sys/netinet/tcp_usrreq.c

   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_tcpdebug.h"
  48
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/limits.h>
  52 #include <sys/malloc.h>
  53 #include <sys/refcount.h>
  54 #include <sys/kernel.h>
  55 #include <sys/sysctl.h>
  56 #include <sys/mbuf.h>
  57 #ifdef INET6
  58 #include <sys/domain.h>
  59 #endif /* INET6 */
  60 #include <sys/socket.h>
  61 #include <sys/socketvar.h>
  62 #include <sys/protosw.h>
  63 #include <sys/proc.h>
  64 #include <sys/jail.h>
  65 #include <sys/syslog.h>
  66
  67 #ifdef DDB
  68 #include <ddb/ddb.h>
  69 #endif
  70
  71 #include <net/if.h>
  72 #include <net/if_var.h>
  73 #include <net/route.h>
  74 #include <net/vnet.h>
  75
  76 #include <netinet/in.h>
  77 #include <netinet/in_kdtrace.h>
  78 #include <netinet/in_pcb.h>
  79 #include <netinet/in_systm.h>
  80 #include <netinet/in_var.h>
  81 #include <netinet/ip_var.h>
  82 #ifdef INET6
  83 #include <netinet/ip6.h>
  84 #include <netinet6/in6_pcb.h>
  85 #include <netinet6/ip6_var.h>
  86 #include <netinet6/scope6_var.h>
  87 #endif
  88 #include <netinet/tcp.h>
  89 #include <netinet/tcp_fsm.h>
  90 #include <netinet/tcp_seq.h>
  91 #include <netinet/tcp_timer.h>
  92 #include <netinet/tcp_var.h>
  93 #include <netinet/tcp_log_buf.h>
  94 #include <netinet/tcpip.h>
  95 #include <netinet/cc/cc.h>
  96 #include <netinet/tcp_fastopen.h>
  97 #include <netinet/tcp_hpts.h>
  98 #ifdef TCPPCAP
  99 #include <netinet/tcp_pcap.h>
 100 #endif
 101 #ifdef TCPDEBUG
 102 #include <netinet/tcp_debug.h>
 103 #endif
 104 #ifdef TCP_OFFLOAD
 105 #include <netinet/tcp_offload.h>
 106 #endif
 107 #include <netipsec/ipsec_support.h>
 108
 109 /*
 110  * TCP protocol interface to socket abstraction.
 111  */
 112 static int      tcp_attach(struct socket *);
 113 #ifdef INET
 114 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
 115                     struct thread *td);
 116 #endif /* INET */
 117 #ifdef INET6
 118 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
 119                     struct thread *td);
 120 #endif /* INET6 */
 121 static void     tcp_disconnect(struct tcpcb *);
 122 static void     tcp_usrclosed(struct tcpcb *);
 123 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 124
 125 #ifdef TCPDEBUG
 126 #define TCPDEBUG0       int ostate = 0
 127 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 128 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 129                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 130 #else
 131 #define TCPDEBUG0
 132 #define TCPDEBUG1()
 133 #define TCPDEBUG2(req)
 134 #endif
 135
 136 /*
 137  * TCP attaches to socket via pru_attach(), reserving space,
 138  * and an internet control block.
 139  */
 140 static int
 141 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 142 {
 143         struct inpcb *inp;
 144         struct tcpcb *tp = NULL;
 145         int error;
 146         TCPDEBUG0;
 147
 148         inp = sotoinpcb(so);
 149         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 150         TCPDEBUG1();
 151
 152         error = tcp_attach(so);
 153         if (error)
 154                 goto out;
 155
 156         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 157                 so->so_linger = TCP_LINGERTIME;
 158
 159         inp = sotoinpcb(so);
 160         tp = intotcpcb(inp);
 161 out:
 162         TCPDEBUG2(PRU_ATTACH);
 163         TCP_PROBE2(debug__user, tp, PRU_ATTACH);
 164         return error;
 165 }
 166
 167 /*
 168  * tcp_detach is called when the socket layer loses its final reference
 169  * to the socket, be it a file descriptor reference, a reference from TCP,
 170  * etc.  At this point, there is only one case in which we will keep around
 171  * inpcb state: time wait.
 172  *
 173  * This function can probably be re-absorbed back into tcp_usr_detach() now
 174  * that there is a single detach path.
 175  */
 176 static void
 177 tcp_detach(struct socket *so, struct inpcb *inp)
 178 {
 179         struct tcpcb *tp;
 180
 181         INP_INFO_LOCK_ASSERT(&V_tcbinfo);
 182         INP_WLOCK_ASSERT(inp);
 183
 184         KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
 185         KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
 186
 187         tp = intotcpcb(inp);
 188
 189         if (inp->inp_flags & INP_TIMEWAIT) {
 190                 /*
 191                  * There are two cases to handle: one in which the time wait
 192                  * state is being discarded (INP_DROPPED), and one in which
 193                  * this connection will remain in timewait.  In the former,
 194                  * it is time to discard all state (except tcptw, which has
 195                  * already been discarded by the timewait close code, which
 196                  * should be further up the call stack somewhere).  In the
 197                  * latter case, we detach from the socket, but leave the pcb
 198                  * present until timewait ends.
 199                  *
 200                  * XXXRW: Would it be cleaner to free the tcptw here?
 201                  *
 202                  * Astute question indeed, from twtcp perspective there are
 203                  * four cases to consider:
 204                  *
 205                  * #1 tcp_detach is called at tcptw creation time by
 206                  *  tcp_twstart, then do not discard the newly created tcptw
 207                  *  and leave inpcb present until timewait ends
 208                  * #2 tcp_detach is called at tcptw creation time by
 209                  *  tcp_twstart, but connection is local and tw will be
 210                  *  discarded immediately
 211                  * #3 tcp_detach is called at timewait end (or reuse) by
 212                  *  tcp_twclose, then the tcptw has already been discarded
 213                  *  (or reused) and inpcb is freed here
 214                  * #4 tcp_detach is called() after timewait ends (or reuse)
 215                  *  (e.g. by soclose), then tcptw has already been discarded
 216                  *  (or reused) and inpcb is freed here
 217                  *
 218                  *  In all three cases the tcptw should not be freed here.
 219                  */
 220                 if (inp->inp_flags & INP_DROPPED) {
 221                         in_pcbdetach(inp);
 222                         if (__predict_true(tp == NULL)) {
 223                                 in_pcbfree(inp);
 224                         } else {
 225                                 /*
 226                                  * This case should not happen as in TIMEWAIT
 227                                  * state the inp should not be destroyed before
 228                                  * its tcptw.  If INVARIANTS is defined, panic.
 229                                  */
 230 #ifdef INVARIANTS
 231                                 panic("%s: Panic before an inp double-free: "
 232                                     "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
 233                                     , __func__);
 234 #else
 235                                 log(LOG_ERR, "%s: Avoid an inp double-free: "
 236                                     "INP_TIMEWAIT && INP_DROPPED && tp != NULL"
 237                                     , __func__);
 238 #endif
 239                                 INP_WUNLOCK(inp);
 240                         }
 241                 } else {
 242                         in_pcbdetach(inp);
 243                         INP_WUNLOCK(inp);
 244                 }
 245         } else {
 246                 /*
 247                  * If the connection is not in timewait, we consider two
 248                  * two conditions: one in which no further processing is
 249                  * necessary (dropped || embryonic), and one in which TCP is
 250                  * not yet done, but no longer requires the socket, so the
 251                  * pcb will persist for the time being.
 252                  *
 253                  * XXXRW: Does the second case still occur?
 254                  */
 255                 if (inp->inp_flags & INP_DROPPED ||
 256                     tp->t_state < TCPS_SYN_SENT) {
 257                         tcp_discardcb(tp);
 258                         in_pcbdetach(inp);
 259                         in_pcbfree(inp);
 260                 } else {
 261                         in_pcbdetach(inp);
 262                         INP_WUNLOCK(inp);
 263                 }
 264         }
 265 }
 266
 267 /*
 268  * pru_detach() detaches the TCP protocol from the socket.
 269  * If the protocol state is non-embryonic, then can't
 270  * do this directly: have to initiate a pru_disconnect(),
 271  * which may finish later; embryonic TCB's can just
 272  * be discarded here.
 273  */
 274 static void
 275 tcp_usr_detach(struct socket *so)
 276 {
 277         struct inpcb *inp;
 278         int rlock = 0;
 279
 280         inp = sotoinpcb(so);
 281         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
 282         if (!INP_INFO_WLOCKED(&V_tcbinfo)) {
 283                 INP_INFO_RLOCK(&V_tcbinfo);
 284                 rlock = 1;
 285         }
 286         INP_WLOCK(inp);
 287         KASSERT(inp->inp_socket != NULL,
 288             ("tcp_usr_detach: inp_socket == NULL"));
 289         tcp_detach(so, inp);
 290         if (rlock)
 291                 INP_INFO_RUNLOCK(&V_tcbinfo);
 292 }
 293
 294 #ifdef INET
 295 /*
 296  * Give the socket an address.
 297  */
 298 static int
 299 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 300 {
 301         int error = 0;
 302         struct inpcb *inp;
 303         struct tcpcb *tp = NULL;
 304         struct sockaddr_in *sinp;
 305
 306         sinp = (struct sockaddr_in *)nam;
 307         if (nam->sa_len != sizeof (*sinp))
 308                 return (EINVAL);
 309         /*
 310          * Must check for multicast addresses and disallow binding
 311          * to them.
 312          */
 313         if (sinp->sin_family == AF_INET &&
 314             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 315                 return (EAFNOSUPPORT);
 316
 317         TCPDEBUG0;
 318         inp = sotoinpcb(so);
 319         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 320         INP_WLOCK(inp);
 321         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 322                 error = EINVAL;
 323                 goto out;
 324         }
 325         tp = intotcpcb(inp);
 326         TCPDEBUG1();
 327         INP_HASH_WLOCK(&V_tcbinfo);
 328         error = in_pcbbind(inp, nam, td->td_ucred);
 329         INP_HASH_WUNLOCK(&V_tcbinfo);
 330 out:
 331         TCPDEBUG2(PRU_BIND);
 332         TCP_PROBE2(debug__user, tp, PRU_BIND);
 333         INP_WUNLOCK(inp);
 334
 335         return (error);
 336 }
 337 #endif /* INET */
 338
 339 #ifdef INET6
 340 static int
 341 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 342 {
 343         int error = 0;
 344         struct inpcb *inp;
 345         struct tcpcb *tp = NULL;
 346         struct sockaddr_in6 *sin6p;
 347
 348         sin6p = (struct sockaddr_in6 *)nam;
 349         if (nam->sa_len != sizeof (*sin6p))
 350                 return (EINVAL);
 351         /*
 352          * Must check for multicast addresses and disallow binding
 353          * to them.
