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 attaches to socket via pru_attach(), reserving space, 151 * and an internet control block. 152 */ 153 static int 154 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 155 { 156 struct inpcb *inp; 157 struct tcpcb *tp = NULL; 158 int error; 159 TCPDEBUG0; 160 161 inp = sotoinpcb(so); 162 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 163 TCPDEBUG1(); 164 165 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 166 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 167 if (error) 168 goto out; 169 } 170 171 so->so_rcv.sb_flags |= SB_AUTOSIZE; 172 so->so_snd.sb_flags |= SB_AUTOSIZE; 173 error = in_pcballoc(so, &V_tcbinfo); 174 if (error) 175 goto out; 176 inp = sotoinpcb(so); 177 #ifdef INET6 178 if (inp->inp_vflag & INP_IPV6PROTO) { 179 inp->inp_vflag |= INP_IPV6; 180 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 181 inp->inp_vflag |= INP_IPV4; 182 inp->in6p_hops = -1; /* use kernel default */ 183 } 184 else 185 #endif 186 inp->inp_vflag |= INP_IPV4; 187 tp = tcp_newtcpcb(inp); 188 if (tp == NULL) { 189 error = ENOBUFS; 190 in_pcbdetach(inp); 191 in_pcbfree(inp); 192 goto out; 193 } 194 tp->t_state = TCPS_CLOSED; 195 INP_WUNLOCK(inp); 196 TCPSTATES_INC(TCPS_CLOSED); 197 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 198 so->so_linger = TCP_LINGERTIME; 199 out: 200 TCPDEBUG2(PRU_ATTACH); 201 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 202 return (error); 203 } 204 205 /* 206 * tcp_usr_detach is called when the socket layer loses its final reference 207 * to the socket, be it a file descriptor reference, a reference from TCP, 208 * etc. At this point, there is only one case in which we will keep around 209 * inpcb state: time wait. 210 */ 211 static void 212 tcp_usr_detach(struct socket *so) 213 { 214 struct inpcb *inp; 215 struct tcpcb *tp; 216 217 inp = sotoinpcb(so); 218 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 219 INP_WLOCK(inp); 220 KASSERT(so->so_pcb == inp && inp->inp_socket == so, 221 ("%s: socket %p inp %p mismatch", __func__, so, inp)); 222 223 tp = intotcpcb(inp); 224 225 if (inp->inp_flags & INP_TIMEWAIT) { 226 /* 227 * There are two cases to handle: one in which the time wait 228 * state is being discarded (INP_DROPPED), and one in which 229 * this connection will remain in timewait. In the former, 230 * it is time to discard all state (except tcptw, which has 231 * already been discarded by the timewait close code, which 232 * should be further up the call stack somewhere). In the 233 * latter case, we detach from the socket, but leave the pcb 234 * present until timewait ends. 235 * 236 * XXXRW: Would it be cleaner to free the tcptw here? 237 * 238 * Astute question indeed, from twtcp perspective there are 239 * four cases to consider: 240 * 241 * #1 tcp_usr_detach is called at tcptw creation time by 242 * tcp_twstart, then do not discard the newly created tcptw 243 * and leave inpcb present until timewait ends 244 * #2 tcp_usr_detach is called at tcptw creation time by 245 * tcp_twstart, but connection is local and tw will be 246 * discarded immediately 247 * #3 tcp_usr_detach is called at timewait end (or reuse) by 248 * tcp_twclose, then the tcptw has already been discarded 249 * (or reused) and inpcb is freed here 250 * #4 tcp_usr_detach is called() after timewait ends (or reuse) 251 * (e.g. by soclose), then tcptw has already been discarded 252 * (or reused) and inpcb is freed here 253 * 254 * In all three cases the tcptw should not be freed here. 255 */ 256 if (inp->inp_flags & INP_DROPPED) { 257 in_pcbdetach(inp); 258 if (__predict_true(tp == NULL)) { 259 in_pcbfree(inp); 260 } else { 261 /* 262 * This case should not happen as in TIMEWAIT 263 * state the inp should not be destroyed before 264 * its tcptw. If INVARIANTS is defined, panic. 265 */ 266 #ifdef INVARIANTS 267 panic("%s: Panic before an inp double-free: " 268 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 269 , __func__); 270 #else 271 log(LOG_ERR, "%s: Avoid an inp double-free: " 272 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 273 , __func__); 274 #endif 275 INP_WUNLOCK(inp); 276 } 277 } else { 278 in_pcbdetach(inp); 279 INP_WUNLOCK(inp); 280 } 281 } else { 282 /* 283 * If the connection is not in timewait, we consider two 284 * two conditions: one in which no further processing is 285 * necessary (dropped || embryonic), and one in which TCP is 286 * not yet done, but no longer requires the socket, so the 287 * pcb will persist for the time being. 288 * 289 * XXXRW: Does the second case still occur? 290 */ 291 if (inp->inp_flags & INP_DROPPED || 292 tp->t_state < TCPS_SYN_SENT) { 293 tcp_discardcb(tp); 294 in_pcbdetach(inp); 295 in_pcbfree(inp); 296 } else { 297 in_pcbdetach(inp); 298 INP_WUNLOCK(inp); 299 } 300 } 301 } 302 303 #ifdef INET 304 /* 305 * Give the socket an address. 306 */ 307 static int 308 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 309 { 310 int error = 0; 311 struct inpcb *inp; 312 struct tcpcb *tp = NULL; 313 struct sockaddr_in *sinp; 314 315 sinp = (struct sockaddr_in *)nam; 316 if (nam->sa_len != sizeof (*sinp)) 317 return (EINVAL); 318 /* 319 * Must check for multicast addresses and disallow binding 320 * to them. 321 */ 322 if (sinp->sin_family == AF_INET && 323 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 324 return (EAFNOSUPPORT); 325 326 TCPDEBUG0; 327 inp = sotoinpcb(so); 328 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 329 INP_WLOCK(inp); 330 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 331 error = EINVAL; 332 goto out; 333 } 334 tp = intotcpcb(inp); 335 TCPDEBUG1(); 336 INP_HASH_WLOCK(&V_tcbinfo); 337 error = in_pcbbind(inp, nam, td->td_ucred); 338 INP_HASH_WUNLOCK(&V_tcbinfo); 339 out: 340 TCPDEBUG2(PRU_BIND); 341 TCP_PROBE2(debug__user, tp, PRU_BIND); 342 INP_WUNLOCK(inp); 343 344 return (error); 345 } 346 #endif /* INET */ 347 348 #ifdef INET6 349 static int 350 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 351 { 352 int error = 0; 353 struct inpcb *inp; 354 struct tcpcb *tp = NULL; 355 struct sockaddr_in6 *sin6; 356 u_char vflagsav; 357 358 sin6 = (struct sockaddr_in6 *)nam; 359 if (nam->sa_len != sizeof (*sin6)) 360 return (EINVAL); 361 /* 362 * Must check for multicast addresses and disallow binding 363 * to them. 364 */ 365 if (sin6->sin6_family == AF_INET6 && 366 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 367 return (EAFNOSUPPORT); 368 369 TCPDEBUG0; 370 inp = sotoinpcb(so); 371 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 372 INP_WLOCK(inp); 373 vflagsav = inp->inp_vflag; 374 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 375 error = EINVAL; 376 goto out; 377 } 378 tp = intotcpcb(inp); 379 TCPDEBUG1(); 380 INP_HASH_WLOCK(&V_tcbinfo); 381 inp->inp_vflag &= ~INP_IPV4; 382 inp->inp_vflag |= INP_IPV6; 383 #ifdef INET 384 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 385 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 386 inp->inp_vflag |= INP_IPV4; 387 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 388 struct sockaddr_in sin; 389 390 in6_sin6_2_sin(&sin, sin6); 391 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 392 error = EAFNOSUPPORT; 393 INP_HASH_WUNLOCK(&V_tcbinfo); 394 goto out; 395 } 396 inp->inp_vflag |= INP_IPV4; 397 inp->inp_vflag &= ~INP_IPV6; 398 error = in_pcbbind(inp, (struct sockaddr *)&sin, 399 td->td_ucred); 400 INP_HASH_WUNLOCK(&V_tcbinfo); 401 goto out; 402 } 403 } 404 #endif 405 error = in6_pcbbind(inp, nam, td->td_ucred); 406 INP_HASH_WUNLOCK(&V_tcbinfo); 407 out: 408 if (error != 0) 409 inp->inp_vflag = vflagsav; 410 TCPDEBUG2(PRU_BIND); 411 TCP_PROBE2(debug__user, tp, PRU_BIND); 412 INP_WUNLOCK(inp); 413 return (error); 414 } 415 #endif /* INET6 */ 416 417 #ifdef INET 418 /* 419 * Prepare to accept connections. 420 */ 421 static int 422 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 423 { 424 int error = 0; 425 struct inpcb *inp; 426 struct tcpcb *tp = NULL; 427 428 TCPDEBUG0; 429 inp = sotoinpcb(so); 430 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 431 INP_WLOCK(inp); 432 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 433 error = EINVAL; 434 goto out; 435 } 436 tp = intotcpcb(inp); 437 TCPDEBUG1(); 438 SOCK_LOCK(so); 439 error = solisten_proto_check(so); 440 INP_HASH_WLOCK(&V_tcbinfo); 441 if (error == 0 && inp->inp_lport == 0) 442 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 443 INP_HASH_WUNLOCK(&V_tcbinfo); 444 if (error == 0) { 445 tcp_state_change(tp, TCPS_LISTEN); 446 solisten_proto(so, backlog); 447 #ifdef TCP_OFFLOAD 448 if ((so->so_options & SO_NO_OFFLOAD) == 0) 449 tcp_offload_listen_start(tp); 450 #endif 451 } 452 SOCK_UNLOCK(so); 453 454 if (IS_FASTOPEN(tp->t_flags)) 455 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 456 457 out: 458 TCPDEBUG2(PRU_LISTEN); 459 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 460 INP_WUNLOCK(inp); 461 return (error); 462 } 463 #endif /* INET */ 464 465 #ifdef INET6 466 static int 467 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 468 { 469 int error = 0; 470 struct inpcb *inp; 471 struct tcpcb *tp = NULL; 472 u_char vflagsav; 473 474 TCPDEBUG0; 475 inp = sotoinpcb(so); 476 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 477 INP_WLOCK(inp); 478 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 479 error = EINVAL; 480 goto out; 481 } 482 vflagsav = inp->inp_vflag; 483 tp = intotcpcb(inp); 484 TCPDEBUG1(); 485 SOCK_LOCK(so); 486 error = solisten_proto_check(so); 487 INP_HASH_WLOCK(&V_tcbinfo); 488 if (error == 0 && inp->inp_lport == 0) { 489 inp->inp_vflag &= ~INP_IPV4; 490 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 491 inp->inp_vflag |= INP_IPV4; 492 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 493 } 494 INP_HASH_WUNLOCK(&V_tcbinfo); 495 if (error == 0) { 496 tcp_state_change(tp, TCPS_LISTEN); 497 solisten_proto(so, backlog); 498 #ifdef TCP_OFFLOAD 499 if ((so->so_options & SO_NO_OFFLOAD) == 0) 500 tcp_offload_listen_start(tp); 501 #endif 502 } 503 SOCK_UNLOCK(so); 504 505 if (IS_FASTOPEN(tp->t_flags)) 506 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 507 508 if (error != 0) 509 inp->inp_vflag = vflagsav; 510 511 out: 512 TCPDEBUG2(PRU_LISTEN); 513 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 514 INP_WUNLOCK(inp); 515 return (error); 516 } 517 #endif /* INET6 */ 518 519 #ifdef INET 520 /* 521 * Initiate connection to peer. 522 * Create a template for use in transmissions on this connection. 