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 ((inp->inp_vflag & INP_IPV6PROTO) == 0) { 1041 if (m != NULL) 1042 m_freem(m); 1043 error = EAFNOSUPPORT; 1044 goto out; 1045 } 1046 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1047 if (m) 1048 m_freem(m); 1049 error = EAFNOSUPPORT; 1050 goto out; 1051 } 1052 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1053 #ifdef INET 1054 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1055 error = EINVAL; 1056 if (m) 1057 m_freem(m); 1058 goto out; 1059 } 1060 if ((inp->inp_vflag & INP_IPV4) == 0) { 1061 error = EAFNOSUPPORT; 1062 if (m) 1063 m_freem(m); 1064 goto out; 1065 } 1066 restoreflags = true; 1067 inp->inp_vflag &= ~INP_IPV6; 1068 sinp = &sin; 1069 in6_sin6_2_sin(sinp, sin6); 1070 if (IN_MULTICAST( 1071 ntohl(sinp->sin_addr.s_addr))) { 1072 error = EAFNOSUPPORT; 1073 if (m) 1074 m_freem(m); 1075 goto out; 1076 } 1077 if ((error = prison_remote_ip4(td->td_ucred, 1078 &sinp->sin_addr))) { 1079 if (m) 1080 m_freem(m); 1081 goto out; 1082 } 1083 isipv6 = 0; 1084 #else /* !INET */ 1085 error = EAFNOSUPPORT; 1086 if (m) 1087 m_freem(m); 1088 goto out; 1089 #endif /* INET */ 1090 } else { 1091 if ((inp->inp_vflag & INP_IPV6) == 0) { 1092 if (m) 1093 m_freem(m); 1094 error = EAFNOSUPPORT; 1095 goto out; 1096 } 1097 restoreflags = true; 1098 inp->inp_vflag &= ~INP_IPV4; 1099 inp->inp_inc.inc_flags |= INC_ISIPV6; 1100 if ((error = prison_remote_ip6(td->td_ucred, 1101 &sin6->sin6_addr))) { 1102 if (m) 1103 m_freem(m); 1104 goto out; 1105 } 1106 isipv6 = 1; 1107 } 1108 break; 1109 } 1110 #endif /* INET6 */ 1111 default: 1112 if (m) 1113 m_freem(m); 1114 error = EAFNOSUPPORT; 1115 goto out; 1116 } 1117 } 1118 if (control) { 1119 /* TCP doesn't do control messages (rights, creds, etc) */ 1120 if (control->m_len) { 1121 m_freem(control); 1122 if (m) 1123 m_freem(m); 1124 error = EINVAL; 1125 goto out; 1126 } 1127 m_freem(control); /* empty control, just free it */ 1128 } 1129 if (!(flags & PRUS_OOB)) { 1130 sbappendstream(&so->so_snd, m, flags); 1131 if (nam && tp->t_state < TCPS_SYN_SENT) { 1132 /* 1133 * Do implied connect if not yet connected, 1134 * initialize window to default value, and 1135 * initialize maxseg using peer's cached MSS. 1136 */ 1137 #ifdef INET6 1138 if (isipv6) 1139 error = tcp6_connect(tp, nam, td); 1140 #endif /* INET6 */ 1141 #if defined(INET6) && defined(INET) 1142 else 1143 #endif 1144 #ifdef INET 1145 error = tcp_connect(tp, 1146 (struct sockaddr *)sinp, td); 1147 #endif 1148 /* 1149 * The bind operation in tcp_connect succeeded. We 1150 * no longer want to restore the flags if later 1151 * operations fail. 1152 */ 1153 if (error == 0 || inp->inp_lport != 0) 1154 restoreflags = false; 1155 1156 if (error) 1157 goto out; 1158 if (IS_FASTOPEN(tp->t_flags)) 1159 tcp_fastopen_connect(tp); 1160 else { 1161 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1162 tcp_mss(tp, -1); 1163 } 1164 } 1165 if (flags & PRUS_EOF) { 1166 /* 1167 * Close the send side of the connection after 1168 * the data is sent. 1169 */ 1170 socantsendmore(so); 1171 tcp_usrclosed(tp); 1172 } 1173 if (!(inp->inp_flags & INP_DROPPED) && 1174 !(flags & PRUS_NOTREADY)) { 1175 if (flags & PRUS_MORETOCOME) 1176 tp->t_flags |= TF_MORETOCOME; 1177 error = tp->t_fb->tfb_tcp_output(tp); 1178 if (flags & PRUS_MORETOCOME) 1179 tp->t_flags &= ~TF_MORETOCOME; 1180 } 1181 } else { 1182 /* 1183 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1184 */ 1185 SOCKBUF_LOCK(&so->so_snd); 1186 if (sbspace(&so->so_snd) < -512) { 1187 SOCKBUF_UNLOCK(&so->so_snd); 1188 m_freem(m); 1189 error = ENOBUFS; 1190 goto out; 1191 } 1192 /* 1193 * According to RFC961 (Assigned Protocols), 1194 * the urgent pointer points to the last octet 1195 * of urgent data. We continue, however, 1196 * to consider it to indicate the first octet 1197 * of data past the urgent section. 1198 * Otherwise, snd_up should be one lower. 1199 */ 1200 sbappendstream_locked(&so->so_snd, m, flags); 1201 SOCKBUF_UNLOCK(&so->so_snd); 1202 if (nam && tp->t_state < TCPS_SYN_SENT) { 1203 /* 1204 * Do implied connect if not yet connected, 1205 * initialize window to default value, and 1206 * initialize maxseg using peer's cached MSS. 1207 */ 1208 1209 /* 1210 * Not going to contemplate SYN|URG 1211 */ 1212 if (IS_FASTOPEN(tp->t_flags)) 1213 tp->t_flags &= ~TF_FASTOPEN; 1214 #ifdef INET6 1215 if (isipv6) 1216 error = tcp6_connect(tp, nam, td); 1217 #endif /* INET6 */ 1218 #if defined(INET6) && defined(INET) 1219 else 1220 #endif 1221 #ifdef INET 1222 error = tcp_connect(tp, 1223 (struct sockaddr *)sinp, td); 1224 #endif 1225 /* 1226 * The bind operation in tcp_connect succeeded. We 1227 * no longer want to restore the flags if later 1228 * operations fail. 1229 */ 1230 if (error == 0 || inp->inp_lport != 0) 1231 restoreflags = false; 1232 1233 if (error) 1234 goto out; 1235 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1236 tcp_mss(tp, -1); 1237 } 1238 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1239 if (!(flags & PRUS_NOTREADY)) { 1240 tp->t_flags |= TF_FORCEDATA; 1241 error = tp->t_fb->tfb_tcp_output(tp); 1242 tp->t_flags &= ~TF_FORCEDATA; 1243 } 1244 } 1245 TCP_LOG_EVENT(tp, NULL, 1246 &inp->inp_socket->so_rcv, 1247 &inp->inp_socket->so_snd, 1248 TCP_LOG_USERSEND, error, 1249 0, NULL, false); 1250 out: 1251 /* 1252 * If the request was unsuccessful and we changed flags, 1253 * restore the original flags. 1254 */ 1255 if (error != 0 && restoreflags) { 1256 inp->inp_vflag = vflagsav; 1257 inp->inp_inc.inc_flags = incflagsav; 1258 } 1259 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1260 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1261 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1262 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1263 INP_WUNLOCK(inp); 1264 NET_EPOCH_EXIT(et); 1265 return (error); 1266 } 1267 1268 static int 1269 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1270 { 1271 struct epoch_tracker et; 1272 struct inpcb *inp; 1273 struct tcpcb *tp; 1274 int error; 1275 1276 inp = sotoinpcb(so); 1277 INP_WLOCK(inp); 1278 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1279 INP_WUNLOCK(inp); 1280 mb_free_notready(m, count); 1281 return (ECONNRESET); 1282 } 1283 tp = intotcpcb(inp); 1284 1285 SOCKBUF_LOCK(&so->so_snd); 1286 error = sbready(&so->so_snd, m, count); 1287 SOCKBUF_UNLOCK(&so->so_snd); 1288 if (error == 0) { 1289 NET_EPOCH_ENTER(et); 1290 error = tp->t_fb->tfb_tcp_output(tp); 1291 NET_EPOCH_EXIT(et); 1292 } 1293 INP_WUNLOCK(inp); 1294 1295 return (error); 1296 } 1297 1298 /* 1299 * Abort the TCP. Drop the connection abruptly. 