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 ((sinp->sin_family == AF_INET) && 556 (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST)) 557 return (EACCES); 558 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 559 return (error); 560 561 TCPDEBUG0; 562 inp = sotoinpcb(so); 563 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 564 INP_WLOCK(inp); 565 if (inp->inp_flags & INP_TIMEWAIT) { 566 error = EADDRINUSE; 567 goto out; 568 } 569 if (inp->inp_flags & INP_DROPPED) { 570 error = ECONNREFUSED; 571 goto out; 572 } 573 tp = intotcpcb(inp); 574 TCPDEBUG1(); 575 NET_EPOCH_ENTER(et); 576 if ((error = tcp_connect(tp, nam, td)) != 0) 577 goto out_in_epoch; 578 #ifdef TCP_OFFLOAD 579 if (registered_toedevs > 0 && 580 (so->so_options & SO_NO_OFFLOAD) == 0 && 581 (error = tcp_offload_connect(so, nam)) == 0) 582 goto out_in_epoch; 583 #endif 584 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 585 error = tp->t_fb->tfb_tcp_output(tp); 586 out_in_epoch: 587 NET_EPOCH_EXIT(et); 588 out: 589 TCPDEBUG2(PRU_CONNECT); 590 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 591 INP_WUNLOCK(inp); 592 return (error); 593 } 594 #endif /* INET */ 595 596 #ifdef INET6 597 static int 598 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 599 { 600 struct epoch_tracker et; 601 int error = 0; 602 struct inpcb *inp; 603 struct tcpcb *tp = NULL; 604 struct sockaddr_in6 *sin6; 605 u_int8_t incflagsav; 606 u_char vflagsav; 607 608 TCPDEBUG0; 609 610 sin6 = (struct sockaddr_in6 *)nam; 611 if (nam->sa_len != sizeof (*sin6)) 612 return (EINVAL); 613 /* 614 * Must disallow TCP ``connections'' to multicast addresses. 615 */ 616 if (sin6->sin6_family == AF_INET6 617 && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 618 return (EAFNOSUPPORT); 619 620 inp = sotoinpcb(so); 621 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 622 INP_WLOCK(inp); 623 vflagsav = inp->inp_vflag; 624 incflagsav = inp->inp_inc.inc_flags; 625 if (inp->inp_flags & INP_TIMEWAIT) { 626 error = EADDRINUSE; 627 goto out; 628 } 629 if (inp->inp_flags & INP_DROPPED) { 630 error = ECONNREFUSED; 631 goto out; 632 } 633 tp = intotcpcb(inp); 634 TCPDEBUG1(); 635 #ifdef INET 636 /* 637 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 638 * therefore probably require the hash lock, which isn't held here. 639 * Is this a significant problem? 640 */ 641 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 642 struct sockaddr_in sin; 643 644 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 645 error = EINVAL; 646 goto out; 647 } 648 if ((inp->inp_vflag & INP_IPV4) == 0) { 649 error = EAFNOSUPPORT; 650 goto out; 651 } 652 653 in6_sin6_2_sin(&sin, sin6); 654 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 655 error = EAFNOSUPPORT; 656 goto out; 657 } 658 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) { 659 error = EACCES; 660 goto out; 661 } 662 if ((error = prison_remote_ip4(td->td_ucred, 663 &sin.sin_addr)) != 0) 664 goto out; 665 inp->inp_vflag |= INP_IPV4; 666 inp->inp_vflag &= ~INP_IPV6; 667 NET_EPOCH_ENTER(et); 668 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 669 goto out_in_epoch; 670 #ifdef TCP_OFFLOAD 671 if (registered_toedevs > 0 && 672 (so->so_options & SO_NO_OFFLOAD) == 0 && 673 (error = tcp_offload_connect(so, nam)) == 0) 674 goto out_in_epoch; 675 #endif 676 error = tp->t_fb->tfb_tcp_output(tp); 677 goto out_in_epoch; 678 } else { 679 if ((inp->inp_vflag & INP_IPV6) == 0) { 680 error = EAFNOSUPPORT; 681 goto out; 682 } 683 } 684 #endif 685 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 686 goto out; 687 inp->inp_vflag &= ~INP_IPV4; 688 inp->inp_vflag |= INP_IPV6; 689 inp->inp_inc.inc_flags |= INC_ISIPV6; 690 if ((error = tcp6_connect(tp, nam, td)) != 0) 691 goto out; 692 #ifdef TCP_OFFLOAD 693 if (registered_toedevs > 0 && 694 (so->so_options & SO_NO_OFFLOAD) == 0 && 695 (error = tcp_offload_connect(so, nam)) == 0) 696 goto out; 697 #endif 698 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 699 NET_EPOCH_ENTER(et); 700 error = tp->t_fb->tfb_tcp_output(tp); 701 #ifdef INET 702 out_in_epoch: 703 #endif 704 NET_EPOCH_EXIT(et); 705 out: 706 /* 707 * If the implicit bind in the connect call fails, restore 708 * the flags we modified. 709 */ 710 if (error != 0 && inp->inp_lport == 0) { 711 inp->inp_vflag = vflagsav; 712 inp->inp_inc.inc_flags = incflagsav; 713 } 714 715 TCPDEBUG2(PRU_CONNECT); 716 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 717 INP_WUNLOCK(inp); 718 return (error); 719 } 720 #endif /* INET6 */ 721 722 /* 723 * Initiate disconnect from peer. 724 * If connection never passed embryonic stage, just drop; 725 * else if don't need to let data drain, then can just drop anyways, 726 * else have to begin TCP shutdown process: mark socket disconnecting, 727 * drain unread data, state switch to reflect user close, and 728 * send segment (e.g. FIN) to peer. Socket will be really disconnected 729 * when peer sends FIN and acks ours. 730 * 731 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 732 */ 733 static int 734 tcp_usr_disconnect(struct socket *so) 735 { 736 struct inpcb *inp; 737 struct tcpcb *tp = NULL; 738 struct epoch_tracker et; 739 int error = 0; 740 741 TCPDEBUG0; 742 NET_EPOCH_ENTER(et); 743 inp = sotoinpcb(so); 744 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 745 INP_WLOCK(inp); 746 if (inp->inp_flags & INP_TIMEWAIT) 747 goto out; 748 if (inp->inp_flags & INP_DROPPED) { 749 error = ECONNRESET; 750 goto out; 751 } 752 tp = intotcpcb(inp); 753 TCPDEBUG1(); 754 tcp_disconnect(tp); 755 out: 756 TCPDEBUG2(PRU_DISCONNECT); 757 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 758 INP_WUNLOCK(inp); 759 NET_EPOCH_EXIT(et); 760 return (error); 761 } 762 763 #ifdef INET 764 /* 765 * Accept a connection. Essentially all the work is done at higher levels; 766 * just return the address of the peer, storing through addr. 767 */ 768 static int 769 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 770 { 771 int error = 0; 772 struct inpcb *inp = NULL; 773 struct tcpcb *tp = NULL; 774 struct in_addr addr; 775 in_port_t port = 0; 776 TCPDEBUG0; 777 778 if (so->so_state & SS_ISDISCONNECTED) 779 return (ECONNABORTED); 780 781 inp = sotoinpcb(so); 782 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 783 INP_WLOCK(inp); 784 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 785 error = ECONNABORTED; 786 goto out; 787 } 788 tp = intotcpcb(inp); 789 TCPDEBUG1(); 790 791 /* 792 * We inline in_getpeeraddr and COMMON_END here, so that we can 793 * copy the data of interest and defer the malloc until after we 794 * release the lock. 795 */ 796 port = inp->inp_fport; 797 addr = inp->inp_faddr; 798 799 out: 800 TCPDEBUG2(PRU_ACCEPT); 801 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 802 INP_WUNLOCK(inp); 803 if (error == 0) 804 *nam = in_sockaddr(port, &addr); 805 return error; 806 } 807 #endif /* INET */ 808 809 #ifdef INET6 810 static int 811 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 812 { 813 struct inpcb *inp = NULL; 814 int error = 0; 815 struct tcpcb *tp = NULL; 816 struct in_addr addr; 817 struct in6_addr addr6; 818 struct epoch_tracker et; 819 in_port_t port = 0; 820 int v4 = 0; 821 TCPDEBUG0; 822 823 if (so->so_state & SS_ISDISCONNECTED) 824 return (ECONNABORTED); 825 826 inp = sotoinpcb(so); 827 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 828 NET_EPOCH_ENTER(et); 829 INP_WLOCK(inp); 830 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 831 error = ECONNABORTED; 832 goto out; 833 } 834 tp = intotcpcb(inp); 835 TCPDEBUG1(); 836 837 /* 838 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 839 * copy the data of interest and defer the malloc until after we 840 * release the lock. 841 */ 842 if (inp->inp_vflag & INP_IPV4) { 843 v4 = 1; 844 port = inp->inp_fport; 845 addr = inp->inp_faddr; 846 } else { 847 port = inp->inp_fport; 848 addr6 = inp->in6p_faddr; 849 } 850 851 out: 852 TCPDEBUG2(PRU_ACCEPT); 853 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 854 INP_WUNLOCK(inp); 855 NET_EPOCH_EXIT(et); 856 if (error == 0) { 857 if (v4) 858 *nam = in6_v4mapsin6_sockaddr(port, &addr); 859 else 860 *nam = in6_sockaddr(port, &addr6); 861 } 862 return error; 863 } 864 #endif /* INET6 */ 865 866 /* 867 * Mark the connection as being incapable of further output. 