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sys/netinet/tcp_usrreq.c
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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: releng/12.0/sys/netinet/tcp_usrreq.c 338291 2018-08-24 10:50:19Z tuexen $"); 42 43 #include "opt_ddb.h" 44 #include "opt_inet.h" 45 #include "opt_inet6.h" 46 #include "opt_ipsec.h" 47 #include "opt_tcpdebug.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/limits.h> 52 #include <sys/malloc.h> 53 #include <sys/refcount.h> 54 #include <sys/kernel.h> 55 #include <sys/sysctl.h> 56 #include <sys/mbuf.h> 57 #ifdef INET6 58 #include <sys/domain.h> 59 #endif /* INET6 */ 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/protosw.h> 63 #include <sys/proc.h> 64 #include <sys/jail.h> 65 #include <sys/syslog.h> 66 67 #ifdef DDB 68 #include <ddb/ddb.h> 69 #endif 70 71 #include <net/if.h> 72 #include <net/if_var.h> 73 #include <net/route.h> 74 #include <net/vnet.h> 75 76 #include <netinet/in.h> 77 #include <netinet/in_kdtrace.h> 78 #include <netinet/in_pcb.h> 79 #include <netinet/in_systm.h> 80 #include <netinet/in_var.h> 81 #include <netinet/ip_var.h> 82 #ifdef INET6 83 #include <netinet/ip6.h> 84 #include <netinet6/in6_pcb.h> 85 #include <netinet6/ip6_var.h> 86 #include <netinet6/scope6_var.h> 87 #endif 88 #include <netinet/tcp.h> 89 #include <netinet/tcp_fsm.h> 90 #include <netinet/tcp_seq.h> 91 #include <netinet/tcp_timer.h> 92 #include <netinet/tcp_var.h> 93 #include <netinet/tcp_log_buf.h> 94 #include <netinet/tcpip.h> 95 #include <netinet/cc/cc.h> 96 #include <netinet/tcp_fastopen.h> 97 #include <netinet/tcp_hpts.h> 98 #ifdef TCPPCAP 99 #include <netinet/tcp_pcap.h> 100 #endif 101 #ifdef TCPDEBUG 102 #include <netinet/tcp_debug.h> 103 #endif 104 #ifdef TCP_OFFLOAD 105 #include <netinet/tcp_offload.h> 106 #endif 107 #include <netipsec/ipsec_support.h> 108 109 /* 110 * TCP protocol interface to socket abstraction. 111 */ 112 static int tcp_attach(struct socket *); 113 #ifdef INET 114 static int tcp_connect(struct tcpcb *, struct sockaddr *, 115 struct thread *td); 116 #endif /* INET */ 117 #ifdef INET6 118 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 119 struct thread *td); 120 #endif /* INET6 */ 121 static void tcp_disconnect(struct tcpcb *); 122 static void tcp_usrclosed(struct tcpcb *); 123 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 124 125 #ifdef TCPDEBUG 126 #define TCPDEBUG0 int ostate = 0 127 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 128 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 129 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 130 #else 131 #define TCPDEBUG0 132 #define TCPDEBUG1() 133 #define TCPDEBUG2(req) 134 #endif 135 136 /* 137 * TCP attaches to socket via pru_attach(), reserving space, 138 * and an internet control block. 139 */ 140 static int 141 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 142 { 143 struct inpcb *inp; 144 struct tcpcb *tp = NULL; 145 int error; 146 TCPDEBUG0; 147 148 inp = sotoinpcb(so); 149 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 150 TCPDEBUG1(); 151 152 error = tcp_attach(so); 153 if (error) 154 goto out; 155 156 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 157 so->so_linger = TCP_LINGERTIME; 158 159 inp = sotoinpcb(so); 160 tp = intotcpcb(inp); 161 out: 162 TCPDEBUG2(PRU_ATTACH); 163 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 164 return error; 165 } 166 167 /* 168 * tcp_detach is called when the socket layer loses its final reference 169 * to the socket, be it a file descriptor reference, a reference from TCP, 170 * etc. At this point, there is only one case in which we will keep around 171 * inpcb state: time wait. 172 * 173 * This function can probably be re-absorbed back into tcp_usr_detach() now 174 * that there is a single detach path. 175 */ 176 static void 177 tcp_detach(struct socket *so, struct inpcb *inp) 178 { 179 struct tcpcb *tp; 180 181 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 182 INP_WLOCK_ASSERT(inp); 183 184 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 185 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 186 187 tp = intotcpcb(inp); 188 189 if (inp->inp_flags & INP_TIMEWAIT) { 190 /* 191 * There are two cases to handle: one in which the time wait 192 * state is being discarded (INP_DROPPED), and one in which 193 * this connection will remain in timewait. In the former, 194 * it is time to discard all state (except tcptw, which has 195 * already been discarded by the timewait close code, which 196 * should be further up the call stack somewhere). In the 197 * latter case, we detach from the socket, but leave the pcb 198 * present until timewait ends. 199 * 200 * XXXRW: Would it be cleaner to free the tcptw here? 201 * 202 * Astute question indeed, from twtcp perspective there are 203 * four cases to consider: 204 * 205 * #1 tcp_detach is called at tcptw creation time by 206 * tcp_twstart, then do not discard the newly created tcptw 207 * and leave inpcb present until timewait ends 208 * #2 tcp_detach is called at tcptw creation time by 209 * tcp_twstart, but connection is local and tw will be 210 * discarded immediately 211 * #3 tcp_detach is called at timewait end (or reuse) by 212 * tcp_twclose, then the tcptw has already been discarded 213 * (or reused) and inpcb is freed here 214 * #4 tcp_detach is called() after timewait ends (or reuse) 215 * (e.g. by soclose), then tcptw has already been discarded 216 * (or reused) and inpcb is freed here 217 * 218 * In all three cases the tcptw should not be freed here. 219 */ 220 if (inp->inp_flags & INP_DROPPED) { 221 in_pcbdetach(inp); 222 if (__predict_true(tp == NULL)) { 223 in_pcbfree(inp); 224 } else { 225 /* 226 * This case should not happen as in TIMEWAIT 227 * state the inp should not be destroyed before 228 * its tcptw. If INVARIANTS is defined, panic. 229 */ 230 #ifdef INVARIANTS 231 panic("%s: Panic before an inp double-free: " 232 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 233 , __func__); 234 #else 235 log(LOG_ERR, "%s: Avoid an inp double-free: " 236 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 237 , __func__); 238 #endif 239 INP_WUNLOCK(inp); 240 } 241 } else { 242 in_pcbdetach(inp); 243 INP_WUNLOCK(inp); 244 } 245 } else { 246 /* 247 * If the connection is not in timewait, we consider two 248 * two conditions: one in which no further processing is 249 * necessary (dropped || embryonic), and one in which TCP is 250 * not yet done, but no longer requires the socket, so the 251 * pcb will persist for the time being. 252 * 253 * XXXRW: Does the second case still occur? 254 */ 255 if (inp->inp_flags & INP_DROPPED || 256 tp->t_state < TCPS_SYN_SENT) { 257 tcp_discardcb(tp); 258 in_pcbdetach(inp); 259 in_pcbfree(inp); 260 } else { 261 in_pcbdetach(inp); 262 INP_WUNLOCK(inp); 263 } 264 } 265 } 266 267 /* 268 * pru_detach() detaches the TCP protocol from the socket. 269 * If the protocol state is non-embryonic, then can't 270 * do this directly: have to initiate a pru_disconnect(), 271 * which may finish later; embryonic TCB's can just 272 * be discarded here. 273 */ 274 static void 275 tcp_usr_detach(struct socket *so) 276 { 277 struct inpcb *inp; 278 int rlock = 0; 279 struct epoch_tracker et; 280 281 inp = sotoinpcb(so); 282 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 283 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 284 INP_INFO_RLOCK_ET(&V_tcbinfo, et); 285 rlock = 1; 286 } 287 INP_WLOCK(inp); 288 KASSERT(inp->inp_socket != NULL, 289 ("tcp_usr_detach: inp_socket == NULL")); 290 tcp_detach(so, inp); 291 if (rlock) 292 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 293 } 294 295 #ifdef INET 296 /* 297 * Give the socket an address. 