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 125 static int tcp_connect(struct tcpcb *, struct sockaddr *, 126 struct thread *td); 127 #endif /* INET */ 128 #ifdef INET6 129 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 130 struct thread *td); 131 #endif /* INET6 */ 132 static void tcp_disconnect(struct tcpcb *); 133 static void tcp_usrclosed(struct tcpcb *); 134 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 135 136 static 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 */ 153 VNET_DEFINE(int, tcp_require_unique_port) = 0; 154 SYSCTL_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 */ 163 static int 164 tcp_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); 207 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 208 so->so_linger = TCP_LINGERTIME; 209 out: 210 TCPDEBUG2(PRU_ATTACH); 211 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 212 return (error); 213 } 214 215 /* 216 * tcp_usr_detach is called when the socket layer loses its final reference 217 * to the socket, be it a file descriptor reference, a reference from TCP, 218 * etc. At this point, there is only one case in which we will keep around 219 * inpcb state: time wait. 220 */ 221 static void 222 tcp_usr_detach(struct socket *so) 223 { 224 struct inpcb *inp; 225 struct tcpcb *tp; 226 227 inp = sotoinpcb(so); 228 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 229 INP_WLOCK(inp); 230 KASSERT(so->so_pcb == inp && inp->inp_socket == so, 231 ("%s: socket %p inp %p mismatch", __func__, so, inp)); 232 233 tp = intotcpcb(inp); 234 235 if (inp->inp_flags & INP_TIMEWAIT) { 236 /* 237 * There are two cases to handle: one in which the time wait 238 * state is being discarded (INP_DROPPED), and one in which 239 * this connection will remain in timewait. In the former, 240 * it is time to discard all state (except tcptw, which has 241 * already been discarded by the timewait close code, which 242 * should be further up the call stack somewhere). In the 243 * latter case, we detach from the socket, but leave the pcb 244 * present until timewait ends. 245 * 246 * XXXRW: Would it be cleaner to free the tcptw here? 247 * 248 * Astute question indeed, from twtcp perspective there are 249 * four cases to consider: 250 * 251 * #1 tcp_usr_detach is called at tcptw creation time by 252 * tcp_twstart, then do not discard the newly created tcptw 253 * and leave inpcb present until timewait ends 254 * #2 tcp_usr_detach is called at tcptw creation time by 255 * tcp_twstart, but connection is local and tw will be 256 * discarded immediately 257 * #3 tcp_usr_detach is called at timewait end (or reuse) by 258 * tcp_twclose, then the tcptw has already been discarded 259 * (or reused) and inpcb is freed here 260 * #4 tcp_usr_detach is called() after timewait ends (or reuse) 261 * (e.g. by soclose), then tcptw has already been discarded 262 * (or reused) and inpcb is freed here 263 * 264 * In all three cases the tcptw should not be freed here. 265 */ 266 if (inp->inp_flags & INP_DROPPED) { 267 in_pcbdetach(inp); 268 if (__predict_true(tp == NULL)) { 269 in_pcbfree(inp); 270 } else { 271 /* 272 * This case should not happen as in TIMEWAIT 273 * state the inp should not be destroyed before 274 * its tcptw. If INVARIANTS is defined, panic. 275 */ 276 #ifdef INVARIANTS 277 panic("%s: Panic before an inp double-free: " 278 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 279 , __func__); 280 #else 281 log(LOG_ERR, "%s: Avoid an inp double-free: " 282 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 283 , __func__); 284 #endif 285 INP_WUNLOCK(inp); 286 } 287 } else { 288 in_pcbdetach(inp); 289 INP_WUNLOCK(inp); 290 } 291 } else { 292 /* 293 * If the connection is not in timewait, we consider two 294 * two conditions: one in which no further processing is 295 * necessary (dropped || embryonic), and one in which TCP is 296 * not yet done, but no longer requires the socket, so the 297 * pcb will persist for the time being. 298 * 299 * XXXRW: Does the second case still occur? 300 */ 301 if (inp->inp_flags & INP_DROPPED || 302 tp->t_state < TCPS_SYN_SENT) { 303 tcp_discardcb(tp); 304 in_pcbdetach(inp); 305 in_pcbfree(inp); 306 } else { 307 in_pcbdetach(inp); 308 INP_WUNLOCK(inp); 309 } 310 } 311 } 312 313 #ifdef INET 314 /* 315 * Give the socket an address. 316 */ 317 static int 318 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 319 { 320 int error = 0; 321 struct inpcb *inp; 322 struct tcpcb *tp = NULL; 323 struct sockaddr_in *sinp; 324 325 sinp = (struct sockaddr_in *)nam; 326 if (nam->sa_len != sizeof (*sinp)) 327 return (EINVAL); 328 /* 329 * Must check for multicast addresses and disallow binding 330 * to them. 331 */ 332 if (sinp->sin_family == AF_INET && 333 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 334 return (EAFNOSUPPORT); 335 336 TCPDEBUG0; 337 inp = sotoinpcb(so); 338 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 339 INP_WLOCK(inp); 340 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 341 error = EINVAL; 342 goto out; 343 } 344 tp = intotcpcb(inp); 345 TCPDEBUG1(); 346 INP_HASH_WLOCK(&V_tcbinfo); 347 error = in_pcbbind(inp, nam, td->td_ucred); 348 INP_HASH_WUNLOCK(&V_tcbinfo); 349 out: 350 TCPDEBUG2(PRU_BIND); 351 TCP_PROBE2(debug__user, tp, PRU_BIND); 352 INP_WUNLOCK(inp); 353 354 return (error); 355 } 356 #endif /* INET */ 357 358 #ifdef INET6 359 static int 360 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 361 { 362 int error = 0; 363 struct inpcb *inp; 364 struct tcpcb *tp = NULL; 365 struct sockaddr_in6 *sin6; 366 u_char vflagsav; 367 368 sin6 = (struct sockaddr_in6 *)nam; 369 if (nam->sa_len != sizeof (*sin6)) 370 return (EINVAL); 371 /* 372 * Must check for multicast addresses and disallow binding 373 * to them. 374 */ 375 if (sin6->sin6_family == AF_INET6 && 376 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 377 return (EAFNOSUPPORT); 378 379 TCPDEBUG0; 380 inp = sotoinpcb(so); 381 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 382 INP_WLOCK(inp); 383 vflagsav = inp->inp_vflag; 384 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 385 error = EINVAL; 386 goto out; 387 } 388 tp = intotcpcb(inp); 389 TCPDEBUG1(); 390 INP_HASH_WLOCK(&V_tcbinfo); 391 inp->inp_vflag &= ~INP_IPV4; 392 inp->inp_vflag |= INP_IPV6; 393 #ifdef INET 394 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 395 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 396 inp->inp_vflag |= INP_IPV4; 397 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 398 struct sockaddr_in sin; 399 400 in6_sin6_2_sin(&sin, sin6); 401 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 402 error = EAFNOSUPPORT; 403 INP_HASH_WUNLOCK(&V_tcbinfo); 404 goto out; 405 } 406 inp->inp_vflag |= INP_IPV4; 407 inp->inp_vflag &= ~INP_IPV6; 408 error = in_pcbbind(inp, (struct sockaddr *)&sin, 409 td->td_ucred); 410 INP_HASH_WUNLOCK(&V_tcbinfo); 411 goto out; 412 } 413 } 414 #endif 415 error = in6_pcbbind(inp, nam, td->td_ucred); 416 INP_HASH_WUNLOCK(&V_tcbinfo); 417 out: 418 if (error != 0) 419 inp->inp_vflag = vflagsav; 420 TCPDEBUG2(PRU_BIND); 421 TCP_PROBE2(debug__user, tp, PRU_BIND); 422 INP_WUNLOCK(inp); 423 return (error); 424 } 425 #endif /* INET6 */ 426 427 #ifdef INET 428 /* 429 * Prepare to accept connections. 430 */ 431 static int 432 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 433 { 434 int error = 0; 435 struct inpcb *inp; 436 struct tcpcb *tp = NULL; 437 438 TCPDEBUG0; 439 inp = sotoinpcb(so); 440 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 441 INP_WLOCK(inp); 442 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 443 error = EINVAL; 444 goto out; 445 } 446 tp = intotcpcb(inp); 447 TCPDEBUG1(); 448 SOCK_LOCK(so); 449 error = solisten_proto_check(so); 450 INP_HASH_WLOCK(&V_tcbinfo); 451 if (error == 0 && inp->inp_lport == 0) 452 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 453 INP_HASH_WUNLOCK(&V_tcbinfo); 454 if (error == 0) { 455 tcp_state_change(tp, TCPS_LISTEN); 456 solisten_proto(so, backlog); 457 #ifdef TCP_OFFLOAD 458 if ((so->so_options & SO_NO_OFFLOAD) == 0) 459 tcp_offload_listen_start(tp); 460 #endif 461 } 462 SOCK_UNLOCK(so); 463 464 if (IS_FASTOPEN(tp->t_flags)) 465 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 466 467 out: 468 TCPDEBUG2(PRU_LISTEN); 469 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 470 INP_WUNLOCK(inp); 471 return (error); 472 } 473 #endif /* INET */ 474 475 #ifdef INET6 476 static int 477 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 478 { 479 int error = 0; 480 struct inpcb *inp; 481 struct tcpcb *tp = NULL; 482 u_char vflagsav; 483 484 TCPDEBUG0; 485 inp = sotoinpcb(so); 486 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 487 INP_WLOCK(inp); 488 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 489 error = EINVAL; 490 goto out; 491 } 492 vflagsav = inp->inp_vflag; 493 tp = intotcpcb(inp); 494 TCPDEBUG1(); 495 SOCK_LOCK(so); 496 error = solisten_proto_check(so); 497 INP_HASH_WLOCK(&V_tcbinfo); 498 if (error == 0 && inp->inp_lport == 0) { 499 inp->inp_vflag &= ~INP_IPV4; 500 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 501 inp->inp_vflag |= INP_IPV4; 502 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 503 } 504 INP_HASH_WUNLOCK(&V_tcbinfo); 505 if (error == 0) { 506 tcp_state_change(tp, TCPS_LISTEN); 507 solisten_proto(so, backlog); 508 #ifdef TCP_OFFLOAD 509 if ((so->so_options & SO_NO_OFFLOAD) == 0) 510 tcp_offload_listen_start(tp); 511 #endif 512 } 513 SOCK_UNLOCK(so); 514 515 if (IS_FASTOPEN(tp->t_flags)) 516 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 517 518 if (error != 0) 519 inp->inp_vflag = vflagsav; 520 521 out: 522 TCPDEBUG2(PRU_LISTEN); 523 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 524 INP_WUNLOCK(inp); 525 return (error); 526 } 527 #endif /* INET6 */ 528 529 #ifdef INET 530 /* 531 * Initiate connection to peer. 532 * Create a template for use in transmissions on this connection. 