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/limits.h> 53 #include <sys/malloc.h> 54 #include <sys/refcount.h> 55 #include <sys/kernel.h> 56 #include <sys/ktls.h> 57 #include <sys/sysctl.h> 58 #include <sys/mbuf.h> 59 #ifdef INET6 60 #include <sys/domain.h> 61 #endif /* INET6 */ 62 #include <sys/socket.h> 63 #include <sys/socketvar.h> 64 #include <sys/protosw.h> 65 #include <sys/proc.h> 66 #include <sys/jail.h> 67 #include <sys/syslog.h> 68 69 #ifdef DDB 70 #include <ddb/ddb.h> 71 #endif 72 73 #include <net/if.h> 74 #include <net/if_var.h> 75 #include <net/route.h> 76 #include <net/vnet.h> 77 78 #include <netinet/in.h> 79 #include <netinet/in_kdtrace.h> 80 #include <netinet/in_pcb.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/in_var.h> 83 #include <netinet/ip_var.h> 84 #ifdef INET6 85 #include <netinet/ip6.h> 86 #include <netinet6/in6_pcb.h> 87 #include <netinet6/ip6_var.h> 88 #include <netinet6/scope6_var.h> 89 #endif 90 #include <netinet/tcp.h> 91 #include <netinet/tcp_fsm.h> 92 #include <netinet/tcp_seq.h> 93 #include <netinet/tcp_timer.h> 94 #include <netinet/tcp_var.h> 95 #include <netinet/tcp_log_buf.h> 96 #include <netinet/tcpip.h> 97 #include <netinet/cc/cc.h> 98 #include <netinet/tcp_fastopen.h> 99 #include <netinet/tcp_hpts.h> 100 #ifdef TCPPCAP 101 #include <netinet/tcp_pcap.h> 102 #endif 103 #ifdef TCPDEBUG 104 #include <netinet/tcp_debug.h> 105 #endif 106 #ifdef TCP_OFFLOAD 107 #include <netinet/tcp_offload.h> 108 #endif 109 #include <netipsec/ipsec_support.h> 110 111 /* 112 * TCP protocol interface to socket abstraction. 113 */ 114 static int tcp_attach(struct socket *); 115 #ifdef INET 116 static int tcp_connect(struct tcpcb *, struct sockaddr *, 117 struct thread *td); 118 #endif /* INET */ 119 #ifdef INET6 120 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 121 struct thread *td); 122 #endif /* INET6 */ 123 static void tcp_disconnect(struct tcpcb *); 124 static void tcp_usrclosed(struct tcpcb *); 125 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 126 127 #ifdef TCPDEBUG 128 #define TCPDEBUG0 int ostate = 0 129 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 130 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 131 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 132 #else 133 #define TCPDEBUG0 134 #define TCPDEBUG1() 135 #define TCPDEBUG2(req) 136 #endif 137 138 /* 139 * TCP attaches to socket via pru_attach(), reserving space, 140 * and an internet control block. 141 */ 142 static int 143 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 144 { 145 struct inpcb *inp; 146 struct tcpcb *tp = NULL; 147 int error; 148 TCPDEBUG0; 149 150 inp = sotoinpcb(so); 151 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 152 TCPDEBUG1(); 153 154 error = tcp_attach(so); 155 if (error) 156 goto out; 157 158 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 159 so->so_linger = TCP_LINGERTIME; 160 161 inp = sotoinpcb(so); 162 tp = intotcpcb(inp); 163 out: 164 TCPDEBUG2(PRU_ATTACH); 165 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 166 return error; 167 } 168 169 /* 170 * tcp_detach is called when the socket layer loses its final reference 171 * to the socket, be it a file descriptor reference, a reference from TCP, 172 * etc. At this point, there is only one case in which we will keep around 173 * inpcb state: time wait. 174 * 175 * This function can probably be re-absorbed back into tcp_usr_detach() now 176 * that there is a single detach path. 177 */ 178 static void 179 tcp_detach(struct socket *so, struct inpcb *inp) 180 { 181 struct tcpcb *tp; 182 183 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 184 INP_WLOCK_ASSERT(inp); 185 186 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 187 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 188 189 tp = intotcpcb(inp); 190 191 if (inp->inp_flags & INP_TIMEWAIT) { 192 /* 193 * There are two cases to handle: one in which the time wait 194 * state is being discarded (INP_DROPPED), and one in which 195 * this connection will remain in timewait. In the former, 196 * it is time to discard all state (except tcptw, which has 197 * already been discarded by the timewait close code, which 198 * should be further up the call stack somewhere). In the 199 * latter case, we detach from the socket, but leave the pcb 200 * present until timewait ends. 201 * 202 * XXXRW: Would it be cleaner to free the tcptw here? 203 * 204 * Astute question indeed, from twtcp perspective there are 205 * four cases to consider: 206 * 207 * #1 tcp_detach is called at tcptw creation time by 208 * tcp_twstart, then do not discard the newly created tcptw 209 * and leave inpcb present until timewait ends 210 * #2 tcp_detach is called at tcptw creation time by 211 * tcp_twstart, but connection is local and tw will be 212 * discarded immediately 213 * #3 tcp_detach is called at timewait end (or reuse) by 214 * tcp_twclose, then the tcptw has already been discarded 215 * (or reused) and inpcb is freed here 216 * #4 tcp_detach is called() after timewait ends (or reuse) 217 * (e.g. by soclose), then tcptw has already been discarded 218 * (or reused) and inpcb is freed here 219 * 220 * In all three cases the tcptw should not be freed here. 221 */ 222 if (inp->inp_flags & INP_DROPPED) { 223 in_pcbdetach(inp); 224 if (__predict_true(tp == NULL)) { 225 in_pcbfree(inp); 226 } else { 227 /* 228 * This case should not happen as in TIMEWAIT 229 * state the inp should not be destroyed before 230 * its tcptw. If INVARIANTS is defined, panic. 231 */ 232 #ifdef INVARIANTS 233 panic("%s: Panic before an inp double-free: " 234 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 235 , __func__); 236 #else 237 log(LOG_ERR, "%s: Avoid an inp double-free: " 238 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 239 , __func__); 240 #endif 241 INP_WUNLOCK(inp); 242 } 243 } else { 244 in_pcbdetach(inp); 245 INP_WUNLOCK(inp); 246 } 247 } else { 248 /* 249 * If the connection is not in timewait, we consider two 250 * two conditions: one in which no further processing is 251 * necessary (dropped || embryonic), and one in which TCP is 252 * not yet done, but no longer requires the socket, so the 253 * pcb will persist for the time being. 254 * 255 * XXXRW: Does the second case still occur? 256 */ 257 if (inp->inp_flags & INP_DROPPED || 258 tp->t_state < TCPS_SYN_SENT) { 259 tcp_discardcb(tp); 260 in_pcbdetach(inp); 261 in_pcbfree(inp); 262 } else { 263 in_pcbdetach(inp); 264 INP_WUNLOCK(inp); 265 } 266 } 267 } 268 269 /* 270 * pru_detach() detaches the TCP protocol from the socket. 271 * If the protocol state is non-embryonic, then can't 272 * do this directly: have to initiate a pru_disconnect(), 273 * which may finish later; embryonic TCB's can just 274 * be discarded here. 275 */ 276 static void 277 tcp_usr_detach(struct socket *so) 278 { 279 struct inpcb *inp; 280 int rlock = 0; 281 struct epoch_tracker et; 282 283 inp = sotoinpcb(so); 284 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 285 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 286 NET_EPOCH_ENTER(et); 287 rlock = 1; 288 } 289 INP_WLOCK(inp); 290 KASSERT(inp->inp_socket != NULL, 291 ("tcp_usr_detach: inp_socket == NULL")); 292 tcp_detach(so, inp); 293 if (rlock) 294 NET_EPOCH_EXIT(et); 295 } 296 297 #ifdef INET 298 /* 299 * Give the socket an address. 300 */ 301 static int 302 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 303 { 304 int error = 0; 305 struct inpcb *inp; 306 struct tcpcb *tp = NULL; 307 struct sockaddr_in *sinp; 308 309 sinp = (struct sockaddr_in *)nam; 310 if (nam->sa_len != sizeof (*sinp)) 311 return (EINVAL); 312 /* 313 * Must check for multicast addresses and disallow binding 314 * to them. 315 */ 316 if (sinp->sin_family == AF_INET && 317 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 318 return (EAFNOSUPPORT); 319 320 TCPDEBUG0; 321 inp = sotoinpcb(so); 322 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 323 INP_WLOCK(inp); 324 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 325 error = EINVAL; 326 goto out; 327 } 328 tp = intotcpcb(inp); 329 TCPDEBUG1(); 330 INP_HASH_WLOCK(&V_tcbinfo); 331 error = in_pcbbind(inp, nam, td->td_ucred); 332 INP_HASH_WUNLOCK(&V_tcbinfo); 333 out: 334 TCPDEBUG2(PRU_BIND); 335 TCP_PROBE2(debug__user, tp, PRU_BIND); 336 INP_WUNLOCK(inp); 337 338 return (error); 339 } 340 #endif /* INET */ 341 342 #ifdef INET6 343 static int 344 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 345 { 346 int error = 0; 347 struct inpcb *inp; 348 struct tcpcb *tp = NULL; 349 struct sockaddr_in6 *sin6; 350 u_char vflagsav; 351 352 sin6 = (struct sockaddr_in6 *)nam; 353 if (nam->sa_len != sizeof (*sin6)) 354 return (EINVAL); 355 /* 356 * Must check for multicast addresses and disallow binding 357 * to them. 358 */ 359 if (sin6->sin6_family == AF_INET6 && 360 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 361 return (EAFNOSUPPORT); 362 363 TCPDEBUG0; 364 inp = sotoinpcb(so); 365 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 366 INP_WLOCK(inp); 367 vflagsav = inp->inp_vflag; 368 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 369 error = EINVAL; 370 goto out; 371 } 372 tp = intotcpcb(inp); 373 TCPDEBUG1(); 374 INP_HASH_WLOCK(&V_tcbinfo); 375 inp->inp_vflag &= ~INP_IPV4; 376 inp->inp_vflag |= INP_IPV6; 377 #ifdef INET 378 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 379 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 380 inp->inp_vflag |= INP_IPV4; 381 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 382 struct sockaddr_in sin; 383 384 in6_sin6_2_sin(&sin, sin6); 385 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 386 error = EAFNOSUPPORT; 387 INP_HASH_WUNLOCK(&V_tcbinfo); 388 goto out; 389 } 390 inp->inp_vflag |= INP_IPV4; 391 inp->inp_vflag &= ~INP_IPV6; 392 error = in_pcbbind(inp, (struct sockaddr *)&sin, 393 td->td_ucred); 394 INP_HASH_WUNLOCK(&V_tcbinfo); 395 goto out; 396 } 397 } 398 #endif 399 error = in6_pcbbind(inp, nam, td->td_ucred); 400 INP_HASH_WUNLOCK(&V_tcbinfo); 401 out: 402 if (error != 0) 403 inp->inp_vflag = vflagsav; 404 TCPDEBUG2(PRU_BIND); 405 TCP_PROBE2(debug__user, tp, PRU_BIND); 406 INP_WUNLOCK(inp); 407 return (error); 408 } 409 #endif /* INET6 */ 410 411 #ifdef INET 412 /* 413 * Prepare to accept connections. 