 354          */
 355         if (sin6p->sin6_family == AF_INET6 &&
 356             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 357                 return (EAFNOSUPPORT);
 358
 359         TCPDEBUG0;
 360         inp = sotoinpcb(so);
 361         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 362         INP_WLOCK(inp);
 363         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 364                 error = EINVAL;
 365                 goto out;
 366         }
 367         tp = intotcpcb(inp);
 368         TCPDEBUG1();
 369         INP_HASH_WLOCK(&V_tcbinfo);
 370         inp->inp_vflag &= ~INP_IPV4;
 371         inp->inp_vflag |= INP_IPV6;
 372 #ifdef INET
 373         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 374                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 375                         inp->inp_vflag |= INP_IPV4;
 376                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 377                         struct sockaddr_in sin;
 378
 379                         in6_sin6_2_sin(&sin, sin6p);
 380                         inp->inp_vflag |= INP_IPV4;
 381                         inp->inp_vflag &= ~INP_IPV6;
 382                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 383                             td->td_ucred);
 384                         INP_HASH_WUNLOCK(&V_tcbinfo);
 385                         goto out;
 386                 }
 387         }
 388 #endif
 389         error = in6_pcbbind(inp, nam, td->td_ucred);
 390         INP_HASH_WUNLOCK(&V_tcbinfo);
 391 out:
 392         TCPDEBUG2(PRU_BIND);
 393         TCP_PROBE2(debug__user, tp, PRU_BIND);
 394         INP_WUNLOCK(inp);
 395         return (error);
 396 }
 397 #endif /* INET6 */
 398
 399 #ifdef INET
 400 /*
 401  * Prepare to accept connections.
 402  */
 403 static int
 404 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 405 {
 406         int error = 0;
 407         struct inpcb *inp;
 408         struct tcpcb *tp = NULL;
 409
 410         TCPDEBUG0;
 411         inp = sotoinpcb(so);
 412         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 413         INP_WLOCK(inp);
 414         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 415                 error = EINVAL;
 416                 goto out;
 417         }
 418         tp = intotcpcb(inp);
 419         TCPDEBUG1();
 420         SOCK_LOCK(so);
 421         error = solisten_proto_check(so);
 422         INP_HASH_WLOCK(&V_tcbinfo);
 423         if (error == 0 && inp->inp_lport == 0)
 424                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 425         INP_HASH_WUNLOCK(&V_tcbinfo);
 426         if (error == 0) {
 427                 tcp_state_change(tp, TCPS_LISTEN);
 428                 solisten_proto(so, backlog);
 429 #ifdef TCP_OFFLOAD
 430                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 431                         tcp_offload_listen_start(tp);
 432 #endif
 433         }
 434         SOCK_UNLOCK(so);
 435
 436         if (IS_FASTOPEN(tp->t_flags))
 437                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 438
 439 out:
 440         TCPDEBUG2(PRU_LISTEN);
 441         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 442         INP_WUNLOCK(inp);
 443         return (error);
 444 }
 445 #endif /* INET */
 446
 447 #ifdef INET6
 448 static int
 449 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 450 {
 451         int error = 0;
 452         struct inpcb *inp;
 453         struct tcpcb *tp = NULL;
 454
 455         TCPDEBUG0;
 456         inp = sotoinpcb(so);
 457         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 458         INP_WLOCK(inp);
 459         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 460                 error = EINVAL;
 461                 goto out;
 462         }
 463         tp = intotcpcb(inp);
 464         TCPDEBUG1();
 465         SOCK_LOCK(so);
 466         error = solisten_proto_check(so);
 467         INP_HASH_WLOCK(&V_tcbinfo);
 468         if (error == 0 && inp->inp_lport == 0) {
 469                 inp->inp_vflag &= ~INP_IPV4;
 470                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 471                         inp->inp_vflag |= INP_IPV4;
 472                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 473         }
 474         INP_HASH_WUNLOCK(&V_tcbinfo);
 475         if (error == 0) {
 476                 tcp_state_change(tp, TCPS_LISTEN);
 477                 solisten_proto(so, backlog);
 478 #ifdef TCP_OFFLOAD
 479                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 480                         tcp_offload_listen_start(tp);
 481 #endif
 482         }
 483         SOCK_UNLOCK(so);
 484
 485         if (IS_FASTOPEN(tp->t_flags))
 486                 tp->t_tfo_pending = tcp_fastopen_alloc_counter();
 487
 488 out:
 489         TCPDEBUG2(PRU_LISTEN);
 490         TCP_PROBE2(debug__user, tp, PRU_LISTEN);
 491         INP_WUNLOCK(inp);
 492         return (error);
 493 }
 494 #endif /* INET6 */
 495
 496 #ifdef INET
 497 /*
 498  * Initiate connection to peer.
 499  * Create a template for use in transmissions on this connection.
 500  * Enter SYN_SENT state, and mark socket as connecting.
 501  * Start keep-alive timer, and seed output sequence space.
 502  * Send initial segment on connection.
 503  */
 504 static int
 505 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 506 {
 507         int error = 0;
 508         struct inpcb *inp;
 509         struct tcpcb *tp = NULL;
 510         struct sockaddr_in *sinp;
 511
 512         sinp = (struct sockaddr_in *)nam;
 513         if (nam->sa_len != sizeof (*sinp))
 514                 return (EINVAL);
 515         /*
 516          * Must disallow TCP ``connections'' to multicast addresses.
 517          */
 518         if (sinp->sin_family == AF_INET
 519             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 520                 return (EAFNOSUPPORT);
 521         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 522                 return (error);
 523
 524         TCPDEBUG0;
 525         inp = sotoinpcb(so);
 526         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 527         INP_WLOCK(inp);
 528         if (inp->inp_flags & INP_TIMEWAIT) {
 529                 error = EADDRINUSE;
 530                 goto out;
 531         }
 532         if (inp->inp_flags & INP_DROPPED) {
 533                 error = ECONNREFUSED;
 534                 goto out;
 535         }
 536         tp = intotcpcb(inp);
 537         TCPDEBUG1();
 538         if ((error = tcp_connect(tp, nam, td)) != 0)
 539                 goto out;
 540 #ifdef TCP_OFFLOAD
 541         if (registered_toedevs > 0 &&
 542             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 543             (error = tcp_offload_connect(so, nam)) == 0)
 544                 goto out;
 545 #endif
 546         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 547         error = tp->t_fb->tfb_tcp_output(tp);
 548 out:
 549         TCPDEBUG2(PRU_CONNECT);
 550         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 551         INP_WUNLOCK(inp);
 552         return (error);
 553 }
 554 #endif /* INET */
 555
 556 #ifdef INET6
 557 static int
 558 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 559 {
 560         int error = 0;
 561         struct inpcb *inp;
 562         struct tcpcb *tp = NULL;
 563         struct sockaddr_in6 *sin6p;
 564
 565         TCPDEBUG0;
 566
 567         sin6p = (struct sockaddr_in6 *)nam;
 568         if (nam->sa_len != sizeof (*sin6p))
 569                 return (EINVAL);
 570         /*
 571          * Must disallow TCP ``connections'' to multicast addresses.
 572          */
 573         if (sin6p->sin6_family == AF_INET6
 574             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 575                 return (EAFNOSUPPORT);
 576
 577         inp = sotoinpcb(so);
 578         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 579         INP_WLOCK(inp);
 580         if (inp->inp_flags & INP_TIMEWAIT) {
 581                 error = EADDRINUSE;
 582                 goto out;
 583         }
 584         if (inp->inp_flags & INP_DROPPED) {
 585                 error = ECONNREFUSED;
 586                 goto out;
 587         }
 588         tp = intotcpcb(inp);
 589         TCPDEBUG1();
 590 #ifdef INET
 591         /*
 592          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 593          * therefore probably require the hash lock, which isn't held here.
 594          * Is this a significant problem?
 595          */
 596         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 597                 struct sockaddr_in sin;
 598
 599                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 600                         error = EINVAL;
 601                         goto out;
 602                 }
 603                 if ((inp->inp_vflag & INP_IPV4) == 0) {
 604                         error = EAFNOSUPPORT;
 605                         goto out;
 606                 }
 607
 608                 in6_sin6_2_sin(&sin, sin6p);
 609                 inp->inp_vflag |= INP_IPV4;
 610                 inp->inp_vflag &= ~INP_IPV6;
 611                 if ((error = prison_remote_ip4(td->td_ucred,
 612                     &sin.sin_addr)) != 0)
 613                         goto out;
 614                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 615                         goto out;
 616 #ifdef TCP_OFFLOAD
 617                 if (registered_toedevs > 0 &&
 618                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 619                     (error = tcp_offload_connect(so, nam)) == 0)
 620                         goto out;
 621 #endif
 622                 error = tp->t_fb->tfb_tcp_output(tp);
 623                 goto out;
 624         } else {
 625                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 626                         error = EAFNOSUPPORT;
 627                         goto out;
 628                 }
 629         }
 630 #endif
 631         inp->inp_vflag &= ~INP_IPV4;
 632         inp->inp_vflag |= INP_IPV6;
 633         inp->inp_inc.inc_flags |= INC_ISIPV6;
 634         if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
 635                 goto out;
 636         if ((error = tcp6_connect(tp, nam, td)) != 0)
 637                 goto out;
 638 #ifdef TCP_OFFLOAD
 639         if (registered_toedevs > 0 &&
 640             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 641             (error = tcp_offload_connect(so, nam)) == 0)
 642                 goto out;
 643 #endif
 644         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 645         error = tp->t_fb->tfb_tcp_output(tp);
 646
 647 out:
 648         TCPDEBUG2(PRU_CONNECT);
 649         TCP_PROBE2(debug__user, tp, PRU_CONNECT);
 650         INP_WUNLOCK(inp);
 651         return (error);
 652 }
 653 #endif /* INET6 */
 654
 655 /*
 656  * Initiate disconnect from peer.
 657  * If connection never passed embryonic stage, just drop;
 658  * else if don't need to let data drain, then can just drop anyways,
 659  * else have to begin TCP shutdown process: mark socket disconnecting,
 660  * drain unread data, state switch to reflect user close, and
 661  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 662  * when peer sends FIN and acks ours.
