1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. 6 * Copyright (c) 2006-2007 Robert N. M. Watson 7 * Copyright (c) 2010-2011 Juniper Networks, Inc. 8 * All rights reserved. 9 * 10 * Portions of this software were developed by Robert N. M. Watson under 11 * contract to Juniper Networks, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 38 */ 39 40#include <sys/cdefs.h> 41__FBSDID("$FreeBSD$"); 42 43#include "opt_ddb.h" 44#include "opt_inet.h" 45#include "opt_inet6.h" 46#include "opt_ipsec.h" 47#include "opt_kern_tls.h" 48#include "opt_tcpdebug.h" 49 50#include <sys/param.h> 51#include <sys/systm.h> 52#include <sys/arb.h> 53#include <sys/limits.h> 54#include <sys/malloc.h> 55#include <sys/refcount.h> 56#include <sys/kernel.h> 57#include <sys/ktls.h> 58#include <sys/qmath.h> 59#include <sys/sysctl.h> 60#include <sys/mbuf.h> 61#ifdef INET6 62#include <sys/domain.h> 63#endif /* INET6 */ 64#include <sys/socket.h> 65#include <sys/socketvar.h> 66#include <sys/protosw.h> 67#include <sys/proc.h> 68#include <sys/jail.h> 69#include <sys/syslog.h> 70#include <sys/stats.h> 71 72#ifdef DDB 73#include <ddb/ddb.h> 74#endif 75 76#include <net/if.h> 77#include <net/if_var.h> 78#include <net/route.h> 79#include <net/vnet.h> 80 81#include <netinet/in.h> 82#include <netinet/in_kdtrace.h> 83#include <netinet/in_pcb.h> 84#include <netinet/in_systm.h> 85#include <netinet/in_var.h> 86#include <netinet/ip_var.h> 87#ifdef INET6 88#include <netinet/ip6.h> 89#include <netinet6/in6_pcb.h> 90#include <netinet6/ip6_var.h> 91#include <netinet6/scope6_var.h> 92#endif 93#include <netinet/tcp.h> 94#include <netinet/tcp_fsm.h> 95#include <netinet/tcp_seq.h> 96#include <netinet/tcp_timer.h> 97#include <netinet/tcp_var.h> 98#include <netinet/tcp_log_buf.h> 99#include <netinet/tcpip.h> 100#include <netinet/cc/cc.h> 101#include <netinet/tcp_fastopen.h> 102#include <netinet/tcp_hpts.h> 103#ifdef TCPPCAP 104#include <netinet/tcp_pcap.h> 105#endif 106#ifdef TCPDEBUG 107#include <netinet/tcp_debug.h> 108#endif 109#ifdef TCP_OFFLOAD 110#include <netinet/tcp_offload.h> 111#endif 112#include <netipsec/ipsec_support.h> 113 114#include <vm/vm.h> 115#include <vm/vm_param.h> 116#include <vm/pmap.h> 117#include <vm/vm_extern.h> 118#include <vm/vm_map.h> 119#include <vm/vm_page.h> 120 121/* 122 * TCP protocol interface to socket abstraction. 123 */ 124#ifdef INET 125static int tcp_connect(struct tcpcb *, struct sockaddr *, 126 struct thread *td); 127#endif /* INET */ 128#ifdef INET6 129static int tcp6_connect(struct tcpcb *, struct sockaddr *, 130 struct thread *td); 131#endif /* INET6 */ 132static void tcp_disconnect(struct tcpcb *); 133static void tcp_usrclosed(struct tcpcb *); 134static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 135 136static int tcp_pru_options_support(struct tcpcb *tp, int flags); 137 138#ifdef TCPDEBUG 139#define TCPDEBUG0 int ostate = 0 140#define TCPDEBUG1() ostate = tp ? tp->t_state : 0 141#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 142 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 143#else 144#define TCPDEBUG0 145#define TCPDEBUG1() 146#define TCPDEBUG2(req) 147#endif 148 149/* 150 * tcp_require_unique port requires a globally-unique source port for each 151 * outgoing connection. The default is to require the 4-tuple to be unique. 152 */ 153VNET_DEFINE(int, tcp_require_unique_port) = 0; 154SYSCTL_INT(_net_inet_tcp, OID_AUTO, require_unique_port, 155 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_require_unique_port), 0, 156 "Require globally-unique ephemeral port for outgoing connections"); 157#define V_tcp_require_unique_port VNET(tcp_require_unique_port) 158 159/* 160 * TCP attaches to socket via pru_attach(), reserving space, 161 * and an internet control block. 162 */ 163static int 164tcp_usr_attach(struct socket *so, int proto, struct thread *td) 165{ 166 struct inpcb *inp; 167 struct tcpcb *tp = NULL; 168 int error; 169 TCPDEBUG0; 170 171 inp = sotoinpcb(so); 172 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 173 TCPDEBUG1(); 174 175 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 176 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 177 if (error) 178 goto out; 179 } 180 181 so->so_rcv.sb_flags |= SB_AUTOSIZE; 182 so->so_snd.sb_flags |= SB_AUTOSIZE; 183 error = in_pcballoc(so, &V_tcbinfo); 184 if (error) 185 goto out; 186 inp = sotoinpcb(so); 187#ifdef INET6 188 if (inp->inp_vflag & INP_IPV6PROTO) { 189 inp->inp_vflag |= INP_IPV6; 190 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 191 inp->inp_vflag |= INP_IPV4; 192 inp->in6p_hops = -1; /* use kernel default */ 193 } 194 else 195#endif 196 inp->inp_vflag |= INP_IPV4; 197 tp = tcp_newtcpcb(inp); 198 if (tp == NULL) { 199 error = ENOBUFS; 200 in_pcbdetach(inp); 201 in_pcbfree(inp); 202 goto out; 203 } 204 tp->t_state = TCPS_CLOSED; 205 INP_WUNLOCK(inp); 206 TCPSTATES_INC(TCPS_CLOSED); 207out: 208 TCPDEBUG2(PRU_ATTACH); 209 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 210 return (error); 211} 212 213/* 214 * tcp_usr_detach is called when the socket layer loses its final reference 215 * to the socket, be it a file descriptor reference, a reference from TCP, 216 * etc. At this point, there is only one case in which we will keep around 217 * inpcb state: time wait. 218 */ 219static void 220tcp_usr_detach(struct socket *so) 221{ 222 struct inpcb *inp; 223 struct tcpcb *tp; 224 225 inp = sotoinpcb(so); 226 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 227 INP_WLOCK(inp); 228 KASSERT(so->so_pcb == inp && inp->inp_socket == so, 229 ("%s: socket %p inp %p mismatch", __func__, so, inp)); 230 231 tp = intotcpcb(inp); 232 233 if (inp->inp_flags & INP_TIMEWAIT) { 234 /* 235 * There are two cases to handle: one in which the time wait 236 * state is being discarded (INP_DROPPED), and one in which 237 * this connection will remain in timewait. In the former, 238 * it is time to discard all state (except tcptw, which has 239 * already been discarded by the timewait close code, which 240 * should be further up the call stack somewhere). In the 241 * latter case, we detach from the socket, but leave the pcb 242 * present until timewait ends. 243 * 244 * XXXRW: Would it be cleaner to free the tcptw here? 245 * 246 * Astute question indeed, from twtcp perspective there are 247 * four cases to consider: 248 * 249 * #1 tcp_usr_detach is called at tcptw creation time by 250 * tcp_twstart, then do not discard the newly created tcptw 251 * and leave inpcb present until timewait ends 252 * #2 tcp_usr_detach is called at tcptw creation time by 253 * tcp_twstart, but connection is local and tw will be 254 * discarded immediately 255 * #3 tcp_usr_detach is called at timewait end (or reuse) by 256 * tcp_twclose, then the tcptw has already been discarded 257 * (or reused) and inpcb is freed here 258 * #4 tcp_usr_detach is called() after timewait ends (or reuse) 259 * (e.g. by soclose), then tcptw has already been discarded 260 * (or reused) and inpcb is freed here 261 * 262 * In all three cases the tcptw should not be freed here. 263 */ 264 if (inp->inp_flags & INP_DROPPED) { 265 in_pcbdetach(inp); 266 if (__predict_true(tp == NULL)) { 267 in_pcbfree(inp); 268 } else { 269 /* 270 * This case should not happen as in TIMEWAIT 271 * state the inp should not be destroyed before 272 * its tcptw. If INVARIANTS is defined, panic. 273 */ 274#ifdef INVARIANTS 275 panic("%s: Panic before an inp double-free: " 276 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 277 , __func__); 278#else 279 log(LOG_ERR, "%s: Avoid an inp double-free: " 280 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 281 , __func__); 282#endif 283 INP_WUNLOCK(inp); 284 } 285 } else { 286 in_pcbdetach(inp); 287 INP_WUNLOCK(inp); 288 } 289 } else { 290 /* 291 * If the connection is not in timewait, we consider two 292 * two conditions: one in which no further processing is 293 * necessary (dropped || embryonic), and one in which TCP is 294 * not yet done, but no longer requires the socket, so the 295 * pcb will persist for the time being. 296 * 297 * XXXRW: Does the second case still occur? 298 */ 299 if (inp->inp_flags & INP_DROPPED || 300 tp->t_state < TCPS_SYN_SENT) { 301 tcp_discardcb(tp); 302 in_pcbdetach(inp); 303 in_pcbfree(inp); 304 } else { 305 in_pcbdetach(inp); 306 INP_WUNLOCK(inp); 307 } 308 } 309} 310 311#ifdef INET 312/* 313 * Give the socket an address. 314 */ 315static int 316tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 317{ 318 int error = 0; 319 struct inpcb *inp; 320 struct tcpcb *tp = NULL; 321 struct sockaddr_in *sinp; 322 323 sinp = (struct sockaddr_in *)nam; 324 if (nam->sa_family != AF_INET) { 325 /* 326 * Preserve compatibility with old programs. 