868 */ 869 static int 870 tcp_usr_shutdown(struct socket *so) 871 { 872 int error = 0; 873 struct inpcb *inp; 874 struct tcpcb *tp = NULL; 875 struct epoch_tracker et; 876 877 TCPDEBUG0; 878 NET_EPOCH_ENTER(et); 879 inp = sotoinpcb(so); 880 KASSERT(inp != NULL, ("inp == NULL")); 881 INP_WLOCK(inp); 882 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 883 error = ECONNRESET; 884 goto out; 885 } 886 tp = intotcpcb(inp); 887 TCPDEBUG1(); 888 socantsendmore(so); 889 tcp_usrclosed(tp); 890 if (!(inp->inp_flags & INP_DROPPED)) 891 error = tp->t_fb->tfb_tcp_output(tp); 892 893 out: 894 TCPDEBUG2(PRU_SHUTDOWN); 895 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 896 INP_WUNLOCK(inp); 897 NET_EPOCH_EXIT(et); 898 899 return (error); 900 } 901 902 /* 903 * After a receive, possibly send window update to peer. 904 */ 905 static int 906 tcp_usr_rcvd(struct socket *so, int flags) 907 { 908 struct epoch_tracker et; 909 struct inpcb *inp; 910 struct tcpcb *tp = NULL; 911 int error = 0; 912 913 TCPDEBUG0; 914 inp = sotoinpcb(so); 915 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 916 INP_WLOCK(inp); 917 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 918 error = ECONNRESET; 919 goto out; 920 } 921 tp = intotcpcb(inp); 922 TCPDEBUG1(); 923 /* 924 * For passively-created TFO connections, don't attempt a window 925 * update while still in SYN_RECEIVED as this may trigger an early 926 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 927 * application response data, or failing that, when the DELACK timer 928 * expires. 929 */ 930 if (IS_FASTOPEN(tp->t_flags) && 931 (tp->t_state == TCPS_SYN_RECEIVED)) 932 goto out; 933 NET_EPOCH_ENTER(et); 934 #ifdef TCP_OFFLOAD 935 if (tp->t_flags & TF_TOE) 936 tcp_offload_rcvd(tp); 937 else 938 #endif 939 tp->t_fb->tfb_tcp_output(tp); 940 NET_EPOCH_EXIT(et); 941 out: 942 TCPDEBUG2(PRU_RCVD); 943 TCP_PROBE2(debug__user, tp, PRU_RCVD); 944 INP_WUNLOCK(inp); 945 return (error); 946 } 947 948 /* 949 * Do a send by putting data in output queue and updating urgent 950 * marker if URG set. Possibly send more data. Unlike the other 951 * pru_*() routines, the mbuf chains are our responsibility. We 952 * must either enqueue them or free them. The other pru_* routines 953 * generally are caller-frees. 954 */ 955 static int 956 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 957 struct sockaddr *nam, struct mbuf *control, struct thread *td) 958 { 959 struct epoch_tracker et; 960 int error = 0; 961 struct inpcb *inp; 962 struct tcpcb *tp = NULL; 963 #ifdef INET 964 #ifdef INET6 965 struct sockaddr_in sin; 966 #endif 967 struct sockaddr_in *sinp; 968 #endif 969 #ifdef INET6 970 int isipv6; 971 #endif 972 u_int8_t incflagsav; 973 u_char vflagsav; 974 bool restoreflags; 975 TCPDEBUG0; 976 977 /* 978 * We require the pcbinfo "read lock" if we will close the socket 979 * as part of this call. 980 */ 981 NET_EPOCH_ENTER(et); 982 inp = sotoinpcb(so); 983 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 984 INP_WLOCK(inp); 985 vflagsav = inp->inp_vflag; 986 incflagsav = inp->inp_inc.inc_flags; 987 restoreflags = false; 988 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 989 if (control) 990 m_freem(control); 991 /* 992 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 993 * for freeing memory. 994 */ 995 if (m && (flags & PRUS_NOTREADY) == 0) 996 m_freem(m); 997 error = ECONNRESET; 998 goto out; 999 } 1000 tp = intotcpcb(inp); 1001 if (flags & PRUS_OOB) { 1002 if ((error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) { 1003 if (control) 1004 m_freem(control); 1005 if (m && (flags & PRUS_NOTREADY) == 0) 1006 m_freem(m); 1007 goto out; 1008 } 1009 } 1010 TCPDEBUG1(); 1011 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 1012 switch (nam->sa_family) { 1013 #ifdef INET 1014 case AF_INET: 1015 sinp = (struct sockaddr_in *)nam; 1016 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 1017 if (m) 1018 m_freem(m); 1019 error = EINVAL; 1020 goto out; 1021 } 1022 if ((inp->inp_vflag & INP_IPV6) != 0) { 1023 if (m) 1024 m_freem(m); 1025 error = EAFNOSUPPORT; 1026 goto out; 1027 } 1028 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 1029 if (m) 1030 m_freem(m); 1031 error = EAFNOSUPPORT; 1032 goto out; 1033 } 1034 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) { 1035 if (m) 1036 m_freem(m); 1037 error = EACCES; 1038 goto out; 1039 } 1040 if ((error = prison_remote_ip4(td->td_ucred, 1041 &sinp->sin_addr))) { 1042 if (m) 1043 m_freem(m); 1044 goto out; 1045 } 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 if (m) 1059 m_freem(m); 1060 error = EINVAL; 1061 goto out; 1062 } 1063 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) { 1064 if (m != NULL) 1065 m_freem(m); 1066 error = EAFNOSUPPORT; 1067 goto out; 1068 } 1069 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1070 if (m) 1071 m_freem(m); 1072 error = EAFNOSUPPORT; 1073 goto out; 1074 } 1075 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1076 #ifdef INET 1077 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1078 error = EINVAL; 1079 if (m) 1080 m_freem(m); 1081 goto out; 1082 } 1083 if ((inp->inp_vflag & INP_IPV4) == 0) { 1084 error = EAFNOSUPPORT; 1085 if (m) 1086 m_freem(m); 1087 goto out; 1088 } 1089 restoreflags = true; 1090 inp->inp_vflag &= ~INP_IPV6; 1091 sinp = &sin; 1092 in6_sin6_2_sin(sinp, sin6); 1093 if (IN_MULTICAST( 1094 ntohl(sinp->sin_addr.s_addr))) { 1095 error = EAFNOSUPPORT; 1096 if (m) 1097 m_freem(m); 1098 goto out; 1099 } 1100 if ((error = prison_remote_ip4(td->td_ucred, 1101 &sinp->sin_addr))) { 1102 if (m) 1103 m_freem(m); 1104 goto out; 1105 } 1106 isipv6 = 0; 1107 #else /* !INET */ 1108 error = EAFNOSUPPORT; 1109 if (m) 1110 m_freem(m); 1111 goto out; 1112 #endif /* INET */ 1113 } else { 1114 if ((inp->inp_vflag & INP_IPV6) == 0) { 1115 if (m) 1116 m_freem(m); 1117 error = EAFNOSUPPORT; 1118 goto out; 1119 } 1120 restoreflags = true; 1121 inp->inp_vflag &= ~INP_IPV4; 1122 inp->inp_inc.inc_flags |= INC_ISIPV6; 1123 if ((error = prison_remote_ip6(td->td_ucred, 1124 &sin6->sin6_addr))) { 1125 if (m) 1126 m_freem(m); 1127 goto out; 1128 } 1129 isipv6 = 1; 1130 } 1131 break; 1132 } 1133 #endif /* INET6 */ 1134 default: 1135 if (m) 1136 m_freem(m); 1137 error = EAFNOSUPPORT; 1138 goto out; 1139 } 1140 } 1141 if (control) { 1142 /* TCP doesn't do control messages (rights, creds, etc) */ 1143 if (control->m_len) { 1144 m_freem(control); 1145 if (m) 1146 m_freem(m); 1147 error = EINVAL; 1148 goto out; 1149 } 1150 m_freem(control); /* empty control, just free it */ 1151 } 1152 if (!(flags & PRUS_OOB)) { 1153 sbappendstream(&so->so_snd, m, flags); 1154 if (nam && tp->t_state < TCPS_SYN_SENT) { 1155 /* 1156 * Do implied connect if not yet connected, 1157 * initialize window to default value, and 1158 * initialize maxseg using peer's cached MSS. 1159 */ 1160 #ifdef INET6 1161 if (isipv6) 1162 error = tcp6_connect(tp, nam, td); 1163 #endif /* INET6 */ 1164 #if defined(INET6) && defined(INET) 1165 else 1166 #endif 1167 #ifdef INET 1168 error = tcp_connect(tp, 1169 (struct sockaddr *)sinp, td); 1170 #endif 1171 /* 1172 * The bind operation in tcp_connect succeeded. We 1173 * no longer want to restore the flags if later 1174 * operations fail. 1175 */ 1176 if (error == 0 || inp->inp_lport != 0) 1177 restoreflags = false; 1178 1179 if (error) 1180 goto out; 1181 if (IS_FASTOPEN(tp->t_flags)) 1182 tcp_fastopen_connect(tp); 1183 else { 1184 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1185 tcp_mss(tp, -1); 1186 } 1187 } 1188 if (flags & PRUS_EOF) { 1189 /* 1190 * Close the send side of the connection after 1191 * the data is sent. 1192 */ 1193 socantsendmore(so); 1194 tcp_usrclosed(tp); 1195 } 1196 if (TCPS_HAVEESTABLISHED(tp->t_state) && 1197 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 1198 (tp->t_fbyte_out == 0) && 1199 (so->so_snd.sb_ccc > 0)) { 1200 tp->t_fbyte_out = ticks; 1201 if (tp->t_fbyte_out == 0) 1202 tp->t_fbyte_out = 1; 1203 if (tp->t_fbyte_out && tp->t_fbyte_in) 1204 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 1205 } 1206 if (!