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_kern_tls.h" 48 #include "opt_tcpdebug.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/arb.h> 53 #include <sys/limits.h> 54 #include <sys/malloc.h> 55 #include <sys/refcount.h> 56 #include <sys/kernel.h> 57 #include <sys/ktls.h> 58 #include <sys/qmath.h> 59 #include <sys/sysctl.h> 60 #include <sys/mbuf.h> 61 #ifdef INET6 62 #include <sys/domain.h> 63 #endif /* INET6 */ 64 #include <sys/socket.h> 65 #include <sys/socketvar.h> 66 #include <sys/protosw.h> 67 #include <sys/proc.h> 68 #include <sys/jail.h> 69 #include <sys/syslog.h> 70 #include <sys/stats.h> 71 72 #ifdef DDB 73 #include <ddb/ddb.h> 74 #endif 75 76 #include <net/if.h> 77 #include <net/if_var.h> 78 #include <net/route.h> 79 #include <net/vnet.h> 80 81 #include <netinet/in.h> 82 #include <netinet/in_kdtrace.h> 83 #include <netinet/in_pcb.h> 84 #include <netinet/in_systm.h> 85 #include <netinet/in_var.h> 86 #include <netinet/ip_var.h> 87 #ifdef INET6 88 #include <netinet/ip6.h> 89 #include <netinet6/in6_pcb.h> 90 #include <netinet6/ip6_var.h> 91 #include <netinet6/scope6_var.h> 92 #endif 93 #include <netinet/tcp.h> 94 #include <netinet/tcp_fsm.h> 95 #include <netinet/tcp_seq.h> 96 #include <netinet/tcp_timer.h> 97 #include <netinet/tcp_var.h> 98 #include <netinet/tcp_log_buf.h> 99 #include <netinet/tcpip.h> 100 #include <netinet/cc/cc.h> 101 #include <netinet/tcp_fastopen.h> 102 #include <netinet/tcp_hpts.h> 103 #ifdef TCPPCAP 104 #include <netinet/tcp_pcap.h> 105 #endif 106 #ifdef TCPDEBUG 107 #include <netinet/tcp_debug.h> 108 #endif 109 #ifdef TCP_OFFLOAD 110 #include <netinet/tcp_offload.h> 111 #endif 112 #include <netipsec/ipsec_support.h> 113 114 #include <vm/vm.h> 115 #include <vm/vm_param.h> 116 #include <vm/pmap.h> 117 #include <vm/vm_extern.h> 118 #include <vm/vm_map.h> 119 #include <vm/vm_page.h> 120 121 /* 122 * TCP protocol interface to socket abstraction. 123 */ 124 static int tcp_attach(struct socket *); 125 #ifdef INET 126 static int tcp_connect(struct tcpcb *, struct sockaddr *, 127 struct thread *td); 128 #endif /* INET */ 129 #ifdef INET6 130 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 131 struct thread *td); 132 #endif /* INET6 */ 133 static void tcp_disconnect(struct tcpcb *); 134 static void tcp_usrclosed(struct tcpcb *); 135 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 136 137 #ifdef TCPDEBUG 138 #define TCPDEBUG0 int ostate = 0 139 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 140 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 141 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 142 #else 143 #define TCPDEBUG0 144 #define TCPDEBUG1() 145 #define TCPDEBUG2(req) 146 #endif 147 148 /* 149 * TCP attaches to socket via pru_attach(), reserving space, 150 * and an internet control block. 151 */ 152 static int 153 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 154 { 155 struct inpcb *inp; 156 struct tcpcb *tp = NULL; 157 int error; 158 TCPDEBUG0; 159 160 inp = sotoinpcb(so); 161 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 162 TCPDEBUG1(); 163 164 error = tcp_attach(so); 165 if (error) 166 goto out; 167 168 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 169 so->so_linger = TCP_LINGERTIME; 170 171 inp = sotoinpcb(so); 172 tp = intotcpcb(inp); 173 out: 174 TCPDEBUG2(PRU_ATTACH); 175 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 176 return error; 177 } 178 179 /* 180 * tcp_detach is called when the socket layer loses its final reference 181 * to the socket, be it a file descriptor reference, a reference from TCP, 182 * etc. At this point, there is only one case in which we will keep around 183 * inpcb state: time wait. 184 * 185 * This function can probably be re-absorbed back into tcp_usr_detach() now 186 * that there is a single detach path. 187 */ 188 static void 189 tcp_detach(struct socket *so, struct inpcb *inp) 190 { 191 struct tcpcb *tp; 192 193 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 194 INP_WLOCK_ASSERT(inp); 195 196 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 197 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 198 199 tp = intotcpcb(inp); 200 201 if (inp->inp_flags & INP_TIMEWAIT) { 202 /* 203 * There are two cases to handle: one in which the time wait 204 * state is being discarded (INP_DROPPED), and one in which 205 * this connection will remain in timewait. In the former, 206 * it is time to discard all state (except tcptw, which has 207 * already been discarded by the timewait close code, which 208 * should be further up the call stack somewhere). In the 209 * latter case, we detach from the socket, but leave the pcb 210 * present until timewait ends. 211 * 212 * XXXRW: Would it be cleaner to free the tcptw here? 213 * 214 * Astute question indeed, from twtcp perspective there are 215 * four cases to consider: 216 * 217 * #1 tcp_detach is called at tcptw creation time by 218 * tcp_twstart, then do not discard the newly created tcptw 219 * and leave inpcb present until timewait ends 220 * #2 tcp_detach is called at tcptw creation time by 221 * tcp_twstart, but connection is local and tw will be 222 * discarded immediately 223 * #3 tcp_detach is called at timewait end (or reuse) by 224 * tcp_twclose, then the tcptw has already been discarded 225 * (or reused) and inpcb is freed here 226 * #4 tcp_detach is called() after timewait ends (or reuse) 227 * (e.g. by soclose), then tcptw has already been discarded 228 * (or reused) and inpcb is freed here 229 * 230 * In all three cases the tcptw should not be freed here. 231 */ 232 if (inp->inp_flags & INP_DROPPED) { 233 in_pcbdetach(inp); 234 if (__predict_true(tp == NULL)) { 235 in_pcbfree(inp); 236 } else { 237 /* 238 * This case should not happen as in TIMEWAIT 239 * state the inp should not be destroyed before 240 * its tcptw. If INVARIANTS is defined, panic. 241 */ 242 #ifdef INVARIANTS 243 panic("%s: Panic before an inp double-free: " 244 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 245 , __func__); 246 #else 247 log(LOG_ERR, "%s: Avoid an inp double-free: " 248 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 249 , __func__); 250 #endif 251 INP_WUNLOCK(inp); 252 } 253 } else { 254 in_pcbdetach(inp); 255 INP_WUNLOCK(inp); 256 } 257 } else { 258 /* 259 * If the connection is not in timewait, we consider two 260 * two conditions: one in which no further processing is 261 * necessary (dropped || embryonic), and one in which TCP is 262 * not yet done, but no longer requires the socket, so the 263 * pcb will persist for the time being. 264 * 265 * XXXRW: Does the second case still occur? 266 */ 267 if (inp->inp_flags & INP_DROPPED || 268 tp->t_state < TCPS_SYN_SENT) { 269 tcp_discardcb(tp); 270 in_pcbdetach(inp); 271 in_pcbfree(inp); 272 } else { 273 in_pcbdetach(inp); 274 INP_WUNLOCK(inp); 275 } 276 } 277 } 278 279 /* 280 * pru_detach() detaches the TCP protocol from the socket. 281 * If the protocol state is non-embryonic, then can't 282 * do this directly: have to initiate a pru_disconnect(), 283 * which may finish later; embryonic TCB's can just 284 * be discarded here. 285 */ 286 static void 287 tcp_usr_detach(struct socket *so) 288 { 289 struct inpcb *inp; 290 int rlock = 0; 291 struct epoch_tracker et; 292 293 inp = sotoinpcb(so); 294 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 295 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 296 NET_EPOCH_ENTER(et); 297 rlock = 1; 298 } 299 INP_WLOCK(inp); 300 KASSERT(inp->inp_socket != NULL, 301 ("tcp_usr_detach: inp_socket == NULL")); 302 tcp_detach(so, inp); 303 if (rlock) 304 NET_EPOCH_EXIT(et); 305 } 306 307 #ifdef INET 308 /* 309 * Give the socket an address. 310 */ 311 static int 312 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 313 { 314 int error = 0; 315 struct inpcb *inp; 316 struct tcpcb *tp = NULL; 317 struct sockaddr_in *sinp; 318 319 sinp = (struct sockaddr_in *)nam; 320 if (nam->sa_len != sizeof (*sinp)) 321 return (EINVAL); 322 /* 323 * Must check for multicast addresses and disallow binding 324 * to them. 325 */ 326 if (sinp->sin_family == AF_INET && 327 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 328 return (EAFNOSUPPORT); 329 330 TCPDEBUG0; 331 inp = sotoinpcb(so); 332 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 333 INP_WLOCK(inp); 334 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 335 error = EINVAL; 336 goto out; 337 } 338 tp = intotcpcb(inp); 339 TCPDEBUG1(); 340 INP_HASH_WLOCK(&V_tcbinfo); 341 error = in_pcbbind(inp, nam, td->td_ucred); 342 INP_HASH_WUNLOCK(&V_tcbinfo); 343 out: 344 TCPDEBUG2(PRU_BIND); 345 TCP_PROBE2(debug__user, tp, PRU_BIND); 346 INP_WUNLOCK(inp); 347 348 return (error); 349 } 350 #endif /* INET */ 351 352 #ifdef INET6 353 static int 354 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 355 { 356 int error = 0; 357 struct inpcb *inp; 358 struct tcpcb *tp = NULL; 359 struct sockaddr_in6 *sin6; 360 u_char vflagsav; 361 362 sin6 = (struct sockaddr_in6 *)nam; 363 if (nam->sa_len != sizeof (*sin6)) 364 return (EINVAL); 365 /* 366 * Must check for multicast addresses and disallow binding 367 * to them. 368 */ 369 if (sin6->sin6_family == AF_INET6 && 370 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 371 return (EAFNOSUPPORT); 372 373 TCPDEBUG0; 374 inp = sotoinpcb(so); 375 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 376 INP_WLOCK(inp); 377 vflagsav = inp->inp_vflag; 378 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 379 error = EINVAL; 380 goto out; 381 } 382 tp = intotcpcb(inp); 383 TCPDEBUG1(); 384 INP_HASH_WLOCK(&V_tcbinfo); 385 inp->inp_vflag &= ~INP_IPV4; 386 inp->inp_vflag |= INP_IPV6; 387 #ifdef INET 388 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 389 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 390 inp->inp_vflag |= INP_IPV4; 391 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 392 struct sockaddr_in sin; 393 394 in6_sin6_2_sin(&sin, sin6); 395 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 396 error = EAFNOSUPPORT; 397 INP_HASH_WUNLOCK(&V_tcbinfo); 398 goto out; 399 } 400 inp->inp_vflag |= INP_IPV4; 401 inp->inp_vflag &= ~INP_IPV6; 402 error = in_pcbbind(inp, (struct sockaddr *)&sin, 403 td->td_ucred); 404 INP_HASH_WUNLOCK(&V_tcbinfo); 405 goto out; 406 } 407 } 408 #endif 409 error = in6_pcbbind(inp, nam, td->td_ucred); 410 INP_HASH_WUNLOCK(&V_tcbinfo); 411 out: 412 if (error != 0) 413 inp->inp_vflag = vflagsav; 414 TCPDEBUG2(PRU_BIND); 415 TCP_PROBE2(debug__user, tp, PRU_BIND); 416 INP_WUNLOCK(inp); 417 return (error); 418 } 419 #endif /* INET6 */ 420 421 #ifdef INET 422 /* 423 * Prepare to accept connections. 