327 */ 328 if (nam->sa_family != AF_UNSPEC || 329 sinp->sin_addr.s_addr != INADDR_ANY) 330 return (EAFNOSUPPORT); 331 nam->sa_family = AF_INET; 332 } 333 if (nam->sa_len != sizeof(*sinp)) 334 return (EINVAL); 335 336 /* 337 * Must check for multicast addresses and disallow binding 338 * to them. 339 */ 340 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 341 return (EAFNOSUPPORT); 342 343 TCPDEBUG0; 344 inp = sotoinpcb(so); 345 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 346 INP_WLOCK(inp); 347 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 348 error = EINVAL; 349 goto out; 350 } 351 tp = intotcpcb(inp); 352 TCPDEBUG1(); 353 INP_HASH_WLOCK(&V_tcbinfo); 354 error = in_pcbbind(inp, nam, td->td_ucred); 355 INP_HASH_WUNLOCK(&V_tcbinfo); 356out: 357 TCPDEBUG2(PRU_BIND); 358 TCP_PROBE2(debug__user, tp, PRU_BIND); 359 INP_WUNLOCK(inp); 360 361 return (error); 362} 363#endif /* INET */ 364 365#ifdef INET6 366static int 367tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 368{ 369 int error = 0; 370 struct inpcb *inp; 371 struct tcpcb *tp = NULL; 372 struct sockaddr_in6 *sin6; 373 u_char vflagsav; 374 375 sin6 = (struct sockaddr_in6 *)nam; 376 if (nam->sa_family != AF_INET6) 377 return (EAFNOSUPPORT); 378 if (nam->sa_len != sizeof(*sin6)) 379 return (EINVAL); 380 381 /* 382 * Must check for multicast addresses and disallow binding 383 * to them. 384 */ 385 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 386 return (EAFNOSUPPORT); 387 388 TCPDEBUG0; 389 inp = sotoinpcb(so); 390 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 391 INP_WLOCK(inp); 392 vflagsav = inp->inp_vflag; 393 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 394 error = EINVAL; 395 goto out; 396 } 397 tp = intotcpcb(inp); 398 TCPDEBUG1(); 399 INP_HASH_WLOCK(&V_tcbinfo); 400 inp->inp_vflag &= ~INP_IPV4; 401 inp->inp_vflag |= INP_IPV6; 402#ifdef INET 403 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 404 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 405 inp->inp_vflag |= INP_IPV4; 406 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 407 struct sockaddr_in sin; 408 409 in6_sin6_2_sin(&sin, sin6); 410 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 411 error = EAFNOSUPPORT; 412 INP_HASH_WUNLOCK(&V_tcbinfo); 413 goto out; 414 } 415 inp->inp_vflag |= INP_IPV4; 416 inp->inp_vflag &= ~INP_IPV6; 417 error = in_pcbbind(inp, (struct sockaddr *)&sin, 418 td->td_ucred); 419 INP_HASH_WUNLOCK(&V_tcbinfo); 420 goto out; 421 } 422 } 423#endif 424 error = in6_pcbbind(inp, nam, td->td_ucred); 425 INP_HASH_WUNLOCK(&V_tcbinfo); 426out: 427 if (error != 0) 428 inp->inp_vflag = vflagsav; 429 TCPDEBUG2(PRU_BIND); 430 TCP_PROBE2(debug__user, tp, PRU_BIND); 431 INP_WUNLOCK(inp); 432 return (error); 433} 434#endif /* INET6 */ 435 436#ifdef INET 437/* 438 * Prepare to accept connections. 439 */ 440static int 441tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 442{ 443 int error = 0; 444 struct inpcb *inp; 445 struct tcpcb *tp = NULL; 446 447 TCPDEBUG0; 448 inp = sotoinpcb(so); 449 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 450 INP_WLOCK(inp); 451 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 452 error = EINVAL; 453 goto out; 454 } 455 tp = intotcpcb(inp); 456 TCPDEBUG1(); 457 SOCK_LOCK(so); 458 error = solisten_proto_check(so); 459 INP_HASH_WLOCK(&V_tcbinfo); 460 if (error == 0 && inp->inp_lport == 0) 461 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 462 INP_HASH_WUNLOCK(&V_tcbinfo); 463 if (error == 0) { 464 tcp_state_change(tp, TCPS_LISTEN); 465 solisten_proto(so, backlog); 466#ifdef TCP_OFFLOAD 467 if ((so->so_options & SO_NO_OFFLOAD) == 0) 468 tcp_offload_listen_start(tp); 469#endif 470 } 471 SOCK_UNLOCK(so); 472 473 if (IS_FASTOPEN(tp->t_flags)) 474 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 475 476out: 477 TCPDEBUG2(PRU_LISTEN); 478 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 479 INP_WUNLOCK(inp); 480 return (error); 481} 482#endif /* INET */ 483 484#ifdef INET6 485static int 486tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 487{ 488 int error = 0; 489 struct inpcb *inp; 490 struct tcpcb *tp = NULL; 491 u_char vflagsav; 492 493 TCPDEBUG0; 494 inp = sotoinpcb(so); 495 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 496 INP_WLOCK(inp); 497 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 498 error = EINVAL; 499 goto out; 500 } 501 vflagsav = inp->inp_vflag; 502 tp = intotcpcb(inp); 503 TCPDEBUG1(); 504 SOCK_LOCK(so); 505 error = solisten_proto_check(so); 506 INP_HASH_WLOCK(&V_tcbinfo); 507 if (error == 0 && inp->inp_lport == 0) { 508 inp->inp_vflag &= ~INP_IPV4; 509 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 510 inp->inp_vflag |= INP_IPV4; 511 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 512 } 513 INP_HASH_WUNLOCK(&V_tcbinfo); 514 if (error == 0) { 515 tcp_state_change(tp, TCPS_LISTEN); 516 solisten_proto(so, backlog); 517#ifdef TCP_OFFLOAD 518 if ((so->so_options & SO_NO_OFFLOAD) == 0) 519 tcp_offload_listen_start(tp); 520#endif 521 } 522 SOCK_UNLOCK(so); 523 524 if (IS_FASTOPEN(tp->t_flags)) 525 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 526 527 if (error != 0) 528 inp->inp_vflag = vflagsav; 529 530out: 531 TCPDEBUG2(PRU_LISTEN); 532 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 533 INP_WUNLOCK(inp); 534 return (error); 535} 536#endif /* INET6 */ 537 538#ifdef INET 539/* 540 * Initiate connection to peer. 541 * Create a template for use in transmissions on this connection. 542 * Enter SYN_SENT state, and mark socket as connecting. 543 * Start keep-alive timer, and seed output sequence space. 544 * Send initial segment on connection. 545 */ 546static int 547tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 548{ 549 struct epoch_tracker et; 550 int error = 0; 551 struct inpcb *inp; 552 struct tcpcb *tp = NULL; 553 struct sockaddr_in *sinp; 554 555 sinp = (struct sockaddr_in *)nam; 556 if (nam->sa_family != AF_INET) 557 return (EAFNOSUPPORT); 558 if (nam->sa_len != sizeof (*sinp)) 559 return (EINVAL); 560 561 /* 562 * Must disallow TCP ``connections'' to multicast addresses. 563 */ 564 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 565 return (EAFNOSUPPORT); 566 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) 567 return (EACCES); 568 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 569 return (error); 570 571 TCPDEBUG0; 572 inp = sotoinpcb(so); 573 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 574 INP_WLOCK(inp); 575 if (inp->inp_flags & INP_TIMEWAIT) { 576 error = EADDRINUSE; 577 goto out; 578 } 579 if (inp->inp_flags & INP_DROPPED) { 580 error = ECONNREFUSED; 581 goto out; 582 } 583 tp = intotcpcb(inp); 584 TCPDEBUG1(); 585 NET_EPOCH_ENTER(et); 586 if ((error = tcp_connect(tp, nam, td)) != 0) 587 goto out_in_epoch; 588#ifdef TCP_OFFLOAD 589 if (registered_toedevs > 0 && 590 (so->so_options & SO_NO_OFFLOAD) == 0 && 591 (error = tcp_offload_connect(so, nam)) == 0) 592 goto out_in_epoch; 593#endif 594 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 595 error = tp->t_fb->tfb_tcp_output(tp); 596out_in_epoch: 597 NET_EPOCH_EXIT(et); 598out: 599 TCPDEBUG2(PRU_CONNECT); 600 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 601 INP_WUNLOCK(inp); 602 return (error); 603} 604#endif /* INET */ 605 606#ifdef INET6 607static int 608tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 609{ 610 struct epoch_tracker et; 611 int error = 0; 612 struct inpcb *inp; 613 struct tcpcb *tp = NULL; 614 struct sockaddr_in6 *sin6; 615 u_int8_t incflagsav; 616 u_char vflagsav; 617 618 TCPDEBUG0; 619 620 sin6 = (struct sockaddr_in6 *)nam; 621 if (nam->sa_family != AF_INET6) 622 return (EAFNOSUPPORT); 623 if (nam->sa_len != sizeof (*sin6)) 624 return (EINVAL); 625 626 /* 627 * Must disallow TCP ``connections'' to multicast addresses. 628 */ 629 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 630 return (EAFNOSUPPORT); 631 632 inp = sotoinpcb(so); 633 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 634 INP_WLOCK(inp); 635 vflagsav = inp->inp_vflag; 636 incflagsav = inp->inp_inc.inc_flags; 637 if (inp->inp_flags & INP_TIMEWAIT) { 638 error = EADDRINUSE; 639 goto out; 640 } 641 if (inp->inp_flags & INP_DROPPED) { 642 error = ECONNREFUSED; 643 goto out; 644 } 645 tp = intotcpcb(inp); 646 TCPDEBUG1(); 647#ifdef INET 648 /* 649 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 650 * therefore probably require the hash lock, which isn't held here. 651 * Is this a significant problem? 652 */ 653 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 654 struct sockaddr_in sin; 655 656 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 657 error = EINVAL; 658 goto out; 659 } 660 if ((inp->inp_vflag & INP_IPV4) == 0) { 661 error = EAFNOSUPPORT; 662 goto out; 663 } 664 665 in6_sin6_2_sin(&sin, sin6); 666 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 667 error = EAFNOSUPPORT; 668 goto out; 669 } 670 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) { 671 error = EACCES; 672 goto out; 673 } 674 if ((error = prison_remote_ip4(td->td_ucred, 675 &sin.sin_addr)) != 0) 676 goto out; 677 inp->inp_vflag |= INP_IPV4; 678 inp->inp_vflag &= ~INP_IPV6; 679 NET_EPOCH_ENTER(et); 680 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 681 goto out_in_epoch; 682#ifdef TCP_OFFLOAD 683 if (registered_toedevs > 0 && 684 (so->so_options & SO_NO_OFFLOAD) == 0 && 685 (error = tcp_offload_connect(so, nam)) == 0) 686 goto out_in_epoch; 687#endif 688 error = tp->t_fb->tfb_tcp_output(tp); 689 goto out_in_epoch; 690 } else { 691 if ((inp->inp_vflag & INP_IPV6) == 0) { 692 error = EAFNOSUPPORT; 693 goto out; 694 } 695 } 696#endif 697 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 698 goto out; 699 inp->inp_vflag &= ~INP_IPV4; 700 inp->inp_vflag |= INP_IPV6; 701 inp->inp_inc.inc_flags |= INC_ISIPV6; 702 if ((error = tcp6_connect(tp, nam, td)) != 0) 703 goto out; 704#ifdef TCP_OFFLOAD 705 if (registered_toedevs > 0 && 706 (so->so_options & SO_NO_OFFLOAD) == 0 && 707 (error = tcp_offload_connect(so, nam)) == 0) 708 goto out; 709#endif 710 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 711 NET_EPOCH_ENTER(et); 712 error = tp->t_fb->tfb_tcp_output(tp); 713#ifdef INET 714out_in_epoch: 715#endif 716 NET_EPOCH_EXIT(et); 717out: 718 /* 719 * If the implicit bind in the connect call fails, restore 720 * the flags we modified. 