sys/netinet/tcp_usrreq.c

   1 /*-
   2  * Copyright (c) 1982, 1986, 1988, 1993
   3  *      The Regents of the University of California.
   4  * Copyright (c) 2006-2007 Robert N. M. Watson
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      From: @(#)tcp_usrreq.c  8.2 (Berkeley) 1/3/94
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include "opt_ddb.h"
  38 #include "opt_inet.h"
  39 #include "opt_inet6.h"
  40 #include "opt_tcpdebug.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/malloc.h>
  45 #include <sys/kernel.h>
  46 #include <sys/sysctl.h>
  47 #include <sys/mbuf.h>
  48 #ifdef INET6
  49 #include <sys/domain.h>
  50 #endif /* INET6 */
  51 #include <sys/socket.h>
  52 #include <sys/socketvar.h>
  53 #include <sys/protosw.h>
  54 #include <sys/proc.h>
  55 #include <sys/jail.h>
  56
  57 #ifdef DDB
  58 #include <ddb/ddb.h>
  59 #endif
  60
  61 #include <net/if.h>
  62 #include <net/route.h>
  63 #include <net/vnet.h>
  64
  65 #include <netinet/in.h>
  66 #include <netinet/in_systm.h>
  67 #ifdef INET6
  68 #include <netinet/ip6.h>
  69 #endif
  70 #include <netinet/in_pcb.h>
  71 #ifdef INET6
  72 #include <netinet6/in6_pcb.h>
  73 #endif
  74 #include <netinet/in_var.h>
  75 #include <netinet/ip_var.h>
  76 #ifdef INET6
  77 #include <netinet6/ip6_var.h>
  78 #include <netinet6/scope6_var.h>
  79 #endif
  80 #include <netinet/tcp.h>
  81 #include <netinet/tcp_fsm.h>
  82 #include <netinet/tcp_seq.h>
  83 #include <netinet/tcp_timer.h>
  84 #include <netinet/tcp_var.h>
  85 #include <netinet/tcpip.h>
  86 #ifdef TCPDEBUG
  87 #include <netinet/tcp_debug.h>
  88 #endif
  89 #include <netinet/tcp_offload.h>
  90
  91 /*
  92  * TCP protocol interface to socket abstraction.
  93  */
  94 static int      tcp_attach(struct socket *);
  95 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
  96                     struct thread *td);
  97 #ifdef INET6
  98 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
  99                     struct thread *td);
 100 #endif /* INET6 */
 101 static void     tcp_disconnect(struct tcpcb *);
 102 static void     tcp_usrclosed(struct tcpcb *);
 103 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 104
 105 #ifdef TCPDEBUG
 106 #define TCPDEBUG0       int ostate = 0
 107 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 108 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 109                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 110 #else
 111 #define TCPDEBUG0
 112 #define TCPDEBUG1()
 113 #define TCPDEBUG2(req)
 114 #endif
 115
 116 /*
 117  * TCP attaches to socket via pru_attach(), reserving space,
 118  * and an internet control block.
 119  */
 120 static int
 121 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 122 {
 123         struct inpcb *inp;
 124         struct tcpcb *tp = NULL;
 125         int error;
 126         TCPDEBUG0;
 127
 128         inp = sotoinpcb(so);
 129         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 130         TCPDEBUG1();
 131
 132         error = tcp_attach(so);
 133         if (error)
 134                 goto out;
 135
 136         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 137                 so->so_linger = TCP_LINGERTIME;
 138
 139         inp = sotoinpcb(so);
 140         tp = intotcpcb(inp);
 141 out:
 142         TCPDEBUG2(PRU_ATTACH);
 143         return error;
 144 }
 145
 146 /*
 147  * tcp_detach is called when the socket layer loses its final reference
 148  * to the socket, be it a file descriptor reference, a reference from TCP,
 149  * etc.  At this point, there is only one case in which we will keep around
 150  * inpcb state: time wait.
 151  *
 152  * This function can probably be re-absorbed back into tcp_usr_detach() now
 153  * that there is a single detach path.
 154  */
 155 static void
 156 tcp_detach(struct socket *so, struct inpcb *inp)
 157 {
 158         struct tcpcb *tp;
 159
 160         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 161         INP_WLOCK_ASSERT(inp);
 162
 163         KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
 164         KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
 165
 166         tp = intotcpcb(inp);
 167
 168         if (inp->inp_flags & INP_TIMEWAIT) {
 169                 /*
 170                  * There are two cases to handle: one in which the time wait
 171                  * state is being discarded (INP_DROPPED), and one in which
 172                  * this connection will remain in timewait.  In the former,
 173                  * it is time to discard all state (except tcptw, which has
 174                  * already been discarded by the timewait close code, which
 175                  * should be further up the call stack somewhere).  In the
 176                  * latter case, we detach from the socket, but leave the pcb
 177                  * present until timewait ends.