424 */ 425 static int 426 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 427 { 428 int error = 0; 429 struct inpcb *inp; 430 struct tcpcb *tp = NULL; 431 432 TCPDEBUG0; 433 inp = sotoinpcb(so); 434 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 435 INP_WLOCK(inp); 436 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 437 error = EINVAL; 438 goto out; 439 } 440 tp = intotcpcb(inp); 441 TCPDEBUG1(); 442 SOCK_LOCK(so); 443 error = solisten_proto_check(so); 444 INP_HASH_WLOCK(&V_tcbinfo); 445 if (error == 0 && inp->inp_lport == 0) 446 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 447 INP_HASH_WUNLOCK(&V_tcbinfo); 448 if (error == 0) { 449 tcp_state_change(tp, TCPS_LISTEN); 450 solisten_proto(so, backlog); 451 #ifdef TCP_OFFLOAD 452 if ((so->so_options & SO_NO_OFFLOAD) == 0) 453 tcp_offload_listen_start(tp); 454 #endif 455 } 456 SOCK_UNLOCK(so); 457 458 if (IS_FASTOPEN(tp->t_flags)) 459 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 460 461 out: 462 TCPDEBUG2(PRU_LISTEN); 463 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 464 INP_WUNLOCK(inp); 465 return (error); 466 } 467 #endif /* INET */ 468 469 #ifdef INET6 470 static int 471 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 472 { 473 int error = 0; 474 struct inpcb *inp; 475 struct tcpcb *tp = NULL; 476 u_char vflagsav; 477 478 TCPDEBUG0; 479 inp = sotoinpcb(so); 480 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 481 INP_WLOCK(inp); 482 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 483 error = EINVAL; 484 goto out; 485 } 486 vflagsav = inp->inp_vflag; 487 tp = intotcpcb(inp); 488 TCPDEBUG1(); 489 SOCK_LOCK(so); 490 error = solisten_proto_check(so); 491 INP_HASH_WLOCK(&V_tcbinfo); 492 if (error == 0 && inp->inp_lport == 0) { 493 inp->inp_vflag &= ~INP_IPV4; 494 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 495 inp->inp_vflag |= INP_IPV4; 496 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 497 } 498 INP_HASH_WUNLOCK(&V_tcbinfo); 499 if (error == 0) { 500 tcp_state_change(tp, TCPS_LISTEN); 501 solisten_proto(so, backlog); 502 #ifdef TCP_OFFLOAD 503 if ((so->so_options & SO_NO_OFFLOAD) == 0) 504 tcp_offload_listen_start(tp); 505 #endif 506 } 507 SOCK_UNLOCK(so); 508 509 if (IS_FASTOPEN(tp->t_flags)) 510 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 511 512 if (error != 0) 513 inp->inp_vflag = vflagsav; 514 515 out: 516 TCPDEBUG2(PRU_LISTEN); 517 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 518 INP_WUNLOCK(inp); 519 return (error); 520 } 521 #endif /* INET6 */ 522 523 #ifdef INET 524 /* 525 * Initiate connection to peer. 526 * Create a template for use in transmissions on this connection. 527 * Enter SYN_SENT state, and mark socket as connecting. 528 * Start keep-alive timer, and seed output sequence space. 529 * Send initial segment on connection. 530 */ 531 static int 532 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 533 { 534 int error = 0; 535 struct inpcb *inp; 536 struct tcpcb *tp = NULL; 537 struct sockaddr_in *sinp; 538 539 sinp = (struct sockaddr_in *)nam; 540 if (nam->sa_len != sizeof (*sinp)) 541 return (EINVAL); 542 /* 543 * Must disallow TCP ``connections'' to multicast addresses. 544 */ 545 if (sinp->sin_family == AF_INET 546 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 547 return (EAFNOSUPPORT); 548 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 549 return (error); 550 551 TCPDEBUG0; 552 inp = sotoinpcb(so); 553 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 554 INP_WLOCK(inp); 555 if (inp->inp_flags & INP_TIMEWAIT) { 556 error = EADDRINUSE; 557 goto out; 558 } 559 if (inp->inp_flags & INP_DROPPED) { 560 error = ECONNREFUSED; 561 goto out; 562 } 563 tp = intotcpcb(inp); 564 TCPDEBUG1(); 565 if ((error = tcp_connect(tp, nam, td)) != 0) 566 goto out; 567 #ifdef TCP_OFFLOAD 568 if (registered_toedevs > 0 && 569 (so->so_options & SO_NO_OFFLOAD) == 0 && 570 (error = tcp_offload_connect(so, nam)) == 0) 571 goto out; 572 #endif 573 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 574 error = tp->t_fb->tfb_tcp_output(tp); 575 out: 576 TCPDEBUG2(PRU_CONNECT); 577 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 578 INP_WUNLOCK(inp); 579 return (error); 580 } 581 #endif /* INET */ 582 583 #ifdef INET6 584 static int 585 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 586 { 587 int error = 0; 588 struct inpcb *inp; 589 struct tcpcb *tp = NULL; 590 struct sockaddr_in6 *sin6; 591 u_int8_t incflagsav; 592 u_char vflagsav; 593 594 TCPDEBUG0; 595 596 sin6 = (struct sockaddr_in6 *)nam; 597 if (nam->sa_len != sizeof (*sin6)) 598 return (EINVAL); 599 /* 600 * Must disallow TCP ``connections'' to multicast addresses. 601 */ 602 if (sin6->sin6_family == AF_INET6 603 && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 604 return (EAFNOSUPPORT); 605 606 inp = sotoinpcb(so); 607 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 608 INP_WLOCK(inp); 609 vflagsav = inp->inp_vflag; 610 incflagsav = inp->inp_inc.inc_flags; 611 if (inp->inp_flags & INP_TIMEWAIT) { 612 error = EADDRINUSE; 613 goto out; 614 } 615 if (inp->inp_flags & INP_DROPPED) { 616 error = ECONNREFUSED; 617 goto out; 618 } 619 tp = intotcpcb(inp); 620 TCPDEBUG1(); 621 #ifdef INET 622 /* 623 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 624 * therefore probably require the hash lock, which isn't held here. 625 * Is this a significant problem? 626 */ 627 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 628 struct sockaddr_in sin; 629 630 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 631 error = EINVAL; 632 goto out; 633 } 634 if ((inp->inp_vflag & INP_IPV4) == 0) { 635 error = EAFNOSUPPORT; 636 goto out; 637 } 638 639 in6_sin6_2_sin(&sin, sin6); 640 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 641 error = EAFNOSUPPORT; 642 goto out; 643 } 644 if ((error = prison_remote_ip4(td->td_ucred, 645 &sin.sin_addr)) != 0) 646 goto out; 647 inp->inp_vflag |= INP_IPV4; 648 inp->inp_vflag &= ~INP_IPV6; 649 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 650 goto out; 651 #ifdef TCP_OFFLOAD 652 if (registered_toedevs > 0 && 653 (so->so_options & SO_NO_OFFLOAD) == 0 && 654 (error = tcp_offload_connect(so, nam)) == 0) 655 goto out; 656 #endif 657 error = tp->t_fb->tfb_tcp_output(tp); 658 goto out; 659 } else { 660 if ((inp->inp_vflag & INP_IPV6) == 0) { 661 error = EAFNOSUPPORT; 662 goto out; 663 } 664 } 665 #endif 666 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 667 goto out; 668 inp->inp_vflag &= ~INP_IPV4; 669 inp->inp_vflag |= INP_IPV6; 670 inp->inp_inc.inc_flags |= INC_ISIPV6; 671 if ((error = tcp6_connect(tp, nam, td)) != 0) 672 goto out; 673 #ifdef TCP_OFFLOAD 674 if (registered_toedevs > 0 && 675 (so->so_options & SO_NO_OFFLOAD) == 0 && 676 (error = tcp_offload_connect(so, nam)) == 0) 677 goto out; 678 #endif 679 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 680 error = tp->t_fb->tfb_tcp_output(tp); 681 682 out: 683 /* 684 * If the implicit bind in the connect call fails, restore 685 * the flags we modified. 