done: 1655 #ifdef TCP_OFFLOAD 1656 if (tp->t_flags & TF_TOE) { 1657 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1658 sopt->sopt_name); 1659 } 1660 #endif 1661 INP_WUNLOCK(inp); 1662 break; 1663 1664 case TCP_NOPUSH: 1665 INP_WUNLOCK(inp); 1666 error = sooptcopyin(sopt, &optval, sizeof optval, 1667 sizeof optval); 1668 if (error) 1669 return (error); 1670 1671 INP_WLOCK_RECHECK(inp); 1672 if (optval) 1673 tp->t_flags |= TF_NOPUSH; 1674 else if (tp->t_flags & TF_NOPUSH) { 1675 tp->t_flags &= ~TF_NOPUSH; 1676 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1677 error = tp->t_fb->tfb_tcp_output(tp); 1678 } 1679 goto unlock_and_done; 1680 1681 case TCP_MAXSEG: 1682 INP_WUNLOCK(inp); 1683 error = sooptcopyin(sopt, &optval, sizeof optval, 1684 sizeof optval); 1685 if (error) 1686 return (error); 1687 1688 INP_WLOCK_RECHECK(inp); 1689 if (optval > 0 && optval <= tp->t_maxseg && 1690 optval + 40 >= V_tcp_minmss) 1691 tp->t_maxseg = optval; 1692 else 1693 error = EINVAL; 1694 goto unlock_and_done; 1695 1696 case TCP_INFO: 1697 INP_WUNLOCK(inp); 1698 error = EINVAL; 1699 break; 1700 1701 case TCP_CONGESTION: 1702 INP_WUNLOCK(inp); 1703 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1704 if (error) 1705 break; 1706 buf[sopt->sopt_valsize] = '\0'; 1707 INP_WLOCK_RECHECK(inp); 1708 CC_LIST_RLOCK(); 1709 STAILQ_FOREACH(algo, &cc_list, entries) 1710 if (strncmp(buf, algo->name, 1711 TCP_CA_NAME_MAX) == 0) 1712 break; 1713 CC_LIST_RUNLOCK(); 1714 if (algo == NULL) { 1715 INP_WUNLOCK(inp); 1716 error = EINVAL; 1717 break; 1718 } 1719 /* 1720 * We hold a write lock over the tcb so it's safe to 1721 * do these things without ordering concerns. 1722 */ 1723 if (CC_ALGO(tp)->cb_destroy != NULL) 1724 CC_ALGO(tp)->cb_destroy(tp->ccv); 1725 CC_ALGO(tp) = algo; 1726 /* 1727 * If something goes pear shaped initialising the new 1728 * algo, fall back to newreno (which does not 1729 * require initialisation). 1730 */ 1731 if (algo->cb_init != NULL && 1732 algo->cb_init(tp->ccv) != 0) { 1733 CC_ALGO(tp) = &newreno_cc_algo; 1734 /* 1735 * The only reason init should fail is 1736 * because of malloc. 1737 */ 1738 error = ENOMEM; 1739 } 1740 INP_WUNLOCK(inp); 1741 break; 1742 1743 case TCP_KEEPIDLE: 1744 case TCP_KEEPINTVL: 1745 case TCP_KEEPINIT: 1746 INP_WUNLOCK(inp); 1747 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1748 if (error) 1749 return (error); 1750 1751 if (ui > (UINT_MAX / hz)) { 1752 error = EINVAL; 1753 break; 1754 } 1755 ui *= hz; 1756 1757 INP_WLOCK_RECHECK(inp); 1758 switch (sopt->sopt_name) { 1759 case TCP_KEEPIDLE: 1760 tp->t_keepidle = ui; 1761 /* 1762 * XXX: better check current remaining 1763 * timeout and "merge" it with new value. 1764 */ 1765 if ((tp->t_state > TCPS_LISTEN) && 1766 (tp->t_state <= TCPS_CLOSING)) 1767 tcp_timer_activate(tp, TT_KEEP, 1768 TP_KEEPIDLE(tp)); 1769 break; 1770 case TCP_KEEPINTVL: 1771 tp->t_keepintvl = ui; 1772 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1773 (TP_MAXIDLE(tp) > 0)) 1774 tcp_timer_activate(tp, TT_2MSL, 1775 TP_MAXIDLE(tp)); 1776 break; 1777 case TCP_KEEPINIT: 1778 tp->t_keepinit = ui; 1779 if (tp->t_state == TCPS_SYN_RECEIVED || 1780 tp->t_state == TCPS_SYN_SENT) 1781 