298 */ 299 static int 300 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 301 { 302 int error = 0; 303 struct inpcb *inp; 304 struct tcpcb *tp = NULL; 305 struct sockaddr_in *sinp; 306 307 sinp = (struct sockaddr_in *)nam; 308 if (nam->sa_len != sizeof (*sinp)) 309 return (EINVAL); 310 /* 311 * Must check for multicast addresses and disallow binding 312 * to them. 313 */ 314 if (sinp->sin_family == AF_INET && 315 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 316 return (EAFNOSUPPORT); 317 318 TCPDEBUG0; 319 inp = sotoinpcb(so); 320 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 321 INP_WLOCK(inp); 322 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 323 error = EINVAL; 324 goto out; 325 } 326 tp = intotcpcb(inp); 327 TCPDEBUG1(); 328 INP_HASH_WLOCK(&V_tcbinfo); 329 error = in_pcbbind(inp, nam, td->td_ucred); 330 INP_HASH_WUNLOCK(&V_tcbinfo); 331 out: 332 TCPDEBUG2(PRU_BIND); 333 TCP_PROBE2(debug__user, tp, PRU_BIND); 334 INP_WUNLOCK(inp); 335 336 return (error); 337 } 338 #endif /* INET */ 339 340 #ifdef INET6 341 static int 342 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 343 { 344 int error = 0; 345 struct inpcb *inp; 346 struct tcpcb *tp = NULL; 347 struct sockaddr_in6 *sin6p; 348 349 sin6p = (struct sockaddr_in6 *)nam; 350 if (nam->sa_len != sizeof (*sin6p)) 351 return (EINVAL); 352 /* 353 * Must check for multicast addresses and disallow binding 354 * to them. 355 */ 356 if (sin6p->sin6_family == AF_INET6 && 357 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 358 return (EAFNOSUPPORT); 359 360 TCPDEBUG0; 361 inp = sotoinpcb(so); 362 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 363 INP_WLOCK(inp); 364 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 365 error = EINVAL; 366 goto out; 367 } 368 tp = intotcpcb(inp); 369 TCPDEBUG1(); 370 INP_HASH_WLOCK(&V_tcbinfo); 371 inp->inp_vflag &= ~INP_IPV4; 372 inp->inp_vflag |= INP_IPV6; 373 #ifdef INET 374 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 375 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 376 inp->inp_vflag |= INP_IPV4; 377 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 378 struct sockaddr_in sin; 379 380 in6_sin6_2_sin(&sin, sin6p); 381 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 382 error = EAFNOSUPPORT; 383 INP_HASH_WUNLOCK(&V_tcbinfo); 384 goto out; 385 } 386 inp->inp_vflag |= INP_IPV4; 387 inp->inp_vflag &= ~INP_IPV6; 388 error = in_pcbbind(inp, (struct sockaddr *)&sin, 389 td->td_ucred); 390 INP_HASH_WUNLOCK(&V_tcbinfo); 391 goto out; 392 } 393 } 394 #endif 395 error = in6_pcbbind(inp, nam, td->td_ucred); 396 INP_HASH_WUNLOCK(&V_tcbinfo); 397 out: 398 TCPDEBUG2(PRU_BIND); 399 TCP_PROBE2(debug__user, tp, PRU_BIND); 400 INP_WUNLOCK(inp); 401 return (error); 402 } 403 #endif /* INET6 */ 404 405 #ifdef INET 406 /* 407 * Prepare to accept connections. 408 */ 409 static int 410 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 411 { 412 int error = 0; 413 struct inpcb *inp; 414 struct tcpcb *tp = NULL; 415 416 TCPDEBUG0; 417 inp = sotoinpcb(so); 418 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 419 INP_WLOCK(inp); 420 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 421 error = EINVAL; 422 goto out; 423 } 424 tp = intotcpcb(inp); 425 TCPDEBUG1(); 426 SOCK_LOCK(so); 427 error = solisten_proto_check(so); 428 INP_HASH_WLOCK(&V_tcbinfo); 429 if (error == 0 && inp->inp_lport == 0) 430 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 431 INP_HASH_WUNLOCK(&V_tcbinfo); 432 if (error == 0) { 433 tcp_state_change(tp, TCPS_LISTEN); 434 solisten_proto(so, backlog); 435 #ifdef TCP_OFFLOAD 436 if ((so->so_options & SO_NO_OFFLOAD) == 0) 437 tcp_offload_listen_start(tp); 438 #endif 439 } 440 SOCK_UNLOCK(so); 441 442 if (IS_FASTOPEN(tp->t_flags)) 443 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 444 445 out: 446 TCPDEBUG2(PRU_LISTEN); 447 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 448 INP_WUNLOCK(inp); 449 return (error); 450 } 451 #endif /* INET */ 452 453 #ifdef INET6 454 static int 455 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 456 { 457 int error = 0; 458 struct inpcb *inp; 459 struct tcpcb *tp = NULL; 460 461 TCPDEBUG0; 462 inp = sotoinpcb(so); 463 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 464 INP_WLOCK(inp); 465 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 466 error = EINVAL; 467 goto out; 468 } 469 tp = intotcpcb(inp); 470 TCPDEBUG1(); 471 SOCK_LOCK(so); 472 error = solisten_proto_check(so); 473 INP_HASH_WLOCK(&V_tcbinfo); 474 if (error == 0 && inp->inp_lport == 0) { 475 inp->inp_vflag &= ~INP_IPV4; 476 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 477 inp->inp_vflag |= INP_IPV4; 478 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 479 } 480 INP_HASH_WUNLOCK(&V_tcbinfo); 481 if (error == 0) { 482 tcp_state_change(tp, TCPS_LISTEN); 483 solisten_proto(so, backlog); 484 #ifdef TCP_OFFLOAD 485 if ((so->so_options & SO_NO_OFFLOAD) == 0) 486 tcp_offload_listen_start(tp); 487 #endif 488 } 489 SOCK_UNLOCK(so); 490 491 if (IS_FASTOPEN(tp->t_flags)) 492 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 493 494 out: 495 TCPDEBUG2(PRU_LISTEN); 496 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 497 INP_WUNLOCK(inp); 498 return (error); 499 } 500 #endif /* INET6 */ 501 502 #ifdef INET 503 /* 504 * Initiate connection to peer. 505 * Create a template for use in transmissions on this connection. 506 * Enter SYN_SENT state, and mark socket as connecting. 507 * Start keep-alive timer, and seed output sequence space. 508 * Send initial segment on connection. 509 */ 510 static int 511 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 512 { 513 int error = 0; 514 struct inpcb *inp; 515 struct tcpcb *tp = NULL; 516 struct sockaddr_in *sinp; 517 518 sinp = (struct sockaddr_in *)nam; 519 if (nam->sa_len != sizeof (*sinp)) 520 return (EINVAL); 521 /* 522 * Must disallow TCP ``connections'' to multicast addresses. 523 */ 524 if (sinp->sin_family == AF_INET 525 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 526 return (EAFNOSUPPORT); 527 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 528 return (error); 529 530 TCPDEBUG0; 531 inp = sotoinpcb(so); 532 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 533 INP_WLOCK(inp); 534 if (inp->inp_flags & INP_TIMEWAIT) { 535 error = EADDRINUSE; 536 goto out; 537 } 538 if (inp->inp_flags & INP_DROPPED) { 539 error = ECONNREFUSED; 540 goto out; 541 } 542 tp = intotcpcb(inp); 543 TCPDEBUG1(); 544 if ((error = tcp_connect(tp, nam, td)) != 0) 545 goto out; 546 #ifdef TCP_OFFLOAD 547 if (registered_toedevs > 0 && 548 (so->so_options & SO_NO_OFFLOAD) == 0 && 549 (error = tcp_offload_connect(so, nam)) == 0) 550 goto out; 551 #endif 552 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 553 error = tp->t_fb->tfb_tcp_output(tp); 554 out: 555 TCPDEBUG2(PRU_CONNECT); 556 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 557 INP_WUNLOCK(inp); 558 return (error); 559 } 560 #endif /* INET */ 561 562 #ifdef INET6 563 static int 564 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 565 { 566 int error = 0; 567 struct inpcb *inp; 568 struct tcpcb *tp = NULL; 569 struct sockaddr_in6 *sin6p; 570 571 TCPDEBUG0; 572 573 sin6p = (struct sockaddr_in6 *)nam; 574 if (nam->sa_len != sizeof (*sin6p)) 575 return (EINVAL); 576 /* 577 * Must disallow TCP ``connections'' to multicast addresses. 578 */ 579 if (sin6p->sin6_family == AF_INET6 580 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 581 return (EAFNOSUPPORT); 582 583 inp = sotoinpcb(so); 584 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 585 INP_WLOCK(inp); 586 if (inp->inp_flags & INP_TIMEWAIT) { 587 error = EADDRINUSE; 588 goto out; 589 } 590 if (inp->inp_flags & INP_DROPPED) { 591 error = ECONNREFUSED; 592 goto out; 593 } 594 tp = intotcpcb(inp); 595 TCPDEBUG1(); 596 #ifdef INET 597 /* 598 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 599 * therefore probably require the hash lock, which isn't held here. 600 * Is this a significant problem? 601 */ 602 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 603 struct sockaddr_in sin; 604 605 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 606 error = EINVAL; 607 goto out; 608 } 609 if ((inp->inp_vflag & INP_IPV4) == 0) { 610 error = EAFNOSUPPORT; 611 goto out; 612 } 613 614 in6_sin6_2_sin(&sin, sin6p); 615 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 616 error = EAFNOSUPPORT; 617 goto out; 618 } 619 inp->inp_vflag |= INP_IPV4; 620 inp->inp_vflag &= ~INP_IPV6; 621 if ((error = prison_remote_ip4(td->td_ucred, 622 &sin.sin_addr)) != 0) 623 goto out; 624 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 625 goto out; 626 #ifdef TCP_OFFLOAD 627 if (registered_toedevs > 0 && 628 (so->so_options & SO_NO_OFFLOAD) == 0 && 629 (error = tcp_offload_connect(so, nam)) == 0) 630 goto out; 631 #endif 632 error = tp->t_fb->tfb_tcp_output(tp); 633 goto out; 634 } else { 635 if ((inp->inp_vflag & INP_IPV6) == 0) { 636 error = EAFNOSUPPORT; 637 goto out; 638 } 639 } 640 #endif 641 inp->inp_vflag &= ~INP_IPV4; 642 inp->inp_vflag |= INP_IPV6; 643 inp->inp_inc.inc_flags |= INC_ISIPV6; 644 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 645 goto out; 646 if ((error = tcp6_connect(tp, nam, td)) != 0) 647 goto out; 648 #ifdef TCP_OFFLOAD 649 if (registered_toedevs > 0 && 650 (so->so_options & SO_NO_OFFLOAD) == 0 && 651 (error = tcp_offload_connect(so, nam)) == 0) 652 goto out; 653 #endif 654 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 655 error = tp->t_fb->tfb_tcp_output(tp); 656 657 out: 658 TCPDEBUG2(PRU_CONNECT); 659 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 660 INP_WUNLOCK(inp); 661 return (error); 662 } 663 #endif /* INET6 */ 664 665 /* 666 * Initiate disconnect from peer. 667 * If connection never passed embryonic stage, just drop; 668 * else if don't need to let data drain, then can just drop anyways, 669 * else have to begin TCP shutdown process: mark socket disconnecting, 670 * drain unread data, state switch to reflect user close, and 671 * send segment (e.g. FIN) to peer. Socket will be really disconnected 672 * when peer sends FIN and acks ours. 673 * 674 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 675 */ 676 static