 663  *
 664  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 665  */
 666 static int
 667 tcp_usr_disconnect(struct socket *so)
 668 {
 669         struct inpcb *inp;
 670         struct tcpcb *tp = NULL;
 671         int error = 0;
 672
 673         TCPDEBUG0;
 674         INP_INFO_RLOCK(&V_tcbinfo);
 675         inp = sotoinpcb(so);
 676         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 677         INP_WLOCK(inp);
 678         if (inp->inp_flags & INP_TIMEWAIT)
 679                 goto out;
 680         if (inp->inp_flags & INP_DROPPED) {
 681                 error = ECONNRESET;
 682                 goto out;
 683         }
 684         tp = intotcpcb(inp);
 685         TCPDEBUG1();
 686         tcp_disconnect(tp);
 687 out:
 688         TCPDEBUG2(PRU_DISCONNECT);
 689         TCP_PROBE2(debug__user, tp, PRU_DISCONNECT);
 690         INP_WUNLOCK(inp);
 691         INP_INFO_RUNLOCK(&V_tcbinfo);
 692         return (error);
 693 }
 694
 695 #ifdef INET
 696 /*
 697  * Accept a connection.  Essentially all the work is done at higher levels;
 698  * just return the address of the peer, storing through addr.
 699  */
 700 static int
 701 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 702 {
 703         int error = 0;
 704         struct inpcb *inp = NULL;
 705         struct tcpcb *tp = NULL;
 706         struct in_addr addr;
 707         in_port_t port = 0;
 708         TCPDEBUG0;
 709
 710         if (so->so_state & SS_ISDISCONNECTED)
 711                 return (ECONNABORTED);
 712
 713         inp = sotoinpcb(so);
 714         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 715         INP_WLOCK(inp);
 716         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 717                 error = ECONNABORTED;
 718                 goto out;
 719         }
 720         tp = intotcpcb(inp);
 721         TCPDEBUG1();
 722
 723         /*
 724          * We inline in_getpeeraddr and COMMON_END here, so that we can
 725          * copy the data of interest and defer the malloc until after we
 726          * release the lock.
 727          */
 728         port = inp->inp_fport;
 729         addr = inp->inp_faddr;
 730
 731 out:
 732         TCPDEBUG2(PRU_ACCEPT);
 733         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 734         INP_WUNLOCK(inp);
 735         if (error == 0)
 736                 *nam = in_sockaddr(port, &addr);
 737         return error;
 738 }
 739 #endif /* INET */
 740
 741 #ifdef INET6
 742 static int
 743 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 744 {
 745         struct inpcb *inp = NULL;
 746         int error = 0;
 747         struct tcpcb *tp = NULL;
 748         struct in_addr addr;
 749         struct in6_addr addr6;
 750         in_port_t port = 0;
 751         int v4 = 0;
 752         TCPDEBUG0;
 753
 754         if (so->so_state & SS_ISDISCONNECTED)
 755                 return (ECONNABORTED);
 756
 757         inp = sotoinpcb(so);
 758         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 759         INP_INFO_RLOCK(&V_tcbinfo);
 760         INP_WLOCK(inp);
 761         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 762                 error = ECONNABORTED;
 763                 goto out;
 764         }
 765         tp = intotcpcb(inp);
 766         TCPDEBUG1();
 767
 768         /*
 769          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 770          * copy the data of interest and defer the malloc until after we
 771          * release the lock.
 772          */
 773         if (inp->inp_vflag & INP_IPV4) {
 774                 v4 = 1;
 775                 port = inp->inp_fport;
 776                 addr = inp->inp_faddr;
 777         } else {
 778                 port = inp->inp_fport;
 779                 addr6 = inp->in6p_faddr;
 780         }
 781
 782 out:
 783         TCPDEBUG2(PRU_ACCEPT);
 784         TCP_PROBE2(debug__user, tp, PRU_ACCEPT);
 785         INP_WUNLOCK(inp);
 786         INP_INFO_RUNLOCK(&V_tcbinfo);
 787         if (error == 0) {
 788                 if (v4)
 789                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 790                 else
 791                         *nam = in6_sockaddr(port, &addr6);
 792         }
 793         return error;
 794 }
 795 #endif /* INET6 */
 796
 797 /*
 798  * Mark the connection as being incapable of further output.
 799  */
 800 static int
 801 tcp_usr_shutdown(struct socket *so)
 802 {
 803         int error = 0;
 804         struct inpcb *inp;
 805         struct tcpcb *tp = NULL;
 806
 807         TCPDEBUG0;
 808         INP_INFO_RLOCK(&V_tcbinfo);
 809         inp = sotoinpcb(so);
 810         KASSERT(inp != NULL, ("inp == NULL"));
 811         INP_WLOCK(inp);
 812         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 813                 error = ECONNRESET;
 814                 goto out;
 815         }
 816         tp = intotcpcb(inp);
 817         TCPDEBUG1();
 818         socantsendmore(so);
 819         tcp_usrclosed(tp);
 820         if (!(inp->inp_flags & INP_DROPPED))
 821                 error = tp->t_fb->tfb_tcp_output(tp);
 822
 823 out:
 824         TCPDEBUG2(PRU_SHUTDOWN);
 825         TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN);
 826         INP_WUNLOCK(inp);
 827         INP_INFO_RUNLOCK(&V_tcbinfo);
 828
 829         return (error);
 830 }
 831
 832 /*
 833  * After a receive, possibly send window update to peer.
 834  */
 835 static int
 836 tcp_usr_rcvd(struct socket *so, int flags)
 837 {
 838         struct inpcb *inp;
 839         struct tcpcb *tp = NULL;
 840         int error = 0;
 841
 842         TCPDEBUG0;
 843         inp = sotoinpcb(so);
 844         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 845         INP_WLOCK(inp);
 846         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 847                 error = ECONNRESET;
 848                 goto out;
 849         }
 850         tp = intotcpcb(inp);
 851         TCPDEBUG1();
 852         /*
 853          * For passively-created TFO connections, don't attempt a window
 854          * update while still in SYN_RECEIVED as this may trigger an early
 855          * SYN|ACK.  It is preferable to have the SYN|ACK be sent along with
 856          * application response data, or failing that, when the DELACK timer
 857          * expires.
 858          */
 859         if (IS_FASTOPEN(tp->t_flags) &&
 860             (tp->t_state == TCPS_SYN_RECEIVED))
 861                 goto out;
 862 #ifdef TCP_OFFLOAD
 863         if (tp->t_flags & TF_TOE)
 864                 tcp_offload_rcvd(tp);
 865         else
 866 #endif
 867         tp->t_fb->tfb_tcp_output(tp);
 868
 869 out:
 870         TCPDEBUG2(PRU_RCVD);
 871         TCP_PROBE2(debug__user, tp, PRU_RCVD);
 872         INP_WUNLOCK(inp);
 873         return (error);
 874 }
 875
 876 /*
 877  * Do a send by putting data in output queue and updating urgent
 878  * marker if URG set.  Possibly send more data.  Unlike the other
 879  * pru_*() routines, the mbuf chains are our responsibility.  We
 880  * must either enqueue them or free them.  The other pru_* routines
 881  * generally are caller-frees.
 882  */
 883 static int
 884 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 885     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 886 {
 887         int error = 0;
 888         struct inpcb *inp;
 889         struct tcpcb *tp = NULL;
 890 #ifdef INET6
 891         int isipv6;
 892 #endif
 893         TCPDEBUG0;
 894
 895         /*
 896          * We require the pcbinfo lock if we will close the socket as part of
 897          * this call.
 898          */
 899         if (flags & PRUS_EOF)
 900                 INP_INFO_RLOCK(&V_tcbinfo);
 901         inp = sotoinpcb(so);
 902         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 903         INP_WLOCK(inp);
 904         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 905                 if (control)
 906                         m_freem(control);
 907                 /*
 908                  * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible
 909                  * for freeing memory.
 910                  */
 911                 if (m && (flags & PRUS_NOTREADY) == 0)
 912                         m_freem(m);
 913                 error = ECONNRESET;
 914                 goto out;
 915         }
 916 #ifdef INET6
 917         isipv6 = nam && nam->sa_family == AF_INET6;
 918 #endif /* INET6 */
 919         tp = intotcpcb(inp);
 920         TCPDEBUG1();
 921         if (control) {
 922                 /* TCP doesn't do control messages (rights, creds, etc) */
 923                 if (control->m_len) {
 924                         m_freem(control);
 925                         if (m)
 926                                 m_freem(m);
 927                         error = EINVAL;
 928                         goto out;
 929                 }
 930                 m_freem(control);       /* empty control, just free it */
 931         }
 932         if (!(flags & PRUS_OOB)) {
 933                 sbappendstream(&so->so_snd, m, flags);
 934                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 935                         /*
 936                          * Do implied connect if not yet connected,
 937                          * initialize window to default value, and
 938                          * initialize maxseg using peer's cached MSS.
 939                          */
 940 #ifdef INET6
 941                         if (isipv6)
 942                                 error = tcp6_connect(tp, nam, td);
 943 #endif /* INET6 */
 944 #if defined(INET6) && defined(INET)
 945                         else
 946 #endif
 947 #ifdef INET
 948                                 error = tcp_connect(tp, nam, td);
 949 #endif
 950                         if (error)
 951                                 goto out;
 952                         if (IS_FASTOPEN(tp->t_flags))
 953                                 tcp_fastopen_connect(tp);
 954                         else {
 955                                 tp->snd_wnd = TTCP_CLIENT_SND_WND;
 956                                 tcp_mss(tp, -1);
 957                         }
 958                 }
 959                 if (flags & PRUS_EOF) {
 960                         /*
 961                          * Close the send side of the connection after
 962                          * the data is sent.
 963                          */
 964                         INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
 965                         socantsendmore(so);
 966                         tcp_usrclosed(tp);
 967                 }
 968                 if (!(inp->inp_flags & INP_DROPPED) &&
 969                     !(flags & PRUS_NOTREADY)) {
 970                         if (flags & PRUS_MORETOCOME)
 971                                 tp->t_flags |= TF_MORETOCOME;
 972                         error = tp->t_fb->tfb_tcp_output(tp);
 973                         if (flags & PRUS_MORETOCOME)
 974                                 tp->t_flags &= ~TF_MORETOCOME;
 975                 }
 976         } else {
 977                 /*
 978                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 979                  */
 980                 SOCKBUF_LOCK(&so->so_snd);
 981                 if (sbspace(&so->so_snd) < -512) {
 982                         SOCKBUF_UNLOCK(&so->so_snd);
 983                         m_freem(m);
 984                         error = ENOBUFS;
 985                         goto out;
 986                 }
 987                 /*
 988                  * According to RFC961 (Assigned Protocols),
 989                  * the urgent pointer points to the last octet
 990                  * of urgent data.  We continue, however,
 991                  * to consider it to indicate the first octet
 992                  * of data past the urgent section.