1300 */ 1301 static void 1302 tcp_usr_abort(struct socket *so) 1303 { 1304 struct inpcb *inp; 1305 struct tcpcb *tp = NULL; 1306 struct epoch_tracker et; 1307 TCPDEBUG0; 1308 1309 inp = sotoinpcb(so); 1310 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1311 1312 NET_EPOCH_ENTER(et); 1313 INP_WLOCK(inp); 1314 KASSERT(inp->inp_socket != NULL, 1315 ("tcp_usr_abort: inp_socket == NULL")); 1316 1317 /* 1318 * If we still have full TCP state, and we're not dropped, drop. 1319 */ 1320 if (!(inp->inp_flags & INP_TIMEWAIT) && 1321 !(inp->inp_flags & INP_DROPPED)) { 1322 tp = intotcpcb(inp); 1323 TCPDEBUG1(); 1324 tp = tcp_drop(tp, ECONNABORTED); 1325 if (tp == NULL) 1326 goto dropped; 1327 TCPDEBUG2(PRU_ABORT); 1328 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1329 } 1330 if (!(inp->inp_flags & INP_DROPPED)) { 1331 SOCK_LOCK(so); 1332 so->so_state |= SS_PROTOREF; 1333 SOCK_UNLOCK(so); 1334 inp->inp_flags |= INP_SOCKREF; 1335 } 1336 INP_WUNLOCK(inp); 1337 dropped: 1338 NET_EPOCH_EXIT(et); 1339 } 1340 1341 /* 1342 * TCP socket is closed. Start friendly disconnect. 1343 */ 1344 static void 1345 tcp_usr_close(struct socket *so) 1346 { 1347 struct inpcb *inp; 1348 struct tcpcb *tp = NULL; 1349 struct epoch_tracker et; 1350 TCPDEBUG0; 1351 1352 inp = sotoinpcb(so); 1353 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1354 1355 NET_EPOCH_ENTER(et); 1356 INP_WLOCK(inp); 1357 KASSERT(inp->inp_socket != NULL, 1358 ("tcp_usr_close: inp_socket == NULL")); 1359 1360 /* 1361 * If we still have full TCP state, and we're not dropped, initiate 1362 * a disconnect. 1363 */ 1364 if (!(inp->inp_flags & INP_TIMEWAIT) && 1365 !(inp->inp_flags & INP_DROPPED)) { 1366 tp = intotcpcb(inp); 1367 TCPDEBUG1(); 1368 tcp_disconnect(tp); 1369 TCPDEBUG2(PRU_CLOSE); 1370 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1371 } 1372 if (!(inp->inp_flags & INP_DROPPED)) { 1373 SOCK_LOCK(so); 1374 so->so_state |= SS_PROTOREF; 1375 SOCK_UNLOCK(so); 1376 inp->inp_flags |= INP_SOCKREF; 1377 } 1378 INP_WUNLOCK(inp); 1379 NET_EPOCH_EXIT(et); 1380 } 1381 1382 static int 1383 tcp_pru_options_support(struct tcpcb *tp, int flags) 1384 { 1385 /* 1386 * If the specific TCP stack has a pru_options 1387 * specified then it does not always support 1388 * all the PRU_XX options and we must ask it. 1389 * If the function is not specified then all 1390 * of the PRU_XX options are supported. 1391 */ 1392 int ret = 0; 1393 1394 if (tp->t_fb->tfb_pru_options) { 1395 ret = (*tp->t_fb->tfb_pru_options)(tp, flags); 1396 } 1397 return (ret); 1398 } 1399 1400 /* 1401 * Receive out-of-band data. 1402 */ 1403 static int 1404 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1405 { 1406 int error = 0; 1407 struct inpcb *inp; 1408 struct tcpcb *tp = NULL; 1409 1410 TCPDEBUG0; 1411 inp = sotoinpcb(so); 1412 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1413 INP_WLOCK(inp); 1414 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1415 error = ECONNRESET; 1416 goto out; 1417 } 1418 tp = intotcpcb(inp); 1419 error = tcp_pru_options_support(tp, PRUS_OOB); 1420 if (error) { 1421 goto out; 1422 } 1423 TCPDEBUG1(); 1424 if ((so->so_oobmark == 0 && 1425 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1426 so->so_options & SO_OOBINLINE || 1427 tp->t_oobflags & TCPOOB_HADDATA) { 1428 error = EINVAL; 1429 goto out; 1430 } 1431 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1432 error = EWOULDBLOCK; 1433 goto out; 1434 } 1435 m->m_len = 1; 1436 *mtod(m, caddr_t) = tp->t_iobc; 1437 if ((flags & MSG_PEEK) == 0) 1438 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1439 1440 out: 1441 TCPDEBUG2(PRU_RCVOOB); 1442 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1443 INP_WUNLOCK(inp); 1444 return (error); 1445 } 1446 1447 #ifdef INET 1448 struct pr_usrreqs tcp_usrreqs = { 1449 .pru_abort = tcp_usr_abort, 1450 .pru_accept = tcp_usr_accept, 1451 .pru_attach = tcp_usr_attach, 1452 .pru_bind = tcp_usr_bind, 1453 .pru_connect = tcp_usr_connect, 1454 .pru_control = in_control, 1455 .pru_detach = tcp_usr_detach, 1456 .pru_disconnect = tcp_usr_disconnect, 1457 .pru_listen = tcp_usr_listen, 1458 .pru_peeraddr = in_getpeeraddr, 1459 .pru_rcvd = tcp_usr_rcvd, 1460 .pru_rcvoob = tcp_usr_rcvoob, 1461 .pru_send = tcp_usr_send, 1462 .pru_ready = tcp_usr_ready, 1463 .pru_shutdown = tcp_usr_shutdown, 1464 .pru_sockaddr = in_getsockaddr, 1465 .pru_sosetlabel = in_pcbsosetlabel, 1466 .pru_close = tcp_usr_close, 1467 }; 1468 #endif /* INET */ 1469 1470 #ifdef INET6 1471 struct pr_usrreqs tcp6_usrreqs = { 1472 .pru_abort = tcp_usr_abort, 1473 .pru_accept = tcp6_usr_accept, 1474 .pru_attach = tcp_usr_attach, 1475 .pru_bind = tcp6_usr_bind, 1476 .pru_connect = tcp6_usr_connect, 1477 .pru_control = in6_control, 1478 .pru_detach = tcp_usr_detach, 1479 .pru_disconnect = tcp_usr_disconnect, 1480 .pru_listen = tcp6_usr_listen, 1481 .pru_peeraddr = in6_mapped_peeraddr, 1482 .pru_rcvd = tcp_usr_rcvd, 1483 .pru_rcvoob = tcp_usr_rcvoob, 1484 .pru_send = tcp_usr_send, 1485 .pru_ready = tcp_usr_ready, 1486 .pru_shutdown = tcp_usr_shutdown, 1487 .pru_sockaddr = in6_mapped_sockaddr, 1488 .pru_sosetlabel = in_pcbsosetlabel, 1489 .pru_close = tcp_usr_close, 1490 }; 1491 #endif /* INET6 */ 1492 1493 #ifdef INET 1494 /* 1495 * Common subroutine to open a TCP connection to remote host specified 1496 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1497 * port number if needed. Call in_pcbconnect_setup to do the routing and 1498 * to choose a local host address (interface). If there is an existing 1499 * incarnation of the same connection in TIME-WAIT state and if the remote 1500 * host was sending CC options and if the connection duration was < MSL, then 1501 * truncate the previous TIME-WAIT state and proceed. 1502 * Initialize connection parameters and enter SYN-SENT state. 