414 */ 415 static int 416 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 417 { 418 int error = 0; 419 struct inpcb *inp; 420 struct tcpcb *tp = NULL; 421 422 TCPDEBUG0; 423 inp = sotoinpcb(so); 424 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 425 INP_WLOCK(inp); 426 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 427 error = EINVAL; 428 goto out; 429 } 430 tp = intotcpcb(inp); 431 TCPDEBUG1(); 432 SOCK_LOCK(so); 433 error = solisten_proto_check(so); 434 INP_HASH_WLOCK(&V_tcbinfo); 435 if (error == 0 && inp->inp_lport == 0) 436 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 437 INP_HASH_WUNLOCK(&V_tcbinfo); 438 if (error == 0) { 439 tcp_state_change(tp, TCPS_LISTEN); 440 solisten_proto(so, backlog); 441 #ifdef TCP_OFFLOAD 442 if ((so->so_options & SO_NO_OFFLOAD) == 0) 443 tcp_offload_listen_start(tp); 444 #endif 445 } 446 SOCK_UNLOCK(so); 447 448 if (IS_FASTOPEN(tp->t_flags)) 449 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 450 451 out: 452 TCPDEBUG2(PRU_LISTEN); 453 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 454 INP_WUNLOCK(inp); 455 return (error); 456 } 457 #endif /* INET */ 458 459 #ifdef INET6 460 static int 461 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 462 { 463 int error = 0; 464 struct inpcb *inp; 465 struct tcpcb *tp = NULL; 466 u_char vflagsav; 467 468 TCPDEBUG0; 469 inp = sotoinpcb(so); 470 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 471 INP_WLOCK(inp); 472 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 473 error = EINVAL; 474 goto out; 475 } 476 vflagsav = inp->inp_vflag; 477 tp = intotcpcb(inp); 478 TCPDEBUG1(); 479 SOCK_LOCK(so); 480 error = solisten_proto_check(so); 481 INP_HASH_WLOCK(&V_tcbinfo); 482 if (error == 0 && inp->inp_lport == 0) { 483 inp->inp_vflag &= ~INP_IPV4; 484 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 485 inp->inp_vflag |= INP_IPV4; 486 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 487 } 488 INP_HASH_WUNLOCK(&V_tcbinfo); 489 if (error == 0) { 490 tcp_state_change(tp, TCPS_LISTEN); 491 solisten_proto(so, backlog); 492 #ifdef TCP_OFFLOAD 493 if ((so->so_options & SO_NO_OFFLOAD) == 0) 494 tcp_offload_listen_start(tp); 495 #endif 496 } 497 SOCK_UNLOCK(so); 498 499 if (IS_FASTOPEN(tp->t_flags)) 500 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 501 502 if (error != 0) 503 inp->inp_vflag = vflagsav; 504 505 out: 506 TCPDEBUG2(PRU_LISTEN); 507 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 508 INP_WUNLOCK(inp); 509 return (error); 510 } 511 #endif /* INET6 */ 512 513 #ifdef INET 514 /* 515 * Initiate connection to peer. 516 * Create a template for use in transmissions on this connection. 517 * Enter SYN_SENT state, and mark socket as connecting. 518 * Start keep-alive timer, and seed output sequence space. 519 * Send initial segment on connection. 520 */ 521 static int 522 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 523 { 524 int error = 0; 525 struct inpcb *inp; 526 struct tcpcb *tp = NULL; 527 struct sockaddr_in *sinp; 528 529 sinp = (struct sockaddr_in *)nam; 530 if (nam->sa_len != sizeof (*sinp)) 531 return (EINVAL); 532 /* 533 * Must disallow TCP ``connections'' to multicast addresses. 534 */ 535 if (sinp->sin_family == AF_INET 536 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 537 return (EAFNOSUPPORT); 538 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 539 return (error); 540 541 TCPDEBUG0; 542 inp = sotoinpcb(so); 543 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 544 INP_WLOCK(inp); 545 if (inp->inp_flags & INP_TIMEWAIT) { 546 error = EADDRINUSE; 547 goto out; 548 } 549 if (inp->inp_flags & INP_DROPPED) { 550 error = ECONNREFUSED; 551 goto out; 552 } 553 tp = intotcpcb(inp); 554 TCPDEBUG1(); 555 if ((error = tcp_connect(tp, nam, td)) != 0) 556 goto out; 557 #ifdef TCP_OFFLOAD 558 if (registered_toedevs > 0 && 559 (so->so_options & SO_NO_OFFLOAD) == 0 && 560 (error = tcp_offload_connect(so, nam)) == 0) 561 goto out; 562 #endif 563 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 564 error = tp->t_fb->tfb_tcp_output(tp); 565 out: 566 TCPDEBUG2(PRU_CONNECT); 567 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 568 INP_WUNLOCK(inp); 569 return (error); 570 } 571 #endif /* INET */ 572 573 #ifdef INET6 574 static int 575 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 576 { 577 int error = 0; 578 struct inpcb *inp; 579 struct tcpcb *tp = NULL; 580 struct sockaddr_in6 *sin6; 581 u_int8_t incflagsav; 582 u_char vflagsav; 583 584 TCPDEBUG0; 585 586 sin6 = (struct sockaddr_in6 *)nam; 587 if (nam->sa_len != sizeof (*sin6)) 588 return (EINVAL); 589 /* 590 * Must disallow TCP ``connections'' to multicast addresses. 591 */ 592 if (sin6->sin6_family == AF_INET6 593 && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 594 return (EAFNOSUPPORT); 595 596 inp = sotoinpcb(so); 597 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 598 INP_WLOCK(inp); 599 vflagsav = inp->inp_vflag; 600 incflagsav = inp->inp_inc.inc_flags; 601 if (inp->inp_flags & INP_TIMEWAIT) { 602 error = EADDRINUSE; 603 goto out; 604 } 605 if (inp->inp_flags & INP_DROPPED) { 606 error = ECONNREFUSED; 607 goto out; 608 } 609 tp = intotcpcb(inp); 610 TCPDEBUG1(); 611 #ifdef INET 612 /* 613 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 614 * therefore probably require the hash lock, which isn't held here. 615 * Is this a significant problem? 616 */ 617 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 618 struct sockaddr_in sin; 619 620 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 621 error = EINVAL; 622 goto out; 623 } 624 if ((inp->inp_vflag & INP_IPV4) == 0) { 625 error = EAFNOSUPPORT; 626 goto out; 627 } 628 629 in6_sin6_2_sin(&sin, sin6); 630 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 631 error = EAFNOSUPPORT; 632 goto out; 633 } 634 if ((error = prison_remote_ip4(td->td_ucred, 635 &sin.sin_addr)) != 0) 636 goto out; 637 inp->inp_vflag |= INP_IPV4; 638 inp->inp_vflag &= ~INP_IPV6; 639 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 640 goto out; 641 #ifdef TCP_OFFLOAD 642 if (registered_toedevs > 0 && 643 (so->so_options & SO_NO_OFFLOAD) == 0 && 644 (error = tcp_offload_connect(so, nam)) == 0) 645 goto out; 646 #endif 647 error = tp->t_fb->tfb_tcp_output(tp); 648 goto out; 649 } else { 650 if ((inp->inp_vflag & INP_IPV6) == 0) { 651 error = EAFNOSUPPORT; 652 goto out; 653 } 654 } 655 #endif 656 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 657 goto out; 658 inp->inp_vflag &= ~INP_IPV4; 659 inp->inp_vflag |= INP_IPV6; 660 inp->inp_inc.inc_flags |= INC_ISIPV6; 661 if ((error = tcp6_connect(tp, nam, td)) != 0) 662 goto out; 663 #ifdef TCP_OFFLOAD 664 if (registered_toedevs > 0 && 665 (so->so_options & SO_NO_OFFLOAD) == 0 && 666 (error = tcp_offload_connect(so, nam)) == 0) 667 goto out; 668 #endif 669 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 670 error = tp->t_fb->tfb_tcp_output(tp); 671 672 out: 673 /* 674 * If the implicit bind in the connect call fails, restore 675 * the flags we modified. 