int 677 tcp_usr_disconnect(struct socket *so) 678 { 679 struct inpcb *inp; 680 struct tcpcb *tp = NULL; 681 struct epoch_tracker et; 682 int error = 0; 683 684 TCPDEBUG0; 685 INP_INFO_RLOCK_ET(&V_tcbinfo, et); 686 inp = sotoinpcb(so); 687 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 688 INP_WLOCK(inp); 689 if (inp->inp_flags & INP_TIMEWAIT) 690 goto out; 691 if (inp->inp_flags & INP_DROPPED) { 692 error = ECONNRESET; 693 goto out; 694 } 695 tp = intotcpcb(inp); 696 TCPDEBUG1(); 697 tcp_disconnect(tp); 698 out: 699 TCPDEBUG2(PRU_DISCONNECT); 700 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 701 INP_WUNLOCK(inp); 702 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 703 return (error); 704 } 705 706 #ifdef INET 707 /* 708 * Accept a connection. Essentially all the work is done at higher levels; 709 * just return the address of the peer, storing through addr. 710 */ 711 static int 712 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 713 { 714 int error = 0; 715 struct inpcb *inp = NULL; 716 struct tcpcb *tp = NULL; 717 struct in_addr addr; 718 in_port_t port = 0; 719 TCPDEBUG0; 720 721 if (so->so_state & SS_ISDISCONNECTED) 722 return (ECONNABORTED); 723 724 inp = sotoinpcb(so); 725 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 726 INP_WLOCK(inp); 727 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 728 error = ECONNABORTED; 729 goto out; 730 } 731 tp = intotcpcb(inp); 732 TCPDEBUG1(); 733 734 /* 735 * We inline in_getpeeraddr and COMMON_END here, so that we can 736 * copy the data of interest and defer the malloc until after we 737 * release the lock. 738 */ 739 port = inp->inp_fport; 740 addr = inp->inp_faddr; 741 742 out: 743 TCPDEBUG2(PRU_ACCEPT); 744 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 745 INP_WUNLOCK(inp); 746 if (error == 0) 747 *nam = in_sockaddr(port, &addr); 748 return error; 749 } 750 #endif /* INET */ 751 752 #ifdef INET6 753 static int 754 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 755 { 756 struct inpcb *inp = NULL; 757 int error = 0; 758 struct tcpcb *tp = NULL; 759 struct in_addr addr; 760 struct in6_addr addr6; 761 struct epoch_tracker et; 762 in_port_t port = 0; 763 int v4 = 0; 764 TCPDEBUG0; 765 766 if (so->so_state & SS_ISDISCONNECTED) 767 return (ECONNABORTED); 768 769 inp = sotoinpcb(so); 770 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 771 INP_INFO_RLOCK_ET(&V_tcbinfo, et); 772 INP_WLOCK(inp); 773 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 774 error = ECONNABORTED; 775 goto out; 776 } 777 tp = intotcpcb(inp); 778 TCPDEBUG1(); 779 780 /* 781 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 782 * copy the data of interest and defer the malloc until after we 783 * release the lock. 784 */ 785 if (inp->inp_vflag & INP_IPV4) { 786 v4 = 1; 787 port = inp->inp_fport; 788 addr = inp->inp_faddr; 789 } else { 790 port = inp->inp_fport; 791 addr6 = inp->in6p_faddr; 792 } 793 794 out: 795 TCPDEBUG2(PRU_ACCEPT); 796 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 797 INP_WUNLOCK(inp); 798 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 799 if (error == 0) { 800 if (v4) 801 *nam = in6_v4mapsin6_sockaddr(port, &addr); 802 else 803 *nam = in6_sockaddr(port, &addr6); 804 } 805 return error; 806 } 807 #endif /* INET6 */ 808 809 /* 810 * Mark the connection as being incapable of further output. 811 */ 812 static int 813 tcp_usr_shutdown(struct socket *so) 814 { 815 int error = 0; 816 struct inpcb *inp; 817 struct tcpcb *tp = NULL; 818 struct epoch_tracker et; 819 820 TCPDEBUG0; 821 INP_INFO_RLOCK_ET(&V_tcbinfo, et); 822 inp = sotoinpcb(so); 823 KASSERT(inp != NULL, ("inp == NULL")); 824 INP_WLOCK(inp); 825 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 826 error = ECONNRESET; 827 goto out; 828 } 829 tp = intotcpcb(inp); 830 TCPDEBUG1(); 831 socantsendmore(so); 832 tcp_usrclosed(tp); 833 if (!(inp->inp_flags & INP_DROPPED)) 834 error = tp->t_fb->tfb_tcp_output(tp); 835 836 out: 837 TCPDEBUG2(PRU_SHUTDOWN); 838 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 839 INP_WUNLOCK(inp); 840 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 841 842 return (error); 843 } 844 845 /* 846 * After a receive, possibly send window update to peer. 847 */ 848 static int 849 tcp_usr_rcvd(struct socket *so, int flags) 850 { 851 struct inpcb *inp; 852 struct tcpcb *tp = NULL; 853 int error = 0; 854 855 TCPDEBUG0; 856 inp = sotoinpcb(so); 857 KASSERT(inp != NULL, ("tcp_usr_rcvd: 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 /* 866 * For passively-created TFO connections, don't attempt a window 867 * update while still in SYN_RECEIVED as this may trigger an early 868 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 869 * application response data, or failing that, when the DELACK timer 870 * expires. 871 */ 872 if (IS_FASTOPEN(tp->t_flags) && 873 (tp->t_state == TCPS_SYN_RECEIVED)) 874 goto out; 875 #ifdef TCP_OFFLOAD 876 if (tp->t_flags & TF_TOE) 877 tcp_offload_rcvd(tp); 878 else 879 #endif 880 tp->t_fb->tfb_tcp_output(tp); 881 882 out: 883 TCPDEBUG2(PRU_RCVD); 884 TCP_PROBE2(debug__user, tp, PRU_RCVD); 885 INP_WUNLOCK(inp); 886 return (error); 887 } 888 889 /* 890 * Do a send by putting data in output queue and updating urgent 891 * marker if URG set. Possibly send more data. Unlike the other 892 * pru_*() routines, the mbuf chains are our responsibility. We 893 * must either enqueue them or free them. The other pru_* routines 894 * generally are caller-frees. 895 */ 896 static int 897 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 898 struct sockaddr *nam, struct mbuf *control, struct thread *td) 899 { 900 int error = 0; 901 struct inpcb *inp; 902 struct tcpcb *tp = NULL; 903 struct epoch_tracker net_et; 904 #ifdef INET 905 #ifdef INET6 906 struct sockaddr_in sin; 907 #endif 908 struct sockaddr_in *sinp; 909 #endif 910 #ifdef INET6 911 int isipv6; 912 #endif 913 TCPDEBUG0; 914 915 /* 916 * We require the pcbinfo lock if we will close the socket as part of 917 * this call. 918 */ 919 if (flags & PRUS_EOF) 920 INP_INFO_RLOCK_ET(&V_tcbinfo, net_et); 921 inp = sotoinpcb(so); 922 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 923 INP_WLOCK(inp); 924 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 925 if (control) 926 m_freem(control); 927 /* 928 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 929 * for freeing memory. 930 */ 931 if (m && (flags & PRUS_NOTREADY) == 0) 932 m_freem(m); 933 error = ECONNRESET; 934 goto out; 935 } 936 tp = intotcpcb(inp); 937 TCPDEBUG1(); 938 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 939 switch (nam->sa_family) { 940 #ifdef INET 941 case AF_INET: 942 sinp = (struct sockaddr_in *)nam; 943 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 944 if (m) 945 m_freem(m); 946 error = EINVAL; 947 goto out; 948 } 949 if ((inp->inp_vflag & INP_IPV6) != 0) { 950 if (m) 951 m_freem(m); 952 error = EAFNOSUPPORT; 953 goto out; 954 } 955 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 956 if (m) 957 m_freem(m); 958 error = EAFNOSUPPORT; 959 goto out; 960 } 961 if ((error = prison_remote_ip4(td->td_ucred, 962 &sinp->sin_addr))) { 963 if (m) 964 m_freem(m); 965 goto out; 966 } 967 #ifdef INET6 968 isipv6 = 0; 969 #endif 970 break; 971 #endif /* INET */ 972 #ifdef INET6 973 case AF_INET6: 974 { 975 struct sockaddr_in6 *sin6p; 976 977 sin6p = (struct sockaddr_in6 *)nam; 978 if (sin6p->sin6_len != sizeof(struct sockaddr_in6)) { 979 if (m) 980 m_freem(m); 981 error = EINVAL; 982 goto out; 983 } 984 if (IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 985 if (m) 986 m_freem(m); 987 error = EAFNOSUPPORT; 988 goto out; 989 } 990 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 991 #ifdef INET 992 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 993 error = EINVAL; 994 if (m) 995 m_freem(m); 996 goto out; 997 } 998 if ((inp->inp_vflag & INP_IPV4) == 0) { 999 error = EAFNOSUPPORT; 1000 if (m) 1001 m_freem(m); 1002 goto out; 1003 } 1004 inp->inp_vflag &= ~INP_IPV6; 1005 sinp = &sin; 1006 in6_sin6_2_sin(sinp, sin6p); 1007 if (IN_MULTICAST( 1008 ntohl(sinp->sin_addr.s_addr))) { 1009 error = EAFNOSUPPORT; 1010 if (m) 1011 m_freem(m); 1012 goto out; 1013 } 1014 if ((error = prison_remote_ip4(td->td_ucred, 1015 &sinp->sin_addr))) { 1016 if (m) 1017 m_freem(m); 1018 goto out; 1019 } 1020 isipv6 = 0; 1021 #else /* !INET */ 1022 error = EAFNOSUPPORT; 1023 if (m) 1024 m_freem(m); 1025 goto out; 1026 #endif /* INET */ 1027 } else { 1028 if ((inp->inp_vflag & INP_IPV6) == 0) { 1029 if (m) 1030 m_freem(m); 1031 error = EAFNOSUPPORT; 1032 goto out; 1033 } 1034 inp->inp_vflag &= ~INP_IPV4; 1035 inp->inp_inc.inc_flags |= INC_ISIPV6; 1036 if ((error = prison_remote_ip6(td->td_ucred, 1037 &sin6p->sin6_addr))) { 1038 if (m) 1039 m_freem(m); 1040 goto out; 1041 } 1042 isipv6 = 1; 1043 } 1044 break; 1045 } 1046 #endif /* INET6 */ 1047 default: 1048 if (m) 1049 m_freem(m); 1050 error = EAFNOSUPPORT; 1051 goto out; 1052 } 1053 } 1054 if (control) { 1055 /* TCP doesn't do control messages (rights, creds, etc) */ 1056 if (control->m_len) { 1057 m_freem(control); 1058 if (m) 1059 m_freem(m); 1060 error = EINVAL; 1061 goto out; 1062 } 1063 m_freem(control); /* empty control, just free it */ 1064 } 1065 if (!