721 */ 722 if (error != 0 && inp->inp_lport == 0) { 723 inp->inp_vflag = vflagsav; 724 inp->inp_inc.inc_flags = incflagsav; 725 } 726 727 TCPDEBUG2(PRU_CONNECT); 728 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 729 INP_WUNLOCK(inp); 730 return (error); 731} 732#endif /* INET6 */ 733 734/* 735 * Initiate disconnect from peer. 736 * If connection never passed embryonic stage, just drop; 737 * else if don't need to let data drain, then can just drop anyways, 738 * else have to begin TCP shutdown process: mark socket disconnecting, 739 * drain unread data, state switch to reflect user close, and 740 * send segment (e.g. FIN) to peer. Socket will be really disconnected 741 * when peer sends FIN and acks ours. 742 * 743 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 744 */ 745static int 746tcp_usr_disconnect(struct socket *so) 747{ 748 struct inpcb *inp; 749 struct tcpcb *tp = NULL; 750 struct epoch_tracker et; 751 int error = 0; 752 753 TCPDEBUG0; 754 NET_EPOCH_ENTER(et); 755 inp = sotoinpcb(so); 756 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 757 INP_WLOCK(inp); 758 if (inp->inp_flags & INP_TIMEWAIT) 759 goto out; 760 if (inp->inp_flags & INP_DROPPED) { 761 error = ECONNRESET; 762 goto out; 763 } 764 tp = intotcpcb(inp); 765 TCPDEBUG1(); 766 tcp_disconnect(tp); 767out: 768 TCPDEBUG2(PRU_DISCONNECT); 769 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 770 INP_WUNLOCK(inp); 771 NET_EPOCH_EXIT(et); 772 return (error); 773} 774 775#ifdef INET 776/* 777 * Accept a connection. Essentially all the work is done at higher levels; 778 * just return the address of the peer, storing through addr. 779 */ 780static int 781tcp_usr_accept(struct socket *so, struct sockaddr **nam) 782{ 783 int error = 0; 784 struct inpcb *inp = NULL; 785 struct tcpcb *tp = NULL; 786 struct in_addr addr; 787 in_port_t port = 0; 788 TCPDEBUG0; 789 790 if (so->so_state & SS_ISDISCONNECTED) 791 return (ECONNABORTED); 792 793 inp = sotoinpcb(so); 794 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 795 INP_WLOCK(inp); 796 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 797 error = ECONNABORTED; 798 goto out; 799 } 800 tp = intotcpcb(inp); 801 TCPDEBUG1(); 802 803 /* 804 * We inline in_getpeeraddr and COMMON_END here, so that we can 805 * copy the data of interest and defer the malloc until after we 806 * release the lock. 807 */ 808 port = inp->inp_fport; 809 addr = inp->inp_faddr; 810 811out: 812 TCPDEBUG2(PRU_ACCEPT); 813 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 814 INP_WUNLOCK(inp); 815 if (error == 0) 816 *nam = in_sockaddr(port, &addr); 817 return error; 818} 819#endif /* INET */ 820 821#ifdef INET6 822static int 823tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 824{ 825 struct inpcb *inp = NULL; 826 int error = 0; 827 struct tcpcb *tp = NULL; 828 struct in_addr addr; 829 struct in6_addr addr6; 830 struct epoch_tracker et; 831 in_port_t port = 0; 832 int v4 = 0; 833 TCPDEBUG0; 834 835 if (so->so_state & SS_ISDISCONNECTED) 836 return (ECONNABORTED); 837 838 inp = sotoinpcb(so); 839 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 840 NET_EPOCH_ENTER(et); 841 INP_WLOCK(inp); 842 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 843 error = ECONNABORTED; 844 goto out; 845 } 846 tp = intotcpcb(inp); 847 TCPDEBUG1(); 848 849 /* 850 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 851 * copy the data of interest and defer the malloc until after we 852 * release the lock. 853 */ 854 if (inp->inp_vflag & INP_IPV4) { 855 v4 = 1; 856 port = inp->inp_fport; 857 addr = inp->inp_faddr; 858 } else { 859 port = inp->inp_fport; 860 addr6 = inp->in6p_faddr; 861 } 862 863out: 864 TCPDEBUG2(PRU_ACCEPT); 865 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 866 INP_WUNLOCK(inp); 867 NET_EPOCH_EXIT(et); 868 if (error == 0) { 869 if (v4) 870 *nam = in6_v4mapsin6_sockaddr(port, &addr); 871 else 872 *nam = in6_sockaddr(port, &addr6); 873 } 874 return error; 875} 876#endif /* INET6 */ 877 878/* 879 * Mark the connection as being incapable of further output. 880 */ 881static int 882tcp_usr_shutdown(struct socket *so) 883{ 884 int error = 0; 885 struct inpcb *inp; 886 struct tcpcb *tp = NULL; 887 struct epoch_tracker et; 888 889 TCPDEBUG0; 890 NET_EPOCH_ENTER(et); 891 inp = sotoinpcb(so); 892 KASSERT(inp != NULL, ("inp == NULL")); 893 INP_WLOCK(inp); 894 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 895 error = ECONNRESET; 896 goto out; 897 } 898 tp = intotcpcb(inp); 899 TCPDEBUG1(); 900 socantsendmore(so); 901 tcp_usrclosed(tp); 902 if (!(inp->inp_flags & INP_DROPPED)) 903 error = tp->t_fb->tfb_tcp_output(tp); 904 905out: 906 TCPDEBUG2(PRU_SHUTDOWN); 907 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 908 INP_WUNLOCK(inp); 909 NET_EPOCH_EXIT(et); 910 911 return (error); 912} 913 914/* 915 * After a receive, possibly send window update to peer. 916 */ 917static int 918tcp_usr_rcvd(struct socket *so, int flags) 919{ 920 struct epoch_tracker et; 921 struct inpcb *inp; 922 struct tcpcb *tp = NULL; 923 int error = 0; 924 925 TCPDEBUG0; 926 inp = sotoinpcb(so); 927 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 928 INP_WLOCK(inp); 929 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 930 error = ECONNRESET; 931 goto out; 932 } 933 tp = intotcpcb(inp); 934 TCPDEBUG1(); 935 /* 936 * For passively-created TFO connections, don't attempt a window 937 * update while still in SYN_RECEIVED as this may trigger an early 938 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 939 * application response data, or failing that, when the DELACK timer 940 * expires. 941 */ 942 if (IS_FASTOPEN(tp->t_flags) && 943 (tp->t_state == TCPS_SYN_RECEIVED)) 944 goto out; 945 NET_EPOCH_ENTER(et); 946#ifdef TCP_OFFLOAD 947 if (tp->t_flags & TF_TOE) 948 tcp_offload_rcvd(tp); 949 else 950#endif 951 tp->t_fb->tfb_tcp_output(tp); 952 NET_EPOCH_EXIT(et); 953out: 954 TCPDEBUG2(PRU_RCVD); 955 TCP_PROBE2(debug__user, tp, PRU_RCVD); 956 INP_WUNLOCK(inp); 957 return (error); 958} 959 960/* 961 * Do a send by putting data in output queue and updating urgent 962 * marker if URG set. Possibly send more data. Unlike the other 963 * pru_*() routines, the mbuf chains are our responsibility. We 964 * must either enqueue them or free them. The other pru_* routines 965 * generally are caller-frees. 966 */ 967static int 968tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 969 struct sockaddr *nam, struct mbuf *control, struct thread *td) 970{ 971 struct epoch_tracker et; 972 int error = 0; 973 struct inpcb *inp; 974 struct tcpcb *tp = NULL; 975#ifdef INET 976#ifdef INET6 977 struct sockaddr_in sin; 978#endif 979 struct sockaddr_in *sinp; 980#endif 981#ifdef INET6 982 int isipv6; 983#endif 984 u_int8_t incflagsav; 985 u_char vflagsav; 986 bool restoreflags; 987 TCPDEBUG0; 988 989 /* 990 * We require the pcbinfo "read lock" if we will close the socket 991 * as part of this call. 992 */ 993 NET_EPOCH_ENTER(et); 994 inp = sotoinpcb(so); 995 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 996 INP_WLOCK(inp); 997 vflagsav = inp->inp_vflag; 998 incflagsav = inp->inp_inc.inc_flags; 999 restoreflags = false; 1000 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1001 if (control) 1002 m_freem(control); 1003 error = ECONNRESET; 1004 goto out; 1005 } 1006 if (control != NULL) { 1007 /* TCP doesn't do control messages (rights, creds, etc) */ 1008 if (control->m_len) { 1009 m_freem(control); 1010 error = EINVAL; 1011 goto out; 1012 } 1013 m_freem(control); /* empty control, just free it */ 1014 control = NULL; 1015 } 1016 tp = intotcpcb(inp); 1017 if ((flags & PRUS_OOB) != 0 && 1018 (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) 1019 goto out; 1020 1021 TCPDEBUG1(); 1022 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 1023 switch (nam->sa_family) { 1024#ifdef INET 1025 case AF_INET: 1026 sinp = (struct sockaddr_in *)nam; 1027 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 1028 error = EINVAL; 1029 goto out; 1030 } 1031 if ((inp->inp_vflag & INP_IPV6) != 0) { 1032 error = EAFNOSUPPORT; 1033 goto out; 1034 } 1035 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 1036 error = EAFNOSUPPORT; 1037 goto out; 1038 } 1039 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) { 1040 error = EACCES; 1041 goto out; 1042 } 1043 if ((error = prison_remote_ip4(td->td_ucred, 1044 &sinp->sin_addr))) 1045 goto out; 1046#ifdef INET6 1047 isipv6 = 0; 1048#endif 1049 break; 1050#endif /* INET */ 1051#ifdef INET6 1052 case AF_INET6: 1053 { 1054 struct sockaddr_in6 *sin6; 1055 1056 sin6 = (struct sockaddr_in6 *)nam; 1057 if (sin6->sin6_len != sizeof(*sin6)) { 1058 error = EINVAL; 1059 goto out; 1060 } 1061 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) { 1062 error = EAFNOSUPPORT; 1063 goto out; 1064 } 1065 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1066 error = EAFNOSUPPORT; 1067 goto out; 1068 } 1069 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1070#ifdef INET 1071 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1072 error = EINVAL; 1073 goto out; 1074 } 1075 if ((inp->inp_vflag & INP_IPV4) == 0) { 1076 error = EAFNOSUPPORT; 1077 goto out; 1078 } 1079 restoreflags = true; 1080 inp->inp_vflag &= ~INP_IPV6; 1081 sinp = &sin; 1082 in6_sin6_2_sin(sinp, sin6); 1083 if (IN_MULTICAST( 1084 ntohl(sinp->sin_addr.s_addr))) { 1085 error = EAFNOSUPPORT; 1086 goto out; 1087 } 1088 if ((error = prison_remote_ip4(td->td_ucred, 1089 &sinp->sin_addr))) 1090 goto out; 1091 isipv6 = 0; 1092#else /* !INET */ 1093 error = EAFNOSUPPORT; 1094 goto out; 1095#endif /* INET */ 1096 } else { 1097 if ((inp->inp_vflag & INP_IPV6) == 0) { 1098 error = EAFNOSUPPORT; 1099 goto out; 1100 } 1101 restoreflags = true; 1102 inp->inp_vflag &= ~INP_IPV4; 1103 inp->inp_inc.inc_flags |= INC_ISIPV6; 1104 if ((error = prison_remote_ip6(td->td_ucred, 1105 &sin6->sin6_addr))) 1106 goto out; 1107 isipv6 = 1; 1108 } 1109 break; 1110 } 1111#endif /* INET6 */ 1112 default: 1113 error = EAFNOSUPPORT; 1114 goto out; 1115 } 1116 } 1117 if (!(flags & PRUS_OOB)) { 1118 sbappendstream(&so->so_snd, m, flags); 1119 m = NULL; 1120 if (nam && tp->t_state < TCPS_SYN_SENT) { 1121 /* 1122 * Do implied connect if not yet connected, 1123 * initialize window to default value, and 1124 * initialize maxseg using peer's cached MSS. 1125 */ 1126#ifdef INET6 1127 if (isipv6) 1128 error = tcp6_connect(tp, nam, td); 1129#endif /* INET6 */ 1130#if defined(INET6) && defined(INET) 1131 else 1132#endif 1133#ifdef INET 1134 error = tcp_connect(tp, 1135 (struct sockaddr *)sinp, td); 1136#endif 1137 /* 1138 * The bind operation in tcp_connect succeeded. We 1139 * no longer want to restore the flags if later 1140 * operations fail. 1141 */ 1142 if (error == 0 || inp->inp_lport != 0) 1143 restoreflags = false; 1144 1145 if (error) { 1146 /* m is freed if PRUS_NOTREADY is unset. */ 1147 sbflush(&so->so_snd); 1148 goto out; 1149 } 1150 if (IS_FASTOPEN(tp->t_flags)) 1151 tcp_fastopen_connect(tp); 1152 else { 1153 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1154 tcp_mss(tp, -1); 1155 } 1156 } 1157 if (flags & PRUS_EOF) { 1158 /* 1159 * Close the send side of the connection after 1160 * the data is sent. 1161 */ 1162 socantsendmore(so); 1163 tcp_usrclosed(tp); 1164 } 1165 if (TCPS_HAVEESTABLISHED(tp->t_state) && 1166 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 1167 (tp->t_fbyte_out == 0) && 1168 (so->so_snd.sb_ccc > 0)) { 1169 tp->t_fbyte_out = ticks; 1170 if (tp->t_fbyte_out == 0) 1171 tp->t_fbyte_out = 1; 1172 if (tp->t_fbyte_out && tp->t_fbyte_in) 1173 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 1174 } 1175 if (!