686 */ 687 if (error != 0 && inp->inp_lport == 0) { 688 inp->inp_vflag = vflagsav; 689 inp->inp_inc.inc_flags = incflagsav; 690 } 691 692 TCPDEBUG2(PRU_CONNECT); 693 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 694 INP_WUNLOCK(inp); 695 return (error); 696 } 697 #endif /* INET6 */ 698 699 /* 700 * Initiate disconnect from peer. 701 * If connection never passed embryonic stage, just drop; 702 * else if don't need to let data drain, then can just drop anyways, 703 * else have to begin TCP shutdown process: mark socket disconnecting, 704 * drain unread data, state switch to reflect user close, and 705 * send segment (e.g. FIN) to peer. Socket will be really disconnected 706 * when peer sends FIN and acks ours. 707 * 708 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 709 */ 710 static int 711 tcp_usr_disconnect(struct socket *so) 712 { 713 struct inpcb *inp; 714 struct tcpcb *tp = NULL; 715 struct epoch_tracker et; 716 int error = 0; 717 718 TCPDEBUG0; 719 NET_EPOCH_ENTER(et); 720 inp = sotoinpcb(so); 721 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 722 INP_WLOCK(inp); 723 if (inp->inp_flags & INP_TIMEWAIT) 724 goto out; 725 if (inp->inp_flags & INP_DROPPED) { 726 error = ECONNRESET; 727 goto out; 728 } 729 tp = intotcpcb(inp); 730 TCPDEBUG1(); 731 tcp_disconnect(tp); 732 out: 733 TCPDEBUG2(PRU_DISCONNECT); 734 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 735 INP_WUNLOCK(inp); 736 NET_EPOCH_EXIT(et); 737 return (error); 738 } 739 740 #ifdef INET 741 /* 742 * Accept a connection. Essentially all the work is done at higher levels; 743 * just return the address of the peer, storing through addr. 744 */ 745 static int 746 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 747 { 748 int error = 0; 749 struct inpcb *inp = NULL; 750 struct tcpcb *tp = NULL; 751 struct in_addr addr; 752 in_port_t port = 0; 753 TCPDEBUG0; 754 755 if (so->so_state & SS_ISDISCONNECTED) 756 return (ECONNABORTED); 757 758 inp = sotoinpcb(so); 759 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 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 in_getpeeraddr 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 port = inp->inp_fport; 774 addr = inp->inp_faddr; 775 776 out: 777 TCPDEBUG2(PRU_ACCEPT); 778 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 779 INP_WUNLOCK(inp); 780 if (error == 0) 781 *nam = in_sockaddr(port, &addr); 782 return error; 783 } 784 #endif /* INET */ 785 786 #ifdef INET6 787 static int 788 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 789 { 790 struct inpcb *inp = NULL; 791 int error = 0; 792 struct tcpcb *tp = NULL; 793 struct in_addr addr; 794 struct in6_addr addr6; 795 struct epoch_tracker et; 796 in_port_t port = 0; 797 int v4 = 0; 798 TCPDEBUG0; 799 800 if (so->so_state & SS_ISDISCONNECTED) 801 return (ECONNABORTED); 802 803 inp = sotoinpcb(so); 804 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 805 NET_EPOCH_ENTER(et); 806 INP_WLOCK(inp); 807 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 808 error = ECONNABORTED; 809 goto out; 810 } 811 tp = intotcpcb(inp); 812 TCPDEBUG1(); 813 814 /* 815 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 816 * copy the data of interest and defer the malloc until after we 817 * release the lock. 818 */ 819 if (inp->inp_vflag & INP_IPV4) { 820 v4 = 1; 821 port = inp->inp_fport; 822 addr = inp->inp_faddr; 823 } else { 824 port = inp->inp_fport; 825 addr6 = inp->in6p_faddr; 826 } 827 828 out: 829 TCPDEBUG2(PRU_ACCEPT); 830 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 831 INP_WUNLOCK(inp); 832 NET_EPOCH_EXIT(et); 833 if (error == 0) { 834 if (v4) 835 *nam = in6_v4mapsin6_sockaddr(port, &addr); 836 else 837 *nam = in6_sockaddr(port, &addr6); 838 } 839 return error; 840 } 841 #endif /* INET6 */ 842 843 /* 844 * Mark the connection as being incapable of further output. 845 */ 846 static int 847 tcp_usr_shutdown(struct socket *so) 848 { 849 int error = 0; 850 struct inpcb *inp; 851 struct tcpcb *tp = NULL; 852 struct epoch_tracker et; 853 854 TCPDEBUG0; 855 NET_EPOCH_ENTER(et); 856 inp = sotoinpcb(so); 857 KASSERT(inp != NULL, ("inp == NULL")); 858 INP_WLOCK(inp); 859 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 860 error = ECONNRESET; 861 goto out; 862 } 863 tp = intotcpcb(inp); 864 TCPDEBUG1(); 865 socantsendmore(so); 866 tcp_usrclosed(tp); 867 if (!(inp->inp_flags & INP_DROPPED)) 868 error = tp->t_fb->tfb_tcp_output(tp); 869 870 out: 871 TCPDEBUG2(PRU_SHUTDOWN); 872 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 873 INP_WUNLOCK(inp); 874 NET_EPOCH_EXIT(et); 875 876 return (error); 877 } 878 879 /* 880 * After a receive, possibly send window update to peer. 881 */ 882 static int 883 tcp_usr_rcvd(struct socket *so, int flags) 884 { 885 struct inpcb *inp; 886 struct tcpcb *tp = NULL; 887 int error = 0; 888 889 TCPDEBUG0; 890 inp = sotoinpcb(so); 891 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 892 INP_WLOCK(inp); 893 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 894 error = ECONNRESET; 895 goto out; 896 } 897 tp = intotcpcb(inp); 898 TCPDEBUG1(); 899 /* 900 * For passively-created TFO connections, don't attempt a window 901 * update while still in SYN_RECEIVED as this may trigger an early 902 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 903 * application response data, or failing that, when the DELACK timer 904 * expires. 905 */ 906 if (IS_FASTOPEN(tp->t_flags) && 907 (tp->t_state == TCPS_SYN_RECEIVED)) 908 goto out; 909 #ifdef TCP_OFFLOAD 910 if (tp->t_flags & TF_TOE) 911 tcp_offload_rcvd(tp); 912 else 913 #endif 914 tp->t_fb->tfb_tcp_output(tp); 915 916 out: 917 TCPDEBUG2(PRU_RCVD); 918 TCP_PROBE2(debug__user, tp, PRU_RCVD); 919 INP_WUNLOCK(inp); 920 return (error); 921 } 922 923 /* 924 * Do a send by putting data in output queue and updating urgent 925 * marker if URG set. Possibly send more data. Unlike the other 926 * pru_*() routines, the mbuf chains are our responsibility. We 927 * must either enqueue them or free them. The other pru_* routines 928 * generally are caller-frees. 929 */ 930 static int 931 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 932 struct sockaddr *nam, struct mbuf *control, struct thread *td) 933 { 934 struct epoch_tracker et; 935 int error = 0; 936 struct inpcb *inp; 937 struct tcpcb *tp = NULL; 938 #ifdef INET 939 #ifdef INET6 940 struct sockaddr_in sin; 941 #endif 942 struct sockaddr_in *sinp; 943 #endif 944 #ifdef INET6 945 int isipv6; 946 #endif 947 u_int8_t incflagsav; 948 u_char vflagsav; 949 bool restoreflags; 950 TCPDEBUG0; 951 952 /* 953 * We require the pcbinfo "read lock" if we will close the socket 954 * as part of this call. 955 */ 956 if (flags & PRUS_EOF) 957 NET_EPOCH_ENTER(et); 958 inp = sotoinpcb(so); 959 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 960 INP_WLOCK(inp); 961 vflagsav = inp->inp_vflag; 962 incflagsav = inp->inp_inc.inc_flags; 963 restoreflags = false; 964 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 965 if (control) 966 m_freem(control); 967 /* 968 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 969 * for freeing memory. 970 */ 971 if (m && (flags & PRUS_NOTREADY) == 0) 972 m_freem(m); 973 error = ECONNRESET; 974 goto out; 975 } 976 tp = intotcpcb(inp); 977 TCPDEBUG1(); 978 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 979 switch (nam->sa_family) { 980 #ifdef INET 981 case AF_INET: 982 sinp = (struct sockaddr_in *)nam; 983 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 984 if (m) 985 m_freem(m); 986 error = EINVAL; 987 goto out; 988 } 989 if ((inp->inp_vflag & INP_IPV6) != 0) { 990 if (m) 991 m_freem(m); 992 error = EAFNOSUPPORT; 993 goto out; 994 } 995 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 996 if (m) 997 m_freem(m); 998 error = EAFNOSUPPORT; 999 goto out; 1000 } 1001 if ((error = prison_remote_ip4(td->td_ucred, 1002 &sinp->sin_addr))) { 1003 if (m) 1004 m_freem(m); 1005 goto out; 1006 } 1007 #ifdef INET6 1008 isipv6 = 0; 1009 #endif 1010 break; 1011 #endif /* INET */ 1012 #ifdef INET6 1013 case AF_INET6: 1014 { 1015 struct sockaddr_in6 *sin6; 1016 1017 sin6 = (struct sockaddr_in6 *)nam; 1018 if (sin6->sin6_len != sizeof(*sin6)) { 1019 if (m) 1020 m_freem(m); 1021 error = EINVAL; 1022 goto out; 1023 } 1024 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1025 if (m) 1026 m_freem(m); 1027 error = EAFNOSUPPORT; 1028 goto out; 1029 } 1030 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1031 #ifdef INET 1032 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1033 error = EINVAL; 1034 if (m) 1035 m_freem(m); 1036 goto out; 1037 } 1038 if ((inp->inp_vflag & INP_IPV4) == 0) { 1039 error = EAFNOSUPPORT; 1040 if (m) 1041 m_freem(m); 1042 goto out; 1043 } 1044 restoreflags = true; 1045 inp->inp_vflag &= ~INP_IPV6; 1046 sinp = &sin; 1047 in6_sin6_2_sin(sinp, sin6); 1048 if (IN_MULTICAST( 1049 ntohl(sinp->sin_addr.s_addr))) { 1050 error = EAFNOSUPPORT; 1051 if (m) 1052 m_freem(m); 1053 goto out; 1054 } 1055 if ((error = prison_remote_ip4(td->td_ucred, 1056 &sinp->sin_addr))) { 1057 if (m) 1058 m_freem(m); 1059 goto out; 1060 } 1061 isipv6 = 0; 1062 #else /* !INET */ 1063 error = EAFNOSUPPORT; 1064 if (m) 1065 m_freem(m); 1066 goto out; 1067 #endif /* INET */ 1068 } else { 1069 if ((inp->inp_vflag & INP_IPV6) == 0) { 1070 if (m) 1071 m_freem(m); 1072 error = EAFNOSUPPORT; 1073 goto out; 1074 } 1075 restoreflags = true; 1076 inp->inp_vflag &= ~INP_IPV4; 1077 inp->inp_inc.inc_flags |= INC_ISIPV6; 1078 if ((error = prison_remote_ip6(td->td_ucred, 1079 &sin6->sin6_addr))) { 1080 if (m) 1081 m_freem(m); 1082 goto out; 1083 } 1084 isipv6 = 1; 1085 } 1086 break; 1087 } 1088 #endif /* INET6 */ 1089 default: 1090 if (m) 1091 m_freem(m); 1092 error = EAFNOSUPPORT; 1093 goto out; 1094 } 1095 } 1096 if (control) { 1097 /* TCP doesn't do control messages (rights, creds, etc) */ 1098 if (control->m_len) { 1099 m_freem(control); 1100 if (m) 1101 m_freem(m); 1102 error = EINVAL; 1103 goto out; 1104 } 1105 m_freem(control); /* empty control, just free it */ 1106 } 1107 if (!(flags & PRUS_OOB)) { 1108 sbappendstream(&so->so_snd, m, flags); 1109 if (nam && tp->t_state < TCPS_SYN_SENT) { 1110 /* 1111 * Do implied connect if not yet connected, 1112 * initialize window to default value, and 1113 * initialize maxseg using peer's cached MSS. 1114 */ 1115 #ifdef INET6 1116 if (isipv6) 1117 error = tcp6_connect(tp, nam, td); 1118 #endif /* INET6 */ 1119 #if defined(INET6) && defined(INET) 1120 else 1121 #endif 1122 #ifdef INET 1123 error = tcp_connect(tp, 1124 (struct sockaddr *)sinp, td); 1125 #endif 1126 /* 1127 * The bind operation in tcp_connect succeeded. We 1128 * no longer want to restore the flags if later 1129 * operations fail. 1130 */ 1131 if (error == 0 || inp->inp_lport != 0) 1132 restoreflags = false; 1133 1134 if (error) 1135 goto out; 1136 if (IS_FASTOPEN(tp->t_flags)) 1137 tcp_fastopen_connect(tp); 1138 else { 1139 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1140 tcp_mss(tp, -1); 1141 } 1142 } 1143 if (flags & PRUS_EOF) { 1144 /* 1145 * Close the send side of the connection after 1146 * the data is sent. 1147 */ 1148 NET_EPOCH_ASSERT(); 1149 socantsendmore(so); 1150 tcp_usrclosed(tp); 1151 } 1152 if (!