523 * Enter SYN_SENT state, and mark socket as connecting. 524 * Start keep-alive timer, and seed output sequence space. 525 * Send initial segment on connection. 526 */ 527 static int 528 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 529 { 530 struct epoch_tracker et; 531 int error = 0; 532 struct inpcb *inp; 533 struct tcpcb *tp = NULL; 534 struct sockaddr_in *sinp; 535 536 sinp = (struct sockaddr_in *)nam; 537 if (nam->sa_len != sizeof (*sinp)) 538 return (EINVAL); 539 /* 540 * Must disallow TCP ``connections'' to multicast addresses. 541 */ 542 if (sinp->sin_family == AF_INET 543 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 544 return (EAFNOSUPPORT); 545 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 546 return (error); 547 548 TCPDEBUG0; 549 inp = sotoinpcb(so); 550 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 551 INP_WLOCK(inp); 552 if (inp->inp_flags & INP_TIMEWAIT) { 553 error = EADDRINUSE; 554 goto out; 555 } 556 if (inp->inp_flags & INP_DROPPED) { 557 error = ECONNREFUSED; 558 goto out; 559 } 560 tp = intotcpcb(inp); 561 TCPDEBUG1(); 562 NET_EPOCH_ENTER(et); 563 if ((error = tcp_connect(tp, nam, td)) != 0) 564 goto out_in_epoch; 565 #ifdef TCP_OFFLOAD 566 if (registered_toedevs > 0 && 567 (so->so_options & SO_NO_OFFLOAD) == 0 && 568 (error = tcp_offload_connect(so, nam)) == 0) 569 goto out_in_epoch; 570 #endif 571 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 572 error = tp->t_fb->tfb_tcp_output(tp); 573 out_in_epoch: 574 NET_EPOCH_EXIT(et); 575 out: 576 TCPDEBUG2(PRU_CONNECT); 577 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 578 INP_WUNLOCK(inp); 579 return (error); 580 } 581 #endif /* INET */ 582 583 #ifdef INET6 584 static int 585 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 586 { 587 struct epoch_tracker et; 588 int error = 0; 589 struct inpcb *inp; 590 struct tcpcb *tp = NULL; 591 struct sockaddr_in6 *sin6; 592 u_int8_t incflagsav; 593 u_char vflagsav; 594 595 TCPDEBUG0; 596 597 sin6 = (struct sockaddr_in6 *)nam; 598 if (nam->sa_len != sizeof (*sin6)) 599 return (EINVAL); 600 /* 601 * Must disallow TCP ``connections'' to multicast addresses. 602 */ 603 if (sin6->sin6_family == AF_INET6 604 && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 605 return (EAFNOSUPPORT); 606 607 inp = sotoinpcb(so); 608 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 609 INP_WLOCK(inp); 610 vflagsav = inp->inp_vflag; 611 incflagsav = inp->inp_inc.inc_flags; 612 if (inp->inp_flags & INP_TIMEWAIT) { 613 error = EADDRINUSE; 614 goto out; 615 } 616 if (inp->inp_flags & INP_DROPPED) { 617 error = ECONNREFUSED; 618 goto out; 619 } 620 tp = intotcpcb(inp); 621 TCPDEBUG1(); 622 #ifdef INET 623 /* 624 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 625 * therefore probably require the hash lock, which isn't held here. 626 * Is this a significant problem? 627 */ 628 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 629 struct sockaddr_in sin; 630 631 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 632 error = EINVAL; 633 goto out; 634 } 635 if ((inp->inp_vflag & INP_IPV4) == 0) { 636 error = EAFNOSUPPORT; 637 goto out; 638 } 639 640 in6_sin6_2_sin(&sin, sin6); 641 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 642 error = EAFNOSUPPORT; 643 goto out; 644 } 645 if ((error = prison_remote_ip4(td->td_ucred, 646 &sin.sin_addr)) != 0) 647 goto out; 648 inp->inp_vflag |= INP_IPV4; 649 inp->inp_vflag &= ~INP_IPV6; 650 NET_EPOCH_ENTER(et); 651 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 652 goto out_in_epoch; 653 #ifdef TCP_OFFLOAD 654 if (registered_toedevs > 0 && 655 (so->so_options & SO_NO_OFFLOAD) == 0 && 656 (error = tcp_offload_connect(so, nam)) == 0) 657 goto out_in_epoch; 658 #endif 659 error = tp->t_fb->tfb_tcp_output(tp); 660 goto out_in_epoch; 661 } else { 662 if ((inp->inp_vflag & INP_IPV6) == 0) { 663 error = EAFNOSUPPORT; 664 goto out; 665 } 666 } 667 #endif 668 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 669 goto out; 670 inp->inp_vflag &= ~INP_IPV4; 671 inp->inp_vflag |= INP_IPV6; 672 inp->inp_inc.inc_flags |= INC_ISIPV6; 673 if ((error = tcp6_connect(tp, nam, td)) != 0) 674 goto out; 675 #ifdef TCP_OFFLOAD 676 if (registered_toedevs > 0 && 677 (so->so_options & SO_NO_OFFLOAD) == 0 && 678 (error = tcp_offload_connect(so, nam)) == 0) 679 goto out; 680 #endif 681 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 682 NET_EPOCH_ENTER(et); 683 error = tp->t_fb->tfb_tcp_output(tp); 684 #ifdef INET 685 out_in_epoch: 686 #endif 687 NET_EPOCH_EXIT(et); 688 out: 689 /* 690 * If the implicit bind in the connect call fails, restore 691 * the flags we modified. 692 */ 693 if (error != 0 && inp->inp_lport == 0) { 694 inp->inp_vflag = vflagsav; 695 inp->inp_inc.inc_flags = incflagsav; 696 } 697 698 TCPDEBUG2(PRU_CONNECT); 699 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 700 INP_WUNLOCK(inp); 701 return (error); 702 } 703 #endif /* INET6 */ 704 705 /* 706 * Initiate disconnect from peer. 707 * If connection never passed embryonic stage, just drop; 708 * else if don't need to let data drain, then can just drop anyways, 709 * else have to begin TCP shutdown process: mark socket disconnecting, 710 * drain unread data, state switch to reflect user close, and 711 * send segment (e.g. FIN) to peer. Socket will be really disconnected 712 * when peer sends FIN and acks ours. 713 * 714 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 715 */ 716 static int 717 tcp_usr_disconnect(struct socket *so) 718 { 719 struct inpcb *inp; 720 struct tcpcb *tp = NULL; 721 struct epoch_tracker et; 722 int error = 0; 723 724 TCPDEBUG0; 725 NET_EPOCH_ENTER(et); 726 inp = sotoinpcb(so); 727 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 728 INP_WLOCK(inp); 729 if (inp->inp_flags & INP_TIMEWAIT) 730 goto out; 731 if (inp->inp_flags & INP_DROPPED) { 732 error = ECONNRESET; 733 goto out; 734 } 735 tp = intotcpcb(inp); 736 TCPDEBUG1(); 737 tcp_disconnect(tp); 738 out: 739 TCPDEBUG2(PRU_DISCONNECT); 740 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 741 INP_WUNLOCK(inp); 742 NET_EPOCH_EXIT(et); 743 return (error); 744 } 745 746 #ifdef INET 747 /* 748 * Accept a connection. Essentially all the work is done at higher levels; 749 * just return the address of the peer, storing through addr. 750 */ 751 static int 752 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 753 { 754 int error = 0; 755 struct inpcb *inp = NULL; 756 struct tcpcb *tp = NULL; 757 struct in_addr addr; 758 in_port_t port = 0; 759 TCPDEBUG0; 760 761 if (so->so_state & SS_ISDISCONNECTED) 762 return (ECONNABORTED); 763 764 inp = sotoinpcb(so); 765 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 766 INP_WLOCK(inp); 767 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 768 error = ECONNABORTED; 769 goto out; 770 } 771 tp = intotcpcb(inp); 772 TCPDEBUG1(); 773 774 /* 775 * We inline in_getpeeraddr and COMMON_END here, so that we can 776 * copy the data of interest and defer the malloc until after we 777 * release the lock. 778 */ 779 port = inp->inp_fport; 780 addr = inp->inp_faddr; 781 782 out: 783 TCPDEBUG2(PRU_ACCEPT); 784 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 785 INP_WUNLOCK(inp); 786 if (error == 0) 787 *nam = in_sockaddr(port, &addr); 788 return error; 789 } 790 #endif /* INET */ 791 792 #ifdef INET6 793 static int 794 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 795 { 796 struct inpcb *inp = NULL; 797 int error = 0; 798 struct tcpcb *tp = NULL; 799 struct in_addr addr; 800 struct in6_addr addr6; 801 struct epoch_tracker et; 802 in_port_t port = 0; 803 int v4 = 0; 804 TCPDEBUG0; 805 806 if (so->so_state & SS_ISDISCONNECTED) 807 return (ECONNABORTED); 808 809 inp = sotoinpcb(so); 810 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 811 NET_EPOCH_ENTER(et); 812 INP_WLOCK(inp); 813 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 814 error = ECONNABORTED; 815 goto out; 816 } 817 tp = intotcpcb(inp); 818 TCPDEBUG1(); 819 820 /* 821 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 822 * copy the data of interest and defer the malloc until after we 823 * release the lock. 824 */ 825 if (inp->inp_vflag & INP_IPV4) { 826 v4 = 1; 827 port = inp->inp_fport; 828 addr = inp->inp_faddr; 829 } else { 830 port = inp->inp_fport; 831 addr6 = inp->in6p_faddr; 832 } 833 834 out: 835 TCPDEBUG2(PRU_ACCEPT); 836 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 837 INP_WUNLOCK(inp); 838 NET_EPOCH_EXIT(et); 839 if (error == 0) { 840 if (v4) 841 *nam = in6_v4mapsin6_sockaddr(port, &addr); 842 else 843 *nam = in6_sockaddr(port, &addr6); 844 } 845 return error; 846 } 847 #endif /* INET6 */ 848 849 /* 850 * Mark the connection as being incapable of further output. 