533 * Enter SYN_SENT state, and mark socket as connecting. 534 * Start keep-alive timer, and seed output sequence space. 535 * Send initial segment on connection. 536 */ 537 static int 538 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 539 { 540 struct epoch_tracker et; 541 int error = 0; 542 struct inpcb *inp; 543 struct tcpcb *tp = NULL; 544 struct sockaddr_in *sinp; 545 546 sinp = (struct sockaddr_in *)nam; 547 if (nam->sa_len != sizeof (*sinp)) 548 return (EINVAL); 549 /* 550 * Must disallow TCP ``connections'' to multicast addresses. 551 */ 552 if (sinp->sin_family == AF_INET 553 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 554 return (EAFNOSUPPORT); 555 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 556 return (error); 557 558 TCPDEBUG0; 559 inp = sotoinpcb(so); 560 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 561 INP_WLOCK(inp); 562 if (inp->inp_flags & INP_TIMEWAIT) { 563 error = EADDRINUSE; 564 goto out; 565 } 566 if (inp->inp_flags & INP_DROPPED) { 567 error = ECONNREFUSED; 568 goto out; 569 } 570 tp = intotcpcb(inp); 571 TCPDEBUG1(); 572 NET_EPOCH_ENTER(et); 573 if ((error = tcp_connect(tp, nam, td)) != 0) 574 goto out_in_epoch; 575 #ifdef TCP_OFFLOAD 576 if (registered_toedevs > 0 && 577 (so->so_options & SO_NO_OFFLOAD) == 0 && 578 (error = tcp_offload_connect(so, nam)) == 0) 579 goto out_in_epoch; 580 #endif 581 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 582 error = tp->t_fb->tfb_tcp_output(tp); 583 out_in_epoch: 584 NET_EPOCH_EXIT(et); 585 out: 586 TCPDEBUG2(PRU_CONNECT); 587 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 588 INP_WUNLOCK(inp); 589 return (error); 590 } 591 #endif /* INET */ 592 593 #ifdef INET6 594 static int 595 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 596 { 597 struct epoch_tracker et; 598 int error = 0; 599 struct inpcb *inp; 600 struct tcpcb *tp = NULL; 601 struct sockaddr_in6 *sin6; 602 u_int8_t incflagsav; 603 u_char vflagsav; 604 605 TCPDEBUG0; 606 607 sin6 = (struct sockaddr_in6 *)nam; 608 if (nam->sa_len != sizeof (*sin6)) 609 return (EINVAL); 610 /* 611 * Must disallow TCP ``connections'' to multicast addresses. 612 */ 613 if (sin6->sin6_family == AF_INET6 614 && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 615 return (EAFNOSUPPORT); 616 617 inp = sotoinpcb(so); 618 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 619 INP_WLOCK(inp); 620 vflagsav = inp->inp_vflag; 621 incflagsav = inp->inp_inc.inc_flags; 622 if (inp->inp_flags & INP_TIMEWAIT) { 623 error = EADDRINUSE; 624 goto out; 625 } 626 if (inp->inp_flags & INP_DROPPED) { 627 error = ECONNREFUSED; 628 goto out; 629 } 630 tp = intotcpcb(inp); 631 TCPDEBUG1(); 632 #ifdef INET 633 /* 634 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 635 * therefore probably require the hash lock, which isn't held here. 636 * Is this a significant problem? 637 */ 638 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 639 struct sockaddr_in sin; 640 641 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 642 error = EINVAL; 643 goto out; 644 } 645 if ((inp->inp_vflag & INP_IPV4) == 0) { 646 error = EAFNOSUPPORT; 647 goto out; 648 } 649 650 in6_sin6_2_sin(&sin, sin6); 651 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 652 error = EAFNOSUPPORT; 653 goto out; 654 } 655 if ((error = prison_remote_ip4(td->td_ucred, 656 &sin.sin_addr)) != 0) 657 goto out; 658 inp->inp_vflag |= INP_IPV4; 659 inp->inp_vflag &= ~INP_IPV6; 660 NET_EPOCH_ENTER(et); 661 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 662 goto out_in_epoch; 663 #ifdef TCP_OFFLOAD 664 if (registered_toedevs > 0 && 665 (so->so_options & SO_NO_OFFLOAD) == 0 && 666 (error = tcp_offload_connect(so, nam)) == 0) 667 goto out_in_epoch; 668 #endif 669 error = tp->t_fb->tfb_tcp_output(tp); 670 goto out_in_epoch; 671 } else { 672 if ((inp->inp_vflag & INP_IPV6) == 0) { 673 error = EAFNOSUPPORT; 674 goto out; 675 } 676 } 677 #endif 678 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 679 goto out; 680 inp->inp_vflag &= ~INP_IPV4; 681 inp->inp_vflag |= INP_IPV6; 682 inp->inp_inc.inc_flags |= INC_ISIPV6; 683 if ((error = tcp6_connect(tp, nam, td)) != 0) 684 goto out; 685 #ifdef TCP_OFFLOAD 686 if (registered_toedevs > 0 && 687 (so->so_options & SO_NO_OFFLOAD) == 0 && 688 (error = tcp_offload_connect(so, nam)) == 0) 689 goto out; 690 #endif 691 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 692 NET_EPOCH_ENTER(et); 693 error = tp->t_fb->tfb_tcp_output(tp); 694 #ifdef INET 695 out_in_epoch: 696 #endif 697 NET_EPOCH_EXIT(et); 698 out: 699 /* 700 * If the implicit bind in the connect call fails, restore 701 * the flags we modified. 702 */ 703 if (error != 0 && inp->inp_lport == 0) { 704 inp->inp_vflag = vflagsav; 705 inp->inp_inc.inc_flags = incflagsav; 706 } 707 708 TCPDEBUG2(PRU_CONNECT); 709 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 710 INP_WUNLOCK(inp); 711 return (error); 712 } 713 #endif /* INET6 */ 714 715 /* 716 * Initiate disconnect from peer. 717 * If connection never passed embryonic stage, just drop; 718 * else if don't need to let data drain, then can just drop anyways, 719 * else have to begin TCP shutdown process: mark socket disconnecting, 720 * drain unread data, state switch to reflect user close, and 721 * send segment (e.g. FIN) to peer. Socket will be really disconnected 722 * when peer sends FIN and acks ours. 723 * 724 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 725 */ 726 static int 727 tcp_usr_disconnect(struct socket *so) 728 { 729 struct inpcb *inp; 730 struct tcpcb *tp = NULL; 731 struct epoch_tracker et; 732 int error = 0; 733 734 TCPDEBUG0; 735 NET_EPOCH_ENTER(et); 736 inp = sotoinpcb(so); 737 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 738 INP_WLOCK(inp); 739 if (inp->inp_flags & INP_TIMEWAIT) 740 goto out; 741 if (inp->inp_flags & INP_DROPPED) { 742 error = ECONNRESET; 743 goto out; 744 } 745 tp = intotcpcb(inp); 746 TCPDEBUG1(); 747 tcp_disconnect(tp); 748 out: 749 TCPDEBUG2(PRU_DISCONNECT); 750 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 751 INP_WUNLOCK(inp); 752 NET_EPOCH_EXIT(et); 753 return (error); 754 } 755 756 #ifdef INET 757 /* 758 * Accept a connection. Essentially all the work is done at higher levels; 759 * just return the address of the peer, storing through addr. 760 */ 761 static int 762 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 763 { 764 int error = 0; 765 struct inpcb *inp = NULL; 766 struct tcpcb *tp = NULL; 767 struct in_addr addr; 768 in_port_t port = 0; 769 TCPDEBUG0; 770 771 if (so->so_state & SS_ISDISCONNECTED) 772 return (ECONNABORTED); 773 774 inp = sotoinpcb(so); 775 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 776 INP_WLOCK(inp); 777 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 778 error = ECONNABORTED; 779 goto out; 780 } 781 tp = intotcpcb(inp); 782 TCPDEBUG1(); 783 784 /* 785 * We inline in_getpeeraddr and COMMON_END here, so that we can 786 * copy the data of interest and defer the malloc until after we 787 * release the lock. 788 */ 789 port = inp->inp_fport; 790 addr = inp->inp_faddr; 791 792 out: 793 TCPDEBUG2(PRU_ACCEPT); 794 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 795 INP_WUNLOCK(inp); 796 if (error == 0) 797 *nam = in_sockaddr(port, &addr); 798 return error; 799 } 800 #endif /* INET */ 801 802 #ifdef INET6 803 static int 804 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 805 { 806 struct inpcb *inp = NULL; 807 int error = 0; 808 struct tcpcb *tp = NULL; 809 struct in_addr addr; 810 struct in6_addr addr6; 811 struct epoch_tracker et; 812 in_port_t port = 0; 813 int v4 = 0; 814 TCPDEBUG0; 815 816 if (so->so_state & SS_ISDISCONNECTED) 817 return (ECONNABORTED); 818 819 inp = sotoinpcb(so); 820 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 821 NET_EPOCH_ENTER(et); 822 INP_WLOCK(inp); 823 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 824 error = ECONNABORTED; 825 goto out; 826 } 827 tp = intotcpcb(inp); 828 TCPDEBUG1(); 829 830 /* 831 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 832 * copy the data of interest and defer the malloc until after we 833 * release the lock. 834 */ 835 if (inp->inp_vflag & INP_IPV4) { 836 v4 = 1; 837 port = inp->inp_fport; 838 addr = inp->inp_faddr; 839 } else { 840 port = inp->inp_fport; 841 addr6 = inp->in6p_faddr; 842 } 843 844 out: 845 TCPDEBUG2(PRU_ACCEPT); 846 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 847 INP_WUNLOCK(inp); 848 NET_EPOCH_EXIT(et); 849 if (error == 0) { 850 if (v4) 851 *nam = in6_v4mapsin6_sockaddr(port, &addr); 852 else 853 *nam = in6_sockaddr(port, &addr6); 854 } 855 return error; 856 } 857 #endif /* INET6 */ 858 859 /* 860 * Mark the connection as being incapable of further output. 