(inp->inp_flags & INP_DROPPED) && 1207 !(flags & PRUS_NOTREADY)) { 1208 if (flags & PRUS_MORETOCOME) 1209 tp->t_flags |= TF_MORETOCOME; 1210 error = tp->t_fb->tfb_tcp_output(tp); 1211 if (flags & PRUS_MORETOCOME) 1212 tp->t_flags &= ~TF_MORETOCOME; 1213 } 1214 } else { 1215 /* 1216 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1217 */ 1218 SOCKBUF_LOCK(&so->so_snd); 1219 if (sbspace(&so->so_snd) < -512) { 1220 SOCKBUF_UNLOCK(&so->so_snd); 1221 m_freem(m); 1222 error = ENOBUFS; 1223 goto out; 1224 } 1225 /* 1226 * According to RFC961 (Assigned Protocols), 1227 * the urgent pointer points to the last octet 1228 * of urgent data. We continue, however, 1229 * to consider it to indicate the first octet 1230 * of data past the urgent section. 1231 * Otherwise, snd_up should be one lower. 1232 */ 1233 sbappendstream_locked(&so->so_snd, m, flags); 1234 SOCKBUF_UNLOCK(&so->so_snd); 1235 if (nam && tp->t_state < TCPS_SYN_SENT) { 1236 /* 1237 * Do implied connect if not yet connected, 1238 * initialize window to default value, and 1239 * initialize maxseg using peer's cached MSS. 1240 */ 1241 1242 /* 1243 * Not going to contemplate SYN|URG 1244 */ 1245 if (IS_FASTOPEN(tp->t_flags)) 1246 tp->t_flags &= ~TF_FASTOPEN; 1247 #ifdef INET6 1248 if (isipv6) 1249 error = tcp6_connect(tp, nam, td); 1250 #endif /* INET6 */ 1251 #if defined(INET6) && defined(INET) 1252 else 1253 #endif 1254 #ifdef INET 1255 error = tcp_connect(tp, 1256 (struct sockaddr *)sinp, td); 1257 #endif 1258 /* 1259 * The bind operation in tcp_connect succeeded. We 1260 * no longer want to restore the flags if later 1261 * operations fail. 1262 */ 1263 if (error == 0 || inp->inp_lport != 0) 1264 restoreflags = false; 1265 1266 if (error) 1267 goto out; 1268 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1269 tcp_mss(tp, -1); 1270 } 1271 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1272 if (!(flags & PRUS_NOTREADY)) { 1273 tp->t_flags |= TF_FORCEDATA; 1274 error = tp->t_fb->tfb_tcp_output(tp); 1275 tp->t_flags &= ~TF_FORCEDATA; 1276 } 1277 } 1278 TCP_LOG_EVENT(tp, NULL, 1279 &inp->inp_socket->so_rcv, 1280 &inp->inp_socket->so_snd, 1281 TCP_LOG_USERSEND, error, 1282 0, NULL, false); 1283 out: 1284 /* 1285 * If the request was unsuccessful and we changed flags, 1286 * restore the original flags. 1287 */ 1288 if (error != 0 && restoreflags) { 1289 inp->inp_vflag = vflagsav; 1290 inp->inp_inc.inc_flags = incflagsav; 1291 } 1292 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1293 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1294 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1295 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1296 INP_WUNLOCK(inp); 1297 NET_EPOCH_EXIT(et); 1298 return (error); 1299 } 1300 1301 static int 1302 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1303 { 1304 struct epoch_tracker et; 1305 struct inpcb *inp; 1306 struct tcpcb *tp; 1307 int error; 1308 1309 inp = sotoinpcb(so); 1310 INP_WLOCK(inp); 1311 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1312 INP_WUNLOCK(inp); 1313 mb_free_notready(m, count); 1314 return (ECONNRESET); 1315 } 1316 tp = intotcpcb(inp); 1317 1318 SOCKBUF_LOCK(&so->so_snd); 1319 error = sbready(&so->so_snd, m, count); 1320 SOCKBUF_UNLOCK(&so->so_snd); 1321 if (error == 0) { 1322 NET_EPOCH_ENTER(et); 1323 error = tp->t_fb->tfb_tcp_output(tp); 1324 NET_EPOCH_EXIT(et); 1325 } 1326 INP_WUNLOCK(inp); 1327 1328 return (error); 1329 } 1330 1331 /* 1332 * Abort the TCP. Drop the connection abruptly. 1333 */ 1334 static void 1335 tcp_usr_abort(struct socket *so) 1336 { 1337 struct inpcb *inp; 1338 struct tcpcb *tp = NULL; 1339 struct epoch_tracker et; 1340 TCPDEBUG0; 1341 1342 inp = sotoinpcb(so); 1343 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1344 1345 NET_EPOCH_ENTER(et); 1346 INP_WLOCK(inp); 1347 KASSERT(inp->inp_socket != NULL, 1348 ("tcp_usr_abort: inp_socket == NULL")); 1349 1350 /* 1351 * If we still have full TCP state, and we're not dropped, drop. 1352 */ 1353 if (!(inp->inp_flags & INP_TIMEWAIT) && 1354 !(inp->inp_flags & INP_DROPPED)) { 1355 tp = intotcpcb(inp); 1356 TCPDEBUG1(); 1357 tp = tcp_drop(tp, ECONNABORTED); 1358 if (tp == NULL) 1359 goto dropped; 1360 TCPDEBUG2(PRU_ABORT); 1361 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1362 } 1363 if (!(inp->inp_flags & INP_DROPPED)) { 1364 SOCK_LOCK(so); 1365 so->so_state |= SS_PROTOREF; 1366 SOCK_UNLOCK(so); 1367 inp->inp_flags |= INP_SOCKREF; 1368 } 1369 INP_WUNLOCK(inp); 1370 dropped: 1371 NET_EPOCH_EXIT(et); 1372 } 1373 1374 /* 1375 * TCP socket is closed. Start friendly disconnect. 1376 */ 1377 static void 1378 tcp_usr_close(struct socket *so) 1379 { 1380 struct inpcb *inp; 1381 struct tcpcb *tp = NULL; 1382 struct epoch_tracker et; 1383 TCPDEBUG0; 1384 1385 inp = sotoinpcb(so); 1386 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1387 1388 NET_EPOCH_ENTER(et); 1389 INP_WLOCK(inp); 1390 KASSERT(inp->inp_socket != NULL, 1391 ("tcp_usr_close: inp_socket == NULL")); 1392 1393 /* 1394 * If we still have full TCP state, and we're not dropped, initiate 1395 * a disconnect. 1396 */ 1397 if (!(inp->inp_flags & INP_TIMEWAIT) && 1398 !(inp->inp_flags & INP_DROPPED)) { 1399 tp = intotcpcb(inp); 1400 TCPDEBUG1(); 1401 tcp_disconnect(tp); 1402 TCPDEBUG2(PRU_CLOSE); 1403 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1404 } 1405 if (!(inp->inp_flags & INP_DROPPED)) { 1406 SOCK_LOCK(so); 1407 so->so_state |= SS_PROTOREF; 1408 SOCK_UNLOCK(so); 1409 inp->inp_flags |= INP_SOCKREF; 1410 } 1411 INP_WUNLOCK(inp); 1412 NET_EPOCH_EXIT(et); 1413 } 1414 1415 static int 1416 tcp_pru_options_support(struct tcpcb *tp, int flags) 1417 { 1418 /* 1419 * If the specific TCP stack has a pru_options 1420 * specified then it does not always support 1421 * all the PRU_XX options and we must ask it. 1422 * If the function is not specified then all 1423 * of the PRU_XX options are supported. 1424 */ 1425 int ret = 0; 1426 1427 if (tp->t_fb->tfb_pru_options) { 1428 ret = (*tp->t_fb->tfb_pru_options)(tp, flags); 1429 } 1430 return (ret); 1431 } 1432 1433 /* 1434 * Receive out-of-band data. 1435 */ 1436 static int 1437 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1438 { 1439 int error = 0; 1440 struct inpcb *inp; 1441 struct tcpcb *tp = NULL; 1442 1443 TCPDEBUG0; 1444 inp = sotoinpcb(so); 1445 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1446 INP_WLOCK(inp); 1447 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1448 error = ECONNRESET; 1449 goto out; 1450 } 1451 tp = intotcpcb(inp); 1452 error = tcp_pru_options_support(tp, PRUS_OOB); 1453 if (error) { 1454 goto out; 1455 } 1456 TCPDEBUG1(); 1457 if ((so->so_oobmark == 0 && 1458 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1459 so->so_options & SO_OOBINLINE || 1460 tp->t_oobflags & TCPOOB_HADDATA) { 1461 error = EINVAL; 1462 goto out; 1463 } 1464 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1465 error = EWOULDBLOCK; 1466 goto out; 1467 } 1468 m->m_len = 1; 1469 *mtod(m, caddr_t) = tp->t_iobc; 1470 if ((flags & MSG_PEEK) == 0) 1471 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1472 1473 out: 1474 TCPDEBUG2(PRU_RCVOOB); 1475 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1476 INP_WUNLOCK(inp); 1477 return (error); 1478 } 1479 1480 #ifdef INET 1481 struct pr_usrreqs tcp_usrreqs = { 1482 .pru_abort = tcp_usr_abort, 1483 .pru_accept = tcp_usr_accept, 1484 .pru_attach = tcp_usr_attach, 1485 .pru_bind = tcp_usr_bind, 1486 .pru_connect = tcp_usr_connect, 1487 .pru_control = in_control, 1488 .pru_detach = tcp_usr_detach, 1489 .pru_disconnect = tcp_usr_disconnect, 1490 .pru_listen = tcp_usr_listen, 1491 .pru_peeraddr = in_getpeeraddr, 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 = in_getsockaddr, 1498 .pru_sosetlabel = in_pcbsosetlabel, 1499 .pru_close = tcp_usr_close, 1500 }; 1501 #endif /* INET */ 1502 1503 #ifdef INET6 1504 struct pr_usrreqs tcp6_usrreqs = { 1505 .pru_abort = tcp_usr_abort, 1506 .pru_accept = tcp6_usr_accept, 1507 .pru_attach = tcp_usr_attach, 1508 .pru_bind = tcp6_usr_bind, 1509 .pru_connect = tcp6_usr_connect, 1510 .pru_control = in6_control, 1511 .pru_detach = tcp_usr_detach, 1512 .pru_disconnect = tcp_usr_disconnect, 1513 .pru_listen = tcp6_usr_listen, 1514 .pru_peeraddr = in6_mapped_peeraddr, 1515 .pru_rcvd = tcp_usr_rcvd, 1516 .pru_rcvoob = tcp_usr_rcvoob, 1517 .pru_send = tcp_usr_send, 1518 .pru_ready = tcp_usr_ready, 1519 .pru_shutdown = tcp_usr_shutdown, 1520 .pru_sockaddr = in6_mapped_sockaddr, 1521 .pru_sosetlabel = in_pcbsosetlabel, 1522 .pru_close = tcp_usr_close, 1523 }; 1524 #endif /* INET6 */ 1525 1526 #ifdef INET 1527 /* 1528 * Common subroutine to open a TCP connection to remote host specified 1529 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1530 * port number if needed. Call in_pcbconnect_setup to do the routing and 1531 * to choose a local host address (interface). If there is an existing 1532 * incarnation of the same connection in TIME-WAIT state and if the remote 1533 * host was sending CC options and if the connection duration was < MSL, then 1534 * truncate the previous TIME-WAIT state and proceed. 1535 * Initialize connection parameters and enter SYN-SENT state. 1536 */ 1537 static int 1538 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1539 { 1540 struct inpcb *inp = tp->t_inpcb, *oinp; 1541 struct socket *so = inp->inp_socket; 1542 struct in_addr laddr; 1543 u_short lport; 1544 int error; 1545 1546 NET_EPOCH_ASSERT(); 1547 INP_WLOCK_ASSERT(inp); 1548 INP_HASH_WLOCK(&V_tcbinfo); 1549 1550 if (V_tcp_require_unique_port && inp->inp_lport == 0) { 1551 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1552 if (error) 1553 goto out; 1554 } 1555 1556 /* 1557 * Cannot simply call in_pcbconnect, because there might be an 1558 * earlier incarnation of this same connection still in 1559 * TIME_WAIT state, creating an ADDRINUSE error. 1560 */ 1561 laddr = inp->inp_laddr; 1562 lport = inp->inp_lport; 1563 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1564 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1565 if (error && oinp == NULL) 1566 goto out; 1567 if (oinp) { 1568 error = EADDRINUSE; 1569 goto out; 1570 } 1571 /* Handle initial bind if it hadn't been done in advance. */ 1572 if (inp->inp_lport == 0) { 1573 inp->inp_lport = lport; 1574 if (in_pcbinshash(inp) != 0) { 1575 inp->inp_lport = 0; 1576 error = EAGAIN; 1577 goto out; 1578 } 1579 } 1580 inp->inp_laddr = laddr; 1581 in_pcbrehash(inp); 1582 INP_HASH_WUNLOCK(&V_tcbinfo); 1583 1584 /* 1585 * Compute window scaling to request: 1586 * Scale to fit into sweet spot. See tcp_syncache.c. 1587 * XXX: This should move to tcp_output(). 1588 */ 1589 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1590 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1591 tp->request_r_scale++; 1592 1593 soisconnecting(so); 1594 TCPSTAT_INC(tcps_connattempt); 1595 tcp_state_change(tp, TCPS_SYN_SENT); 1596 tp->iss = tcp_new_isn(&inp->inp_inc); 1597 if (tp->t_flags & TF_REQ_TSTMP) 1598 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1599 tcp_sendseqinit(tp); 1600 1601 return 0; 1602 1603 out: 1604 INP_HASH_WUNLOCK(&V_tcbinfo); 1605 return (error); 1606 } 1607 #endif /* INET */ 1608 1609 #ifdef INET6 1610 static int 1611 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1612 { 1613 struct inpcb *inp = tp->t_inpcb; 1614 int error; 1615 1616 INP_WLOCK_ASSERT(inp); 1617 INP_HASH_WLOCK(&V_tcbinfo); 1618 1619 if (V_tcp_require_unique_port && inp->inp_lport == 0) { 1620 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1621 if (error) 1622 goto out; 1623 } 1624 error = in6_pcbconnect(inp, nam, td->td_ucred); 1625 if (error != 0) 1626 goto out; 1627 INP_HASH_WUNLOCK(&V_tcbinfo); 1628 1629 /* Compute window scaling to request. */ 1630 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1631 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1632 tp->request_r_scale++; 1633 1634 soisconnecting(inp->inp_socket); 1635 TCPSTAT_INC(tcps_connattempt); 1636 tcp_state_change(tp, TCPS_SYN_SENT); 1637 tp->iss = tcp_new_isn(&inp->inp_inc); 1638 if (tp->t_flags & TF_REQ_TSTMP) 1639 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1640 tcp_sendseqinit(tp); 1641 1642 return 0; 1643 1644 out: 1645 INP_HASH_WUNLOCK(&V_tcbinfo); 1646 return error; 1647 } 1648 #endif /* INET6 */ 1649 1650 /* 1651 * Export TCP internal state information via a struct tcp_info, based on the 1652 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1653 * (TCP state machine, etc). We export all information using FreeBSD-native 1654 * constants -- for example, the numeric values for tcpi_state will differ 1655 * from Linux. 1656 */ 1657 static void 1658 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1659 { 1660 1661 INP_WLOCK_ASSERT(tp->t_inpcb); 1662 bzero(ti, sizeof(*ti)); 1663 1664 ti->tcpi_state = tp->t_state; 1665 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1666 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1667 if (tp->t_flags & TF_SACK_PERMIT) 1668 ti->tcpi_options |= TCPI_OPT_SACK; 1669 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1670 ti->tcpi_options |= TCPI_OPT_WSCALE; 1671 ti->tcpi_snd_wscale = tp->snd_scale; 1672 ti->tcpi_rcv_wscale = tp->rcv_scale; 1673 } 1674 if (tp->t_flags2 & TF2_ECN_PERMIT) 1675 ti->tcpi_options |= TCPI_OPT_ECN; 1676 1677 ti->tcpi_rto = tp->t_rxtcur * tick; 1678 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1679 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1680 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1681 1682 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1683 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1684 1685 /* 1686 * FreeBSD-specific extension fields for tcp_info. 1687 */ 1688 ti->tcpi_rcv_space = tp->rcv_wnd; 1689 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1690 ti->tcpi_snd_wnd = tp->snd_wnd; 1691 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1692 ti->tcpi_snd_nxt = tp->snd_nxt; 1693 ti->tcpi_snd_mss = tp->t_maxseg; 1694 ti->tcpi_rcv_mss = tp->t_maxseg; 1695 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1696 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1697 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1698 #ifdef TCP_OFFLOAD 1699 if (tp->t_flags & TF_TOE) { 1700 ti->tcpi_options |= TCPI_OPT_TOE; 1701 tcp_offload_tcp_info(tp, ti); 1702 } 1703 #endif 1704 } 1705 1706 /* 1707 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1708 * socket option arguments. When it re-acquires the lock after the copy, it 1709 * has to revalidate that the connection is still valid for the socket 1710 * option. 1711 */ 1712 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1713 INP_WLOCK(inp); \ 1714 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1715 INP_WUNLOCK(inp); \ 1716 cleanup; \ 1717 return (ECONNRESET); \ 1718 } \ 1719 tp = intotcpcb(inp); \ 1720 } while(0) 1721 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1722 1723 int 1724 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1725 { 1726 int error; 1727 struct inpcb *inp; 1728 struct tcpcb *tp; 1729 struct tcp_function_block *blk; 1730 struct tcp_function_set fsn; 1731 1732 error = 0; 1733 inp = sotoinpcb(so); 1734 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1735 if (sopt->sopt_level != IPPROTO_TCP) { 1736 #ifdef INET6 1737 if (inp->inp_vflag & INP_IPV6PROTO) { 1738 error = ip6_ctloutput(so, sopt); 1739 /* 1740 * In case of the IPV6_USE_MIN_MTU socket option, 1741 * the INC_IPV6MINMTU flag to announce a corresponding 1742 * MSS during the initial handshake. 1743 * If the TCP connection is not in the front states, 1744 * just reduce the MSS being used. 1745 * This avoids the sending of TCP segments which will 1746 * be fragmented at the IPv6 layer. 