(inp->inp_flags & INP_DROPPED) && 1153 !(flags & PRUS_NOTREADY)) { 1154 if (flags & PRUS_MORETOCOME) 1155 tp->t_flags |= TF_MORETOCOME; 1156 error = tp->t_fb->tfb_tcp_output(tp); 1157 if (flags & PRUS_MORETOCOME) 1158 tp->t_flags &= ~TF_MORETOCOME; 1159 } 1160 } else { 1161 /* 1162 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1163 */ 1164 SOCKBUF_LOCK(&so->so_snd); 1165 if (sbspace(&so->so_snd) < -512) { 1166 SOCKBUF_UNLOCK(&so->so_snd); 1167 m_freem(m); 1168 error = ENOBUFS; 1169 goto out; 1170 } 1171 /* 1172 * According to RFC961 (Assigned Protocols), 1173 * the urgent pointer points to the last octet 1174 * of urgent data. We continue, however, 1175 * to consider it to indicate the first octet 1176 * of data past the urgent section. 1177 * Otherwise, snd_up should be one lower. 1178 */ 1179 sbappendstream_locked(&so->so_snd, m, flags); 1180 SOCKBUF_UNLOCK(&so->so_snd); 1181 if (nam && tp->t_state < TCPS_SYN_SENT) { 1182 /* 1183 * Do implied connect if not yet connected, 1184 * initialize window to default value, and 1185 * initialize maxseg using peer's cached MSS. 1186 */ 1187 1188 /* 1189 * Not going to contemplate SYN|URG 1190 */ 1191 if (IS_FASTOPEN(tp->t_flags)) 1192 tp->t_flags &= ~TF_FASTOPEN; 1193 #ifdef INET6 1194 if (isipv6) 1195 error = tcp6_connect(tp, nam, td); 1196 #endif /* INET6 */ 1197 #if defined(INET6) && defined(INET) 1198 else 1199 #endif 1200 #ifdef INET 1201 error = tcp_connect(tp, 1202 (struct sockaddr *)sinp, td); 1203 #endif 1204 /* 1205 * The bind operation in tcp_connect succeeded. We 1206 * no longer want to restore the flags if later 1207 * operations fail. 1208 */ 1209 if (error == 0 || inp->inp_lport != 0) 1210 restoreflags = false; 1211 1212 if (error) 1213 goto out; 1214 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1215 tcp_mss(tp, -1); 1216 } 1217 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1218 if (!(flags & PRUS_NOTREADY)) { 1219 tp->t_flags |= TF_FORCEDATA; 1220 error = tp->t_fb->tfb_tcp_output(tp); 1221 tp->t_flags &= ~TF_FORCEDATA; 1222 } 1223 } 1224 TCP_LOG_EVENT(tp, NULL, 1225 &inp->inp_socket->so_rcv, 1226 &inp->inp_socket->so_snd, 1227 TCP_LOG_USERSEND, error, 1228 0, NULL, false); 1229 out: 1230 /* 1231 * If the request was unsuccessful and we changed flags, 1232 * restore the original flags. 1233 */ 1234 if (error != 0 && restoreflags) { 1235 inp->inp_vflag = vflagsav; 1236 inp->inp_inc.inc_flags = incflagsav; 1237 } 1238 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1239 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1240 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1241 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1242 INP_WUNLOCK(inp); 1243 if (flags & PRUS_EOF) 1244 NET_EPOCH_EXIT(et); 1245 return (error); 1246 } 1247 1248 static int 1249 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1250 { 1251 struct inpcb *inp; 1252 struct tcpcb *tp; 1253 int error; 1254 1255 inp = sotoinpcb(so); 1256 INP_WLOCK(inp); 1257 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1258 INP_WUNLOCK(inp); 1259 mb_free_notready(m, count); 1260 return (ECONNRESET); 1261 } 1262 tp = intotcpcb(inp); 1263 1264 SOCKBUF_LOCK(&so->so_snd); 1265 error = sbready(&so->so_snd, m, count); 1266 SOCKBUF_UNLOCK(&so->so_snd); 1267 if (error == 0) 1268 error = tp->t_fb->tfb_tcp_output(tp); 1269 INP_WUNLOCK(inp); 1270 1271 return (error); 1272 } 1273 1274 /* 1275 * Abort the TCP. Drop the connection abruptly. 1276 */ 1277 static void 1278 tcp_usr_abort(struct socket *so) 1279 { 1280 struct inpcb *inp; 1281 struct tcpcb *tp = NULL; 1282 struct epoch_tracker et; 1283 TCPDEBUG0; 1284 1285 inp = sotoinpcb(so); 1286 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1287 1288 NET_EPOCH_ENTER(et); 1289 INP_WLOCK(inp); 1290 KASSERT(inp->inp_socket != NULL, 1291 ("tcp_usr_abort: inp_socket == NULL")); 1292 1293 /* 1294 * If we still have full TCP state, and we're not dropped, drop. 1295 */ 1296 if (!(inp->inp_flags & INP_TIMEWAIT) && 1297 !(inp->inp_flags & INP_DROPPED)) { 1298 tp = intotcpcb(inp); 1299 TCPDEBUG1(); 1300 tp = tcp_drop(tp, ECONNABORTED); 1301 if (tp == NULL) 1302 goto dropped; 1303 TCPDEBUG2(PRU_ABORT); 1304 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1305 } 1306 if (!(inp->inp_flags & INP_DROPPED)) { 1307 SOCK_LOCK(so); 1308 so->so_state |= SS_PROTOREF; 1309 SOCK_UNLOCK(so); 1310 inp->inp_flags |= INP_SOCKREF; 1311 } 1312 INP_WUNLOCK(inp); 1313 dropped: 1314 NET_EPOCH_EXIT(et); 1315 } 1316 1317 /* 1318 * TCP socket is closed. Start friendly disconnect. 1319 */ 1320 static void 1321 tcp_usr_close(struct socket *so) 1322 { 1323 struct inpcb *inp; 1324 struct tcpcb *tp = NULL; 1325 struct epoch_tracker et; 1326 TCPDEBUG0; 1327 1328 inp = sotoinpcb(so); 1329 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1330 1331 NET_EPOCH_ENTER(et); 1332 INP_WLOCK(inp); 1333 KASSERT(inp->inp_socket != NULL, 1334 ("tcp_usr_close: inp_socket == NULL")); 1335 1336 /* 1337 * If we still have full TCP state, and we're not dropped, initiate 1338 * a disconnect. 1339 */ 1340 if (!(inp->inp_flags & INP_TIMEWAIT) && 1341 !(inp->inp_flags & INP_DROPPED)) { 1342 tp = intotcpcb(inp); 1343 TCPDEBUG1(); 1344 tcp_disconnect(tp); 1345 TCPDEBUG2(PRU_CLOSE); 1346 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1347 } 1348 if (!(inp->inp_flags & INP_DROPPED)) { 1349 SOCK_LOCK(so); 1350 so->so_state |= SS_PROTOREF; 1351 SOCK_UNLOCK(so); 1352 inp->inp_flags |= INP_SOCKREF; 1353 } 1354 INP_WUNLOCK(inp); 1355 NET_EPOCH_EXIT(et); 1356 } 1357 1358 /* 1359 * Receive out-of-band data. 1360 */ 1361 static int 1362 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1363 { 1364 int error = 0; 1365 struct inpcb *inp; 1366 struct tcpcb *tp = NULL; 1367 1368 TCPDEBUG0; 1369 inp = sotoinpcb(so); 1370 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1371 INP_WLOCK(inp); 1372 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1373 error = ECONNRESET; 1374 goto out; 1375 } 1376 tp = intotcpcb(inp); 1377 TCPDEBUG1(); 1378 if ((so->so_oobmark == 0 && 1379 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1380 so->so_options & SO_OOBINLINE || 1381 tp->t_oobflags & TCPOOB_HADDATA) { 1382 error = EINVAL; 1383 goto out; 1384 } 1385 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1386 error = EWOULDBLOCK; 1387 goto out; 1388 } 1389 m->m_len = 1; 1390 *mtod(m, caddr_t) = tp->t_iobc; 1391 if ((flags & MSG_PEEK) == 0) 1392 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1393 1394 out: 1395 TCPDEBUG2(PRU_RCVOOB); 1396 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1397 INP_WUNLOCK(inp); 1398 return (error); 1399 } 1400 1401 #ifdef INET 1402 struct pr_usrreqs tcp_usrreqs = { 1403 .pru_abort = tcp_usr_abort, 1404 .pru_accept = tcp_usr_accept, 1405 .pru_attach = tcp_usr_attach, 1406 .pru_bind = tcp_usr_bind, 1407 .pru_connect = tcp_usr_connect, 1408 .pru_control = in_control, 1409 .pru_detach = tcp_usr_detach, 1410 .pru_disconnect = tcp_usr_disconnect, 1411 .pru_listen = tcp_usr_listen, 1412 .pru_peeraddr = in_getpeeraddr, 1413 .pru_rcvd = tcp_usr_rcvd, 1414 .pru_rcvoob = tcp_usr_rcvoob, 1415 .pru_send = tcp_usr_send, 1416 .pru_ready = tcp_usr_ready, 1417 .pru_shutdown = tcp_usr_shutdown, 1418 .pru_sockaddr = in_getsockaddr, 1419 .pru_sosetlabel = in_pcbsosetlabel, 1420 .pru_close = tcp_usr_close, 1421 }; 1422 #endif /* INET */ 1423 1424 #ifdef INET6 1425 struct pr_usrreqs tcp6_usrreqs = { 1426 .pru_abort = tcp_usr_abort, 1427 .pru_accept = tcp6_usr_accept, 1428 .pru_attach = tcp_usr_attach, 1429 .pru_bind = tcp6_usr_bind, 1430 .pru_connect = tcp6_usr_connect, 1431 .pru_control = in6_control, 1432 .pru_detach = tcp_usr_detach, 1433 .pru_disconnect = tcp_usr_disconnect, 1434 .pru_listen = tcp6_usr_listen, 1435 .pru_peeraddr = in6_mapped_peeraddr, 1436 .pru_rcvd = tcp_usr_rcvd, 1437 .pru_rcvoob = tcp_usr_rcvoob, 1438 .pru_send = tcp_usr_send, 1439 .pru_ready = tcp_usr_ready, 1440 .pru_shutdown = tcp_usr_shutdown, 1441 .pru_sockaddr = in6_mapped_sockaddr, 1442 .pru_sosetlabel = in_pcbsosetlabel, 1443 .pru_close = tcp_usr_close, 1444 }; 1445 #endif /* INET6 */ 1446 1447 #ifdef INET 1448 /* 1449 * Common subroutine to open a TCP connection to remote host specified 1450 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1451 * port number if needed. Call in_pcbconnect_setup to do the routing and 1452 * to choose a local host address (interface). If there is an existing 1453 * incarnation of the same connection in TIME-WAIT state and if the remote 1454 * host was sending CC options and if the connection duration was < MSL, then 1455 * truncate the previous TIME-WAIT state and proceed. 1456 * Initialize connection parameters and enter SYN-SENT state. 1457 */ 1458 static int 1459 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1460 { 1461 struct inpcb *inp = tp->t_inpcb, *oinp; 1462 struct socket *so = inp->inp_socket; 1463 struct in_addr laddr; 1464 u_short lport; 1465 int error; 1466 1467 INP_WLOCK_ASSERT(inp); 1468 INP_HASH_WLOCK(&V_tcbinfo); 1469 1470 if (inp->inp_lport == 0) { 1471 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1472 if (error) 1473 goto out; 1474 } 1475 1476 /* 1477 * Cannot simply call in_pcbconnect, because there might be an 1478 * earlier incarnation of this same connection still in 1479 * TIME_WAIT state, creating an ADDRINUSE error. 