861 */ 862 static int 863 tcp_usr_shutdown(struct socket *so) 864 { 865 int error = 0; 866 struct inpcb *inp; 867 struct tcpcb *tp = NULL; 868 struct epoch_tracker et; 869 870 TCPDEBUG0; 871 NET_EPOCH_ENTER(et); 872 inp = sotoinpcb(so); 873 KASSERT(inp != NULL, ("inp == NULL")); 874 INP_WLOCK(inp); 875 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 876 error = ECONNRESET; 877 goto out; 878 } 879 tp = intotcpcb(inp); 880 TCPDEBUG1(); 881 socantsendmore(so); 882 tcp_usrclosed(tp); 883 if (!(inp->inp_flags & INP_DROPPED)) 884 error = tp->t_fb->tfb_tcp_output(tp); 885 886 out: 887 TCPDEBUG2(PRU_SHUTDOWN); 888 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 889 INP_WUNLOCK(inp); 890 NET_EPOCH_EXIT(et); 891 892 return (error); 893 } 894 895 /* 896 * After a receive, possibly send window update to peer. 897 */ 898 static int 899 tcp_usr_rcvd(struct socket *so, int flags) 900 { 901 struct epoch_tracker et; 902 struct inpcb *inp; 903 struct tcpcb *tp = NULL; 904 int error = 0; 905 906 TCPDEBUG0; 907 inp = sotoinpcb(so); 908 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 909 INP_WLOCK(inp); 910 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 911 error = ECONNRESET; 912 goto out; 913 } 914 tp = intotcpcb(inp); 915 TCPDEBUG1(); 916 /* 917 * For passively-created TFO connections, don't attempt a window 918 * update while still in SYN_RECEIVED as this may trigger an early 919 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 920 * application response data, or failing that, when the DELACK timer 921 * expires. 922 */ 923 if (IS_FASTOPEN(tp->t_flags) && 924 (tp->t_state == TCPS_SYN_RECEIVED)) 925 goto out; 926 NET_EPOCH_ENTER(et); 927 #ifdef TCP_OFFLOAD 928 if (tp->t_flags & TF_TOE) 929 tcp_offload_rcvd(tp); 930 else 931 #endif 932 tp->t_fb->tfb_tcp_output(tp); 933 NET_EPOCH_EXIT(et); 934 out: 935 TCPDEBUG2(PRU_RCVD); 936 TCP_PROBE2(debug__user, tp, PRU_RCVD); 937 INP_WUNLOCK(inp); 938 return (error); 939 } 940 941 /* 942 * Do a send by putting data in output queue and updating urgent 943 * marker if URG set. Possibly send more data. Unlike the other 944 * pru_*() routines, the mbuf chains are our responsibility. We 945 * must either enqueue them or free them. The other pru_* routines 946 * generally are caller-frees. 947 */ 948 static int 949 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 950 struct sockaddr *nam, struct mbuf *control, struct thread *td) 951 { 952 struct epoch_tracker et; 953 int error = 0; 954 struct inpcb *inp; 955 struct tcpcb *tp = NULL; 956 #ifdef INET 957 #ifdef INET6 958 struct sockaddr_in sin; 959 #endif 960 struct sockaddr_in *sinp; 961 #endif 962 #ifdef INET6 963 int isipv6; 964 #endif 965 u_int8_t incflagsav; 966 u_char vflagsav; 967 bool restoreflags; 968 TCPDEBUG0; 969 970 /* 971 * We require the pcbinfo "read lock" if we will close the socket 972 * as part of this call. 973 */ 974 NET_EPOCH_ENTER(et); 975 inp = sotoinpcb(so); 976 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 977 INP_WLOCK(inp); 978 vflagsav = inp->inp_vflag; 979 incflagsav = inp->inp_inc.inc_flags; 980 restoreflags = false; 981 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 982 if (control) 983 m_freem(control); 984 /* 985 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 986 * for freeing memory. 987 */ 988 if (m && (flags & PRUS_NOTREADY) == 0) 989 m_freem(m); 990 error = ECONNRESET; 991 goto out; 992 } 993 tp = intotcpcb(inp); 994 if (flags & PRUS_OOB) { 995 if ((error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) { 996 if (control) 997 m_freem(control); 998 if (m && (flags & PRUS_NOTREADY) == 0) 999 m_freem(m); 1000 goto out; 1001 } 1002 } 1003 TCPDEBUG1(); 1004 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 1005 switch (nam->sa_family) { 1006 #ifdef INET 1007 case AF_INET: 1008 sinp = (struct sockaddr_in *)nam; 1009 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 1010 if (m) 1011 m_freem(m); 1012 error = EINVAL; 1013 goto out; 1014 } 1015 if ((inp->inp_vflag & INP_IPV6) != 0) { 1016 if (m) 1017 m_freem(m); 1018 error = EAFNOSUPPORT; 1019 goto out; 1020 } 1021 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 1022 if (m) 1023 m_freem(m); 1024 error = EAFNOSUPPORT; 1025 goto out; 1026 } 1027 if ((error = prison_remote_ip4(td->td_ucred, 1028 &sinp->sin_addr))) { 1029 if (m) 1030 m_freem(m); 1031 goto out; 1032 } 1033 #ifdef INET6 1034 isipv6 = 0; 1035 #endif 1036 break; 1037 #endif /* INET */ 1038 #ifdef INET6 1039 case AF_INET6: 1040 { 1041 struct sockaddr_in6 *sin6; 1042 1043 sin6 = (struct sockaddr_in6 *)nam; 1044 if (sin6->sin6_len != sizeof(*sin6)) { 1045 if (m) 1046 m_freem(m); 1047 error = EINVAL; 1048 goto out; 1049 } 1050 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) { 1051 if (m != NULL) 1052 m_freem(m); 1053 error = EAFNOSUPPORT; 1054 goto out; 1055 } 1056 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1057 if (m) 1058 m_freem(m); 1059 error = EAFNOSUPPORT; 1060 goto out; 1061 } 1062 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1063 #ifdef INET 1064 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1065 error = EINVAL; 1066 if (m) 1067 m_freem(m); 1068 goto out; 1069 } 1070 if ((inp->inp_vflag & INP_IPV4) == 0) { 1071 error = EAFNOSUPPORT; 1072 if (m) 1073 m_freem(m); 1074 goto out; 1075 } 1076 restoreflags = true; 1077 inp->inp_vflag &= ~INP_IPV6; 1078 sinp = &sin; 1079 in6_sin6_2_sin(sinp, sin6); 1080 if (IN_MULTICAST( 1081 ntohl(sinp->sin_addr.s_addr))) { 1082 error = EAFNOSUPPORT; 1083 if (m) 1084 m_freem(m); 1085 goto out; 1086 } 1087 if ((error = prison_remote_ip4(td->td_ucred, 1088 &sinp->sin_addr))) { 1089 if (m) 1090 m_freem(m); 1091 goto out; 1092 } 1093 isipv6 = 0; 1094 #else /* !INET */ 1095 error = EAFNOSUPPORT; 1096 if (m) 1097 m_freem(m); 1098 goto out; 1099 #endif /* INET */ 1100 } else { 1101 if ((inp->inp_vflag & INP_IPV6) == 0) { 1102 if (m) 1103 m_freem(m); 1104 error = EAFNOSUPPORT; 1105 goto out; 1106 } 1107 restoreflags = true; 1108 inp->inp_vflag &= ~INP_IPV4; 1109 inp->inp_inc.inc_flags |= INC_ISIPV6; 1110 if ((error = prison_remote_ip6(td->td_ucred, 1111 &sin6->sin6_addr))) { 1112 if (m) 1113 m_freem(m); 1114 goto out; 1115 } 1116 isipv6 = 1; 1117 } 1118 break; 1119 } 1120 #endif /* INET6 */ 1121 default: 1122 if (m) 1123 m_freem(m); 1124 error = EAFNOSUPPORT; 1125 goto out; 1126 } 1127 } 1128 if (control) { 1129 /* TCP doesn't do control messages (rights, creds, etc) */ 1130 if (control->m_len) { 1131 m_freem(control); 1132 if (m) 1133 m_freem(m); 1134 error = EINVAL; 1135 goto out; 1136 } 1137 m_freem(control); /* empty control, just free it */ 1138 } 1139 if (!(flags & PRUS_OOB)) { 1140 sbappendstream(&so->so_snd, m, flags); 1141 if (nam && tp->t_state < TCPS_SYN_SENT) { 1142 /* 1143 * Do implied connect if not yet connected, 1144 * initialize window to default value, and 1145 * initialize maxseg using peer's cached MSS. 1146 */ 1147 #ifdef INET6 1148 if (isipv6) 1149 error = tcp6_connect(tp, nam, td); 1150 #endif /* INET6 */ 1151 #if defined(INET6) && defined(INET) 1152 else 1153 #endif 1154 #ifdef INET 1155 error = tcp_connect(tp, 1156 (struct sockaddr *)sinp, td); 1157 #endif 1158 /* 1159 * The bind operation in tcp_connect succeeded. We 1160 * no longer want to restore the flags if later 1161 * operations fail. 1162 */ 1163 if (error == 0 || inp->inp_lport != 0) 1164 restoreflags = false; 1165 1166 if (error) 1167 goto out; 1168 if (IS_FASTOPEN(tp->t_flags)) 1169 tcp_fastopen_connect(tp); 1170 else { 1171 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1172 tcp_mss(tp, -1); 1173 } 1174 } 1175 if (flags & PRUS_EOF) { 1176 /* 1177 * Close the send side of the connection after 1178 * the data is sent. 1179 */ 1180 socantsendmore(so); 1181 tcp_usrclosed(tp); 1182 } 1183 if (!(inp->inp_flags & INP_DROPPED) && 1184 !(flags & PRUS_NOTREADY)) { 1185 if (flags & PRUS_MORETOCOME) 1186 tp->t_flags |= TF_MORETOCOME; 1187 error = tp->t_fb->tfb_tcp_output(tp); 1188 if (flags & PRUS_MORETOCOME) 1189 tp->t_flags &= ~TF_MORETOCOME; 1190 } 1191 } else { 1192 /* 1193 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1194 */ 1195 SOCKBUF_LOCK(&so->so_snd); 1196 if (sbspace(&so->so_snd) < -512) { 1197 SOCKBUF_UNLOCK(&so->so_snd); 1198 m_freem(m); 1199 error = ENOBUFS; 1200 goto out; 1201 } 1202 /* 1203 * According to RFC961 (Assigned Protocols), 1204 * the urgent pointer points to the last octet 1205 * of urgent data. We continue, however, 1206 * to consider it to indicate the first octet 1207 * of data past the urgent section. 1208 * Otherwise, snd_up should be one lower. 1209 */ 1210 sbappendstream_locked(&so->so_snd, m, flags); 1211 SOCKBUF_UNLOCK(&so->so_snd); 1212 if (nam && tp->t_state < TCPS_SYN_SENT) { 1213 /* 1214 * Do implied connect if not yet connected, 1215 * initialize window to default value, and 1216 * initialize maxseg using peer's cached MSS. 1217 */ 1218 1219 /* 1220 * Not going to contemplate SYN|URG 1221 */ 1222 if (IS_FASTOPEN(tp->t_flags)) 1223 tp->t_flags &= ~TF_FASTOPEN; 1224 #ifdef INET6 1225 if (isipv6) 1226 error = tcp6_connect(tp, nam, td); 1227 #endif /* INET6 */ 1228 #if defined(INET6) && defined(INET) 1229 else 1230 #endif 1231 #ifdef INET 1232 error = tcp_connect(tp, 1233 (struct sockaddr *)sinp, td); 1234 #endif 1235 /* 1236 * The bind operation in tcp_connect succeeded. We 1237 * no longer want to restore the flags if later 1238 * operations fail. 1239 */ 1240 if (error == 0 || inp->inp_lport != 0) 1241 restoreflags = false; 1242 1243 if (error) 1244 goto out; 1245 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1246 tcp_mss(tp, -1); 1247 } 1248 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1249 if (!