tcp_timer_activate(tp, TT_KEEP, 1782 TP_KEEPINIT(tp)); 1783 break; 1784 } 1785 goto unlock_and_done; 1786 1787 case TCP_KEEPCNT: 1788 INP_WUNLOCK(inp); 1789 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1790 if (error) 1791 return (error); 1792 1793 INP_WLOCK_RECHECK(inp); 1794 tp->t_keepcnt = ui; 1795 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1796 (TP_MAXIDLE(tp) > 0)) 1797 tcp_timer_activate(tp, TT_2MSL, 1798 TP_MAXIDLE(tp)); 1799 goto unlock_and_done; 1800 1801 #ifdef TCPPCAP 1802 case TCP_PCAP_OUT: 1803 case TCP_PCAP_IN: 1804 INP_WUNLOCK(inp); 1805 error = sooptcopyin(sopt, &optval, sizeof optval, 1806 sizeof optval); 1807 if (error) 1808 return (error); 1809 1810 INP_WLOCK_RECHECK(inp); 1811 if (optval >= 0) 1812 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1813 &(tp->t_outpkts) : &(tp->t_inpkts), 1814 optval); 1815 else 1816 error = EINVAL; 1817 goto unlock_and_done; 1818 #endif 1819 1820 case TCP_FASTOPEN: { 1821 struct tcp_fastopen tfo_optval; 1822 1823 INP_WUNLOCK(inp); 1824 if (!V_tcp_fastopen_client_enable && 1825 !V_tcp_fastopen_server_enable) 1826 return (EPERM); 1827 1828 error = sooptcopyin(sopt, &tfo_optval, 1829 sizeof(tfo_optval), sizeof(int)); 1830 if (error) 1831 return (error); 1832 1833 INP_WLOCK_RECHECK(inp); 1834 if (tfo_optval.enable) { 1835 if (tp->t_state == TCPS_LISTEN) { 1836 if (!V_tcp_fastopen_server_enable) { 1837 error = EPERM; 1838 goto unlock_and_done; 1839 } 1840 1841 tp->t_flags |= TF_FASTOPEN; 1842 if (tp->t_tfo_pending == NULL) 1843 tp->t_tfo_pending = 1844 tcp_fastopen_alloc_counter(); 1845 } else { 1846 /* 1847 * If a pre-shared key was provided, 1848 * stash it in the client cookie 1849 * field of the tcpcb for use during 1850 * connect. 1851 */ 1852 if (sopt->sopt_valsize == 1853 sizeof(tfo_optval)) { 1854 memcpy(tp->t_tfo_cookie.client, 1855 tfo_optval.psk, 1856 TCP_FASTOPEN_PSK_LEN); 1857 tp->t_tfo_client_cookie_len = 1858 TCP_FASTOPEN_PSK_LEN; 1859 } 1860 tp->t_flags |= TF_FASTOPEN; 1861 } 1862 } else 1863 tp->t_flags &= ~TF_FASTOPEN; 1864 goto unlock_and_done; 1865 } 1866 1867 #ifdef TCP_BLACKBOX 1868 case TCP_LOG: 1869 INP_WUNLOCK(inp); 1870 error = sooptcopyin(sopt, &optval, sizeof optval, 1871 sizeof optval); 1872 if (error) 1873 return (error); 1874 1875 INP_WLOCK_RECHECK(inp); 1876 error = tcp_log_state_change(tp, optval); 1877 goto unlock_and_done; 1878 1879 case TCP_LOGBUF: 1880 INP_WUNLOCK(inp); 1881 error = EINVAL; 1882 break; 1883 1884 case TCP_LOGID: 1885 INP_WUNLOCK(inp); 1886 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 1887 if (error) 1888 break; 1889 buf[sopt->sopt_valsize] = '\0'; 1890 INP_WLOCK_RECHECK(inp); 1891 error = tcp_log_set_id(tp, buf); 1892 /* tcp_log_set_id() unlocks the INP. */ 1893 break; 1894 1895 case TCP_LOGDUMP: 1896 case TCP_LOGDUMPID: 1897 INP_WUNLOCK(inp); 1898 error = 1899 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 1900 if (error) 1901 break; 1902 buf[sopt->sopt_valsize] = '\0'; 1903 INP_WLOCK_RECHECK(inp); 1904 if (sopt->sopt_name == TCP_LOGDUMP) { 1905 error = tcp_log_dump_tp_logbuf(tp, buf, 1906 M_WAITOK, true); 1907 INP_WUNLOCK(inp); 1908 } else { 1909 tcp_log_dump_tp_bucket_logbufs(tp, buf); 1910 /* 1911 * tcp_log_dump_tp_bucket_logbufs() drops the 1912 * INP lock. 1913 */ 1914 } 1915 break; 1916 #endif 1917 1918 default: 1919 INP_WUNLOCK(inp); 1920 error = ENOPROTOOPT; 1921 break; 1922 } 1923 break; 1924 1925 case SOPT_GET: 1926 tp = intotcpcb(inp); 1927 switch (sopt->sopt_name) { 1928 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1929 case TCP_MD5SIG: 1930 if (!TCPMD5_ENABLED()) { 1931 INP_WUNLOCK(inp); 1932 return (ENOPROTOOPT); 1933 } 1934 error = TCPMD5_PCBCTL(inp, sopt); 1935 break; 1936 #endif 1937 1938 case TCP_NODELAY: 1939 optval = tp->t_flags & TF_NODELAY; 1940 INP_WUNLOCK(inp); 1941 error = sooptcopyout(sopt, &optval, sizeof optval); 1942 break; 1943 case TCP_MAXSEG: 1944 optval = tp->t_maxseg; 1945 INP_WUNLOCK(inp); 1946 error = sooptcopyout(sopt, &optval, sizeof optval); 1947 break; 1948 case TCP_NOOPT: 1949 optval = tp->t_flags & TF_NOOPT; 1950 INP_WUNLOCK(inp); 1951 error = sooptcopyout(sopt, &optval, sizeof optval); 1952 break; 1953 case TCP_NOPUSH: 1954 optval = tp->t_flags & TF_NOPUSH; 1955 INP_WUNLOCK(inp); 1956 error = sooptcopyout(sopt, &optval, sizeof optval); 1957 break; 1958 case TCP_INFO: 1959 tcp_fill_info(tp, &ti); 1960 INP_WUNLOCK(inp); 1961 error = sooptcopyout(sopt, &ti, sizeof ti); 1962 break; 1963 case TCP_CONGESTION: 1964 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1965 INP_WUNLOCK(inp); 1966 error = sooptcopyout(sopt, buf, len + 1); 1967 break; 1968 case TCP_KEEPIDLE: 1969 case TCP_KEEPINTVL: 1970 case TCP_KEEPINIT: 1971 case TCP_KEEPCNT: 1972 switch (sopt->sopt_name) { 1973 case TCP_KEEPIDLE: 1974 ui = TP_KEEPIDLE(tp) / hz; 1975 break; 1976 case TCP_KEEPINTVL: 1977 ui = TP_KEEPINTVL(tp) / hz; 1978 break; 1979 case TCP_KEEPINIT: 1980 ui = TP_KEEPINIT(tp) / hz; 1981 break; 1982 case TCP_KEEPCNT: 1983 ui = TP_KEEPCNT(tp); 1984 break; 1985 } 1986 INP_WUNLOCK(inp); 1987 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1988 break; 1989 #ifdef TCPPCAP 1990 case TCP_PCAP_OUT: 1991 case TCP_PCAP_IN: 1992 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1993 &(tp->t_outpkts) : &(tp->t_inpkts)); 1994 INP_WUNLOCK(inp); 1995 error = sooptcopyout(sopt, &optval, sizeof optval); 1996 break; 1997 #endif 1998 case TCP_FASTOPEN: 1999 optval = tp->t_flags & TF_FASTOPEN; 2000 INP_WUNLOCK(inp); 2001 error = sooptcopyout(sopt, &optval, sizeof optval); 2002 break; 2003 #ifdef TCP_BLACKBOX 2004 case TCP_LOG: 2005 optval = tp->t_logstate; 2006 INP_WUNLOCK(inp); 2007 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2008 break; 2009 case TCP_LOGBUF: 2010 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2011 error = tcp_log_getlogbuf(sopt, tp); 2012 break; 2013 case TCP_LOGID: 2014 len = tcp_log_get_id(tp, buf); 2015 INP_WUNLOCK(inp); 2016 error = sooptcopyout(sopt, buf, len + 1); 2017 break; 2018 case TCP_LOGDUMP: 2019 case TCP_LOGDUMPID: 2020 INP_WUNLOCK(inp); 2021 error = EINVAL; 2022 break; 2023 #endif 2024 default: 2025 INP_WUNLOCK(inp); 2026 error = ENOPROTOOPT; 2027 break; 2028 } 2029 break; 2030 } 2031 return (error); 2032 } 2033 #undef INP_WLOCK_RECHECK 2034 #undef INP_WLOCK_RECHECK_CLEANUP 2035 2036 /* 2037 * Attach TCP protocol to socket, allocating 2038 * internet protocol control block, tcp control block, 2039 * bufer space, and entering LISTEN state if to accept connections. 