676 */ 677 if (error != 0 && inp->inp_lport == 0) { 678 inp->inp_vflag = vflagsav; 679 inp->inp_inc.inc_flags = incflagsav; 680 } 681 682 TCPDEBUG2(PRU_CONNECT); 683 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 684 INP_WUNLOCK(inp); 685 return (error); 686 } 687 #endif /* INET6 */ 688 689 /* 690 * Initiate disconnect from peer. 691 * If connection never passed embryonic stage, just drop; 692 * else if don't need to let data drain, then can just drop anyways, 693 * else have to begin TCP shutdown process: mark socket disconnecting, 694 * drain unread data, state switch to reflect user close, and 695 * send segment (e.g. FIN) to peer. Socket will be really disconnected 696 * when peer sends FIN and acks ours. 697 * 698 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 699 */ 700 static int 701 tcp_usr_disconnect(struct socket *so) 702 { 703 struct inpcb *inp; 704 struct tcpcb *tp = NULL; 705 struct epoch_tracker et; 706 int error = 0; 707 708 TCPDEBUG0; 709 NET_EPOCH_ENTER(et); 710 inp = sotoinpcb(so); 711 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 712 INP_WLOCK(inp); 713 if (inp->inp_flags & INP_TIMEWAIT) 714 goto out; 715 if (inp->inp_flags & INP_DROPPED) { 716 error = ECONNRESET; 717 goto out; 718 } 719 tp = intotcpcb(inp); 720 TCPDEBUG1(); 721 tcp_disconnect(tp); 722 out: 723 TCPDEBUG2(PRU_DISCONNECT); 724 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 725 INP_WUNLOCK(inp); 726 NET_EPOCH_EXIT(et); 727 return (error); 728 } 729 730 #ifdef INET 731 /* 732 * Accept a connection. Essentially all the work is done at higher levels; 733 * just return the address of the peer, storing through addr. 734 */ 735 static int 736 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 737 { 738 int error = 0; 739 struct inpcb *inp = NULL; 740 struct tcpcb *tp = NULL; 741 struct in_addr addr; 742 in_port_t port = 0; 743 TCPDEBUG0; 744 745 if (so->so_state & SS_ISDISCONNECTED) 746 return (ECONNABORTED); 747 748 inp = sotoinpcb(so); 749 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 750 INP_WLOCK(inp); 751 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 752 error = ECONNABORTED; 753 goto out; 754 } 755 tp = intotcpcb(inp); 756 TCPDEBUG1(); 757 758 /* 759 * We inline in_getpeeraddr and COMMON_END here, so that we can 760 * copy the data of interest and defer the malloc until after we 761 * release the lock. 762 */ 763 port = inp->inp_fport; 764 addr = inp->inp_faddr; 765 766 out: 767 TCPDEBUG2(PRU_ACCEPT); 768 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 769 INP_WUNLOCK(inp); 770 if (error == 0) 771 *nam = in_sockaddr(port, &addr); 772 return error; 773 } 774 #endif /* INET */ 775 776 #ifdef INET6 777 static int 778 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 779 { 780 struct inpcb *inp = NULL; 781 int error = 0; 782 struct tcpcb *tp = NULL; 783 struct in_addr addr; 784 struct in6_addr addr6; 785 struct epoch_tracker et; 786 in_port_t port = 0; 787 int v4 = 0; 788 TCPDEBUG0; 789 790 if (so->so_state & SS_ISDISCONNECTED) 791 return (ECONNABORTED); 792 793 inp = sotoinpcb(so); 794 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 795 NET_EPOCH_ENTER(et); 796 INP_WLOCK(inp); 797 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 798 error = ECONNABORTED; 799 goto out; 800 } 801 tp = intotcpcb(inp); 802 TCPDEBUG1(); 803 804 /* 805 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 806 * copy the data of interest and defer the malloc until after we 807 * release the lock. 808 */ 809 if (inp->inp_vflag & INP_IPV4) { 810 v4 = 1; 811 port = inp->inp_fport; 812 addr = inp->inp_faddr; 813 } else { 814 port = inp->inp_fport; 815 addr6 = inp->in6p_faddr; 816 } 817 818 out: 819 TCPDEBUG2(PRU_ACCEPT); 820 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 821 INP_WUNLOCK(inp); 822 NET_EPOCH_EXIT(et); 823 if (error == 0) { 824 if (v4) 825 *nam = in6_v4mapsin6_sockaddr(port, &addr); 826 else 827 *nam = in6_sockaddr(port, &addr6); 828 } 829 return error; 830 } 831 #endif /* INET6 */ 832 833 /* 834 * Mark the connection as being incapable of further output. 835 */ 836 static int 837 tcp_usr_shutdown(struct socket *so) 838 { 839 int error = 0; 840 struct inpcb *inp; 841 struct tcpcb *tp = NULL; 842 struct epoch_tracker et; 843 844 TCPDEBUG0; 845 NET_EPOCH_ENTER(et); 846 inp = sotoinpcb(so); 847 KASSERT(inp != NULL, ("inp == NULL")); 848 INP_WLOCK(inp); 849 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 850 error = ECONNRESET; 851 goto out; 852 } 853 tp = intotcpcb(inp); 854 TCPDEBUG1(); 855 socantsendmore(so); 856 tcp_usrclosed(tp); 857 if (!(inp->inp_flags & INP_DROPPED)) 858 error = tp->t_fb->tfb_tcp_output(tp); 859 860 out: 861 TCPDEBUG2(PRU_SHUTDOWN); 862 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 863 INP_WUNLOCK(inp); 864 NET_EPOCH_EXIT(et); 865 866 return (error); 867 } 868 869 /* 870 * After a receive, possibly send window update to peer. 871 */ 872 static int 873 tcp_usr_rcvd(struct socket *so, int flags) 874 { 875 struct inpcb *inp; 876 struct tcpcb *tp = NULL; 877 int error = 0; 878 879 TCPDEBUG0; 880 inp = sotoinpcb(so); 881 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 882 INP_WLOCK(inp); 883 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 884 error = ECONNRESET; 885 goto out; 886 } 887 tp = intotcpcb(inp); 888 TCPDEBUG1(); 889 /* 890 * For passively-created TFO connections, don't attempt a window 891 * update while still in SYN_RECEIVED as this may trigger an early 892 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 893 * application response data, or failing that, when the DELACK timer 894 * expires. 895 */ 896 if (IS_FASTOPEN(tp->t_flags) && 897 (tp->t_state == TCPS_SYN_RECEIVED)) 898 goto out; 899 #ifdef TCP_OFFLOAD 900 if (tp->t_flags & TF_TOE) 901 tcp_offload_rcvd(tp); 902 else 903 #endif 904 tp->t_fb->tfb_tcp_output(tp); 905 906 out: 907 TCPDEBUG2(PRU_RCVD); 908 TCP_PROBE2(debug__user, tp, PRU_RCVD); 909 INP_WUNLOCK(inp); 910 return (error); 911 } 912 913 /* 914 * Do a send by putting data in output queue and updating urgent 915 * marker if URG set. Possibly send more data. Unlike the other 916 * pru_*() routines, the mbuf chains are our responsibility. We 917 * must either enqueue them or free them. The other pru_* routines 918 * generally are caller-frees. 919 */ 920 static int 921 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 922 struct sockaddr *nam, struct mbuf *control, struct thread *td) 923 { 924 struct epoch_tracker et; 925 int error = 0; 926 struct inpcb *inp; 927 struct tcpcb *tp = NULL; 928 #ifdef INET 929 #ifdef INET6 930 struct sockaddr_in sin; 931 #endif 932 struct sockaddr_in *sinp; 933 #endif 934 #ifdef INET6 935 int isipv6; 936 #endif 937 u_int8_t incflagsav; 938 u_char vflagsav; 939 bool restoreflags; 940 TCPDEBUG0; 941 942 /* 943 * We require the pcbinfo "read lock" if we will close the socket 944 * as part of this call. 945 */ 946 if (flags & PRUS_EOF) 947 NET_EPOCH_ENTER(et); 948 inp = sotoinpcb(so); 949 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 950 INP_WLOCK(inp); 951 vflagsav = inp->inp_vflag; 952 incflagsav = inp->inp_inc.inc_flags; 953 restoreflags = false; 954 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 955 if (control) 956 m_freem(control); 957 /* 958 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 959 * for freeing memory. 960 */ 961 if (m && (flags & PRUS_NOTREADY) == 0) 962 m_freem(m); 963 error = ECONNRESET; 964 goto out; 965 } 966 tp = intotcpcb(inp); 967 TCPDEBUG1(); 968 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 969 switch (nam->sa_family) { 970 #ifdef INET 971 case AF_INET: 972 sinp = (struct sockaddr_in *)nam; 973 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 974 if (m) 975 m_freem(m); 976 error = EINVAL; 977 goto out; 978 } 979 if ((inp->inp_vflag & INP_IPV6) != 0) { 980 if (m) 981 m_freem(m); 982 error = EAFNOSUPPORT; 983 goto out; 984 } 985 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 986 if (m) 987 m_freem(m); 988 error = EAFNOSUPPORT; 989 goto out; 990 } 991 if ((error = prison_remote_ip4(td->td_ucred, 992 &sinp->sin_addr))) { 993 if (m) 994 m_freem(m); 995 goto out; 996 } 997 #ifdef INET6 998 isipv6 = 0; 999 #endif 1000 break; 1001 #endif /* INET */ 1002 #ifdef INET6 1003 case AF_INET6: 1004 { 1005 struct sockaddr_in6 *sin6; 1006 1007 sin6 = (struct sockaddr_in6 *)nam; 1008 if (sin6->sin6_len != sizeof(*sin6)) { 1009 if (m) 1010 m_freem(m); 1011 error = EINVAL; 1012 goto out; 1013 } 1014 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1015 if (m) 1016 m_freem(m); 1017 error = EAFNOSUPPORT; 1018 goto out; 1019 } 1020 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1021 #ifdef INET 1022 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1023 error = EINVAL; 1024 if (m) 1025 m_freem(m); 1026 goto out; 1027 } 1028 if ((inp->inp_vflag & INP_IPV4) == 0) { 1029 error = EAFNOSUPPORT; 1030 if (m) 1031 m_freem(m); 1032 goto out; 1033 } 1034 restoreflags = true; 1035 inp->inp_vflag &= ~INP_IPV6; 1036 sinp = &sin; 1037 in6_sin6_2_sin(sinp, sin6); 1038 if (IN_MULTICAST( 1039 ntohl(sinp->sin_addr.s_addr))) { 1040 error = EAFNOSUPPORT; 1041 if (m) 1042 m_freem(m); 1043 goto out; 1044 } 1045 if ((error = prison_remote_ip4(td->td_ucred, 1046 &sinp->sin_addr))) { 1047 if (m) 1048 m_freem(m); 1049 goto out; 1050 } 1051 isipv6 = 0; 1052 #else /* !INET */ 1053 error = EAFNOSUPPORT; 1054 if (m) 1055 m_freem(m); 1056 goto out; 1057 #endif /* INET */ 1058 } else { 1059 if ((inp->inp_vflag & INP_IPV6) == 0) { 1060 if (m) 1061 m_freem(m); 1062 error = EAFNOSUPPORT; 1063 goto out; 1064 } 1065 restoreflags = true; 1066 inp->inp_vflag &= ~INP_IPV4; 1067 inp->inp_inc.inc_flags |= INC_ISIPV6; 1068 if ((error = prison_remote_ip6(td->td_ucred, 1069 &sin6->sin6_addr))) { 1070 if (m) 1071 m_freem(m); 1072 goto out; 1073 } 1074 isipv6 = 1; 1075 } 1076 break; 1077 } 1078 #endif /* INET6 */ 1079 default: 1080 if (m) 1081 m_freem(m); 1082 error = EAFNOSUPPORT; 1083 goto out; 1084 } 1085 } 1086 if (control) { 1087 /* TCP doesn't do control messages (rights, creds, etc) */ 1088 if (control->m_len) { 1089 m_freem(control); 1090 if (m) 1091 m_freem(m); 1092 error = EINVAL; 1093 goto out; 1094 } 1095 m_freem(control); /* empty control, just free it */ 1096 } 1097 if (!