1503 */ 1504 static int 1505 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1506 { 1507 struct inpcb *inp = tp->t_inpcb, *oinp; 1508 struct socket *so = inp->inp_socket; 1509 struct in_addr laddr; 1510 u_short lport; 1511 int error; 1512 1513 NET_EPOCH_ASSERT(); 1514 INP_WLOCK_ASSERT(inp); 1515 INP_HASH_WLOCK(&V_tcbinfo); 1516 1517 if (inp->inp_lport == 0) { 1518 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1519 if (error) 1520 goto out; 1521 } 1522 1523 /* 1524 * Cannot simply call in_pcbconnect, because there might be an 1525 * earlier incarnation of this same connection still in 1526 * TIME_WAIT state, creating an ADDRINUSE error. 1527 */ 1528 laddr = inp->inp_laddr; 1529 lport = inp->inp_lport; 1530 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1531 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1532 if (error && oinp == NULL) 1533 goto out; 1534 if (oinp) { 1535 error = EADDRINUSE; 1536 goto out; 1537 } 1538 inp->inp_laddr = laddr; 1539 in_pcbrehash(inp); 1540 INP_HASH_WUNLOCK(&V_tcbinfo); 1541 1542 /* 1543 * Compute window scaling to request: 1544 * Scale to fit into sweet spot. See tcp_syncache.c. 1545 * XXX: This should move to tcp_output(). 1546 */ 1547 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1548 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1549 tp->request_r_scale++; 1550 1551 soisconnecting(so); 1552 TCPSTAT_INC(tcps_connattempt); 1553 tcp_state_change(tp, TCPS_SYN_SENT); 1554 tp->iss = tcp_new_isn(&inp->inp_inc); 1555 if (tp->t_flags & TF_REQ_TSTMP) 1556 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1557 tcp_sendseqinit(tp); 1558 1559 return 0; 1560 1561 out: 1562 INP_HASH_WUNLOCK(&V_tcbinfo); 1563 return (error); 1564 } 1565 #endif /* INET */ 1566 1567 #ifdef INET6 1568 static int 1569 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1570 { 1571 struct inpcb *inp = tp->t_inpcb; 1572 int error; 1573 1574 INP_WLOCK_ASSERT(inp); 1575 INP_HASH_WLOCK(&V_tcbinfo); 1576 1577 if (inp->inp_lport == 0) { 1578 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1579 if (error) 1580 goto out; 1581 } 1582 error = in6_pcbconnect(inp, nam, td->td_ucred); 1583 if (error != 0) 1584 goto out; 1585 INP_HASH_WUNLOCK(&V_tcbinfo); 1586 1587 /* Compute window scaling to request. */ 1588 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1589 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1590 tp->request_r_scale++; 1591 1592 soisconnecting(inp->inp_socket); 1593 TCPSTAT_INC(tcps_connattempt); 1594 tcp_state_change(tp, TCPS_SYN_SENT); 1595 tp->iss = tcp_new_isn(&inp->inp_inc); 1596 if (tp->t_flags & TF_REQ_TSTMP) 1597 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1598 tcp_sendseqinit(tp); 1599 1600 return 0; 1601 1602 out: 1603 INP_HASH_WUNLOCK(&V_tcbinfo); 1604 return error; 1605 } 1606 #endif /* INET6 */ 1607 1608 /* 1609 * Export TCP internal state information via a struct tcp_info, based on the 1610 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1611 * (TCP state machine, etc). We export all information using FreeBSD-native 1612 * constants -- for example, the numeric values for tcpi_state will differ 1613 * from Linux. 1614 */ 1615 static void 1616 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1617 { 1618 1619 INP_WLOCK_ASSERT(tp->t_inpcb); 1620 bzero(ti, sizeof(*ti)); 1621 1622 ti->tcpi_state = tp->t_state; 1623 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1624 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1625 if (tp->t_flags & TF_SACK_PERMIT) 1626 ti->tcpi_options |= TCPI_OPT_SACK; 1627 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1628 ti->tcpi_options |= TCPI_OPT_WSCALE; 1629 ti->tcpi_snd_wscale = tp->snd_scale; 1630 ti->tcpi_rcv_wscale = tp->rcv_scale; 1631 } 1632 if (tp->t_flags2 & TF2_ECN_PERMIT) 1633 ti->tcpi_options |= TCPI_OPT_ECN; 1634 1635 ti->tcpi_rto = tp->t_rxtcur * tick; 1636 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1637 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1638 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1639 1640 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1641 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1642 1643 /* 1644 * FreeBSD-specific extension fields for tcp_info. 1645 */ 1646 ti->tcpi_rcv_space = tp->rcv_wnd; 1647 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1648 ti->tcpi_snd_wnd = tp->snd_wnd; 1649 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1650 ti->tcpi_snd_nxt = tp->snd_nxt; 1651 ti->tcpi_snd_mss = tp->t_maxseg; 1652 ti->tcpi_rcv_mss = tp->t_maxseg; 1653 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1654 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1655 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1656 #ifdef TCP_OFFLOAD 1657 if (tp->t_flags & TF_TOE) { 1658 ti->tcpi_options |= TCPI_OPT_TOE; 1659 tcp_offload_tcp_info(tp, ti); 1660 } 1661 #endif 1662 } 1663 1664 /* 1665 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1666 * socket option arguments. When it re-acquires the lock after the copy, it 1667 * has to revalidate that the connection is still valid for the socket 1668 * option. 1669 */ 1670 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1671 INP_WLOCK(inp); \ 1672 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1673 INP_WUNLOCK(inp); \ 1674 cleanup; \ 1675 return (ECONNRESET); \ 1676 } \ 1677 tp = intotcpcb(inp); \ 1678 } while(0) 1679 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1680 1681 int 1682 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1683 { 1684 int error; 1685 struct inpcb *inp; 1686 struct tcpcb *tp; 1687 struct tcp_function_block *blk; 1688 struct tcp_function_set fsn; 1689 1690 error = 0; 1691 inp = sotoinpcb(so); 1692 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1693 if (sopt->sopt_level != IPPROTO_TCP) { 1694 #ifdef INET6 1695 if (inp->inp_vflag & INP_IPV6PROTO) { 1696 error = ip6_ctloutput(so, sopt); 1697 /* 1698 * In case of the IPV6_USE_MIN_MTU socket option, 1699 * the INC_IPV6MINMTU flag to announce a corresponding 1700 * MSS during the initial handshake. 1701 * If the TCP connection is not in the front states, 1702 * just reduce the MSS being used. 1703 * This avoids the sending of TCP segments which will 1704 * be fragmented at the IPv6 layer. 