 178                  *
 179                  * XXXRW: Would it be cleaner to free the tcptw here?
 180                  */
 181                 if (inp->inp_flags & INP_DROPPED) {
 182                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 183                             "INP_DROPPED && tp != NULL"));
 184                         in_pcbdetach(inp);
 185                         in_pcbfree(inp);
 186                 } else {
 187                         in_pcbdetach(inp);
 188                         INP_WUNLOCK(inp);
 189                 }
 190         } else {
 191                 /*
 192                  * If the connection is not in timewait, we consider two
 193                  * two conditions: one in which no further processing is
 194                  * necessary (dropped || embryonic), and one in which TCP is
 195                  * not yet done, but no longer requires the socket, so the
 196                  * pcb will persist for the time being.
 197                  *
 198                  * XXXRW: Does the second case still occur?
 199                  */
 200                 if (inp->inp_flags & INP_DROPPED ||
 201                     tp->t_state < TCPS_SYN_SENT) {
 202                         tcp_discardcb(tp);
 203                         in_pcbdetach(inp);
 204                         in_pcbfree(inp);
 205                 } else
 206                         in_pcbdetach(inp);
 207         }
 208 }
 209
 210 /*
 211  * pru_detach() detaches the TCP protocol from the socket.
 212  * If the protocol state is non-embryonic, then can't
 213  * do this directly: have to initiate a pru_disconnect(),
 214  * which may finish later; embryonic TCB's can just
 215  * be discarded here.
 216  */
 217 static void
 218 tcp_usr_detach(struct socket *so)
 219 {
 220         struct inpcb *inp;
 221
 222         inp = sotoinpcb(so);
 223         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
 224         INP_INFO_WLOCK(&V_tcbinfo);
 225         INP_WLOCK(inp);
 226         KASSERT(inp->inp_socket != NULL,
 227             ("tcp_usr_detach: inp_socket == NULL"));
 228         tcp_detach(so, inp);
 229         INP_INFO_WUNLOCK(&V_tcbinfo);
 230 }
 231
 232 /*
 233  * Give the socket an address.
 234  */
 235 static int
 236 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 237 {
 238         int error = 0;
 239         struct inpcb *inp;
 240         struct tcpcb *tp = NULL;
 241         struct sockaddr_in *sinp;
 242
 243         sinp = (struct sockaddr_in *)nam;
 244         if (nam->sa_len != sizeof (*sinp))
 245                 return (EINVAL);
 246         /*
 247          * Must check for multicast addresses and disallow binding
 248          * to them.
 249          */
 250         if (sinp->sin_family == AF_INET &&
 251             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 252                 return (EAFNOSUPPORT);
 253
 254         TCPDEBUG0;
 255         INP_INFO_WLOCK(&V_tcbinfo);
 256         inp = sotoinpcb(so);
 257         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 258         INP_WLOCK(inp);
 259         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 260                 error = EINVAL;
 261                 goto out;
 262         }
 263         tp = intotcpcb(inp);
 264         TCPDEBUG1();
 265         error = in_pcbbind(inp, nam, td->td_ucred);
 266 out:
 267         TCPDEBUG2(PRU_BIND);
 268         INP_WUNLOCK(inp);
 269         INP_INFO_WUNLOCK(&V_tcbinfo);
 270
 271         return (error);
 272 }
 273
 274 #ifdef INET6
 275 static int
 276 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 277 {
 278         int error = 0;
 279         struct inpcb *inp;
 280         struct tcpcb *tp = NULL;
 281         struct sockaddr_in6 *sin6p;
 282
 283         sin6p = (struct sockaddr_in6 *)nam;
 284         if (nam->sa_len != sizeof (*sin6p))
 285                 return (EINVAL);
 286         /*
 287          * Must check for multicast addresses and disallow binding
 288          * to them.
 289          */
 290         if (sin6p->sin6_family == AF_INET6 &&
 291             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 292                 return (EAFNOSUPPORT);
 293
 294         TCPDEBUG0;
 295         INP_INFO_WLOCK(&V_tcbinfo);
 296         inp = sotoinpcb(so);
 297         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 298         INP_WLOCK(inp);
 299         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 300                 error = EINVAL;
 301                 goto out;
 302         }
 303         tp = intotcpcb(inp);
 304         TCPDEBUG1();
 305         inp->inp_vflag &= ~INP_IPV4;
 306         inp->inp_vflag |= INP_IPV6;
 307         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 308                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 309                         inp->inp_vflag |= INP_IPV4;
 310                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 311                         struct sockaddr_in sin;
 312
 313                         in6_sin6_2_sin(&sin, sin6p);
 314                         inp->inp_vflag |= INP_IPV4;
 315                         inp->inp_vflag &= ~INP_IPV6;
 316                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 317                             td->td_ucred);
 318                         goto out;
 319                 }
 320         }
 321         error = in6_pcbbind(inp, nam, td->td_ucred);
 322 out:
 323         TCPDEBUG2(PRU_BIND);
 324         INP_WUNLOCK(inp);
 325         INP_INFO_WUNLOCK(&V_tcbinfo);
 326         return (error);
 327 }
 328 #endif /* INET6 */
 329
 330 /*
 331  * Prepare to accept connections.