1480 */ 1481 laddr = inp->inp_laddr; 1482 lport = inp->inp_lport; 1483 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1484 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1485 if (error && oinp == NULL) 1486 goto out; 1487 if (oinp) { 1488 error = EADDRINUSE; 1489 goto out; 1490 } 1491 inp->inp_laddr = laddr; 1492 in_pcbrehash(inp); 1493 INP_HASH_WUNLOCK(&V_tcbinfo); 1494 1495 /* 1496 * Compute window scaling to request: 1497 * Scale to fit into sweet spot. See tcp_syncache.c. 1498 * XXX: This should move to tcp_output(). 1499 */ 1500 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1501 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1502 tp->request_r_scale++; 1503 1504 soisconnecting(so); 1505 TCPSTAT_INC(tcps_connattempt); 1506 tcp_state_change(tp, TCPS_SYN_SENT); 1507 tp->iss = tcp_new_isn(&inp->inp_inc); 1508 if (tp->t_flags & TF_REQ_TSTMP) 1509 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1510 tcp_sendseqinit(tp); 1511 1512 return 0; 1513 1514 out: 1515 INP_HASH_WUNLOCK(&V_tcbinfo); 1516 return (error); 1517 } 1518 #endif /* INET */ 1519 1520 #ifdef INET6 1521 static int 1522 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1523 { 1524 struct inpcb *inp = tp->t_inpcb; 1525 int error; 1526 1527 INP_WLOCK_ASSERT(inp); 1528 INP_HASH_WLOCK(&V_tcbinfo); 1529 1530 if (inp->inp_lport == 0) { 1531 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1532 if (error) 1533 goto out; 1534 } 1535 error = in6_pcbconnect(inp, nam, td->td_ucred); 1536 if (error != 0) 1537 goto out; 1538 INP_HASH_WUNLOCK(&V_tcbinfo); 1539 1540 /* Compute window scaling to request. */ 1541 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1542 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1543 tp->request_r_scale++; 1544 1545 soisconnecting(inp->inp_socket); 1546 TCPSTAT_INC(tcps_connattempt); 1547 tcp_state_change(tp, TCPS_SYN_SENT); 1548 tp->iss = tcp_new_isn(&inp->inp_inc); 1549 if (tp->t_flags & TF_REQ_TSTMP) 1550 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1551 tcp_sendseqinit(tp); 1552 1553 return 0; 1554 1555 out: 1556 INP_HASH_WUNLOCK(&V_tcbinfo); 1557 return error; 1558 } 1559 #endif /* INET6 */ 1560 1561 /* 1562 * Export TCP internal state information via a struct tcp_info, based on the 1563 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1564 * (TCP state machine, etc). We export all information using FreeBSD-native 1565 * constants -- for example, the numeric values for tcpi_state will differ 1566 * from Linux. 1567 */ 1568 static void 1569 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1570 { 1571 1572 INP_WLOCK_ASSERT(tp->t_inpcb); 1573 bzero(ti, sizeof(*ti)); 1574 1575 ti->tcpi_state = tp->t_state; 1576 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1577 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1578 if (tp->t_flags & TF_SACK_PERMIT) 1579 ti->tcpi_options |= TCPI_OPT_SACK; 1580 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1581 ti->tcpi_options |= TCPI_OPT_WSCALE; 1582 ti->tcpi_snd_wscale = tp->snd_scale; 1583 ti->tcpi_rcv_wscale = tp->rcv_scale; 1584 } 1585 if (tp->t_flags2 & TF2_ECN_PERMIT) 1586 ti->tcpi_options |= TCPI_OPT_ECN; 1587 1588 ti->tcpi_rto = tp->t_rxtcur * tick; 1589 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1590 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1591 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1592 1593 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1594 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1595 1596 /* 1597 * FreeBSD-specific extension fields for tcp_info. 1598 */ 1599 ti->tcpi_rcv_space = tp->rcv_wnd; 1600 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1601 ti->tcpi_snd_wnd = tp->snd_wnd; 1602 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1603 ti->tcpi_snd_nxt = tp->snd_nxt; 1604 ti->tcpi_snd_mss = tp->t_maxseg; 1605 ti->tcpi_rcv_mss = tp->t_maxseg; 1606 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1607 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1608 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1609 #ifdef TCP_OFFLOAD 1610 if (tp->t_flags & TF_TOE) { 1611 ti->tcpi_options |= TCPI_OPT_TOE; 1612 tcp_offload_tcp_info(tp, ti); 1613 } 1614 #endif 1615 } 1616 1617 /* 1618 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1619 * socket option arguments. When it re-acquires the lock after the copy, it 1620 * has to revalidate that the connection is still valid for the socket 1621 * option. 1622 */ 1623 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1624 INP_WLOCK(inp); \ 1625 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1626 INP_WUNLOCK(inp); \ 1627 cleanup; \ 1628 return (ECONNRESET); \ 1629 } \ 1630 tp = intotcpcb(inp); \ 1631 } while(0) 1632 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1633 1634 int 1635 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1636 { 1637 int error; 1638 struct inpcb *inp; 1639 struct tcpcb *tp; 1640 struct tcp_function_block *blk; 1641 struct tcp_function_set fsn; 1642 1643 error = 0; 1644 inp = sotoinpcb(so); 1645 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1646 if (sopt->sopt_level != IPPROTO_TCP) { 1647 #ifdef INET6 1648 if (inp->inp_vflag & INP_IPV6PROTO) { 1649 error = ip6_ctloutput(so, sopt); 1650 /* 1651 * In case of the IPV6_USE_MIN_MTU socket option, 1652 * the INC_IPV6MINMTU flag to announce a corresponding 1653 * MSS during the initial handshake. 1654 * If the TCP connection is not in the front states, 1655 * just reduce the MSS being used. 1656 * This avoids the sending of TCP segments which will 1657 * be fragmented at the IPv6 layer. 1658 */ 1659 if ((error == 0) && 1660 (sopt->sopt_dir == SOPT_SET) && 1661 (sopt->sopt_level == IPPROTO_IPV6) && 1662 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1663 INP_WLOCK(inp); 1664 if ((inp->inp_flags & 1665 (INP_TIMEWAIT | INP_DROPPED))) { 1666 INP_WUNLOCK(inp); 1667 return (ECONNRESET); 1668 } 1669 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1670 tp = intotcpcb(inp); 1671 if ((tp->t_state >= TCPS_SYN_SENT) && 1672 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1673 struct ip6_pktopts *opt; 1674 1675 opt = inp->in6p_outputopts; 1676 if ((opt != NULL) && 1677 (opt->ip6po_minmtu == 1678 IP6PO_MINMTU_ALL)) { 1679 if (tp->t_maxseg > TCP6_MSS) { 1680 tp->t_maxseg = TCP6_MSS; 1681 } 1682 } 1683 } 1684 INP_WUNLOCK(inp); 1685 } 1686 } 1687 #endif /* INET6 */ 1688 #if defined(INET6) && defined(INET) 1689 else 1690 #endif 1691 #ifdef INET 1692 { 1693 error = ip_ctloutput(so, sopt); 1694 } 1695 #endif 1696 return (error); 1697 } 1698 INP_WLOCK(inp); 1699 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1700 INP_WUNLOCK(inp); 1701 return (ECONNRESET); 1702 } 1703 tp = intotcpcb(inp); 1704 /* 1705 * Protect the TCP option TCP_FUNCTION_BLK so 1706 * that a sub-function can *never* overwrite this. 1707 */ 1708 if ((sopt->sopt_dir == SOPT_SET) && 1709 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1710 INP_WUNLOCK(inp); 1711 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1712 sizeof fsn); 1713 if (error) 1714 return (error); 1715 INP_WLOCK_RECHECK(inp); 1716 blk = find_and_ref_tcp_functions(&fsn); 1717 if (blk == NULL) { 1718 INP_WUNLOCK(inp); 1719 return (ENOENT); 1720 } 1721 if (tp->t_fb == blk) { 1722 /* You already have this */ 1723 refcount_release(&blk->tfb_refcnt); 1724 INP_WUNLOCK(inp); 1725 return (0); 1726 } 1727 if (tp->t_state != TCPS_CLOSED) { 1728 /* 1729 * The user has advanced the state 1730 * past the initial point, we may not 1731 * be able to switch. 1732 */ 1733 if (blk->tfb_tcp_handoff_ok != NULL) { 1734 /* 1735 * Does the stack provide a 1736 * query mechanism, if so it may 1737 * still be possible? 1738 */ 1739 error = (*blk->tfb_tcp_handoff_ok)(tp); 1740 } else 1741 error = EINVAL; 1742 if (error) { 1743 refcount_release(&blk->tfb_refcnt); 1744 INP_WUNLOCK(inp); 1745 return(error); 1746 } 1747 } 1748 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1749 refcount_release(&blk->tfb_refcnt); 1750 INP_WUNLOCK(inp); 1751 return (ENOENT); 1752 } 1753 /* 1754 * Release the old refcnt, the 1755 * lookup acquired a ref on the 1756 * new one already. 1757 */ 1758 if (tp->t_fb->tfb_tcp_fb_fini) { 1759 /* 1760 * Tell the stack to cleanup with 0 i.e. 1761 * the tcb is not going away. 1762 */ 1763 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1764 } 1765 #ifdef TCPHPTS 1766 /* Assure that we are not on any hpts */ 1767 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1768 #endif 1769 if (blk->tfb_tcp_fb_init) { 1770 error = (*blk->tfb_tcp_fb_init)(tp); 1771 if (error) { 1772 refcount_release(&blk->tfb_refcnt); 1773 if (tp->t_fb->tfb_tcp_fb_init) { 1774 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1775 /* Fall back failed, drop the connection */ 1776 INP_WUNLOCK(inp); 1777 soabort(so); 1778 return(error); 1779 } 1780 } 1781 goto err_out; 1782 } 1783 } 1784 refcount_release(&tp->t_fb->tfb_refcnt); 1785 tp->t_fb = blk; 1786 #ifdef TCP_OFFLOAD 1787 if (tp->t_flags & TF_TOE) { 1788 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1789 sopt->sopt_name); 1790 } 1791 #endif 1792 err_out: 1793 INP_WUNLOCK(inp); 1794 return (error); 1795 } else if ((sopt->sopt_dir == SOPT_GET) && 1796 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1797 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1798 TCP_FUNCTION_NAME_LEN_MAX); 1799 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1800 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1801 INP_WUNLOCK(inp); 1802 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1803 return (error); 1804 } 1805 /* Pass in the INP locked, called must unlock it */ 1806 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1807 } 1808 1809 /* 1810 * If this assert becomes untrue, we need to change the size of the buf 1811 * variable in tcp_default_ctloutput(). 