(flags & PRUS_NOTREADY)) { 1250 tp->t_flags |= TF_FORCEDATA; 1251 error = tp->t_fb->tfb_tcp_output(tp); 1252 tp->t_flags &= ~TF_FORCEDATA; 1253 } 1254 } 1255 TCP_LOG_EVENT(tp, NULL, 1256 &inp->inp_socket->so_rcv, 1257 &inp->inp_socket->so_snd, 1258 TCP_LOG_USERSEND, error, 1259 0, NULL, false); 1260 out: 1261 /* 1262 * If the request was unsuccessful and we changed flags, 1263 * restore the original flags. 1264 */ 1265 if (error != 0 && restoreflags) { 1266 inp->inp_vflag = vflagsav; 1267 inp->inp_inc.inc_flags = incflagsav; 1268 } 1269 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1270 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1271 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1272 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1273 INP_WUNLOCK(inp); 1274 NET_EPOCH_EXIT(et); 1275 return (error); 1276 } 1277 1278 static int 1279 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1280 { 1281 struct epoch_tracker et; 1282 struct inpcb *inp; 1283 struct tcpcb *tp; 1284 int error; 1285 1286 inp = sotoinpcb(so); 1287 INP_WLOCK(inp); 1288 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1289 INP_WUNLOCK(inp); 1290 mb_free_notready(m, count); 1291 return (ECONNRESET); 1292 } 1293 tp = intotcpcb(inp); 1294 1295 SOCKBUF_LOCK(&so->so_snd); 1296 error = sbready(&so->so_snd, m, count); 1297 SOCKBUF_UNLOCK(&so->so_snd); 1298 if (error == 0) { 1299 NET_EPOCH_ENTER(et); 1300 error = tp->t_fb->tfb_tcp_output(tp); 1301 NET_EPOCH_EXIT(et); 1302 } 1303 INP_WUNLOCK(inp); 1304 1305 return (error); 1306 } 1307 1308 /* 1309 * Abort the TCP. Drop the connection abruptly. 1310 */ 1311 static void 1312 tcp_usr_abort(struct socket *so) 1313 { 1314 struct inpcb *inp; 1315 struct tcpcb *tp = NULL; 1316 struct epoch_tracker et; 1317 TCPDEBUG0; 1318 1319 inp = sotoinpcb(so); 1320 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1321 1322 NET_EPOCH_ENTER(et); 1323 INP_WLOCK(inp); 1324 KASSERT(inp->inp_socket != NULL, 1325 ("tcp_usr_abort: inp_socket == NULL")); 1326 1327 /* 1328 * If we still have full TCP state, and we're not dropped, drop. 1329 */ 1330 if (!(inp->inp_flags & INP_TIMEWAIT) && 1331 !(inp->inp_flags & INP_DROPPED)) { 1332 tp = intotcpcb(inp); 1333 TCPDEBUG1(); 1334 tp = tcp_drop(tp, ECONNABORTED); 1335 if (tp == NULL) 1336 goto dropped; 1337 TCPDEBUG2(PRU_ABORT); 1338 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1339 } 1340 if (!(inp->inp_flags & INP_DROPPED)) { 1341 SOCK_LOCK(so); 1342 so->so_state |= SS_PROTOREF; 1343 SOCK_UNLOCK(so); 1344 inp->inp_flags |= INP_SOCKREF; 1345 } 1346 INP_WUNLOCK(inp); 1347 dropped: 1348 NET_EPOCH_EXIT(et); 1349 } 1350 1351 /* 1352 * TCP socket is closed. Start friendly disconnect. 1353 */ 1354 static void 1355 tcp_usr_close(struct socket *so) 1356 { 1357 struct inpcb *inp; 1358 struct tcpcb *tp = NULL; 1359 struct epoch_tracker et; 1360 TCPDEBUG0; 1361 1362 inp = sotoinpcb(so); 1363 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1364 1365 NET_EPOCH_ENTER(et); 1366 INP_WLOCK(inp); 1367 KASSERT(inp->inp_socket != NULL, 1368 ("tcp_usr_close: inp_socket == NULL")); 1369 1370 /* 1371 * If we still have full TCP state, and we're not dropped, initiate 1372 * a disconnect. 1373 */ 1374 if (!(inp->inp_flags & INP_TIMEWAIT) && 1375 !(inp->inp_flags & INP_DROPPED)) { 1376 tp = intotcpcb(inp); 1377 TCPDEBUG1(); 1378 tcp_disconnect(tp); 1379 TCPDEBUG2(PRU_CLOSE); 1380 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1381 } 1382 if (!(inp->inp_flags & INP_DROPPED)) { 1383 SOCK_LOCK(so); 1384 so->so_state |= SS_PROTOREF; 1385 SOCK_UNLOCK(so); 1386 inp->inp_flags |= INP_SOCKREF; 1387 } 1388 INP_WUNLOCK(inp); 1389 NET_EPOCH_EXIT(et); 1390 } 1391 1392 static int 1393 tcp_pru_options_support(struct tcpcb *tp, int flags) 1394 { 1395 /* 1396 * If the specific TCP stack has a pru_options 1397 * specified then it does not always support 1398 * all the PRU_XX options and we must ask it. 1399 * If the function is not specified then all 1400 * of the PRU_XX options are supported. 1401 */ 1402 int ret = 0; 1403 1404 if (tp->t_fb->tfb_pru_options) { 1405 ret = (*tp->t_fb->tfb_pru_options)(tp, flags); 1406 } 1407 return (ret); 1408 } 1409 1410 /* 1411 * Receive out-of-band data. 1412 */ 1413 static int 1414 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1415 { 1416 int error = 0; 1417 struct inpcb *inp; 1418 struct tcpcb *tp = NULL; 1419 1420 TCPDEBUG0; 1421 inp = sotoinpcb(so); 1422 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1423 INP_WLOCK(inp); 1424 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1425 error = ECONNRESET; 1426 goto out; 1427 } 1428 tp = intotcpcb(inp); 1429 error = tcp_pru_options_support(tp, PRUS_OOB); 1430 if (error) { 1431 goto out; 1432 } 1433 TCPDEBUG1(); 1434 if ((so->so_oobmark == 0 && 1435 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1436 so->so_options & SO_OOBINLINE || 1437 tp->t_oobflags & TCPOOB_HADDATA) { 1438 error = EINVAL; 1439 goto out; 1440 } 1441 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1442 error = EWOULDBLOCK; 1443 goto out; 1444 } 1445 m->m_len = 1; 1446 *mtod(m, caddr_t) = tp->t_iobc; 1447 if ((flags & MSG_PEEK) == 0) 1448 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1449 1450 out: 1451 TCPDEBUG2(PRU_RCVOOB); 1452 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1453 INP_WUNLOCK(inp); 1454 return (error); 1455 } 1456 1457 #ifdef INET 1458 struct pr_usrreqs tcp_usrreqs = { 1459 .pru_abort = tcp_usr_abort, 1460 .pru_accept = tcp_usr_accept, 1461 .pru_attach = tcp_usr_attach, 1462 .pru_bind = tcp_usr_bind, 1463 .pru_connect = tcp_usr_connect, 1464 .pru_control = in_control, 1465 .pru_detach = tcp_usr_detach, 1466 .pru_disconnect = tcp_usr_disconnect, 1467 .pru_listen = tcp_usr_listen, 1468 .pru_peeraddr = in_getpeeraddr, 1469 .pru_rcvd = tcp_usr_rcvd, 1470 .pru_rcvoob = tcp_usr_rcvoob, 1471 .pru_send = tcp_usr_send, 1472 .pru_ready = tcp_usr_ready, 1473 .pru_shutdown = tcp_usr_shutdown, 1474 .pru_sockaddr = in_getsockaddr, 1475 .pru_sosetlabel = in_pcbsosetlabel, 1476 .pru_close = tcp_usr_close, 1477 }; 1478 #endif /* INET */ 1479 1480 #ifdef INET6 1481 struct pr_usrreqs tcp6_usrreqs = { 1482 .pru_abort = tcp_usr_abort, 1483 .pru_accept = tcp6_usr_accept, 1484 .pru_attach = tcp_usr_attach, 1485 .pru_bind = tcp6_usr_bind, 1486 .pru_connect = tcp6_usr_connect, 1487 .pru_control = in6_control, 1488 .pru_detach = tcp_usr_detach, 1489 .pru_disconnect = tcp_usr_disconnect, 1490 .pru_listen = tcp6_usr_listen, 1491 .pru_peeraddr = in6_mapped_peeraddr, 1492 .pru_rcvd = tcp_usr_rcvd, 1493 .pru_rcvoob = tcp_usr_rcvoob, 1494 .pru_send = tcp_usr_send, 1495 .pru_ready = tcp_usr_ready, 1496 .pru_shutdown = tcp_usr_shutdown, 1497 .pru_sockaddr = in6_mapped_sockaddr, 1498 .pru_sosetlabel = in_pcbsosetlabel, 1499 .pru_close = tcp_usr_close, 1500 }; 1501 #endif /* INET6 */ 1502 1503 #ifdef INET 1504 /* 1505 * Common subroutine to open a TCP connection to remote host specified 1506 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1507 * port number if needed. Call in_pcbconnect_setup to do the routing and 1508 * to choose a local host address (interface). If there is an existing 1509 * incarnation of the same connection in TIME-WAIT state and if the remote 1510 * host was sending CC options and if the connection duration was < MSL, then 1511 * truncate the previous TIME-WAIT state and proceed. 1512 * Initialize connection parameters and enter SYN-SENT state. 1513 */ 1514 static int 1515 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1516 { 1517 struct inpcb *inp = tp->t_inpcb, *oinp; 1518 struct socket *so = inp->inp_socket; 1519 struct in_addr laddr; 1520 u_short lport; 1521 int error; 1522 1523 NET_EPOCH_ASSERT(); 1524 INP_WLOCK_ASSERT(inp); 1525 INP_HASH_WLOCK(&V_tcbinfo); 1526 1527 if (V_tcp_require_unique_port && inp->inp_lport == 0) { 1528 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1529 if (error) 1530 goto out; 1531 } 1532 1533 /* 1534 * Cannot simply call in_pcbconnect, because there might be an 1535 * earlier incarnation of this same connection still in 1536 * TIME_WAIT state, creating an ADDRINUSE error. 1537 */ 1538 laddr = inp->inp_laddr; 1539 lport = inp->inp_lport; 1540 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1541 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1542 if (error && oinp == NULL) 1543 goto out; 1544 if (oinp) { 1545 error = EADDRINUSE; 1546 goto out; 1547 } 1548 /* Handle initial bind if it hadn't been done in advance. */ 1549 if (inp->inp_lport == 0) { 1550 inp->inp_lport = lport; 1551 if (in_pcbinshash(inp) != 0) { 1552 inp->inp_lport = 0; 1553 error = EAGAIN; 1554 goto out; 1555 } 1556 } 1557 inp->inp_laddr = laddr; 1558 in_pcbrehash(inp); 1559 INP_HASH_WUNLOCK(&V_tcbinfo); 1560 1561 /* 1562 * Compute window scaling to request: 1563 * Scale to fit into sweet spot. See tcp_syncache.c. 1564 * XXX: This should move to tcp_output(). 