 993                  * Otherwise, snd_up should be one lower.
 994                  */
 995                 sbappendstream_locked(&so->so_snd, m, flags);
 996                 SOCKBUF_UNLOCK(&so->so_snd);
 997                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 998                         /*
 999                          * Do implied connect if not yet connected,
1000                          * initialize window to default value, and
1001                          * initialize maxseg using peer's cached MSS.
1002                          */
1003
1004                         /*
1005                          * Not going to contemplate SYN|URG
1006                          */
1007                         if (IS_FASTOPEN(tp->t_flags))
1008                                 tp->t_flags &= ~TF_FASTOPEN;
1009 #ifdef INET6
1010                         if (isipv6)
1011                                 error = tcp6_connect(tp, nam, td);
1012 #endif /* INET6 */
1013 #if defined(INET6) && defined(INET)
1014                         else
1015 #endif
1016 #ifdef INET
1017                                 error = tcp_connect(tp, nam, td);
1018 #endif
1019                         if (error)
1020                                 goto out;
1021                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
1022                         tcp_mss(tp, -1);
1023                 }
1024                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
1025                 if (!(flags & PRUS_NOTREADY)) {
1026                         tp->t_flags |= TF_FORCEDATA;
1027                         error = tp->t_fb->tfb_tcp_output(tp);
1028                         tp->t_flags &= ~TF_FORCEDATA;
1029                 }
1030         }
1031         TCP_LOG_EVENT(tp, NULL,
1032             &inp->inp_socket->so_rcv,
1033             &inp->inp_socket->so_snd,
1034             TCP_LOG_USERSEND, error,
1035             0, NULL, false);
1036 out:
1037         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
1038                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1039         TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB :
1040                    ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
1041         INP_WUNLOCK(inp);
1042         if (flags & PRUS_EOF)
1043                 INP_INFO_RUNLOCK(&V_tcbinfo);
1044         return (error);
1045 }
1046
1047 static int
1048 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
1049 {
1050         struct inpcb *inp;
1051         struct tcpcb *tp;
1052         int error;
1053
1054         inp = sotoinpcb(so);
1055         INP_WLOCK(inp);
1056         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1057                 INP_WUNLOCK(inp);
1058                 for (int i = 0; i < count; i++)
1059                         m = m_free(m);
1060                 return (ECONNRESET);
1061         }
1062         tp = intotcpcb(inp);
1063
1064         SOCKBUF_LOCK(&so->so_snd);
1065         error = sbready(&so->so_snd, m, count);
1066         SOCKBUF_UNLOCK(&so->so_snd);
1067         if (error == 0)
1068                 error = tp->t_fb->tfb_tcp_output(tp);
1069         INP_WUNLOCK(inp);
1070
1071         return (error);
1072 }
1073
1074 /*
1075  * Abort the TCP.  Drop the connection abruptly.
1076  */
1077 static void
1078 tcp_usr_abort(struct socket *so)
1079 {
1080         struct inpcb *inp;
1081         struct tcpcb *tp = NULL;
1082         TCPDEBUG0;
1083
1084         inp = sotoinpcb(so);
1085         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1086
1087         INP_INFO_RLOCK(&V_tcbinfo);
1088         INP_WLOCK(inp);
1089         KASSERT(inp->inp_socket != NULL,
1090             ("tcp_usr_abort: inp_socket == NULL"));
1091
1092         /*
1093          * If we still have full TCP state, and we're not dropped, drop.
1094          */
1095         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1096             !(inp->inp_flags & INP_DROPPED)) {
1097                 tp = intotcpcb(inp);
1098                 TCPDEBUG1();
1099                 tp = tcp_drop(tp, ECONNABORTED);
1100                 if (tp == NULL)
1101                         goto dropped;
1102                 TCPDEBUG2(PRU_ABORT);
1103                 TCP_PROBE2(debug__user, tp, PRU_ABORT);
1104         }
1105         if (!(inp->inp_flags & INP_DROPPED)) {
1106                 SOCK_LOCK(so);
1107                 so->so_state |= SS_PROTOREF;
1108                 SOCK_UNLOCK(so);
1109                 inp->inp_flags |= INP_SOCKREF;
1110         }
1111         INP_WUNLOCK(inp);
1112 dropped:
1113         INP_INFO_RUNLOCK(&V_tcbinfo);
1114 }
1115
1116 /*
1117  * TCP socket is closed.  Start friendly disconnect.
1118  */
1119 static void
1120 tcp_usr_close(struct socket *so)
1121 {
1122         struct inpcb *inp;
1123         struct tcpcb *tp = NULL;
1124         TCPDEBUG0;
1125
1126         inp = sotoinpcb(so);
1127         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1128
1129         INP_INFO_RLOCK(&V_tcbinfo);
1130         INP_WLOCK(inp);
1131         KASSERT(inp->inp_socket != NULL,
1132             ("tcp_usr_close: inp_socket == NULL"));
1133
1134         /*
1135          * If we still have full TCP state, and we're not dropped, initiate
1136          * a disconnect.
1137          */
1138         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1139             !(inp->inp_flags & INP_DROPPED)) {
1140                 tp = intotcpcb(inp);
1141                 TCPDEBUG1();
1142                 tcp_disconnect(tp);
1143                 TCPDEBUG2(PRU_CLOSE);
1144                 TCP_PROBE2(debug__user, tp, PRU_CLOSE);
1145         }
1146         if (!(inp->inp_flags & INP_DROPPED)) {
1147                 SOCK_LOCK(so);
1148                 so->so_state |= SS_PROTOREF;
1149                 SOCK_UNLOCK(so);
1150                 inp->inp_flags |= INP_SOCKREF;
1151         }
1152         INP_WUNLOCK(inp);
1153         INP_INFO_RUNLOCK(&V_tcbinfo);
1154 }
1155
1156 /*
1157  * Receive out-of-band data.
1158  */
1159 static int
1160 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1161 {
1162         int error = 0;
1163         struct inpcb *inp;
1164         struct tcpcb *tp = NULL;
1165
1166         TCPDEBUG0;
1167         inp = sotoinpcb(so);
1168         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1169         INP_WLOCK(inp);
1170         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1171                 error = ECONNRESET;
1172                 goto out;
1173         }
1174         tp = intotcpcb(inp);
1175         TCPDEBUG1();
1176         if ((so->so_oobmark == 0 &&
1177              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1178             so->so_options & SO_OOBINLINE ||
1179             tp->t_oobflags & TCPOOB_HADDATA) {
1180                 error = EINVAL;
1181                 goto out;
1182         }
1183         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1184                 error = EWOULDBLOCK;
1185                 goto out;
1186         }
1187         m->m_len = 1;
1188         *mtod(m, caddr_t) = tp->t_iobc;
1189         if ((flags & MSG_PEEK) == 0)
1190                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1191
1192 out:
1193         TCPDEBUG2(PRU_RCVOOB);
1194         TCP_PROBE2(debug__user, tp, PRU_RCVOOB);
1195         INP_WUNLOCK(inp);
1196         return (error);
1197 }
1198
1199 #ifdef INET
1200 struct pr_usrreqs tcp_usrreqs = {
1201         .pru_abort =            tcp_usr_abort,
1202         .pru_accept =           tcp_usr_accept,
1203         .pru_attach =           tcp_usr_attach,
1204         .pru_bind =             tcp_usr_bind,
1205         .pru_connect =          tcp_usr_connect,
1206         .pru_control =          in_control,
1207         .pru_detach =           tcp_usr_detach,
1208         .pru_disconnect =       tcp_usr_disconnect,
1209         .pru_listen =           tcp_usr_listen,
1210         .pru_peeraddr =         in_getpeeraddr,
1211         .pru_rcvd =             tcp_usr_rcvd,
1212         .pru_rcvoob =           tcp_usr_rcvoob,
1213         .pru_send =             tcp_usr_send,
1214         .pru_ready =            tcp_usr_ready,
1215         .pru_shutdown =         tcp_usr_shutdown,
1216         .pru_sockaddr =         in_getsockaddr,
1217         .pru_sosetlabel =       in_pcbsosetlabel,
1218         .pru_close =            tcp_usr_close,
1219 };
1220 #endif /* INET */
1221
1222 #ifdef INET6
1223 struct pr_usrreqs tcp6_usrreqs = {
1224         .pru_abort =            tcp_usr_abort,
1225         .pru_accept =           tcp6_usr_accept,
1226         .pru_attach =           tcp_usr_attach,
1227         .pru_bind =             tcp6_usr_bind,
1228         .pru_connect =          tcp6_usr_connect,
1229         .pru_control =          in6_control,
1230         .pru_detach =           tcp_usr_detach,
1231         .pru_disconnect =       tcp_usr_disconnect,
1232         .pru_listen =           tcp6_usr_listen,
1233         .pru_peeraddr =         in6_mapped_peeraddr,
1234         .pru_rcvd =             tcp_usr_rcvd,
1235         .pru_rcvoob =           tcp_usr_rcvoob,
1236         .pru_send =             tcp_usr_send,
1237         .pru_ready =            tcp_usr_ready,
1238         .pru_shutdown =         tcp_usr_shutdown,
1239         .pru_sockaddr =         in6_mapped_sockaddr,
1240         .pru_sosetlabel =       in_pcbsosetlabel,
1241         .pru_close =            tcp_usr_close,
1242 };
1243 #endif /* INET6 */
1244
1245 #ifdef INET
1246 /*
1247  * Common subroutine to open a TCP connection to remote host specified
1248  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1249  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1250  * to choose a local host address (interface).  If there is an existing
1251  * incarnation of the same connection in TIME-WAIT state and if the remote
1252  * host was sending CC options and if the connection duration was < MSL, then
1253  * truncate the previous TIME-WAIT state and proceed.
1254  * Initialize connection parameters and enter SYN-SENT state.
1255  */
1256 static int
1257 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1258 {
1259         struct inpcb *inp = tp->t_inpcb, *oinp;
1260         struct socket *so = inp->inp_socket;
1261         struct in_addr laddr;
1262         u_short lport;
1263         int error;
1264
1265         INP_WLOCK_ASSERT(inp);
1266         INP_HASH_WLOCK(&V_tcbinfo);
1267
1268         if (inp->inp_lport == 0) {
1269                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1270                 if (error)
1271                         goto out;
1272         }
1273
1274         /*
1275          * Cannot simply call in_pcbconnect, because there might be an
1276          * earlier incarnation of this same connection still in
1277          * TIME_WAIT state, creating an ADDRINUSE error.