(flags & PRUS_OOB)) { 1066 sbappendstream(&so->so_snd, m, flags); 1067 if (nam && tp->t_state < TCPS_SYN_SENT) { 1068 /* 1069 * Do implied connect if not yet connected, 1070 * initialize window to default value, and 1071 * initialize maxseg using peer's cached MSS. 1072 */ 1073 #ifdef INET6 1074 if (isipv6) 1075 error = tcp6_connect(tp, nam, td); 1076 #endif /* INET6 */ 1077 #if defined(INET6) && defined(INET) 1078 else 1079 #endif 1080 #ifdef INET 1081 error = tcp_connect(tp, 1082 (struct sockaddr *)sinp, td); 1083 #endif 1084 if (error) 1085 goto out; 1086 if (IS_FASTOPEN(tp->t_flags)) 1087 tcp_fastopen_connect(tp); 1088 else { 1089 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1090 tcp_mss(tp, -1); 1091 } 1092 } 1093 if (flags & PRUS_EOF) { 1094 /* 1095 * Close the send side of the connection after 1096 * the data is sent. 1097 */ 1098 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1099 socantsendmore(so); 1100 tcp_usrclosed(tp); 1101 } 1102 if (!(inp->inp_flags & INP_DROPPED) && 1103 !(flags & PRUS_NOTREADY)) { 1104 if (flags & PRUS_MORETOCOME) 1105 tp->t_flags |= TF_MORETOCOME; 1106 error = tp->t_fb->tfb_tcp_output(tp); 1107 if (flags & PRUS_MORETOCOME) 1108 tp->t_flags &= ~TF_MORETOCOME; 1109 } 1110 } else { 1111 /* 1112 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1113 */ 1114 SOCKBUF_LOCK(&so->so_snd); 1115 if (sbspace(&so->so_snd) < -512) { 1116 SOCKBUF_UNLOCK(&so->so_snd); 1117 m_freem(m); 1118 error = ENOBUFS; 1119 goto out; 1120 } 1121 /* 1122 * According to RFC961 (Assigned Protocols), 1123 * the urgent pointer points to the last octet 1124 * of urgent data. We continue, however, 1125 * to consider it to indicate the first octet 1126 * of data past the urgent section. 1127 * Otherwise, snd_up should be one lower. 1128 */ 1129 sbappendstream_locked(&so->so_snd, m, flags); 1130 SOCKBUF_UNLOCK(&so->so_snd); 1131 if (nam && tp->t_state < TCPS_SYN_SENT) { 1132 /* 1133 * Do implied connect if not yet connected, 1134 * initialize window to default value, and 1135 * initialize maxseg using peer's cached MSS. 1136 */ 1137 1138 /* 1139 * Not going to contemplate SYN|URG 1140 */ 1141 if (IS_FASTOPEN(tp->t_flags)) 1142 tp->t_flags &= ~TF_FASTOPEN; 1143 #ifdef INET6 1144 if (isipv6) 1145 error = tcp6_connect(tp, nam, td); 1146 #endif /* INET6 */ 1147 #if defined(INET6) && defined(INET) 1148 else 1149 #endif 1150 #ifdef INET 1151 error = tcp_connect(tp, 1152 (struct sockaddr *)sinp, td); 1153 #endif 1154 if (error) 1155 goto out; 1156 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1157 tcp_mss(tp, -1); 1158 } 1159 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1160 if (!(flags & PRUS_NOTREADY)) { 1161 tp->t_flags |= TF_FORCEDATA; 1162 error = tp->t_fb->tfb_tcp_output(tp); 1163 tp->t_flags &= ~TF_FORCEDATA; 1164 } 1165 } 1166 TCP_LOG_EVENT(tp, NULL, 1167 &inp->inp_socket->so_rcv, 1168 &inp->inp_socket->so_snd, 1169 TCP_LOG_USERSEND, error, 1170 0, NULL, false); 1171 out: 1172 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1173 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1174 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1175 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1176 INP_WUNLOCK(inp); 1177 if (flags & PRUS_EOF) 1178 INP_INFO_RUNLOCK_ET(&V_tcbinfo, net_et); 1179 return (error); 1180 } 1181 1182 static int 1183 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1184 { 1185 struct inpcb *inp; 1186 struct tcpcb *tp; 1187 int error; 1188 1189 inp = sotoinpcb(so); 1190 INP_WLOCK(inp); 1191 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1192 INP_WUNLOCK(inp); 1193 for (int i = 0; i < count; i++) 1194 m = m_free(m); 1195 return (ECONNRESET); 1196 } 1197 tp = intotcpcb(inp); 1198 1199 SOCKBUF_LOCK(&so->so_snd); 1200 error = sbready(&so->so_snd, m, count); 1201 SOCKBUF_UNLOCK(&so->so_snd); 1202 if (error == 0) 1203 error = tp->t_fb->tfb_tcp_output(tp); 1204 INP_WUNLOCK(inp); 1205 1206 return (error); 1207 } 1208 1209 /* 1210 * Abort the TCP. Drop the connection abruptly. 1211 */ 1212 static void 1213 tcp_usr_abort(struct socket *so) 1214 { 1215 struct inpcb *inp; 1216 struct tcpcb *tp = NULL; 1217 struct epoch_tracker et; 1218 TCPDEBUG0; 1219 1220 inp = sotoinpcb(so); 1221 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1222 1223 INP_INFO_RLOCK_ET(&V_tcbinfo, et); 1224 INP_WLOCK(inp); 1225 KASSERT(inp->inp_socket != NULL, 1226 ("tcp_usr_abort: inp_socket == NULL")); 1227 1228 /* 1229 * If we still have full TCP state, and we're not dropped, drop. 1230 */ 1231 if (!(inp->inp_flags & INP_TIMEWAIT) && 1232 !(inp->inp_flags & INP_DROPPED)) { 1233 tp = intotcpcb(inp); 1234 TCPDEBUG1(); 1235 tp = tcp_drop(tp, ECONNABORTED); 1236 if (tp == NULL) 1237 goto dropped; 1238 TCPDEBUG2(PRU_ABORT); 1239 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1240 } 1241 if (!(inp->inp_flags & INP_DROPPED)) { 1242 SOCK_LOCK(so); 1243 so->so_state |= SS_PROTOREF; 1244 SOCK_UNLOCK(so); 1245 inp->inp_flags |= INP_SOCKREF; 1246 } 1247 INP_WUNLOCK(inp); 1248 dropped: 1249 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 1250 } 1251 1252 /* 1253 * TCP socket is closed. Start friendly disconnect. 1254 */ 1255 static void 1256 tcp_usr_close(struct socket *so) 1257 { 1258 struct inpcb *inp; 1259 struct tcpcb *tp = NULL; 1260 struct epoch_tracker et; 1261 TCPDEBUG0; 1262 1263 inp = sotoinpcb(so); 1264 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1265 1266 INP_INFO_RLOCK_ET(&V_tcbinfo, et); 1267 INP_WLOCK(inp); 1268 KASSERT(inp->inp_socket != NULL, 1269 ("tcp_usr_close: inp_socket == NULL")); 1270 1271 /* 1272 * If we still have full TCP state, and we're not dropped, initiate 1273 * a disconnect. 1274 */ 1275 if (!(inp->inp_flags & INP_TIMEWAIT) && 1276 !(inp->inp_flags & INP_DROPPED)) { 1277 tp = intotcpcb(inp); 1278 TCPDEBUG1(); 1279 tcp_disconnect(tp); 1280 TCPDEBUG2(PRU_CLOSE); 1281 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1282 } 1283 if (!(inp->inp_flags & INP_DROPPED)) { 1284 SOCK_LOCK(so); 1285 so->so_state |= SS_PROTOREF; 1286 SOCK_UNLOCK(so); 1287 inp->inp_flags |= INP_SOCKREF; 1288 } 1289 INP_WUNLOCK(inp); 1290 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 1291 } 1292 1293 /* 1294 * Receive out-of-band data. 1295 */ 1296 static int 1297 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1298 { 1299 int error = 0; 1300 struct inpcb *inp; 1301 struct tcpcb *tp = NULL; 1302 1303 TCPDEBUG0; 1304 inp = sotoinpcb(so); 1305 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1306 INP_WLOCK(inp); 1307 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1308 error = ECONNRESET; 1309 goto out; 1310 } 1311 tp = intotcpcb(inp); 1312 TCPDEBUG1(); 1313 if ((so->so_oobmark == 0 && 1314 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1315 so->so_options & SO_OOBINLINE || 1316 tp->t_oobflags & TCPOOB_HADDATA) { 1317 error = EINVAL; 1318 goto out; 1319 } 1320 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1321 error = EWOULDBLOCK; 1322 goto out; 1323 } 1324 m->m_len = 1; 1325 *mtod(m, caddr_t) = tp->t_iobc; 1326 if ((flags & MSG_PEEK) == 0) 1327 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1328 1329 out: 1330 TCPDEBUG2(PRU_RCVOOB); 1331 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1332 INP_WUNLOCK(inp); 1333 return (error); 1334 } 1335 1336 #ifdef INET 1337 struct pr_usrreqs tcp_usrreqs = { 1338 .pru_abort = tcp_usr_abort, 1339 .pru_accept = tcp_usr_accept, 1340 .pru_attach = tcp_usr_attach, 1341 .pru_bind = tcp_usr_bind, 1342 .pru_connect = tcp_usr_connect, 1343 .pru_control = in_control, 1344 .pru_detach = tcp_usr_detach, 1345 .pru_disconnect = tcp_usr_disconnect, 1346 .pru_listen = tcp_usr_listen, 1347 .pru_peeraddr = in_getpeeraddr, 1348 .pru_rcvd = tcp_usr_rcvd, 1349 .pru_rcvoob = tcp_usr_rcvoob, 1350 .pru_send = tcp_usr_send, 1351 .pru_ready = tcp_usr_ready, 1352 .pru_shutdown = tcp_usr_shutdown, 1353 .pru_sockaddr = in_getsockaddr, 1354 .pru_sosetlabel = in_pcbsosetlabel, 1355 .pru_close = tcp_usr_close, 1356 }; 1357 #endif /* INET */ 1358 1359 #ifdef INET6 1360 struct pr_usrreqs tcp6_usrreqs = { 1361 .pru_abort = tcp_usr_abort, 1362 .pru_accept = tcp6_usr_accept, 1363 .pru_attach = tcp_usr_attach, 1364 .pru_bind = tcp6_usr_bind, 1365 .pru_connect = tcp6_usr_connect, 1366 .pru_control = in6_control, 1367 .pru_detach = tcp_usr_detach, 1368 .pru_disconnect = tcp_usr_disconnect, 1369 .pru_listen = tcp6_usr_listen, 1370 .pru_peeraddr = in6_mapped_peeraddr, 1371 .pru_rcvd = tcp_usr_rcvd, 1372 .pru_rcvoob = tcp_usr_rcvoob, 1373 .pru_send = tcp_usr_send, 1374 .pru_ready = tcp_usr_ready, 1375 .pru_shutdown = tcp_usr_shutdown, 1376 .pru_sockaddr = in6_mapped_sockaddr, 1377 .pru_sosetlabel = in_pcbsosetlabel, 1378 .pru_close = tcp_usr_close, 1379 }; 1380 #endif /* INET6 */ 1381 1382 #ifdef INET 1383 /* 1384 * Common subroutine to open a TCP connection to remote host specified 1385 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1386 * port number if needed. Call in_pcbconnect_setup to do the routing and 1387 * to choose a local host address (interface). If there is an existing 1388 * incarnation of the same connection in TIME-WAIT state and if the remote 1389 * host was sending CC options and if the connection duration was < MSL, then 1390 * truncate the previous TIME-WAIT state and proceed. 