 332  */
 333 static int
 334 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 335 {
 336         int error = 0;
 337         struct inpcb *inp;
 338         struct tcpcb *tp = NULL;
 339
 340         TCPDEBUG0;
 341         INP_INFO_WLOCK(&V_tcbinfo);
 342         inp = sotoinpcb(so);
 343         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 344         INP_WLOCK(inp);
 345         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 346                 error = EINVAL;
 347                 goto out;
 348         }
 349         tp = intotcpcb(inp);
 350         TCPDEBUG1();
 351         SOCK_LOCK(so);
 352         error = solisten_proto_check(so);
 353         if (error == 0 && inp->inp_lport == 0)
 354                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 355         if (error == 0) {
 356                 tp->t_state = TCPS_LISTEN;
 357                 solisten_proto(so, backlog);
 358                 tcp_offload_listen_open(tp);
 359         }
 360         SOCK_UNLOCK(so);
 361
 362 out:
 363         TCPDEBUG2(PRU_LISTEN);
 364         INP_WUNLOCK(inp);
 365         INP_INFO_WUNLOCK(&V_tcbinfo);
 366         return (error);
 367 }
 368
 369 #ifdef INET6
 370 static int
 371 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 372 {
 373         int error = 0;
 374         struct inpcb *inp;
 375         struct tcpcb *tp = NULL;
 376
 377         TCPDEBUG0;
 378         INP_INFO_WLOCK(&V_tcbinfo);
 379         inp = sotoinpcb(so);
 380         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 381         INP_WLOCK(inp);
 382         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 383                 error = EINVAL;
 384                 goto out;
 385         }
 386         tp = intotcpcb(inp);
 387         TCPDEBUG1();
 388         SOCK_LOCK(so);
 389         error = solisten_proto_check(so);
 390         if (error == 0 && inp->inp_lport == 0) {
 391                 inp->inp_vflag &= ~INP_IPV4;
 392                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 393                         inp->inp_vflag |= INP_IPV4;
 394                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 395         }
 396         if (error == 0) {
 397                 tp->t_state = TCPS_LISTEN;
 398                 solisten_proto(so, backlog);
 399         }
 400         SOCK_UNLOCK(so);
 401
 402 out:
 403         TCPDEBUG2(PRU_LISTEN);
 404         INP_WUNLOCK(inp);
 405         INP_INFO_WUNLOCK(&V_tcbinfo);
 406         return (error);
 407 }
 408 #endif /* INET6 */
 409
 410 /*
 411  * Initiate connection to peer.
 412  * Create a template for use in transmissions on this connection.
 413  * Enter SYN_SENT state, and mark socket as connecting.
 414  * Start keep-alive timer, and seed output sequence space.
 415  * Send initial segment on connection.
 416  */
 417 static int
 418 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 419 {
 420         int error = 0;
 421         struct inpcb *inp;
 422         struct tcpcb *tp = NULL;
 423         struct sockaddr_in *sinp;
 424
 425         sinp = (struct sockaddr_in *)nam;
 426         if (nam->sa_len != sizeof (*sinp))
 427                 return (EINVAL);
 428         /*
 429          * Must disallow TCP ``connections'' to multicast addresses.
 430          */
 431         if (sinp->sin_family == AF_INET
 432             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 433                 return (EAFNOSUPPORT);
 434         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 435                 return (error);
 436
 437         TCPDEBUG0;
 438         INP_INFO_WLOCK(&V_tcbinfo);
 439         inp = sotoinpcb(so);
 440         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 441         INP_WLOCK(inp);
 442         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 443                 error = EINVAL;
 444                 goto out;
 445         }
 446         tp = intotcpcb(inp);
 447         TCPDEBUG1();
 448         if ((error = tcp_connect(tp, nam, td)) != 0)
 449                 goto out;
 450         error = tcp_output_connect(so, nam);
 451 out:
 452         TCPDEBUG2(PRU_CONNECT);
 453         INP_WUNLOCK(inp);
 454         INP_INFO_WUNLOCK(&V_tcbinfo);
 455         return (error);
 456 }
 457
 458 #ifdef INET6
 459 static int
 460 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 461 {
 462         int error = 0;
 463         struct inpcb *inp;
 464         struct tcpcb *tp = NULL;
 465         struct sockaddr_in6 *sin6p;
 466
 467         TCPDEBUG0;
 468
 469         sin6p = (struct sockaddr_in6 *)nam;
 470         if (nam->sa_len != sizeof (*sin6p))
 471                 return (EINVAL);
 472         /*
 473          * Must disallow TCP ``connections'' to multicast addresses.