1812 */ 1813 #ifdef CTASSERT 1814 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1815 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1816 #endif 1817 1818 int 1819 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1820 { 1821 int error, opt, optval; 1822 u_int ui; 1823 struct tcp_info ti; 1824 #ifdef KERN_TLS 1825 struct tls_enable tls; 1826 #endif 1827 struct cc_algo *algo; 1828 char *pbuf, buf[TCP_LOG_ID_LEN]; 1829 #ifdef STATS 1830 struct statsblob *sbp; 1831 #endif 1832 size_t len; 1833 1834 /* 1835 * For TCP_CCALGOOPT forward the control to CC module, for both 1836 * SOPT_SET and SOPT_GET. 1837 */ 1838 switch (sopt->sopt_name) { 1839 case TCP_CCALGOOPT: 1840 INP_WUNLOCK(inp); 1841 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 1842 return (EINVAL); 1843 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1844 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1845 sopt->sopt_valsize); 1846 if (error) { 1847 free(pbuf, M_TEMP); 1848 return (error); 1849 } 1850 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1851 if (CC_ALGO(tp)->ctl_output != NULL) 1852 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1853 else 1854 error = ENOENT; 1855 INP_WUNLOCK(inp); 1856 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1857 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1858 free(pbuf, M_TEMP); 1859 return (error); 1860 } 1861 1862 switch (sopt->sopt_dir) { 1863 case SOPT_SET: 1864 switch (sopt->sopt_name) { 1865 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1866 case TCP_MD5SIG: 1867 if (!TCPMD5_ENABLED()) { 1868 INP_WUNLOCK(inp); 1869 return (ENOPROTOOPT); 1870 } 1871 error = TCPMD5_PCBCTL(inp, sopt); 1872 if (error) 1873 return (error); 1874 goto unlock_and_done; 1875 #endif /* IPSEC */ 1876 1877 case TCP_NODELAY: 1878 case TCP_NOOPT: 1879 INP_WUNLOCK(inp); 1880 error = sooptcopyin(sopt, &optval, sizeof optval, 1881 sizeof optval); 1882 if (error) 1883 return (error); 1884 1885 INP_WLOCK_RECHECK(inp); 1886 switch (sopt->sopt_name) { 1887 case TCP_NODELAY: 1888 opt = TF_NODELAY; 1889 break; 1890 case TCP_NOOPT: 1891 opt = TF_NOOPT; 1892 break; 1893 default: 1894 opt = 0; /* dead code to fool gcc */ 1895 break; 1896 } 1897 1898 if (optval) 1899 tp->t_flags |= opt; 1900 else 1901 tp->t_flags &= ~opt; 1902 unlock_and_done: 1903 #ifdef TCP_OFFLOAD 1904 if (tp->t_flags & TF_TOE) { 1905 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1906 sopt->sopt_name); 1907 } 1908 #endif 1909 INP_WUNLOCK(inp); 1910 break; 1911 1912 case TCP_NOPUSH: 1913 INP_WUNLOCK(inp); 1914 error = sooptcopyin(sopt, &optval, sizeof optval, 1915 sizeof optval); 1916 if (error) 1917 return (error); 1918 1919 INP_WLOCK_RECHECK(inp); 1920 if (optval) 1921 tp->t_flags |= TF_NOPUSH; 1922 else if (tp->t_flags & TF_NOPUSH) { 1923 tp->t_flags &= ~TF_NOPUSH; 1924 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1925 error = tp->t_fb->tfb_tcp_output(tp); 1926 } 1927 goto unlock_and_done; 1928 1929 case TCP_MAXSEG: 1930 INP_WUNLOCK(inp); 1931 error = sooptcopyin(sopt, &optval, sizeof optval, 1932 sizeof optval); 1933 if (error) 1934 return (error); 1935 1936 INP_WLOCK_RECHECK(inp); 1937 if (optval > 0 && optval <= tp->t_maxseg && 1938 optval + 40 >= V_tcp_minmss) 1939 tp->t_maxseg = optval; 1940 else 1941 error = EINVAL; 1942 goto unlock_and_done; 1943 1944 case TCP_INFO: 1945 INP_WUNLOCK(inp); 1946 error = EINVAL; 1947 break; 1948 1949 case TCP_STATS: 1950 INP_WUNLOCK(inp); 1951 #ifdef STATS 1952 error = sooptcopyin(sopt, &optval, sizeof optval, 1953 sizeof optval); 1954 if (error) 1955 return (error); 1956 1957 if (optval > 0) 1958 sbp = stats_blob_alloc( 1959 V_tcp_perconn_stats_dflt_tpl, 0); 1960 else 1961 sbp = NULL; 1962 1963 INP_WLOCK_RECHECK(inp); 1964 if ((tp->t_stats != NULL && sbp == NULL) || 1965 (tp->t_stats == NULL && sbp != NULL)) { 1966 struct statsblob *t = tp->t_stats; 1967 tp->t_stats = sbp; 1968 sbp = t; 1969 } 1970 INP_WUNLOCK(inp); 1971 1972 stats_blob_destroy(sbp); 1973 #else 1974 return (EOPNOTSUPP); 1975 #endif /* !STATS */ 1976 break; 1977 1978 case TCP_CONGESTION: 1979 INP_WUNLOCK(inp); 1980 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1981 if (error) 1982 break; 1983 buf[sopt->sopt_valsize] = '\0'; 1984 INP_WLOCK_RECHECK(inp); 1985 CC_LIST_RLOCK(); 1986 STAILQ_FOREACH(algo, &cc_list, entries) 1987 if (strncmp(buf, algo->name, 1988 TCP_CA_NAME_MAX) == 0) 1989 break; 1990 CC_LIST_RUNLOCK(); 1991 if (algo == NULL) { 1992 INP_WUNLOCK(inp); 1993 error = EINVAL; 1994 break; 1995 } 1996 /* 1997 * We hold a write lock over the tcb so it's safe to 1998 * do these things without ordering concerns. 1999 */ 2000 if (CC_ALGO(tp)->cb_destroy != NULL) 2001 CC_ALGO(tp)->cb_destroy(tp->ccv); 2002 CC_DATA(tp) = NULL; 2003 CC_ALGO(tp) = algo; 2004 /* 2005 * If something goes pear shaped initialising the new 2006 * algo, fall back to newreno (which does not 2007 * require initialisation). 2008 */ 2009 if (algo->cb_init != NULL && 2010 algo->cb_init(tp->ccv) != 0) { 2011 CC_ALGO(tp) = &newreno_cc_algo; 2012 /* 2013 * The only reason init should fail is 2014 * because of malloc. 2015 */ 2016 error = ENOMEM; 2017 } 2018 INP_WUNLOCK(inp); 2019 break; 2020 2021 #ifdef KERN_TLS 2022 case TCP_TXTLS_ENABLE: 2023 INP_WUNLOCK(inp); 2024 error = sooptcopyin(sopt, &tls, sizeof(tls), 2025 sizeof(tls)); 2026 if (error) 2027 break; 2028 error = ktls_enable_tx(so, &tls); 2029 break; 2030 case TCP_TXTLS_MODE: 2031 INP_WUNLOCK(inp); 2032 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2033 if (error) 2034 return (error); 2035 2036 INP_WLOCK_RECHECK(inp); 2037 error = ktls_set_tx_mode(so, ui); 2038 INP_WUNLOCK(inp); 2039 break; 2040 #endif 2041 2042 case TCP_KEEPIDLE: 2043 case TCP_KEEPINTVL: 2044 case TCP_KEEPINIT: 2045 INP_WUNLOCK(inp); 2046 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2047 if (error) 2048 return (error); 2049 2050 if (ui > (UINT_MAX / hz)) { 2051 error = EINVAL; 2052 break; 2053 } 2054 ui *= hz; 2055 2056 INP_WLOCK_RECHECK(inp); 2057 switch (sopt->sopt_name) { 2058 case TCP_KEEPIDLE: 2059 tp->t_keepidle = ui; 2060 /* 2061 * XXX: better check current remaining 2062 * timeout and "merge" it with new value. 2063 */ 2064 if ((tp->t_state > TCPS_LISTEN) && 2065 (tp->t_state <= TCPS_CLOSING)) 2066 tcp_timer_activate(tp, TT_KEEP, 2067 TP_KEEPIDLE(tp)); 2068 break; 2069 case TCP_KEEPINTVL: 2070 tp->t_keepintvl = ui; 2071 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2072 (TP_MAXIDLE(tp) > 0)) 2073 tcp_timer_activate(tp, TT_2MSL, 2074 TP_MAXIDLE(tp)); 2075 break; 2076 case TCP_KEEPINIT: 2077 tp->t_keepinit = ui; 2078 if (tp->t_state == TCPS_SYN_RECEIVED || 2079 tp->t_state == TCPS_SYN_SENT) 2080 tcp_timer_activate(tp, TT_KEEP, 2081 TP_KEEPINIT(tp)); 2082 break; 2083 } 2084 goto unlock_and_done; 2085 2086 case TCP_KEEPCNT: 2087 INP_WUNLOCK(inp); 2088 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2089 if (error) 2090 return (error); 2091 2092 INP_WLOCK_RECHECK(inp); 2093 tp->t_keepcnt = ui; 2094 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2095 (TP_MAXIDLE(tp) > 0)) 2096 tcp_timer_activate(tp, TT_2MSL, 2097 TP_MAXIDLE(tp)); 2098 goto unlock_and_done; 2099 2100 #ifdef TCPPCAP 2101 case TCP_PCAP_OUT: 2102 case TCP_PCAP_IN: 2103 INP_WUNLOCK(inp); 2104 error = sooptcopyin(sopt, &optval, sizeof optval, 2105 sizeof optval); 2106 if (error) 2107 return (error); 2108 2109 INP_WLOCK_RECHECK(inp); 2110 if (optval >= 0) 2111 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 2112 &(tp->t_outpkts) : &(tp->t_inpkts), 2113 optval); 2114 else 2115 error = EINVAL; 2116 goto unlock_and_done; 2117 #endif 2118 2119 case TCP_FASTOPEN: { 2120 struct tcp_fastopen tfo_optval; 2121 2122 INP_WUNLOCK(inp); 2123 if (!V_tcp_fastopen_client_enable && 2124 !V_tcp_fastopen_server_enable) 2125 return (EPERM); 2126 2127 error = sooptcopyin(sopt, &tfo_optval, 2128 sizeof(tfo_optval), sizeof(int)); 2129 if (error) 2130 return (error); 2131 2132 INP_WLOCK_RECHECK(inp); 2133 if (tfo_optval.enable) { 2134 if (tp->t_state == TCPS_LISTEN) { 2135 if (!V_tcp_fastopen_server_enable) { 2136 error = EPERM; 2137 goto unlock_and_done; 2138 } 2139 2140 tp->t_flags |= TF_FASTOPEN; 2141 if (tp->t_tfo_pending == NULL) 2142 tp->t_tfo_pending = 2143 tcp_fastopen_alloc_counter(); 2144 } else { 2145 /* 2146 * If a pre-shared key was provided, 2147 * stash it in the client cookie 2148 * field of the tcpcb for use during 2149 * connect. 