1391 * Initialize connection parameters and enter SYN-SENT state. 1392 */ 1393 static int 1394 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1395 { 1396 struct inpcb *inp = tp->t_inpcb, *oinp; 1397 struct socket *so = inp->inp_socket; 1398 struct in_addr laddr; 1399 u_short lport; 1400 int error; 1401 1402 INP_WLOCK_ASSERT(inp); 1403 INP_HASH_WLOCK(&V_tcbinfo); 1404 1405 if (inp->inp_lport == 0) { 1406 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1407 if (error) 1408 goto out; 1409 } 1410 1411 /* 1412 * Cannot simply call in_pcbconnect, because there might be an 1413 * earlier incarnation of this same connection still in 1414 * TIME_WAIT state, creating an ADDRINUSE error. 1415 */ 1416 laddr = inp->inp_laddr; 1417 lport = inp->inp_lport; 1418 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1419 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1420 if (error && oinp == NULL) 1421 goto out; 1422 if (oinp) { 1423 error = EADDRINUSE; 1424 goto out; 1425 } 1426 inp->inp_laddr = laddr; 1427 in_pcbrehash(inp); 1428 INP_HASH_WUNLOCK(&V_tcbinfo); 1429 1430 /* 1431 * Compute window scaling to request: 1432 * Scale to fit into sweet spot. See tcp_syncache.c. 1433 * XXX: This should move to tcp_output(). 1434 */ 1435 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1436 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1437 tp->request_r_scale++; 1438 1439 soisconnecting(so); 1440 TCPSTAT_INC(tcps_connattempt); 1441 tcp_state_change(tp, TCPS_SYN_SENT); 1442 tp->iss = tcp_new_isn(&inp->inp_inc); 1443 if (tp->t_flags & TF_REQ_TSTMP) 1444 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1445 tcp_sendseqinit(tp); 1446 1447 return 0; 1448 1449 out: 1450 INP_HASH_WUNLOCK(&V_tcbinfo); 1451 return (error); 1452 } 1453 #endif /* INET */ 1454 1455 #ifdef INET6 1456 static int 1457 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1458 { 1459 struct inpcb *inp = tp->t_inpcb; 1460 int error; 1461 1462 INP_WLOCK_ASSERT(inp); 1463 INP_HASH_WLOCK(&V_tcbinfo); 1464 1465 if (inp->inp_lport == 0) { 1466 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1467 if (error) 1468 goto out; 1469 } 1470 error = in6_pcbconnect(inp, nam, td->td_ucred); 1471 if (error != 0) 1472 goto out; 1473 INP_HASH_WUNLOCK(&V_tcbinfo); 1474 1475 /* Compute window scaling to request. */ 1476 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1477 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1478 tp->request_r_scale++; 1479 1480 soisconnecting(inp->inp_socket); 1481 TCPSTAT_INC(tcps_connattempt); 1482 tcp_state_change(tp, TCPS_SYN_SENT); 1483 tp->iss = tcp_new_isn(&inp->inp_inc); 1484 if (tp->t_flags & TF_REQ_TSTMP) 1485 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1486 tcp_sendseqinit(tp); 1487 1488 return 0; 1489 1490 out: 1491 INP_HASH_WUNLOCK(&V_tcbinfo); 1492 return error; 1493 } 1494 #endif /* INET6 */ 1495 1496 /* 1497 * Export TCP internal state information via a struct tcp_info, based on the 1498 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1499 * (TCP state machine, etc). We export all information using FreeBSD-native 1500 * constants -- for example, the numeric values for tcpi_state will differ 1501 * from Linux. 1502 */ 1503 static void 1504 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1505 { 1506 1507 INP_WLOCK_ASSERT(tp->t_inpcb); 1508 bzero(ti, sizeof(*ti)); 1509 1510 ti->tcpi_state = tp->t_state; 1511 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1512 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1513 if (tp->t_flags & TF_SACK_PERMIT) 1514 ti->tcpi_options |= TCPI_OPT_SACK; 1515 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1516 ti->tcpi_options |= TCPI_OPT_WSCALE; 1517 ti->tcpi_snd_wscale = tp->snd_scale; 1518 ti->tcpi_rcv_wscale = tp->rcv_scale; 1519 } 1520 if (tp->t_flags & TF_ECN_PERMIT) 1521 ti->tcpi_options |= TCPI_OPT_ECN; 1522 1523 ti->tcpi_rto = tp->t_rxtcur * tick; 1524 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1525 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1526 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1527 1528 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1529 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1530 1531 /* 1532 * FreeBSD-specific extension fields for tcp_info. 1533 */ 1534 ti->tcpi_rcv_space = tp->rcv_wnd; 1535 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1536 ti->tcpi_snd_wnd = tp->snd_wnd; 1537 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1538 ti->tcpi_snd_nxt = tp->snd_nxt; 1539 ti->tcpi_snd_mss = tp->t_maxseg; 1540 ti->tcpi_rcv_mss = tp->t_maxseg; 1541 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1542 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1543 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1544 #ifdef TCP_OFFLOAD 1545 if (tp->t_flags & TF_TOE) { 1546 ti->tcpi_options |= TCPI_OPT_TOE; 1547 tcp_offload_tcp_info(tp, ti); 1548 } 1549 #endif 1550 } 1551 1552 /* 1553 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1554 * socket option arguments. When it re-acquires the lock after the copy, it 1555 * has to revalidate that the connection is still valid for the socket 1556 * option. 1557 */ 1558 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1559 INP_WLOCK(inp); \ 1560 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1561 INP_WUNLOCK(inp); \ 1562 cleanup; \ 1563 return (ECONNRESET); \ 1564 } \ 1565 tp = intotcpcb(inp); \ 1566 } while(0) 1567 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1568 1569 int 1570 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1571 { 1572 int error; 1573 struct inpcb *inp; 1574 struct tcpcb *tp; 1575 struct tcp_function_block *blk; 1576 struct tcp_function_set fsn; 1577 1578 error = 0; 1579 inp = sotoinpcb(so); 1580 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1581 INP_WLOCK(inp); 1582 if (sopt->sopt_level != IPPROTO_TCP) { 1583 #ifdef INET6 1584 if (inp->inp_vflag & INP_IPV6PROTO) { 1585 INP_WUNLOCK(inp); 1586 error = ip6_ctloutput(so, sopt); 1587 /* 1588 * In case of the IPV6_USE_MIN_MTU socket option, 1589 * the INC_IPV6MINMTU flag to announce a corresponding 1590 * MSS during the initial handshake. 1591 * If the TCP connection is not in the front states, 1592 * just reduce the MSS being used. 1593 * This avoids the sending of TCP segments which will 1594 * be fragmented at the IPv6 layer. 1595 */ 1596 if ((error == 0) && 1597 (sopt->sopt_dir == SOPT_SET) && 1598 (sopt->sopt_level == IPPROTO_IPV6) && 1599 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1600 INP_WLOCK(inp); 1601 if ((inp->inp_flags & 1602 (INP_TIMEWAIT | INP_DROPPED))) { 1603 INP_WUNLOCK(inp); 1604 return (ECONNRESET); 1605 } 1606 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1607 tp = intotcpcb(inp); 1608 if ((tp->t_state >= TCPS_SYN_SENT) && 1609 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1610 struct ip6_pktopts *opt; 1611 1612 opt = inp->in6p_outputopts; 1613 if ((opt != NULL) && 1614 (opt->ip6po_minmtu == 1615 IP6PO_MINMTU_ALL)) { 1616 if (tp->t_maxseg > TCP6_MSS) { 1617 tp->t_maxseg = TCP6_MSS; 1618 } 1619 } 1620 } 1621 INP_WUNLOCK(inp); 1622 } 1623 } 1624 #endif /* INET6 */ 1625 #if defined(INET6) && defined(INET) 1626 else 1627 #endif 1628 #ifdef INET 1629 { 1630 INP_WUNLOCK(inp); 1631 error = ip_ctloutput(so, sopt); 1632 } 1633 #endif 1634 return (error); 1635 } 1636 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1637 INP_WUNLOCK(inp); 1638 return (ECONNRESET); 1639 } 1640 tp = intotcpcb(inp); 1641 /* 1642 * Protect the TCP option TCP_FUNCTION_BLK so 1643 * that a sub-function can *never* overwrite this. 1644 */ 1645 if ((sopt->sopt_dir == SOPT_SET) && 1646 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1647 INP_WUNLOCK(inp); 1648 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1649 sizeof fsn); 1650 if (error) 1651 return (error); 1652 INP_WLOCK_RECHECK(inp); 1653 blk = find_and_ref_tcp_functions(&fsn); 1654 if (blk == NULL) { 1655 INP_WUNLOCK(inp); 1656 return (ENOENT); 1657 } 1658 if (tp->t_fb == blk) { 1659 /* You already have this */ 1660 refcount_release(&blk->tfb_refcnt); 1661 INP_WUNLOCK(inp); 1662 return (0); 1663 } 1664 if (tp->t_state != TCPS_CLOSED) { 1665 /* 1666 * The user has advanced the state 1667 * past the initial point, we may not 1668 * be able to switch. 1669 */ 1670 if (blk->tfb_tcp_handoff_ok != NULL) { 1671 /* 1672 * Does the stack provide a 1673 * query mechanism, if so it may 1674 * still be possible? 