(flags & PRUS_OOB)) { 1098 sbappendstream(&so->so_snd, m, flags); 1099 if (nam && tp->t_state < TCPS_SYN_SENT) { 1100 /* 1101 * Do implied connect if not yet connected, 1102 * initialize window to default value, and 1103 * initialize maxseg using peer's cached MSS. 1104 */ 1105 #ifdef INET6 1106 if (isipv6) 1107 error = tcp6_connect(tp, nam, td); 1108 #endif /* INET6 */ 1109 #if defined(INET6) && defined(INET) 1110 else 1111 #endif 1112 #ifdef INET 1113 error = tcp_connect(tp, 1114 (struct sockaddr *)sinp, td); 1115 #endif 1116 /* 1117 * The bind operation in tcp_connect succeeded. We 1118 * no longer want to restore the flags if later 1119 * operations fail. 1120 */ 1121 if (error == 0 || inp->inp_lport != 0) 1122 restoreflags = false; 1123 1124 if (error) 1125 goto out; 1126 if (IS_FASTOPEN(tp->t_flags)) 1127 tcp_fastopen_connect(tp); 1128 else { 1129 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1130 tcp_mss(tp, -1); 1131 } 1132 } 1133 if (flags & PRUS_EOF) { 1134 /* 1135 * Close the send side of the connection after 1136 * the data is sent. 1137 */ 1138 NET_EPOCH_ASSERT(); 1139 socantsendmore(so); 1140 tcp_usrclosed(tp); 1141 } 1142 if (!(inp->inp_flags & INP_DROPPED) && 1143 !(flags & PRUS_NOTREADY)) { 1144 if (flags & PRUS_MORETOCOME) 1145 tp->t_flags |= TF_MORETOCOME; 1146 error = tp->t_fb->tfb_tcp_output(tp); 1147 if (flags & PRUS_MORETOCOME) 1148 tp->t_flags &= ~TF_MORETOCOME; 1149 } 1150 } else { 1151 /* 1152 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1153 */ 1154 SOCKBUF_LOCK(&so->so_snd); 1155 if (sbspace(&so->so_snd) < -512) { 1156 SOCKBUF_UNLOCK(&so->so_snd); 1157 m_freem(m); 1158 error = ENOBUFS; 1159 goto out; 1160 } 1161 /* 1162 * According to RFC961 (Assigned Protocols), 1163 * the urgent pointer points to the last octet 1164 * of urgent data. We continue, however, 1165 * to consider it to indicate the first octet 1166 * of data past the urgent section. 1167 * Otherwise, snd_up should be one lower. 1168 */ 1169 sbappendstream_locked(&so->so_snd, m, flags); 1170 SOCKBUF_UNLOCK(&so->so_snd); 1171 if (nam && tp->t_state < TCPS_SYN_SENT) { 1172 /* 1173 * Do implied connect if not yet connected, 1174 * initialize window to default value, and 1175 * initialize maxseg using peer's cached MSS. 1176 */ 1177 1178 /* 1179 * Not going to contemplate SYN|URG 1180 */ 1181 if (IS_FASTOPEN(tp->t_flags)) 1182 tp->t_flags &= ~TF_FASTOPEN; 1183 #ifdef INET6 1184 if (isipv6) 1185 error = tcp6_connect(tp, nam, td); 1186 #endif /* INET6 */ 1187 #if defined(INET6) && defined(INET) 1188 else 1189 #endif 1190 #ifdef INET 1191 error = tcp_connect(tp, 1192 (struct sockaddr *)sinp, td); 1193 #endif 1194 /* 1195 * The bind operation in tcp_connect succeeded. We 1196 * no longer want to restore the flags if later 1197 * operations fail. 1198 */ 1199 if (error == 0 || inp->inp_lport != 0) 1200 restoreflags = false; 1201 1202 if (error) 1203 goto out; 1204 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1205 tcp_mss(tp, -1); 1206 } 1207 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1208 if (!(flags & PRUS_NOTREADY)) { 1209 tp->t_flags |= TF_FORCEDATA; 1210 error = tp->t_fb->tfb_tcp_output(tp); 1211 tp->t_flags &= ~TF_FORCEDATA; 1212 } 1213 } 1214 TCP_LOG_EVENT(tp, NULL, 1215 &inp->inp_socket->so_rcv, 1216 &inp->inp_socket->so_snd, 1217 TCP_LOG_USERSEND, error, 1218 0, NULL, false); 1219 out: 1220 /* 1221 * If the request was unsuccessful and we changed flags, 1222 * restore the original flags. 1223 */ 1224 if (error != 0 && restoreflags) { 1225 inp->inp_vflag = vflagsav; 1226 inp->inp_inc.inc_flags = incflagsav; 1227 } 1228 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1229 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1230 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1231 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1232 INP_WUNLOCK(inp); 1233 if (flags & PRUS_EOF) 1234 NET_EPOCH_EXIT(et); 1235 return (error); 1236 } 1237 1238 static int 1239 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1240 { 1241 struct inpcb *inp; 1242 struct tcpcb *tp; 1243 int error; 1244 1245 inp = sotoinpcb(so); 1246 INP_WLOCK(inp); 1247 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1248 INP_WUNLOCK(inp); 1249 mb_free_notready(m, count); 1250 return (ECONNRESET); 1251 } 1252 tp = intotcpcb(inp); 1253 1254 SOCKBUF_LOCK(&so->so_snd); 1255 error = sbready(&so->so_snd, m, count); 1256 SOCKBUF_UNLOCK(&so->so_snd); 1257 if (error == 0) 1258 error = tp->t_fb->tfb_tcp_output(tp); 1259 INP_WUNLOCK(inp); 1260 1261 return (error); 1262 } 1263 1264 /* 1265 * Abort the TCP. Drop the connection abruptly. 1266 */ 1267 static void 1268 tcp_usr_abort(struct socket *so) 1269 { 1270 struct inpcb *inp; 1271 struct tcpcb *tp = NULL; 1272 struct epoch_tracker et; 1273 TCPDEBUG0; 1274 1275 inp = sotoinpcb(so); 1276 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1277 1278 NET_EPOCH_ENTER(et); 1279 INP_WLOCK(inp); 1280 KASSERT(inp->inp_socket != NULL, 1281 ("tcp_usr_abort: inp_socket == NULL")); 1282 1283 /* 1284 * If we still have full TCP state, and we're not dropped, drop. 1285 */ 1286 if (!(inp->inp_flags & INP_TIMEWAIT) && 1287 !(inp->inp_flags & INP_DROPPED)) { 1288 tp = intotcpcb(inp); 1289 TCPDEBUG1(); 1290 tp = tcp_drop(tp, ECONNABORTED); 1291 if (tp == NULL) 1292 goto dropped; 1293 TCPDEBUG2(PRU_ABORT); 1294 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1295 } 1296 if (!(inp->inp_flags & INP_DROPPED)) { 1297 SOCK_LOCK(so); 1298 so->so_state |= SS_PROTOREF; 1299 SOCK_UNLOCK(so); 1300 inp->inp_flags |= INP_SOCKREF; 1301 } 1302 INP_WUNLOCK(inp); 1303 dropped: 1304 NET_EPOCH_EXIT(et); 1305 } 1306 1307 /* 1308 * TCP socket is closed. Start friendly disconnect. 1309 */ 1310 static void 1311 tcp_usr_close(struct socket *so) 1312 { 1313 struct inpcb *inp; 1314 struct tcpcb *tp = NULL; 1315 struct epoch_tracker et; 1316 TCPDEBUG0; 1317 1318 inp = sotoinpcb(so); 1319 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1320 1321 NET_EPOCH_ENTER(et); 1322 INP_WLOCK(inp); 1323 KASSERT(inp->inp_socket != NULL, 1324 ("tcp_usr_close: inp_socket == NULL")); 1325 1326 /* 1327 * If we still have full TCP state, and we're not dropped, initiate 1328 * a disconnect. 1329 */ 1330 if (!(inp->inp_flags & INP_TIMEWAIT) && 1331 !(inp->inp_flags & INP_DROPPED)) { 1332 tp = intotcpcb(inp); 1333 TCPDEBUG1(); 1334 tcp_disconnect(tp); 1335 TCPDEBUG2(PRU_CLOSE); 1336 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1337 } 1338 if (!(inp->inp_flags & INP_DROPPED)) { 1339 SOCK_LOCK(so); 1340 so->so_state |= SS_PROTOREF; 1341 SOCK_UNLOCK(so); 1342 inp->inp_flags |= INP_SOCKREF; 1343 } 1344 INP_WUNLOCK(inp); 1345 NET_EPOCH_EXIT(et); 1346 } 1347 1348 /* 1349 * Receive out-of-band data. 1350 */ 1351 static int 1352 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1353 { 1354 int error = 0; 1355 struct inpcb *inp; 1356 struct tcpcb *tp = NULL; 1357 1358 TCPDEBUG0; 1359 inp = sotoinpcb(so); 1360 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1361 INP_WLOCK(inp); 1362 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1363 error = ECONNRESET; 1364 goto out; 1365 } 1366 tp = intotcpcb(inp); 1367 TCPDEBUG1(); 1368 if ((so->so_oobmark == 0 && 1369 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1370 so->so_options & SO_OOBINLINE || 1371 tp->t_oobflags & TCPOOB_HADDATA) { 1372 error = EINVAL; 1373 goto out; 1374 } 1375 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1376 error = EWOULDBLOCK; 1377 goto out; 1378 } 1379 m->m_len = 1; 1380 *mtod(m, caddr_t) = tp->t_iobc; 1381 if ((flags & MSG_PEEK) == 0) 1382 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1383 1384 out: 1385 TCPDEBUG2(PRU_RCVOOB); 1386 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1387 INP_WUNLOCK(inp); 1388 return (error); 1389 } 1390 1391 #ifdef INET 1392 struct pr_usrreqs tcp_usrreqs = { 1393 .pru_abort = tcp_usr_abort, 1394 .pru_accept = tcp_usr_accept, 1395 .pru_attach = tcp_usr_attach, 1396 .pru_bind = tcp_usr_bind, 1397 .pru_connect = tcp_usr_connect, 1398 .pru_control = in_control, 1399 .pru_detach = tcp_usr_detach, 1400 .pru_disconnect = tcp_usr_disconnect, 1401 .pru_listen = tcp_usr_listen, 1402 .pru_peeraddr = in_getpeeraddr, 1403 .pru_rcvd = tcp_usr_rcvd, 1404 .pru_rcvoob = tcp_usr_rcvoob, 1405 .pru_send = tcp_usr_send, 1406 .pru_ready = tcp_usr_ready, 1407 .pru_shutdown = tcp_usr_shutdown, 1408 .pru_sockaddr = in_getsockaddr, 1409 .pru_sosetlabel = in_pcbsosetlabel, 1410 .pru_close = tcp_usr_close, 1411 }; 1412 #endif /* INET */ 1413 1414 #ifdef INET6 1415 struct pr_usrreqs tcp6_usrreqs = { 1416 .pru_abort = tcp_usr_abort, 1417 .pru_accept = tcp6_usr_accept, 1418 .pru_attach = tcp_usr_attach, 1419 .pru_bind = tcp6_usr_bind, 1420 .pru_connect = tcp6_usr_connect, 1421 .pru_control = in6_control, 1422 .pru_detach = tcp_usr_detach, 1423 .pru_disconnect = tcp_usr_disconnect, 1424 .pru_listen = tcp6_usr_listen, 1425 .pru_peeraddr = in6_mapped_peeraddr, 1426 .pru_rcvd = tcp_usr_rcvd, 1427 .pru_rcvoob = tcp_usr_rcvoob, 1428 .pru_send = tcp_usr_send, 1429 .pru_ready = tcp_usr_ready, 1430 .pru_shutdown = tcp_usr_shutdown, 1431 .pru_sockaddr = in6_mapped_sockaddr, 1432 .pru_sosetlabel = in_pcbsosetlabel, 1433 .pru_close = tcp_usr_close, 1434 }; 1435 #endif /* INET6 */ 1436 1437 #ifdef INET 1438 /* 1439 * Common subroutine to open a TCP connection to remote host specified 1440 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1441 * port number if needed. Call in_pcbconnect_setup to do the routing and 1442 * to choose a local host address (interface). If there is an existing 1443 * incarnation of the same connection in TIME-WAIT state and if the remote 1444 * host was sending CC options and if the connection duration was < MSL, then 1445 * truncate the previous TIME-WAIT state and proceed. 