(inp->inp_flags & INP_DROPPED) && 1176 !(flags & PRUS_NOTREADY)) { 1177 if (flags & PRUS_MORETOCOME) 1178 tp->t_flags |= TF_MORETOCOME; 1179 error = tp->t_fb->tfb_tcp_output(tp); 1180 if (flags & PRUS_MORETOCOME) 1181 tp->t_flags &= ~TF_MORETOCOME; 1182 } 1183 } else { 1184 /* 1185 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1186 */ 1187 SOCKBUF_LOCK(&so->so_snd); 1188 if (sbspace(&so->so_snd) < -512) { 1189 SOCKBUF_UNLOCK(&so->so_snd); 1190 error = ENOBUFS; 1191 goto out; 1192 } 1193 /* 1194 * According to RFC961 (Assigned Protocols), 1195 * the urgent pointer points to the last octet 1196 * of urgent data. We continue, however, 1197 * to consider it to indicate the first octet 1198 * of data past the urgent section. 1199 * Otherwise, snd_up should be one lower. 1200 */ 1201 sbappendstream_locked(&so->so_snd, m, flags); 1202 SOCKBUF_UNLOCK(&so->so_snd); 1203 m = NULL; 1204 if (nam && tp->t_state < TCPS_SYN_SENT) { 1205 /* 1206 * Do implied connect if not yet connected, 1207 * initialize window to default value, and 1208 * initialize maxseg using peer's cached MSS. 1209 */ 1210 1211 /* 1212 * Not going to contemplate SYN|URG 1213 */ 1214 if (IS_FASTOPEN(tp->t_flags)) 1215 tp->t_flags &= ~TF_FASTOPEN; 1216#ifdef INET6 1217 if (isipv6) 1218 error = tcp6_connect(tp, nam, td); 1219#endif /* INET6 */ 1220#if defined(INET6) && defined(INET) 1221 else 1222#endif 1223#ifdef INET 1224 error = tcp_connect(tp, 1225 (struct sockaddr *)sinp, td); 1226#endif 1227 /* 1228 * The bind operation in tcp_connect succeeded. We 1229 * no longer want to restore the flags if later 1230 * operations fail. 1231 */ 1232 if (error == 0 || inp->inp_lport != 0) 1233 restoreflags = false; 1234 1235 if (error != 0) { 1236 /* m is freed if PRUS_NOTREADY is unset. */ 1237 sbflush(&so->so_snd); 1238 goto out; 1239 } 1240 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1241 tcp_mss(tp, -1); 1242 } 1243 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1244 if ((flags & PRUS_NOTREADY) == 0) { 1245 tp->t_flags |= TF_FORCEDATA; 1246 error = tp->t_fb->tfb_tcp_output(tp); 1247 tp->t_flags &= ~TF_FORCEDATA; 1248 } 1249 } 1250 TCP_LOG_EVENT(tp, NULL, 1251 &inp->inp_socket->so_rcv, 1252 &inp->inp_socket->so_snd, 1253 TCP_LOG_USERSEND, error, 1254 0, NULL, false); 1255 1256out: 1257 /* 1258 * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is 1259 * responsible for freeing memory. 1260 */ 1261 if (m != NULL && (flags & PRUS_NOTREADY) == 0) 1262 m_freem(m); 1263 1264 /* 1265 * If the request was unsuccessful and we changed flags, 1266 * restore the original flags. 1267 */ 1268 if (error != 0 && restoreflags) { 1269 inp->inp_vflag = vflagsav; 1270 inp->inp_inc.inc_flags = incflagsav; 1271 } 1272 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1273 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1274 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1275 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1276 INP_WUNLOCK(inp); 1277 NET_EPOCH_EXIT(et); 1278 return (error); 1279} 1280 1281static int 1282tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1283{ 1284 struct epoch_tracker et; 1285 struct inpcb *inp; 1286 struct tcpcb *tp; 1287 int error; 1288 1289 inp = sotoinpcb(so); 1290 INP_WLOCK(inp); 1291 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1292 INP_WUNLOCK(inp); 1293 mb_free_notready(m, count); 1294 return (ECONNRESET); 1295 } 1296 tp = intotcpcb(inp); 1297 1298 SOCKBUF_LOCK(&so->so_snd); 1299 error = sbready(&so->so_snd, m, count); 1300 SOCKBUF_UNLOCK(&so->so_snd); 1301 if (error == 0) { 1302 NET_EPOCH_ENTER(et); 1303 error = tp->t_fb->tfb_tcp_output(tp); 1304 NET_EPOCH_EXIT(et); 1305 } 1306 INP_WUNLOCK(inp); 1307 1308 return (error); 1309} 1310 1311/* 1312 * Abort the TCP. Drop the connection abruptly. 1313 */ 1314static void 1315tcp_usr_abort(struct socket *so) 1316{ 1317 struct inpcb *inp; 1318 struct tcpcb *tp = NULL; 1319 struct epoch_tracker et; 1320 TCPDEBUG0; 1321 1322 inp = sotoinpcb(so); 1323 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1324 1325 NET_EPOCH_ENTER(et); 1326 INP_WLOCK(inp); 1327 KASSERT(inp->inp_socket != NULL, 1328 ("tcp_usr_abort: inp_socket == NULL")); 1329 1330 /* 1331 * If we still have full TCP state, and we're not dropped, drop. 1332 */ 1333 if (!(inp->inp_flags & INP_TIMEWAIT) && 1334 !(inp->inp_flags & INP_DROPPED)) { 1335 tp = intotcpcb(inp); 1336 TCPDEBUG1(); 1337 tp = tcp_drop(tp, ECONNABORTED); 1338 if (tp == NULL) 1339 goto dropped; 1340 TCPDEBUG2(PRU_ABORT); 1341 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1342 } 1343 if (!(inp->inp_flags & INP_DROPPED)) { 1344 SOCK_LOCK(so); 1345 so->so_state |= SS_PROTOREF; 1346 SOCK_UNLOCK(so); 1347 inp->inp_flags |= INP_SOCKREF; 1348 } 1349 INP_WUNLOCK(inp); 1350dropped: 1351 NET_EPOCH_EXIT(et); 1352} 1353 1354/* 1355 * TCP socket is closed. Start friendly disconnect. 1356 */ 1357static void 1358tcp_usr_close(struct socket *so) 1359{ 1360 struct inpcb *inp; 1361 struct tcpcb *tp = NULL; 1362 struct epoch_tracker et; 1363 TCPDEBUG0; 1364 1365 inp = sotoinpcb(so); 1366 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1367 1368 NET_EPOCH_ENTER(et); 1369 INP_WLOCK(inp); 1370 KASSERT(inp->inp_socket != NULL, 1371 ("tcp_usr_close: inp_socket == NULL")); 1372 1373 /* 1374 * If we still have full TCP state, and we're not dropped, initiate 1375 * a disconnect. 1376 */ 1377 if (!(inp->inp_flags & INP_TIMEWAIT) && 1378 !(inp->inp_flags & INP_DROPPED)) { 1379 tp = intotcpcb(inp); 1380 TCPDEBUG1(); 1381 tcp_disconnect(tp); 1382 TCPDEBUG2(PRU_CLOSE); 1383 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1384 } 1385 if (!(inp->inp_flags & INP_DROPPED)) { 1386 SOCK_LOCK(so); 1387 so->so_state |= SS_PROTOREF; 1388 SOCK_UNLOCK(so); 1389 inp->inp_flags |= INP_SOCKREF; 1390 } 1391 INP_WUNLOCK(inp); 1392 NET_EPOCH_EXIT(et); 1393} 1394 1395static int 1396tcp_pru_options_support(struct tcpcb *tp, int flags) 1397{ 1398 /* 1399 * If the specific TCP stack has a pru_options 1400 * specified then it does not always support 1401 * all the PRU_XX options and we must ask it. 1402 * If the function is not specified then all 1403 * of the PRU_XX options are supported. 1404 */ 1405 int ret = 0; 1406 1407 if (tp->t_fb->tfb_pru_options) { 1408 ret = (*tp->t_fb->tfb_pru_options)(tp, flags); 1409 } 1410 return (ret); 1411} 1412 1413/* 1414 * Receive out-of-band data. 1415 */ 1416static int 1417tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1418{ 1419 int error = 0; 1420 struct inpcb *inp; 1421 struct tcpcb *tp = NULL; 1422 1423 TCPDEBUG0; 1424 inp = sotoinpcb(so); 1425 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1426 INP_WLOCK(inp); 1427 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1428 error = ECONNRESET; 1429 goto out; 1430 } 1431 tp = intotcpcb(inp); 1432 error = tcp_pru_options_support(tp, PRUS_OOB); 1433 if (error) { 1434 goto out; 1435 } 1436 TCPDEBUG1(); 1437 if ((so->so_oobmark == 0 && 1438 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1439 so->so_options & SO_OOBINLINE || 1440 tp->t_oobflags & TCPOOB_HADDATA) { 1441 error = EINVAL; 1442 goto out; 1443 } 1444 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1445 error = EWOULDBLOCK; 1446 goto out; 1447 } 1448 m->m_len = 1; 1449 *mtod(m, caddr_t) = tp->t_iobc; 1450 if ((flags & MSG_PEEK) == 0) 1451 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1452 1453out: 1454 TCPDEBUG2(PRU_RCVOOB); 1455 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1456 INP_WUNLOCK(inp); 1457 return (error); 1458} 1459 1460#ifdef INET 1461struct pr_usrreqs tcp_usrreqs = { 1462 .pru_abort = tcp_usr_abort, 1463 .pru_accept = tcp_usr_accept, 1464 .pru_attach = tcp_usr_attach, 1465 .pru_bind = tcp_usr_bind, 1466 .pru_connect = tcp_usr_connect, 1467 .pru_control = in_control, 1468 .pru_detach = tcp_usr_detach, 1469 .pru_disconnect = tcp_usr_disconnect, 1470 .pru_listen = tcp_usr_listen, 1471 .pru_peeraddr = in_getpeeraddr, 1472 .pru_rcvd = tcp_usr_rcvd, 1473 .pru_rcvoob = tcp_usr_rcvoob, 1474 .pru_send = tcp_usr_send, 1475 .pru_ready = tcp_usr_ready, 1476 .pru_shutdown = tcp_usr_shutdown, 1477 .pru_sockaddr = in_getsockaddr, 1478 .pru_sosetlabel = in_pcbsosetlabel, 1479 .pru_close = tcp_usr_close, 1480}; 1481#endif /* INET */ 1482 1483#ifdef INET6 1484struct pr_usrreqs tcp6_usrreqs = { 1485 .pru_abort = tcp_usr_abort, 1486 .pru_accept = tcp6_usr_accept, 1487 .pru_attach = tcp_usr_attach, 1488 .pru_bind = tcp6_usr_bind, 1489 .pru_connect = tcp6_usr_connect, 1490 .pru_control = in6_control, 1491 .pru_detach = tcp_usr_detach, 1492 .pru_disconnect = tcp_usr_disconnect, 1493 .pru_listen = tcp6_usr_listen, 1494 .pru_peeraddr = in6_mapped_peeraddr, 1495 .pru_rcvd = tcp_usr_rcvd, 1496 .pru_rcvoob = tcp_usr_rcvoob, 1497 .pru_send = tcp_usr_send, 1498 .pru_ready = tcp_usr_ready, 1499 .pru_shutdown = tcp_usr_shutdown, 1500 .pru_sockaddr = in6_mapped_sockaddr, 1501 .pru_sosetlabel = in_pcbsosetlabel, 1502 .pru_close = tcp_usr_close, 1503}; 1504#endif /* INET6 */ 1505 1506#ifdef INET 1507/* 1508 * Common subroutine to open a TCP connection to remote host specified 1509 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1510 * port number if needed. Call in_pcbconnect_setup to do the routing and 1511 * to choose a local host address (interface). If there is an existing 1512 * incarnation of the same connection in TIME-WAIT state and if the remote 1513 * host was sending CC options and if the connection duration was < MSL, then 1514 * truncate the previous TIME-WAIT state and proceed. 