851 */ 852 static int 853 tcp_usr_shutdown(struct socket *so) 854 { 855 int error = 0; 856 struct inpcb *inp; 857 struct tcpcb *tp = NULL; 858 struct epoch_tracker et; 859 860 TCPDEBUG0; 861 NET_EPOCH_ENTER(et); 862 inp = sotoinpcb(so); 863 KASSERT(inp != NULL, ("inp == NULL")); 864 INP_WLOCK(inp); 865 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 866 error = ECONNRESET; 867 goto out; 868 } 869 tp = intotcpcb(inp); 870 TCPDEBUG1(); 871 socantsendmore(so); 872 tcp_usrclosed(tp); 873 if (!(inp->inp_flags & INP_DROPPED)) 874 error = tp->t_fb->tfb_tcp_output(tp); 875 876 out: 877 TCPDEBUG2(PRU_SHUTDOWN); 878 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 879 INP_WUNLOCK(inp); 880 NET_EPOCH_EXIT(et); 881 882 return (error); 883 } 884 885 /* 886 * After a receive, possibly send window update to peer. 887 */ 888 static int 889 tcp_usr_rcvd(struct socket *so, int flags) 890 { 891 struct epoch_tracker et; 892 struct inpcb *inp; 893 struct tcpcb *tp = NULL; 894 int error = 0; 895 896 TCPDEBUG0; 897 inp = sotoinpcb(so); 898 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 899 INP_WLOCK(inp); 900 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 901 error = ECONNRESET; 902 goto out; 903 } 904 tp = intotcpcb(inp); 905 TCPDEBUG1(); 906 /* 907 * For passively-created TFO connections, don't attempt a window 908 * update while still in SYN_RECEIVED as this may trigger an early 909 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 910 * application response data, or failing that, when the DELACK timer 911 * expires. 912 */ 913 if (IS_FASTOPEN(tp->t_flags) && 914 (tp->t_state == TCPS_SYN_RECEIVED)) 915 goto out; 916 NET_EPOCH_ENTER(et); 917 #ifdef TCP_OFFLOAD 918 if (tp->t_flags & TF_TOE) 919 tcp_offload_rcvd(tp); 920 else 921 #endif 922 tp->t_fb->tfb_tcp_output(tp); 923 NET_EPOCH_EXIT(et); 924 out: 925 TCPDEBUG2(PRU_RCVD); 926 TCP_PROBE2(debug__user, tp, PRU_RCVD); 927 INP_WUNLOCK(inp); 928 return (error); 929 } 930 931 /* 932 * Do a send by putting data in output queue and updating urgent 933 * marker if URG set. Possibly send more data. Unlike the other 934 * pru_*() routines, the mbuf chains are our responsibility. We 935 * must either enqueue them or free them. The other pru_* routines 936 * generally are caller-frees. 937 */ 938 static int 939 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 940 struct sockaddr *nam, struct mbuf *control, struct thread *td) 941 { 942 struct epoch_tracker et; 943 int error = 0; 944 struct inpcb *inp; 945 struct tcpcb *tp = NULL; 946 #ifdef INET 947 #ifdef INET6 948 struct sockaddr_in sin; 949 #endif 950 struct sockaddr_in *sinp; 951 #endif 952 #ifdef INET6 953 int isipv6; 954 #endif 955 u_int8_t incflagsav; 956 u_char vflagsav; 957 bool restoreflags; 958 TCPDEBUG0; 959 960 /* 961 * We require the pcbinfo "read lock" if we will close the socket 962 * as part of this call. 963 */ 964 NET_EPOCH_ENTER(et); 965 inp = sotoinpcb(so); 966 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 967 INP_WLOCK(inp); 968 vflagsav = inp->inp_vflag; 969 incflagsav = inp->inp_inc.inc_flags; 970 restoreflags = false; 971 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 972 if (control) 973 m_freem(control); 974 /* 975 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 976 * for freeing memory. 977 */ 978 if (m && (flags & PRUS_NOTREADY) == 0) 979 m_freem(m); 980 error = ECONNRESET; 981 goto out; 982 } 983 tp = intotcpcb(inp); 984 if (flags & PRUS_OOB) { 985 if ((error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) { 986 if (control) 987 m_freem(control); 988 if (m && (flags & PRUS_NOTREADY) == 0) 989 m_freem(m); 990 goto out; 991 } 992 } 993 TCPDEBUG1(); 994 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 995 switch (nam->sa_family) { 996 #ifdef INET 997 case AF_INET: 998 sinp = (struct sockaddr_in *)nam; 999 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 1000 if (m) 1001 m_freem(m); 1002 error = EINVAL; 1003 goto out; 1004 } 1005 if ((inp->inp_vflag & INP_IPV6) != 0) { 1006 if (m) 1007 m_freem(m); 1008 error = EAFNOSUPPORT; 1009 goto out; 1010 } 1011 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 1012 if (m) 1013 m_freem(m); 1014 error = EAFNOSUPPORT; 1015 goto out; 1016 } 1017 if ((error = prison_remote_ip4(td->td_ucred, 1018 &sinp->sin_addr))) { 1019 if (m) 1020 m_freem(m); 1021 goto out; 1022 } 1023 #ifdef INET6 1024 isipv6 = 0; 1025 #endif 1026 break; 1027 #endif /* INET */ 1028 #ifdef INET6 1029 case AF_INET6: 1030 { 1031 struct sockaddr_in6 *sin6; 1032 1033 sin6 = (struct sockaddr_in6 *)nam; 1034 if (sin6->sin6_len != sizeof(*sin6)) { 1035 if (m) 1036 m_freem(m); 1037 error = EINVAL; 1038 goto out; 1039 } 1040 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1041 if (m) 1042 m_freem(m); 1043 error = EAFNOSUPPORT; 1044 goto out; 1045 } 1046 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1047 #ifdef INET 1048 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1049 error = EINVAL; 1050 if (m) 1051 m_freem(m); 1052 goto out; 1053 } 1054 if ((inp->inp_vflag & INP_IPV4) == 0) { 1055 error = EAFNOSUPPORT; 1056 if (m) 1057 m_freem(m); 1058 goto out; 1059 } 1060 restoreflags = true; 1061 inp->inp_vflag &= ~INP_IPV6; 1062 sinp = &sin; 1063 in6_sin6_2_sin(sinp, sin6); 1064 if (IN_MULTICAST( 1065 ntohl(sinp->sin_addr.s_addr))) { 1066 error = EAFNOSUPPORT; 1067 if (m) 1068 m_freem(m); 1069 goto out; 1070 } 1071 if ((error = prison_remote_ip4(td->td_ucred, 1072 &sinp->sin_addr))) { 1073 if (m) 1074 m_freem(m); 1075 goto out; 1076 } 1077 isipv6 = 0; 1078 #else /* !INET */ 1079 error = EAFNOSUPPORT; 1080 if (m) 1081 m_freem(m); 1082 goto out; 1083 #endif /* INET */ 1084 } else { 1085 if ((inp->inp_vflag & INP_IPV6) == 0) { 1086 if (m) 1087 m_freem(m); 1088 error = EAFNOSUPPORT; 1089 goto out; 1090 } 1091 restoreflags = true; 1092 inp->inp_vflag &= ~INP_IPV4; 1093 inp->inp_inc.inc_flags |= INC_ISIPV6; 1094 if ((error = prison_remote_ip6(td->td_ucred, 1095 &sin6->sin6_addr))) { 1096 if (m) 1097 m_freem(m); 1098 goto out; 1099 } 1100 isipv6 = 1; 1101 } 1102 break; 1103 } 1104 #endif /* INET6 */ 1105 default: 1106 if (m) 1107 m_freem(m); 1108 error = EAFNOSUPPORT; 1109 goto out; 1110 } 1111 } 1112 if (control) { 1113 /* TCP doesn't do control messages (rights, creds, etc) */ 1114 if (control->m_len) { 1115 m_freem(control); 1116 if (m) 1117 m_freem(m); 1118 error = EINVAL; 1119 goto out; 1120 } 1121 m_freem(control); /* empty control, just free it */ 1122 } 1123 if (!(flags & PRUS_OOB)) { 1124 sbappendstream(&so->so_snd, m, flags); 1125 if (nam && tp->t_state < TCPS_SYN_SENT) { 1126 /* 1127 * Do implied connect if not yet connected, 1128 * initialize window to default value, and 1129 * initialize maxseg using peer's cached MSS. 1130 */ 1131 #ifdef INET6 1132 if (isipv6) 1133 error = tcp6_connect(tp, nam, td); 1134 #endif /* INET6 */ 1135 #if defined(INET6) && defined(INET) 1136 else 1137 #endif 1138 #ifdef INET 1139 error = tcp_connect(tp, 1140 (struct sockaddr *)sinp, td); 1141 #endif 1142 /* 1143 * The bind operation in tcp_connect succeeded. We 1144 * no longer want to restore the flags if later 1145 * operations fail. 1146 */ 1147 if (error == 0 || inp->inp_lport != 0) 1148 restoreflags = false; 1149 1150 if (error) 1151 goto out; 1152 if (IS_FASTOPEN(tp->t_flags)) 1153 tcp_fastopen_connect(tp); 1154 else { 1155 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1156 tcp_mss(tp, -1); 1157 } 1158 } 1159 if (flags & PRUS_EOF) { 1160 /* 1161 * Close the send side of the connection after 1162 * the data is sent. 1163 */ 1164 socantsendmore(so); 1165 tcp_usrclosed(tp); 1166 } 1167 if (!(inp->inp_flags & INP_DROPPED) && 1168 !(flags & PRUS_NOTREADY)) { 1169 if (flags & PRUS_MORETOCOME) 1170 tp->t_flags |= TF_MORETOCOME; 1171 error = tp->t_fb->tfb_tcp_output(tp); 1172 if (flags & PRUS_MORETOCOME) 1173 tp->t_flags &= ~TF_MORETOCOME; 1174 } 1175 } else { 1176 /* 1177 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1178 */ 1179 SOCKBUF_LOCK(&so->so_snd); 1180 if (sbspace(&so->so_snd) < -512) { 1181 SOCKBUF_UNLOCK(&so->so_snd); 1182 m_freem(m); 1183 error = ENOBUFS; 1184 goto out; 1185 } 1186 /* 1187 * According to RFC961 (Assigned Protocols), 1188 * the urgent pointer points to the last octet 1189 * of urgent data. We continue, however, 1190 * to consider it to indicate the first octet 1191 * of data past the urgent section. 1192 * Otherwise, snd_up should be one lower. 