1705 */ 1706 if ((error == 0) && 1707 (sopt->sopt_dir == SOPT_SET) && 1708 (sopt->sopt_level == IPPROTO_IPV6) && 1709 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1710 INP_WLOCK(inp); 1711 if ((inp->inp_flags & 1712 (INP_TIMEWAIT | INP_DROPPED))) { 1713 INP_WUNLOCK(inp); 1714 return (ECONNRESET); 1715 } 1716 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1717 tp = intotcpcb(inp); 1718 if ((tp->t_state >= TCPS_SYN_SENT) && 1719 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1720 struct ip6_pktopts *opt; 1721 1722 opt = inp->in6p_outputopts; 1723 if ((opt != NULL) && 1724 (opt->ip6po_minmtu == 1725 IP6PO_MINMTU_ALL)) { 1726 if (tp->t_maxseg > TCP6_MSS) { 1727 tp->t_maxseg = TCP6_MSS; 1728 } 1729 } 1730 } 1731 INP_WUNLOCK(inp); 1732 } 1733 } 1734 #endif /* INET6 */ 1735 #if defined(INET6) && defined(INET) 1736 else 1737 #endif 1738 #ifdef INET 1739 { 1740 error = ip_ctloutput(so, sopt); 1741 } 1742 #endif 1743 return (error); 1744 } 1745 INP_WLOCK(inp); 1746 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1747 INP_WUNLOCK(inp); 1748 return (ECONNRESET); 1749 } 1750 tp = intotcpcb(inp); 1751 /* 1752 * Protect the TCP option TCP_FUNCTION_BLK so 1753 * that a sub-function can *never* overwrite this. 1754 */ 1755 if ((sopt->sopt_dir == SOPT_SET) && 1756 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1757 INP_WUNLOCK(inp); 1758 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1759 sizeof fsn); 1760 if (error) 1761 return (error); 1762 INP_WLOCK_RECHECK(inp); 1763 blk = find_and_ref_tcp_functions(&fsn); 1764 if (blk == NULL) { 1765 INP_WUNLOCK(inp); 1766 return (ENOENT); 1767 } 1768 if (tp->t_fb == blk) { 1769 /* You already have this */ 1770 refcount_release(&blk->tfb_refcnt); 1771 INP_WUNLOCK(inp); 1772 return (0); 1773 } 1774 if (tp->t_state != TCPS_CLOSED) { 1775 /* 1776 * The user has advanced the state 1777 * past the initial point, we may not 1778 * be able to switch. 1779 */ 1780 if (blk->tfb_tcp_handoff_ok != NULL) { 1781 /* 1782 * Does the stack provide a 1783 * query mechanism, if so it may 1784 * still be possible? 1785 */ 1786 error = (*blk->tfb_tcp_handoff_ok)(tp); 1787 } else 1788 error = EINVAL; 1789 if (error) { 1790 refcount_release(&blk->tfb_refcnt); 1791 INP_WUNLOCK(inp); 1792 return(error); 1793 } 1794 } 1795 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1796 refcount_release(&blk->tfb_refcnt); 1797 INP_WUNLOCK(inp); 1798 return (ENOENT); 1799 } 1800 /* 1801 * Release the old refcnt, the 1802 * lookup acquired a ref on the 1803 * new one already. 1804 */ 1805 if (tp->t_fb->tfb_tcp_fb_fini) { 1806 /* 1807 * Tell the stack to cleanup with 0 i.e. 1808 * the tcb is not going away. 1809 */ 1810 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1811 } 1812 #ifdef TCPHPTS 1813 /* Assure that we are not on any hpts */ 1814 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1815 #endif 1816 if (blk->tfb_tcp_fb_init) { 1817 error = (*blk->tfb_tcp_fb_init)(tp); 1818 if (error) { 1819 refcount_release(&blk->tfb_refcnt); 1820 if (tp->t_fb->tfb_tcp_fb_init) { 1821 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1822 /* Fall back failed, drop the connection */ 1823 INP_WUNLOCK(inp); 1824 soabort(so); 1825 return(error); 1826 } 1827 } 1828 goto err_out; 1829 } 1830 } 1831 refcount_release(&tp->t_fb->tfb_refcnt); 1832 tp->t_fb = blk; 1833 #ifdef TCP_OFFLOAD 1834 if (tp->t_flags & TF_TOE) { 1835 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1836 sopt->sopt_name); 1837 } 1838 #endif 1839 err_out: 1840 INP_WUNLOCK(inp); 1841 return (error); 1842 } else if ((sopt->sopt_dir == SOPT_GET) && 1843 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1844 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1845 TCP_FUNCTION_NAME_LEN_MAX); 1846 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1847 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1848 INP_WUNLOCK(inp); 1849 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1850 return (error); 1851 } 1852 /* Pass in the INP locked, called must unlock it */ 1853 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1854 } 1855 1856 /* 1857 * If this assert becomes untrue, we need to change the size of the buf 1858 * variable in tcp_default_ctloutput(). 1859 */ 1860 #ifdef CTASSERT 1861 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1862 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1863 #endif 1864 1865 #ifdef KERN_TLS 1866 static int 1867 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls) 1868 { 1869 struct tls_enable_v0 tls_v0; 1870 int error; 1871 1872 if (sopt->sopt_valsize == sizeof(tls_v0)) { 1873 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0), 1874 sizeof(tls_v0)); 1875 if (error) 1876 return (error); 1877 memset(tls, 0, sizeof(*tls)); 1878 tls->cipher_key = tls_v0.cipher_key; 1879 tls->iv = tls_v0.iv; 1880 tls->auth_key = tls_v0.auth_key; 1881 tls->cipher_algorithm = tls_v0.cipher_algorithm; 1882 tls->cipher_key_len = tls_v0.cipher_key_len; 1883 tls->iv_len = tls_v0.iv_len; 1884 tls->auth_algorithm = tls_v0.auth_algorithm; 1885 tls->auth_key_len = tls_v0.auth_key_len; 1886 tls->flags = tls_v0.flags; 1887 tls->tls_vmajor = tls_v0.tls_vmajor; 1888 tls->tls_vminor = tls_v0.tls_vminor; 1889 return (0); 1890 } 1891 1892 return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls))); 1893 } 1894 #endif 1895 1896 int 1897 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1898 { 1899 int error, opt, optval; 1900 u_int ui; 1901 struct tcp_info ti; 1902 #ifdef KERN_TLS 1903 struct tls_enable tls; 1904 #endif 1905 struct cc_algo *algo; 1906 char *pbuf, buf[TCP_LOG_ID_LEN]; 1907 #ifdef STATS 1908 struct statsblob *sbp; 1909 #endif 1910 size_t len; 1911 1912 /* 1913 * For TCP_CCALGOOPT forward the control to CC module, for both 1914 * SOPT_SET and SOPT_GET. 1915 */ 1916 switch (sopt->sopt_name) { 1917 case TCP_CCALGOOPT: 1918 INP_WUNLOCK(inp); 1919 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 1920 return (EINVAL); 1921 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1922 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1923 sopt->sopt_valsize); 1924 if (error) { 1925 free(pbuf, M_TEMP); 1926 return (error); 1927 } 1928 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1929 if (CC_ALGO(tp)->ctl_output != NULL) 1930 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1931 else 1932 error = ENOENT; 1933 INP_WUNLOCK(inp); 1934 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1935 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1936 free(pbuf, M_TEMP); 1937 return (error); 1938 } 1939 1940 switch (sopt->sopt_dir) { 1941 case SOPT_SET: 1942 switch (sopt->sopt_name) { 1943 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1944 case TCP_MD5SIG: 1945 if (!TCPMD5_ENABLED()) { 1946 INP_WUNLOCK(inp); 1947 return (ENOPROTOOPT); 1948 } 1949 error = TCPMD5_PCBCTL(inp, sopt); 1950 if (error) 1951 return (error); 1952 goto unlock_and_done; 1953 #endif /* IPSEC */ 1954 1955 case TCP_NODELAY: 1956 case TCP_NOOPT: 1957 INP_WUNLOCK(inp); 1958 error = sooptcopyin(sopt, &optval, sizeof optval, 1959 sizeof optval); 1960 if (error) 1961 return (error); 1962 1963 INP_WLOCK_RECHECK(inp); 1964 switch (sopt->sopt_name) { 1965 case TCP_NODELAY: 1966 opt = TF_NODELAY; 1967 break; 1968 case TCP_NOOPT: 1969 opt = TF_NOOPT; 1970 break; 1971 default: 1972 opt = 0; /* dead code to fool gcc */ 1973 break; 1974 } 1975 1976 if (optval) 1977 tp->t_flags |= opt; 1978 else 1979 tp->t_flags &= ~opt; 1980 unlock_and_done: 1981 #ifdef TCP_OFFLOAD 1982 if (tp->t_flags & TF_TOE) { 1983 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1984 sopt->sopt_name); 1985 } 1986 #endif 1987 INP_WUNLOCK(inp); 1988 break; 1989 1990 case TCP_NOPUSH: 1991 INP_WUNLOCK(inp); 1992 error = sooptcopyin(sopt, &optval, sizeof optval, 1993 sizeof optval); 1994 if (error) 1995 return (error); 1996 1997 INP_WLOCK_RECHECK(inp); 1998 if (optval) 1999 tp->t_flags |= TF_NOPUSH; 2000 else if (tp->t_flags & TF_NOPUSH) { 2001 tp->t_flags &= ~TF_NOPUSH; 2002 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 2003 struct epoch_tracker et; 2004 2005 NET_EPOCH_ENTER(et); 2006 error = tp->t_fb->tfb_tcp_output(tp); 2007 NET_EPOCH_EXIT(et); 2008 } 2009 } 2010 goto unlock_and_done; 2011 2012 case TCP_MAXSEG: 2013 INP_WUNLOCK(inp); 2014 error = sooptcopyin(sopt, &optval, sizeof optval, 2015 sizeof optval); 2016 if (error) 2017 return (error); 2018 2019 INP_WLOCK_RECHECK(inp); 2020 if (optval > 0 && optval <= tp->t_maxseg && 2021 optval + 40 >= V_tcp_minmss) 2022 tp->t_maxseg = optval; 2023 else 2024 error = EINVAL; 2025 goto unlock_and_done; 2026 2027 case TCP_INFO: 2028 INP_WUNLOCK(inp); 2029 error = EINVAL; 2030 break; 2031 2032 case TCP_STATS: 2033 INP_WUNLOCK(inp); 2034 #ifdef STATS 2035 error = sooptcopyin(sopt, &optval, sizeof optval, 2036 sizeof optval); 2037 if (error) 2038 return (error); 2039 2040 if (optval > 0) 2041 sbp = stats_blob_alloc( 2042 V_tcp_perconn_stats_dflt_tpl, 0); 2043 else 2044 sbp = NULL; 2045 2046 INP_WLOCK_RECHECK(inp); 2047 if ((tp->t_stats != NULL && sbp == NULL) || 2048 (tp->t_stats == NULL && sbp != NULL)) { 2049 struct statsblob *t = tp->t_stats; 2050 tp->t_stats = sbp; 2051 sbp = t; 2052 } 2053 INP_WUNLOCK(inp); 2054 2055 stats_blob_destroy(sbp); 2056 #else 2057 return (EOPNOTSUPP); 2058 #endif /* !STATS */ 2059 break; 2060 2061 case TCP_CONGESTION: 2062 INP_WUNLOCK(inp); 2063 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 2064 if (error) 2065 break; 2066 buf[sopt->sopt_valsize] = '\0'; 2067 INP_WLOCK_RECHECK(inp); 2068 CC_LIST_RLOCK(); 2069 STAILQ_FOREACH(algo, &cc_list, entries) 2070 if (strncmp(buf, algo->name, 2071 TCP_CA_NAME_MAX) == 0) 2072 break; 2073 CC_LIST_RUNLOCK(); 2074 if (algo == NULL) { 2075 INP_WUNLOCK(inp); 2076 error = EINVAL; 2077 break; 2078 } 2079 /* 2080 * We hold a write lock over the tcb so it's safe to 2081 * do these things without ordering concerns. 2082 */ 2083 if (CC_ALGO(tp)->cb_destroy != NULL) 2084 CC_ALGO(tp)->cb_destroy(tp->ccv); 2085 CC_DATA(tp) = NULL; 2086 CC_ALGO(tp) = algo; 2087 /* 2088 * If something goes pear shaped initialising the new 2089 * algo, fall back to newreno (which does not 2090 * require initialisation). 2091 */ 2092 if (algo->cb_init != NULL && 2093 algo->cb_init(tp->ccv) != 0) { 2094 CC_ALGO(tp) = &newreno_cc_algo; 2095 /* 2096 * The only reason init should fail is 2097 * because of malloc. 2098 */ 2099 error = ENOMEM; 2100 } 2101 INP_WUNLOCK(inp); 2102 break; 2103 2104 #ifdef KERN_TLS 2105 case TCP_TXTLS_ENABLE: 2106 INP_WUNLOCK(inp); 2107 error = copyin_tls_enable(sopt, &tls); 2108 if (error) 2109 break; 2110 error = ktls_enable_tx(so, &tls); 2111 break; 2112 case TCP_TXTLS_MODE: 2113 INP_WUNLOCK(inp); 2114 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2115 if (error) 2116 return (error); 2117 2118 INP_WLOCK_RECHECK(inp); 2119 error = ktls_set_tx_mode(so, ui); 2120 INP_WUNLOCK(inp); 2121 break; 2122 case TCP_RXTLS_ENABLE: 2123 INP_WUNLOCK(inp); 2124 error = sooptcopyin(sopt, &tls, sizeof(tls), 2125 sizeof(tls)); 2126 if (error) 2127 break; 2128 error = ktls_enable_rx(so, &tls); 2129 break; 2130 #endif 2131 2132 case TCP_KEEPIDLE: 2133 case TCP_KEEPINTVL: 2134 case TCP_KEEPINIT: 2135 INP_WUNLOCK(inp); 2136 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2137 if (error) 2138 return (error); 2139 2140 if (ui > (UINT_MAX / hz)) { 2141 error = EINVAL; 2142 break; 2143 } 2144 ui *= hz; 2145 2146 INP_WLOCK_RECHECK(inp); 2147 switch (sopt->sopt_name) { 2148 case TCP_KEEPIDLE: 2149 tp->t_keepidle = ui; 2150 /* 2151 * XXX: better check current remaining 2152 * timeout and "merge" it with new value. 2153 */ 2154 if ((tp->t_state > TCPS_LISTEN) && 2155 (tp->t_state <= TCPS_CLOSING)) 2156 tcp_timer_activate(tp, TT_KEEP, 2157 TP_KEEPIDLE(tp)); 2158 break; 2159 case TCP_KEEPINTVL: 2160 tp->t_keepintvl = ui; 2161 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2162 (TP_MAXIDLE(tp) > 0)) 2163 tcp_timer_activate(tp, TT_2MSL, 2164 TP_MAXIDLE(tp)); 2165 break; 2166 case TCP_KEEPINIT: 2167 tp->t_keepinit = ui; 2168 if (tp->t_state == TCPS_SYN_RECEIVED || 2169 tp->t_state == TCPS_SYN_SENT) 2170 tcp_timer_activate(tp, TT_KEEP, 2171 TP_KEEPINIT(tp)); 2172 break; 2173 } 2174 goto unlock_and_done; 2175 2176 case TCP_KEEPCNT: 2177 INP_WUNLOCK(inp); 2178 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2179 if (error) 2180 return (error); 2181 2182 INP_WLOCK_RECHECK(inp); 2183 tp->t_keepcnt = ui; 2184 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2185 (TP_MAXIDLE(tp) > 0)) 2186 tcp_timer_activate(tp, TT_2MSL, 2187 TP_MAXIDLE(tp)); 2188 goto unlock_and_done; 2189 2190 #ifdef TCPPCAP 2191 case TCP_PCAP_OUT: 2192 case TCP_PCAP_IN: 2193 INP_WUNLOCK(inp); 2194 error = sooptcopyin(sopt, &optval, sizeof optval, 2195 sizeof optval); 2196 if (error) 2197 return (error); 2198 2199 INP_WLOCK_RECHECK(inp); 2200 if (optval >= 0) 2201 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 2202 &(tp->t_outpkts) : &(tp->t_inpkts), 2203 optval); 2204 else 2205 error = EINVAL; 2206 goto unlock_and_done; 2207 #endif 2208 2209 case TCP_FASTOPEN: { 2210 struct tcp_fastopen tfo_optval; 2211 2212 INP_WUNLOCK(inp); 2213 if (!V_tcp_fastopen_client_enable && 2214 !V_tcp_fastopen_server_enable) 2215 return (EPERM); 2216 2217 error = sooptcopyin(sopt, &tfo_optval, 2218 sizeof(tfo_optval), sizeof(int)); 2219 if (error) 2220 return (error); 2221 2222 INP_WLOCK_RECHECK(inp); 2223 if (tfo_optval.enable) { 2224 if (tp->t_state == TCPS_LISTEN) { 2225 if (!V_tcp_fastopen_server_enable) { 2226 error = EPERM; 2227 goto unlock_and_done; 2228 } 2229 2230 tp->t_flags |= TF_FASTOPEN; 2231 if (tp->t_tfo_pending == NULL) 2232 tp->t_tfo_pending = 2233 tcp_fastopen_alloc_counter(); 2234 } else { 2235 /* 2236 * If a pre-shared key was provided, 2237 * stash it in the client cookie 2238 * field of the tcpcb for use during 2239 * connect. 