1515 * Initialize connection parameters and enter SYN-SENT state. 1516 */ 1517static int 1518tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1519{ 1520 struct inpcb *inp = tp->t_inpcb, *oinp; 1521 struct socket *so = inp->inp_socket; 1522 struct in_addr laddr; 1523 u_short lport; 1524 int error; 1525 1526 NET_EPOCH_ASSERT(); 1527 INP_WLOCK_ASSERT(inp); 1528 INP_HASH_WLOCK(&V_tcbinfo); 1529 1530 if (V_tcp_require_unique_port && inp->inp_lport == 0) { 1531 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1532 if (error) 1533 goto out; 1534 } 1535 1536 /* 1537 * Cannot simply call in_pcbconnect, because there might be an 1538 * earlier incarnation of this same connection still in 1539 * TIME_WAIT state, creating an ADDRINUSE error. 1540 */ 1541 laddr = inp->inp_laddr; 1542 lport = inp->inp_lport; 1543 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1544 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1545 if (error && oinp == NULL) 1546 goto out; 1547 if (oinp) { 1548 error = EADDRINUSE; 1549 goto out; 1550 } 1551 /* Handle initial bind if it hadn't been done in advance. */ 1552 if (inp->inp_lport == 0) { 1553 inp->inp_lport = lport; 1554 if (in_pcbinshash(inp) != 0) { 1555 inp->inp_lport = 0; 1556 error = EAGAIN; 1557 goto out; 1558 } 1559 } 1560 inp->inp_laddr = laddr; 1561 in_pcbrehash(inp); 1562 INP_HASH_WUNLOCK(&V_tcbinfo); 1563 1564 /* 1565 * Compute window scaling to request: 1566 * Scale to fit into sweet spot. See tcp_syncache.c. 1567 * XXX: This should move to tcp_output(). 1568 */ 1569 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1570 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1571 tp->request_r_scale++; 1572 1573 soisconnecting(so); 1574 TCPSTAT_INC(tcps_connattempt); 1575 tcp_state_change(tp, TCPS_SYN_SENT); 1576 tp->iss = tcp_new_isn(&inp->inp_inc); 1577 if (tp->t_flags & TF_REQ_TSTMP) 1578 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1579 tcp_sendseqinit(tp); 1580 1581 return 0; 1582 1583out: 1584 INP_HASH_WUNLOCK(&V_tcbinfo); 1585 return (error); 1586} 1587#endif /* INET */ 1588 1589#ifdef INET6 1590static int 1591tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1592{ 1593 struct inpcb *inp = tp->t_inpcb; 1594 int error; 1595 1596 INP_WLOCK_ASSERT(inp); 1597 INP_HASH_WLOCK(&V_tcbinfo); 1598 1599 if (V_tcp_require_unique_port && inp->inp_lport == 0) { 1600 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1601 if (error) 1602 goto out; 1603 } 1604 error = in6_pcbconnect(inp, nam, td->td_ucred); 1605 if (error != 0) 1606 goto out; 1607 INP_HASH_WUNLOCK(&V_tcbinfo); 1608 1609 /* Compute window scaling to request. */ 1610 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1611 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1612 tp->request_r_scale++; 1613 1614 soisconnecting(inp->inp_socket); 1615 TCPSTAT_INC(tcps_connattempt); 1616 tcp_state_change(tp, TCPS_SYN_SENT); 1617 tp->iss = tcp_new_isn(&inp->inp_inc); 1618 if (tp->t_flags & TF_REQ_TSTMP) 1619 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1620 tcp_sendseqinit(tp); 1621 1622 return 0; 1623 1624out: 1625 INP_HASH_WUNLOCK(&V_tcbinfo); 1626 return error; 1627} 1628#endif /* INET6 */ 1629 1630/* 1631 * Export TCP internal state information via a struct tcp_info, based on the 1632 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1633 * (TCP state machine, etc). We export all information using FreeBSD-native 1634 * constants -- for example, the numeric values for tcpi_state will differ 1635 * from Linux. 1636 */ 1637static void 1638tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1639{ 1640 1641 INP_WLOCK_ASSERT(tp->t_inpcb); 1642 bzero(ti, sizeof(*ti)); 1643 1644 ti->tcpi_state = tp->t_state; 1645 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1646 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1647 if (tp->t_flags & TF_SACK_PERMIT) 1648 ti->tcpi_options |= TCPI_OPT_SACK; 1649 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1650 ti->tcpi_options |= TCPI_OPT_WSCALE; 1651 ti->tcpi_snd_wscale = tp->snd_scale; 1652 ti->tcpi_rcv_wscale = tp->rcv_scale; 1653 } 1654 if (tp->t_flags2 & TF2_ECN_PERMIT) 1655 ti->tcpi_options |= TCPI_OPT_ECN; 1656 1657 ti->tcpi_rto = tp->t_rxtcur * tick; 1658 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1659 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1660 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1661 1662 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1663 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1664 1665 /* 1666 * FreeBSD-specific extension fields for tcp_info. 1667 */ 1668 ti->tcpi_rcv_space = tp->rcv_wnd; 1669 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1670 ti->tcpi_snd_wnd = tp->snd_wnd; 1671 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1672 ti->tcpi_snd_nxt = tp->snd_nxt; 1673 ti->tcpi_snd_mss = tp->t_maxseg; 1674 ti->tcpi_rcv_mss = tp->t_maxseg; 1675 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1676 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1677 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1678#ifdef TCP_OFFLOAD 1679 if (tp->t_flags & TF_TOE) { 1680 ti->tcpi_options |= TCPI_OPT_TOE; 1681 tcp_offload_tcp_info(tp, ti); 1682 } 1683#endif 1684} 1685 1686/* 1687 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1688 * socket option arguments. When it re-acquires the lock after the copy, it 1689 * has to revalidate that the connection is still valid for the socket 1690 * option. 1691 */ 1692#define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1693 INP_WLOCK(inp); \ 1694 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1695 INP_WUNLOCK(inp); \ 1696 cleanup; \ 1697 return (ECONNRESET); \ 1698 } \ 1699 tp = intotcpcb(inp); \ 1700} while(0) 1701#define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1702 1703int 1704tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1705{ 1706 int error; 1707 struct inpcb *inp; 1708 struct tcpcb *tp; 1709 struct tcp_function_block *blk; 1710 struct tcp_function_set fsn; 1711 1712 error = 0; 1713 inp = sotoinpcb(so); 1714 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1715 if (sopt->sopt_level != IPPROTO_TCP) { 1716#ifdef INET6 1717 if (inp->inp_vflag & INP_IPV6PROTO) { 1718 error = ip6_ctloutput(so, sopt); 1719 /* 1720 * In case of the IPV6_USE_MIN_MTU socket option, 1721 * the INC_IPV6MINMTU flag to announce a corresponding 1722 * MSS during the initial handshake. 1723 * If the TCP connection is not in the front states, 1724 * just reduce the MSS being used. 1725 * This avoids the sending of TCP segments which will 1726 * be fragmented at the IPv6 layer. 1727 */ 1728 if ((error == 0) && 1729 (sopt->sopt_dir == SOPT_SET) && 1730 (sopt->sopt_level == IPPROTO_IPV6) && 1731 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1732 INP_WLOCK(inp); 1733 if ((inp->inp_flags & 1734 (INP_TIMEWAIT | INP_DROPPED))) { 1735 INP_WUNLOCK(inp); 1736 return (ECONNRESET); 1737 } 1738 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1739 tp = intotcpcb(inp); 1740 if ((tp->t_state >= TCPS_SYN_SENT) && 1741 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1742 struct ip6_pktopts *opt; 1743 1744 opt = inp->in6p_outputopts; 1745 if ((opt != NULL) && 1746 (opt->ip6po_minmtu == 1747 IP6PO_MINMTU_ALL)) { 1748 if (tp->t_maxseg > TCP6_MSS) { 1749 tp->t_maxseg = TCP6_MSS; 1750 } 1751 } 1752 } 1753 INP_WUNLOCK(inp); 1754 } 1755 } 1756#endif /* INET6 */ 1757#if defined(INET6) && defined(INET) 1758 else 1759#endif 1760#ifdef INET 1761 { 1762 error = ip_ctloutput(so, sopt); 1763 } 1764#endif 1765 return (error); 1766 } 1767 INP_WLOCK(inp); 1768 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1769 INP_WUNLOCK(inp); 1770 return (ECONNRESET); 1771 } 1772 tp = intotcpcb(inp); 1773 /* 1774 * Protect the TCP option TCP_FUNCTION_BLK so 1775 * that a sub-function can *never* overwrite this. 1776 */ 1777 if ((sopt->sopt_dir == SOPT_SET) && 1778 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1779 INP_WUNLOCK(inp); 1780 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1781 sizeof fsn); 1782 if (error) 1783 return (error); 1784 INP_WLOCK_RECHECK(inp); 1785 blk = find_and_ref_tcp_functions(&fsn); 1786 if (blk == NULL) { 1787 INP_WUNLOCK(inp); 1788 return (ENOENT); 1789 } 1790 if (tp->t_fb == blk) { 1791 /* You already have this */ 1792 refcount_release(&blk->tfb_refcnt); 1793 INP_WUNLOCK(inp); 1794 return (0); 1795 } 1796 if (tp->t_state != TCPS_CLOSED) { 1797 /* 1798 * The user has advanced the state 1799 * past the initial point, we may not 1800 * be able to switch. 1801 */ 1802 if (blk->tfb_tcp_handoff_ok != NULL) { 1803 /* 1804 * Does the stack provide a 1805 * query mechanism, if so it may 1806 * still be possible? 1807 */ 1808 error = (*blk->tfb_tcp_handoff_ok)(tp); 1809 } else 1810 error = EINVAL; 1811 if (error) { 1812 refcount_release(&blk->tfb_refcnt); 1813 INP_WUNLOCK(inp); 1814 return(error); 1815 } 1816 } 1817 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1818 refcount_release(&blk->tfb_refcnt); 1819 INP_WUNLOCK(inp); 1820 return (ENOENT); 1821 } 1822 /* 1823 * Release the old refcnt, the 1824 * lookup acquired a ref on the 1825 * new one already. 