2040 */ 2041 static int 2042 tcp_attach(struct socket *so) 2043 { 2044 struct tcpcb *tp; 2045 struct inpcb *inp; 2046 int error; 2047 2048 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 2049 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 2050 if (error) 2051 return (error); 2052 } 2053 so->so_rcv.sb_flags |= SB_AUTOSIZE; 2054 so->so_snd.sb_flags |= SB_AUTOSIZE; 2055 INP_INFO_RLOCK(&V_tcbinfo); 2056 error = in_pcballoc(so, &V_tcbinfo); 2057 if (error) { 2058 INP_INFO_RUNLOCK(&V_tcbinfo); 2059 return (error); 2060 } 2061 inp = sotoinpcb(so); 2062 #ifdef INET6 2063 if (inp->inp_vflag & INP_IPV6PROTO) { 2064 inp->inp_vflag |= INP_IPV6; 2065 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 2066 inp->inp_vflag |= INP_IPV4; 2067 inp->in6p_hops = -1; /* use kernel default */ 2068 } 2069 else 2070 #endif 2071 inp->inp_vflag |= INP_IPV4; 2072 tp = tcp_newtcpcb(inp); 2073 if (tp == NULL) { 2074 in_pcbdetach(inp); 2075 in_pcbfree(inp); 2076 INP_INFO_RUNLOCK(&V_tcbinfo); 2077 return (ENOBUFS); 2078 } 2079 tp->t_state = TCPS_CLOSED; 2080 INP_WUNLOCK(inp); 2081 INP_INFO_RUNLOCK(&V_tcbinfo); 2082 TCPSTATES_INC(TCPS_CLOSED); 2083 return (0); 2084 } 2085 2086 /* 2087 * Initiate (or continue) disconnect. 2088 * If embryonic state, just send reset (once). 2089 * If in ``let data drain'' option and linger null, just drop. 2090 * Otherwise (hard), mark socket disconnecting and drop 2091 * current input data; switch states based on user close, and 2092 * send segment to peer (with FIN). 2093 */ 2094 static void 2095 tcp_disconnect(struct tcpcb *tp) 2096 { 2097 struct inpcb *inp = tp->t_inpcb; 2098 struct socket *so = inp->inp_socket; 2099 2100 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 2101 INP_WLOCK_ASSERT(inp); 2102 2103 /* 2104 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2105 * socket is still open. 2106 */ 2107 if (tp->t_state < TCPS_ESTABLISHED) { 2108 tp = tcp_close(tp); 2109 KASSERT(tp != NULL, 2110 ("tcp_disconnect: tcp_close() returned NULL")); 2111 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2112 tp = tcp_drop(tp, 0); 2113 KASSERT(tp != NULL, 2114 ("tcp_disconnect: tcp_drop() returned NULL")); 2115 } else { 2116 soisdisconnecting(so); 2117 sbflush(&so->so_rcv); 2118 tcp_usrclosed(tp); 2119 if (!(inp->inp_flags & INP_DROPPED)) 2120 tp->t_fb->tfb_tcp_output(tp); 2121 } 2122 } 2123 2124 /* 2125 * User issued close, and wish to trail through shutdown states: 2126 * if never received SYN, just forget it. If got a SYN from peer, 2127 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2128 * If already got a FIN from peer, then almost done; go to LAST_ACK 2129 * state. In all other cases, have already sent FIN to peer (e.g. 2130 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2131 * for peer to send FIN or not respond to keep-alives, etc. 2132 * We can let the user exit from the close as soon as the FIN is acked. 