 474          */
 475         if (sin6p->sin6_family == AF_INET6
 476             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 477                 return (EAFNOSUPPORT);
 478
 479         INP_INFO_WLOCK(&V_tcbinfo);
 480         inp = sotoinpcb(so);
 481         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 482         INP_WLOCK(inp);
 483         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 484                 error = EINVAL;
 485                 goto out;
 486         }
 487         tp = intotcpcb(inp);
 488         TCPDEBUG1();
 489         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 490                 struct sockaddr_in sin;
 491
 492                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 493                         error = EINVAL;
 494                         goto out;
 495                 }
 496
 497                 in6_sin6_2_sin(&sin, sin6p);
 498                 inp->inp_vflag |= INP_IPV4;
 499                 inp->inp_vflag &= ~INP_IPV6;
 500                 if ((error = prison_remote_ip4(td->td_ucred,
 501                     &sin.sin_addr)) != 0)
 502                         goto out;
 503                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 504                         goto out;
 505                 error = tcp_output_connect(so, nam);
 506                 goto out;
 507         }
 508         inp->inp_vflag &= ~INP_IPV4;
 509         inp->inp_vflag |= INP_IPV6;
 510         inp->inp_inc.inc_flags |= INC_ISIPV6;
 511         if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
 512                 goto out;
 513         if ((error = tcp6_connect(tp, nam, td)) != 0)
 514                 goto out;
 515         error = tcp_output_connect(so, nam);
 516
 517 out:
 518         TCPDEBUG2(PRU_CONNECT);
 519         INP_WUNLOCK(inp);
 520         INP_INFO_WUNLOCK(&V_tcbinfo);
 521         return (error);
 522 }
 523 #endif /* INET6 */
 524
 525 /*
 526  * Initiate disconnect from peer.
 527  * If connection never passed embryonic stage, just drop;
 528  * else if don't need to let data drain, then can just drop anyways,
 529  * else have to begin TCP shutdown process: mark socket disconnecting,
 530  * drain unread data, state switch to reflect user close, and
 531  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 532  * when peer sends FIN and acks ours.
 533  *
 534  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 535  */
 536 static int
 537 tcp_usr_disconnect(struct socket *so)
 538 {
 539         struct inpcb *inp;
 540         struct tcpcb *tp = NULL;
 541         int error = 0;
 542
 543         TCPDEBUG0;
 544         INP_INFO_WLOCK(&V_tcbinfo);
 545         inp = sotoinpcb(so);
 546         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 547         INP_WLOCK(inp);
 548         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 549                 error = ECONNRESET;
 550                 goto out;
 551         }
 552         tp = intotcpcb(inp);
 553         TCPDEBUG1();
 554         tcp_disconnect(tp);
 555 out:
 556         TCPDEBUG2(PRU_DISCONNECT);
 557         INP_WUNLOCK(inp);
 558         INP_INFO_WUNLOCK(&V_tcbinfo);
 559         return (error);
 560 }
 561
 562 /*
 563  * Accept a connection.  Essentially all the work is done at higher levels;
 564  * just return the address of the peer, storing through addr.
 565  *
 566  * The rationale for acquiring the tcbinfo lock here is somewhat complicated,
 567  * and is described in detail in the commit log entry for r175612.  Acquiring
 568  * it delays an accept(2) racing with sonewconn(), which inserts the socket
 569  * before the inpcb address/port fields are initialized.  A better fix would
 570  * prevent the socket from being placed in the listen queue until all fields
 571  * are fully initialized.
 572  */
 573 static int
 574 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 575 {
 576         int error = 0;
 577         struct inpcb *inp = NULL;
 578         struct tcpcb *tp = NULL;
 579         struct in_addr addr;
 580         in_port_t port = 0;
 581         TCPDEBUG0;
 582
 583         if (so->so_state & SS_ISDISCONNECTED)
 584                 return (ECONNABORTED);
 585
 586         inp = sotoinpcb(so);
 587         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 588         INP_INFO_RLOCK(&V_tcbinfo);
 589         INP_WLOCK(inp);
 590         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 591                 error = ECONNABORTED;
 592                 goto out;
 593         }
 594         tp = intotcpcb(inp);
 595         TCPDEBUG1();
 596
 597         /*
 598          * We inline in_getpeeraddr and COMMON_END here, so that we can
 599          * copy the data of interest and defer the malloc until after we
 600          * release the lock.