1565 */ 1566 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1567 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1568 tp->request_r_scale++; 1569 1570 soisconnecting(so); 1571 TCPSTAT_INC(tcps_connattempt); 1572 tcp_state_change(tp, TCPS_SYN_SENT); 1573 tp->iss = tcp_new_isn(&inp->inp_inc); 1574 if (tp->t_flags & TF_REQ_TSTMP) 1575 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1576 tcp_sendseqinit(tp); 1577 1578 return 0; 1579 1580 out: 1581 INP_HASH_WUNLOCK(&V_tcbinfo); 1582 return (error); 1583 } 1584 #endif /* INET */ 1585 1586 #ifdef INET6 1587 static int 1588 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1589 { 1590 struct inpcb *inp = tp->t_inpcb; 1591 int error; 1592 1593 INP_WLOCK_ASSERT(inp); 1594 INP_HASH_WLOCK(&V_tcbinfo); 1595 1596 if (V_tcp_require_unique_port && inp->inp_lport == 0) { 1597 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1598 if (error) 1599 goto out; 1600 } 1601 error = in6_pcbconnect(inp, nam, td->td_ucred); 1602 if (error != 0) 1603 goto out; 1604 INP_HASH_WUNLOCK(&V_tcbinfo); 1605 1606 /* Compute window scaling to request. */ 1607 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1608 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1609 tp->request_r_scale++; 1610 1611 soisconnecting(inp->inp_socket); 1612 TCPSTAT_INC(tcps_connattempt); 1613 tcp_state_change(tp, TCPS_SYN_SENT); 1614 tp->iss = tcp_new_isn(&inp->inp_inc); 1615 if (tp->t_flags & TF_REQ_TSTMP) 1616 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1617 tcp_sendseqinit(tp); 1618 1619 return 0; 1620 1621 out: 1622 INP_HASH_WUNLOCK(&V_tcbinfo); 1623 return error; 1624 } 1625 #endif /* INET6 */ 1626 1627 /* 1628 * Export TCP internal state information via a struct tcp_info, based on the 1629 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1630 * (TCP state machine, etc). We export all information using FreeBSD-native 1631 * constants -- for example, the numeric values for tcpi_state will differ 1632 * from Linux. 1633 */ 1634 static void 1635 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1636 { 1637 1638 INP_WLOCK_ASSERT(tp->t_inpcb); 1639 bzero(ti, sizeof(*ti)); 1640 1641 ti->tcpi_state = tp->t_state; 1642 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1643 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1644 if (tp->t_flags & TF_SACK_PERMIT) 1645 ti->tcpi_options |= TCPI_OPT_SACK; 1646 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1647 ti->tcpi_options |= TCPI_OPT_WSCALE; 1648 ti->tcpi_snd_wscale = tp->snd_scale; 1649 ti->tcpi_rcv_wscale = tp->rcv_scale; 1650 } 1651 if (tp->t_flags2 & TF2_ECN_PERMIT) 1652 ti->tcpi_options |= TCPI_OPT_ECN; 1653 1654 ti->tcpi_rto = tp->t_rxtcur * tick; 1655 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1656 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1657 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1658 1659 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1660 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1661 1662 /* 1663 * FreeBSD-specific extension fields for tcp_info. 1664 */ 1665 ti->tcpi_rcv_space = tp->rcv_wnd; 1666 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1667 ti->tcpi_snd_wnd = tp->snd_wnd; 1668 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1669 ti->tcpi_snd_nxt = tp->snd_nxt; 1670 ti->tcpi_snd_mss = tp->t_maxseg; 1671 ti->tcpi_rcv_mss = tp->t_maxseg; 1672 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1673 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1674 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1675 #ifdef TCP_OFFLOAD 1676 if (tp->t_flags & TF_TOE) { 1677 ti->tcpi_options |= TCPI_OPT_TOE; 1678 tcp_offload_tcp_info(tp, ti); 1679 } 1680 #endif 1681 } 1682 1683 /* 1684 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1685 * socket option arguments. When it re-acquires the lock after the copy, it 1686 * has to revalidate that the connection is still valid for the socket 1687 * option. 1688 */ 1689 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1690 INP_WLOCK(inp); \ 1691 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1692 INP_WUNLOCK(inp); \ 1693 cleanup; \ 1694 return (ECONNRESET); \ 1695 } \ 1696 tp = intotcpcb(inp); \ 1697 } while(0) 1698 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1699 1700 int 1701 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1702 { 1703 int error; 1704 struct inpcb *inp; 1705 struct tcpcb *tp; 1706 struct tcp_function_block *blk; 1707 struct tcp_function_set fsn; 1708 1709 error = 0; 1710 inp = sotoinpcb(so); 1711 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1712 if (sopt->sopt_level != IPPROTO_TCP) { 1713 #ifdef INET6 1714 if (inp->inp_vflag & INP_IPV6PROTO) { 1715 error = ip6_ctloutput(so, sopt); 1716 /* 1717 * In case of the IPV6_USE_MIN_MTU socket option, 1718 * the INC_IPV6MINMTU flag to announce a corresponding 1719 * MSS during the initial handshake. 1720 * If the TCP connection is not in the front states, 1721 * just reduce the MSS being used. 1722 * This avoids the sending of TCP segments which will 1723 * be fragmented at the IPv6 layer. 1724 */ 1725 if ((error == 0) && 1726 (sopt->sopt_dir == SOPT_SET) && 1727 (sopt->sopt_level == IPPROTO_IPV6) && 1728 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1729 INP_WLOCK(inp); 1730 if ((inp->inp_flags & 1731 (INP_TIMEWAIT | INP_DROPPED))) { 1732 INP_WUNLOCK(inp); 1733 return (ECONNRESET); 1734 } 1735 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1736 tp = intotcpcb(inp); 1737 if ((tp->t_state >= TCPS_SYN_SENT) && 1738 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1739 struct ip6_pktopts *opt; 1740 1741 opt = inp->in6p_outputopts; 1742 if ((opt != NULL) && 1743 (opt->ip6po_minmtu == 1744 IP6PO_MINMTU_ALL)) { 1745 if (tp->t_maxseg > TCP6_MSS) { 1746 tp->t_maxseg = TCP6_MSS; 1747 } 1748 } 1749 } 1750 INP_WUNLOCK(inp); 1751 } 1752 } 1753 #endif /* INET6 */ 1754 #if defined(INET6) && defined(INET) 1755 else 1756 #endif 1757 #ifdef INET 1758 { 1759 error = ip_ctloutput(so, sopt); 1760 } 1761 #endif 1762 return (error); 1763 } 1764 INP_WLOCK(inp); 1765 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1766 INP_WUNLOCK(inp); 1767 return (ECONNRESET); 1768 } 1769 tp = intotcpcb(inp); 1770 /* 1771 * Protect the TCP option TCP_FUNCTION_BLK so 1772 * that a sub-function can *never* overwrite this. 1773 */ 1774 if ((sopt->sopt_dir == SOPT_SET) && 1775 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1776 INP_WUNLOCK(inp); 1777 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1778 sizeof fsn); 1779 if (error) 1780 return (error); 1781 INP_WLOCK_RECHECK(inp); 1782 blk = find_and_ref_tcp_functions(&fsn); 1783 if (blk == NULL) { 1784 INP_WUNLOCK(inp); 1785 return (ENOENT); 1786 } 1787 if (tp->t_fb == blk) { 1788 /* You already have this */ 1789 refcount_release(&blk->tfb_refcnt); 1790 INP_WUNLOCK(inp); 1791 return (0); 1792 } 1793 if (tp->t_state != TCPS_CLOSED) { 1794 /* 1795 * The user has advanced the state 1796 * past the initial point, we may not 1797 * be able to switch. 1798 */ 1799 if (blk->tfb_tcp_handoff_ok != NULL) { 1800 /* 1801 * Does the stack provide a 1802 * query mechanism, if so it may 1803 * still be possible? 1804 */ 1805 error = (*blk->tfb_tcp_handoff_ok)(tp); 1806 } else 1807 error = EINVAL; 1808 if (error) { 1809 refcount_release(&blk->tfb_refcnt); 1810 INP_WUNLOCK(inp); 1811 return(error); 1812 } 1813 } 1814 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1815 refcount_release(&blk->tfb_refcnt); 1816 INP_WUNLOCK(inp); 1817 return (ENOENT); 1818 } 1819 /* 1820 * Release the old refcnt, the 1821 * lookup acquired a ref on the 1822 * new one already. 1823 */ 1824 if (tp->t_fb->tfb_tcp_fb_fini) { 1825 /* 1826 * Tell the stack to cleanup with 0 i.e. 1827 * the tcb is not going away. 1828 */ 1829 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1830 } 1831 #ifdef TCPHPTS 1832 /* Assure that we are not on any hpts */ 1833 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1834 #endif 1835 if (blk->tfb_tcp_fb_init) { 1836 error = (*blk->tfb_tcp_fb_init)(tp); 1837 if (error) { 1838 refcount_release(&blk->tfb_refcnt); 1839 if (tp->t_fb->tfb_tcp_fb_init) { 1840 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1841 /* Fall back failed, drop the connection */ 1842 INP_WUNLOCK(inp); 1843 soabort(so); 1844 return(error); 1845 } 1846 } 1847 goto err_out; 1848 } 1849 } 1850 refcount_release(&tp->t_fb->tfb_refcnt); 1851 tp->t_fb = blk; 1852 #ifdef TCP_OFFLOAD 1853 if (tp->t_flags & TF_TOE) { 1854 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1855 sopt->sopt_name); 1856 } 1857 #endif 1858 err_out: 1859 INP_WUNLOCK(inp); 1860 return (error); 1861 } else if ((sopt->sopt_dir == SOPT_GET) && 1862 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1863 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1864 TCP_FUNCTION_NAME_LEN_MAX); 1865 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1866 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1867 INP_WUNLOCK(inp); 1868 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1869 return (error); 1870 } 1871 /* Pass in the INP locked, called must unlock it */ 1872 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1873 } 1874 1875 /* 1876 * If this assert becomes untrue, we need to change the size of the buf 1877 * variable in tcp_default_ctloutput(). 