1446 * Initialize connection parameters and enter SYN-SENT state. 1447 */ 1448 static int 1449 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1450 { 1451 struct inpcb *inp = tp->t_inpcb, *oinp; 1452 struct socket *so = inp->inp_socket; 1453 struct in_addr laddr; 1454 u_short lport; 1455 int error; 1456 1457 INP_WLOCK_ASSERT(inp); 1458 INP_HASH_WLOCK(&V_tcbinfo); 1459 1460 if (inp->inp_lport == 0) { 1461 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1462 if (error) 1463 goto out; 1464 } 1465 1466 /* 1467 * Cannot simply call in_pcbconnect, because there might be an 1468 * earlier incarnation of this same connection still in 1469 * TIME_WAIT state, creating an ADDRINUSE error. 1470 */ 1471 laddr = inp->inp_laddr; 1472 lport = inp->inp_lport; 1473 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1474 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1475 if (error && oinp == NULL) 1476 goto out; 1477 if (oinp) { 1478 error = EADDRINUSE; 1479 goto out; 1480 } 1481 inp->inp_laddr = laddr; 1482 in_pcbrehash(inp); 1483 INP_HASH_WUNLOCK(&V_tcbinfo); 1484 1485 /* 1486 * Compute window scaling to request: 1487 * Scale to fit into sweet spot. See tcp_syncache.c. 1488 * XXX: This should move to tcp_output(). 1489 */ 1490 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1491 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1492 tp->request_r_scale++; 1493 1494 soisconnecting(so); 1495 TCPSTAT_INC(tcps_connattempt); 1496 tcp_state_change(tp, TCPS_SYN_SENT); 1497 tp->iss = tcp_new_isn(&inp->inp_inc); 1498 if (tp->t_flags & TF_REQ_TSTMP) 1499 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1500 tcp_sendseqinit(tp); 1501 1502 return 0; 1503 1504 out: 1505 INP_HASH_WUNLOCK(&V_tcbinfo); 1506 return (error); 1507 } 1508 #endif /* INET */ 1509 1510 #ifdef INET6 1511 static int 1512 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1513 { 1514 struct inpcb *inp = tp->t_inpcb; 1515 int error; 1516 1517 INP_WLOCK_ASSERT(inp); 1518 INP_HASH_WLOCK(&V_tcbinfo); 1519 1520 if (inp->inp_lport == 0) { 1521 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1522 if (error) 1523 goto out; 1524 } 1525 error = in6_pcbconnect(inp, nam, td->td_ucred); 1526 if (error != 0) 1527 goto out; 1528 INP_HASH_WUNLOCK(&V_tcbinfo); 1529 1530 /* Compute window scaling to request. */ 1531 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1532 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1533 tp->request_r_scale++; 1534 1535 soisconnecting(inp->inp_socket); 1536 TCPSTAT_INC(tcps_connattempt); 1537 tcp_state_change(tp, TCPS_SYN_SENT); 1538 tp->iss = tcp_new_isn(&inp->inp_inc); 1539 if (tp->t_flags & TF_REQ_TSTMP) 1540 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1541 tcp_sendseqinit(tp); 1542 1543 return 0; 1544 1545 out: 1546 INP_HASH_WUNLOCK(&V_tcbinfo); 1547 return error; 1548 } 1549 #endif /* INET6 */ 1550 1551 /* 1552 * Export TCP internal state information via a struct tcp_info, based on the 1553 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1554 * (TCP state machine, etc). We export all information using FreeBSD-native 1555 * constants -- for example, the numeric values for tcpi_state will differ 1556 * from Linux. 1557 */ 1558 static void 1559 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1560 { 1561 1562 INP_WLOCK_ASSERT(tp->t_inpcb); 1563 bzero(ti, sizeof(*ti)); 1564 1565 ti->tcpi_state = tp->t_state; 1566 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1567 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1568 if (tp->t_flags & TF_SACK_PERMIT) 1569 ti->tcpi_options |= TCPI_OPT_SACK; 1570 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1571 ti->tcpi_options |= TCPI_OPT_WSCALE; 1572 ti->tcpi_snd_wscale = tp->snd_scale; 1573 ti->tcpi_rcv_wscale = tp->rcv_scale; 1574 } 1575 if (tp->t_flags & TF_ECN_PERMIT) 1576 ti->tcpi_options |= TCPI_OPT_ECN; 1577 1578 ti->tcpi_rto = tp->t_rxtcur * tick; 1579 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1580 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1581 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1582 1583 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1584 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1585 1586 /* 1587 * FreeBSD-specific extension fields for tcp_info. 1588 */ 1589 ti->tcpi_rcv_space = tp->rcv_wnd; 1590 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1591 ti->tcpi_snd_wnd = tp->snd_wnd; 1592 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1593 ti->tcpi_snd_nxt = tp->snd_nxt; 1594 ti->tcpi_snd_mss = tp->t_maxseg; 1595 ti->tcpi_rcv_mss = tp->t_maxseg; 1596 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1597 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1598 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1599 #ifdef TCP_OFFLOAD 1600 if (tp->t_flags & TF_TOE) { 1601 ti->tcpi_options |= TCPI_OPT_TOE; 1602 tcp_offload_tcp_info(tp, ti); 1603 } 1604 #endif 1605 } 1606 1607 /* 1608 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1609 * socket option arguments. When it re-acquires the lock after the copy, it 1610 * has to revalidate that the connection is still valid for the socket 1611 * option. 1612 */ 1613 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1614 INP_WLOCK(inp); \ 1615 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1616 INP_WUNLOCK(inp); \ 1617 cleanup; \ 1618 return (ECONNRESET); \ 1619 } \ 1620 tp = intotcpcb(inp); \ 1621 } while(0) 1622 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1623 1624 int 1625 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1626 { 1627 int error; 1628 struct inpcb *inp; 1629 struct tcpcb *tp; 1630 struct tcp_function_block *blk; 1631 struct tcp_function_set fsn; 1632 1633 error = 0; 1634 inp = sotoinpcb(so); 1635 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1636 if (sopt->sopt_level != IPPROTO_TCP) { 1637 #ifdef INET6 1638 if (inp->inp_vflag & INP_IPV6PROTO) { 1639 error = ip6_ctloutput(so, sopt); 1640 /* 1641 * In case of the IPV6_USE_MIN_MTU socket option, 1642 * the INC_IPV6MINMTU flag to announce a corresponding 1643 * MSS during the initial handshake. 1644 * If the TCP connection is not in the front states, 1645 * just reduce the MSS being used. 1646 * This avoids the sending of TCP segments which will 1647 * be fragmented at the IPv6 layer. 1648 */ 1649 if ((error == 0) && 1650 (sopt->sopt_dir == SOPT_SET) && 1651 (sopt->sopt_level == IPPROTO_IPV6) && 1652 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1653 INP_WLOCK(inp); 1654 if ((inp->inp_flags & 1655 (INP_TIMEWAIT | INP_DROPPED))) { 1656 INP_WUNLOCK(inp); 1657 return (ECONNRESET); 1658 } 1659 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1660 tp = intotcpcb(inp); 1661 if ((tp->t_state >= TCPS_SYN_SENT) && 1662 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1663 struct ip6_pktopts *opt; 1664 1665 opt = inp->in6p_outputopts; 1666 if ((opt != NULL) && 1667 (opt->ip6po_minmtu == 1668 IP6PO_MINMTU_ALL)) { 1669 if (tp->t_maxseg > TCP6_MSS) { 1670 tp->t_maxseg = TCP6_MSS; 1671 } 1672 } 1673 } 1674 INP_WUNLOCK(inp); 1675 } 1676 } 1677 #endif /* INET6 */ 1678 #if defined(INET6) && defined(INET) 1679 else 1680 #endif 1681 #ifdef INET 1682 { 1683 error = ip_ctloutput(so, sopt); 1684 } 1685 #endif 1686 return (error); 1687 } 1688 INP_WLOCK(inp); 1689 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1690 INP_WUNLOCK(inp); 1691 return (ECONNRESET); 1692 } 1693 tp = intotcpcb(inp); 1694 /* 1695 * Protect the TCP option TCP_FUNCTION_BLK so 1696 * that a sub-function can *never* overwrite this. 1697 */ 1698 if ((sopt->sopt_dir == SOPT_SET) && 1699 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1700 INP_WUNLOCK(inp); 1701 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1702 sizeof fsn); 1703 if (error) 1704 return (error); 1705 INP_WLOCK_RECHECK(inp); 1706 blk = find_and_ref_tcp_functions(&fsn); 1707 if (blk == NULL) { 1708 INP_WUNLOCK(inp); 1709 return (ENOENT); 1710 } 1711 if (tp->t_fb == blk) { 1712 /* You already have this */ 1713 refcount_release(&blk->tfb_refcnt); 1714 INP_WUNLOCK(inp); 1715 return (0); 1716 } 1717 if (tp->t_state != TCPS_CLOSED) { 1718 /* 1719 * The user has advanced the state 1720 * past the initial point, we may not 1721 * be able to switch. 1722 */ 1723 if (blk->tfb_tcp_handoff_ok != NULL) { 1724 /* 1725 * Does the stack provide a 1726 * query mechanism, if so it may 1727 * still be possible? 