2133 */ 2134 static void 2135 tcp_usrclosed(struct tcpcb *tp) 2136 { 2137 2138 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 2139 INP_WLOCK_ASSERT(tp->t_inpcb); 2140 2141 switch (tp->t_state) { 2142 case TCPS_LISTEN: 2143 #ifdef TCP_OFFLOAD 2144 tcp_offload_listen_stop(tp); 2145 #endif 2146 tcp_state_change(tp, TCPS_CLOSED); 2147 /* FALLTHROUGH */ 2148 case TCPS_CLOSED: 2149 tp = tcp_close(tp); 2150 /* 2151 * tcp_close() should never return NULL here as the socket is 2152 * still open. 2153 */ 2154 KASSERT(tp != NULL, 2155 ("tcp_usrclosed: tcp_close() returned NULL")); 2156 break; 2157 2158 case TCPS_SYN_SENT: 2159 case TCPS_SYN_RECEIVED: 2160 tp->t_flags |= TF_NEEDFIN; 2161 break; 2162 2163 case TCPS_ESTABLISHED: 2164 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2165 break; 2166 2167 case TCPS_CLOSE_WAIT: 2168 tcp_state_change(tp, TCPS_LAST_ACK); 2169 break; 2170 } 2171 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2172 soisdisconnected(tp->t_inpcb->inp_socket); 2173 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2174 if (tp->t_state == TCPS_FIN_WAIT_2) { 2175 int timeout; 2176 2177 timeout = (tcp_fast_finwait2_recycle) ? 2178 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2179 tcp_timer_activate(tp, TT_2MSL, timeout); 2180 } 2181 } 2182 } 2183 2184 #ifdef DDB 2185 static void 2186 db_print_indent(int indent) 2187 { 2188 int i; 2189 2190 for (i = 0; i < indent; i++) 2191 db_printf(" "); 2192 } 2193 2194 static void 2195 db_print_tstate(int t_state) 2196 { 2197 2198 switch (t_state) { 2199 case TCPS_CLOSED: 2200 db_printf("TCPS_CLOSED"); 2201 return; 2202 2203 case TCPS_LISTEN: 2204 db_printf("TCPS_LISTEN"); 2205 return; 2206 2207 case TCPS_SYN_SENT: 2208 db_printf("TCPS_SYN_SENT"); 2209 return; 2210 2211 case TCPS_SYN_RECEIVED: 2212 db_printf("TCPS_SYN_RECEIVED"); 2213 return; 2214 2215 case TCPS_ESTABLISHED: 2216 db_printf("TCPS_ESTABLISHED"); 2217 return; 2218 2219 case TCPS_CLOSE_WAIT: 2220 db_printf("TCPS_CLOSE_WAIT"); 2221 return; 2222 2223 case TCPS_FIN_WAIT_1: 2224 db_printf("TCPS_FIN_WAIT_1"); 2225 return; 2226 2227 case TCPS_CLOSING: 2228 db_printf("TCPS_CLOSING"); 2229 return; 2230 2231 case TCPS_LAST_ACK: 2232 db_printf("TCPS_LAST_ACK"); 2233 return; 2234 2235 case TCPS_FIN_WAIT_2: 2236 db_printf("TCPS_FIN_WAIT_2"); 2237 return; 2238 2239 case TCPS_TIME_WAIT: 2240 db_printf("TCPS_TIME_WAIT"); 2241 return; 2242 2243 default: 2244 db_printf("unknown"); 2245 return; 2246 } 2247 } 2248 2249 static void 2250 db_print_tflags(u_int t_flags) 2251 { 2252 int comma; 2253 2254 comma = 0; 2255 if (t_flags & TF_ACKNOW) { 2256 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2257 comma = 1; 2258 } 2259 if (t_flags & TF_DELACK) { 2260 db_printf("%sTF_DELACK", comma ? ", " : ""); 2261 comma = 1; 2262 } 2263 if (t_flags & TF_NODELAY) { 2264 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2265 comma = 1; 2266 } 2267 if (t_flags & TF_NOOPT) { 2268 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2269 comma = 1; 2270 } 2271 if (t_flags & TF_SENTFIN) { 2272 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2273 comma = 1; 2274 } 2275 if (t_flags & TF_REQ_SCALE) { 2276 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2277 comma = 1; 2278 } 2279 if (t_flags & TF_RCVD_SCALE) { 2280 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2281 comma = 1; 2282 } 2283 if (t_flags & TF_REQ_TSTMP) { 2284 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2285 