1826 */ 1827 if (tp->t_fb->tfb_tcp_fb_fini) { 1828 /* 1829 * Tell the stack to cleanup with 0 i.e. 1830 * the tcb is not going away. 1831 */ 1832 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1833 } 1834#ifdef TCPHPTS 1835 /* Assure that we are not on any hpts */ 1836 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1837#endif 1838 if (blk->tfb_tcp_fb_init) { 1839 error = (*blk->tfb_tcp_fb_init)(tp); 1840 if (error) { 1841 refcount_release(&blk->tfb_refcnt); 1842 if (tp->t_fb->tfb_tcp_fb_init) { 1843 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1844 /* Fall back failed, drop the connection */ 1845 INP_WUNLOCK(inp); 1846 soabort(so); 1847 return(error); 1848 } 1849 } 1850 goto err_out; 1851 } 1852 } 1853 refcount_release(&tp->t_fb->tfb_refcnt); 1854 tp->t_fb = blk; 1855#ifdef TCP_OFFLOAD 1856 if (tp->t_flags & TF_TOE) { 1857 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1858 sopt->sopt_name); 1859 } 1860#endif 1861err_out: 1862 INP_WUNLOCK(inp); 1863 return (error); 1864 } else if ((sopt->sopt_dir == SOPT_GET) && 1865 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1866 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1867 TCP_FUNCTION_NAME_LEN_MAX); 1868 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1869 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1870 INP_WUNLOCK(inp); 1871 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1872 return (error); 1873 } 1874 /* Pass in the INP locked, called must unlock it */ 1875 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1876} 1877 1878/* 1879 * If this assert becomes untrue, we need to change the size of the buf 1880 * variable in tcp_default_ctloutput(). 1881 */ 1882#ifdef CTASSERT 1883CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1884CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1885#endif 1886 1887#ifdef KERN_TLS 1888static int 1889copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls) 1890{ 1891 struct tls_enable_v0 tls_v0; 1892 int error; 1893 1894 if (sopt->sopt_valsize == sizeof(tls_v0)) { 1895 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0), 1896 sizeof(tls_v0)); 1897 if (error) 1898 return (error); 1899 memset(tls, 0, sizeof(*tls)); 1900 tls->cipher_key = tls_v0.cipher_key; 1901 tls->iv = tls_v0.iv; 1902 tls->auth_key = tls_v0.auth_key; 1903 tls->cipher_algorithm = tls_v0.cipher_algorithm; 1904 tls->cipher_key_len = tls_v0.cipher_key_len; 1905 tls->iv_len = tls_v0.iv_len; 1906 tls->auth_algorithm = tls_v0.auth_algorithm; 1907 tls->auth_key_len = tls_v0.auth_key_len; 1908 tls->flags = tls_v0.flags; 1909 tls->tls_vmajor = tls_v0.tls_vmajor; 1910 tls->tls_vminor = tls_v0.tls_vminor; 1911 return (0); 1912 } 1913 1914 return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls))); 1915} 1916#endif 1917 1918int 1919tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1920{ 1921 int error, opt, optval; 1922 u_int ui; 1923 struct tcp_info ti; 1924#ifdef KERN_TLS 1925 struct tls_enable tls; 1926#endif 1927 struct cc_algo *algo; 1928 char *pbuf, buf[TCP_LOG_ID_LEN]; 1929#ifdef STATS 1930 struct statsblob *sbp; 1931#endif 1932 size_t len; 1933 1934 /* 1935 * For TCP_CCALGOOPT forward the control to CC module, for both 1936 * SOPT_SET and SOPT_GET. 1937 */ 1938 switch (sopt->sopt_name) { 1939 case TCP_CCALGOOPT: 1940 INP_WUNLOCK(inp); 1941 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 1942 return (EINVAL); 1943 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1944 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1945 sopt->sopt_valsize); 1946 if (error) { 1947 free(pbuf, M_TEMP); 1948 return (error); 1949 } 1950 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1951 if (CC_ALGO(tp)->ctl_output != NULL) 1952 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1953 else 1954 error = ENOENT; 1955 INP_WUNLOCK(inp); 1956 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1957 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1958 free(pbuf, M_TEMP); 1959 return (error); 1960 } 1961 1962 switch (sopt->sopt_dir) { 1963 case SOPT_SET: 1964 switch (sopt->sopt_name) { 1965#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1966 case TCP_MD5SIG: 1967 if (!TCPMD5_ENABLED()) { 1968 INP_WUNLOCK(inp); 1969 return (ENOPROTOOPT); 1970 } 1971 error = TCPMD5_PCBCTL(inp, sopt); 1972 if (error) 1973 return (error); 1974 goto unlock_and_done; 1975#endif /* IPSEC */ 1976 1977 case TCP_NODELAY: 1978 case TCP_NOOPT: 1979 INP_WUNLOCK(inp); 1980 error = sooptcopyin(sopt, &optval, sizeof optval, 1981 sizeof optval); 1982 if (error) 1983 return (error); 1984 1985 INP_WLOCK_RECHECK(inp); 1986 switch (sopt->sopt_name) { 1987 case TCP_NODELAY: 1988 opt = TF_NODELAY; 1989 break; 1990 case TCP_NOOPT: 1991 opt = TF_NOOPT; 1992 break; 1993 default: 1994 opt = 0; /* dead code to fool gcc */ 1995 break; 1996 } 1997 1998 if (optval) 1999 tp->t_flags |= opt; 2000 else 2001 tp->t_flags &= ~opt; 2002unlock_and_done: 2003#ifdef TCP_OFFLOAD 2004 if (tp->t_flags & TF_TOE) { 2005 tcp_offload_ctloutput(tp, sopt->sopt_dir, 2006 sopt->sopt_name); 2007 } 2008#endif 2009 INP_WUNLOCK(inp); 2010 break; 2011 2012 case TCP_NOPUSH: 2013 INP_WUNLOCK(inp); 2014 error = sooptcopyin(sopt, &optval, sizeof optval, 2015 sizeof optval); 2016 if (error) 2017 return (error); 2018 2019 INP_WLOCK_RECHECK(inp); 2020 if (optval) 2021 tp->t_flags |= TF_NOPUSH; 2022 else if (tp->t_flags & TF_NOPUSH) { 2023 tp->t_flags &= ~TF_NOPUSH; 2024 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 2025 struct epoch_tracker et; 2026 2027 NET_EPOCH_ENTER(et); 2028 error = tp->t_fb->tfb_tcp_output(tp); 2029 NET_EPOCH_EXIT(et); 2030 } 2031 } 2032 goto unlock_and_done; 2033 2034 case TCP_REMOTE_UDP_ENCAPS_PORT: 2035 INP_WUNLOCK(inp); 2036 error = sooptcopyin(sopt, &optval, sizeof optval, 2037 sizeof optval); 2038 if (error) 2039 return (error); 2040 if ((optval < TCP_TUNNELING_PORT_MIN) || 2041 (optval > TCP_TUNNELING_PORT_MAX)) { 2042 /* Its got to be in range */ 2043 return (EINVAL); 2044 } 2045 if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) { 2046 /* You have to have enabled a UDP tunneling port first */ 2047 return (EINVAL); 2048 } 2049 INP_WLOCK_RECHECK(inp); 2050 if (tp->t_state != TCPS_CLOSED) { 2051 /* You can't change after you are connected */ 2052 error = EINVAL; 2053 } else { 2054 /* Ok we are all good set the port */ 2055 tp->t_port = htons(optval); 2056 } 2057 goto unlock_and_done; 2058 2059 case TCP_MAXSEG: 2060 INP_WUNLOCK(inp); 2061 error = sooptcopyin(sopt, &optval, sizeof optval, 2062 sizeof optval); 2063 if (error) 2064 return (error); 2065 2066 INP_WLOCK_RECHECK(inp); 2067 if (optval > 0 && optval <= tp->t_maxseg && 2068 optval + 40 >= V_tcp_minmss) 2069 tp->t_maxseg = optval; 2070 else 2071 error = EINVAL; 2072 goto unlock_and_done; 2073 2074 case TCP_INFO: 2075 INP_WUNLOCK(inp); 2076 error = EINVAL; 2077 break; 2078 2079 case TCP_STATS: 2080 INP_WUNLOCK(inp); 2081#ifdef STATS 2082 error = sooptcopyin(sopt, &optval, sizeof optval, 2083 sizeof optval); 2084 if (error) 2085 return (error); 2086 2087 if (optval > 0) 2088 sbp = stats_blob_alloc( 2089 V_tcp_perconn_stats_dflt_tpl, 0); 2090 else 2091 sbp = NULL; 2092 2093 INP_WLOCK_RECHECK(inp); 2094 if ((tp->t_stats != NULL && sbp == NULL) || 2095 (tp->t_stats == NULL && sbp != NULL)) { 2096 struct statsblob *t = tp->t_stats; 2097 tp->t_stats = sbp; 2098 sbp = t; 2099 } 2100 INP_WUNLOCK(inp); 2101 2102 stats_blob_destroy(sbp); 2103#else 2104 return (EOPNOTSUPP); 2105#endif /* !STATS */ 2106 break; 2107 2108 case TCP_CONGESTION: 2109 INP_WUNLOCK(inp); 2110 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 2111 if (error) 2112 break; 2113 buf[sopt->sopt_valsize] = '\0'; 2114 INP_WLOCK_RECHECK(inp); 2115 CC_LIST_RLOCK(); 2116 STAILQ_FOREACH(algo, &cc_list, entries) 2117 if (strncmp(buf, algo->name, 2118 TCP_CA_NAME_MAX) == 0) 2119 break; 2120 CC_LIST_RUNLOCK(); 2121 if (algo == NULL) { 2122 INP_WUNLOCK(inp); 2123 error = EINVAL; 2124 break; 2125 } 2126 /* 2127 * We hold a write lock over the tcb so it's safe to 2128 * do these things without ordering concerns. 2129 */ 2130 if (CC_ALGO(tp)->cb_destroy != NULL) 2131 CC_ALGO(tp)->cb_destroy(tp->ccv); 2132 CC_DATA(tp) = NULL; 2133 CC_ALGO(tp) = algo; 2134 /* 2135 * If something goes pear shaped initialising the new 2136 * algo, fall back to newreno (which does not 2137 * require initialisation). 2138 */ 2139 if (algo->cb_init != NULL && 2140 algo->cb_init(tp->ccv) != 0) { 2141 CC_ALGO(tp) = &newreno_cc_algo; 2142 /* 2143 * The only reason init should fail is 2144 * because of malloc. 2145 */ 2146 error = ENOMEM; 2147 } 2148 INP_WUNLOCK(inp); 2149 break; 2150 2151 case TCP_REUSPORT_LB_NUMA: 2152 INP_WUNLOCK(inp); 2153 error = sooptcopyin(sopt, &optval, sizeof(optval), 2154 sizeof(optval)); 2155 INP_WLOCK_RECHECK(inp); 2156 if (!error) 2157 error = in_pcblbgroup_numa(inp, optval); 2158 INP_WUNLOCK(inp); 2159 break; 2160 2161#ifdef KERN_TLS 2162 case TCP_TXTLS_ENABLE: 2163 INP_WUNLOCK(inp); 2164 error = copyin_tls_enable(sopt, &tls); 2165 if (error) 2166 break; 2167 error = ktls_enable_tx(so, &tls); 2168 break; 2169 case TCP_TXTLS_MODE: 2170 INP_WUNLOCK(inp); 2171 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2172 if (error) 2173 return (error); 2174 2175 INP_WLOCK_RECHECK(inp); 2176 error = ktls_set_tx_mode(so, ui); 2177 INP_WUNLOCK(inp); 2178 break; 2179 case TCP_RXTLS_ENABLE: 2180 INP_WUNLOCK(inp); 2181 error = sooptcopyin(sopt, &tls, sizeof(tls), 2182 sizeof(tls)); 2183 if (error) 2184 break; 2185 error = ktls_enable_rx(so, &tls); 2186 break; 2187#endif 2188 2189 case TCP_KEEPIDLE: 2190 case TCP_KEEPINTVL: 2191 case TCP_KEEPINIT: 2192 INP_WUNLOCK(inp); 2193 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2194 if (error) 2195 return (error); 2196 2197 if (ui > (UINT_MAX / hz)) { 2198 error = EINVAL; 2199 break; 2200 } 2201 ui *= hz; 2202 2203 INP_WLOCK_RECHECK(inp); 2204 switch (sopt->sopt_name) { 2205 case TCP_KEEPIDLE: 2206 tp->t_keepidle = ui; 2207 /* 2208 * XXX: better check current remaining 2209 * timeout and "merge" it with new value. 