1728 */ 1729 error = (*blk->tfb_tcp_handoff_ok)(tp); 1730 } else 1731 error = EINVAL; 1732 if (error) { 1733 refcount_release(&blk->tfb_refcnt); 1734 INP_WUNLOCK(inp); 1735 return(error); 1736 } 1737 } 1738 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1739 refcount_release(&blk->tfb_refcnt); 1740 INP_WUNLOCK(inp); 1741 return (ENOENT); 1742 } 1743 /* 1744 * Release the old refcnt, the 1745 * lookup acquired a ref on the 1746 * new one already. 1747 */ 1748 if (tp->t_fb->tfb_tcp_fb_fini) { 1749 /* 1750 * Tell the stack to cleanup with 0 i.e. 1751 * the tcb is not going away. 1752 */ 1753 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1754 } 1755 #ifdef TCPHPTS 1756 /* Assure that we are not on any hpts */ 1757 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1758 #endif 1759 if (blk->tfb_tcp_fb_init) { 1760 error = (*blk->tfb_tcp_fb_init)(tp); 1761 if (error) { 1762 refcount_release(&blk->tfb_refcnt); 1763 if (tp->t_fb->tfb_tcp_fb_init) { 1764 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1765 /* Fall back failed, drop the connection */ 1766 INP_WUNLOCK(inp); 1767 soabort(so); 1768 return(error); 1769 } 1770 } 1771 goto err_out; 1772 } 1773 } 1774 refcount_release(&tp->t_fb->tfb_refcnt); 1775 tp->t_fb = blk; 1776 #ifdef TCP_OFFLOAD 1777 if (tp->t_flags & TF_TOE) { 1778 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1779 sopt->sopt_name); 1780 } 1781 #endif 1782 err_out: 1783 INP_WUNLOCK(inp); 1784 return (error); 1785 } else if ((sopt->sopt_dir == SOPT_GET) && 1786 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1787 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1788 TCP_FUNCTION_NAME_LEN_MAX); 1789 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1790 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1791 INP_WUNLOCK(inp); 1792 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1793 return (error); 1794 } 1795 /* Pass in the INP locked, called must unlock it */ 1796 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1797 } 1798 1799 /* 1800 * If this assert becomes untrue, we need to change the size of the buf 1801 * variable in tcp_default_ctloutput(). 1802 */ 1803 #ifdef CTASSERT 1804 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1805 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1806 #endif 1807 1808 int 1809 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1810 { 1811 int error, opt, optval; 1812 u_int ui; 1813 struct tcp_info ti; 1814 #ifdef KERN_TLS 1815 struct tls_enable tls; 1816 #endif 1817 struct cc_algo *algo; 1818 char *pbuf, buf[TCP_LOG_ID_LEN]; 1819 size_t len; 1820 1821 /* 1822 * For TCP_CCALGOOPT forward the control to CC module, for both 1823 * SOPT_SET and SOPT_GET. 1824 */ 1825 switch (sopt->sopt_name) { 1826 case TCP_CCALGOOPT: 1827 INP_WUNLOCK(inp); 1828 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 1829 return (EINVAL); 1830 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1831 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1832 sopt->sopt_valsize); 1833 if (error) { 1834 free(pbuf, M_TEMP); 1835 return (error); 1836 } 1837 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1838 if (CC_ALGO(tp)->ctl_output != NULL) 1839 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1840 else 1841 error = ENOENT; 1842 INP_WUNLOCK(inp); 1843 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1844 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1845 free(pbuf, M_TEMP); 1846 return (error); 1847 } 1848 1849 switch (sopt->sopt_dir) { 1850 case SOPT_SET: 1851 switch (sopt->sopt_name) { 1852 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1853 case TCP_MD5SIG: 1854 if (!TCPMD5_ENABLED()) { 1855 INP_WUNLOCK(inp); 1856 return (ENOPROTOOPT); 1857 } 1858 error = TCPMD5_PCBCTL(inp, sopt); 1859 if (error) 1860 return (error); 1861 goto unlock_and_done; 1862 #endif /* IPSEC */ 1863 1864 case TCP_NODELAY: 1865 case TCP_NOOPT: 1866 INP_WUNLOCK(inp); 1867 error = sooptcopyin(sopt, &optval, sizeof optval, 1868 sizeof optval); 1869 if (error) 1870 return (error); 1871 1872 INP_WLOCK_RECHECK(inp); 1873 switch (sopt->sopt_name) { 1874 case TCP_NODELAY: 1875 opt = TF_NODELAY; 1876 break; 1877 case TCP_NOOPT: 1878 opt = TF_NOOPT; 1879 break; 1880 default: 1881 opt = 0; /* dead code to fool gcc */ 1882 break; 1883 } 1884 1885 if (optval) 1886 tp->t_flags |= opt; 1887 else 1888 tp->t_flags &= ~opt; 1889 unlock_and_done: 1890 #ifdef TCP_OFFLOAD 1891 if (tp->t_flags & TF_TOE) { 1892 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1893 sopt->sopt_name); 1894 } 1895 #endif 1896 INP_WUNLOCK(inp); 1897 break; 1898 1899 case TCP_NOPUSH: 1900 INP_WUNLOCK(inp); 1901 error = sooptcopyin(sopt, &optval, sizeof optval, 1902 sizeof optval); 1903 if (error) 1904 return (error); 1905 1906 INP_WLOCK_RECHECK(inp); 1907 if (optval) 1908 tp->t_flags |= TF_NOPUSH; 1909 else if (tp->t_flags & TF_NOPUSH) { 1910 tp->t_flags &= ~TF_NOPUSH; 1911 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1912 error = tp->t_fb->tfb_tcp_output(tp); 1913 } 1914 goto unlock_and_done; 1915 1916 case TCP_MAXSEG: 1917 INP_WUNLOCK(inp); 1918 error = sooptcopyin(sopt, &optval, sizeof optval, 1919 sizeof optval); 1920 if (error) 1921 return (error); 1922 1923 INP_WLOCK_RECHECK(inp); 1924 if (optval > 0 && optval <= tp->t_maxseg && 1925 optval + 40 >= V_tcp_minmss) 1926 tp->t_maxseg = optval; 1927 else 1928 error = EINVAL; 1929 goto unlock_and_done; 1930 1931 case TCP_INFO: 1932 INP_WUNLOCK(inp); 1933 error = EINVAL; 1934 break; 1935 1936 case TCP_CONGESTION: 1937 INP_WUNLOCK(inp); 1938 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1939 if (error) 1940 break; 1941 buf[sopt->sopt_valsize] = '\0'; 1942 INP_WLOCK_RECHECK(inp); 1943 CC_LIST_RLOCK(); 1944 STAILQ_FOREACH(algo, &cc_list, entries) 1945 if (strncmp(buf, algo->name, 1946 TCP_CA_NAME_MAX) == 0) 1947 break; 1948 CC_LIST_RUNLOCK(); 1949 if (algo == NULL) { 1950 INP_WUNLOCK(inp); 1951 error = EINVAL; 1952 break; 1953 } 1954 /* 1955 * We hold a write lock over the tcb so it's safe to 1956 * do these things without ordering concerns. 1957 */ 1958 if (CC_ALGO(tp)->cb_destroy != NULL) 1959 CC_ALGO(tp)->cb_destroy(tp->ccv); 1960 CC_DATA(tp) = NULL; 1961 CC_ALGO(tp) = algo; 1962 /* 1963 * If something goes pear shaped initialising the new 1964 * algo, fall back to newreno (which does not 1965 * require initialisation). 1966 */ 1967 if (algo->cb_init != NULL && 1968 algo->cb_init(tp->ccv) != 0) { 1969 CC_ALGO(tp) = &newreno_cc_algo; 1970 /* 1971 * The only reason init should fail is 1972 * because of malloc. 1973 */ 1974 error = ENOMEM; 1975 } 1976 INP_WUNLOCK(inp); 1977 break; 1978 1979 #ifdef KERN_TLS 1980 case TCP_TXTLS_ENABLE: 1981 INP_WUNLOCK(inp); 1982 error = sooptcopyin(sopt, &tls, sizeof(tls), 1983 sizeof(tls)); 1984 if (error) 1985 break; 1986 error = ktls_enable_tx(so, &tls); 1987 break; 1988 case TCP_TXTLS_MODE: 1989 INP_WUNLOCK(inp); 1990 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1991 if (error) 1992 return (error); 1993 1994 INP_WLOCK_RECHECK(inp); 1995 error = ktls_set_tx_mode(so, ui); 1996 INP_WUNLOCK(inp); 1997 break; 1998 #endif 1999 2000 case TCP_KEEPIDLE: 2001 case TCP_KEEPINTVL: 2002 case TCP_KEEPINIT: 2003 INP_WUNLOCK(inp); 2004 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2005 if (error) 2006 return (error); 2007 2008 if (ui > (UINT_MAX / hz)) { 2009 error = EINVAL; 2010 break; 2011 } 2012 ui *= hz; 2013 2014 INP_WLOCK_RECHECK(inp); 2015 switch (sopt->sopt_name) { 2016 case TCP_KEEPIDLE: 2017 tp->t_keepidle = ui; 2018 /* 2019 * XXX: better check current remaining 2020 * timeout and "merge" it with new value. 2021 */ 2022 if ((tp->t_state > TCPS_LISTEN) && 2023 (tp->t_state <= TCPS_CLOSING)) 2024 tcp_timer_activate(tp, TT_KEEP, 2025 TP_KEEPIDLE(tp)); 2026 break; 2027 case TCP_KEEPINTVL: 2028 tp->t_keepintvl = ui; 2029 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2030 (TP_MAXIDLE(tp) > 0)) 2031 tcp_timer_activate(tp, TT_2MSL, 2032 TP_MAXIDLE(tp)); 2033 break; 2034 case TCP_KEEPINIT: 2035 tp->t_keepinit = ui; 2036 if (tp->t_state == TCPS_SYN_RECEIVED || 2037 tp->t_state == TCPS_SYN_SENT) 2038 tcp_timer_activate(tp, TT_KEEP, 2039 TP_KEEPINIT(tp)); 2040 break; 2041 } 2042 goto unlock_and_done; 2043 2044 case TCP_KEEPCNT: 2045 INP_WUNLOCK(inp); 2046 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2047 if (error) 2048 return (error); 2049 2050 INP_WLOCK_RECHECK(inp); 2051 tp->t_keepcnt = ui; 2052 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2053 (TP_MAXIDLE(tp) > 0)) 2054 tcp_timer_activate(tp, TT_2MSL, 2055 TP_MAXIDLE(tp)); 2056 goto unlock_and_done; 2057 2058 #ifdef TCPPCAP 2059 case TCP_PCAP_OUT: 2060 case TCP_PCAP_IN: 2061 INP_WUNLOCK(inp); 2062 error = sooptcopyin(sopt, &optval, sizeof optval, 2063 sizeof optval); 2064 if (error) 2065 return (error); 2066 2067 INP_WLOCK_RECHECK(inp); 2068 if (optval >= 0) 2069 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 2070 &(tp->t_outpkts) : &(tp->t_inpkts), 2071 optval); 2072 else 2073 error = EINVAL; 2074 goto unlock_and_done; 2075 #endif 2076 2077 case TCP_FASTOPEN: { 2078 struct tcp_fastopen tfo_optval; 2079 2080 INP_WUNLOCK(inp); 2081 if (!V_tcp_fastopen_client_enable && 2082 !V_tcp_fastopen_server_enable) 2083 return (EPERM); 2084 2085 error = sooptcopyin(sopt, &tfo_optval, 2086 sizeof(tfo_optval), sizeof(int)); 2087 if (error) 2088 return (error); 2089 2090 INP_WLOCK_RECHECK(inp); 2091 if (tfo_optval.enable) { 2092 if (tp->t_state == TCPS_LISTEN) { 2093 if (!V_tcp_fastopen_server_enable) { 2094 error = EPERM; 2095 goto unlock_and_done; 2096 } 2097 2098 tp->t_flags |= TF_FASTOPEN; 2099 if (tp->t_tfo_pending == NULL) 2100 tp->t_tfo_pending = 2101 tcp_fastopen_alloc_counter(); 2102 } else { 2103 /* 2104 * If a pre-shared key was provided, 2105 * stash it in the client cookie 2106 * field of the tcpcb for use during 2107 * connect. 