1193 */ 1194 sbappendstream_locked(&so->so_snd, m, flags); 1195 SOCKBUF_UNLOCK(&so->so_snd); 1196 if (nam && tp->t_state < TCPS_SYN_SENT) { 1197 /* 1198 * Do implied connect if not yet connected, 1199 * initialize window to default value, and 1200 * initialize maxseg using peer's cached MSS. 1201 */ 1202 1203 /* 1204 * Not going to contemplate SYN|URG 1205 */ 1206 if (IS_FASTOPEN(tp->t_flags)) 1207 tp->t_flags &= ~TF_FASTOPEN; 1208 #ifdef INET6 1209 if (isipv6) 1210 error = tcp6_connect(tp, nam, td); 1211 #endif /* INET6 */ 1212 #if defined(INET6) && defined(INET) 1213 else 1214 #endif 1215 #ifdef INET 1216 error = tcp_connect(tp, 1217 (struct sockaddr *)sinp, td); 1218 #endif 1219 /* 1220 * The bind operation in tcp_connect succeeded. We 1221 * no longer want to restore the flags if later 1222 * operations fail. 1223 */ 1224 if (error == 0 || inp->inp_lport != 0) 1225 restoreflags = false; 1226 1227 if (error) 1228 goto out; 1229 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1230 tcp_mss(tp, -1); 1231 } 1232 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1233 if (!(flags & PRUS_NOTREADY)) { 1234 tp->t_flags |= TF_FORCEDATA; 1235 error = tp->t_fb->tfb_tcp_output(tp); 1236 tp->t_flags &= ~TF_FORCEDATA; 1237 } 1238 } 1239 TCP_LOG_EVENT(tp, NULL, 1240 &inp->inp_socket->so_rcv, 1241 &inp->inp_socket->so_snd, 1242 TCP_LOG_USERSEND, error, 1243 0, NULL, false); 1244 out: 1245 /* 1246 * If the request was unsuccessful and we changed flags, 1247 * restore the original flags. 1248 */ 1249 if (error != 0 && restoreflags) { 1250 inp->inp_vflag = vflagsav; 1251 inp->inp_inc.inc_flags = incflagsav; 1252 } 1253 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1254 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1255 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1256 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1257 INP_WUNLOCK(inp); 1258 NET_EPOCH_EXIT(et); 1259 return (error); 1260 } 1261 1262 static int 1263 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1264 { 1265 struct epoch_tracker et; 1266 struct inpcb *inp; 1267 struct tcpcb *tp; 1268 int error; 1269 1270 inp = sotoinpcb(so); 1271 INP_WLOCK(inp); 1272 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1273 INP_WUNLOCK(inp); 1274 mb_free_notready(m, count); 1275 return (ECONNRESET); 1276 } 1277 tp = intotcpcb(inp); 1278 1279 SOCKBUF_LOCK(&so->so_snd); 1280 error = sbready(&so->so_snd, m, count); 1281 SOCKBUF_UNLOCK(&so->so_snd); 1282 if (error == 0) { 1283 NET_EPOCH_ENTER(et); 1284 error = tp->t_fb->tfb_tcp_output(tp); 1285 NET_EPOCH_EXIT(et); 1286 } 1287 INP_WUNLOCK(inp); 1288 1289 return (error); 1290 } 1291 1292 /* 1293 * Abort the TCP. Drop the connection abruptly. 1294 */ 1295 static void 1296 tcp_usr_abort(struct socket *so) 1297 { 1298 struct inpcb *inp; 1299 struct tcpcb *tp = NULL; 1300 struct epoch_tracker et; 1301 TCPDEBUG0; 1302 1303 inp = sotoinpcb(so); 1304 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1305 1306 NET_EPOCH_ENTER(et); 1307 INP_WLOCK(inp); 1308 KASSERT(inp->inp_socket != NULL, 1309 ("tcp_usr_abort: inp_socket == NULL")); 1310 1311 /* 1312 * If we still have full TCP state, and we're not dropped, drop. 1313 */ 1314 if (!(inp->inp_flags & INP_TIMEWAIT) && 1315 !(inp->inp_flags & INP_DROPPED)) { 1316 tp = intotcpcb(inp); 1317 TCPDEBUG1(); 1318 tp = tcp_drop(tp, ECONNABORTED); 1319 if (tp == NULL) 1320 goto dropped; 1321 TCPDEBUG2(PRU_ABORT); 1322 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1323 } 1324 if (!(inp->inp_flags & INP_DROPPED)) { 1325 SOCK_LOCK(so); 1326 so->so_state |= SS_PROTOREF; 1327 SOCK_UNLOCK(so); 1328 inp->inp_flags |= INP_SOCKREF; 1329 } 1330 INP_WUNLOCK(inp); 1331 dropped: 1332 NET_EPOCH_EXIT(et); 1333 } 1334 1335 /* 1336 * TCP socket is closed. Start friendly disconnect. 1337 */ 1338 static void 1339 tcp_usr_close(struct socket *so) 1340 { 1341 struct inpcb *inp; 1342 struct tcpcb *tp = NULL; 1343 struct epoch_tracker et; 1344 TCPDEBUG0; 1345 1346 inp = sotoinpcb(so); 1347 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1348 1349 NET_EPOCH_ENTER(et); 1350 INP_WLOCK(inp); 1351 KASSERT(inp->inp_socket != NULL, 1352 ("tcp_usr_close: inp_socket == NULL")); 1353 1354 /* 1355 * If we still have full TCP state, and we're not dropped, initiate 1356 * a disconnect. 1357 */ 1358 if (!(inp->inp_flags & INP_TIMEWAIT) && 1359 !(inp->inp_flags & INP_DROPPED)) { 1360 tp = intotcpcb(inp); 1361 TCPDEBUG1(); 1362 tcp_disconnect(tp); 1363 TCPDEBUG2(PRU_CLOSE); 1364 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1365 } 1366 if (!(inp->inp_flags & INP_DROPPED)) { 1367 SOCK_LOCK(so); 1368 so->so_state |= SS_PROTOREF; 1369 SOCK_UNLOCK(so); 1370 inp->inp_flags |= INP_SOCKREF; 1371 } 1372 INP_WUNLOCK(inp); 1373 NET_EPOCH_EXIT(et); 1374 } 1375 1376 static int 1377 tcp_pru_options_support(struct tcpcb *tp, int flags) 1378 { 1379 /* 1380 * If the specific TCP stack has a pru_options 1381 * specified then it does not always support 1382 * all the PRU_XX options and we must ask it. 1383 * If the function is not specified then all 1384 * of the PRU_XX options are supported. 1385 */ 1386 int ret = 0; 1387 1388 if (tp->t_fb->tfb_pru_options) { 1389 ret = (*tp->t_fb->tfb_pru_options)(tp, flags); 1390 } 1391 return (ret); 1392 } 1393 1394 /* 1395 * Receive out-of-band data. 1396 */ 1397 static int 1398 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1399 { 1400 int error = 0; 1401 struct inpcb *inp; 1402 struct tcpcb *tp = NULL; 1403 1404 TCPDEBUG0; 1405 inp = sotoinpcb(so); 1406 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1407 INP_WLOCK(inp); 1408 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1409 error = ECONNRESET; 1410 goto out; 1411 } 1412 tp = intotcpcb(inp); 1413 error = tcp_pru_options_support(tp, PRUS_OOB); 1414 if (error) { 1415 goto out; 1416 } 1417 TCPDEBUG1(); 1418 if ((so->so_oobmark == 0 && 1419 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1420 so->so_options & SO_OOBINLINE || 1421 tp->t_oobflags & TCPOOB_HADDATA) { 1422 error = EINVAL; 1423 goto out; 1424 } 1425 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1426 error = EWOULDBLOCK; 1427 goto out; 1428 } 1429 m->m_len = 1; 1430 *mtod(m, caddr_t) = tp->t_iobc; 1431 if ((flags & MSG_PEEK) == 0) 1432 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1433 1434 out: 1435 TCPDEBUG2(PRU_RCVOOB); 1436 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1437 INP_WUNLOCK(inp); 1438 return (error); 1439 } 1440 1441 #ifdef INET 1442 struct pr_usrreqs tcp_usrreqs = { 1443 .pru_abort = tcp_usr_abort, 1444 .pru_accept = tcp_usr_accept, 1445 .pru_attach = tcp_usr_attach, 1446 .pru_bind = tcp_usr_bind, 1447 .pru_connect = tcp_usr_connect, 1448 .pru_control = in_control, 1449 .pru_detach = tcp_usr_detach, 1450 .pru_disconnect = tcp_usr_disconnect, 1451 .pru_listen = tcp_usr_listen, 1452 .pru_peeraddr = in_getpeeraddr, 1453 .pru_rcvd = tcp_usr_rcvd, 1454 .pru_rcvoob = tcp_usr_rcvoob, 1455 .pru_send = tcp_usr_send, 1456 .pru_ready = tcp_usr_ready, 1457 .pru_shutdown = tcp_usr_shutdown, 1458 .pru_sockaddr = in_getsockaddr, 1459 .pru_sosetlabel = in_pcbsosetlabel, 1460 .pru_close = tcp_usr_close, 1461 }; 1462 #endif /* INET */ 1463 1464 #ifdef INET6 1465 struct pr_usrreqs tcp6_usrreqs = { 1466 .pru_abort = tcp_usr_abort, 1467 .pru_accept = tcp6_usr_accept, 1468 .pru_attach = tcp_usr_attach, 1469 .pru_bind = tcp6_usr_bind, 1470 .pru_connect = tcp6_usr_connect, 1471 .pru_control = in6_control, 1472 .pru_detach = tcp_usr_detach, 1473 .pru_disconnect = tcp_usr_disconnect, 1474 .pru_listen = tcp6_usr_listen, 1475 .pru_peeraddr = in6_mapped_peeraddr, 1476 .pru_rcvd = tcp_usr_rcvd, 1477 .pru_rcvoob = tcp_usr_rcvoob, 1478 .pru_send = tcp_usr_send, 1479 .pru_ready = tcp_usr_ready, 1480 .pru_shutdown = tcp_usr_shutdown, 1481 .pru_sockaddr = in6_mapped_sockaddr, 1482 .pru_sosetlabel = in_pcbsosetlabel, 1483 .pru_close = tcp_usr_close, 1484 }; 1485 #endif /* INET6 */ 1486 1487 #ifdef INET 1488 /* 1489 * Common subroutine to open a TCP connection to remote host specified 1490 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1491 * port number if needed. Call in_pcbconnect_setup to do the routing and 1492 * to choose a local host address (interface). If there is an existing 1493 * incarnation of the same connection in TIME-WAIT state and if the remote 1494 * host was sending CC options and if the connection duration was < MSL, then 1495 * truncate the previous TIME-WAIT state and proceed. 1496 * Initialize connection parameters and enter SYN-SENT state. 1497 */ 1498 static int 1499 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1500 { 1501 struct inpcb *inp = tp->t_inpcb, *oinp; 1502 struct socket *so = inp->inp_socket; 1503 struct in_addr laddr; 1504 u_short lport; 1505 int error; 1506 1507 NET_EPOCH_ASSERT(); 1508 INP_WLOCK_ASSERT(inp); 1509 INP_HASH_WLOCK(&V_tcbinfo); 1510 1511 if (inp->inp_lport == 0) { 1512 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1513 if (error) 1514 goto out; 1515 } 1516 1517 /* 1518 * Cannot simply call in_pcbconnect, because there might be an 1519 * earlier incarnation of this same connection still in 1520 * TIME_WAIT state, creating an ADDRINUSE error. 1521 */ 1522 laddr = inp->inp_laddr; 1523 lport = inp->inp_lport; 1524 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1525 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1526 if (error && oinp == NULL) 1527 goto out; 1528 if (oinp) { 1529 error = EADDRINUSE; 1530 goto out; 1531 } 1532 inp->inp_laddr = laddr; 1533 in_pcbrehash(inp); 1534 INP_HASH_WUNLOCK(&V_tcbinfo); 1535 1536 /* 1537 * Compute window scaling to request: 1538 * Scale to fit into sweet spot. See tcp_syncache.c. 1539 * XXX: This should move to tcp_output(). 