2150 */ 2151 if (sopt->sopt_valsize == 2152 sizeof(tfo_optval)) { 2153 memcpy(tp->t_tfo_cookie.client, 2154 tfo_optval.psk, 2155 TCP_FASTOPEN_PSK_LEN); 2156 tp->t_tfo_client_cookie_len = 2157 TCP_FASTOPEN_PSK_LEN; 2158 } 2159 tp->t_flags |= TF_FASTOPEN; 2160 } 2161 } else 2162 tp->t_flags &= ~TF_FASTOPEN; 2163 goto unlock_and_done; 2164 } 2165 2166 #ifdef TCP_BLACKBOX 2167 case TCP_LOG: 2168 INP_WUNLOCK(inp); 2169 error = sooptcopyin(sopt, &optval, sizeof optval, 2170 sizeof optval); 2171 if (error) 2172 return (error); 2173 2174 INP_WLOCK_RECHECK(inp); 2175 error = tcp_log_state_change(tp, optval); 2176 goto unlock_and_done; 2177 2178 case TCP_LOGBUF: 2179 INP_WUNLOCK(inp); 2180 error = EINVAL; 2181 break; 2182 2183 case TCP_LOGID: 2184 INP_WUNLOCK(inp); 2185 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2186 if (error) 2187 break; 2188 buf[sopt->sopt_valsize] = '\0'; 2189 INP_WLOCK_RECHECK(inp); 2190 error = tcp_log_set_id(tp, buf); 2191 /* tcp_log_set_id() unlocks the INP. */ 2192 break; 2193 2194 case TCP_LOGDUMP: 2195 case TCP_LOGDUMPID: 2196 INP_WUNLOCK(inp); 2197 error = 2198 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2199 if (error) 2200 break; 2201 buf[sopt->sopt_valsize] = '\0'; 2202 INP_WLOCK_RECHECK(inp); 2203 if (sopt->sopt_name == TCP_LOGDUMP) { 2204 error = tcp_log_dump_tp_logbuf(tp, buf, 2205 M_WAITOK, true); 2206 INP_WUNLOCK(inp); 2207 } else { 2208 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2209 /* 2210 * tcp_log_dump_tp_bucket_logbufs() drops the 2211 * INP lock. 2212 */ 2213 } 2214 break; 2215 #endif 2216 2217 default: 2218 INP_WUNLOCK(inp); 2219 error = ENOPROTOOPT; 2220 break; 2221 } 2222 break; 2223 2224 case SOPT_GET: 2225 tp = intotcpcb(inp); 2226 switch (sopt->sopt_name) { 2227 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2228 case TCP_MD5SIG: 2229 if (!TCPMD5_ENABLED()) { 2230 INP_WUNLOCK(inp); 2231 return (ENOPROTOOPT); 2232 } 2233 error = TCPMD5_PCBCTL(inp, sopt); 2234 break; 2235 #endif 2236 2237 case TCP_NODELAY: 2238 optval = tp->t_flags & TF_NODELAY; 2239 INP_WUNLOCK(inp); 2240 error = sooptcopyout(sopt, &optval, sizeof optval); 2241 break; 2242 case TCP_MAXSEG: 2243 optval = tp->t_maxseg; 2244 INP_WUNLOCK(inp); 2245 error = sooptcopyout(sopt, &optval, sizeof optval); 2246 break; 2247 case TCP_NOOPT: 2248 optval = tp->t_flags & TF_NOOPT; 2249 INP_WUNLOCK(inp); 2250 error = sooptcopyout(sopt, &optval, sizeof optval); 2251 break; 2252 case TCP_NOPUSH: 2253 optval = tp->t_flags & TF_NOPUSH; 2254 INP_WUNLOCK(inp); 2255 error = sooptcopyout(sopt, &optval, sizeof optval); 2256 break; 2257 case TCP_INFO: 2258 tcp_fill_info(tp, &ti); 2259 INP_WUNLOCK(inp); 2260 error = sooptcopyout(sopt, &ti, sizeof ti); 2261 break; 2262 case TCP_STATS: 2263 { 2264 #ifdef STATS 2265 int nheld; 2266 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2267 2268 error = 0; 2269 socklen_t outsbsz = sopt->sopt_valsize; 2270 if (tp->t_stats == NULL) 2271 error = ENOENT; 2272 else if (outsbsz >= tp->t_stats->cursz) 2273 outsbsz = tp->t_stats->cursz; 2274 else if (outsbsz >= sizeof(struct statsblob)) 2275 outsbsz = sizeof(struct statsblob); 2276 else 2277 error = EINVAL; 2278 INP_WUNLOCK(inp); 2279 if (error) 2280 break; 2281 2282 sbp = sopt->sopt_val; 2283 nheld = atop(round_page(((vm_offset_t)sbp) + 2284 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2285 vm_page_t ma[nheld]; 2286 if (vm_fault_quick_hold_pages( 2287 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2288 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2289 nheld) < 0) { 2290 error = EFAULT; 2291 break; 2292 } 2293 2294 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2295 SIZEOF_MEMBER(struct statsblob, flags)))) 2296 goto unhold; 2297 2298 INP_WLOCK_RECHECK(inp); 2299 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2300 sbflags | SB_CLONE_USRDSTNOFAULT); 2301 INP_WUNLOCK(inp); 2302 sopt->sopt_valsize = outsbsz; 2303 unhold: 2304 vm_page_unhold_pages(ma, nheld); 2305 #else 2306 INP_WUNLOCK(inp); 2307 error = EOPNOTSUPP; 2308 #endif /* !STATS */ 2309 break; 2310 } 2311 case TCP_CONGESTION: 2312 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2313 INP_WUNLOCK(inp); 2314 error = sooptcopyout(sopt, buf, len + 1); 2315 break; 2316 case TCP_KEEPIDLE: 2317 case TCP_KEEPINTVL: 2318 case TCP_KEEPINIT: 2319 case TCP_KEEPCNT: 2320 switch (sopt->sopt_name) { 2321 case TCP_KEEPIDLE: 2322 ui = TP_KEEPIDLE(tp) / hz; 2323 break; 2324 case TCP_KEEPINTVL: 2325 ui = TP_KEEPINTVL(tp) / hz; 2326 break; 2327 case TCP_KEEPINIT: 2328 ui = TP_KEEPINIT(tp) / hz; 2329 break; 2330 case TCP_KEEPCNT: 2331 ui = TP_KEEPCNT(tp); 2332 break; 2333 } 2334 INP_WUNLOCK(inp); 2335 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2336 break; 2337 #ifdef TCPPCAP 2338 case TCP_PCAP_OUT: 2339 case TCP_PCAP_IN: 2340 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2341 &(tp->t_outpkts) : &(tp->t_inpkts)); 2342 INP_WUNLOCK(inp); 2343 error = sooptcopyout(sopt, &optval, sizeof optval); 2344 break; 2345 #endif 2346 case TCP_FASTOPEN: 2347 optval = tp->t_flags & TF_FASTOPEN; 2348 INP_WUNLOCK(inp); 2349 error = sooptcopyout(sopt, &optval, sizeof optval); 2350 break; 2351 #ifdef TCP_BLACKBOX 2352 case TCP_LOG: 2353 optval = tp->t_logstate; 2354 INP_WUNLOCK(inp); 2355 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2356 break; 2357 case TCP_LOGBUF: 2358 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2359 error = tcp_log_getlogbuf(sopt, tp); 2360 break; 2361 case TCP_LOGID: 2362 len = tcp_log_get_id(tp, buf); 2363 INP_WUNLOCK(inp); 2364 error = sooptcopyout(sopt, buf, len + 1); 2365 break; 2366 case TCP_LOGDUMP: 2367 case TCP_LOGDUMPID: 2368 INP_WUNLOCK(inp); 2369 error = EINVAL; 2370 break; 2371 #endif 2372 #ifdef KERN_TLS 2373 case TCP_TXTLS_MODE: 2374 optval = ktls_get_tx_mode(so); 2375 INP_WUNLOCK(inp); 2376 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2377 break; 2378 #endif 2379 default: 2380 INP_WUNLOCK(inp); 2381 error = ENOPROTOOPT; 2382 break; 2383 } 2384 break; 2385 } 2386 return (error); 2387 } 2388 #undef INP_WLOCK_RECHECK 2389 #undef INP_WLOCK_RECHECK_CLEANUP 2390 2391 /* 2392 * Attach TCP protocol to socket, allocating 2393 * internet protocol control block, tcp control block, 2394 * bufer space, and entering LISTEN state if to accept connections. 2395 */ 2396 static int 2397 tcp_attach(struct socket *so) 2398 { 2399 struct tcpcb *tp; 2400 struct inpcb *inp; 2401 struct epoch_tracker et; 2402 int error; 2403 2404 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 2405 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 2406 if (error) 2407 return (error); 2408 } 2409 so->so_rcv.sb_flags |= SB_AUTOSIZE; 2410 so->so_snd.sb_flags |= SB_AUTOSIZE; 2411 NET_EPOCH_ENTER(et); 2412 error = in_pcballoc(so, &V_tcbinfo); 2413 if (error) { 2414 NET_EPOCH_EXIT(et); 2415 return (error); 2416 } 2417 inp = sotoinpcb(so); 2418 #ifdef INET6 2419 if (inp->inp_vflag & INP_IPV6PROTO) { 2420 inp->inp_vflag |= INP_IPV6; 2421 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 2422 inp->inp_vflag |= INP_IPV4; 2423 inp->in6p_hops = -1; /* use kernel default */ 2424 } 2425 else 2426 #endif 2427 inp->inp_vflag |= INP_IPV4; 2428 tp = tcp_newtcpcb(inp); 2429 if (tp == NULL) { 2430 in_pcbdetach(inp); 2431 in_pcbfree(inp); 2432 NET_EPOCH_EXIT(et); 2433 return (ENOBUFS); 2434 } 2435 tp->t_state = TCPS_CLOSED; 2436 INP_WUNLOCK(inp); 2437 NET_EPOCH_EXIT(et); 2438 TCPSTATES_INC(TCPS_CLOSED); 2439 return (0); 2440 } 2441 2442 /* 2443 * Initiate (or continue) disconnect. 2444 * If embryonic state, just send reset (once). 2445 * If in ``let data drain'' option and linger null, just drop. 2446 * Otherwise (hard), mark socket disconnecting and drop 2447 * current input data; switch states based on user close, and 2448 * send segment to peer (with FIN). 2449 */ 2450 static void 2451 tcp_disconnect(struct tcpcb *tp) 2452 { 2453 struct inpcb *inp = tp->t_inpcb; 2454 struct socket *so = inp->inp_socket; 2455 2456 NET_EPOCH_ASSERT(); 2457 INP_WLOCK_ASSERT(inp); 2458 2459 /* 2460 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2461 * socket is still open. 2462 */ 2463 if (tp->t_state < TCPS_ESTABLISHED && 2464 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2465 tp = tcp_close(tp); 2466 KASSERT(tp != NULL, 2467 ("tcp_disconnect: tcp_close() returned NULL")); 2468 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2469 tp = tcp_drop(tp, 0); 2470 KASSERT(tp != NULL, 2471 ("tcp_disconnect: tcp_drop() returned NULL")); 2472 } else { 2473 soisdisconnecting(so); 2474 sbflush(&so->so_rcv); 2475 tcp_usrclosed(tp); 2476 if (!(inp->inp_flags & INP_DROPPED)) 2477 tp->t_fb->tfb_tcp_output(tp); 2478 } 2479 } 2480 2481 /* 2482 * User issued close, and wish to trail through shutdown states: 2483 * if never received SYN, just forget it. If got a SYN from peer, 2484 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2485 * If already got a FIN from peer, then almost done; go to LAST_ACK 2486 * state. In all other cases, have already sent FIN to peer (e.g. 2487 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2488 * for peer to send FIN or not respond to keep-alives, etc. 2489 * We can let the user exit from the close as soon as the FIN is acked. 2490 */ 2491 static void 2492 tcp_usrclosed(struct tcpcb *tp) 2493 { 2494 2495 NET_EPOCH_ASSERT(); 2496 INP_WLOCK_ASSERT(tp->t_inpcb); 2497 2498 switch (tp->t_state) { 2499 case TCPS_LISTEN: 2500 #ifdef TCP_OFFLOAD 2501 tcp_offload_listen_stop(tp); 2502 #endif 2503 tcp_state_change(tp, TCPS_CLOSED); 2504 /* FALLTHROUGH */ 2505 case TCPS_CLOSED: 2506 tp = tcp_close(tp); 2507 /* 2508 * tcp_close() should never return NULL here as the socket is 2509 * still open. 2510 */ 2511 KASSERT(tp != NULL, 2512 ("tcp_usrclosed: tcp_close() returned NULL")); 2513 break; 2514 2515 case TCPS_SYN_SENT: 2516 case TCPS_SYN_RECEIVED: 2517 tp->t_flags |= TF_NEEDFIN; 2518 break; 2519 2520 case TCPS_ESTABLISHED: 2521 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2522 break; 2523 2524 case TCPS_CLOSE_WAIT: 2525 tcp_state_change(tp, TCPS_LAST_ACK); 2526 break; 2527 } 2528 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2529 soisdisconnected(tp->t_inpcb->inp_socket); 2530 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2531 if (tp->t_state == TCPS_FIN_WAIT_2) { 2532 int timeout; 2533 2534 timeout = (tcp_fast_finwait2_recycle) ? 