1675 */ 1676 error = (*blk->tfb_tcp_handoff_ok)(tp); 1677 } else 1678 error = EINVAL; 1679 if (error) { 1680 refcount_release(&blk->tfb_refcnt); 1681 INP_WUNLOCK(inp); 1682 return(error); 1683 } 1684 } 1685 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1686 refcount_release(&blk->tfb_refcnt); 1687 INP_WUNLOCK(inp); 1688 return (ENOENT); 1689 } 1690 /* 1691 * Release the old refcnt, the 1692 * lookup acquired a ref on the 1693 * new one already. 1694 */ 1695 if (tp->t_fb->tfb_tcp_fb_fini) { 1696 /* 1697 * Tell the stack to cleanup with 0 i.e. 1698 * the tcb is not going away. 1699 */ 1700 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1701 } 1702 #ifdef TCPHPTS 1703 /* Assure that we are not on any hpts */ 1704 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1705 #endif 1706 if (blk->tfb_tcp_fb_init) { 1707 error = (*blk->tfb_tcp_fb_init)(tp); 1708 if (error) { 1709 refcount_release(&blk->tfb_refcnt); 1710 if (tp->t_fb->tfb_tcp_fb_init) { 1711 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1712 /* Fall back failed, drop the connection */ 1713 INP_WUNLOCK(inp); 1714 soabort(so); 1715 return(error); 1716 } 1717 } 1718 goto err_out; 1719 } 1720 } 1721 refcount_release(&tp->t_fb->tfb_refcnt); 1722 tp->t_fb = blk; 1723 #ifdef TCP_OFFLOAD 1724 if (tp->t_flags & TF_TOE) { 1725 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1726 sopt->sopt_name); 1727 } 1728 #endif 1729 err_out: 1730 INP_WUNLOCK(inp); 1731 return (error); 1732 } else if ((sopt->sopt_dir == SOPT_GET) && 1733 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1734 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1735 TCP_FUNCTION_NAME_LEN_MAX); 1736 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1737 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1738 INP_WUNLOCK(inp); 1739 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1740 return (error); 1741 } 1742 /* Pass in the INP locked, called must unlock it */ 1743 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1744 } 1745 1746 /* 1747 * If this assert becomes untrue, we need to change the size of the buf 1748 * variable in tcp_default_ctloutput(). 1749 */ 1750 #ifdef CTASSERT 1751 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1752 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1753 #endif 1754 1755 int 1756 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1757 { 1758 int error, opt, optval; 1759 u_int ui; 1760 struct tcp_info ti; 1761 struct cc_algo *algo; 1762 char *pbuf, buf[TCP_LOG_ID_LEN]; 1763 size_t len; 1764 1765 /* 1766 * For TCP_CCALGOOPT forward the control to CC module, for both 1767 * SOPT_SET and SOPT_GET. 1768 */ 1769 switch (sopt->sopt_name) { 1770 case TCP_CCALGOOPT: 1771 INP_WUNLOCK(inp); 1772 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1773 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1774 sopt->sopt_valsize); 1775 if (error) { 1776 free(pbuf, M_TEMP); 1777 return (error); 1778 } 1779 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1780 if (CC_ALGO(tp)->ctl_output != NULL) 1781 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1782 else 1783 error = ENOENT; 1784 INP_WUNLOCK(inp); 1785 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1786 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1787 free(pbuf, M_TEMP); 1788 return (error); 1789 } 1790 1791 switch (sopt->sopt_dir) { 1792 case SOPT_SET: 1793 switch (sopt->sopt_name) { 1794 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1795 case TCP_MD5SIG: 1796 if (!TCPMD5_ENABLED()) { 1797 INP_WUNLOCK(inp); 1798 return (ENOPROTOOPT); 1799 } 1800 error = TCPMD5_PCBCTL(inp, sopt); 1801 if (error) 1802 return (error); 1803 goto unlock_and_done; 1804 #endif /* IPSEC */ 1805 1806 case TCP_NODELAY: 1807 case TCP_NOOPT: 1808 INP_WUNLOCK(inp); 1809 error = sooptcopyin(sopt, &optval, sizeof optval, 1810 sizeof optval); 1811 if (error) 1812 return (error); 1813 1814 INP_WLOCK_RECHECK(inp); 1815 switch (sopt->sopt_name) { 1816 case TCP_NODELAY: 1817 opt = TF_NODELAY; 1818 break; 1819 case TCP_NOOPT: 1820 opt = TF_NOOPT; 1821 break; 1822 default: 1823 opt = 0; /* dead code to fool gcc */ 1824 break; 1825 } 1826 1827 if (optval) 1828 tp->t_flags |= opt; 1829 else 1830 tp->t_flags &= ~opt; 1831 unlock_and_done: 1832 #ifdef TCP_OFFLOAD 1833 if (tp->t_flags & TF_TOE) { 1834 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1835 sopt->sopt_name); 1836 } 1837 #endif 1838 INP_WUNLOCK(inp); 1839 break; 1840 1841 case TCP_NOPUSH: 1842 INP_WUNLOCK(inp); 1843 error = sooptcopyin(sopt, &optval, sizeof optval, 1844 sizeof optval); 1845 if (error) 1846 return (error); 1847 1848 INP_WLOCK_RECHECK(inp); 1849 if (optval) 1850 tp->t_flags |= TF_NOPUSH; 1851 else if (tp->t_flags & TF_NOPUSH) { 1852 tp->t_flags &= ~TF_NOPUSH; 1853 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1854 error = tp->t_fb->tfb_tcp_output(tp); 1855 } 1856 goto unlock_and_done; 1857 1858 case TCP_MAXSEG: 1859 INP_WUNLOCK(inp); 1860 error = sooptcopyin(sopt, &optval, sizeof optval, 1861 sizeof optval); 1862 if (error) 1863 return (error); 1864 1865 INP_WLOCK_RECHECK(inp); 1866 if (optval > 0 && optval <= tp->t_maxseg && 1867 optval + 40 >= V_tcp_minmss) 1868 tp->t_maxseg = optval; 1869 else 1870 error = EINVAL; 1871 goto unlock_and_done; 1872 1873 case TCP_INFO: 1874 INP_WUNLOCK(inp); 1875 error = EINVAL; 1876 break; 1877 1878 case TCP_CONGESTION: 1879 INP_WUNLOCK(inp); 1880 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1881 if (error) 1882 break; 1883 buf[sopt->sopt_valsize] = '\0'; 1884 INP_WLOCK_RECHECK(inp); 1885 CC_LIST_RLOCK(); 1886 STAILQ_FOREACH(algo, &cc_list, entries) 1887 if (strncmp(buf, algo->name, 1888 TCP_CA_NAME_MAX) == 0) 1889 break; 1890 CC_LIST_RUNLOCK(); 1891 if (algo == NULL) { 1892 INP_WUNLOCK(inp); 1893 error = EINVAL; 1894 break; 1895 } 1896 /* 1897 * We hold a write lock over the tcb so it's safe to 1898 * do these things without ordering concerns. 1899 */ 1900 if (CC_ALGO(tp)->cb_destroy != NULL) 1901 CC_ALGO(tp)->cb_destroy(tp->ccv); 1902 CC_DATA(tp) = NULL; 1903 CC_ALGO(tp) = algo; 1904 /* 1905 * If something goes pear shaped initialising the new 1906 * algo, fall back to newreno (which does not 1907 * require initialisation). 1908 */ 1909 if (algo->cb_init != NULL && 1910 algo->cb_init(tp->ccv) != 0) { 1911 CC_ALGO(tp) = &newreno_cc_algo; 1912 /* 1913 * The only reason init should fail is 1914 * because of malloc. 1915 */ 1916 error = ENOMEM; 1917 } 1918 INP_WUNLOCK(inp); 1919 break; 1920 1921 case TCP_KEEPIDLE: 1922 case TCP_KEEPINTVL: 1923 case TCP_KEEPINIT: 1924 INP_WUNLOCK(inp); 1925 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1926 if (error) 1927 return (error); 1928 1929 if (ui > (UINT_MAX / hz)) { 1930 error = EINVAL; 1931 break; 1932 } 1933 ui *= hz; 1934 1935 INP_WLOCK_RECHECK(inp); 1936 switch (sopt->sopt_name) { 1937 case TCP_KEEPIDLE: 1938 tp->t_keepidle = ui; 1939 /* 1940 * XXX: better check current remaining 1941 * timeout and "merge" it with new value. 1942 */ 1943 if ((tp->t_state > TCPS_LISTEN) && 1944 (tp->t_state <= TCPS_CLOSING)) 1945 tcp_timer_activate(tp, TT_KEEP, 1946 TP_KEEPIDLE(tp)); 1947 break; 1948 case TCP_KEEPINTVL: 1949 tp->t_keepintvl = ui; 1950 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1951 (TP_MAXIDLE(tp) > 0)) 1952 tcp_timer_activate(tp, TT_2MSL, 1953 TP_MAXIDLE(tp)); 1954 break; 1955 case TCP_KEEPINIT: 1956 tp->t_keepinit = ui; 1957 if (tp->t_state == TCPS_SYN_RECEIVED || 1958 tp->t_state == TCPS_SYN_SENT) 1959 tcp_timer_activate(tp, TT_KEEP, 1960 TP_KEEPINIT(tp)); 1961 break; 1962 } 1963 goto unlock_and_done; 1964 1965 case TCP_KEEPCNT: 1966 INP_WUNLOCK(inp); 1967 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1968 if (error) 1969 return (error); 1970 1971 INP_WLOCK_RECHECK(inp); 1972 tp->t_keepcnt = ui; 1973 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1974 (TP_MAXIDLE(tp) > 0)) 1975 tcp_timer_activate(tp, TT_2MSL, 1976 TP_MAXIDLE(tp)); 1977 goto unlock_and_done; 1978 1979 #ifdef TCPPCAP 1980 case TCP_PCAP_OUT: 1981 case TCP_PCAP_IN: 1982 INP_WUNLOCK(inp); 1983 error = sooptcopyin(sopt, &optval, sizeof optval, 1984 sizeof optval); 1985 if (error) 1986 return (error); 1987 1988 INP_WLOCK_RECHECK(inp); 1989 if (optval >= 0) 1990 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1991 &(tp->t_outpkts) : &(tp->t_inpkts), 1992 optval); 1993 else 1994 error = EINVAL; 1995 goto unlock_and_done; 1996 #endif 1997 1998 case TCP_FASTOPEN: { 1999 struct tcp_fastopen tfo_optval; 2000 2001 INP_WUNLOCK(inp); 2002 if (!V_tcp_fastopen_client_enable && 2003 !V_tcp_fastopen_server_enable) 2004 return (EPERM); 2005 2006 error = sooptcopyin(sopt, &tfo_optval, 2007 sizeof(tfo_optval), sizeof(int)); 2008 if (error) 2009 return (error); 2010 2011 INP_WLOCK_RECHECK(inp); 2012 if (tfo_optval.enable) { 2013 if (tp->t_state == TCPS_LISTEN) { 2014 if (!V_tcp_fastopen_server_enable) { 2015 error = EPERM; 2016 goto unlock_and_done; 2017 } 2018 2019 tp->t_flags |= TF_FASTOPEN; 2020 if (tp->t_tfo_pending == NULL) 2021 tp->t_tfo_pending = 2022 tcp_fastopen_alloc_counter(); 2023 } else { 2024 /* 2025 * If a pre-shared key was provided, 2026 * stash it in the client cookie 2027 * field of the tcpcb for use during 2028 * connect. 