1878 */ 1879 #ifdef CTASSERT 1880 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1881 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1882 #endif 1883 1884 #ifdef KERN_TLS 1885 static int 1886 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls) 1887 { 1888 struct tls_enable_v0 tls_v0; 1889 int error; 1890 1891 if (sopt->sopt_valsize == sizeof(tls_v0)) { 1892 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0), 1893 sizeof(tls_v0)); 1894 if (error) 1895 return (error); 1896 memset(tls, 0, sizeof(*tls)); 1897 tls->cipher_key = tls_v0.cipher_key; 1898 tls->iv = tls_v0.iv; 1899 tls->auth_key = tls_v0.auth_key; 1900 tls->cipher_algorithm = tls_v0.cipher_algorithm; 1901 tls->cipher_key_len = tls_v0.cipher_key_len; 1902 tls->iv_len = tls_v0.iv_len; 1903 tls->auth_algorithm = tls_v0.auth_algorithm; 1904 tls->auth_key_len = tls_v0.auth_key_len; 1905 tls->flags = tls_v0.flags; 1906 tls->tls_vmajor = tls_v0.tls_vmajor; 1907 tls->tls_vminor = tls_v0.tls_vminor; 1908 return (0); 1909 } 1910 1911 return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls))); 1912 } 1913 #endif 1914 1915 int 1916 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1917 { 1918 int error, opt, optval; 1919 u_int ui; 1920 struct tcp_info ti; 1921 #ifdef KERN_TLS 1922 struct tls_enable tls; 1923 #endif 1924 struct cc_algo *algo; 1925 char *pbuf, buf[TCP_LOG_ID_LEN]; 1926 #ifdef STATS 1927 struct statsblob *sbp; 1928 #endif 1929 size_t len; 1930 1931 /* 1932 * For TCP_CCALGOOPT forward the control to CC module, for both 1933 * SOPT_SET and SOPT_GET. 1934 */ 1935 switch (sopt->sopt_name) { 1936 case TCP_CCALGOOPT: 1937 INP_WUNLOCK(inp); 1938 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 1939 return (EINVAL); 1940 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1941 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1942 sopt->sopt_valsize); 1943 if (error) { 1944 free(pbuf, M_TEMP); 1945 return (error); 1946 } 1947 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1948 if (CC_ALGO(tp)->ctl_output != NULL) 1949 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1950 else 1951 error = ENOENT; 1952 INP_WUNLOCK(inp); 1953 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1954 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1955 free(pbuf, M_TEMP); 1956 return (error); 1957 } 1958 1959 switch (sopt->sopt_dir) { 1960 case SOPT_SET: 1961 switch (sopt->sopt_name) { 1962 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1963 case TCP_MD5SIG: 1964 if (!TCPMD5_ENABLED()) { 1965 INP_WUNLOCK(inp); 1966 return (ENOPROTOOPT); 1967 } 1968 error = TCPMD5_PCBCTL(inp, sopt); 1969 if (error) 1970 return (error); 1971 goto unlock_and_done; 1972 #endif /* IPSEC */ 1973 1974 case TCP_NODELAY: 1975 case TCP_NOOPT: 1976 INP_WUNLOCK(inp); 1977 error = sooptcopyin(sopt, &optval, sizeof optval, 1978 sizeof optval); 1979 if (error) 1980 return (error); 1981 1982 INP_WLOCK_RECHECK(inp); 1983 switch (sopt->sopt_name) { 1984 case TCP_NODELAY: 1985 opt = TF_NODELAY; 1986 break; 1987 case TCP_NOOPT: 1988 opt = TF_NOOPT; 1989 break; 1990 default: 1991 opt = 0; /* dead code to fool gcc */ 1992 break; 1993 } 1994 1995 if (optval) 1996 tp->t_flags |= opt; 1997 else 1998 tp->t_flags &= ~opt; 1999 unlock_and_done: 2000 #ifdef TCP_OFFLOAD 2001 if (tp->t_flags & TF_TOE) { 2002 tcp_offload_ctloutput(tp, sopt->sopt_dir, 2003 sopt->sopt_name); 2004 } 2005 #endif 2006 INP_WUNLOCK(inp); 2007 break; 2008 2009 case TCP_NOPUSH: 2010 INP_WUNLOCK(inp); 2011 error = sooptcopyin(sopt, &optval, sizeof optval, 2012 sizeof optval); 2013 if (error) 2014 return (error); 2015 2016 INP_WLOCK_RECHECK(inp); 2017 if (optval) 2018 tp->t_flags |= TF_NOPUSH; 2019 else if (tp->t_flags & TF_NOPUSH) { 2020 tp->t_flags &= ~TF_NOPUSH; 2021 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 2022 struct epoch_tracker et; 2023 2024 NET_EPOCH_ENTER(et); 2025 error = tp->t_fb->tfb_tcp_output(tp); 2026 NET_EPOCH_EXIT(et); 2027 } 2028 } 2029 goto unlock_and_done; 2030 2031 case TCP_MAXSEG: 2032 INP_WUNLOCK(inp); 2033 error = sooptcopyin(sopt, &optval, sizeof optval, 2034 sizeof optval); 2035 if (error) 2036 return (error); 2037 2038 INP_WLOCK_RECHECK(inp); 2039 if (optval > 0 && optval <= tp->t_maxseg && 2040 optval + 40 >= V_tcp_minmss) 2041 tp->t_maxseg = optval; 2042 else 2043 error = EINVAL; 2044 goto unlock_and_done; 2045 2046 case TCP_INFO: 2047 INP_WUNLOCK(inp); 2048 error = EINVAL; 2049 break; 2050 2051 case TCP_STATS: 2052 INP_WUNLOCK(inp); 2053 #ifdef STATS 2054 error = sooptcopyin(sopt, &optval, sizeof optval, 2055 sizeof optval); 2056 if (error) 2057 return (error); 2058 2059 if (optval > 0) 2060 sbp = stats_blob_alloc( 2061 V_tcp_perconn_stats_dflt_tpl, 0); 2062 else 2063 sbp = NULL; 2064 2065 INP_WLOCK_RECHECK(inp); 2066 if ((tp->t_stats != NULL && sbp == NULL) || 2067 (tp->t_stats == NULL && sbp != NULL)) { 2068 struct statsblob *t = tp->t_stats; 2069 tp->t_stats = sbp; 2070 sbp = t; 2071 } 2072 INP_WUNLOCK(inp); 2073 2074 stats_blob_destroy(sbp); 2075 #else 2076 return (EOPNOTSUPP); 2077 #endif /* !STATS */ 2078 break; 2079 2080 case TCP_CONGESTION: 2081 INP_WUNLOCK(inp); 2082 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 2083 if (error) 2084 break; 2085 buf[sopt->sopt_valsize] = '\0'; 2086 INP_WLOCK_RECHECK(inp); 2087 CC_LIST_RLOCK(); 2088 STAILQ_FOREACH(algo, &cc_list, entries) 2089 if (strncmp(buf, algo->name, 2090 TCP_CA_NAME_MAX) == 0) 2091 break; 2092 CC_LIST_RUNLOCK(); 2093 if (algo == NULL) { 2094 INP_WUNLOCK(inp); 2095 error = EINVAL; 2096 break; 2097 } 2098 /* 2099 * We hold a write lock over the tcb so it's safe to 2100 * do these things without ordering concerns. 2101 */ 2102 if (CC_ALGO(tp)->cb_destroy != NULL) 2103 CC_ALGO(tp)->cb_destroy(tp->ccv); 2104 CC_DATA(tp) = NULL; 2105 CC_ALGO(tp) = algo; 2106 /* 2107 * If something goes pear shaped initialising the new 2108 * algo, fall back to newreno (which does not 2109 * require initialisation). 2110 */ 2111 if (algo->cb_init != NULL && 2112 algo->cb_init(tp->ccv) != 0) { 2113 CC_ALGO(tp) = &newreno_cc_algo; 2114 /* 2115 * The only reason init should fail is 2116 * because of malloc. 2117 */ 2118 error = ENOMEM; 2119 } 2120 INP_WUNLOCK(inp); 2121 break; 2122 2123 #ifdef KERN_TLS 2124 case TCP_TXTLS_ENABLE: 2125 INP_WUNLOCK(inp); 2126 error = copyin_tls_enable(sopt, &tls); 2127 if (error) 2128 break; 2129 error = ktls_enable_tx(so, &tls); 2130 break; 2131 case TCP_TXTLS_MODE: 2132 INP_WUNLOCK(inp); 2133 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2134 if (error) 2135 return (error); 2136 2137 INP_WLOCK_RECHECK(inp); 2138 error = ktls_set_tx_mode(so, ui); 2139 INP_WUNLOCK(inp); 2140 break; 2141 case TCP_RXTLS_ENABLE: 2142 INP_WUNLOCK(inp); 2143 error = sooptcopyin(sopt, &tls, sizeof(tls), 2144 sizeof(tls)); 2145 if (error) 2146 break; 2147 error = ktls_enable_rx(so, &tls); 2148 break; 2149 #endif 2150 2151 case TCP_KEEPIDLE: 2152 case TCP_KEEPINTVL: 2153 case TCP_KEEPINIT: 2154 INP_WUNLOCK(inp); 2155 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2156 if (error) 2157 return (error); 2158 2159 if (ui > (UINT_MAX / hz)) { 2160 error = EINVAL; 2161 break; 2162 } 2163 ui *= hz; 2164 2165 INP_WLOCK_RECHECK(inp); 2166 switch (sopt->sopt_name) { 2167 case TCP_KEEPIDLE: 2168 tp->t_keepidle = ui; 2169 /* 2170 * XXX: better check current remaining 2171 * timeout and "merge" it with new value. 2172 */ 2173 if ((tp->t_state > TCPS_LISTEN) && 2174 (tp->t_state <= TCPS_CLOSING)) 2175 tcp_timer_activate(tp, TT_KEEP, 2176 TP_KEEPIDLE(tp)); 2177 break; 2178 case TCP_KEEPINTVL: 2179 tp->t_keepintvl = ui; 2180 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2181 (TP_MAXIDLE(tp) > 0)) 2182 tcp_timer_activate(tp, TT_2MSL, 2183 TP_MAXIDLE(tp)); 2184 break; 2185 case TCP_KEEPINIT: 2186 tp->t_keepinit = ui; 2187 if (tp->t_state == TCPS_SYN_RECEIVED || 2188 tp->t_state == TCPS_SYN_SENT) 2189 tcp_timer_activate(tp, TT_KEEP, 2190 TP_KEEPINIT(tp)); 2191 break; 2192 } 2193 goto unlock_and_done; 2194 2195 case TCP_KEEPCNT: 2196 INP_WUNLOCK(inp); 2197 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2198 if (error) 2199 return (error); 2200 2201 INP_WLOCK_RECHECK(inp); 2202 tp->t_keepcnt = ui; 2203 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2204 (TP_MAXIDLE(tp) > 0)) 2205 tcp_timer_activate(tp, TT_2MSL, 2206 TP_MAXIDLE(tp)); 2207 goto unlock_and_done; 2208 2209 #ifdef TCPPCAP 2210 case TCP_PCAP_OUT: 2211 case TCP_PCAP_IN: 2212 INP_WUNLOCK(inp); 2213 error = sooptcopyin(sopt, &optval, sizeof optval, 2214 sizeof optval); 2215 if (error) 2216 return (error); 2217 2218 INP_WLOCK_RECHECK(inp); 2219 if (optval >= 0) 2220 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 2221 &(tp->t_outpkts) : &(tp->t_inpkts), 2222 optval); 2223 else 2224 error = EINVAL; 2225 goto unlock_and_done; 2226 #endif 2227 2228 case TCP_FASTOPEN: { 2229 struct tcp_fastopen tfo_optval; 2230 2231 INP_WUNLOCK(inp); 2232 if (!V_tcp_fastopen_client_enable && 2233 !V_tcp_fastopen_server_enable) 2234 return (EPERM); 2235 2236 error = sooptcopyin(sopt, &tfo_optval, 2237 sizeof(tfo_optval), sizeof(int)); 2238 if (error) 2239 return (error); 2240 2241 INP_WLOCK_RECHECK(inp); 2242 if (tfo_optval.enable) { 2243 if (tp->t_state == TCPS_LISTEN) { 2244 if (!V_tcp_fastopen_server_enable) { 2245 error = EPERM; 2246 goto unlock_and_done; 2247 } 2248 2249 tp->t_flags |= TF_FASTOPEN; 2250 if (tp->t_tfo_pending == NULL) 2251 tp->t_tfo_pending = 2252 tcp_fastopen_alloc_counter(); 2253 } else { 2254 /* 2255 * If a pre-shared key was provided, 2256 * stash it in the client cookie 2257 * field of the tcpcb for use during 2258 * connect. 