1747 */ 1748 if ((error == 0) && 1749 (sopt->sopt_dir == SOPT_SET) && 1750 (sopt->sopt_level == IPPROTO_IPV6) && 1751 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1752 INP_WLOCK(inp); 1753 if ((inp->inp_flags & 1754 (INP_TIMEWAIT | INP_DROPPED))) { 1755 INP_WUNLOCK(inp); 1756 return (ECONNRESET); 1757 } 1758 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1759 tp = intotcpcb(inp); 1760 if ((tp->t_state >= TCPS_SYN_SENT) && 1761 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1762 struct ip6_pktopts *opt; 1763 1764 opt = inp->in6p_outputopts; 1765 if ((opt != NULL) && 1766 (opt->ip6po_minmtu == 1767 IP6PO_MINMTU_ALL)) { 1768 if (tp->t_maxseg > TCP6_MSS) { 1769 tp->t_maxseg = TCP6_MSS; 1770 } 1771 } 1772 } 1773 INP_WUNLOCK(inp); 1774 } 1775 } 1776 #endif /* INET6 */ 1777 #if defined(INET6) && defined(INET) 1778 else 1779 #endif 1780 #ifdef INET 1781 { 1782 error = ip_ctloutput(so, sopt); 1783 } 1784 #endif 1785 return (error); 1786 } 1787 INP_WLOCK(inp); 1788 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1789 INP_WUNLOCK(inp); 1790 return (ECONNRESET); 1791 } 1792 tp = intotcpcb(inp); 1793 /* 1794 * Protect the TCP option TCP_FUNCTION_BLK so 1795 * that a sub-function can *never* overwrite this. 1796 */ 1797 if ((sopt->sopt_dir == SOPT_SET) && 1798 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1799 INP_WUNLOCK(inp); 1800 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1801 sizeof fsn); 1802 if (error) 1803 return (error); 1804 INP_WLOCK_RECHECK(inp); 1805 blk = find_and_ref_tcp_functions(&fsn); 1806 if (blk == NULL) { 1807 INP_WUNLOCK(inp); 1808 return (ENOENT); 1809 } 1810 if (tp->t_fb == blk) { 1811 /* You already have this */ 1812 refcount_release(&blk->tfb_refcnt); 1813 INP_WUNLOCK(inp); 1814 return (0); 1815 } 1816 if (tp->t_state != TCPS_CLOSED) { 1817 /* 1818 * The user has advanced the state 1819 * past the initial point, we may not 1820 * be able to switch. 1821 */ 1822 if (blk->tfb_tcp_handoff_ok != NULL) { 1823 /* 1824 * Does the stack provide a 1825 * query mechanism, if so it may 1826 * still be possible? 1827 */ 1828 error = (*blk->tfb_tcp_handoff_ok)(tp); 1829 } else 1830 error = EINVAL; 1831 if (error) { 1832 refcount_release(&blk->tfb_refcnt); 1833 INP_WUNLOCK(inp); 1834 return(error); 1835 } 1836 } 1837 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1838 refcount_release(&blk->tfb_refcnt); 1839 INP_WUNLOCK(inp); 1840 return (ENOENT); 1841 } 1842 /* 1843 * Release the old refcnt, the 1844 * lookup acquired a ref on the 1845 * new one already. 1846 */ 1847 if (tp->t_fb->tfb_tcp_fb_fini) { 1848 /* 1849 * Tell the stack to cleanup with 0 i.e. 1850 * the tcb is not going away. 1851 */ 1852 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1853 } 1854 #ifdef TCPHPTS 1855 /* Assure that we are not on any hpts */ 1856 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1857 #endif 1858 if (blk->tfb_tcp_fb_init) { 1859 error = (*blk->tfb_tcp_fb_init)(tp); 1860 if (error) { 1861 refcount_release(&blk->tfb_refcnt); 1862 if (tp->t_fb->tfb_tcp_fb_init) { 1863 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1864 /* Fall back failed, drop the connection */ 1865 INP_WUNLOCK(inp); 1866 soabort(so); 1867 return(error); 1868 } 1869 } 1870 goto err_out; 1871 } 1872 } 1873 refcount_release(&tp->t_fb->tfb_refcnt); 1874 tp->t_fb = blk; 1875 #ifdef TCP_OFFLOAD 1876 if (tp->t_flags & TF_TOE) { 1877 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1878 sopt->sopt_name); 1879 } 1880 #endif 1881 err_out: 1882 INP_WUNLOCK(inp); 1883 return (error); 1884 } else if ((sopt->sopt_dir == SOPT_GET) && 1885 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1886 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1887 TCP_FUNCTION_NAME_LEN_MAX); 1888 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1889 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1890 INP_WUNLOCK(inp); 1891 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1892 return (error); 1893 } 1894 /* Pass in the INP locked, called must unlock it */ 1895 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1896 } 1897 1898 /* 1899 * If this assert becomes untrue, we need to change the size of the buf 1900 * variable in tcp_default_ctloutput(). 1901 */ 1902 #ifdef CTASSERT 1903 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1904 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1905 #endif 1906 1907 #ifdef KERN_TLS 1908 static int 1909 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls) 1910 { 1911 struct tls_enable_v0 tls_v0; 1912 int error; 1913 1914 if (sopt->sopt_valsize == sizeof(tls_v0)) { 1915 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0), 1916 sizeof(tls_v0)); 1917 if (error) 1918 return (error); 1919 memset(tls, 0, sizeof(*tls)); 1920 tls->cipher_key = tls_v0.cipher_key; 1921 tls->iv = tls_v0.iv; 1922 tls->auth_key = tls_v0.auth_key; 1923 tls->cipher_algorithm = tls_v0.cipher_algorithm; 1924 tls->cipher_key_len = tls_v0.cipher_key_len; 1925 tls->iv_len = tls_v0.iv_len; 1926 tls->auth_algorithm = tls_v0.auth_algorithm; 1927 tls->auth_key_len = tls_v0.auth_key_len; 1928 tls->flags = tls_v0.flags; 1929 tls->tls_vmajor = tls_v0.tls_vmajor; 1930 tls->tls_vminor = tls_v0.tls_vminor; 1931 return (0); 1932 } 1933 1934 return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls))); 1935 } 1936 #endif 1937 1938 int 1939 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1940 { 1941 int error, opt, optval; 1942 u_int ui; 1943 struct tcp_info ti; 1944 #ifdef KERN_TLS 1945 struct tls_enable tls; 1946 #endif 1947 struct cc_algo *algo; 1948 char *pbuf, buf[TCP_LOG_ID_LEN]; 1949 #ifdef STATS 1950 struct statsblob *sbp; 1951 #endif 1952 size_t len; 1953 1954 /* 1955 * For TCP_CCALGOOPT forward the control to CC module, for both 1956 * SOPT_SET and SOPT_GET. 1957 */ 1958 switch (sopt->sopt_name) { 1959 case TCP_CCALGOOPT: 1960 INP_WUNLOCK(inp); 1961 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 1962 return (EINVAL); 1963 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1964 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1965 sopt->sopt_valsize); 1966 if (error) { 1967 free(pbuf, M_TEMP); 1968 return (error); 1969 } 1970 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1971 if (CC_ALGO(tp)->ctl_output != NULL) 1972 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1973 else 1974 error = ENOENT; 1975 INP_WUNLOCK(inp); 1976 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1977 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1978 free(pbuf, M_TEMP); 1979 return (error); 1980 } 1981 1982 switch (sopt->sopt_dir) { 1983 case SOPT_SET: 1984 switch (sopt->sopt_name) { 1985 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1986 case TCP_MD5SIG: 1987 if (!TCPMD5_ENABLED()) { 1988 INP_WUNLOCK(inp); 1989 return (ENOPROTOOPT); 1990 } 1991 error = TCPMD5_PCBCTL(inp, sopt); 1992 if (error) 1993 return (error); 1994 goto unlock_and_done; 1995 #endif /* IPSEC */ 1996 1997 case TCP_NODELAY: 1998 case TCP_NOOPT: 1999 INP_WUNLOCK(inp); 2000 error = sooptcopyin(sopt, &optval, sizeof optval, 2001 sizeof optval); 2002 if (error) 2003 return (error); 2004 2005 INP_WLOCK_RECHECK(inp); 2006 switch (sopt->sopt_name) { 2007 case TCP_NODELAY: 2008 opt = TF_NODELAY; 2009 break; 2010 case TCP_NOOPT: 2011 opt = TF_NOOPT; 2012 break; 2013 default: 2014 opt = 0; /* dead code to fool gcc */ 2015 break; 2016 } 2017 2018 if (optval) 2019 tp->t_flags |= opt; 2020 else 2021 tp->t_flags &= ~opt; 2022 unlock_and_done: 2023 #ifdef TCP_OFFLOAD 2024 if (tp->t_flags & TF_TOE) { 2025 tcp_offload_ctloutput(tp, sopt->sopt_dir, 2026 sopt->sopt_name); 2027 } 2028 #endif 2029 INP_WUNLOCK(inp); 2030 break; 2031 2032 case TCP_NOPUSH: 2033 INP_WUNLOCK(inp); 2034 error = sooptcopyin(sopt, &optval, sizeof optval, 2035 sizeof optval); 2036 if (error) 2037 return (error); 2038 2039 INP_WLOCK_RECHECK(inp); 2040 if (optval) 2041 tp->t_flags |= TF_NOPUSH; 