 601          */
 602         port = inp->inp_fport;
 603         addr = inp->inp_faddr;
 604
 605 out:
 606         TCPDEBUG2(PRU_ACCEPT);
 607         INP_WUNLOCK(inp);
 608         INP_INFO_RUNLOCK(&V_tcbinfo);
 609         if (error == 0)
 610                 *nam = in_sockaddr(port, &addr);
 611         return error;
 612 }
 613
 614 #ifdef INET6
 615 static int
 616 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 617 {
 618         struct inpcb *inp = NULL;
 619         int error = 0;
 620         struct tcpcb *tp = NULL;
 621         struct in_addr addr;
 622         struct in6_addr addr6;
 623         in_port_t port = 0;
 624         int v4 = 0;
 625         TCPDEBUG0;
 626
 627         if (so->so_state & SS_ISDISCONNECTED)
 628                 return (ECONNABORTED);
 629
 630         inp = sotoinpcb(so);
 631         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 632         INP_WLOCK(inp);
 633         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 634                 error = ECONNABORTED;
 635                 goto out;
 636         }
 637         tp = intotcpcb(inp);
 638         TCPDEBUG1();
 639
 640         /*
 641          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 642          * copy the data of interest and defer the malloc until after we
 643          * release the lock.
 644          */
 645         if (inp->inp_vflag & INP_IPV4) {
 646                 v4 = 1;
 647                 port = inp->inp_fport;
 648                 addr = inp->inp_faddr;
 649         } else {
 650                 port = inp->inp_fport;
 651                 addr6 = inp->in6p_faddr;
 652         }
 653
 654 out:
 655         TCPDEBUG2(PRU_ACCEPT);
 656         INP_WUNLOCK(inp);
 657         if (error == 0) {
 658                 if (v4)
 659                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 660                 else
 661                         *nam = in6_sockaddr(port, &addr6);
 662         }
 663         return error;
 664 }
 665 #endif /* INET6 */
 666
 667 /*
 668  * Mark the connection as being incapable of further output.
 669  */
 670 static int
 671 tcp_usr_shutdown(struct socket *so)
 672 {
 673         int error = 0;
 674         struct inpcb *inp;
 675         struct tcpcb *tp = NULL;
 676
 677         TCPDEBUG0;
 678         INP_INFO_WLOCK(&V_tcbinfo);
 679         inp = sotoinpcb(so);
 680         KASSERT(inp != NULL, ("inp == NULL"));
 681         INP_WLOCK(inp);
 682         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 683                 error = ECONNRESET;
 684                 goto out;
 685         }
 686         tp = intotcpcb(inp);
 687         TCPDEBUG1();
 688         socantsendmore(so);
 689         tcp_usrclosed(tp);
 690         if (!(inp->inp_flags & INP_DROPPED))
 691                 error = tcp_output_disconnect(tp);
 692
 693 out:
 694         TCPDEBUG2(PRU_SHUTDOWN);
 695         INP_WUNLOCK(inp);
 696         INP_INFO_WUNLOCK(&V_tcbinfo);
 697
 698         return (error);
 699 }
 700
 701 /*
 702  * After a receive, possibly send window update to peer.
 703  */
 704 static int
 705 tcp_usr_rcvd(struct socket *so, int flags)
 706 {
 707         struct inpcb *inp;
 708         struct tcpcb *tp = NULL;
 709         int error = 0;
 710
 711         TCPDEBUG0;
 712         inp = sotoinpcb(so);
 713         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 714         INP_WLOCK(inp);
 715         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 716                 error = ECONNRESET;
 717                 goto out;
 718         }
 719         tp = intotcpcb(inp);
 720         TCPDEBUG1();
 721         tcp_output_rcvd(tp);
 722
 723 out:
 724         TCPDEBUG2(PRU_RCVD);
 725         INP_WUNLOCK(inp);
 726         return (error);
 727 }
 728
 729 /*
 730  * Do a send by putting data in output queue and updating urgent
 731  * marker if URG set.  Possibly send more data.  Unlike the other
 732  * pru_*() routines, the mbuf chains are our responsibility.  We
 733  * must either enqueue them or free them.  The other pru_* routines
 734  * generally are caller-frees.
 735  */
 736 static int
 737 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 738     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 739 {
 740         int error = 0;
 741         struct inpcb *inp;
 742         struct tcpcb *tp = NULL;
 743         int headlocked = 0;
 744 #ifdef INET6
 745         int isipv6;
 746 #endif
 747         TCPDEBUG0;
 748
 749         /*
 750          * We require the pcbinfo lock in two cases:
 751          *
 752          * (1) An implied connect is taking place, which can result in
 753          *     binding IPs and ports and hence modification of the pcb hash
 754          *     chains.
 755          *
 756          * (2) PRUS_EOF is set, resulting in explicit close on the send.