2210 */ 2211 if ((tp->t_state > TCPS_LISTEN) && 2212 (tp->t_state <= TCPS_CLOSING)) 2213 tcp_timer_activate(tp, TT_KEEP, 2214 TP_KEEPIDLE(tp)); 2215 break; 2216 case TCP_KEEPINTVL: 2217 tp->t_keepintvl = ui; 2218 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2219 (TP_MAXIDLE(tp) > 0)) 2220 tcp_timer_activate(tp, TT_2MSL, 2221 TP_MAXIDLE(tp)); 2222 break; 2223 case TCP_KEEPINIT: 2224 tp->t_keepinit = ui; 2225 if (tp->t_state == TCPS_SYN_RECEIVED || 2226 tp->t_state == TCPS_SYN_SENT) 2227 tcp_timer_activate(tp, TT_KEEP, 2228 TP_KEEPINIT(tp)); 2229 break; 2230 } 2231 goto unlock_and_done; 2232 2233 case TCP_KEEPCNT: 2234 INP_WUNLOCK(inp); 2235 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2236 if (error) 2237 return (error); 2238 2239 INP_WLOCK_RECHECK(inp); 2240 tp->t_keepcnt = ui; 2241 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2242 (TP_MAXIDLE(tp) > 0)) 2243 tcp_timer_activate(tp, TT_2MSL, 2244 TP_MAXIDLE(tp)); 2245 goto unlock_and_done; 2246 2247#ifdef TCPPCAP 2248 case TCP_PCAP_OUT: 2249 case TCP_PCAP_IN: 2250 INP_WUNLOCK(inp); 2251 error = sooptcopyin(sopt, &optval, sizeof optval, 2252 sizeof optval); 2253 if (error) 2254 return (error); 2255 2256 INP_WLOCK_RECHECK(inp); 2257 if (optval >= 0) 2258 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 2259 &(tp->t_outpkts) : &(tp->t_inpkts), 2260 optval); 2261 else 2262 error = EINVAL; 2263 goto unlock_and_done; 2264#endif 2265 2266 case TCP_FASTOPEN: { 2267 struct tcp_fastopen tfo_optval; 2268 2269 INP_WUNLOCK(inp); 2270 if (!V_tcp_fastopen_client_enable && 2271 !V_tcp_fastopen_server_enable) 2272 return (EPERM); 2273 2274 error = sooptcopyin(sopt, &tfo_optval, 2275 sizeof(tfo_optval), sizeof(int)); 2276 if (error) 2277 return (error); 2278 2279 INP_WLOCK_RECHECK(inp); 2280 if ((tp->t_state != TCPS_CLOSED) && 2281 (tp->t_state != TCPS_LISTEN)) { 2282 error = EINVAL; 2283 goto unlock_and_done; 2284 } 2285 if (tfo_optval.enable) { 2286 if (tp->t_state == TCPS_LISTEN) { 2287 if (!V_tcp_fastopen_server_enable) { 2288 error = EPERM; 2289 goto unlock_and_done; 2290 } 2291 2292 if (tp->t_tfo_pending == NULL) 2293 tp->t_tfo_pending = 2294 tcp_fastopen_alloc_counter(); 2295 } else { 2296 /* 2297 * If a pre-shared key was provided, 2298 * stash it in the client cookie 2299 * field of the tcpcb for use during 2300 * connect. 2301 */ 2302 if (sopt->sopt_valsize == 2303 sizeof(tfo_optval)) { 2304 memcpy(tp->t_tfo_cookie.client, 2305 tfo_optval.psk, 2306 TCP_FASTOPEN_PSK_LEN); 2307 tp->t_tfo_client_cookie_len = 2308 TCP_FASTOPEN_PSK_LEN; 2309 } 2310 } 2311 tp->t_flags |= TF_FASTOPEN; 2312 } else 2313 tp->t_flags &= ~TF_FASTOPEN; 2314 goto unlock_and_done; 2315 } 2316 2317#ifdef TCP_BLACKBOX 2318 case TCP_LOG: 2319 INP_WUNLOCK(inp); 2320 error = sooptcopyin(sopt, &optval, sizeof optval, 2321 sizeof optval); 2322 if (error) 2323 return (error); 2324 2325 INP_WLOCK_RECHECK(inp); 2326 error = tcp_log_state_change(tp, optval); 2327 goto unlock_and_done; 2328 2329 case TCP_LOGBUF: 2330 INP_WUNLOCK(inp); 2331 error = EINVAL; 2332 break; 2333 2334 case TCP_LOGID: 2335 INP_WUNLOCK(inp); 2336 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2337 if (error) 2338 break; 2339 buf[sopt->sopt_valsize] = '\0'; 2340 INP_WLOCK_RECHECK(inp); 2341 error = tcp_log_set_id(tp, buf); 2342 /* tcp_log_set_id() unlocks the INP. */ 2343 break; 2344 2345 case TCP_LOGDUMP: 2346 case TCP_LOGDUMPID: 2347 INP_WUNLOCK(inp); 2348 error = 2349 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2350 if (error) 2351 break; 2352 buf[sopt->sopt_valsize] = '\0'; 2353 INP_WLOCK_RECHECK(inp); 2354 if (sopt->sopt_name == TCP_LOGDUMP) { 2355 error = tcp_log_dump_tp_logbuf(tp, buf, 2356 M_WAITOK, true); 2357 INP_WUNLOCK(inp); 2358 } else { 2359 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2360 /* 2361 * tcp_log_dump_tp_bucket_logbufs() drops the 2362 * INP lock. 2363 */ 2364 } 2365 break; 2366#endif 2367 2368 default: 2369 INP_WUNLOCK(inp); 2370 error = ENOPROTOOPT; 2371 break; 2372 } 2373 break; 2374 2375 case SOPT_GET: 2376 tp = intotcpcb(inp); 2377 switch (sopt->sopt_name) { 2378#if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2379 case TCP_MD5SIG: 2380 if (!TCPMD5_ENABLED()) { 2381 INP_WUNLOCK(inp); 2382 return (ENOPROTOOPT); 2383 } 2384 error = TCPMD5_PCBCTL(inp, sopt); 2385 break; 2386#endif 2387 2388 case TCP_NODELAY: 2389 optval = tp->t_flags & TF_NODELAY; 2390 INP_WUNLOCK(inp); 2391 error = sooptcopyout(sopt, &optval, sizeof optval); 2392 break; 2393 case TCP_MAXSEG: 2394 optval = tp->t_maxseg; 2395 INP_WUNLOCK(inp); 2396 error = sooptcopyout(sopt, &optval, sizeof optval); 2397 break; 2398 case TCP_REMOTE_UDP_ENCAPS_PORT: 2399 optval = ntohs(tp->t_port); 2400 INP_WUNLOCK(inp); 2401 error = sooptcopyout(sopt, &optval, sizeof optval); 2402 break; 2403 case TCP_NOOPT: 2404 optval = tp->t_flags & TF_NOOPT; 2405 INP_WUNLOCK(inp); 2406 error = sooptcopyout(sopt, &optval, sizeof optval); 2407 break; 2408 case TCP_NOPUSH: 2409 optval = tp->t_flags & TF_NOPUSH; 2410 INP_WUNLOCK(inp); 2411 error = sooptcopyout(sopt, &optval, sizeof optval); 2412 break; 2413 case TCP_INFO: 2414 tcp_fill_info(tp, &ti); 2415 INP_WUNLOCK(inp); 2416 error = sooptcopyout(sopt, &ti, sizeof ti); 2417 break; 2418 case TCP_STATS: 2419 { 2420#ifdef STATS 2421 int nheld; 2422 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2423 2424 error = 0; 2425 socklen_t outsbsz = sopt->sopt_valsize; 2426 if (tp->t_stats == NULL) 2427 error = ENOENT; 2428 else if (outsbsz >= tp->t_stats->cursz) 2429 outsbsz = tp->t_stats->cursz; 2430 else if (outsbsz >= sizeof(struct statsblob)) 2431 outsbsz = sizeof(struct statsblob); 2432 else 2433 error = EINVAL; 2434 INP_WUNLOCK(inp); 2435 if (error) 2436 break; 2437 2438 sbp = sopt->sopt_val; 2439 nheld = atop(round_page(((vm_offset_t)sbp) + 2440 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2441 vm_page_t ma[nheld]; 2442 if (vm_fault_quick_hold_pages( 2443 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2444 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2445 nheld) < 0) { 2446 error = EFAULT; 2447 break; 2448 } 2449 2450 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2451 SIZEOF_MEMBER(struct statsblob, flags)))) 2452 goto unhold; 2453 2454 INP_WLOCK_RECHECK(inp); 2455 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2456 sbflags | SB_CLONE_USRDSTNOFAULT); 2457 INP_WUNLOCK(inp); 2458 sopt->sopt_valsize = outsbsz; 2459unhold: 2460 vm_page_unhold_pages(ma, nheld); 2461#else 2462 INP_WUNLOCK(inp); 2463 error = EOPNOTSUPP; 2464#endif /* !STATS */ 2465 break; 2466 } 2467 case TCP_CONGESTION: 2468 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2469 INP_WUNLOCK(inp); 2470 error = sooptcopyout(sopt, buf, len + 1); 2471 break; 2472 case TCP_KEEPIDLE: 2473 case TCP_KEEPINTVL: 2474 case TCP_KEEPINIT: 2475 case TCP_KEEPCNT: 2476 switch (sopt->sopt_name) { 2477 case TCP_KEEPIDLE: 2478 ui = TP_KEEPIDLE(tp) / hz; 2479 break; 2480 case TCP_KEEPINTVL: 2481 ui = TP_KEEPINTVL(tp) / hz; 2482 break; 2483 case TCP_KEEPINIT: 2484 ui = TP_KEEPINIT(tp) / hz; 2485 break; 2486 case TCP_KEEPCNT: 2487 ui = TP_KEEPCNT(tp); 2488 break; 2489 } 2490 INP_WUNLOCK(inp); 2491 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2492 break; 2493#ifdef TCPPCAP 2494 case TCP_PCAP_OUT: 2495 case TCP_PCAP_IN: 2496 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2497 &(tp->t_outpkts) : &(tp->t_inpkts)); 2498 INP_WUNLOCK(inp); 2499 error = sooptcopyout(sopt, &optval, sizeof optval); 2500 break; 2501#endif 2502 case TCP_FASTOPEN: 2503 optval = tp->t_flags & TF_FASTOPEN; 2504 INP_WUNLOCK(inp); 2505 error = sooptcopyout(sopt, &optval, sizeof optval); 2506 break; 2507#ifdef TCP_BLACKBOX 2508 case TCP_LOG: 2509 optval = tp->t_logstate; 2510 INP_WUNLOCK(inp); 2511 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2512 break; 2513 case TCP_LOGBUF: 2514 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2515 error = tcp_log_getlogbuf(sopt, tp); 2516 break; 2517 case TCP_LOGID: 2518 len = tcp_log_get_id(tp, buf); 2519 INP_WUNLOCK(inp); 2520 error = sooptcopyout(sopt, buf, len + 1); 2521 break; 2522 case TCP_LOGDUMP: 2523 case TCP_LOGDUMPID: 2524 INP_WUNLOCK(inp); 2525 error = EINVAL; 2526 break; 2527#endif 2528#ifdef KERN_TLS 2529 case TCP_TXTLS_MODE: 2530 optval = ktls_get_tx_mode(so); 2531 INP_WUNLOCK(inp); 2532 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2533 break; 2534 case TCP_RXTLS_MODE: 2535 optval = ktls_get_rx_mode(so); 2536 INP_WUNLOCK(inp); 2537 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2538 break; 2539#endif 2540 default: 2541 INP_WUNLOCK(inp); 2542 error = ENOPROTOOPT; 2543 break; 2544 } 2545 break; 2546 } 2547 return (error); 2548} 2549#undef INP_WLOCK_RECHECK 2550#undef INP_WLOCK_RECHECK_CLEANUP 2551 2552/* 2553 * Initiate (or continue) disconnect. 2554 * If embryonic state, just send reset (once). 2555 * If in ``let data drain'' option and linger null, just drop. 2556 * Otherwise (hard), mark socket disconnecting and drop 2557 * current input data; switch states based on user close, and 2558 * send segment to peer (with FIN). 2559 */ 2560static void 2561tcp_disconnect(struct tcpcb *tp) 2562{ 2563 struct inpcb *inp = tp->t_inpcb; 2564 struct socket *so = inp->inp_socket; 2565 2566 NET_EPOCH_ASSERT(); 2567 INP_WLOCK_ASSERT(inp); 2568 2569 /* 2570 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2571 * socket is still open. 2572 */ 2573 if (tp->t_state < TCPS_ESTABLISHED && 2574 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2575 tp = tcp_close(tp); 2576 KASSERT(tp != NULL, 2577 ("tcp_disconnect: tcp_close() returned NULL")); 2578 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2579 tp = tcp_drop(tp, 0); 2580 KASSERT(tp != NULL, 2581 ("tcp_disconnect: tcp_drop() returned NULL")); 2582 } else { 2583 soisdisconnecting(so); 2584 sbflush(&so->so_rcv); 2585 tcp_usrclosed(tp); 2586 if (!(inp->inp_flags & INP_DROPPED)) 2587 tp->t_fb->tfb_tcp_output(tp); 2588 } 2589} 2590 2591/* 2592 * User issued close, and wish to trail through shutdown states: 2593 * if never received SYN, just forget it. If got a SYN from peer, 2594 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2595 * If already got a FIN from peer, then almost done; go to LAST_ACK 2596 * state. In all other cases, have already sent FIN to peer (e.g. 2597 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2598 * for peer to send FIN or not respond to keep-alives, etc. 2599 * We can let the user exit from the close as soon as the FIN is acked. 