2042 else if (tp->t_flags & TF_NOPUSH) { 2043 tp->t_flags &= ~TF_NOPUSH; 2044 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 2045 struct epoch_tracker et; 2046 2047 NET_EPOCH_ENTER(et); 2048 error = tp->t_fb->tfb_tcp_output(tp); 2049 NET_EPOCH_EXIT(et); 2050 } 2051 } 2052 goto unlock_and_done; 2053 2054 case TCP_MAXSEG: 2055 INP_WUNLOCK(inp); 2056 error = sooptcopyin(sopt, &optval, sizeof optval, 2057 sizeof optval); 2058 if (error) 2059 return (error); 2060 2061 INP_WLOCK_RECHECK(inp); 2062 if (optval > 0 && optval <= tp->t_maxseg && 2063 optval + 40 >= V_tcp_minmss) 2064 tp->t_maxseg = optval; 2065 else 2066 error = EINVAL; 2067 goto unlock_and_done; 2068 2069 case TCP_INFO: 2070 INP_WUNLOCK(inp); 2071 error = EINVAL; 2072 break; 2073 2074 case TCP_STATS: 2075 INP_WUNLOCK(inp); 2076 #ifdef STATS 2077 error = sooptcopyin(sopt, &optval, sizeof optval, 2078 sizeof optval); 2079 if (error) 2080 return (error); 2081 2082 if (optval > 0) 2083 sbp = stats_blob_alloc( 2084 V_tcp_perconn_stats_dflt_tpl, 0); 2085 else 2086 sbp = NULL; 2087 2088 INP_WLOCK_RECHECK(inp); 2089 if ((tp->t_stats != NULL && sbp == NULL) || 2090 (tp->t_stats == NULL && sbp != NULL)) { 2091 struct statsblob *t = tp->t_stats; 2092 tp->t_stats = sbp; 2093 sbp = t; 2094 } 2095 INP_WUNLOCK(inp); 2096 2097 stats_blob_destroy(sbp); 2098 #else 2099 return (EOPNOTSUPP); 2100 #endif /* !STATS */ 2101 break; 2102 2103 case TCP_CONGESTION: 2104 INP_WUNLOCK(inp); 2105 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 2106 if (error) 2107 break; 2108 buf[sopt->sopt_valsize] = '\0'; 2109 INP_WLOCK_RECHECK(inp); 2110 CC_LIST_RLOCK(); 2111 STAILQ_FOREACH(algo, &cc_list, entries) 2112 if (strncmp(buf, algo->name, 2113 TCP_CA_NAME_MAX) == 0) 2114 break; 2115 CC_LIST_RUNLOCK(); 2116 if (algo == NULL) { 2117 INP_WUNLOCK(inp); 2118 error = EINVAL; 2119 break; 2120 } 2121 /* 2122 * We hold a write lock over the tcb so it's safe to 2123 * do these things without ordering concerns. 2124 */ 2125 if (CC_ALGO(tp)->cb_destroy != NULL) 2126 CC_ALGO(tp)->cb_destroy(tp->ccv); 2127 CC_DATA(tp) = NULL; 2128 CC_ALGO(tp) = algo; 2129 /* 2130 * If something goes pear shaped initialising the new 2131 * algo, fall back to newreno (which does not 2132 * require initialisation). 2133 */ 2134 if (algo->cb_init != NULL && 2135 algo->cb_init(tp->ccv) != 0) { 2136 CC_ALGO(tp) = &newreno_cc_algo; 2137 /* 2138 * The only reason init should fail is 2139 * because of malloc. 2140 */ 2141 error = ENOMEM; 2142 } 2143 INP_WUNLOCK(inp); 2144 break; 2145 2146 #ifdef KERN_TLS 2147 case TCP_TXTLS_ENABLE: 2148 INP_WUNLOCK(inp); 2149 error = copyin_tls_enable(sopt, &tls); 2150 if (error) 2151 break; 2152 error = ktls_enable_tx(so, &tls); 2153 break; 2154 case TCP_TXTLS_MODE: 2155 INP_WUNLOCK(inp); 2156 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2157 if (error) 2158 return (error); 2159 2160 INP_WLOCK_RECHECK(inp); 2161 error = ktls_set_tx_mode(so, ui); 2162 INP_WUNLOCK(inp); 2163 break; 2164 case TCP_RXTLS_ENABLE: 2165 INP_WUNLOCK(inp); 2166 error = sooptcopyin(sopt, &tls, sizeof(tls), 2167 sizeof(tls)); 2168 if (error) 2169 break; 2170 error = ktls_enable_rx(so, &tls); 2171 break; 2172 #endif 2173 2174 case TCP_KEEPIDLE: 2175 case TCP_KEEPINTVL: 2176 case TCP_KEEPINIT: 2177 INP_WUNLOCK(inp); 2178 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2179 if (error) 2180 return (error); 2181 2182 if (ui > (UINT_MAX / hz)) { 2183 error = EINVAL; 2184 break; 2185 } 2186 ui *= hz; 2187 2188 INP_WLOCK_RECHECK(inp); 2189 switch (sopt->sopt_name) { 2190 case TCP_KEEPIDLE: 2191 tp->t_keepidle = ui; 2192 /* 2193 * XXX: better check current remaining 2194 * timeout and "merge" it with new value. 2195 */ 2196 if ((tp->t_state > TCPS_LISTEN) && 2197 (tp->t_state <= TCPS_CLOSING)) 2198 tcp_timer_activate(tp, TT_KEEP, 2199 TP_KEEPIDLE(tp)); 2200 break; 2201 case TCP_KEEPINTVL: 2202 tp->t_keepintvl = 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 break; 2208 case TCP_KEEPINIT: 2209 tp->t_keepinit = ui; 2210 if (tp->t_state == TCPS_SYN_RECEIVED || 2211 tp->t_state == TCPS_SYN_SENT) 2212 tcp_timer_activate(tp, TT_KEEP, 2213 TP_KEEPINIT(tp)); 2214 break; 2215 } 2216 goto unlock_and_done; 2217 2218 case TCP_KEEPCNT: 2219 INP_WUNLOCK(inp); 2220 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2221 if (error) 2222 return (error); 2223 2224 INP_WLOCK_RECHECK(inp); 2225 tp->t_keepcnt = ui; 2226 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2227 (TP_MAXIDLE(tp) > 0)) 2228 tcp_timer_activate(tp, TT_2MSL, 2229 TP_MAXIDLE(tp)); 2230 goto unlock_and_done; 2231 2232 #ifdef TCPPCAP 2233 case TCP_PCAP_OUT: 2234 case TCP_PCAP_IN: 2235 INP_WUNLOCK(inp); 2236 error = sooptcopyin(sopt, &optval, sizeof optval, 2237 sizeof optval); 2238 if (error) 2239 return (error); 2240 2241 INP_WLOCK_RECHECK(inp); 2242 if (optval >= 0) 2243 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 2244 &(tp->t_outpkts) : &(tp->t_inpkts), 2245 optval); 2246 else 2247 error = EINVAL; 2248 goto unlock_and_done; 2249 #endif 2250 2251 case TCP_FASTOPEN: { 2252 struct tcp_fastopen tfo_optval; 2253 2254 INP_WUNLOCK(inp); 2255 if (!V_tcp_fastopen_client_enable && 2256 !V_tcp_fastopen_server_enable) 2257 return (EPERM); 2258 2259 error = sooptcopyin(sopt, &tfo_optval, 2260 sizeof(tfo_optval), sizeof(int)); 2261 if (error) 2262 return (error); 2263 2264 INP_WLOCK_RECHECK(inp); 2265 if ((tp->t_state != TCPS_CLOSED) && 2266 (tp->t_state != TCPS_LISTEN)) { 2267 error = EINVAL; 2268 goto unlock_and_done; 2269 } 2270 if (tfo_optval.enable) { 2271 if (tp->t_state == TCPS_LISTEN) { 2272 if (!V_tcp_fastopen_server_enable) { 2273 error = EPERM; 2274 goto unlock_and_done; 2275 } 2276 2277 if (tp->t_tfo_pending == NULL) 2278 tp->t_tfo_pending = 2279 tcp_fastopen_alloc_counter(); 2280 } else { 2281 /* 2282 * If a pre-shared key was provided, 2283 * stash it in the client cookie 2284 * field of the tcpcb for use during 2285 * connect. 2286 */ 2287 if (sopt->sopt_valsize == 2288 sizeof(tfo_optval)) { 2289 memcpy(tp->t_tfo_cookie.client, 2290 tfo_optval.psk, 2291 TCP_FASTOPEN_PSK_LEN); 2292 tp->t_tfo_client_cookie_len = 2293 TCP_FASTOPEN_PSK_LEN; 2294 } 2295 } 2296 tp->t_flags |= TF_FASTOPEN; 2297 } else 2298 tp->t_flags &= ~TF_FASTOPEN; 2299 goto unlock_and_done; 2300 } 2301 2302 #ifdef TCP_BLACKBOX 2303 case TCP_LOG: 2304 INP_WUNLOCK(inp); 2305 error = sooptcopyin(sopt, &optval, sizeof optval, 2306 sizeof optval); 2307 if (error) 2308 return (error); 2309 2310 INP_WLOCK_RECHECK(inp); 2311 error = tcp_log_state_change(tp, optval); 2312 goto unlock_and_done; 2313 2314 case TCP_LOGBUF: 2315 INP_WUNLOCK(inp); 2316 error = EINVAL; 2317 break; 2318 2319 case TCP_LOGID: 2320 INP_WUNLOCK(inp); 2321 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2322 if (error) 2323 break; 2324 buf[sopt->sopt_valsize] = '\0'; 2325 INP_WLOCK_RECHECK(inp); 2326 error = tcp_log_set_id(tp, buf); 2327 /* tcp_log_set_id() unlocks the INP. */ 2328 break; 2329 2330 case TCP_LOGDUMP: 2331 case TCP_LOGDUMPID: 2332 INP_WUNLOCK(inp); 2333 error = 2334 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2335 if (error) 2336 break; 2337 buf[sopt->sopt_valsize] = '\0'; 2338 INP_WLOCK_RECHECK(inp); 2339 if (sopt->sopt_name == TCP_LOGDUMP) { 2340 error = tcp_log_dump_tp_logbuf(tp, buf, 2341 M_WAITOK, true); 2342 INP_WUNLOCK(inp); 2343 } else { 2344 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2345 /* 2346 * tcp_log_dump_tp_bucket_logbufs() drops the 2347 * INP lock. 2348 */ 2349 } 2350 break; 2351 #endif 2352 2353 default: 2354 INP_WUNLOCK(inp); 2355 error = ENOPROTOOPT; 2356 break; 2357 } 2358 break; 2359 2360 case SOPT_GET: 2361 tp = intotcpcb(inp); 2362 switch (sopt->sopt_name) { 2363 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2364 case TCP_MD5SIG: 2365 if (!TCPMD5_ENABLED()) { 2366 INP_WUNLOCK(inp); 2367 return (ENOPROTOOPT); 2368 } 2369 error = TCPMD5_PCBCTL(inp, sopt); 2370 break; 2371 #endif 2372 2373 case TCP_NODELAY: 2374 optval = tp->t_flags & TF_NODELAY; 2375 INP_WUNLOCK(inp); 2376 