comma = 1; 2286 } 2287 if (t_flags & TF_RCVD_TSTMP) { 2288 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2289 comma = 1; 2290 } 2291 if (t_flags & TF_SACK_PERMIT) { 2292 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2293 comma = 1; 2294 } 2295 if (t_flags & TF_NEEDSYN) { 2296 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2297 comma = 1; 2298 } 2299 if (t_flags & TF_NEEDFIN) { 2300 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2301 comma = 1; 2302 } 2303 if (t_flags & TF_NOPUSH) { 2304 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2305 comma = 1; 2306 } 2307 if (t_flags & TF_MORETOCOME) { 2308 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2309 comma = 1; 2310 } 2311 if (t_flags & TF_LQ_OVERFLOW) { 2312 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2313 comma = 1; 2314 } 2315 if (t_flags & TF_LASTIDLE) { 2316 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2317 comma = 1; 2318 } 2319 if (t_flags & TF_RXWIN0SENT) { 2320 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2321 comma = 1; 2322 } 2323 if (t_flags & TF_FASTRECOVERY) { 2324 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2325 comma = 1; 2326 } 2327 if (t_flags & TF_CONGRECOVERY) { 2328 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2329 comma = 1; 2330 } 2331 if (t_flags & TF_WASFRECOVERY) { 2332 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2333 comma = 1; 2334 } 2335 if (t_flags & TF_SIGNATURE) { 2336 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2337 comma = 1; 2338 } 2339 if (t_flags & TF_FORCEDATA) { 2340 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2341 comma = 1; 2342 } 2343 if (t_flags & TF_TSO) { 2344 db_printf("%sTF_TSO", comma ? ", " : ""); 2345 comma = 1; 2346 } 2347 if (t_flags & TF_ECN_PERMIT) { 2348 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2349 comma = 1; 2350 } 2351 if (t_flags & TF_FASTOPEN) { 2352 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2353 comma = 1; 2354 } 2355 } 2356 2357 static void 2358 db_print_toobflags(char t_oobflags) 2359 { 2360 int comma; 2361 2362 comma = 0; 2363 if (t_oobflags & TCPOOB_HAVEDATA) { 2364 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2365 comma = 1; 2366 } 2367 if (t_oobflags & TCPOOB_HADDATA) { 2368 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2369 comma = 1; 2370 } 2371 } 2372 2373 static void 2374 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2375 { 2376 2377 db_print_indent(indent); 2378 db_printf("%s at %p\n", name, tp); 2379 2380 indent += 2; 2381 2382 db_print_indent(indent); 2383 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2384 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2385 2386 db_print_indent(indent); 2387 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2388 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2389 2390 db_print_indent(indent); 2391 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2392 &tp->t_timers->tt_delack, tp->t_inpcb); 2393 2394 db_print_indent(indent); 2395 db_printf("t_state: %d (", tp->t_state); 2396 db_print_tstate(tp->t_state); 2397 db_printf(")\n"); 2398 2399 db_print_indent(indent); 2400 db_printf("t_flags: 0x%x (", tp->t_flags); 2401 