2108 */ 2109 if (sopt->sopt_valsize == 2110 sizeof(tfo_optval)) { 2111 memcpy(tp->t_tfo_cookie.client, 2112 tfo_optval.psk, 2113 TCP_FASTOPEN_PSK_LEN); 2114 tp->t_tfo_client_cookie_len = 2115 TCP_FASTOPEN_PSK_LEN; 2116 } 2117 tp->t_flags |= TF_FASTOPEN; 2118 } 2119 } else 2120 tp->t_flags &= ~TF_FASTOPEN; 2121 goto unlock_and_done; 2122 } 2123 2124 #ifdef TCP_BLACKBOX 2125 case TCP_LOG: 2126 INP_WUNLOCK(inp); 2127 error = sooptcopyin(sopt, &optval, sizeof optval, 2128 sizeof optval); 2129 if (error) 2130 return (error); 2131 2132 INP_WLOCK_RECHECK(inp); 2133 error = tcp_log_state_change(tp, optval); 2134 goto unlock_and_done; 2135 2136 case TCP_LOGBUF: 2137 INP_WUNLOCK(inp); 2138 error = EINVAL; 2139 break; 2140 2141 case TCP_LOGID: 2142 INP_WUNLOCK(inp); 2143 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2144 if (error) 2145 break; 2146 buf[sopt->sopt_valsize] = '\0'; 2147 INP_WLOCK_RECHECK(inp); 2148 error = tcp_log_set_id(tp, buf); 2149 /* tcp_log_set_id() unlocks the INP. */ 2150 break; 2151 2152 case TCP_LOGDUMP: 2153 case TCP_LOGDUMPID: 2154 INP_WUNLOCK(inp); 2155 error = 2156 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2157 if (error) 2158 break; 2159 buf[sopt->sopt_valsize] = '\0'; 2160 INP_WLOCK_RECHECK(inp); 2161 if (sopt->sopt_name == TCP_LOGDUMP) { 2162 error = tcp_log_dump_tp_logbuf(tp, buf, 2163 M_WAITOK, true); 2164 INP_WUNLOCK(inp); 2165 } else { 2166 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2167 /* 2168 * tcp_log_dump_tp_bucket_logbufs() drops the 2169 * INP lock. 2170 */ 2171 } 2172 break; 2173 #endif 2174 2175 default: 2176 INP_WUNLOCK(inp); 2177 error = ENOPROTOOPT; 2178 break; 2179 } 2180 break; 2181 2182 case SOPT_GET: 2183 tp = intotcpcb(inp); 2184 switch (sopt->sopt_name) { 2185 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2186 case TCP_MD5SIG: 2187 if (!TCPMD5_ENABLED()) { 2188 INP_WUNLOCK(inp); 2189 return (ENOPROTOOPT); 2190 } 2191 error = TCPMD5_PCBCTL(inp, sopt); 2192 break; 2193 #endif 2194 2195 case TCP_NODELAY: 2196 optval = tp->t_flags & TF_NODELAY; 2197 INP_WUNLOCK(inp); 2198 error = sooptcopyout(sopt, &optval, sizeof optval); 2199 break; 2200 case TCP_MAXSEG: 2201 optval = tp->t_maxseg; 2202 INP_WUNLOCK(inp); 2203 error = sooptcopyout(sopt, &optval, sizeof optval); 2204 break; 2205 case TCP_NOOPT: 2206 optval = tp->t_flags & TF_NOOPT; 2207 INP_WUNLOCK(inp); 2208 error = sooptcopyout(sopt, &optval, sizeof optval); 2209 break; 2210 case TCP_NOPUSH: 2211 optval = tp->t_flags & TF_NOPUSH; 2212 INP_WUNLOCK(inp); 2213 error = sooptcopyout(sopt, &optval, sizeof optval); 2214 break; 2215 case TCP_INFO: 2216 tcp_fill_info(tp, &ti); 2217 INP_WUNLOCK(inp); 2218 error = sooptcopyout(sopt, &ti, sizeof ti); 2219 break; 2220 case TCP_CONGESTION: 2221 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2222 INP_WUNLOCK(inp); 2223 error = sooptcopyout(sopt, buf, len + 1); 2224 break; 2225 case TCP_KEEPIDLE: 2226 case TCP_KEEPINTVL: 2227 case TCP_KEEPINIT: 2228 case TCP_KEEPCNT: 2229 switch (sopt->sopt_name) { 2230 case TCP_KEEPIDLE: 2231 ui = TP_KEEPIDLE(tp) / hz; 2232 break; 2233 case TCP_KEEPINTVL: 2234 ui = TP_KEEPINTVL(tp) / hz; 2235 break; 2236 case TCP_KEEPINIT: 2237 ui = TP_KEEPINIT(tp) / hz; 2238 break; 2239 case TCP_KEEPCNT: 2240 ui = TP_KEEPCNT(tp); 2241 break; 2242 } 2243 INP_WUNLOCK(inp); 2244 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2245 break; 2246 #ifdef TCPPCAP 2247 case TCP_PCAP_OUT: 2248 case TCP_PCAP_IN: 2249 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2250 &(tp->t_outpkts) : &(tp->t_inpkts)); 2251 INP_WUNLOCK(inp); 2252 error = sooptcopyout(sopt, &optval, sizeof optval); 2253 break; 2254 #endif 2255 case TCP_FASTOPEN: 2256 optval = tp->t_flags & TF_FASTOPEN; 2257 INP_WUNLOCK(inp); 2258 error = sooptcopyout(sopt, &optval, sizeof optval); 2259 break; 2260 #ifdef TCP_BLACKBOX 2261 case TCP_LOG: 2262 optval = tp->t_logstate; 2263 INP_WUNLOCK(inp); 2264 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2265 break; 2266 case TCP_LOGBUF: 2267 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2268 error = tcp_log_getlogbuf(sopt, tp); 2269 break; 2270 case TCP_LOGID: 2271 len = tcp_log_get_id(tp, buf); 2272 INP_WUNLOCK(inp); 2273 error = sooptcopyout(sopt, buf, len + 1); 2274 break; 2275 case TCP_LOGDUMP: 2276 case TCP_LOGDUMPID: 2277 INP_WUNLOCK(inp); 2278 error = EINVAL; 2279 break; 2280 #endif 2281 #ifdef KERN_TLS 2282 case TCP_TXTLS_MODE: 2283 optval = ktls_get_tx_mode(so); 2284 INP_WUNLOCK(inp); 2285 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2286 break; 2287 #endif 2288 default: 2289 INP_WUNLOCK(inp); 2290 error = ENOPROTOOPT; 2291 break; 2292 } 2293 break; 2294 } 2295 return (error); 2296 } 2297 #undef INP_WLOCK_RECHECK 2298 #undef INP_WLOCK_RECHECK_CLEANUP 2299 2300 /* 2301 * Attach TCP protocol to socket, allocating 2302 * internet protocol control block, tcp control block, 2303 * bufer space, and entering LISTEN state if to accept connections. 2304 */ 2305 static int 2306 tcp_attach(struct socket *so) 2307 { 2308 struct tcpcb *tp; 2309 struct inpcb *inp; 2310 struct epoch_tracker et; 2311 int error; 2312 2313 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 2314 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 2315 if (error) 2316 return (error); 2317 } 2318 so->so_rcv.sb_flags |= SB_AUTOSIZE; 2319 so->so_snd.sb_flags |= SB_AUTOSIZE; 2320 NET_EPOCH_ENTER(et); 2321 error = in_pcballoc(so, &V_tcbinfo); 2322 if (error) { 2323 NET_EPOCH_EXIT(et); 2324 return (error); 2325 } 2326 inp = sotoinpcb(so); 2327 #ifdef INET6 2328 if (inp->inp_vflag & INP_IPV6PROTO) { 2329 inp->inp_vflag |= INP_IPV6; 2330 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 2331 inp->inp_vflag |= INP_IPV4; 2332 inp->in6p_hops = -1; /* use kernel default */ 2333 } 2334 else 2335 #endif 2336 inp->inp_vflag |= INP_IPV4; 2337 tp = tcp_newtcpcb(inp); 2338 if (tp == NULL) { 2339 in_pcbdetach(inp); 2340 in_pcbfree(inp); 2341 NET_EPOCH_EXIT(et); 2342 return (ENOBUFS); 2343 } 2344 tp->t_state = TCPS_CLOSED; 2345 INP_WUNLOCK(inp); 2346 NET_EPOCH_EXIT(et); 2347 TCPSTATES_INC(TCPS_CLOSED); 2348 return (0); 2349 } 2350 2351 /* 2352 * Initiate (or continue) disconnect. 2353 * If embryonic state, just send reset (once). 2354 * If in ``let data drain'' option and linger null, just drop. 2355 * Otherwise (hard), mark socket disconnecting and drop 2356 * current input data; switch states based on user close, and 2357 * send segment to peer (with FIN). 2358 */ 2359 static void 2360 tcp_disconnect(struct tcpcb *tp) 2361 { 2362 struct inpcb *inp = tp->t_inpcb; 2363 struct socket *so = inp->inp_socket; 2364 2365 NET_EPOCH_ASSERT(); 2366 INP_WLOCK_ASSERT(inp); 2367 2368 /* 2369 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2370 * socket is still open. 2371 */ 2372 if (tp->t_state < TCPS_ESTABLISHED && 2373 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2374 tp = tcp_close(tp); 2375 KASSERT(tp != NULL, 2376 ("tcp_disconnect: tcp_close() returned NULL")); 2377 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2378 tp = tcp_drop(tp, 0); 2379 KASSERT(tp != NULL, 2380 ("tcp_disconnect: tcp_drop() returned NULL")); 2381 } else { 2382 soisdisconnecting(so); 2383 sbflush(&so->so_rcv); 2384 tcp_usrclosed(tp); 2385 if (!(inp->inp_flags & INP_DROPPED)) 2386 tp->t_fb->tfb_tcp_output(tp); 2387 } 2388 } 2389 2390 /* 2391 * User issued close, and wish to trail through shutdown states: 2392 * if never received SYN, just forget it. If got a SYN from peer, 2393 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2394 * If already got a FIN from peer, then almost done; go to LAST_ACK 2395 * state. In all other cases, have already sent FIN to peer (e.g. 2396 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2397 * for peer to send FIN or not respond to keep-alives, etc. 2398 * We can let the user exit from the close as soon as the FIN is acked. 2399 */ 2400 static void 2401 tcp_usrclosed(struct tcpcb *tp) 2402 { 2403 2404 NET_EPOCH_ASSERT(); 2405 INP_WLOCK_ASSERT(tp->t_inpcb); 2406 2407 switch (tp->t_state) { 2408 case TCPS_LISTEN: 2409 #ifdef TCP_OFFLOAD 2410 tcp_offload_listen_stop(tp); 2411 #endif 2412 tcp_state_change(tp, TCPS_CLOSED); 2413 /* FALLTHROUGH */ 2414 case TCPS_CLOSED: 2415 tp = tcp_close(tp); 2416 /* 2417 * tcp_close() should never return NULL here as the socket is 2418 * still open. 2419 */ 2420 KASSERT(tp != NULL, 2421 ("tcp_usrclosed: tcp_close() returned NULL")); 2422 break; 2423 2424 case TCPS_SYN_SENT: 2425 case TCPS_SYN_RECEIVED: 2426 tp->t_flags |= TF_NEEDFIN; 2427 break; 2428 2429 case TCPS_ESTABLISHED: 2430 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2431 break; 2432 2433 case TCPS_CLOSE_WAIT: 2434 tcp_state_change(tp, TCPS_LAST_ACK); 2435 break; 2436 } 2437 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2438 soisdisconnected(tp->t_inpcb->inp_socket); 2439 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2440 if (tp->t_state == TCPS_FIN_WAIT_2) { 2441 int timeout; 2442 2443 timeout = (tcp_fast_finwait2_recycle) ? 