2029 */ 2030 if (sopt->sopt_valsize == 2031 sizeof(tfo_optval)) { 2032 memcpy(tp->t_tfo_cookie.client, 2033 tfo_optval.psk, 2034 TCP_FASTOPEN_PSK_LEN); 2035 tp->t_tfo_client_cookie_len = 2036 TCP_FASTOPEN_PSK_LEN; 2037 } 2038 tp->t_flags |= TF_FASTOPEN; 2039 } 2040 } else 2041 tp->t_flags &= ~TF_FASTOPEN; 2042 goto unlock_and_done; 2043 } 2044 2045 #ifdef TCP_BLACKBOX 2046 case TCP_LOG: 2047 INP_WUNLOCK(inp); 2048 error = sooptcopyin(sopt, &optval, sizeof optval, 2049 sizeof optval); 2050 if (error) 2051 return (error); 2052 2053 INP_WLOCK_RECHECK(inp); 2054 error = tcp_log_state_change(tp, optval); 2055 goto unlock_and_done; 2056 2057 case TCP_LOGBUF: 2058 INP_WUNLOCK(inp); 2059 error = EINVAL; 2060 break; 2061 2062 case TCP_LOGID: 2063 INP_WUNLOCK(inp); 2064 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2065 if (error) 2066 break; 2067 buf[sopt->sopt_valsize] = '\0'; 2068 INP_WLOCK_RECHECK(inp); 2069 error = tcp_log_set_id(tp, buf); 2070 /* tcp_log_set_id() unlocks the INP. */ 2071 break; 2072 2073 case TCP_LOGDUMP: 2074 case TCP_LOGDUMPID: 2075 INP_WUNLOCK(inp); 2076 error = 2077 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2078 if (error) 2079 break; 2080 buf[sopt->sopt_valsize] = '\0'; 2081 INP_WLOCK_RECHECK(inp); 2082 if (sopt->sopt_name == TCP_LOGDUMP) { 2083 error = tcp_log_dump_tp_logbuf(tp, buf, 2084 M_WAITOK, true); 2085 INP_WUNLOCK(inp); 2086 } else { 2087 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2088 /* 2089 * tcp_log_dump_tp_bucket_logbufs() drops the 2090 * INP lock. 2091 */ 2092 } 2093 break; 2094 #endif 2095 2096 default: 2097 INP_WUNLOCK(inp); 2098 error = ENOPROTOOPT; 2099 break; 2100 } 2101 break; 2102 2103 case SOPT_GET: 2104 tp = intotcpcb(inp); 2105 switch (sopt->sopt_name) { 2106 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2107 case TCP_MD5SIG: 2108 if (!TCPMD5_ENABLED()) { 2109 INP_WUNLOCK(inp); 2110 return (ENOPROTOOPT); 2111 } 2112 error = TCPMD5_PCBCTL(inp, sopt); 2113 break; 2114 #endif 2115 2116 case TCP_NODELAY: 2117 optval = tp->t_flags & TF_NODELAY; 2118 INP_WUNLOCK(inp); 2119 error = sooptcopyout(sopt, &optval, sizeof optval); 2120 break; 2121 case TCP_MAXSEG: 2122 optval = tp->t_maxseg; 2123 INP_WUNLOCK(inp); 2124 error = sooptcopyout(sopt, &optval, sizeof optval); 2125 break; 2126 case TCP_NOOPT: 2127 optval = tp->t_flags & TF_NOOPT; 2128 INP_WUNLOCK(inp); 2129 error = sooptcopyout(sopt, &optval, sizeof optval); 2130 break; 2131 case TCP_NOPUSH: 2132 optval = tp->t_flags & TF_NOPUSH; 2133 INP_WUNLOCK(inp); 2134 error = sooptcopyout(sopt, &optval, sizeof optval); 2135 break; 2136 case TCP_INFO: 2137 tcp_fill_info(tp, &ti); 2138 INP_WUNLOCK(inp); 2139 error = sooptcopyout(sopt, &ti, sizeof ti); 2140 break; 2141 case TCP_CONGESTION: 2142 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2143 INP_WUNLOCK(inp); 2144 error = sooptcopyout(sopt, buf, len + 1); 2145 break; 2146 case TCP_KEEPIDLE: 2147 case TCP_KEEPINTVL: 2148 case TCP_KEEPINIT: 2149 case TCP_KEEPCNT: 2150 switch (sopt->sopt_name) { 2151 case TCP_KEEPIDLE: 2152 ui = TP_KEEPIDLE(tp) / hz; 2153 break; 2154 case TCP_KEEPINTVL: 2155 ui = TP_KEEPINTVL(tp) / hz; 2156 break; 2157 case TCP_KEEPINIT: 2158 ui = TP_KEEPINIT(tp) / hz; 2159 break; 2160 case TCP_KEEPCNT: 2161 ui = TP_KEEPCNT(tp); 2162 break; 2163 } 2164 INP_WUNLOCK(inp); 2165 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2166 break; 2167 #ifdef TCPPCAP 2168 case TCP_PCAP_OUT: 2169 case TCP_PCAP_IN: 2170 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2171 &(tp->t_outpkts) : &(tp->t_inpkts)); 2172 INP_WUNLOCK(inp); 2173 error = sooptcopyout(sopt, &optval, sizeof optval); 2174 break; 2175 #endif 2176 case TCP_FASTOPEN: 2177 optval = tp->t_flags & TF_FASTOPEN; 2178 INP_WUNLOCK(inp); 2179 error = sooptcopyout(sopt, &optval, sizeof optval); 2180 break; 2181 #ifdef TCP_BLACKBOX 2182 case TCP_LOG: 2183 optval = tp->t_logstate; 2184 INP_WUNLOCK(inp); 2185 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2186 break; 2187 case TCP_LOGBUF: 2188 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2189 error = tcp_log_getlogbuf(sopt, tp); 2190 break; 2191 case TCP_LOGID: 2192 len = tcp_log_get_id(tp, buf); 2193 INP_WUNLOCK(inp); 2194 error = sooptcopyout(sopt, buf, len + 1); 2195 break; 2196 case TCP_LOGDUMP: 2197 case TCP_LOGDUMPID: 2198 INP_WUNLOCK(inp); 2199 error = EINVAL; 2200 break; 2201 #endif 2202 default: 2203 INP_WUNLOCK(inp); 2204 error = ENOPROTOOPT; 2205 break; 2206 } 2207 break; 2208 } 2209 return (error); 2210 } 2211 #undef INP_WLOCK_RECHECK 2212 #undef INP_WLOCK_RECHECK_CLEANUP 2213 2214 /* 2215 * Attach TCP protocol to socket, allocating 2216 * internet protocol control block, tcp control block, 2217 * bufer space, and entering LISTEN state if to accept connections. 2218 */ 2219 static int 2220 tcp_attach(struct socket *so) 2221 { 2222 struct tcpcb *tp; 2223 struct inpcb *inp; 2224 struct epoch_tracker et; 2225 int error; 2226 2227 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 2228 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 2229 if (error) 2230 return (error); 2231 } 2232 so->so_rcv.sb_flags |= SB_AUTOSIZE; 2233 so->so_snd.sb_flags |= SB_AUTOSIZE; 2234 INP_INFO_RLOCK_ET(&V_tcbinfo, et); 2235 error = in_pcballoc(so, &V_tcbinfo); 2236 if (error) { 2237 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 2238 return (error); 2239 } 2240 inp = sotoinpcb(so); 2241 #ifdef INET6 2242 if (inp->inp_vflag & INP_IPV6PROTO) { 2243 inp->inp_vflag |= INP_IPV6; 2244 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 2245 inp->inp_vflag |= INP_IPV4; 2246 inp->in6p_hops = -1; /* use kernel default */ 2247 } 2248 else 2249 #endif 2250 inp->inp_vflag |= INP_IPV4; 2251 tp = tcp_newtcpcb(inp); 2252 if (tp == NULL) { 2253 in_pcbdetach(inp); 2254 in_pcbfree(inp); 2255 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 2256 return (ENOBUFS); 2257 } 2258 tp->t_state = TCPS_CLOSED; 2259 INP_WUNLOCK(inp); 2260 INP_INFO_RUNLOCK_ET(&V_tcbinfo, et); 2261 TCPSTATES_INC(TCPS_CLOSED); 2262 return (0); 2263 } 2264 2265 /* 2266 * Initiate (or continue) disconnect. 2267 * If embryonic state, just send reset (once). 2268 * If in ``let data drain'' option and linger null, just drop. 2269 * Otherwise (hard), mark socket disconnecting and drop 2270 * current input data; switch states based on user close, and 2271 * send segment to peer (with FIN). 2272 */ 2273 static void 2274 tcp_disconnect(struct tcpcb *tp) 2275 { 2276 struct inpcb *inp = tp->t_inpcb; 2277 struct socket *so = inp->inp_socket; 2278 2279 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 2280 INP_WLOCK_ASSERT(inp); 2281 2282 /* 2283 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2284 * socket is still open. 2285 */ 2286 if (tp->t_state < TCPS_ESTABLISHED && 2287 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2288 tp = tcp_close(tp); 2289 KASSERT(tp != NULL, 2290 ("tcp_disconnect: tcp_close() returned NULL")); 2291 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2292 tp = tcp_drop(tp, 0); 2293 KASSERT(tp != NULL, 2294 ("tcp_disconnect: tcp_drop() returned NULL")); 2295 } else { 2296 soisdisconnecting(so); 2297 sbflush(&so->so_rcv); 2298 tcp_usrclosed(tp); 2299 if (!(inp->inp_flags & INP_DROPPED)) 2300 tp->t_fb->tfb_tcp_output(tp); 2301 } 2302 } 2303 2304 /* 2305 * User issued close, and wish to trail through shutdown states: 2306 * if never received SYN, just forget it. If got a SYN from peer, 2307 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2308 * If already got a FIN from peer, then almost done; go to LAST_ACK 2309 * state. In all other cases, have already sent FIN to peer (e.g. 2310 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2311 * for peer to send FIN or not respond to keep-alives, etc. 2312 * We can let the user exit from the close as soon as the FIN is acked. 2313 */ 2314 static void 2315 tcp_usrclosed(struct tcpcb *tp) 2316 { 2317 2318 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 2319 INP_WLOCK_ASSERT(tp->t_inpcb); 2320 2321 switch (tp->t_state) { 2322 case TCPS_LISTEN: 2323 #ifdef TCP_OFFLOAD 2324 tcp_offload_listen_stop(tp); 2325 #endif 2326 tcp_state_change(tp, TCPS_CLOSED); 2327 /* FALLTHROUGH */ 2328 case TCPS_CLOSED: 2329 tp = tcp_close(tp); 2330 /* 2331 * tcp_close() should never return NULL here as the socket is 2332 * still open. 2333 */ 2334 KASSERT(tp != NULL, 2335 ("tcp_usrclosed: tcp_close() returned NULL")); 2336 break; 2337 2338 case TCPS_SYN_SENT: 2339 case TCPS_SYN_RECEIVED: 2340 tp->t_flags |= TF_NEEDFIN; 2341 break; 2342 2343 case TCPS_ESTABLISHED: 2344 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2345 break; 2346 2347 case TCPS_CLOSE_WAIT: 2348 tcp_state_change(tp, TCPS_LAST_ACK); 2349 break; 2350 } 2351 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2352 soisdisconnected(tp->t_inpcb->inp_socket); 2353 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2354 if (tp->t_state == TCPS_FIN_WAIT_2) { 2355 int timeout; 2356 2357 timeout = (tcp_fast_finwait2_recycle) ? 