 757          */
 758         if ((nam != NULL) || (flags & PRUS_EOF)) {
 759                 INP_INFO_WLOCK(&V_tcbinfo);
 760                 headlocked = 1;
 761         }
 762         inp = sotoinpcb(so);
 763         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 764         INP_WLOCK(inp);
 765         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 766                 if (control)
 767                         m_freem(control);
 768                 if (m)
 769                         m_freem(m);
 770                 error = ECONNRESET;
 771                 goto out;
 772         }
 773 #ifdef INET6
 774         isipv6 = nam && nam->sa_family == AF_INET6;
 775 #endif /* INET6 */
 776         tp = intotcpcb(inp);
 777         TCPDEBUG1();
 778         if (control) {
 779                 /* TCP doesn't do control messages (rights, creds, etc) */
 780                 if (control->m_len) {
 781                         m_freem(control);
 782                         if (m)
 783                                 m_freem(m);
 784                         error = EINVAL;
 785                         goto out;
 786                 }
 787                 m_freem(control);       /* empty control, just free it */
 788         }
 789         if (!(flags & PRUS_OOB)) {
 790                 sbappendstream(&so->so_snd, m);
 791                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 792                         /*
 793                          * Do implied connect if not yet connected,
 794                          * initialize window to default value, and
 795                          * initialize maxseg/maxopd using peer's cached
 796                          * MSS.
 797                          */
 798                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 799 #ifdef INET6
 800                         if (isipv6)
 801                                 error = tcp6_connect(tp, nam, td);
 802                         else
 803 #endif /* INET6 */
 804                         error = tcp_connect(tp, nam, td);
 805                         if (error)
 806                                 goto out;
 807                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 808                         tcp_mss(tp, -1);
 809                 }
 810                 if (flags & PRUS_EOF) {
 811                         /*
 812                          * Close the send side of the connection after
 813                          * the data is sent.
 814                          */
 815                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 816                         socantsendmore(so);
 817                         tcp_usrclosed(tp);
 818                 }
 819                 if (headlocked) {
 820                         INP_INFO_WUNLOCK(&V_tcbinfo);
 821                         headlocked = 0;
 822                 }
 823                 if (!(inp->inp_flags & INP_DROPPED)) {
 824                         if (flags & PRUS_MORETOCOME)
 825                                 tp->t_flags |= TF_MORETOCOME;
 826                         error = tcp_output_send(tp);
 827                         if (flags & PRUS_MORETOCOME)
 828                                 tp->t_flags &= ~TF_MORETOCOME;
 829                 }
 830         } else {
 831                 /*
 832                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 833                  */
 834                 SOCKBUF_LOCK(&so->so_snd);
 835                 if (sbspace(&so->so_snd) < -512) {
 836                         SOCKBUF_UNLOCK(&so->so_snd);
 837                         m_freem(m);
 838                         error = ENOBUFS;
 839                         goto out;
 840                 }
 841                 /*
 842                  * According to RFC961 (Assigned Protocols),
 843                  * the urgent pointer points to the last octet
 844                  * of urgent data.  We continue, however,
 845                  * to consider it to indicate the first octet
 846                  * of data past the urgent section.
 847                  * Otherwise, snd_up should be one lower.
 848                  */
 849                 sbappendstream_locked(&so->so_snd, m);
 850                 SOCKBUF_UNLOCK(&so->so_snd);
 851                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 852                         /*
 853                          * Do implied connect if not yet connected,
 854                          * initialize window to default value, and
 855                          * initialize maxseg/maxopd using peer's cached
 856                          * MSS.
 857                          */
 858                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 859 #ifdef INET6
 860                         if (isipv6)
 861                                 error = tcp6_connect(tp, nam, td);
 862                         else
 863 #endif /* INET6 */
 864                         error = tcp_connect(tp, nam, td);
 865                         if (error)
 866                                 goto out;
 867                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 868                         tcp_mss(tp, -1);
 869                         INP_INFO_WUNLOCK(&V_tcbinfo);
 870                         headlocked = 0;
 871                 } else if (nam) {
 872                         INP_INFO_WUNLOCK(&V_tcbinfo);
 873                         headlocked = 0;
 874                 }
 875                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 876                 tp->t_flags |= TF_FORCEDATA;
 877                 error = tcp_output_send(tp);
 878                 tp->t_flags &= ~TF_FORCEDATA;
 879         }
 880 out:
 881         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
 882                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 883         INP_WUNLOCK(inp);
 884         if (headlocked)
 885                 INP_INFO_WUNLOCK(&V_tcbinfo);
 886         return (error);
 887 }
 888
 889 /*
 890  * Abort the TCP.  Drop the connection abruptly.
 891  */
 892 static void
 893 tcp_usr_abort(struct socket *so)
 894 {
 895         struct inpcb *inp;
 896         struct tcpcb *tp = NULL;
 897         TCPDEBUG0;
 898
 899         inp = sotoinpcb(so);
 900         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
 901
 902         INP_INFO_WLOCK(&V_tcbinfo);
 903         INP_WLOCK(inp);
 904         KASSERT(inp->inp_socket != NULL,
 905             ("tcp_usr_abort: inp_socket == NULL"));
 906
 907         /*
 908          * If we still have full TCP state, and we're not dropped, drop.