2444 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2445 tcp_timer_activate(tp, TT_2MSL, timeout); 2446 } 2447 } 2448 } 2449 2450 #ifdef DDB 2451 static void 2452 db_print_indent(int indent) 2453 { 2454 int i; 2455 2456 for (i = 0; i < indent; i++) 2457 db_printf(" "); 2458 } 2459 2460 static void 2461 db_print_tstate(int t_state) 2462 { 2463 2464 switch (t_state) { 2465 case TCPS_CLOSED: 2466 db_printf("TCPS_CLOSED"); 2467 return; 2468 2469 case TCPS_LISTEN: 2470 db_printf("TCPS_LISTEN"); 2471 return; 2472 2473 case TCPS_SYN_SENT: 2474 db_printf("TCPS_SYN_SENT"); 2475 return; 2476 2477 case TCPS_SYN_RECEIVED: 2478 db_printf("TCPS_SYN_RECEIVED"); 2479 return; 2480 2481 case TCPS_ESTABLISHED: 2482 db_printf("TCPS_ESTABLISHED"); 2483 return; 2484 2485 case TCPS_CLOSE_WAIT: 2486 db_printf("TCPS_CLOSE_WAIT"); 2487 return; 2488 2489 case TCPS_FIN_WAIT_1: 2490 db_printf("TCPS_FIN_WAIT_1"); 2491 return; 2492 2493 case TCPS_CLOSING: 2494 db_printf("TCPS_CLOSING"); 2495 return; 2496 2497 case TCPS_LAST_ACK: 2498 db_printf("TCPS_LAST_ACK"); 2499 return; 2500 2501 case TCPS_FIN_WAIT_2: 2502 db_printf("TCPS_FIN_WAIT_2"); 2503 return; 2504 2505 case TCPS_TIME_WAIT: 2506 db_printf("TCPS_TIME_WAIT"); 2507 return; 2508 2509 default: 2510 db_printf("unknown"); 2511 return; 2512 } 2513 } 2514 2515 static void 2516 db_print_tflags(u_int t_flags) 2517 { 2518 int comma; 2519 2520 comma = 0; 2521 if (t_flags & TF_ACKNOW) { 2522 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2523 comma = 1; 2524 } 2525 if (t_flags & TF_DELACK) { 2526 db_printf("%sTF_DELACK", comma ? ", " : ""); 2527 comma = 1; 2528 } 2529 if (t_flags & TF_NODELAY) { 2530 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2531 comma = 1; 2532 } 2533 if (t_flags & TF_NOOPT) { 2534 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2535 comma = 1; 2536 } 2537 if (t_flags & TF_SENTFIN) { 2538 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2539 comma = 1; 2540 } 2541 if (t_flags & TF_REQ_SCALE) { 2542 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2543 comma = 1; 2544 } 2545 if (t_flags & TF_RCVD_SCALE) { 2546 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2547 comma = 1; 2548 } 2549 if (t_flags & TF_REQ_TSTMP) { 2550 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2551 comma = 1; 2552 } 2553 if (t_flags & TF_RCVD_TSTMP) { 2554 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2555 comma = 1; 2556 } 2557 if (t_flags & TF_SACK_PERMIT) { 2558 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2559 comma = 1; 2560 } 2561 if (t_flags & TF_NEEDSYN) { 2562 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2563 comma = 1; 2564 } 2565 if (t_flags & TF_NEEDFIN) { 2566 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2567 comma = 1; 2568 } 2569 if (t_flags & TF_NOPUSH) { 2570 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2571 comma = 1; 2572 } 2573 if (t_flags & TF_MORETOCOME) { 2574 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2575 comma = 1; 2576 } 2577 if (t_flags & TF_LQ_OVERFLOW) { 2578 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2579 comma = 1; 2580 } 2581 if (t_flags & TF_LASTIDLE) { 2582 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2583 comma = 1; 2584 } 2585 if (t_flags & TF_RXWIN0SENT) { 2586 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2587 comma = 1; 2588 } 2589 if (t_flags & TF_FASTRECOVERY) { 2590 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2591 comma = 1; 2592 } 2593 if (t_flags & TF_CONGRECOVERY) { 2594 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2595 comma = 1; 2596 } 2597 if (t_flags & TF_WASFRECOVERY) { 2598 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2599 comma = 1; 2600 } 2601 if (t_flags & TF_SIGNATURE) { 2602 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2603 comma = 1; 2604 } 2605 if (t_flags & TF_FORCEDATA) { 2606 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2607 comma = 1; 2608 } 2609 if (t_flags & TF_TSO) { 2610 db_printf("%sTF_TSO", comma ? ", " : ""); 2611 comma = 1; 2612 } 2613 if (t_flags & TF_ECN_PERMIT) { 2614 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2615 comma = 1; 2616 } 2617 if (t_flags & TF_FASTOPEN) { 2618 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2619 comma = 1; 2620 } 2621 } 2622 2623 static void 2624 db_print_toobflags(char t_oobflags) 2625 { 2626 int comma; 2627 2628 comma = 0; 2629 if (t_oobflags & TCPOOB_HAVEDATA) { 2630 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2631 comma = 1; 2632 } 2633 if (t_oobflags & TCPOOB_HADDATA) { 2634 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2635 comma = 1; 2636 } 2637 } 2638 2639 static void 2640 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2641 { 2642 2643 db_print_indent(indent); 2644 db_printf("%s at %p\n", name, tp); 2645 2646 indent += 2; 2647 2648 db_print_indent(indent); 2649 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2650 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2651 2652 db_print_indent(indent); 2653 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2654 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2655 2656 db_print_indent(indent); 2657 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2658 &tp->t_timers->tt_delack, tp->t_inpcb); 2659 2660 db_print_indent(indent); 2661 db_printf("t_state: %d (", tp->t_state); 2662 db_print_tstate(tp->t_state); 2663 db_printf(")\n"); 2664 2665 db_print_indent(indent); 2666 db_printf("t_flags: 0x%x (", tp->t_flags); 2667 db_print_tflags(tp->t_flags); 2668 db_printf(")\n"); 2669 2670 db_print_indent(indent); 2671 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2672 tp->snd_una, tp->snd_max, tp->snd_nxt); 2673 2674 db_print_indent(indent); 2675 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2676 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2677 2678 db_print_indent(indent); 2679 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2680 tp->iss, tp->irs, tp->rcv_nxt); 2681 2682 db_print_indent(indent); 2683 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2684 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2685 2686 db_print_indent(indent); 2687 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2688 tp->snd_wnd, tp->snd_cwnd); 2689 2690 db_print_indent(indent); 2691 db_printf("snd_ssthresh: %u snd_recover: " 2692 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2693 2694 db_print_indent(indent); 2695 db_printf("t_rcvtime: %u t_startime: %u\n", 2696 tp->t_rcvtime, tp->t_starttime); 2697 2698 db_print_indent(indent); 2699 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2700 tp->t_rtttime, tp->t_rtseq); 2701 2702 db_print_indent(indent); 2703 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2704 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2705 2706 db_print_indent(indent); 2707 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2708 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2709 tp->t_rttbest); 2710 2711 db_print_indent(indent); 2712 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2713 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2714 2715 db_print_indent(indent); 2716 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2717 db_print_toobflags(tp->t_oobflags); 2718 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2719 2720 db_print_indent(indent); 2721 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2722 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2723 2724 db_print_indent(indent); 2725 db_printf("ts_recent: %u ts_recent_age: %u\n", 2726 tp->ts_recent, tp->ts_recent_age); 2727 2728 db_print_indent(indent); 2729 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2730 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2731 2732 db_print_indent(indent); 2733 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2734 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2735 tp->snd_recover_prev, tp->t_badrxtwin); 2736 2737 db_print_indent(indent); 2738 db_printf("snd_numholes: %d snd_holes first: %p\n", 2739 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2740 2741 db_print_indent(indent); 2742 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2743 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2744 2745 /* Skip sackblks, sackhint. */ 2746 2747 db_print_indent(indent); 2748 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2749 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2750 } 2751 2752 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2753 { 2754 struct tcpcb *tp; 2755 2756 if (!have_addr) { 2757 db_printf("usage: show tcpcb <addr>\n"); 2758 return; 2759 } 2760 tp = (struct tcpcb *)addr; 2761 2762 db_print_tcpcb(tp, "tcpcb", 0); 2763 } 2764 #endif 2765