1278          */
1279         laddr = inp->inp_laddr;
1280         lport = inp->inp_lport;
1281         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1282             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1283         if (error && oinp == NULL)
1284                 goto out;
1285         if (oinp) {
1286                 error = EADDRINUSE;
1287                 goto out;
1288         }
1289         inp->inp_laddr = laddr;
1290         in_pcbrehash(inp);
1291         INP_HASH_WUNLOCK(&V_tcbinfo);
1292
1293         /*
1294          * Compute window scaling to request:
1295          * Scale to fit into sweet spot.  See tcp_syncache.c.
1296          * XXX: This should move to tcp_output().
1297          */
1298         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1299             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1300                 tp->request_r_scale++;
1301
1302         soisconnecting(so);
1303         TCPSTAT_INC(tcps_connattempt);
1304         tcp_state_change(tp, TCPS_SYN_SENT);
1305         tp->iss = tcp_new_isn(tp);
1306         tcp_sendseqinit(tp);
1307
1308         return 0;
1309
1310 out:
1311         INP_HASH_WUNLOCK(&V_tcbinfo);
1312         return (error);
1313 }
1314 #endif /* INET */
1315
1316 #ifdef INET6
1317 static int
1318 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1319 {
1320         struct inpcb *inp = tp->t_inpcb;
1321         int error;
1322
1323         INP_WLOCK_ASSERT(inp);
1324         INP_HASH_WLOCK(&V_tcbinfo);
1325
1326         if (inp->inp_lport == 0) {
1327                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1328                 if (error)
1329                         goto out;
1330         }
1331         error = in6_pcbconnect(inp, nam, td->td_ucred);
1332         if (error != 0)
1333                 goto out;
1334         INP_HASH_WUNLOCK(&V_tcbinfo);
1335
1336         /* Compute window scaling to request.  */
1337         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1338             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1339                 tp->request_r_scale++;
1340
1341         soisconnecting(inp->inp_socket);
1342         TCPSTAT_INC(tcps_connattempt);
1343         tcp_state_change(tp, TCPS_SYN_SENT);
1344         tp->iss = tcp_new_isn(tp);
1345         tcp_sendseqinit(tp);
1346
1347         return 0;
1348
1349 out:
1350         INP_HASH_WUNLOCK(&V_tcbinfo);
1351         return error;
1352 }
1353 #endif /* INET6 */
1354
1355 /*
1356  * Export TCP internal state information via a struct tcp_info, based on the
1357  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1358  * (TCP state machine, etc).  We export all information using FreeBSD-native
1359  * constants -- for example, the numeric values for tcpi_state will differ
1360  * from Linux.
1361  */
1362 static void
1363 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1364 {
1365
1366         INP_WLOCK_ASSERT(tp->t_inpcb);
1367         bzero(ti, sizeof(*ti));
1368
1369         ti->tcpi_state = tp->t_state;
1370         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1371                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1372         if (tp->t_flags & TF_SACK_PERMIT)
1373                 ti->tcpi_options |= TCPI_OPT_SACK;
1374         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1375                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1376                 ti->tcpi_snd_wscale = tp->snd_scale;
1377                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1378         }
1379         if (tp->t_flags & TF_ECN_PERMIT)
1380                 ti->tcpi_options |= TCPI_OPT_ECN;
1381
1382         ti->tcpi_rto = tp->t_rxtcur * tick;
1383         ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
1384         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1385         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1386
1387         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1388         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1389
1390         /*
1391          * FreeBSD-specific extension fields for tcp_info.
1392          */
1393         ti->tcpi_rcv_space = tp->rcv_wnd;
1394         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1395         ti->tcpi_snd_wnd = tp->snd_wnd;
1396         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1397         ti->tcpi_snd_nxt = tp->snd_nxt;
1398         ti->tcpi_snd_mss = tp->t_maxseg;
1399         ti->tcpi_rcv_mss = tp->t_maxseg;
1400         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1401         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1402         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1403 #ifdef TCP_OFFLOAD
1404         if (tp->t_flags & TF_TOE) {
1405                 ti->tcpi_options |= TCPI_OPT_TOE;
1406                 tcp_offload_tcp_info(tp, ti);
1407         }
1408 #endif
1409 }
1410
1411 /*
1412  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1413  * socket option arguments.  When it re-acquires the lock after the copy, it
1414  * has to revalidate that the connection is still valid for the socket
1415  * option.
1416  */
1417 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do {                    \
1418         INP_WLOCK(inp);                                                 \
1419         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1420                 INP_WUNLOCK(inp);                                       \
1421                 cleanup;                                                \
1422                 return (ECONNRESET);                                    \
1423         }                                                               \
1424         tp = intotcpcb(inp);                                            \
1425 } while(0)
1426 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */)
1427
1428 int
1429 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1430 {
1431         int     error;
1432         struct  inpcb *inp;
1433         struct  tcpcb *tp;
1434         struct tcp_function_block *blk;
1435         struct tcp_function_set fsn;
1436
1437         error = 0;
1438         inp = sotoinpcb(so);
1439         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1440         INP_WLOCK(inp);
1441         if (sopt->sopt_level != IPPROTO_TCP) {
1442 #ifdef INET6
1443                 if (inp->inp_vflag & INP_IPV6PROTO) {
1444                         INP_WUNLOCK(inp);
1445                         error = ip6_ctloutput(so, sopt);
1446                 }
1447 #endif /* INET6 */
1448 #if defined(INET6) && defined(INET)
1449                 else
1450 #endif
1451 #ifdef INET
1452                 {
1453                         INP_WUNLOCK(inp);
1454                         error = ip_ctloutput(so, sopt);
1455                 }
1456 #endif
1457                 return (error);
1458         }
1459         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1460                 INP_WUNLOCK(inp);
1461                 return (ECONNRESET);
1462         }
1463         tp = intotcpcb(inp);
1464         /*
1465          * Protect the TCP option TCP_FUNCTION_BLK so
1466          * that a sub-function can *never* overwrite this.
1467          */
1468         if ((sopt->sopt_dir == SOPT_SET) &&
1469             (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1470                 INP_WUNLOCK(inp);
1471                 error = sooptcopyin(sopt, &fsn, sizeof fsn,
1472                     sizeof fsn);
1473                 if (error)
1474                         return (error);
1475                 INP_WLOCK_RECHECK(inp);
1476                 blk = find_and_ref_tcp_functions(&fsn);
1477                 if (blk == NULL) {
1478                         INP_WUNLOCK(inp);
1479                         return (ENOENT);
1480                 }
1481                 if (tp->t_fb == blk) {
1482                         /* You already have this */
1483                         refcount_release(&blk->tfb_refcnt);
1484                         INP_WUNLOCK(inp);
1485                         return (0);
1486                 }
1487                 if (tp->t_state != TCPS_CLOSED) {
1488                         int error=EINVAL;
1489                         /*
1490                          * The user has advanced the state
1491                          * past the initial point, we may not
1492                          * be able to switch.
1493                          */
1494                         if (blk->tfb_tcp_handoff_ok != NULL) {
1495                                 /*
1496                                  * Does the stack provide a
1497                                  * query mechanism, if so it may
1498                                  * still be possible?
1499                                  */
1500                                 error = (*blk->tfb_tcp_handoff_ok)(tp);
1501                         }
1502                         if (error) {
1503                                 refcount_release(&blk->tfb_refcnt);
1504                                 INP_WUNLOCK(inp);
1505                                 return(error);
1506                         }
1507                 }
1508                 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1509                         refcount_release(&blk->tfb_refcnt);
1510                         INP_WUNLOCK(inp);
1511                         return (ENOENT);
1512                 }
1513                 /*
1514                  * Release the old refcnt, the
1515                  * lookup acquired a ref on the
1516                  * new one already.
1517                  */
1518                 if (tp->t_fb->tfb_tcp_fb_fini) {
1519                         /*
1520                          * Tell the stack to cleanup with 0 i.e.
1521                          * the tcb is not going away.
1522                          */
1523                         (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
1524                 }
1525 #ifdef TCPHPTS
1526                 /* Assure that we are not on any hpts */
1527                 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL);
1528 #endif
1529                 if (blk->tfb_tcp_fb_init) {
1530                         error = (*blk->tfb_tcp_fb_init)(tp);
1531                         if (error) {
1532                                 refcount_release(&blk->tfb_refcnt);
1533                                 if (tp->t_fb->tfb_tcp_fb_init) {
1534                                         if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0)  {
1535                                                 /* Fall back failed, drop the connection */
1536                                                 INP_WUNLOCK(inp);
1537                                                 soabort(so);
1538                                                 return(error);
1539                                         }
1540                                 }
1541                                 goto err_out;
1542                         }
1543                 }
1544                 refcount_release(&tp->t_fb->tfb_refcnt);
1545                 tp->t_fb = blk;
1546 #ifdef TCP_OFFLOAD
1547                 if (tp->t_flags & TF_TOE) {
1548                         tcp_offload_ctloutput(tp, sopt->sopt_dir,
1549                              sopt->sopt_name);
1550                 }
1551 #endif
1552 err_out:
1553                 INP_WUNLOCK(inp);
1554                 return (error);
1555         } else if ((sopt->sopt_dir == SOPT_GET) &&
1556             (sopt->sopt_name == TCP_FUNCTION_BLK)) {
1557                 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name,
1558                     TCP_FUNCTION_NAME_LEN_MAX);
1559                 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
1560                 fsn.pcbcnt = tp->t_fb->tfb_refcnt;
1561                 INP_WUNLOCK(inp);
1562                 error = sooptcopyout(sopt, &fsn, sizeof fsn);
1563                 return (error);
1564         }
1565         /* Pass in the INP locked, called must unlock it */
1566         return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp));
1567 }
1568
1569 /*
1570  * If this assert becomes untrue, we need to change the size of the buf
1571  * variable in tcp_default_ctloutput().
1572  */
1573 #ifdef CTASSERT
1574 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN);
1575 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN);
1576 #endif
1577
1578 int
1579 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp)
1580 {
1581         int     error, opt, optval;
1582         u_int   ui;
1583         struct  tcp_info ti;
1584         struct cc_algo *algo;
1585         char    *pbuf, buf[TCP_LOG_ID_LEN];
1586         size_t  len;
1587
1588         /*
1589          * For TCP_CCALGOOPT forward the control to CC module, for both
1590          * SOPT_SET and SOPT_GET.