 909          */
 910         if (!(inp->inp_flags & INP_TIMEWAIT) &&
 911             !(inp->inp_flags & INP_DROPPED)) {
 912                 tp = intotcpcb(inp);
 913                 TCPDEBUG1();
 914                 tcp_drop(tp, ECONNABORTED);
 915                 TCPDEBUG2(PRU_ABORT);
 916         }
 917         if (!(inp->inp_flags & INP_DROPPED)) {
 918                 SOCK_LOCK(so);
 919                 so->so_state |= SS_PROTOREF;
 920                 SOCK_UNLOCK(so);
 921                 inp->inp_flags |= INP_SOCKREF;
 922         }
 923         INP_WUNLOCK(inp);
 924         INP_INFO_WUNLOCK(&V_tcbinfo);
 925 }
 926
 927 /*
 928  * TCP socket is closed.  Start friendly disconnect.
 929  */
 930 static void
 931 tcp_usr_close(struct socket *so)
 932 {
 933         struct inpcb *inp;
 934         struct tcpcb *tp = NULL;
 935         TCPDEBUG0;
 936
 937         inp = sotoinpcb(so);
 938         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
 939
 940         INP_INFO_WLOCK(&V_tcbinfo);
 941         INP_WLOCK(inp);
 942         KASSERT(inp->inp_socket != NULL,
 943             ("tcp_usr_close: inp_socket == NULL"));
 944
 945         /*
 946          * If we still have full TCP state, and we're not dropped, initiate
 947          * a disconnect.
 948          */
 949         if (!(inp->inp_flags & INP_TIMEWAIT) &&
 950             !(inp->inp_flags & INP_DROPPED)) {
 951                 tp = intotcpcb(inp);
 952                 TCPDEBUG1();
 953                 tcp_disconnect(tp);
 954                 TCPDEBUG2(PRU_CLOSE);
 955         }
 956         if (!(inp->inp_flags & INP_DROPPED)) {
 957                 SOCK_LOCK(so);
 958                 so->so_state |= SS_PROTOREF;
 959                 SOCK_UNLOCK(so);
 960                 inp->inp_flags |= INP_SOCKREF;
 961         }
 962         INP_WUNLOCK(inp);
 963         INP_INFO_WUNLOCK(&V_tcbinfo);
 964 }
 965
 966 /*
 967  * Receive out-of-band data.
 968  */
 969 static int
 970 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
 971 {
 972         int error = 0;
 973         struct inpcb *inp;
 974         struct tcpcb *tp = NULL;
 975
 976         TCPDEBUG0;
 977         inp = sotoinpcb(so);
 978         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
 979         INP_WLOCK(inp);
 980         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 981                 error = ECONNRESET;
 982                 goto out;
 983         }
 984         tp = intotcpcb(inp);
 985         TCPDEBUG1();
 986         if ((so->so_oobmark == 0 &&
 987              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
 988             so->so_options & SO_OOBINLINE ||
 989             tp->t_oobflags & TCPOOB_HADDATA) {
 990                 error = EINVAL;
 991                 goto out;
 992         }
 993         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
 994                 error = EWOULDBLOCK;
 995                 goto out;
 996         }
 997         m->m_len = 1;
 998         *mtod(m, caddr_t) = tp->t_iobc;
 999         if ((flags & MSG_PEEK) == 0)
1000                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1001
1002 out:
1003         TCPDEBUG2(PRU_RCVOOB);
1004         INP_WUNLOCK(inp);
1005         return (error);
1006 }
1007
1008 struct pr_usrreqs tcp_usrreqs = {
1009         .pru_abort =            tcp_usr_abort,
1010         .pru_accept =           tcp_usr_accept,
1011         .pru_attach =           tcp_usr_attach,
1012         .pru_bind =             tcp_usr_bind,
1013         .pru_connect =          tcp_usr_connect,
1014         .pru_control =          in_control,
1015         .pru_detach =           tcp_usr_detach,
1016         .pru_disconnect =       tcp_usr_disconnect,
1017         .pru_listen =           tcp_usr_listen,
1018         .pru_peeraddr =         in_getpeeraddr,
1019         .pru_rcvd =             tcp_usr_rcvd,
1020         .pru_rcvoob =           tcp_usr_rcvoob,
1021         .pru_send =             tcp_usr_send,
1022         .pru_shutdown =         tcp_usr_shutdown,
1023         .pru_sockaddr =         in_getsockaddr,
1024 #if 0
1025         .pru_soreceive =        soreceive_stream,
1026 #endif
1027         .pru_sosetlabel =       in_pcbsosetlabel,
1028         .pru_close =            tcp_usr_close,
1029 };
1030
1031 #ifdef INET6
1032 struct pr_usrreqs tcp6_usrreqs = {
1033         .pru_abort =            tcp_usr_abort,
1034         .pru_accept =           tcp6_usr_accept,
1035         .pru_attach =           tcp_usr_attach,
1036         .pru_bind =             tcp6_usr_bind,
1037         .pru_connect =          tcp6_usr_connect,
1038         .pru_control =          in6_control,
1039         .pru_detach =           tcp_usr_detach,
1040         .pru_disconnect =       tcp_usr_disconnect,
1041         .pru_listen =           tcp6_usr_listen,
1042         .pru_peeraddr =         in6_mapped_peeraddr,
1043         .pru_rcvd =             tcp_usr_rcvd,
1044         .pru_rcvoob =           tcp_usr_rcvoob,