2240 */ 2241 if (sopt->sopt_valsize == 2242 sizeof(tfo_optval)) { 2243 memcpy(tp->t_tfo_cookie.client, 2244 tfo_optval.psk, 2245 TCP_FASTOPEN_PSK_LEN); 2246 tp->t_tfo_client_cookie_len = 2247 TCP_FASTOPEN_PSK_LEN; 2248 } 2249 tp->t_flags |= TF_FASTOPEN; 2250 } 2251 } else 2252 tp->t_flags &= ~TF_FASTOPEN; 2253 goto unlock_and_done; 2254 } 2255 2256 #ifdef TCP_BLACKBOX 2257 case TCP_LOG: 2258 INP_WUNLOCK(inp); 2259 error = sooptcopyin(sopt, &optval, sizeof optval, 2260 sizeof optval); 2261 if (error) 2262 return (error); 2263 2264 INP_WLOCK_RECHECK(inp); 2265 error = tcp_log_state_change(tp, optval); 2266 goto unlock_and_done; 2267 2268 case TCP_LOGBUF: 2269 INP_WUNLOCK(inp); 2270 error = EINVAL; 2271 break; 2272 2273 case TCP_LOGID: 2274 INP_WUNLOCK(inp); 2275 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2276 if (error) 2277 break; 2278 buf[sopt->sopt_valsize] = '\0'; 2279 INP_WLOCK_RECHECK(inp); 2280 error = tcp_log_set_id(tp, buf); 2281 /* tcp_log_set_id() unlocks the INP. */ 2282 break; 2283 2284 case TCP_LOGDUMP: 2285 case TCP_LOGDUMPID: 2286 INP_WUNLOCK(inp); 2287 error = 2288 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2289 if (error) 2290 break; 2291 buf[sopt->sopt_valsize] = '\0'; 2292 INP_WLOCK_RECHECK(inp); 2293 if (sopt->sopt_name == TCP_LOGDUMP) { 2294 error = tcp_log_dump_tp_logbuf(tp, buf, 2295 M_WAITOK, true); 2296 INP_WUNLOCK(inp); 2297 } else { 2298 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2299 /* 2300 * tcp_log_dump_tp_bucket_logbufs() drops the 2301 * INP lock. 2302 */ 2303 } 2304 break; 2305 #endif 2306 2307 default: 2308 INP_WUNLOCK(inp); 2309 error = ENOPROTOOPT; 2310 break; 2311 } 2312 break; 2313 2314 case SOPT_GET: 2315 tp = intotcpcb(inp); 2316 switch (sopt->sopt_name) { 2317 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2318 case TCP_MD5SIG: 2319 if (!TCPMD5_ENABLED()) { 2320 INP_WUNLOCK(inp); 2321 return (ENOPROTOOPT); 2322 } 2323 error = TCPMD5_PCBCTL(inp, sopt); 2324 break; 2325 #endif 2326 2327 case TCP_NODELAY: 2328 optval = tp->t_flags & TF_NODELAY; 2329 INP_WUNLOCK(inp); 2330 error = sooptcopyout(sopt, &optval, sizeof optval); 2331 break; 2332 case TCP_MAXSEG: 2333 optval = tp->t_maxseg; 2334 INP_WUNLOCK(inp); 2335 error = sooptcopyout(sopt, &optval, sizeof optval); 2336 break; 2337 case TCP_NOOPT: 2338 optval = tp->t_flags & TF_NOOPT; 2339 INP_WUNLOCK(inp); 2340 error = sooptcopyout(sopt, &optval, sizeof optval); 2341 break; 2342 case TCP_NOPUSH: 2343 optval = tp->t_flags & TF_NOPUSH; 2344 INP_WUNLOCK(inp); 2345 error = sooptcopyout(sopt, &optval, sizeof optval); 2346 break; 2347 case TCP_INFO: 2348 tcp_fill_info(tp, &ti); 2349 INP_WUNLOCK(inp); 2350 error = sooptcopyout(sopt, &ti, sizeof ti); 2351 break; 2352 case TCP_STATS: 2353 { 2354 #ifdef STATS 2355 int nheld; 2356 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2357 2358 error = 0; 2359 socklen_t outsbsz = sopt->sopt_valsize; 2360 if (tp->t_stats == NULL) 2361 error = ENOENT; 2362 else if (outsbsz >= tp->t_stats->cursz) 2363 outsbsz = tp->t_stats->cursz; 2364 else if (outsbsz >= sizeof(struct statsblob)) 2365 outsbsz = sizeof(struct statsblob); 2366 else 2367 error = EINVAL; 2368 INP_WUNLOCK(inp); 2369 if (error) 2370 break; 2371 2372 sbp = sopt->sopt_val; 2373 nheld = atop(round_page(((vm_offset_t)sbp) + 2374 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2375 vm_page_t ma[nheld]; 2376 if (vm_fault_quick_hold_pages( 2377 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2378 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2379 nheld) < 0) { 2380 error = EFAULT; 2381 break; 2382 } 2383 2384 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2385 SIZEOF_MEMBER(struct statsblob, flags)))) 2386 goto unhold; 2387 2388 INP_WLOCK_RECHECK(inp); 2389 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2390 sbflags | SB_CLONE_USRDSTNOFAULT); 2391 INP_WUNLOCK(inp); 2392 sopt->sopt_valsize = outsbsz; 2393 unhold: 2394 vm_page_unhold_pages(ma, nheld); 2395 #else 2396 INP_WUNLOCK(inp); 2397 error = EOPNOTSUPP; 2398 #endif /* !STATS */ 2399 break; 2400 } 2401 case TCP_CONGESTION: 2402 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2403 INP_WUNLOCK(inp); 2404 error = sooptcopyout(sopt, buf, len + 1); 2405 break; 2406 case TCP_KEEPIDLE: 2407 case TCP_KEEPINTVL: 2408 case TCP_KEEPINIT: 2409 case TCP_KEEPCNT: 2410 switch (sopt->sopt_name) { 2411 case TCP_KEEPIDLE: 2412 ui = TP_KEEPIDLE(tp) / hz; 2413 break; 2414 case TCP_KEEPINTVL: 2415 ui = TP_KEEPINTVL(tp) / hz; 2416 break; 2417 case TCP_KEEPINIT: 2418 ui = TP_KEEPINIT(tp) / hz; 2419 break; 2420 case TCP_KEEPCNT: 2421 ui = TP_KEEPCNT(tp); 2422 break; 2423 } 2424 INP_WUNLOCK(inp); 2425 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2426 break; 2427 #ifdef TCPPCAP 2428 case TCP_PCAP_OUT: 2429 case TCP_PCAP_IN: 2430 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2431 &(tp->t_outpkts) : &(tp->t_inpkts)); 2432 INP_WUNLOCK(inp); 2433 error = sooptcopyout(sopt, &optval, sizeof optval); 2434 break; 2435 #endif 2436 case TCP_FASTOPEN: 2437 optval = tp->t_flags & TF_FASTOPEN; 2438 INP_WUNLOCK(inp); 2439 error = sooptcopyout(sopt, &optval, sizeof optval); 2440 break; 2441 #ifdef TCP_BLACKBOX 2442 case TCP_LOG: 2443 optval = tp->t_logstate; 2444 INP_WUNLOCK(inp); 2445 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2446 break; 2447 case TCP_LOGBUF: 2448 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2449 error = tcp_log_getlogbuf(sopt, tp); 2450 break; 2451 case TCP_LOGID: 2452 len = tcp_log_get_id(tp, buf); 2453 INP_WUNLOCK(inp); 2454 error = sooptcopyout(sopt, buf, len + 1); 2455 break; 2456 case TCP_LOGDUMP: 2457 case TCP_LOGDUMPID: 2458 INP_WUNLOCK(inp); 2459 error = EINVAL; 2460 break; 2461 #endif 2462 #ifdef KERN_TLS 2463 case TCP_TXTLS_MODE: 2464 optval = ktls_get_tx_mode(so); 2465 INP_WUNLOCK(inp); 2466 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2467 break; 2468 case TCP_RXTLS_MODE: 2469 optval = ktls_get_rx_mode(so); 2470 INP_WUNLOCK(inp); 2471 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2472 break; 2473 #endif 2474 default: 2475 INP_WUNLOCK(inp); 2476 error = ENOPROTOOPT; 2477 break; 2478 } 2479 break; 2480 } 2481 return (error); 2482 } 2483 #undef INP_WLOCK_RECHECK 2484 #undef INP_WLOCK_RECHECK_CLEANUP 2485 2486 /* 2487 * Initiate (or continue) disconnect. 