1591          */
1592         switch (sopt->sopt_name) {
1593         case TCP_CCALGOOPT:
1594                 INP_WUNLOCK(inp);
1595                 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO);
1596                 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize,
1597                     sopt->sopt_valsize);
1598                 if (error) {
1599                         free(pbuf, M_TEMP);
1600                         return (error);
1601                 }
1602                 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP));
1603                 if (CC_ALGO(tp)->ctl_output != NULL)
1604                         error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf);
1605                 else
1606                         error = ENOENT;
1607                 INP_WUNLOCK(inp);
1608                 if (error == 0 && sopt->sopt_dir == SOPT_GET)
1609                         error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize);
1610                 free(pbuf, M_TEMP);
1611                 return (error);
1612         }
1613
1614         switch (sopt->sopt_dir) {
1615         case SOPT_SET:
1616                 switch (sopt->sopt_name) {
1617 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
1618                 case TCP_MD5SIG:
1619                         if (!TCPMD5_ENABLED()) {
1620                                 INP_WUNLOCK(inp);
1621                                 return (ENOPROTOOPT);
1622                         }
1623                         error = TCPMD5_PCBCTL(inp, sopt);
1624                         if (error)
1625                                 return (error);
1626                         goto unlock_and_done;
1627 #endif /* IPSEC */
1628
1629                 case TCP_NODELAY:
1630                 case TCP_NOOPT:
1631                         INP_WUNLOCK(inp);
1632                         error = sooptcopyin(sopt, &optval, sizeof optval,
1633                             sizeof optval);
1634                         if (error)
1635                                 return (error);
1636
1637                         INP_WLOCK_RECHECK(inp);
1638                         switch (sopt->sopt_name) {
1639                         case TCP_NODELAY:
1640                                 opt = TF_NODELAY;
1641                                 break;
1642                         case TCP_NOOPT:
1643                                 opt = TF_NOOPT;
1644                                 break;
1645                         default:
1646                                 opt = 0; /* dead code to fool gcc */
1647                                 break;
1648                         }
1649
1650                         if (optval)
1651                                 tp->t_flags |= opt;
1652                         else
1653                                 tp->t_flags &= ~opt;
1654 unlock_and_done:
1655 #ifdef TCP_OFFLOAD
1656                         if (tp->t_flags & TF_TOE) {
1657                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1658                                     sopt->sopt_name);
1659                         }
1660 #endif
1661                         INP_WUNLOCK(inp);
1662                         break;
1663
1664                 case TCP_NOPUSH:
1665                         INP_WUNLOCK(inp);
1666                         error = sooptcopyin(sopt, &optval, sizeof optval,
1667                             sizeof optval);
1668                         if (error)
1669                                 return (error);
1670
1671                         INP_WLOCK_RECHECK(inp);
1672                         if (optval)
1673                                 tp->t_flags |= TF_NOPUSH;
1674                         else if (tp->t_flags & TF_NOPUSH) {
1675                                 tp->t_flags &= ~TF_NOPUSH;
1676                                 if (TCPS_HAVEESTABLISHED(tp->t_state))
1677                                         error = tp->t_fb->tfb_tcp_output(tp);
1678                         }
1679                         goto unlock_and_done;
1680
1681                 case TCP_MAXSEG:
1682                         INP_WUNLOCK(inp);
1683                         error = sooptcopyin(sopt, &optval, sizeof optval,
1684                             sizeof optval);
1685                         if (error)
1686                                 return (error);
1687
1688                         INP_WLOCK_RECHECK(inp);
1689                         if (optval > 0 && optval <= tp->t_maxseg &&
1690                             optval + 40 >= V_tcp_minmss)
1691                                 tp->t_maxseg = optval;
1692                         else
1693                                 error = EINVAL;
1694                         goto unlock_and_done;
1695
1696                 case TCP_INFO:
1697                         INP_WUNLOCK(inp);
1698                         error = EINVAL;
1699                         break;
1700
1701                 case TCP_CONGESTION:
1702                         INP_WUNLOCK(inp);
1703                         error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1);
1704                         if (error)
1705                                 break;
1706                         buf[sopt->sopt_valsize] = '\0';
1707                         INP_WLOCK_RECHECK(inp);
1708                         CC_LIST_RLOCK();
1709                         STAILQ_FOREACH(algo, &cc_list, entries)
1710                                 if (strncmp(buf, algo->name,
1711                                     TCP_CA_NAME_MAX) == 0)
1712                                         break;
1713                         CC_LIST_RUNLOCK();
1714                         if (algo == NULL) {
1715                                 INP_WUNLOCK(inp);
1716                                 error = EINVAL;
1717                                 break;
1718                         }
1719                         /*
1720                          * We hold a write lock over the tcb so it's safe to
1721                          * do these things without ordering concerns.
1722                          */
1723                         if (CC_ALGO(tp)->cb_destroy != NULL)
1724                                 CC_ALGO(tp)->cb_destroy(tp->ccv);
1725                         CC_ALGO(tp) = algo;
1726                         /*
1727                          * If something goes pear shaped initialising the new
1728                          * algo, fall back to newreno (which does not
1729                          * require initialisation).
1730                          */
1731                         if (algo->cb_init != NULL &&
1732                             algo->cb_init(tp->ccv) != 0) {
1733                                 CC_ALGO(tp) = &newreno_cc_algo;
1734                                 /*
1735                                  * The only reason init should fail is
1736                                  * because of malloc.
1737                                  */
1738                                 error = ENOMEM;
1739                         }
1740                         INP_WUNLOCK(inp);
1741                         break;
1742
1743                 case TCP_KEEPIDLE:
1744                 case TCP_KEEPINTVL:
1745                 case TCP_KEEPINIT:
1746                         INP_WUNLOCK(inp);
1747                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1748                         if (error)
1749                                 return (error);
1750
1751                         if (ui > (UINT_MAX / hz)) {
1752                                 error = EINVAL;
1753                                 break;
1754                         }
1755                         ui *= hz;
1756
1757                         INP_WLOCK_RECHECK(inp);
1758                         switch (sopt->sopt_name) {
1759                         case TCP_KEEPIDLE:
1760                                 tp->t_keepidle = ui;
1761                                 /*
1762                                  * XXX: better check current remaining
1763                                  * timeout and "merge" it with new value.
1764                                  */
1765                                 if ((tp->t_state > TCPS_LISTEN) &&
1766                                     (tp->t_state <= TCPS_CLOSING))
1767                                         tcp_timer_activate(tp, TT_KEEP,
1768                                             TP_KEEPIDLE(tp));
1769                                 break;
1770                         case TCP_KEEPINTVL:
1771                                 tp->t_keepintvl = ui;
1772                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1773                                     (TP_MAXIDLE(tp) > 0))
1774                                         tcp_timer_activate(tp, TT_2MSL,
1775                                             TP_MAXIDLE(tp));
1776                                 break;
1777                         case TCP_KEEPINIT:
1778                                 tp->t_keepinit = ui;
1779                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
1780                                     tp->t_state == TCPS_SYN_SENT)
1781                                         tcp_timer_activate(tp, TT_KEEP,
1782                                             TP_KEEPINIT(tp));
1783                                 break;
1784                         }
1785                         goto unlock_and_done;
1786
1787                 case TCP_KEEPCNT:
1788                         INP_WUNLOCK(inp);
1789                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1790                         if (error)
1791                                 return (error);
1792
1793                         INP_WLOCK_RECHECK(inp);
1794                         tp->t_keepcnt = ui;
1795                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1796                             (TP_MAXIDLE(tp) > 0))
1797                                 tcp_timer_activate(tp, TT_2MSL,
1798                                     TP_MAXIDLE(tp));
1799                         goto unlock_and_done;
1800
1801 #ifdef TCPPCAP
1802                 case TCP_PCAP_OUT:
1803                 case TCP_PCAP_IN:
1804                         INP_WUNLOCK(inp);
1805                         error = sooptcopyin(sopt, &optval, sizeof optval,
1806                             sizeof optval);
1807                         if (error)
1808                                 return (error);
1809
1810                         INP_WLOCK_RECHECK(inp);
1811                         if (optval >= 0)
1812                                 tcp_pcap_set_sock_max(TCP_PCAP_OUT ?
1813                                         &(tp->t_outpkts) : &(tp->t_inpkts),
1814                                         optval);
1815                         else
1816                                 error = EINVAL;
1817                         goto unlock_and_done;
1818 #endif
1819
1820                 case TCP_FASTOPEN: {
1821                         struct tcp_fastopen tfo_optval;
1822
1823                         INP_WUNLOCK(inp);
1824                         if (!V_tcp_fastopen_client_enable &&
1825                             !V_tcp_fastopen_server_enable)
1826                                 return (EPERM);
1827
1828                         error = sooptcopyin(sopt, &tfo_optval,
1829                                     sizeof(tfo_optval), sizeof(int));
1830                         if (error)
1831                                 return (error);
1832
1833                         INP_WLOCK_RECHECK(inp);
1834                         if (tfo_optval.enable) {
1835                                 if (tp->t_state == TCPS_LISTEN) {
1836                                         if (!V_tcp_fastopen_server_enable) {
1837                                                 error = EPERM;
1838                                                 goto unlock_and_done;
1839                                         }
1840
1841                                         tp->t_flags |= TF_FASTOPEN;
1842                                         if (tp->t_tfo_pending == NULL)
1843                                                 tp->t_tfo_pending =
1844                                                     tcp_fastopen_alloc_counter();
1845                                 } else {
1846                                         /*
1847                                          * If a pre-shared key was provided,
1848                                          * stash it in the client cookie
1849                                          * field of the tcpcb for use during
1850                                          * connect.