2259 */ 2260 if (sopt->sopt_valsize == 2261 sizeof(tfo_optval)) { 2262 memcpy(tp->t_tfo_cookie.client, 2263 tfo_optval.psk, 2264 TCP_FASTOPEN_PSK_LEN); 2265 tp->t_tfo_client_cookie_len = 2266 TCP_FASTOPEN_PSK_LEN; 2267 } 2268 tp->t_flags |= TF_FASTOPEN; 2269 } 2270 } else 2271 tp->t_flags &= ~TF_FASTOPEN; 2272 goto unlock_and_done; 2273 } 2274 2275 #ifdef TCP_BLACKBOX 2276 case TCP_LOG: 2277 INP_WUNLOCK(inp); 2278 error = sooptcopyin(sopt, &optval, sizeof optval, 2279 sizeof optval); 2280 if (error) 2281 return (error); 2282 2283 INP_WLOCK_RECHECK(inp); 2284 error = tcp_log_state_change(tp, optval); 2285 goto unlock_and_done; 2286 2287 case TCP_LOGBUF: 2288 INP_WUNLOCK(inp); 2289 error = EINVAL; 2290 break; 2291 2292 case TCP_LOGID: 2293 INP_WUNLOCK(inp); 2294 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2295 if (error) 2296 break; 2297 buf[sopt->sopt_valsize] = '\0'; 2298 INP_WLOCK_RECHECK(inp); 2299 error = tcp_log_set_id(tp, buf); 2300 /* tcp_log_set_id() unlocks the INP. */ 2301 break; 2302 2303 case TCP_LOGDUMP: 2304 case TCP_LOGDUMPID: 2305 INP_WUNLOCK(inp); 2306 error = 2307 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2308 if (error) 2309 break; 2310 buf[sopt->sopt_valsize] = '\0'; 2311 INP_WLOCK_RECHECK(inp); 2312 if (sopt->sopt_name == TCP_LOGDUMP) { 2313 error = tcp_log_dump_tp_logbuf(tp, buf, 2314 M_WAITOK, true); 2315 INP_WUNLOCK(inp); 2316 } else { 2317 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2318 /* 2319 * tcp_log_dump_tp_bucket_logbufs() drops the 2320 * INP lock. 2321 */ 2322 } 2323 break; 2324 #endif 2325 2326 default: 2327 INP_WUNLOCK(inp); 2328 error = ENOPROTOOPT; 2329 break; 2330 } 2331 break; 2332 2333 case SOPT_GET: 2334 tp = intotcpcb(inp); 2335 switch (sopt->sopt_name) { 2336 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2337 case TCP_MD5SIG: 2338 if (!TCPMD5_ENABLED()) { 2339 INP_WUNLOCK(inp); 2340 return (ENOPROTOOPT); 2341 } 2342 error = TCPMD5_PCBCTL(inp, sopt); 2343 break; 2344 #endif 2345 2346 case TCP_NODELAY: 2347 optval = tp->t_flags & TF_NODELAY; 2348 INP_WUNLOCK(inp); 2349 error = sooptcopyout(sopt, &optval, sizeof optval); 2350 break; 2351 case TCP_MAXSEG: 2352 optval = tp->t_maxseg; 2353 INP_WUNLOCK(inp); 2354 error = sooptcopyout(sopt, &optval, sizeof optval); 2355 break; 2356 case TCP_NOOPT: 2357 optval = tp->t_flags & TF_NOOPT; 2358 INP_WUNLOCK(inp); 2359 error = sooptcopyout(sopt, &optval, sizeof optval); 2360 break; 2361 case TCP_NOPUSH: 2362 optval = tp->t_flags & TF_NOPUSH; 2363 INP_WUNLOCK(inp); 2364 error = sooptcopyout(sopt, &optval, sizeof optval); 2365 break; 2366 case TCP_INFO: 2367 tcp_fill_info(tp, &ti); 2368 INP_WUNLOCK(inp); 2369 error = sooptcopyout(sopt, &ti, sizeof ti); 2370 break; 2371 case TCP_STATS: 2372 { 2373 #ifdef STATS 2374 int nheld; 2375 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2376 2377 error = 0; 2378 socklen_t outsbsz = sopt->sopt_valsize; 2379 if (tp->t_stats == NULL) 2380 error = ENOENT; 2381 else if (outsbsz >= tp->t_stats->cursz) 2382 outsbsz = tp->t_stats->cursz; 2383 else if (outsbsz >= sizeof(struct statsblob)) 2384 outsbsz = sizeof(struct statsblob); 2385 else 2386 error = EINVAL; 2387 INP_WUNLOCK(inp); 2388 if (error) 2389 break; 2390 2391 sbp = sopt->sopt_val; 2392 nheld = atop(round_page(((vm_offset_t)sbp) + 2393 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2394 vm_page_t ma[nheld]; 2395 if (vm_fault_quick_hold_pages( 2396 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2397 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2398 nheld) < 0) { 2399 error = EFAULT; 2400 break; 2401 } 2402 2403 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2404 SIZEOF_MEMBER(struct statsblob, flags)))) 2405 goto unhold; 2406 2407 INP_WLOCK_RECHECK(inp); 2408 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2409 sbflags | SB_CLONE_USRDSTNOFAULT); 2410 INP_WUNLOCK(inp); 2411 sopt->sopt_valsize = outsbsz; 2412 unhold: 2413 vm_page_unhold_pages(ma, nheld); 2414 #else 2415 INP_WUNLOCK(inp); 2416 error = EOPNOTSUPP; 2417 #endif /* !STATS */ 2418 break; 2419 } 2420 case TCP_CONGESTION: 2421 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2422 INP_WUNLOCK(inp); 2423 error = sooptcopyout(sopt, buf, len + 1); 2424 break; 2425 case TCP_KEEPIDLE: 2426 case TCP_KEEPINTVL: 2427 case TCP_KEEPINIT: 2428 case TCP_KEEPCNT: 2429 switch (sopt->sopt_name) { 2430 case TCP_KEEPIDLE: 2431 ui = TP_KEEPIDLE(tp) / hz; 2432 break; 2433 case TCP_KEEPINTVL: 2434 ui = TP_KEEPINTVL(tp) / hz; 2435 break; 2436 case TCP_KEEPINIT: 2437 ui = TP_KEEPINIT(tp) / hz; 2438 break; 2439 case TCP_KEEPCNT: 2440 ui = TP_KEEPCNT(tp); 2441 break; 2442 } 2443 INP_WUNLOCK(inp); 2444 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2445 break; 2446 #ifdef TCPPCAP 2447 case TCP_PCAP_OUT: 2448 case TCP_PCAP_IN: 2449 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2450 &(tp->t_outpkts) : &(tp->t_inpkts)); 2451 INP_WUNLOCK(inp); 2452 error = sooptcopyout(sopt, &optval, sizeof optval); 2453 break; 2454 #endif 2455 case TCP_FASTOPEN: 2456 optval = tp->t_flags & TF_FASTOPEN; 2457 INP_WUNLOCK(inp); 2458 error = sooptcopyout(sopt, &optval, sizeof optval); 2459 break; 2460 #ifdef TCP_BLACKBOX 2461 case TCP_LOG: 2462 optval = tp->t_logstate; 2463 INP_WUNLOCK(inp); 2464 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2465 break; 2466 case TCP_LOGBUF: 2467 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2468 error = tcp_log_getlogbuf(sopt, tp); 2469 break; 2470 case TCP_LOGID: 2471 len = tcp_log_get_id(tp, buf); 2472 INP_WUNLOCK(inp); 2473 error = sooptcopyout(sopt, buf, len + 1); 2474 break; 2475 case TCP_LOGDUMP: 2476 case TCP_LOGDUMPID: 2477 INP_WUNLOCK(inp); 2478 error = EINVAL; 2479 break; 2480 #endif 2481 #ifdef KERN_TLS 2482 case TCP_TXTLS_MODE: 2483 optval = ktls_get_tx_mode(so); 2484 INP_WUNLOCK(inp); 2485 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2486 break; 2487 case TCP_RXTLS_MODE: 2488 optval = ktls_get_rx_mode(so); 2489 INP_WUNLOCK(inp); 2490 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2491 break; 2492 #endif 2493 default: 2494 INP_WUNLOCK(inp); 2495 error = ENOPROTOOPT; 2496 break; 2497 } 2498 break; 2499 } 2500 return (error); 2501 } 2502 #undef INP_WLOCK_RECHECK 2503 #undef INP_WLOCK_RECHECK_CLEANUP 2504 2505 /* 2506 * Initiate (or continue) disconnect. 2507 * If embryonic state, just send reset (once). 2508 * If in ``let data drain'' option and linger null, just drop. 2509 * Otherwise (hard), mark socket disconnecting and drop 2510 * current input data; switch states based on user close, and 2511 * send segment to peer (with FIN). 2512 */ 2513 static void 2514 tcp_disconnect(struct tcpcb *tp) 2515 { 2516 struct inpcb *inp = tp->t_inpcb; 2517 struct socket *so = inp->inp_socket; 2518 2519 NET_EPOCH_ASSERT(); 2520 INP_WLOCK_ASSERT(inp); 2521 2522 /* 2523 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2524 * socket is still open. 2525 */ 2526 if (tp->t_state < TCPS_ESTABLISHED && 2527 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2528 tp = tcp_close(tp); 2529 KASSERT(tp != NULL, 2530 ("tcp_disconnect: tcp_close() returned NULL")); 2531 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2532 tp = tcp_drop(tp, 0); 2533 KASSERT(tp != NULL, 2534 ("tcp_disconnect: tcp_drop() returned NULL")); 2535 } else { 2536 soisdisconnecting(so); 2537 sbflush(&so->so_rcv); 2538 tcp_usrclosed(tp); 2539 if (!(inp->inp_flags & INP_DROPPED)) 2540 tp->t_fb->tfb_tcp_output(tp); 2541 } 2542 } 2543 2544 /* 2545 * User issued close, and wish to trail through shutdown states: 2546 * if never received SYN, just forget it. If got a SYN from peer, 2547 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2548 * If already got a FIN from peer, then almost done; go to LAST_ACK 2549 * state. In all other cases, have already sent FIN to peer (e.g. 2550 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2551 * for peer to send FIN or not respond to keep-alives, etc. 2552 * We can let the user exit from the close as soon as the FIN is acked. 2553 */ 2554 static void 2555 tcp_usrclosed(struct tcpcb *tp) 2556 { 2557 2558 NET_EPOCH_ASSERT(); 2559 INP_WLOCK_ASSERT(tp->t_inpcb); 2560 2561 switch (tp->t_state) { 2562 case TCPS_LISTEN: 2563 #ifdef TCP_OFFLOAD 2564 tcp_offload_listen_stop(tp); 2565 #endif 2566 tcp_state_change(tp, TCPS_CLOSED); 2567 /* FALLTHROUGH */ 2568 case TCPS_CLOSED: 2569 tp = tcp_close(tp); 2570 /* 2571 * tcp_close() should never return NULL here as the socket is 2572 * still open. 2573 */ 2574 KASSERT(tp != NULL, 2575 ("tcp_usrclosed: tcp_close() returned NULL")); 2576 break; 2577 2578 case TCPS_SYN_SENT: 2579 case TCPS_SYN_RECEIVED: 2580 tp->t_flags |= TF_NEEDFIN; 2581 break; 2582 2583 case TCPS_ESTABLISHED: 2584 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2585 break; 2586 2587 case TCPS_CLOSE_WAIT: 2588 tcp_state_change(tp, TCPS_LAST_ACK); 2589 break; 2590 } 2591 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2592 soisdisconnected(tp->t_inpcb->inp_socket); 2593 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2594 if (tp->t_state == TCPS_FIN_WAIT_2) { 2595 int timeout; 2596 2597 timeout = (tcp_fast_finwait2_recycle) ? 