1540 */ 1541 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1542 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1543 tp->request_r_scale++; 1544 1545 soisconnecting(so); 1546 TCPSTAT_INC(tcps_connattempt); 1547 tcp_state_change(tp, TCPS_SYN_SENT); 1548 tp->iss = tcp_new_isn(&inp->inp_inc); 1549 if (tp->t_flags & TF_REQ_TSTMP) 1550 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1551 tcp_sendseqinit(tp); 1552 1553 return 0; 1554 1555 out: 1556 INP_HASH_WUNLOCK(&V_tcbinfo); 1557 return (error); 1558 } 1559 #endif /* INET */ 1560 1561 #ifdef INET6 1562 static int 1563 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1564 { 1565 struct inpcb *inp = tp->t_inpcb; 1566 int error; 1567 1568 INP_WLOCK_ASSERT(inp); 1569 INP_HASH_WLOCK(&V_tcbinfo); 1570 1571 if (inp->inp_lport == 0) { 1572 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1573 if (error) 1574 goto out; 1575 } 1576 error = in6_pcbconnect(inp, nam, td->td_ucred); 1577 if (error != 0) 1578 goto out; 1579 INP_HASH_WUNLOCK(&V_tcbinfo); 1580 1581 /* Compute window scaling to request. */ 1582 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1583 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1584 tp->request_r_scale++; 1585 1586 soisconnecting(inp->inp_socket); 1587 TCPSTAT_INC(tcps_connattempt); 1588 tcp_state_change(tp, TCPS_SYN_SENT); 1589 tp->iss = tcp_new_isn(&inp->inp_inc); 1590 if (tp->t_flags & TF_REQ_TSTMP) 1591 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1592 tcp_sendseqinit(tp); 1593 1594 return 0; 1595 1596 out: 1597 INP_HASH_WUNLOCK(&V_tcbinfo); 1598 return error; 1599 } 1600 #endif /* INET6 */ 1601 1602 /* 1603 * Export TCP internal state information via a struct tcp_info, based on the 1604 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1605 * (TCP state machine, etc). We export all information using FreeBSD-native 1606 * constants -- for example, the numeric values for tcpi_state will differ 1607 * from Linux. 1608 */ 1609 static void 1610 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1611 { 1612 1613 INP_WLOCK_ASSERT(tp->t_inpcb); 1614 bzero(ti, sizeof(*ti)); 1615 1616 ti->tcpi_state = tp->t_state; 1617 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1618 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1619 if (tp->t_flags & TF_SACK_PERMIT) 1620 ti->tcpi_options |= TCPI_OPT_SACK; 1621 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1622 ti->tcpi_options |= TCPI_OPT_WSCALE; 1623 ti->tcpi_snd_wscale = tp->snd_scale; 1624 ti->tcpi_rcv_wscale = tp->rcv_scale; 1625 } 1626 if (tp->t_flags2 & TF2_ECN_PERMIT) 1627 ti->tcpi_options |= TCPI_OPT_ECN; 1628 1629 ti->tcpi_rto = tp->t_rxtcur * tick; 1630 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1631 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1632 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1633 1634 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1635 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1636 1637 /* 1638 * FreeBSD-specific extension fields for tcp_info. 1639 */ 1640 ti->tcpi_rcv_space = tp->rcv_wnd; 1641 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1642 ti->tcpi_snd_wnd = tp->snd_wnd; 1643 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1644 ti->tcpi_snd_nxt = tp->snd_nxt; 1645 ti->tcpi_snd_mss = tp->t_maxseg; 1646 ti->tcpi_rcv_mss = tp->t_maxseg; 1647 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1648 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1649 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1650 #ifdef TCP_OFFLOAD 1651 if (tp->t_flags & TF_TOE) { 1652 ti->tcpi_options |= TCPI_OPT_TOE; 1653 tcp_offload_tcp_info(tp, ti); 1654 } 1655 #endif 1656 } 1657 1658 /* 1659 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1660 * socket option arguments. When it re-acquires the lock after the copy, it 1661 * has to revalidate that the connection is still valid for the socket 1662 * option. 1663 */ 1664 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1665 INP_WLOCK(inp); \ 1666 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1667 INP_WUNLOCK(inp); \ 1668 cleanup; \ 1669 return (ECONNRESET); \ 1670 } \ 1671 tp = intotcpcb(inp); \ 1672 } while(0) 1673 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1674 1675 int 1676 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1677 { 1678 int error; 1679 struct inpcb *inp; 1680 struct tcpcb *tp; 1681 struct tcp_function_block *blk; 1682 struct tcp_function_set fsn; 1683 1684 error = 0; 1685 inp = sotoinpcb(so); 1686 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1687 if (sopt->sopt_level != IPPROTO_TCP) { 1688 #ifdef INET6 1689 if (inp->inp_vflag & INP_IPV6PROTO) { 1690 error = ip6_ctloutput(so, sopt); 1691 /* 1692 * In case of the IPV6_USE_MIN_MTU socket option, 1693 * the INC_IPV6MINMTU flag to announce a corresponding 1694 * MSS during the initial handshake. 1695 * If the TCP connection is not in the front states, 1696 * just reduce the MSS being used. 1697 * This avoids the sending of TCP segments which will 1698 * be fragmented at the IPv6 layer. 1699 */ 1700 if ((error == 0) && 1701 (sopt->sopt_dir == SOPT_SET) && 1702 (sopt->sopt_level == IPPROTO_IPV6) && 1703 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1704 INP_WLOCK(inp); 1705 if ((inp->inp_flags & 1706 (INP_TIMEWAIT | INP_DROPPED))) { 1707 INP_WUNLOCK(inp); 1708 return (ECONNRESET); 1709 } 1710 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1711 tp = intotcpcb(inp); 1712 if ((tp->t_state >= TCPS_SYN_SENT) && 1713 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1714 struct ip6_pktopts *opt; 1715 1716 opt = inp->in6p_outputopts; 1717 if ((opt != NULL) && 1718 (opt->ip6po_minmtu == 1719 IP6PO_MINMTU_ALL)) { 1720 if (tp->t_maxseg > TCP6_MSS) { 1721 tp->t_maxseg = TCP6_MSS; 1722 } 1723 } 1724 } 1725 INP_WUNLOCK(inp); 1726 } 1727 } 1728 #endif /* INET6 */ 1729 #if defined(INET6) && defined(INET) 1730 else 1731 #endif 1732 #ifdef INET 1733 { 1734 error = ip_ctloutput(so, sopt); 1735 } 1736 #endif 1737 return (error); 1738 } 1739 INP_WLOCK(inp); 1740 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1741 INP_WUNLOCK(inp); 1742 return (ECONNRESET); 1743 } 1744 tp = intotcpcb(inp); 1745 /* 1746 * Protect the TCP option TCP_FUNCTION_BLK so 1747 * that a sub-function can *never* overwrite this. 1748 */ 1749 if ((sopt->sopt_dir == SOPT_SET) && 1750 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1751 INP_WUNLOCK(inp); 1752 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1753 sizeof fsn); 1754 if (error) 1755 return (error); 1756 INP_WLOCK_RECHECK(inp); 1757 blk = find_and_ref_tcp_functions(&fsn); 1758 if (blk == NULL) { 1759 INP_WUNLOCK(inp); 1760 return (ENOENT); 1761 } 1762 if (tp->t_fb == blk) { 1763 /* You already have this */ 1764 refcount_release(&blk->tfb_refcnt); 1765 INP_WUNLOCK(inp); 1766 return (0); 1767 } 1768 if (tp->t_state != TCPS_CLOSED) { 1769 /* 1770 * The user has advanced the state 1771 * past the initial point, we may not 1772 * be able to switch. 1773 */ 1774 if (blk->tfb_tcp_handoff_ok != NULL) { 1775 /* 1776 * Does the stack provide a 1777 * query mechanism, if so it may 1778 * still be possible? 1779 */ 1780 error = (*blk->tfb_tcp_handoff_ok)(tp); 1781 } else 1782 error = EINVAL; 1783 if (error) { 1784 refcount_release(&blk->tfb_refcnt); 1785 INP_WUNLOCK(inp); 1786 return(error); 1787 } 1788 } 1789 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1790 refcount_release(&blk->tfb_refcnt); 1791 INP_WUNLOCK(inp); 1792 return (ENOENT); 1793 } 1794 /* 1795 * Release the old refcnt, the 1796 * lookup acquired a ref on the 1797 * new one already. 1798 */ 1799 if (tp->t_fb->tfb_tcp_fb_fini) { 1800 /* 1801 * Tell the stack to cleanup with 0 i.e. 1802 * the tcb is not going away. 1803 */ 1804 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1805 } 1806 #ifdef TCPHPTS 1807 /* Assure that we are not on any hpts */ 1808 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1809 #endif 1810 if (blk->tfb_tcp_fb_init) { 1811 error = (*blk->tfb_tcp_fb_init)(tp); 1812 if (error) { 1813 refcount_release(&blk->tfb_refcnt); 1814 if (tp->t_fb->tfb_tcp_fb_init) { 1815 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1816 /* Fall back failed, drop the connection */ 1817 INP_WUNLOCK(inp); 1818 soabort(so); 1819 return(error); 1820 } 1821 } 1822 goto err_out; 1823 } 1824 } 1825 refcount_release(&tp->t_fb->tfb_refcnt); 1826 tp->t_fb = blk; 1827 #ifdef TCP_OFFLOAD 1828 if (tp->t_flags & TF_TOE) { 1829 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1830 sopt->sopt_name); 1831 } 1832 #endif 1833 err_out: 1834 INP_WUNLOCK(inp); 1835 return (error); 1836 } else if ((sopt->sopt_dir == SOPT_GET) && 1837 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1838 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1839 TCP_FUNCTION_NAME_LEN_MAX); 1840 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1841 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1842 INP_WUNLOCK(inp); 1843 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1844 return (error); 1845 } 1846 /* Pass in the INP locked, called must unlock it */ 1847 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1848 } 1849 1850 /* 1851 * If this assert becomes untrue, we need to change the size of the buf 1852 * variable in tcp_default_ctloutput(). 