1851                                          */
1852                                         if (sopt->sopt_valsize ==
1853                                             sizeof(tfo_optval)) {
1854                                                 memcpy(tp->t_tfo_cookie.client,
1855                                                        tfo_optval.psk,
1856                                                        TCP_FASTOPEN_PSK_LEN);
1857                                                 tp->t_tfo_client_cookie_len =
1858                                                     TCP_FASTOPEN_PSK_LEN;
1859                                         }
1860                                         tp->t_flags |= TF_FASTOPEN;
1861                                 }
1862                         } else
1863                                 tp->t_flags &= ~TF_FASTOPEN;
1864                         goto unlock_and_done;
1865                 }
1866
1867 #ifdef TCP_BLACKBOX
1868                 case TCP_LOG:
1869                         INP_WUNLOCK(inp);
1870                         error = sooptcopyin(sopt, &optval, sizeof optval,
1871                             sizeof optval);
1872                         if (error)
1873                                 return (error);
1874
1875                         INP_WLOCK_RECHECK(inp);
1876                         error = tcp_log_state_change(tp, optval);
1877                         goto unlock_and_done;
1878
1879                 case TCP_LOGBUF:
1880                         INP_WUNLOCK(inp);
1881                         error = EINVAL;
1882                         break;
1883
1884                 case TCP_LOGID:
1885                         INP_WUNLOCK(inp);
1886                         error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0);
1887                         if (error)
1888                                 break;
1889                         buf[sopt->sopt_valsize] = '\0';
1890                         INP_WLOCK_RECHECK(inp);
1891                         error = tcp_log_set_id(tp, buf);
1892                         /* tcp_log_set_id() unlocks the INP. */
1893                         break;
1894
1895                 case TCP_LOGDUMP:
1896                 case TCP_LOGDUMPID:
1897                         INP_WUNLOCK(inp);
1898                         error =
1899                             sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0);
1900                         if (error)
1901                                 break;
1902                         buf[sopt->sopt_valsize] = '\0';
1903                         INP_WLOCK_RECHECK(inp);
1904                         if (sopt->sopt_name == TCP_LOGDUMP) {
1905                                 error = tcp_log_dump_tp_logbuf(tp, buf,
1906                                     M_WAITOK, true);
1907                                 INP_WUNLOCK(inp);
1908                         } else {
1909                                 tcp_log_dump_tp_bucket_logbufs(tp, buf);
1910                                 /*
1911                                  * tcp_log_dump_tp_bucket_logbufs() drops the
1912                                  * INP lock.
1913                                  */
1914                         }
1915                         break;
1916 #endif
1917
1918                 default:
1919                         INP_WUNLOCK(inp);
1920                         error = ENOPROTOOPT;
1921                         break;
1922                 }
1923                 break;
1924
1925         case SOPT_GET:
1926                 tp = intotcpcb(inp);
1927                 switch (sopt->sopt_name) {
1928 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
1929                 case TCP_MD5SIG:
1930                         if (!TCPMD5_ENABLED()) {
1931                                 INP_WUNLOCK(inp);
1932                                 return (ENOPROTOOPT);
1933                         }
1934                         error = TCPMD5_PCBCTL(inp, sopt);
1935                         break;
1936 #endif
1937
1938                 case TCP_NODELAY:
1939                         optval = tp->t_flags & TF_NODELAY;
1940                         INP_WUNLOCK(inp);
1941                         error = sooptcopyout(sopt, &optval, sizeof optval);
1942                         break;
1943                 case TCP_MAXSEG:
1944                         optval = tp->t_maxseg;
1945                         INP_WUNLOCK(inp);
1946                         error = sooptcopyout(sopt, &optval, sizeof optval);
1947                         break;
1948                 case TCP_NOOPT:
1949                         optval = tp->t_flags & TF_NOOPT;
1950                         INP_WUNLOCK(inp);
1951                         error = sooptcopyout(sopt, &optval, sizeof optval);
1952                         break;
1953                 case TCP_NOPUSH:
1954                         optval = tp->t_flags & TF_NOPUSH;
1955                         INP_WUNLOCK(inp);
1956                         error = sooptcopyout(sopt, &optval, sizeof optval);
1957                         break;
1958                 case TCP_INFO:
1959                         tcp_fill_info(tp, &ti);
1960                         INP_WUNLOCK(inp);
1961                         error = sooptcopyout(sopt, &ti, sizeof ti);
1962                         break;
1963                 case TCP_CONGESTION:
1964                         len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
1965                         INP_WUNLOCK(inp);
1966                         error = sooptcopyout(sopt, buf, len + 1);
1967                         break;
1968                 case TCP_KEEPIDLE:
1969                 case TCP_KEEPINTVL:
1970                 case TCP_KEEPINIT:
1971                 case TCP_KEEPCNT:
1972                         switch (sopt->sopt_name) {
1973                         case TCP_KEEPIDLE:
1974                                 ui = TP_KEEPIDLE(tp) / hz;
1975                                 break;
1976                         case TCP_KEEPINTVL:
1977                                 ui = TP_KEEPINTVL(tp) / hz;
1978                                 break;
1979                         case TCP_KEEPINIT:
1980                                 ui = TP_KEEPINIT(tp) / hz;
1981                                 break;
1982                         case TCP_KEEPCNT:
1983                                 ui = TP_KEEPCNT(tp);
1984                                 break;
1985                         }
1986                         INP_WUNLOCK(inp);
1987                         error = sooptcopyout(sopt, &ui, sizeof(ui));
1988                         break;
1989 #ifdef TCPPCAP
1990                 case TCP_PCAP_OUT:
1991                 case TCP_PCAP_IN:
1992                         optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ?
1993                                         &(tp->t_outpkts) : &(tp->t_inpkts));
1994                         INP_WUNLOCK(inp);
1995                         error = sooptcopyout(sopt, &optval, sizeof optval);
1996                         break;
1997 #endif
1998                 case TCP_FASTOPEN:
1999                         optval = tp->t_flags & TF_FASTOPEN;
2000                         INP_WUNLOCK(inp);
2001                         error = sooptcopyout(sopt, &optval, sizeof optval);
2002                         break;
2003 #ifdef TCP_BLACKBOX
2004                 case TCP_LOG:
2005                         optval = tp->t_logstate;
2006                         INP_WUNLOCK(inp);
2007                         error = sooptcopyout(sopt, &optval, sizeof(optval));
2008                         break;
2009                 case TCP_LOGBUF:
2010                         /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */
2011                         error = tcp_log_getlogbuf(sopt, tp);
2012                         break;
2013                 case TCP_LOGID:
2014                         len = tcp_log_get_id(tp, buf);
2015                         INP_WUNLOCK(inp);
2016                         error = sooptcopyout(sopt, buf, len + 1);
2017                         break;
2018                 case TCP_LOGDUMP:
2019                 case TCP_LOGDUMPID:
2020                         INP_WUNLOCK(inp);
2021                         error = EINVAL;
2022                         break;
2023 #endif
2024                 default:
2025                         INP_WUNLOCK(inp);
2026                         error = ENOPROTOOPT;
2027                         break;
2028                 }
2029                 break;
2030         }
2031         return (error);
2032 }
2033 #undef INP_WLOCK_RECHECK
2034 #undef INP_WLOCK_RECHECK_CLEANUP
2035
2036 /*
2037  * Attach TCP protocol to socket, allocating
2038  * internet protocol control block, tcp control block,
2039  * bufer space, and entering LISTEN state if to accept connections.
2040  */
2041 static int
2042 tcp_attach(struct socket *so)
2043 {
2044         struct tcpcb *tp;
2045         struct inpcb *inp;
2046         int error;
2047
2048         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
2049                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
2050                 if (error)
2051                         return (error);
2052         }
2053         so->so_rcv.sb_flags |= SB_AUTOSIZE;
2054         so->so_snd.sb_flags |= SB_AUTOSIZE;
2055         INP_INFO_RLOCK(&V_tcbinfo);
2056         error = in_pcballoc(so, &V_tcbinfo);
2057         if (error) {
2058                 INP_INFO_RUNLOCK(&V_tcbinfo);
2059                 return (error);
2060         }
2061         inp = sotoinpcb(so);
2062 #ifdef INET6
2063         if (inp->inp_vflag & INP_IPV6PROTO) {
2064                 inp->inp_vflag |= INP_IPV6;
2065                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
2066                         inp->inp_vflag |= INP_IPV4;
2067                 inp->in6p_hops = -1;    /* use kernel default */
2068         }
2069         else
2070 #endif
2071         inp->inp_vflag |= INP_IPV4;
2072         tp = tcp_newtcpcb(inp);
2073         if (tp == NULL) {
2074                 in_pcbdetach(inp);
2075                 in_pcbfree(inp);
2076                 INP_INFO_RUNLOCK(&V_tcbinfo);
2077                 return (ENOBUFS);
2078         }
2079         tp->t_state = TCPS_CLOSED;
2080         INP_WUNLOCK(inp);
2081         INP_INFO_RUNLOCK(&V_tcbinfo);
2082         TCPSTATES_INC(TCPS_CLOSED);
2083         return (0);
2084 }
2085
2086 /*
2087  * Initiate (or continue) disconnect.
2088  * If embryonic state, just send reset (once).
2089  * If in ``let data drain'' option and linger null, just drop.
2090  * Otherwise (hard), mark socket disconnecting and drop
2091  * current input data; switch states based on user close, and
2092  * send segment to peer (with FIN).
2093  */
2094 static void
2095 tcp_disconnect(struct tcpcb *tp)
2096 {
2097         struct inpcb *inp = tp->t_inpcb;
2098         struct socket *so = inp->inp_socket;
2099
2100         INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
2101         INP_WLOCK_ASSERT(inp);
2102
2103         /*
2104          * Neither tcp_close() nor tcp_drop() should return NULL, as the
2105          * socket is still open.
2106          */
2107         if (tp->t_state < TCPS_ESTABLISHED) {
2108                 tp = tcp_close(tp);
2109                 KASSERT(tp != NULL,
2110                     ("tcp_disconnect: tcp_close() returned NULL"));
2111         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
2112                 tp = tcp_drop(tp, 0);
2113                 KASSERT(tp != NULL,
2114                     ("tcp_disconnect: tcp_drop() returned NULL"));
2115         } else {
2116                 soisdisconnecting(so);
2117                 sbflush(&so->so_rcv);
2118                 tcp_usrclosed(tp);
2119                 if (!(inp->inp_flags & INP_DROPPED))
2120                         tp->t_fb->tfb_tcp_output(tp);
2121         }
2122 }
2123
2124 /*
2125  * User issued close, and wish to trail through shutdown states:
2126  * if never received SYN, just forget it.  If got a SYN from peer,
2127  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
2128  * If already got a FIN from peer, then almost done; go to LAST_ACK
2129  * state.  In all other cases, have already sent FIN to peer (e.g.
2130  * after PRU_SHUTDOWN), and just have to play tedious game waiting
2131  * for peer to send FIN or not respond to keep-alives, etc.
2132  * We can let the user exit from the close as soon as the FIN is acked.