2598 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2599 tcp_timer_activate(tp, TT_2MSL, timeout); 2600 } 2601 } 2602 } 2603 2604 #ifdef DDB 2605 static void 2606 db_print_indent(int indent) 2607 { 2608 int i; 2609 2610 for (i = 0; i < indent; i++) 2611 db_printf(" "); 2612 } 2613 2614 static void 2615 db_print_tstate(int t_state) 2616 { 2617 2618 switch (t_state) { 2619 case TCPS_CLOSED: 2620 db_printf("TCPS_CLOSED"); 2621 return; 2622 2623 case TCPS_LISTEN: 2624 db_printf("TCPS_LISTEN"); 2625 return; 2626 2627 case TCPS_SYN_SENT: 2628 db_printf("TCPS_SYN_SENT"); 2629 return; 2630 2631 case TCPS_SYN_RECEIVED: 2632 db_printf("TCPS_SYN_RECEIVED"); 2633 return; 2634 2635 case TCPS_ESTABLISHED: 2636 db_printf("TCPS_ESTABLISHED"); 2637 return; 2638 2639 case TCPS_CLOSE_WAIT: 2640 db_printf("TCPS_CLOSE_WAIT"); 2641 return; 2642 2643 case TCPS_FIN_WAIT_1: 2644 db_printf("TCPS_FIN_WAIT_1"); 2645 return; 2646 2647 case TCPS_CLOSING: 2648 db_printf("TCPS_CLOSING"); 2649 return; 2650 2651 case TCPS_LAST_ACK: 2652 db_printf("TCPS_LAST_ACK"); 2653 return; 2654 2655 case TCPS_FIN_WAIT_2: 2656 db_printf("TCPS_FIN_WAIT_2"); 2657 return; 2658 2659 case TCPS_TIME_WAIT: 2660 db_printf("TCPS_TIME_WAIT"); 2661 return; 2662 2663 default: 2664 db_printf("unknown"); 2665 return; 2666 } 2667 } 2668 2669 static void 2670 db_print_tflags(u_int t_flags) 2671 { 2672 int comma; 2673 2674 comma = 0; 2675 if (t_flags & TF_ACKNOW) { 2676 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2677 comma = 1; 2678 } 2679 if (t_flags & TF_DELACK) { 2680 db_printf("%sTF_DELACK", comma ? ", " : ""); 2681 comma = 1; 2682 } 2683 if (t_flags & TF_NODELAY) { 2684 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2685 comma = 1; 2686 } 2687 if (t_flags & TF_NOOPT) { 2688 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2689 comma = 1; 2690 } 2691 if (t_flags & TF_SENTFIN) { 2692 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2693 comma = 1; 2694 } 2695 if (t_flags & TF_REQ_SCALE) { 2696 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2697 comma = 1; 2698 } 2699 if (t_flags & TF_RCVD_SCALE) { 2700 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2701 comma = 1; 2702 } 2703 if (t_flags & TF_REQ_TSTMP) { 2704 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2705 comma = 1; 2706 } 2707 if (t_flags & TF_RCVD_TSTMP) { 2708 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2709 comma = 1; 2710 } 2711 if (t_flags & TF_SACK_PERMIT) { 2712 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2713 comma = 1; 2714 } 2715 if (t_flags & TF_NEEDSYN) { 2716 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2717 comma = 1; 2718 } 2719 if (t_flags & TF_NEEDFIN) { 2720 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2721 comma = 1; 2722 } 2723 if (t_flags & TF_NOPUSH) { 2724 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2725 comma = 1; 2726 } 2727 if (t_flags & TF_MORETOCOME) { 2728 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2729 comma = 1; 2730 } 2731 if (t_flags & TF_LQ_OVERFLOW) { 2732 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2733 comma = 1; 2734 } 2735 if (t_flags & TF_LASTIDLE) { 2736 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2737 comma = 1; 2738 } 2739 if (t_flags & TF_RXWIN0SENT) { 2740 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2741 comma = 1; 2742 } 2743 if (t_flags & TF_FASTRECOVERY) { 2744 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2745 comma = 1; 2746 } 2747 if (t_flags & TF_CONGRECOVERY) { 2748 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2749 comma = 1; 2750 } 2751 if (t_flags & TF_WASFRECOVERY) { 2752 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2753 comma = 1; 2754 } 2755 if (t_flags & TF_SIGNATURE) { 2756 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2757 comma = 1; 2758 } 2759 if (t_flags & TF_FORCEDATA) { 2760 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2761 comma = 1; 2762 } 2763 if (t_flags & TF_TSO) { 2764 db_printf("%sTF_TSO", comma ? ", " : ""); 2765 comma = 1; 2766 } 2767 if (t_flags & TF_FASTOPEN) { 2768 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2769 comma = 1; 2770 } 2771 } 2772 2773 static void 2774 db_print_tflags2(u_int t_flags2) 2775 { 2776 int comma; 2777 2778 comma = 0; 2779 if (t_flags2 & TF2_ECN_PERMIT) { 2780 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : ""); 2781 comma = 1; 2782 } 2783 } 2784 2785 2786 static void 2787 db_print_toobflags(char t_oobflags) 2788 { 2789 int comma; 2790 2791 comma = 0; 2792 if (t_oobflags & TCPOOB_HAVEDATA) { 2793 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2794 comma = 1; 2795 } 2796 if (t_oobflags & TCPOOB_HADDATA) { 2797 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2798 comma = 1; 2799 } 2800 } 2801 2802 static void 2803 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2804 { 2805 2806 db_print_indent(indent); 2807 db_printf("%s at %p\n", name, tp); 2808 2809 indent += 2; 2810 2811 db_print_indent(indent); 2812 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2813 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2814 2815 db_print_indent(indent); 2816 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2817 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2818 2819 db_print_indent(indent); 2820 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2821 &tp->t_timers->tt_delack, tp->t_inpcb); 2822 2823 db_print_indent(indent); 2824 db_printf("t_state: %d (", tp->t_state); 2825 db_print_tstate(tp->t_state); 2826 db_printf(")\n"); 2827 2828 db_print_indent(indent); 2829 db_printf("t_flags: 0x%x (", tp->t_flags); 2830 db_print_tflags(tp->t_flags); 2831 db_printf(")\n"); 2832 2833 db_print_indent(indent); 2834 db_printf("t_flags2: 0x%x (", tp->t_flags2); 2835 db_print_tflags2(tp->t_flags2); 2836 db_printf(")\n"); 2837 2838 db_print_indent(indent); 2839 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2840 tp->snd_una, tp->snd_max, tp->snd_nxt); 2841 2842 db_print_indent(indent); 2843 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2844 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2845 2846 db_print_indent(indent); 2847 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2848 tp->iss, tp->irs, tp->rcv_nxt); 2849 2850 db_print_indent(indent); 2851 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2852 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2853 2854 db_print_indent(indent); 2855 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2856 tp->snd_wnd, tp->snd_cwnd); 2857 2858 db_print_indent(indent); 2859 db_printf("snd_ssthresh: %u snd_recover: " 2860 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2861 2862 db_print_indent(indent); 2863 db_printf("t_rcvtime: %u t_startime: %u\n", 2864 tp->t_rcvtime, tp->t_starttime); 2865 2866 db_print_indent(indent); 2867 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2868 tp->t_rtttime, tp->t_rtseq); 2869 2870 db_print_indent(indent); 2871 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2872 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2873 2874 db_print_indent(indent); 2875 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2876 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2877 tp->t_rttbest); 2878 2879 db_print_indent(indent); 2880 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2881 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2882 2883 db_print_indent(indent); 2884 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2885 db_print_toobflags(tp->t_oobflags); 2886 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2887 2888 db_print_indent(indent); 2889 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2890 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2891 2892 db_print_indent(indent); 2893 db_printf("ts_recent: %u ts_recent_age: %u\n", 2894 tp->ts_recent, tp->ts_recent_age); 2895 2896 db_print_indent(indent); 2897 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2898 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2899 2900 db_print_indent(indent); 2901 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2902 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2903 tp->snd_recover_prev, tp->t_badrxtwin); 2904 2905 db_print_indent(indent); 2906 db_printf("snd_numholes: %d snd_holes first: %p\n", 2907 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2908 2909 db_print_indent(indent); 2910 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n", 2911 tp->snd_fack, tp->rcv_numsacks); 2912 2913 /* Skip sackblks, sackhint. */ 2914 2915 db_print_indent(indent); 2916 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2917 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2918 } 2919 2920 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2921 { 2922 struct tcpcb *tp; 2923 2924 if (!have_addr) { 2925 db_printf("usage: show tcpcb <addr>\n"); 2926 return; 2927 } 2928 tp = (struct tcpcb *)addr; 2929 2930 db_print_tcpcb(tp, "tcpcb", 0); 2931 } 2932 #endif 2933