1853 */ 1854 #ifdef CTASSERT 1855 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1856 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1857 #endif 1858 1859 #ifdef KERN_TLS 1860 static int 1861 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls) 1862 { 1863 struct tls_enable_v0 tls_v0; 1864 int error; 1865 1866 if (sopt->sopt_valsize == sizeof(tls_v0)) { 1867 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0), 1868 sizeof(tls_v0)); 1869 if (error) 1870 return (error); 1871 memset(tls, 0, sizeof(*tls)); 1872 tls->cipher_key = tls_v0.cipher_key; 1873 tls->iv = tls_v0.iv; 1874 tls->auth_key = tls_v0.auth_key; 1875 tls->cipher_algorithm = tls_v0.cipher_algorithm; 1876 tls->cipher_key_len = tls_v0.cipher_key_len; 1877 tls->iv_len = tls_v0.iv_len; 1878 tls->auth_algorithm = tls_v0.auth_algorithm; 1879 tls->auth_key_len = tls_v0.auth_key_len; 1880 tls->flags = tls_v0.flags; 1881 tls->tls_vmajor = tls_v0.tls_vmajor; 1882 tls->tls_vminor = tls_v0.tls_vminor; 1883 return (0); 1884 } 1885 1886 return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls))); 1887 } 1888 #endif 1889 1890 int 1891 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1892 { 1893 int error, opt, optval; 1894 u_int ui; 1895 struct tcp_info ti; 1896 #ifdef KERN_TLS 1897 struct tls_enable tls; 1898 #endif 1899 struct cc_algo *algo; 1900 char *pbuf, buf[TCP_LOG_ID_LEN]; 1901 #ifdef STATS 1902 struct statsblob *sbp; 1903 #endif 1904 size_t len; 1905 1906 /* 1907 * For TCP_CCALGOOPT forward the control to CC module, for both 1908 * SOPT_SET and SOPT_GET. 1909 */ 1910 switch (sopt->sopt_name) { 1911 case TCP_CCALGOOPT: 1912 INP_WUNLOCK(inp); 1913 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 1914 return (EINVAL); 1915 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1916 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1917 sopt->sopt_valsize); 1918 if (error) { 1919 free(pbuf, M_TEMP); 1920 return (error); 1921 } 1922 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1923 if (CC_ALGO(tp)->ctl_output != NULL) 1924 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1925 else 1926 error = ENOENT; 1927 INP_WUNLOCK(inp); 1928 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1929 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1930 free(pbuf, M_TEMP); 1931 return (error); 1932 } 1933 1934 switch (sopt->sopt_dir) { 1935 case SOPT_SET: 1936 switch (sopt->sopt_name) { 1937 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1938 case TCP_MD5SIG: 1939 if (!TCPMD5_ENABLED()) { 1940 INP_WUNLOCK(inp); 1941 return (ENOPROTOOPT); 1942 } 1943 error = TCPMD5_PCBCTL(inp, sopt); 1944 if (error) 1945 return (error); 1946 goto unlock_and_done; 1947 #endif /* IPSEC */ 1948 1949 case TCP_NODELAY: 1950 case TCP_NOOPT: 1951 INP_WUNLOCK(inp); 1952 error = sooptcopyin(sopt, &optval, sizeof optval, 1953 sizeof optval); 1954 if (error) 1955 return (error); 1956 1957 INP_WLOCK_RECHECK(inp); 1958 switch (sopt->sopt_name) { 1959 case TCP_NODELAY: 1960 opt = TF_NODELAY; 1961 break; 1962 case TCP_NOOPT: 1963 opt = TF_NOOPT; 1964 break; 1965 default: 1966 opt = 0; /* dead code to fool gcc */ 1967 break; 1968 } 1969 1970 if (optval) 1971 tp->t_flags |= opt; 1972 else 1973 tp->t_flags &= ~opt; 1974 unlock_and_done: 1975 #ifdef TCP_OFFLOAD 1976 if (tp->t_flags & TF_TOE) { 1977 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1978 sopt->sopt_name); 1979 } 1980 #endif 1981 INP_WUNLOCK(inp); 1982 break; 1983 1984 case TCP_NOPUSH: 1985 INP_WUNLOCK(inp); 1986 error = sooptcopyin(sopt, &optval, sizeof optval, 1987 sizeof optval); 1988 if (error) 1989 return (error); 1990 1991 INP_WLOCK_RECHECK(inp); 1992 if (optval) 1993 tp->t_flags |= TF_NOPUSH; 1994 else if (tp->t_flags & TF_NOPUSH) { 1995 tp->t_flags &= ~TF_NOPUSH; 1996 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 1997 struct epoch_tracker et; 1998 1999 NET_EPOCH_ENTER(et); 2000 error = tp->t_fb->tfb_tcp_output(tp); 2001 NET_EPOCH_EXIT(et); 2002 } 2003 } 2004 goto unlock_and_done; 2005 2006 case TCP_MAXSEG: 2007 INP_WUNLOCK(inp); 2008 error = sooptcopyin(sopt, &optval, sizeof optval, 2009 sizeof optval); 2010 if (error) 2011 return (error); 2012 2013 INP_WLOCK_RECHECK(inp); 2014 if (optval > 0 && optval <= tp->t_maxseg && 2015 optval + 40 >= V_tcp_minmss) 2016 tp->t_maxseg = optval; 2017 else 2018 error = EINVAL; 2019 goto unlock_and_done; 2020 2021 case TCP_INFO: 2022 INP_WUNLOCK(inp); 2023 error = EINVAL; 2024 break; 2025 2026 case TCP_STATS: 2027 INP_WUNLOCK(inp); 2028 #ifdef STATS 2029 error = sooptcopyin(sopt, &optval, sizeof optval, 2030 sizeof optval); 2031 if (error) 2032 return (error); 2033 2034 if (optval > 0) 2035 sbp = stats_blob_alloc( 2036 V_tcp_perconn_stats_dflt_tpl, 0); 2037 else 2038 sbp = NULL; 2039 2040 INP_WLOCK_RECHECK(inp); 2041 if ((tp->t_stats != NULL && sbp == NULL) || 2042 (tp->t_stats == NULL && sbp != NULL)) { 2043 struct statsblob *t = tp->t_stats; 2044 tp->t_stats = sbp; 2045 sbp = t; 2046 } 2047 INP_WUNLOCK(inp); 2048 2049 stats_blob_destroy(sbp); 2050 #else 2051 return (EOPNOTSUPP); 2052 #endif /* !STATS */ 2053 break; 2054 2055 case TCP_CONGESTION: 2056 INP_WUNLOCK(inp); 2057 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 2058 if (error) 2059 break; 2060 buf[sopt->sopt_valsize] = '\0'; 2061 INP_WLOCK_RECHECK(inp); 2062 CC_LIST_RLOCK(); 2063 STAILQ_FOREACH(algo, &cc_list, entries) 2064 if (strncmp(buf, algo->name, 2065 TCP_CA_NAME_MAX) == 0) 2066 break; 2067 CC_LIST_RUNLOCK(); 2068 if (algo == NULL) { 2069 INP_WUNLOCK(inp); 2070 error = EINVAL; 2071 break; 2072 } 2073 /* 2074 * We hold a write lock over the tcb so it's safe to 2075 * do these things without ordering concerns. 2076 */ 2077 if (CC_ALGO(tp)->cb_destroy != NULL) 2078 CC_ALGO(tp)->cb_destroy(tp->ccv); 2079 CC_DATA(tp) = NULL; 2080 CC_ALGO(tp) = algo; 2081 /* 2082 * If something goes pear shaped initialising the new 2083 * algo, fall back to newreno (which does not 2084 * require initialisation). 2085 */ 2086 if (algo->cb_init != NULL && 2087 algo->cb_init(tp->ccv) != 0) { 2088 CC_ALGO(tp) = &newreno_cc_algo; 2089 /* 2090 * The only reason init should fail is 2091 * because of malloc. 2092 */ 2093 error = ENOMEM; 2094 } 2095 INP_WUNLOCK(inp); 2096 break; 2097 2098 #ifdef KERN_TLS 2099 case TCP_TXTLS_ENABLE: 2100 INP_WUNLOCK(inp); 2101 error = copyin_tls_enable(sopt, &tls); 2102 if (error) 2103 break; 2104 error = ktls_enable_tx(so, &tls); 2105 break; 2106 case TCP_TXTLS_MODE: 2107 INP_WUNLOCK(inp); 2108 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2109 if (error) 2110 return (error); 2111 2112 INP_WLOCK_RECHECK(inp); 2113 error = ktls_set_tx_mode(so, ui); 2114 INP_WUNLOCK(inp); 2115 break; 2116 case TCP_RXTLS_ENABLE: 2117 INP_WUNLOCK(inp); 2118 error = sooptcopyin(sopt, &tls, sizeof(tls), 2119 sizeof(tls)); 2120 if (error) 2121 break; 2122 error = ktls_enable_rx(so, &tls); 2123 break; 2124 #endif 2125 2126 case TCP_KEEPIDLE: 2127 case TCP_KEEPINTVL: 2128 case TCP_KEEPINIT: 2129 INP_WUNLOCK(inp); 2130 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2131 if (error) 2132 return (error); 2133 2134 if (ui > (UINT_MAX / hz)) { 2135 error = EINVAL; 2136 break; 2137 } 2138 ui *= hz; 2139 2140 INP_WLOCK_RECHECK(inp); 2141 switch (sopt->sopt_name) { 2142 case TCP_KEEPIDLE: 2143 tp->t_keepidle = ui; 2144 /* 2145 * XXX: better check current remaining 2146 * timeout and "merge" it with new value. 2147 */ 2148 if ((tp->t_state > TCPS_LISTEN) && 2149 (tp->t_state <= TCPS_CLOSING)) 2150 tcp_timer_activate(tp, TT_KEEP, 2151 TP_KEEPIDLE(tp)); 2152 break; 2153 case TCP_KEEPINTVL: 2154 tp->t_keepintvl = ui; 2155 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2156 (TP_MAXIDLE(tp) > 0)) 2157 tcp_timer_activate(tp, TT_2MSL, 2158 TP_MAXIDLE(tp)); 2159 break; 2160 case TCP_KEEPINIT: 2161 tp->t_keepinit = ui; 2162 if (tp->t_state == TCPS_SYN_RECEIVED || 2163 tp->t_state == TCPS_SYN_SENT) 2164 tcp_timer_activate(tp, TT_KEEP, 2165 TP_KEEPINIT(tp)); 2166 break; 2167 } 2168 goto unlock_and_done; 2169 2170 case TCP_KEEPCNT: 2171 INP_WUNLOCK(inp); 2172 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2173 if (error) 2174 return (error); 2175 2176 INP_WLOCK_RECHECK(inp); 2177 tp->t_keepcnt = ui; 2178 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2179 (TP_MAXIDLE(tp) > 0)) 2180 tcp_timer_activate(tp, TT_2MSL, 2181 TP_MAXIDLE(tp)); 2182 goto unlock_and_done; 2183 2184 #ifdef TCPPCAP 2185 case TCP_PCAP_OUT: 2186 case TCP_PCAP_IN: 2187 INP_WUNLOCK(inp); 2188 error = sooptcopyin(sopt, &optval, sizeof optval, 2189 sizeof optval); 2190 if (error) 2191 return (error); 2192 2193 INP_WLOCK_RECHECK(inp); 2194 if (optval >= 0) 2195 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 2196 &(tp->t_outpkts) : &(tp->t_inpkts), 2197 optval); 2198 else 2199 error = EINVAL; 2200 goto unlock_and_done; 2201 #endif 2202 2203 case TCP_FASTOPEN: { 2204 struct tcp_fastopen tfo_optval; 2205 2206 INP_WUNLOCK(inp); 2207 if (!V_tcp_fastopen_client_enable && 2208 !V_tcp_fastopen_server_enable) 2209 return (EPERM); 2210 2211 error = sooptcopyin(sopt, &tfo_optval, 2212 sizeof(tfo_optval), sizeof(int)); 2213 if (error) 2214 return (error); 2215 2216 INP_WLOCK_RECHECK(inp); 2217 if (tfo_optval.enable) { 2218 if (tp->t_state == TCPS_LISTEN) { 2219 if (!V_tcp_fastopen_server_enable) { 2220 error = EPERM; 2221 goto unlock_and_done; 2222 } 2223 2224 tp->t_flags |= TF_FASTOPEN; 2225 if (tp->t_tfo_pending == NULL) 2226 tp->t_tfo_pending = 2227 tcp_fastopen_alloc_counter(); 2228 } else { 2229 /* 2230 * If a pre-shared key was provided, 2231 * stash it in the client cookie 2232 * field of the tcpcb for use during 2233 * connect. 