error = sooptcopyout(sopt, &optval, sizeof optval); 2377 break; 2378 case TCP_MAXSEG: 2379 optval = tp->t_maxseg; 2380 INP_WUNLOCK(inp); 2381 error = sooptcopyout(sopt, &optval, sizeof optval); 2382 break; 2383 case TCP_NOOPT: 2384 optval = tp->t_flags & TF_NOOPT; 2385 INP_WUNLOCK(inp); 2386 error = sooptcopyout(sopt, &optval, sizeof optval); 2387 break; 2388 case TCP_NOPUSH: 2389 optval = tp->t_flags & TF_NOPUSH; 2390 INP_WUNLOCK(inp); 2391 error = sooptcopyout(sopt, &optval, sizeof optval); 2392 break; 2393 case TCP_INFO: 2394 tcp_fill_info(tp, &ti); 2395 INP_WUNLOCK(inp); 2396 error = sooptcopyout(sopt, &ti, sizeof ti); 2397 break; 2398 case TCP_STATS: 2399 { 2400 #ifdef STATS 2401 int nheld; 2402 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2403 2404 error = 0; 2405 socklen_t outsbsz = sopt->sopt_valsize; 2406 if (tp->t_stats == NULL) 2407 error = ENOENT; 2408 else if (outsbsz >= tp->t_stats->cursz) 2409 outsbsz = tp->t_stats->cursz; 2410 else if (outsbsz >= sizeof(struct statsblob)) 2411 outsbsz = sizeof(struct statsblob); 2412 else 2413 error = EINVAL; 2414 INP_WUNLOCK(inp); 2415 if (error) 2416 break; 2417 2418 sbp = sopt->sopt_val; 2419 nheld = atop(round_page(((vm_offset_t)sbp) + 2420 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2421 vm_page_t ma[nheld]; 2422 if (vm_fault_quick_hold_pages( 2423 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2424 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2425 nheld) < 0) { 2426 error = EFAULT; 2427 break; 2428 } 2429 2430 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2431 SIZEOF_MEMBER(struct statsblob, flags)))) 2432 goto unhold; 2433 2434 INP_WLOCK_RECHECK(inp); 2435 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2436 sbflags | SB_CLONE_USRDSTNOFAULT); 2437 INP_WUNLOCK(inp); 2438 sopt->sopt_valsize = outsbsz; 2439 unhold: 2440 vm_page_unhold_pages(ma, nheld); 2441 #else 2442 INP_WUNLOCK(inp); 2443 error = EOPNOTSUPP; 2444 #endif /* !STATS */ 2445 break; 2446 } 2447 case TCP_CONGESTION: 2448 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2449 INP_WUNLOCK(inp); 2450 error = sooptcopyout(sopt, buf, len + 1); 2451 break; 2452 case TCP_KEEPIDLE: 2453 case TCP_KEEPINTVL: 2454 case TCP_KEEPINIT: 2455 case TCP_KEEPCNT: 2456 switch (sopt->sopt_name) { 2457 case TCP_KEEPIDLE: 2458 ui = TP_KEEPIDLE(tp) / hz; 2459 break; 2460 case TCP_KEEPINTVL: 2461 ui = TP_KEEPINTVL(tp) / hz; 2462 break; 2463 case TCP_KEEPINIT: 2464 ui = TP_KEEPINIT(tp) / hz; 2465 break; 2466 case TCP_KEEPCNT: 2467 ui = TP_KEEPCNT(tp); 2468 break; 2469 } 2470 INP_WUNLOCK(inp); 2471 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2472 break; 2473 #ifdef TCPPCAP 2474 case TCP_PCAP_OUT: 2475 case TCP_PCAP_IN: 2476 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2477 &(tp->t_outpkts) : &(tp->t_inpkts)); 2478 INP_WUNLOCK(inp); 2479 error = sooptcopyout(sopt, &optval, sizeof optval); 2480 break; 2481 #endif 2482 case TCP_FASTOPEN: 2483 optval = tp->t_flags & TF_FASTOPEN; 2484 INP_WUNLOCK(inp); 2485 error = sooptcopyout(sopt, &optval, sizeof optval); 2486 break; 2487 #ifdef TCP_BLACKBOX 2488 case TCP_LOG: 2489 optval = tp->t_logstate; 2490 INP_WUNLOCK(inp); 2491 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2492 break; 2493 case TCP_LOGBUF: 2494 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2495 error = tcp_log_getlogbuf(sopt, tp); 2496 break; 2497 case TCP_LOGID: 2498 len = tcp_log_get_id(tp, buf); 2499 INP_WUNLOCK(inp); 2500 error = sooptcopyout(sopt, buf, len + 1); 2501 break; 2502 case TCP_LOGDUMP: 2503 case TCP_LOGDUMPID: 2504 INP_WUNLOCK(inp); 2505 error = EINVAL; 2506 break; 2507 #endif 2508 #ifdef KERN_TLS 2509 case TCP_TXTLS_MODE: 2510 optval = ktls_get_tx_mode(so); 2511 INP_WUNLOCK(inp); 2512 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2513 break; 2514 case TCP_RXTLS_MODE: 2515 optval = ktls_get_rx_mode(so); 2516 INP_WUNLOCK(inp); 2517 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2518 break; 2519 #endif 2520 default: 2521 INP_WUNLOCK(inp); 2522 error = ENOPROTOOPT; 2523 break; 2524 } 2525 break; 2526 } 2527 return (error); 2528 } 2529 #undef INP_WLOCK_RECHECK 2530 #undef INP_WLOCK_RECHECK_CLEANUP 2531 2532 /* 2533 * Initiate (or continue) disconnect. 2534 * If embryonic state, just send reset (once). 2535 * If in ``let data drain'' option and linger null, just drop. 2536 * Otherwise (hard), mark socket disconnecting and drop 2537 * current input data; switch states based on user close, and 2538 * send segment to peer (with FIN). 2539 */ 2540 static void 2541 tcp_disconnect(struct tcpcb *tp) 2542 { 2543 struct inpcb *inp = tp->t_inpcb; 2544 struct socket *so = inp->inp_socket; 2545 2546 NET_EPOCH_ASSERT(); 2547 INP_WLOCK_ASSERT(inp); 2548 2549 /* 2550 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2551 * socket is still open. 2552 */ 2553 if (tp->t_state < TCPS_ESTABLISHED && 2554 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2555 tp = tcp_close(tp); 2556 KASSERT(tp != NULL, 2557 ("tcp_disconnect: tcp_close() returned NULL")); 2558 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2559 tp = tcp_drop(tp, 0); 2560 KASSERT(tp != NULL, 2561 ("tcp_disconnect: tcp_drop() returned NULL")); 2562 } else { 2563 soisdisconnecting(so); 2564 sbflush(&so->so_rcv); 2565 tcp_usrclosed(tp); 2566 if (!(inp->inp_flags & INP_DROPPED)) 2567 tp->t_fb->tfb_tcp_output(tp); 2568 } 2569 } 2570 2571 /* 2572 * User issued close, and wish to trail through shutdown states: 2573 * if never received SYN, just forget it. If got a SYN from peer, 2574 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2575 * If already got a FIN from peer, then almost done; go to LAST_ACK 2576 * state. In all other cases, have already sent FIN to peer (e.g. 2577 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2578 * for peer to send FIN or not respond to keep-alives, etc. 2579 * We can let the user exit from the close as soon as the FIN is acked. 2580 */ 2581 static void 2582 tcp_usrclosed(struct tcpcb *tp) 2583 { 2584 2585 NET_EPOCH_ASSERT(); 2586 INP_WLOCK_ASSERT(tp->t_inpcb); 2587 2588 switch (tp->t_state) { 2589 case TCPS_LISTEN: 2590 #ifdef TCP_OFFLOAD 2591 tcp_offload_listen_stop(tp); 2592 #endif 2593 tcp_state_change(tp, TCPS_CLOSED); 2594 /* FALLTHROUGH */ 2595 case TCPS_CLOSED: 2596 tp = tcp_close(tp); 2597 /* 2598 * tcp_close() should never return NULL here as the socket is 2599 * still open. 2600 */ 2601 KASSERT(tp != NULL, 2602 ("tcp_usrclosed: tcp_close() returned NULL")); 2603 break; 2604 2605 case TCPS_SYN_SENT: 2606 case TCPS_SYN_RECEIVED: 2607 tp->t_flags |= TF_NEEDFIN; 2608 break; 2609 2610 case TCPS_ESTABLISHED: 2611 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2612 break; 2613 2614 case TCPS_CLOSE_WAIT: 2615 tcp_state_change(tp, TCPS_LAST_ACK); 2616 break; 2617 } 2618 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2619 soisdisconnected(tp->t_inpcb->inp_socket); 2620 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2621 if (tp->t_state == TCPS_FIN_WAIT_2) { 2622 int timeout; 2623 2624 timeout = (tcp_fast_finwait2_recycle) ? 