2488 * If embryonic state, just send reset (once). 2489 * If in ``let data drain'' option and linger null, just drop. 2490 * Otherwise (hard), mark socket disconnecting and drop 2491 * current input data; switch states based on user close, and 2492 * send segment to peer (with FIN). 2493 */ 2494 static void 2495 tcp_disconnect(struct tcpcb *tp) 2496 { 2497 struct inpcb *inp = tp->t_inpcb; 2498 struct socket *so = inp->inp_socket; 2499 2500 NET_EPOCH_ASSERT(); 2501 INP_WLOCK_ASSERT(inp); 2502 2503 /* 2504 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2505 * socket is still open. 2506 */ 2507 if (tp->t_state < TCPS_ESTABLISHED && 2508 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2509 tp = tcp_close(tp); 2510 KASSERT(tp != NULL, 2511 ("tcp_disconnect: tcp_close() returned NULL")); 2512 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2513 tp = tcp_drop(tp, 0); 2514 KASSERT(tp != NULL, 2515 ("tcp_disconnect: tcp_drop() returned NULL")); 2516 } else { 2517 soisdisconnecting(so); 2518 sbflush(&so->so_rcv); 2519 tcp_usrclosed(tp); 2520 if (!(inp->inp_flags & INP_DROPPED)) 2521 tp->t_fb->tfb_tcp_output(tp); 2522 } 2523 } 2524 2525 /* 2526 * User issued close, and wish to trail through shutdown states: 2527 * if never received SYN, just forget it. If got a SYN from peer, 2528 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2529 * If already got a FIN from peer, then almost done; go to LAST_ACK 2530 * state. In all other cases, have already sent FIN to peer (e.g. 2531 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2532 * for peer to send FIN or not respond to keep-alives, etc. 2533 * We can let the user exit from the close as soon as the FIN is acked. 2534 */ 2535 static void 2536 tcp_usrclosed(struct tcpcb *tp) 2537 { 2538 2539 NET_EPOCH_ASSERT(); 2540 INP_WLOCK_ASSERT(tp->t_inpcb); 2541 2542 switch (tp->t_state) { 2543 case TCPS_LISTEN: 2544 #ifdef TCP_OFFLOAD 2545 tcp_offload_listen_stop(tp); 2546 #endif 2547 tcp_state_change(tp, TCPS_CLOSED); 2548 /* FALLTHROUGH */ 2549 case TCPS_CLOSED: 2550 tp = tcp_close(tp); 2551 /* 2552 * tcp_close() should never return NULL here as the socket is 2553 * still open. 2554 */ 2555 KASSERT(tp != NULL, 2556 ("tcp_usrclosed: tcp_close() returned NULL")); 2557 break; 2558 2559 case TCPS_SYN_SENT: 2560 case TCPS_SYN_RECEIVED: 2561 tp->t_flags |= TF_NEEDFIN; 2562 break; 2563 2564 case TCPS_ESTABLISHED: 2565 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2566 break; 2567 2568 case TCPS_CLOSE_WAIT: 2569 tcp_state_change(tp, TCPS_LAST_ACK); 2570 break; 2571 } 2572 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2573 soisdisconnected(tp->t_inpcb->inp_socket); 2574 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2575 if (tp->t_state == TCPS_FIN_WAIT_2) { 2576 int timeout; 2577 2578 timeout = (tcp_fast_finwait2_recycle) ? 2579 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2580 tcp_timer_activate(tp, TT_2MSL, timeout); 2581 } 2582 } 2583 } 2584 2585 #ifdef DDB 2586 static void 2587 db_print_indent(int indent) 2588 { 2589 int i; 2590 2591 for (i = 0; i < indent; i++) 2592 db_printf(" "); 2593 } 2594 2595 static void 2596 db_print_tstate(int t_state) 2597 { 2598 2599 switch (t_state) { 2600 case TCPS_CLOSED: 2601 db_printf("TCPS_CLOSED"); 2602 return; 2603 2604 case TCPS_LISTEN: 2605 db_printf("TCPS_LISTEN"); 2606 return; 2607 2608 case TCPS_SYN_SENT: 2609 db_printf("TCPS_SYN_SENT"); 2610 return; 2611 2612 case TCPS_SYN_RECEIVED: 2613 db_printf("TCPS_SYN_RECEIVED"); 2614 return; 2615 2616 case TCPS_ESTABLISHED: 2617 db_printf("TCPS_ESTABLISHED"); 2618 return; 2619 2620 case TCPS_CLOSE_WAIT: 2621 db_printf("TCPS_CLOSE_WAIT"); 2622 return; 2623 2624 case TCPS_FIN_WAIT_1: 2625 db_printf("TCPS_FIN_WAIT_1"); 2626 return; 2627 2628 case TCPS_CLOSING: 2629 db_printf("TCPS_CLOSING"); 2630 return; 2631 2632 case TCPS_LAST_ACK: 2633 db_printf("TCPS_LAST_ACK"); 2634 return; 2635 2636 case TCPS_FIN_WAIT_2: 2637 db_printf("TCPS_FIN_WAIT_2"); 2638 return; 2639 2640 case TCPS_TIME_WAIT: 2641 db_printf("TCPS_TIME_WAIT"); 2642 return; 2643 2644 default: 2645 db_printf("unknown"); 2646 return; 2647 } 2648 } 2649 2650 static void 2651 db_print_tflags(u_int t_flags) 2652 { 2653 int comma; 2654 2655 comma = 0; 2656 if (t_flags & TF_ACKNOW) { 2657 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2658 comma = 1; 2659 } 2660 if (t_flags & TF_DELACK) { 2661 db_printf("%sTF_DELACK", comma ? ", " : ""); 2662 comma = 1; 2663 } 2664 if (t_flags & TF_NODELAY) { 2665 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2666 comma = 1; 2667 } 2668 if (t_flags & TF_NOOPT) { 2669 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2670 comma = 1; 2671 } 2672 if (t_flags & TF_SENTFIN) { 2673 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2674 comma = 1; 2675 } 2676 if (t_flags & TF_REQ_SCALE) { 2677 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2678 comma = 1; 2679 } 2680 if (t_flags & TF_RCVD_SCALE) { 2681 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2682 comma = 1; 2683 } 2684 if (t_flags & TF_REQ_TSTMP) { 2685 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2686 comma = 1; 2687 } 2688 if (t_flags & TF_RCVD_TSTMP) { 2689 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2690 comma = 1; 2691 } 2692 if (t_flags & TF_SACK_PERMIT) { 2693 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2694 comma = 1; 2695 } 2696 if (t_flags & TF_NEEDSYN) { 2697 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2698 