2234 */ 2235 if (sopt->sopt_valsize == 2236 sizeof(tfo_optval)) { 2237 memcpy(tp->t_tfo_cookie.client, 2238 tfo_optval.psk, 2239 TCP_FASTOPEN_PSK_LEN); 2240 tp->t_tfo_client_cookie_len = 2241 TCP_FASTOPEN_PSK_LEN; 2242 } 2243 tp->t_flags |= TF_FASTOPEN; 2244 } 2245 } else 2246 tp->t_flags &= ~TF_FASTOPEN; 2247 goto unlock_and_done; 2248 } 2249 2250 #ifdef TCP_BLACKBOX 2251 case TCP_LOG: 2252 INP_WUNLOCK(inp); 2253 error = sooptcopyin(sopt, &optval, sizeof optval, 2254 sizeof optval); 2255 if (error) 2256 return (error); 2257 2258 INP_WLOCK_RECHECK(inp); 2259 error = tcp_log_state_change(tp, optval); 2260 goto unlock_and_done; 2261 2262 case TCP_LOGBUF: 2263 INP_WUNLOCK(inp); 2264 error = EINVAL; 2265 break; 2266 2267 case TCP_LOGID: 2268 INP_WUNLOCK(inp); 2269 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2270 if (error) 2271 break; 2272 buf[sopt->sopt_valsize] = '\0'; 2273 INP_WLOCK_RECHECK(inp); 2274 error = tcp_log_set_id(tp, buf); 2275 /* tcp_log_set_id() unlocks the INP. */ 2276 break; 2277 2278 case TCP_LOGDUMP: 2279 case TCP_LOGDUMPID: 2280 INP_WUNLOCK(inp); 2281 error = 2282 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2283 if (error) 2284 break; 2285 buf[sopt->sopt_valsize] = '\0'; 2286 INP_WLOCK_RECHECK(inp); 2287 if (sopt->sopt_name == TCP_LOGDUMP) { 2288 error = tcp_log_dump_tp_logbuf(tp, buf, 2289 M_WAITOK, true); 2290 INP_WUNLOCK(inp); 2291 } else { 2292 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2293 /* 2294 * tcp_log_dump_tp_bucket_logbufs() drops the 2295 * INP lock. 2296 */ 2297 } 2298 break; 2299 #endif 2300 2301 default: 2302 INP_WUNLOCK(inp); 2303 error = ENOPROTOOPT; 2304 break; 2305 } 2306 break; 2307 2308 case SOPT_GET: 2309 tp = intotcpcb(inp); 2310 switch (sopt->sopt_name) { 2311 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2312 case TCP_MD5SIG: 2313 if (!TCPMD5_ENABLED()) { 2314 INP_WUNLOCK(inp); 2315 return (ENOPROTOOPT); 2316 } 2317 error = TCPMD5_PCBCTL(inp, sopt); 2318 break; 2319 #endif 2320 2321 case TCP_NODELAY: 2322 optval = tp->t_flags & TF_NODELAY; 2323 INP_WUNLOCK(inp); 2324 error = sooptcopyout(sopt, &optval, sizeof optval); 2325 break; 2326 case TCP_MAXSEG: 2327 optval = tp->t_maxseg; 2328 INP_WUNLOCK(inp); 2329 error = sooptcopyout(sopt, &optval, sizeof optval); 2330 break; 2331 case TCP_NOOPT: 2332 optval = tp->t_flags & TF_NOOPT; 2333 INP_WUNLOCK(inp); 2334 error = sooptcopyout(sopt, &optval, sizeof optval); 2335 break; 2336 case TCP_NOPUSH: 2337 optval = tp->t_flags & TF_NOPUSH; 2338 INP_WUNLOCK(inp); 2339 error = sooptcopyout(sopt, &optval, sizeof optval); 2340 break; 2341 case TCP_INFO: 2342 tcp_fill_info(tp, &ti); 2343 INP_WUNLOCK(inp); 2344 error = sooptcopyout(sopt, &ti, sizeof ti); 2345 break; 2346 case TCP_STATS: 2347 { 2348 #ifdef STATS 2349 int nheld; 2350 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2351 2352 error = 0; 2353 socklen_t outsbsz = sopt->sopt_valsize; 2354 if (tp->t_stats == NULL) 2355 error = ENOENT; 2356 else if (outsbsz >= tp->t_stats->cursz) 2357 outsbsz = tp->t_stats->cursz; 2358 else if (outsbsz >= sizeof(struct statsblob)) 2359 outsbsz = sizeof(struct statsblob); 2360 else 2361 error = EINVAL; 2362 INP_WUNLOCK(inp); 2363 if (error) 2364 break; 2365 2366 sbp = sopt->sopt_val; 2367 nheld = atop(round_page(((vm_offset_t)sbp) + 2368 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2369 vm_page_t ma[nheld]; 2370 if (vm_fault_quick_hold_pages( 2371 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2372 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2373 nheld) < 0) { 2374 error = EFAULT; 2375 break; 2376 } 2377 2378 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2379 SIZEOF_MEMBER(struct statsblob, flags)))) 2380 goto unhold; 2381 2382 INP_WLOCK_RECHECK(inp); 2383 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2384 sbflags | SB_CLONE_USRDSTNOFAULT); 2385 INP_WUNLOCK(inp); 2386 sopt->sopt_valsize = outsbsz; 2387 unhold: 2388 vm_page_unhold_pages(ma, nheld); 2389 #else 2390 INP_WUNLOCK(inp); 2391 error = EOPNOTSUPP; 2392 #endif /* !STATS */ 2393 break; 2394 } 2395 case TCP_CONGESTION: 2396 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2397 INP_WUNLOCK(inp); 2398 error = sooptcopyout(sopt, buf, len + 1); 2399 break; 2400 case TCP_KEEPIDLE: 2401 case TCP_KEEPINTVL: 2402 case TCP_KEEPINIT: 2403 case TCP_KEEPCNT: 2404 switch (sopt->sopt_name) { 2405 case TCP_KEEPIDLE: 2406 ui = TP_KEEPIDLE(tp) / hz; 2407 break; 2408 case TCP_KEEPINTVL: 2409 ui = TP_KEEPINTVL(tp) / hz; 2410 break; 2411 case TCP_KEEPINIT: 2412 ui = TP_KEEPINIT(tp) / hz; 2413 break; 2414 case TCP_KEEPCNT: 2415 ui = TP_KEEPCNT(tp); 2416 break; 2417 } 2418 INP_WUNLOCK(inp); 2419 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2420 break; 2421 #ifdef TCPPCAP 2422 case TCP_PCAP_OUT: 2423 case TCP_PCAP_IN: 2424 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2425 &(tp->t_outpkts) : &(tp->t_inpkts)); 2426 INP_WUNLOCK(inp); 2427 error = sooptcopyout(sopt, &optval, sizeof optval); 2428 break; 2429 #endif 2430 case TCP_FASTOPEN: 2431 optval = tp->t_flags & TF_FASTOPEN; 2432 INP_WUNLOCK(inp); 2433 error = sooptcopyout(sopt, &optval, sizeof optval); 2434 break; 2435 #ifdef TCP_BLACKBOX 2436 case TCP_LOG: 2437 optval = tp->t_logstate; 2438 INP_WUNLOCK(inp); 2439 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2440 break; 2441 case TCP_LOGBUF: 2442 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2443 error = tcp_log_getlogbuf(sopt, tp); 2444 break; 2445 case TCP_LOGID: 2446 len = tcp_log_get_id(tp, buf); 2447 INP_WUNLOCK(inp); 2448 error = sooptcopyout(sopt, buf, len + 1); 2449 break; 2450 case TCP_LOGDUMP: 2451 case TCP_LOGDUMPID: 2452 INP_WUNLOCK(inp); 2453 error = EINVAL; 2454 break; 2455 #endif 2456 #ifdef KERN_TLS 2457 case TCP_TXTLS_MODE: 2458 optval = ktls_get_tx_mode(so); 2459 INP_WUNLOCK(inp); 2460 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2461 break; 2462 case TCP_RXTLS_MODE: 2463 optval = ktls_get_rx_mode(so); 2464 INP_WUNLOCK(inp); 2465 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2466 break; 2467 #endif 2468 default: 2469 INP_WUNLOCK(inp); 2470 error = ENOPROTOOPT; 2471 break; 2472 } 2473 break; 2474 } 2475 return (error); 2476 } 2477 #undef INP_WLOCK_RECHECK 2478 #undef INP_WLOCK_RECHECK_CLEANUP 2479 2480 /* 2481 * Initiate (or continue) disconnect. 2482 * If embryonic state, just send reset (once). 2483 * If in ``let data drain'' option and linger null, just drop. 2484 * Otherwise (hard), mark socket disconnecting and drop 2485 * current input data; switch states based on user close, and 2486 * send segment to peer (with FIN). 2487 */ 2488 static void 2489 tcp_disconnect(struct tcpcb *tp) 2490 { 2491 struct inpcb *inp = tp->t_inpcb; 2492 struct socket *so = inp->inp_socket; 2493 2494 NET_EPOCH_ASSERT(); 2495 INP_WLOCK_ASSERT(inp); 2496 2497 /* 2498 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2499 * socket is still open. 2500 */ 2501 if (tp->t_state < TCPS_ESTABLISHED && 2502 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2503 tp = tcp_close(tp); 2504 KASSERT(tp != NULL, 2505 ("tcp_disconnect: tcp_close() returned NULL")); 2506 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2507 tp = tcp_drop(tp, 0); 2508 KASSERT(tp != NULL, 2509 ("tcp_disconnect: tcp_drop() returned NULL")); 2510 } else { 2511 soisdisconnecting(so); 2512 sbflush(&so->so_rcv); 2513 tcp_usrclosed(tp); 2514 if (!(inp->inp_flags & INP_DROPPED)) 2515 tp->t_fb->tfb_tcp_output(tp); 2516 } 2517 } 2518 2519 /* 2520 * User issued close, and wish to trail through shutdown states: 2521 * if never received SYN, just forget it. If got a SYN from peer, 2522 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2523 * If already got a FIN from peer, then almost done; go to LAST_ACK 2524 * state. In all other cases, have already sent FIN to peer (e.g. 2525 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2526 * for peer to send FIN or not respond to keep-alives, etc. 2527 * We can let the user exit from the close as soon as the FIN is acked. 2528 */ 2529 static void 2530 tcp_usrclosed(struct tcpcb *tp) 2531 { 2532 2533 NET_EPOCH_ASSERT(); 2534 INP_WLOCK_ASSERT(tp->t_inpcb); 2535 2536 switch (tp->t_state) { 2537 case TCPS_LISTEN: 2538 #ifdef TCP_OFFLOAD 2539 tcp_offload_listen_stop(tp); 2540 #endif 2541 tcp_state_change(tp, TCPS_CLOSED); 2542 /* FALLTHROUGH */ 2543 case TCPS_CLOSED: 2544 tp = tcp_close(tp); 2545 /* 2546 * tcp_close() should never return NULL here as the socket is 2547 * still open. 2548 */ 2549 KASSERT(tp != NULL, 2550 ("tcp_usrclosed: tcp_close() returned NULL")); 2551 break; 2552 2553 case TCPS_SYN_SENT: 2554 case TCPS_SYN_RECEIVED: 2555 tp->t_flags |= TF_NEEDFIN; 2556 break; 2557 2558 case TCPS_ESTABLISHED: 2559 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2560 break; 2561 2562 case TCPS_CLOSE_WAIT: 2563 tcp_state_change(tp, TCPS_LAST_ACK); 2564 break; 2565 } 2566 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2567 soisdisconnected(tp->t_inpcb->inp_socket); 2568 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2569 if (tp->t_state == TCPS_FIN_WAIT_2) { 2570 int timeout; 2571 2572 timeout = (tcp_fast_finwait2_recycle) ? 