2625 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2626 tcp_timer_activate(tp, TT_2MSL, timeout); 2627 } 2628 } 2629 } 2630 2631 #ifdef DDB 2632 static void 2633 db_print_indent(int indent) 2634 { 2635 int i; 2636 2637 for (i = 0; i < indent; i++) 2638 db_printf(" "); 2639 } 2640 2641 static void 2642 db_print_tstate(int t_state) 2643 { 2644 2645 switch (t_state) { 2646 case TCPS_CLOSED: 2647 db_printf("TCPS_CLOSED"); 2648 return; 2649 2650 case TCPS_LISTEN: 2651 db_printf("TCPS_LISTEN"); 2652 return; 2653 2654 case TCPS_SYN_SENT: 2655 db_printf("TCPS_SYN_SENT"); 2656 return; 2657 2658 case TCPS_SYN_RECEIVED: 2659 db_printf("TCPS_SYN_RECEIVED"); 2660 return; 2661 2662 case TCPS_ESTABLISHED: 2663 db_printf("TCPS_ESTABLISHED"); 2664 return; 2665 2666 case TCPS_CLOSE_WAIT: 2667 db_printf("TCPS_CLOSE_WAIT"); 2668 return; 2669 2670 case TCPS_FIN_WAIT_1: 2671 db_printf("TCPS_FIN_WAIT_1"); 2672 return; 2673 2674 case TCPS_CLOSING: 2675 db_printf("TCPS_CLOSING"); 2676 return; 2677 2678 case TCPS_LAST_ACK: 2679 db_printf("TCPS_LAST_ACK"); 2680 return; 2681 2682 case TCPS_FIN_WAIT_2: 2683 db_printf("TCPS_FIN_WAIT_2"); 2684 return; 2685 2686 case TCPS_TIME_WAIT: 2687 db_printf("TCPS_TIME_WAIT"); 2688 return; 2689 2690 default: 2691 db_printf("unknown"); 2692 return; 2693 } 2694 } 2695 2696 static void 2697 db_print_tflags(u_int t_flags) 2698 { 2699 int comma; 2700 2701 comma = 0; 2702 if (t_flags & TF_ACKNOW) { 2703 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2704 comma = 1; 2705 } 2706 if (t_flags & TF_DELACK) { 2707 db_printf("%sTF_DELACK", comma ? ", " : ""); 2708 comma = 1; 2709 } 2710 if (t_flags & TF_NODELAY) { 2711 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2712 comma = 1; 2713 } 2714 if (t_flags & TF_NOOPT) { 2715 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2716 comma = 1; 2717 } 2718 if (t_flags & TF_SENTFIN) { 2719 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2720 comma = 1; 2721 } 2722 if (t_flags & TF_REQ_SCALE) { 2723 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2724 comma = 1; 2725 } 2726 if (t_flags & TF_RCVD_SCALE) { 2727 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2728 comma = 1; 2729 } 2730 if (t_flags & TF_REQ_TSTMP) { 2731 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2732 comma = 1; 2733 } 2734 if (t_flags & TF_RCVD_TSTMP) { 2735 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2736 comma = 1; 2737 } 2738 if (t_flags & TF_SACK_PERMIT) { 2739 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2740 comma = 1; 2741 } 2742 if (t_flags & TF_NEEDSYN) { 2743 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2744 comma = 1; 2745 } 2746 if (t_flags & TF_NEEDFIN) { 2747 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2748 comma = 1; 2749 } 2750 if (t_flags & TF_NOPUSH) { 2751 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2752 comma = 1; 2753 } 2754 if (t_flags & TF_MORETOCOME) { 2755 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2756 comma = 1; 2757 } 2758 if (t_flags & TF_LQ_OVERFLOW) { 2759 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2760 comma = 1; 2761 } 2762 if (t_flags & TF_LASTIDLE) { 2763 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2764 comma = 1; 2765 } 2766 if (t_flags & TF_RXWIN0SENT) { 2767 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2768 comma = 1; 2769 } 2770 if (t_flags & TF_FASTRECOVERY) { 2771 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2772 comma = 1; 2773 } 2774 if (t_flags & TF_CONGRECOVERY) { 2775 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2776 comma = 1; 2777 } 2778 if (t_flags & TF_WASFRECOVERY) { 2779 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2780 comma = 1; 2781 } 2782 if (t_flags & TF_SIGNATURE) { 2783 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2784 comma = 1; 2785 } 2786 if (t_flags & TF_FORCEDATA) { 2787 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2788 comma = 1; 2789 } 2790 if (t_flags & TF_TSO) { 2791 db_printf("%sTF_TSO", comma ? ", " : ""); 2792 comma = 1; 2793 } 2794 if (t_flags & TF_FASTOPEN) { 2795 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2796 comma = 1; 2797 } 2798 } 2799 2800 static void 2801 db_print_tflags2(u_int t_flags2) 2802 { 2803 int comma; 2804 2805 comma = 0; 2806 if (t_flags2 & TF2_ECN_PERMIT) { 2807 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : ""); 2808 comma = 1; 2809 } 2810 } 2811 2812 static void 2813 db_print_toobflags(char t_oobflags) 2814 { 2815 int comma; 2816 2817 comma = 0; 2818 if (t_oobflags & TCPOOB_HAVEDATA) { 2819 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2820 comma = 1; 2821 } 2822 if (t_oobflags & TCPOOB_HADDATA) { 2823 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2824 comma = 1; 2825 } 2826 } 2827 2828 static void 2829 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2830 { 2831 2832 db_print_indent(indent); 2833 db_printf("%s at %p\n", name, tp); 2834 2835 indent += 2; 2836 2837 db_print_indent(indent); 2838 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2839 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2840 2841 db_print_indent(indent); 2842 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2843 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2844 2845 db_print_indent(indent); 2846 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2847 &tp->t_timers->tt_delack, tp->t_inpcb); 2848 2849 db_print_indent(indent); 2850 db_printf("t_state: %d (", tp->t_state); 2851 db_print_tstate(tp->t_state); 2852 db_printf(")\n"); 2853 2854 db_print_indent(indent); 2855 db_printf("t_flags: 0x%x (", tp->t_flags); 2856 db_print_tflags(tp->t_flags); 2857 db_printf(")\n"); 2858 2859 db_print_indent(indent); 2860 db_printf("t_flags2: 0x%x (", tp->t_flags2); 2861 db_print_tflags2(tp->t_flags2); 2862 db_printf(")\n"); 2863 2864 db_print_indent(indent); 2865 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2866 tp->snd_una, tp->snd_max, tp->snd_nxt); 2867 2868 db_print_indent(indent); 2869 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2870 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2871 2872 db_print_indent(indent); 2873 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2874 tp->iss, tp->irs, tp->rcv_nxt); 2875 2876 db_print_indent(indent); 2877 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2878 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2879 2880 db_print_indent(indent); 2881 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2882 tp->snd_wnd, tp->snd_cwnd); 2883 2884 db_print_indent(indent); 2885 db_printf("snd_ssthresh: %u snd_recover: " 2886 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2887 2888 db_print_indent(indent); 2889 db_printf("t_rcvtime: %u t_startime: %u\n", 2890 tp->t_rcvtime, tp->t_starttime); 2891 2892 db_print_indent(indent); 2893 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2894 tp->t_rtttime, tp->t_rtseq); 2895 2896 db_print_indent(indent); 2897 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2898 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2899 2900 db_print_indent(indent); 2901 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2902 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2903 tp->t_rttbest); 2904 2905 db_print_indent(indent); 2906 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2907 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2908 2909 db_print_indent(indent); 2910 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2911 db_print_toobflags(tp->t_oobflags); 2912 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2913 2914 db_print_indent(indent); 2915 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2916 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2917 2918 db_print_indent(indent); 2919 db_printf("ts_recent: %u ts_recent_age: %u\n", 2920 tp->ts_recent, tp->ts_recent_age); 2921 2922 db_print_indent(indent); 2923 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2924 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2925 2926 db_print_indent(indent); 2927 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2928 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2929 tp->snd_recover_prev, tp->t_badrxtwin); 2930 2931 db_print_indent(indent); 2932 db_printf("snd_numholes: %d snd_holes first: %p\n", 2933 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2934 2935 db_print_indent(indent); 2936 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n", 2937 tp->snd_fack, tp->rcv_numsacks); 2938 2939 /* Skip sackblks, sackhint. */ 2940 2941 db_print_indent(indent); 2942 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2943 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2944 } 2945 2946 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2947 { 2948 struct tcpcb *tp; 2949 2950 if (!have_addr) { 2951 db_printf("usage: show tcpcb <addr>\n"); 2952 return; 2953 } 2954 tp = (struct tcpcb *)addr; 2955 2956 db_print_tcpcb(tp, "tcpcb", 0); 2957 } 2958 #endif 2959