2600 */ 2601static void 2602tcp_usrclosed(struct tcpcb *tp) 2603{ 2604 2605 NET_EPOCH_ASSERT(); 2606 INP_WLOCK_ASSERT(tp->t_inpcb); 2607 2608 switch (tp->t_state) { 2609 case TCPS_LISTEN: 2610#ifdef TCP_OFFLOAD 2611 tcp_offload_listen_stop(tp); 2612#endif 2613 tcp_state_change(tp, TCPS_CLOSED); 2614 /* FALLTHROUGH */ 2615 case TCPS_CLOSED: 2616 tp = tcp_close(tp); 2617 /* 2618 * tcp_close() should never return NULL here as the socket is 2619 * still open. 2620 */ 2621 KASSERT(tp != NULL, 2622 ("tcp_usrclosed: tcp_close() returned NULL")); 2623 break; 2624 2625 case TCPS_SYN_SENT: 2626 case TCPS_SYN_RECEIVED: 2627 tp->t_flags |= TF_NEEDFIN; 2628 break; 2629 2630 case TCPS_ESTABLISHED: 2631 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2632 break; 2633 2634 case TCPS_CLOSE_WAIT: 2635 tcp_state_change(tp, TCPS_LAST_ACK); 2636 break; 2637 } 2638 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2639 soisdisconnected(tp->t_inpcb->inp_socket); 2640 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2641 if (tp->t_state == TCPS_FIN_WAIT_2) { 2642 int timeout; 2643 2644 timeout = (tcp_fast_finwait2_recycle) ? 2645 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2646 tcp_timer_activate(tp, TT_2MSL, timeout); 2647 } 2648 } 2649} 2650 2651#ifdef DDB 2652static void 2653db_print_indent(int indent) 2654{ 2655 int i; 2656 2657 for (i = 0; i < indent; i++) 2658 db_printf(" "); 2659} 2660 2661static void 2662db_print_tstate(int t_state) 2663{ 2664 2665 switch (t_state) { 2666 case TCPS_CLOSED: 2667 db_printf("TCPS_CLOSED"); 2668 return; 2669 2670 case TCPS_LISTEN: 2671 db_printf("TCPS_LISTEN"); 2672 return; 2673 2674 case TCPS_SYN_SENT: 2675 db_printf("TCPS_SYN_SENT"); 2676 return; 2677 2678 case TCPS_SYN_RECEIVED: 2679 db_printf("TCPS_SYN_RECEIVED"); 2680 return; 2681 2682 case TCPS_ESTABLISHED: 2683 db_printf("TCPS_ESTABLISHED"); 2684 return; 2685 2686 case TCPS_CLOSE_WAIT: 2687 db_printf("TCPS_CLOSE_WAIT"); 2688 return; 2689 2690 case TCPS_FIN_WAIT_1: 2691 db_printf("TCPS_FIN_WAIT_1"); 2692 return; 2693 2694 case TCPS_CLOSING: 2695 db_printf("TCPS_CLOSING"); 2696 return; 2697 2698 case TCPS_LAST_ACK: 2699 db_printf("TCPS_LAST_ACK"); 2700 return; 2701 2702 case TCPS_FIN_WAIT_2: 2703 db_printf("TCPS_FIN_WAIT_2"); 2704 return; 2705 2706 case TCPS_TIME_WAIT: 2707 db_printf("TCPS_TIME_WAIT"); 2708 return; 2709 2710 default: 2711 db_printf("unknown"); 2712 return; 2713 } 2714} 2715 2716static void 2717db_print_tflags(u_int t_flags) 2718{ 2719 int comma; 2720 2721 comma = 0; 2722 if (t_flags & TF_ACKNOW) { 2723 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2724 comma = 1; 2725 } 2726 if (t_flags & TF_DELACK) { 2727 db_printf("%sTF_DELACK", comma ? ", " : ""); 2728 comma = 1; 2729 } 2730 if (t_flags & TF_NODELAY) { 2731 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2732 comma = 1; 2733 } 2734 if (t_flags & TF_NOOPT) { 2735 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2736 comma = 1; 2737 } 2738 if (t_flags & TF_SENTFIN) { 2739 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2740 comma = 1; 2741 } 2742 if (t_flags & TF_REQ_SCALE) { 2743 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2744 comma = 1; 2745 } 2746 if (t_flags & TF_RCVD_SCALE) { 2747 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2748 comma = 1; 2749 } 2750 if (t_flags & TF_REQ_TSTMP) { 2751 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2752 comma = 1; 2753 } 2754 if (t_flags & TF_RCVD_TSTMP) { 2755 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2756 comma = 1; 2757 } 2758 if (t_flags & TF_SACK_PERMIT) { 2759 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2760 comma = 1; 2761 } 2762 if (t_flags & TF_NEEDSYN) { 2763 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2764 comma = 1; 2765 } 2766 if (t_flags & TF_NEEDFIN) { 2767 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2768 comma = 1; 2769 } 2770 if (t_flags & TF_NOPUSH) { 2771 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2772 comma = 1; 2773 } 2774 if (t_flags & TF_MORETOCOME) { 2775 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2776 comma = 1; 2777 } 2778 if (t_flags & TF_LQ_OVERFLOW) { 2779 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2780 comma = 1; 2781 } 2782 if (t_flags & TF_LASTIDLE) { 2783 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2784 comma = 1; 2785 } 2786 if (t_flags & TF_RXWIN0SENT) { 2787 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2788 comma = 1; 2789 } 2790 if (t_flags & TF_FASTRECOVERY) { 2791 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2792 comma = 1; 2793 } 2794 if (t_flags & TF_CONGRECOVERY) { 2795 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2796 comma = 1; 2797 } 2798 if (t_flags & TF_WASFRECOVERY) { 2799 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2800 comma = 1; 2801 } 2802 if (t_flags & TF_SIGNATURE) { 2803 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2804 comma = 1; 2805 } 2806 if (t_flags & TF_FORCEDATA) { 2807 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2808 comma = 1; 2809 } 2810 if (t_flags & TF_TSO) { 2811 db_printf("%sTF_TSO", comma ? ", " : ""); 2812 comma = 1; 2813 } 2814 if (t_flags & TF_FASTOPEN) { 2815 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2816 comma = 1; 2817 } 2818} 2819 2820static void 2821db_print_tflags2(u_int t_flags2) 2822{ 2823 int comma; 2824 2825 comma = 0; 2826 if (t_flags2 & TF2_ECN_PERMIT) { 2827 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : ""); 2828 comma = 1; 2829 } 2830} 2831 2832static void 2833db_print_toobflags(char t_oobflags) 2834{ 2835 int comma; 2836 2837 comma = 0; 2838 if (t_oobflags & TCPOOB_HAVEDATA) { 2839 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2840 comma = 1; 2841 } 2842 if (t_oobflags & TCPOOB_HADDATA) { 2843 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2844 comma = 1; 2845 } 2846} 2847 2848static void 2849db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2850{ 2851 2852 db_print_indent(indent); 2853 db_printf("%s at %p\n", name, tp); 2854 2855 indent += 2; 2856 2857 db_print_indent(indent); 2858 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2859 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2860 2861 db_print_indent(indent); 2862 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2863 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2864 2865 db_print_indent(indent); 2866 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2867 &tp->t_timers->tt_delack, tp->t_inpcb); 2868 2869 db_print_indent(indent); 2870 db_printf("t_state: %d (", tp->t_state); 2871 db_print_tstate(tp->t_state); 2872 db_printf(")\n"); 2873 2874 db_print_indent(indent); 2875 db_printf("t_flags: 0x%x (", tp->t_flags); 2876 db_print_tflags(tp->t_flags); 2877 db_printf(")\n"); 2878 2879 db_print_indent(indent); 2880 db_printf("t_flags2: 0x%x (", tp->t_flags2); 2881 db_print_tflags2(tp->t_flags2); 2882 db_printf(")\n"); 2883 2884 db_print_indent(indent); 2885 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2886 tp->snd_una, tp->snd_max, tp->snd_nxt); 2887 2888 db_print_indent(indent); 2889 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2890 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2891 2892 db_print_indent(indent); 2893 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2894 tp->iss, tp->irs, tp->rcv_nxt); 2895 2896 db_print_indent(indent); 2897 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2898 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2899 2900 db_print_indent(indent); 2901 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2902 tp->snd_wnd, tp->snd_cwnd); 2903 2904 db_print_indent(indent); 2905 db_printf("snd_ssthresh: %u snd_recover: " 2906 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2907 2908 db_print_indent(indent); 2909 db_printf("t_rcvtime: %u t_startime: %u\n", 2910 tp->t_rcvtime, tp->t_starttime); 2911 2912 db_print_indent(indent); 2913 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2914 tp->t_rtttime, tp->t_rtseq); 2915 2916 db_print_indent(indent); 2917 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2918 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2919 2920 db_print_indent(indent); 2921 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2922 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2923 tp->t_rttbest); 2924 2925 db_print_indent(indent); 2926 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2927 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2928 2929 db_print_indent(indent); 2930 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2931 db_print_toobflags(tp->t_oobflags); 2932 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2933 2934 db_print_indent(indent); 2935 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2936 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2937 2938 db_print_indent(indent); 2939 db_printf("ts_recent: %u ts_recent_age: %u\n", 2940 tp->ts_recent, tp->ts_recent_age); 2941 2942 db_print_indent(indent); 2943 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2944 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2945 2946 db_print_indent(indent); 2947 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2948 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2949 tp->snd_recover_prev, tp->t_badrxtwin); 2950 2951 db_print_indent(indent); 2952 db_printf("snd_numholes: %d snd_holes first: %p\n", 2953 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2954 2955 db_print_indent(indent); 2956 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n", 2957 tp->snd_fack, tp->rcv_numsacks); 2958 2959 /* Skip sackblks, sackhint. */ 2960 2961 db_print_indent(indent); 2962 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2963 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2964} 2965 2966DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2967{ 2968 struct tcpcb *tp; 2969 2970 if (!have_addr) { 2971 db_printf("usage: show tcpcb <addr>\n"); 2972 return; 2973 } 2974 tp = (struct tcpcb *)addr; 2975 2976 db_print_tcpcb(tp, "tcpcb", 0); 2977} 2978#endif 2979