2573 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2574 tcp_timer_activate(tp, TT_2MSL, timeout); 2575 } 2576 } 2577 } 2578 2579 #ifdef DDB 2580 static void 2581 db_print_indent(int indent) 2582 { 2583 int i; 2584 2585 for (i = 0; i < indent; i++) 2586 db_printf(" "); 2587 } 2588 2589 static void 2590 db_print_tstate(int t_state) 2591 { 2592 2593 switch (t_state) { 2594 case TCPS_CLOSED: 2595 db_printf("TCPS_CLOSED"); 2596 return; 2597 2598 case TCPS_LISTEN: 2599 db_printf("TCPS_LISTEN"); 2600 return; 2601 2602 case TCPS_SYN_SENT: 2603 db_printf("TCPS_SYN_SENT"); 2604 return; 2605 2606 case TCPS_SYN_RECEIVED: 2607 db_printf("TCPS_SYN_RECEIVED"); 2608 return; 2609 2610 case TCPS_ESTABLISHED: 2611 db_printf("TCPS_ESTABLISHED"); 2612 return; 2613 2614 case TCPS_CLOSE_WAIT: 2615 db_printf("TCPS_CLOSE_WAIT"); 2616 return; 2617 2618 case TCPS_FIN_WAIT_1: 2619 db_printf("TCPS_FIN_WAIT_1"); 2620 return; 2621 2622 case TCPS_CLOSING: 2623 db_printf("TCPS_CLOSING"); 2624 return; 2625 2626 case TCPS_LAST_ACK: 2627 db_printf("TCPS_LAST_ACK"); 2628 return; 2629 2630 case TCPS_FIN_WAIT_2: 2631 db_printf("TCPS_FIN_WAIT_2"); 2632 return; 2633 2634 case TCPS_TIME_WAIT: 2635 db_printf("TCPS_TIME_WAIT"); 2636 return; 2637 2638 default: 2639 db_printf("unknown"); 2640 return; 2641 } 2642 } 2643 2644 static void 2645 db_print_tflags(u_int t_flags) 2646 { 2647 int comma; 2648 2649 comma = 0; 2650 if (t_flags & TF_ACKNOW) { 2651 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2652 comma = 1; 2653 } 2654 if (t_flags & TF_DELACK) { 2655 db_printf("%sTF_DELACK", comma ? ", " : ""); 2656 comma = 1; 2657 } 2658 if (t_flags & TF_NODELAY) { 2659 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2660 comma = 1; 2661 } 2662 if (t_flags & TF_NOOPT) { 2663 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2664 comma = 1; 2665 } 2666 if (t_flags & TF_SENTFIN) { 2667 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2668 comma = 1; 2669 } 2670 if (t_flags & TF_REQ_SCALE) { 2671 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2672 comma = 1; 2673 } 2674 if (t_flags & TF_RCVD_SCALE) { 2675 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2676 comma = 1; 2677 } 2678 if (t_flags & TF_REQ_TSTMP) { 2679 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2680 comma = 1; 2681 } 2682 if (t_flags & TF_RCVD_TSTMP) { 2683 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2684 comma = 1; 2685 } 2686 if (t_flags & TF_SACK_PERMIT) { 2687 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2688 comma = 1; 2689 } 2690 if (t_flags & TF_NEEDSYN) { 2691 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2692 comma = 1; 2693 } 2694 if (t_flags & TF_NEEDFIN) { 2695 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2696 comma = 1; 2697 } 2698 if (t_flags & TF_NOPUSH) { 2699 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2700 comma = 1; 2701 } 2702 if (t_flags & TF_MORETOCOME) { 2703 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2704 comma = 1; 2705 } 2706 if (t_flags & TF_LQ_OVERFLOW) { 2707 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2708 comma = 1; 2709 } 2710 if (t_flags & TF_LASTIDLE) { 2711 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2712 comma = 1; 2713 } 2714 if (t_flags & TF_RXWIN0SENT) { 2715 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2716 comma = 1; 2717 } 2718 if (t_flags & TF_FASTRECOVERY) { 2719 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2720 comma = 1; 2721 } 2722 if (t_flags & TF_CONGRECOVERY) { 2723 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2724 comma = 1; 2725 } 2726 if (t_flags & TF_WASFRECOVERY) { 2727 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2728 comma = 1; 2729 } 2730 if (t_flags & TF_SIGNATURE) { 2731 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2732 comma = 1; 2733 } 2734 if (t_flags & TF_FORCEDATA) { 2735 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2736 comma = 1; 2737 } 2738 if (t_flags & TF_TSO) { 2739 db_printf("%sTF_TSO", comma ? ", " : ""); 2740 comma = 1; 2741 } 2742 if (t_flags & TF_FASTOPEN) { 2743 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2744 comma = 1; 2745 } 2746 } 2747 2748 static void 2749 db_print_tflags2(u_int t_flags2) 2750 { 2751 int comma; 2752 2753 comma = 0; 2754 if (t_flags2 & TF2_ECN_PERMIT) { 2755 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : ""); 2756 comma = 1; 2757 } 2758 } 2759 2760 2761 static void 2762 db_print_toobflags(char t_oobflags) 2763 { 2764 int comma; 2765 2766 comma = 0; 2767 if (t_oobflags & TCPOOB_HAVEDATA) { 2768 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2769 comma = 1; 2770 } 2771 if (t_oobflags & TCPOOB_HADDATA) { 2772 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2773 comma = 1; 2774 } 2775 } 2776 2777 static void 2778 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2779 { 2780 2781 db_print_indent(indent); 2782 db_printf("%s at %p\n", name, tp); 2783 2784 indent += 2; 2785 2786 db_print_indent(indent); 2787 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2788 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2789 2790 db_print_indent(indent); 2791 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2792 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2793 2794 db_print_indent(indent); 2795 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2796 &tp->t_timers->tt_delack, tp->t_inpcb); 2797 2798 db_print_indent(indent); 2799 db_printf("t_state: %d (", tp->t_state); 2800 db_print_tstate(tp->t_state); 2801 db_printf(")\n"); 2802 2803 db_print_indent(indent); 2804 db_printf("t_flags: 0x%x (", tp->t_flags); 2805 db_print_tflags(tp->t_flags); 2806 db_printf(")\n"); 2807 2808 db_print_indent(indent); 2809 db_printf("t_flags2: 0x%x (", tp->t_flags2); 2810 db_print_tflags2(tp->t_flags2); 2811 db_printf(")\n"); 2812 2813 db_print_indent(indent); 2814 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2815 tp->snd_una, tp->snd_max, tp->snd_nxt); 2816 2817 db_print_indent(indent); 2818 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2819 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2820 2821 db_print_indent(indent); 2822 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2823 tp->iss, tp->irs, tp->rcv_nxt); 2824 2825 db_print_indent(indent); 2826 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2827 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2828 2829 db_print_indent(indent); 2830 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2831 tp->snd_wnd, tp->snd_cwnd); 2832 2833 db_print_indent(indent); 2834 db_printf("snd_ssthresh: %u snd_recover: " 2835 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2836 2837 db_print_indent(indent); 2838 db_printf("t_rcvtime: %u t_startime: %u\n", 2839 tp->t_rcvtime, tp->t_starttime); 2840 2841 db_print_indent(indent); 2842 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2843 tp->t_rtttime, tp->t_rtseq); 2844 2845 db_print_indent(indent); 2846 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2847 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2848 2849 db_print_indent(indent); 2850 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2851 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2852 tp->t_rttbest); 2853 2854 db_print_indent(indent); 2855 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2856 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2857 2858 db_print_indent(indent); 2859 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2860 db_print_toobflags(tp->t_oobflags); 2861 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2862 2863 db_print_indent(indent); 2864 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2865 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2866 2867 db_print_indent(indent); 2868 db_printf("ts_recent: %u ts_recent_age: %u\n", 2869 tp->ts_recent, tp->ts_recent_age); 2870 2871 db_print_indent(indent); 2872 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2873 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2874 2875 db_print_indent(indent); 2876 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2877 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2878 tp->snd_recover_prev, tp->t_badrxtwin); 2879 2880 db_print_indent(indent); 2881 db_printf("snd_numholes: %d snd_holes first: %p\n", 2882 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2883 2884 db_print_indent(indent); 2885 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n", 2886 tp->snd_fack, tp->rcv_numsacks); 2887 2888 /* Skip sackblks, sackhint. */ 2889 2890 db_print_indent(indent); 2891 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2892 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2893 } 2894 2895 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2896 { 2897 struct tcpcb *tp; 2898 2899 if (!have_addr) { 2900 db_printf("usage: show tcpcb <addr>\n"); 2901 return; 2902 } 2903 tp = (struct tcpcb *)addr; 2904 2905 db_print_tcpcb(tp, "tcpcb", 0); 2906 } 2907 #endif 2908