db_print_tflags(tp->t_flags); 2402 db_printf(")\n"); 2403 2404 db_print_indent(indent); 2405 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2406 tp->snd_una, tp->snd_max, tp->snd_nxt); 2407 2408 db_print_indent(indent); 2409 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2410 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2411 2412 db_print_indent(indent); 2413 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2414 tp->iss, tp->irs, tp->rcv_nxt); 2415 2416 db_print_indent(indent); 2417 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2418 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2419 2420 db_print_indent(indent); 2421 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2422 tp->snd_wnd, tp->snd_cwnd); 2423 2424 db_print_indent(indent); 2425 db_printf("snd_ssthresh: %u snd_recover: " 2426 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2427 2428 db_print_indent(indent); 2429 db_printf("t_rcvtime: %u t_startime: %u\n", 2430 tp->t_rcvtime, tp->t_starttime); 2431 2432 db_print_indent(indent); 2433 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2434 tp->t_rtttime, tp->t_rtseq); 2435 2436 db_print_indent(indent); 2437 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2438 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2439 2440 db_print_indent(indent); 2441 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2442 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2443 tp->t_rttbest); 2444 2445 db_print_indent(indent); 2446 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2447 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2448 2449 db_print_indent(indent); 2450 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2451 db_print_toobflags(tp->t_oobflags); 2452 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2453 2454 db_print_indent(indent); 2455 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2456 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2457 2458 db_print_indent(indent); 2459 db_printf("ts_recent: %u ts_recent_age: %u\n", 2460 tp->ts_recent, tp->ts_recent_age); 2461 2462 db_print_indent(indent); 2463 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2464 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2465 2466 db_print_indent(indent); 2467 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2468 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2469 tp->snd_recover_prev, tp->t_badrxtwin); 2470 2471 db_print_indent(indent); 2472 db_printf("snd_numholes: %d snd_holes first: %p\n", 2473 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2474 2475 db_print_indent(indent); 2476 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2477 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2478 2479 /* Skip sackblks, sackhint. */ 2480 2481 db_print_indent(indent); 2482 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2483 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2484 } 2485 2486 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2487 { 2488 struct tcpcb *tp; 2489 2490 if (!have_addr) { 2491 db_printf("usage: show tcpcb <addr>\n"); 2492 return; 2493 } 2494 tp = (struct tcpcb *)addr; 2495 2496 db_print_tcpcb(tp, "tcpcb", 0); 2497 } 2498 #endif 2499