2358 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2359 tcp_timer_activate(tp, TT_2MSL, timeout); 2360 } 2361 } 2362 } 2363 2364 #ifdef DDB 2365 static void 2366 db_print_indent(int indent) 2367 { 2368 int i; 2369 2370 for (i = 0; i < indent; i++) 2371 db_printf(" "); 2372 } 2373 2374 static void 2375 db_print_tstate(int t_state) 2376 { 2377 2378 switch (t_state) { 2379 case TCPS_CLOSED: 2380 db_printf("TCPS_CLOSED"); 2381 return; 2382 2383 case TCPS_LISTEN: 2384 db_printf("TCPS_LISTEN"); 2385 return; 2386 2387 case TCPS_SYN_SENT: 2388 db_printf("TCPS_SYN_SENT"); 2389 return; 2390 2391 case TCPS_SYN_RECEIVED: 2392 db_printf("TCPS_SYN_RECEIVED"); 2393 return; 2394 2395 case TCPS_ESTABLISHED: 2396 db_printf("TCPS_ESTABLISHED"); 2397 return; 2398 2399 case TCPS_CLOSE_WAIT: 2400 db_printf("TCPS_CLOSE_WAIT"); 2401 return; 2402 2403 case TCPS_FIN_WAIT_1: 2404 db_printf("TCPS_FIN_WAIT_1"); 2405 return; 2406 2407 case TCPS_CLOSING: 2408 db_printf("TCPS_CLOSING"); 2409 return; 2410 2411 case TCPS_LAST_ACK: 2412 db_printf("TCPS_LAST_ACK"); 2413 return; 2414 2415 case TCPS_FIN_WAIT_2: 2416 db_printf("TCPS_FIN_WAIT_2"); 2417 return; 2418 2419 case TCPS_TIME_WAIT: 2420 db_printf("TCPS_TIME_WAIT"); 2421 return; 2422 2423 default: 2424 db_printf("unknown"); 2425 return; 2426 } 2427 } 2428 2429 static void 2430 db_print_tflags(u_int t_flags) 2431 { 2432 int comma; 2433 2434 comma = 0; 2435 if (t_flags & TF_ACKNOW) { 2436 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2437 comma = 1; 2438 } 2439 if (t_flags & TF_DELACK) { 2440 db_printf("%sTF_DELACK", comma ? ", " : ""); 2441 comma = 1; 2442 } 2443 if (t_flags & TF_NODELAY) { 2444 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2445 comma = 1; 2446 } 2447 if (t_flags & TF_NOOPT) { 2448 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2449 comma = 1; 2450 } 2451 if (t_flags & TF_SENTFIN) { 2452 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2453 comma = 1; 2454 } 2455 if (t_flags & TF_REQ_SCALE) { 2456 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2457 comma = 1; 2458 } 2459 if (t_flags & TF_RCVD_SCALE) { 2460 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2461 comma = 1; 2462 } 2463 if (t_flags & TF_REQ_TSTMP) { 2464 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2465 comma = 1; 2466 } 2467 if (t_flags & TF_RCVD_TSTMP) { 2468 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2469 comma = 1; 2470 } 2471 if (t_flags & TF_SACK_PERMIT) { 2472 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2473 comma = 1; 2474 } 2475 if (t_flags & TF_NEEDSYN) { 2476 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2477 comma = 1; 2478 } 2479 if (t_flags & TF_NEEDFIN) { 2480 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2481 comma = 1; 2482 } 2483 if (t_flags & TF_NOPUSH) { 2484 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2485 comma = 1; 2486 } 2487 if (t_flags & TF_MORETOCOME) { 2488 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2489 comma = 1; 2490 } 2491 if (t_flags & TF_LQ_OVERFLOW) { 2492 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2493 comma = 1; 2494 } 2495 if (t_flags & TF_LASTIDLE) { 2496 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2497 comma = 1; 2498 } 2499 if (t_flags & TF_RXWIN0SENT) { 2500 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2501 comma = 1; 2502 } 2503 if (t_flags & TF_FASTRECOVERY) { 2504 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2505 comma = 1; 2506 } 2507 if (t_flags & TF_CONGRECOVERY) { 2508 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2509 comma = 1; 2510 } 2511 if (t_flags & TF_WASFRECOVERY) { 2512 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2513 comma = 1; 2514 } 2515 if (t_flags & TF_SIGNATURE) { 2516 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2517 comma = 1; 2518 } 2519 if (t_flags & TF_FORCEDATA) { 2520 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2521 comma = 1; 2522 } 2523 if (t_flags & TF_TSO) { 2524 db_printf("%sTF_TSO", comma ? ", " : ""); 2525 comma = 1; 2526 } 2527 if (t_flags & TF_ECN_PERMIT) { 2528 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2529 comma = 1; 2530 } 2531 if (t_flags & TF_FASTOPEN) { 2532 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2533 comma = 1; 2534 } 2535 } 2536 2537 static void 2538 db_print_toobflags(char t_oobflags) 2539 { 2540 int comma; 2541 2542 comma = 0; 2543 if (t_oobflags & TCPOOB_HAVEDATA) { 2544 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2545 comma = 1; 2546 } 2547 if (t_oobflags & TCPOOB_HADDATA) { 2548 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2549 comma = 1; 2550 } 2551 } 2552 2553 static void 2554 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2555 { 2556 2557 db_print_indent(indent); 2558 db_printf("%s at %p\n", name, tp); 2559 2560 indent += 2; 2561 2562 db_print_indent(indent); 2563 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2564 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2565 2566 db_print_indent(indent); 2567 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2568 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2569 2570 db_print_indent(indent); 2571 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2572 &tp->t_timers->tt_delack, tp->t_inpcb); 2573 2574 db_print_indent(indent); 2575 db_printf("t_state: %d (", tp->t_state); 2576 db_print_tstate(tp->t_state); 2577 db_printf(")\n"); 2578 2579 db_print_indent(indent); 2580 db_printf("t_flags: 0x%x (", tp->t_flags); 2581 db_print_tflags(tp->t_flags); 2582 db_printf(")\n"); 2583 2584 db_print_indent(indent); 2585 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2586 tp->snd_una, tp->snd_max, tp->snd_nxt); 2587 2588 db_print_indent(indent); 2589 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2590 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2591 2592 db_print_indent(indent); 2593 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2594 tp->iss, tp->irs, tp->rcv_nxt); 2595 2596 db_print_indent(indent); 2597 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2598 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2599 2600 db_print_indent(indent); 2601 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2602 tp->snd_wnd, tp->snd_cwnd); 2603 2604 db_print_indent(indent); 2605 db_printf("snd_ssthresh: %u snd_recover: " 2606 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2607 2608 db_print_indent(indent); 2609 db_printf("t_rcvtime: %u t_startime: %u\n", 2610 tp->t_rcvtime, tp->t_starttime); 2611 2612 db_print_indent(indent); 2613 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2614 tp->t_rtttime, tp->t_rtseq); 2615 2616 db_print_indent(indent); 2617 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2618 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2619 2620 db_print_indent(indent); 2621 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2622 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2623 tp->t_rttbest); 2624 2625 db_print_indent(indent); 2626 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2627 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2628 2629 db_print_indent(indent); 2630 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2631 db_print_toobflags(tp->t_oobflags); 2632 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2633 2634 db_print_indent(indent); 2635 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2636 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2637 2638 db_print_indent(indent); 2639 db_printf("ts_recent: %u ts_recent_age: %u\n", 2640 tp->ts_recent, tp->ts_recent_age); 2641 2642 db_print_indent(indent); 2643 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2644 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2645 2646 db_print_indent(indent); 2647 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2648 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2649 tp->snd_recover_prev, tp->t_badrxtwin); 2650 2651 db_print_indent(indent); 2652 db_printf("snd_numholes: %d snd_holes first: %p\n", 2653 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2654 2655 db_print_indent(indent); 2656 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2657 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2658 2659 /* Skip sackblks, sackhint. */ 2660 2661 db_print_indent(indent); 2662 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2663 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2664 } 2665 2666 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2667 { 2668 struct tcpcb *tp; 2669 2670 if (!have_addr) { 2671 db_printf("usage: show tcpcb <addr>\n"); 2672 return; 2673 } 2674 tp = (struct tcpcb *)addr; 2675 2676 db_print_tcpcb(tp, "tcpcb", 0); 2677 } 2678 #endif
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