2133  */
2134 static void
2135 tcp_usrclosed(struct tcpcb *tp)
2136 {
2137
2138         INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
2139         INP_WLOCK_ASSERT(tp->t_inpcb);
2140
2141         switch (tp->t_state) {
2142         case TCPS_LISTEN:
2143 #ifdef TCP_OFFLOAD
2144                 tcp_offload_listen_stop(tp);
2145 #endif
2146                 tcp_state_change(tp, TCPS_CLOSED);
2147                 /* FALLTHROUGH */
2148         case TCPS_CLOSED:
2149                 tp = tcp_close(tp);
2150                 /*
2151                  * tcp_close() should never return NULL here as the socket is
2152                  * still open.
2153                  */
2154                 KASSERT(tp != NULL,
2155                     ("tcp_usrclosed: tcp_close() returned NULL"));
2156                 break;
2157
2158         case TCPS_SYN_SENT:
2159         case TCPS_SYN_RECEIVED:
2160                 tp->t_flags |= TF_NEEDFIN;
2161                 break;
2162
2163         case TCPS_ESTABLISHED:
2164                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
2165                 break;
2166
2167         case TCPS_CLOSE_WAIT:
2168                 tcp_state_change(tp, TCPS_LAST_ACK);
2169                 break;
2170         }
2171         if (tp->t_state >= TCPS_FIN_WAIT_2) {
2172                 soisdisconnected(tp->t_inpcb->inp_socket);
2173                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
2174                 if (tp->t_state == TCPS_FIN_WAIT_2) {
2175                         int timeout;
2176
2177                         timeout = (tcp_fast_finwait2_recycle) ?
2178                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
2179                         tcp_timer_activate(tp, TT_2MSL, timeout);
2180                 }
2181         }
2182 }
2183
2184 #ifdef DDB
2185 static void
2186 db_print_indent(int indent)
2187 {
2188         int i;
2189
2190         for (i = 0; i < indent; i++)
2191                 db_printf(" ");
2192 }
2193
2194 static void
2195 db_print_tstate(int t_state)
2196 {
2197
2198         switch (t_state) {
2199         case TCPS_CLOSED:
2200                 db_printf("TCPS_CLOSED");
2201                 return;
2202
2203         case TCPS_LISTEN:
2204                 db_printf("TCPS_LISTEN");
2205                 return;
2206
2207         case TCPS_SYN_SENT:
2208                 db_printf("TCPS_SYN_SENT");
2209                 return;
2210
2211         case TCPS_SYN_RECEIVED:
2212                 db_printf("TCPS_SYN_RECEIVED");
2213                 return;
2214
2215         case TCPS_ESTABLISHED:
2216                 db_printf("TCPS_ESTABLISHED");
2217                 return;
2218
2219         case TCPS_CLOSE_WAIT:
2220                 db_printf("TCPS_CLOSE_WAIT");
2221                 return;
2222
2223         case TCPS_FIN_WAIT_1:
2224                 db_printf("TCPS_FIN_WAIT_1");
2225                 return;
2226
2227         case TCPS_CLOSING:
2228                 db_printf("TCPS_CLOSING");
2229                 return;
2230
2231         case TCPS_LAST_ACK:
2232                 db_printf("TCPS_LAST_ACK");
2233                 return;
2234
2235         case TCPS_FIN_WAIT_2:
2236                 db_printf("TCPS_FIN_WAIT_2");
2237                 return;
2238
2239         case TCPS_TIME_WAIT:
2240                 db_printf("TCPS_TIME_WAIT");
2241                 return;
2242
2243         default:
2244                 db_printf("unknown");
2245                 return;
2246         }
2247 }
2248
2249 static void
2250 db_print_tflags(u_int t_flags)
2251 {
2252         int comma;
2253
2254         comma = 0;
2255         if (t_flags & TF_ACKNOW) {
2256                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
2257                 comma = 1;
2258         }
2259         if (t_flags & TF_DELACK) {
2260                 db_printf("%sTF_DELACK", comma ? ", " : "");
2261                 comma = 1;
2262         }
2263         if (t_flags & TF_NODELAY) {
2264                 db_printf("%sTF_NODELAY", comma ? ", " : "");
2265                 comma = 1;
2266         }
2267         if (t_flags & TF_NOOPT) {
2268                 db_printf("%sTF_NOOPT", comma ? ", " : "");
2269                 comma = 1;
2270         }
2271         if (t_flags & TF_SENTFIN) {
2272                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
2273                 comma = 1;
2274         }
2275         if (t_flags & TF_REQ_SCALE) {
2276                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
2277                 comma = 1;
2278         }
2279         if (t_flags & TF_RCVD_SCALE) {
2280                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
2281                 comma = 1;
2282         }
2283         if (t_flags & TF_REQ_TSTMP) {
2284                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
2285                 comma = 1;
2286         }
2287         if (t_flags & TF_RCVD_TSTMP) {
2288                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
2289                 comma = 1;
2290         }
2291         if (t_flags & TF_SACK_PERMIT) {
2292                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
2293                 comma = 1;
2294         }
2295         if (t_flags & TF_NEEDSYN) {
2296                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
2297                 comma = 1;
2298         }
2299         if (t_flags & TF_NEEDFIN) {
2300                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
2301                 comma = 1;
2302         }
2303         if (t_flags & TF_NOPUSH) {
2304                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
2305                 comma = 1;
2306         }
2307         if (t_flags & TF_MORETOCOME) {
2308                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
2309                 comma = 1;
2310         }
2311         if (t_flags & TF_LQ_OVERFLOW) {
2312                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
2313                 comma = 1;
2314         }
2315         if (t_flags & TF_LASTIDLE) {
2316                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
2317                 comma = 1;
2318         }
2319         if (t_flags & TF_RXWIN0SENT) {
2320                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
2321                 comma = 1;
2322         }
2323         if (t_flags & TF_FASTRECOVERY) {
2324                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
2325                 comma = 1;
2326         }
2327         if (t_flags & TF_CONGRECOVERY) {
2328                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
2329                 comma = 1;
2330         }
2331         if (t_flags & TF_WASFRECOVERY) {
2332                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
2333                 comma = 1;
2334         }
2335         if (t_flags & TF_SIGNATURE) {
2336                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
2337                 comma = 1;
2338         }
2339         if (t_flags & TF_FORCEDATA) {
2340                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
2341                 comma = 1;
2342         }
2343         if (t_flags & TF_TSO) {
2344                 db_printf("%sTF_TSO", comma ? ", " : "");
2345                 comma = 1;
2346         }
2347         if (t_flags & TF_ECN_PERMIT) {
2348                 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
2349                 comma = 1;
2350         }
2351         if (t_flags & TF_FASTOPEN) {
2352                 db_printf("%sTF_FASTOPEN", comma ? ", " : "");
2353                 comma = 1;
2354         }
2355 }
2356
2357 static void
2358 db_print_toobflags(char t_oobflags)
2359 {
2360         int comma;
2361
2362         comma = 0;
2363         if (t_oobflags & TCPOOB_HAVEDATA) {
2364                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
2365                 comma = 1;
2366         }
2367         if (t_oobflags & TCPOOB_HADDATA) {
2368                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
2369                 comma = 1;
2370         }
2371 }
2372
2373 static void
2374 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
2375 {
2376
2377         db_print_indent(indent);
2378         db_printf("%s at %p\n", name, tp);
2379
2380         indent += 2;
2381
2382         db_print_indent(indent);
2383         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
2384            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
2385
2386         db_print_indent(indent);
2387         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
2388             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
2389
2390         db_print_indent(indent);
2391         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
2392             &tp->t_timers->tt_delack, tp->t_inpcb);
2393
2394         db_print_indent(indent);
2395         db_printf("t_state: %d (", tp->t_state);
2396         db_print_tstate(tp->t_state);
2397         db_printf(")\n");
2398
2399         db_print_indent(indent);
2400         db_printf("t_flags: 0x%x (", tp->t_flags);
2401         db_print_tflags(tp->t_flags);
2402         db_printf(")\n");
2403
2404         db_print_indent(indent);
2405         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
2406             tp->snd_una, tp->snd_max, tp->snd_nxt);
2407
2408         db_print_indent(indent);
2409         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
2410            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
2411
2412         db_print_indent(indent);
2413         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
2414             tp->iss, tp->irs, tp->rcv_nxt);
2415
2416         db_print_indent(indent);
2417         db_printf("rcv_adv: 0x%08x   rcv_wnd: %u   rcv_up: 0x%08x\n",
2418             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
2419
2420         db_print_indent(indent);
2421         db_printf("snd_wnd: %u   snd_cwnd: %u\n",
2422            tp->snd_wnd, tp->snd_cwnd);
2423
2424         db_print_indent(indent);
2425         db_printf("snd_ssthresh: %u   snd_recover: "
2426             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
2427
2428         db_print_indent(indent);
2429         db_printf("t_rcvtime: %u   t_startime: %u\n",
2430             tp->t_rcvtime, tp->t_starttime);
2431
2432         db_print_indent(indent);
2433         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
2434             tp->t_rtttime, tp->t_rtseq);
2435
2436         db_print_indent(indent);
2437         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
2438             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
2439
2440         db_print_indent(indent);
2441         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
2442             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
2443             tp->t_rttbest);
2444
2445         db_print_indent(indent);
2446         db_printf("t_rttupdated: %lu   max_sndwnd: %u   t_softerror: %d\n",
2447             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2448
2449         db_print_indent(indent);
2450         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2451         db_print_toobflags(tp->t_oobflags);
2452         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
2453
2454         db_print_indent(indent);
2455         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
2456             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2457
2458         db_print_indent(indent);
2459         db_printf("ts_recent: %u   ts_recent_age: %u\n",
2460             tp->ts_recent, tp->ts_recent_age);
2461
2462         db_print_indent(indent);
2463         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
2464             "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2465
2466         db_print_indent(indent);
2467         db_printf("snd_ssthresh_prev: %u   snd_recover_prev: 0x%08x   "
2468             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2469             tp->snd_recover_prev, tp->t_badrxtwin);
2470
2471         db_print_indent(indent);
2472         db_printf("snd_numholes: %d  snd_holes first: %p\n",
2473             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2474
2475         db_print_indent(indent);
2476         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
2477             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
2478
2479         /* Skip sackblks, sackhint. */
2480
2481         db_print_indent(indent);
2482         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
2483             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2484 }
2485
2486 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2487 {
2488         struct tcpcb *tp;
2489
2490         if (!have_addr) {
2491                 db_printf("usage: show tcpcb <addr>\n");
2492                 return;
2493         }
2494         tp = (struct tcpcb *)addr;
2495
2496         db_print_tcpcb(tp, "tcpcb", 0);
2497 }
2498 #endif