2535 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2536 tcp_timer_activate(tp, TT_2MSL, timeout); 2537 } 2538 } 2539 } 2540 2541 #ifdef DDB 2542 static void 2543 db_print_indent(int indent) 2544 { 2545 int i; 2546 2547 for (i = 0; i < indent; i++) 2548 db_printf(" "); 2549 } 2550 2551 static void 2552 db_print_tstate(int t_state) 2553 { 2554 2555 switch (t_state) { 2556 case TCPS_CLOSED: 2557 db_printf("TCPS_CLOSED"); 2558 return; 2559 2560 case TCPS_LISTEN: 2561 db_printf("TCPS_LISTEN"); 2562 return; 2563 2564 case TCPS_SYN_SENT: 2565 db_printf("TCPS_SYN_SENT"); 2566 return; 2567 2568 case TCPS_SYN_RECEIVED: 2569 db_printf("TCPS_SYN_RECEIVED"); 2570 return; 2571 2572 case TCPS_ESTABLISHED: 2573 db_printf("TCPS_ESTABLISHED"); 2574 return; 2575 2576 case TCPS_CLOSE_WAIT: 2577 db_printf("TCPS_CLOSE_WAIT"); 2578 return; 2579 2580 case TCPS_FIN_WAIT_1: 2581 db_printf("TCPS_FIN_WAIT_1"); 2582 return; 2583 2584 case TCPS_CLOSING: 2585 db_printf("TCPS_CLOSING"); 2586 return; 2587 2588 case TCPS_LAST_ACK: 2589 db_printf("TCPS_LAST_ACK"); 2590 return; 2591 2592 case TCPS_FIN_WAIT_2: 2593 db_printf("TCPS_FIN_WAIT_2"); 2594 return; 2595 2596 case TCPS_TIME_WAIT: 2597 db_printf("TCPS_TIME_WAIT"); 2598 return; 2599 2600 default: 2601 db_printf("unknown"); 2602 return; 2603 } 2604 } 2605 2606 static void 2607 db_print_tflags(u_int t_flags) 2608 { 2609 int comma; 2610 2611 comma = 0; 2612 if (t_flags & TF_ACKNOW) { 2613 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2614 comma = 1; 2615 } 2616 if (t_flags & TF_DELACK) { 2617 db_printf("%sTF_DELACK", comma ? ", " : ""); 2618 comma = 1; 2619 } 2620 if (t_flags & TF_NODELAY) { 2621 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2622 comma = 1; 2623 } 2624 if (t_flags & TF_NOOPT) { 2625 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2626 comma = 1; 2627 } 2628 if (t_flags & TF_SENTFIN) { 2629 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2630 comma = 1; 2631 } 2632 if (t_flags & TF_REQ_SCALE) { 2633 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2634 comma = 1; 2635 } 2636 if (t_flags & TF_RCVD_SCALE) { 2637 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2638 comma = 1; 2639 } 2640 if (t_flags & TF_REQ_TSTMP) { 2641 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2642 comma = 1; 2643 } 2644 if (t_flags & TF_RCVD_TSTMP) { 2645 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2646 comma = 1; 2647 } 2648 if (t_flags & TF_SACK_PERMIT) { 2649 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2650 comma = 1; 2651 } 2652 if (t_flags & TF_NEEDSYN) { 2653 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2654 comma = 1; 2655 } 2656 if (t_flags & TF_NEEDFIN) { 2657 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2658 comma = 1; 2659 } 2660 if (t_flags & TF_NOPUSH) { 2661 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2662 comma = 1; 2663 } 2664 if (t_flags & TF_MORETOCOME) { 2665 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2666 comma = 1; 2667 } 2668 if (t_flags & TF_LQ_OVERFLOW) { 2669 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2670 comma = 1; 2671 } 2672 if (t_flags & TF_LASTIDLE) { 2673 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2674 comma = 1; 2675 } 2676 if (t_flags & TF_RXWIN0SENT) { 2677 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2678 comma = 1; 2679 } 2680 if (t_flags & TF_FASTRECOVERY) { 2681 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2682 comma = 1; 2683 } 2684 if (t_flags & TF_CONGRECOVERY) { 2685 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2686 comma = 1; 2687 } 2688 if (t_flags & TF_WASFRECOVERY) { 2689 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2690 comma = 1; 2691 } 2692 if (t_flags & TF_SIGNATURE) { 2693 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2694 comma = 1; 2695 } 2696 if (t_flags & TF_FORCEDATA) { 2697 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2698 comma = 1; 2699 } 2700 if (t_flags & TF_TSO) { 2701 db_printf("%sTF_TSO", comma ? ", " : ""); 2702 comma = 1; 2703 } 2704 if (t_flags & TF_FASTOPEN) { 2705 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2706 comma = 1; 2707 } 2708 } 2709 2710 static void 2711 db_print_tflags2(u_int t_flags2) 2712 { 2713 int comma; 2714 2715 comma = 0; 2716 if (t_flags2 & TF2_ECN_PERMIT) { 2717 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : ""); 2718 comma = 1; 2719 } 2720 } 2721 2722 2723 static void 2724 db_print_toobflags(char t_oobflags) 2725 { 2726 int comma; 2727 2728 comma = 0; 2729 if (t_oobflags & TCPOOB_HAVEDATA) { 2730 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2731 comma = 1; 2732 } 2733 if (t_oobflags & TCPOOB_HADDATA) { 2734 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2735 comma = 1; 2736 } 2737 } 2738 2739 static void 2740 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2741 { 2742 2743 db_print_indent(indent); 2744 db_printf("%s at %p\n", name, tp); 2745 2746 indent += 2; 2747 2748 db_print_indent(indent); 2749 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2750 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2751 2752 db_print_indent(indent); 2753 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2754 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2755 2756 db_print_indent(indent); 2757 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2758 &tp->t_timers->tt_delack, tp->t_inpcb); 2759 2760 db_print_indent(indent); 2761 db_printf("t_state: %d (", tp->t_state); 2762 db_print_tstate(tp->t_state); 2763 db_printf(")\n"); 2764 2765 db_print_indent(indent); 2766 db_printf("t_flags: 0x%x (", tp->t_flags); 2767 db_print_tflags(tp->t_flags); 2768 db_printf(")\n"); 2769 2770 db_print_indent(indent); 2771 db_printf("t_flags2: 0x%x (", tp->t_flags2); 2772 db_print_tflags2(tp->t_flags2); 2773 db_printf(")\n"); 2774 2775 db_print_indent(indent); 2776 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2777 tp->snd_una, tp->snd_max, tp->snd_nxt); 2778 2779 db_print_indent(indent); 2780 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2781 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2782 2783 db_print_indent(indent); 2784 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2785 tp->iss, tp->irs, tp->rcv_nxt); 2786 2787 db_print_indent(indent); 2788 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2789 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2790 2791 db_print_indent(indent); 2792 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2793 tp->snd_wnd, tp->snd_cwnd); 2794 2795 db_print_indent(indent); 2796 db_printf("snd_ssthresh: %u snd_recover: " 2797 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2798 2799 db_print_indent(indent); 2800 db_printf("t_rcvtime: %u t_startime: %u\n", 2801 tp->t_rcvtime, tp->t_starttime); 2802 2803 db_print_indent(indent); 2804 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2805 tp->t_rtttime, tp->t_rtseq); 2806 2807 db_print_indent(indent); 2808 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2809 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2810 2811 db_print_indent(indent); 2812 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2813 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2814 tp->t_rttbest); 2815 2816 db_print_indent(indent); 2817 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2818 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2819 2820 db_print_indent(indent); 2821 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2822 db_print_toobflags(tp->t_oobflags); 2823 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2824 2825 db_print_indent(indent); 2826 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2827 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2828 2829 db_print_indent(indent); 2830 db_printf("ts_recent: %u ts_recent_age: %u\n", 2831 tp->ts_recent, tp->ts_recent_age); 2832 2833 db_print_indent(indent); 2834 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2835 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2836 2837 db_print_indent(indent); 2838 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2839 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2840 tp->snd_recover_prev, tp->t_badrxtwin); 2841 2842 db_print_indent(indent); 2843 db_printf("snd_numholes: %d snd_holes first: %p\n", 2844 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2845 2846 db_print_indent(indent); 2847 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2848 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2849 2850 /* Skip sackblks, sackhint. */ 2851 2852 db_print_indent(indent); 2853 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2854 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2855 } 2856 2857 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2858 { 2859 struct tcpcb *tp; 2860 2861 if (!have_addr) { 2862 db_printf("usage: show tcpcb <addr>\n"); 2863 return; 2864 } 2865 tp = (struct tcpcb *)addr; 2866 2867 db_print_tcpcb(tp, "tcpcb", 0); 2868 } 2869 #endif 2870