comma = 1; 2699 } 2700 if (t_flags & TF_NEEDFIN) { 2701 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2702 comma = 1; 2703 } 2704 if (t_flags & TF_NOPUSH) { 2705 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2706 comma = 1; 2707 } 2708 if (t_flags & TF_MORETOCOME) { 2709 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2710 comma = 1; 2711 } 2712 if (t_flags & TF_LQ_OVERFLOW) { 2713 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2714 comma = 1; 2715 } 2716 if (t_flags & TF_LASTIDLE) { 2717 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2718 comma = 1; 2719 } 2720 if (t_flags & TF_RXWIN0SENT) { 2721 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2722 comma = 1; 2723 } 2724 if (t_flags & TF_FASTRECOVERY) { 2725 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2726 comma = 1; 2727 } 2728 if (t_flags & TF_CONGRECOVERY) { 2729 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2730 comma = 1; 2731 } 2732 if (t_flags & TF_WASFRECOVERY) { 2733 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2734 comma = 1; 2735 } 2736 if (t_flags & TF_SIGNATURE) { 2737 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2738 comma = 1; 2739 } 2740 if (t_flags & TF_FORCEDATA) { 2741 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2742 comma = 1; 2743 } 2744 if (t_flags & TF_TSO) { 2745 db_printf("%sTF_TSO", comma ? ", " : ""); 2746 comma = 1; 2747 } 2748 if (t_flags & TF_FASTOPEN) { 2749 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2750 comma = 1; 2751 } 2752 } 2753 2754 static void 2755 db_print_tflags2(u_int t_flags2) 2756 { 2757 int comma; 2758 2759 comma = 0; 2760 if (t_flags2 & TF2_ECN_PERMIT) { 2761 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : ""); 2762 comma = 1; 2763 } 2764 } 2765 2766 2767 static void 2768 db_print_toobflags(char t_oobflags) 2769 { 2770 int comma; 2771 2772 comma = 0; 2773 if (t_oobflags & TCPOOB_HAVEDATA) { 2774 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2775 comma = 1; 2776 } 2777 if (t_oobflags & TCPOOB_HADDATA) { 2778 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2779 comma = 1; 2780 } 2781 } 2782 2783 static void 2784 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2785 { 2786 2787 db_print_indent(indent); 2788 db_printf("%s at %p\n", name, tp); 2789 2790 indent += 2; 2791 2792 db_print_indent(indent); 2793 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2794 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2795 2796 db_print_indent(indent); 2797 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2798 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2799 2800 db_print_indent(indent); 2801 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2802 &tp->t_timers->tt_delack, tp->t_inpcb); 2803 2804 db_print_indent(indent); 2805 db_printf("t_state: %d (", tp->t_state); 2806 db_print_tstate(tp->t_state); 2807 db_printf(")\n"); 2808 2809 db_print_indent(indent); 2810 db_printf("t_flags: 0x%x (", tp->t_flags); 2811 db_print_tflags(tp->t_flags); 2812 db_printf(")\n"); 2813 2814 db_print_indent(indent); 2815 db_printf("t_flags2: 0x%x (", tp->t_flags2); 2816 db_print_tflags2(tp->t_flags2); 2817 db_printf(")\n"); 2818 2819 db_print_indent(indent); 2820 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2821 tp->snd_una, tp->snd_max, tp->snd_nxt); 2822 2823 db_print_indent(indent); 2824 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2825 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2826 2827 db_print_indent(indent); 2828 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2829 tp->iss, tp->irs, tp->rcv_nxt); 2830 2831 db_print_indent(indent); 2832 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2833 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2834 2835 db_print_indent(indent); 2836 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2837 tp->snd_wnd, tp->snd_cwnd); 2838 2839 db_print_indent(indent); 2840 db_printf("snd_ssthresh: %u snd_recover: " 2841 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2842 2843 db_print_indent(indent); 2844 db_printf("t_rcvtime: %u t_startime: %u\n", 2845 tp->t_rcvtime, tp->t_starttime); 2846 2847 db_print_indent(indent); 2848 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2849 tp->t_rtttime, tp->t_rtseq); 2850 2851 db_print_indent(indent); 2852 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2853 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2854 2855 db_print_indent(indent); 2856 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2857 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2858 tp->t_rttbest); 2859 2860 db_print_indent(indent); 2861 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2862 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2863 2864 db_print_indent(indent); 2865 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2866 db_print_toobflags(tp->t_oobflags); 2867 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2868 2869 db_print_indent(indent); 2870 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2871 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2872 2873 db_print_indent(indent); 2874 db_printf("ts_recent: %u ts_recent_age: %u\n", 2875 tp->ts_recent, tp->ts_recent_age); 2876 2877 db_print_indent(indent); 2878 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2879 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2880 2881 db_print_indent(indent); 2882 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2883 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2884 tp->snd_recover_prev, tp->t_badrxtwin); 2885 2886 db_print_indent(indent); 2887 db_printf("snd_numholes: %d snd_holes first: %p\n", 2888 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2889 2890 db_print_indent(indent); 2891 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n", 2892 tp->snd_fack, tp->rcv_numsacks); 2893 2894 /* Skip sackblks, sackhint. */ 2895 2896 db_print_indent(indent); 2897 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2898 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2899 } 2900 2901 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2902 { 2903 struct tcpcb *tp; 2904 2905 if (!have_addr) { 2906 db_printf("usage: show tcpcb <addr>\n"); 2907 return; 2908 } 2909 tp = (struct tcpcb *)addr; 2910 2911 db_print_tcpcb(tp, "tcpcb", 0); 2912 } 2913 #endif 2914