1045         .pru_send =             tcp_usr_send,
1046         .pru_shutdown =         tcp_usr_shutdown,
1047         .pru_sockaddr =         in6_mapped_sockaddr,
1048 #if 0
1049         .pru_soreceive =        soreceive_stream,
1050 #endif
1051         .pru_sosetlabel =       in_pcbsosetlabel,
1052         .pru_close =            tcp_usr_close,
1053 };
1054 #endif /* INET6 */
1055
1056 /*
1057  * Common subroutine to open a TCP connection to remote host specified
1058  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1059  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1060  * to choose a local host address (interface).  If there is an existing
1061  * incarnation of the same connection in TIME-WAIT state and if the remote
1062  * host was sending CC options and if the connection duration was < MSL, then
1063  * truncate the previous TIME-WAIT state and proceed.
1064  * Initialize connection parameters and enter SYN-SENT state.
1065  */
1066 static int
1067 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1068 {
1069         struct inpcb *inp = tp->t_inpcb, *oinp;
1070         struct socket *so = inp->inp_socket;
1071         struct in_addr laddr;
1072         u_short lport;
1073         int error;
1074
1075         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1076         INP_WLOCK_ASSERT(inp);
1077
1078         if (inp->inp_lport == 0) {
1079                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1080                 if (error)
1081                         return error;
1082         }
1083
1084         /*
1085          * Cannot simply call in_pcbconnect, because there might be an
1086          * earlier incarnation of this same connection still in
1087          * TIME_WAIT state, creating an ADDRINUSE error.
1088          */
1089         laddr = inp->inp_laddr;
1090         lport = inp->inp_lport;
1091         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1092             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1093         if (error && oinp == NULL)
1094                 return error;
1095         if (oinp)
1096                 return EADDRINUSE;
1097         inp->inp_laddr = laddr;
1098         in_pcbrehash(inp);
1099
1100         /*
1101          * Compute window scaling to request:
1102          * Scale to fit into sweet spot.  See tcp_syncache.c.
1103          * XXX: This should move to tcp_output().
1104          */
1105         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1106             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1107                 tp->request_r_scale++;
1108
1109         soisconnecting(so);
1110         TCPSTAT_INC(tcps_connattempt);
1111         tp->t_state = TCPS_SYN_SENT;
1112         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1113         tp->iss = tcp_new_isn(tp);
1114         tp->t_bw_rtseq = tp->iss;
1115         tcp_sendseqinit(tp);
1116
1117         return 0;
1118 }
1119
1120 #ifdef INET6
1121 static int
1122 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1123 {
1124         struct inpcb *inp = tp->t_inpcb, *oinp;
1125         struct socket *so = inp->inp_socket;
1126         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1127         struct in6_addr addr6;
1128         int error;
1129
1130         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1131         INP_WLOCK_ASSERT(inp);
1132
1133         if (inp->inp_lport == 0) {
1134                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1135                 if (error)
1136                         return error;
1137         }
1138
1139         /*
1140          * Cannot simply call in_pcbconnect, because there might be an
1141          * earlier incarnation of this same connection still in
1142          * TIME_WAIT state, creating an ADDRINUSE error.
1143          * in6_pcbladdr() also handles scope zone IDs.
1144          */
1145         error = in6_pcbladdr(inp, nam, &addr6);
1146         if (error)
1147                 return error;
1148         oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1149                                   &sin6->sin6_addr, sin6->sin6_port,
1150                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1151                                   ? &addr6
1152                                   : &inp->in6p_laddr,
1153                                   inp->inp_lport,  0, NULL);
1154         if (oinp)
1155                 return EADDRINUSE;
1156         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1157                 inp->in6p_laddr = addr6;
1158         inp->in6p_faddr = sin6->sin6_addr;
1159         inp->inp_fport = sin6->sin6_port;
1160         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1161         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1162         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
1163                 inp->inp_flow |=
1164                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1165         in_pcbrehash(inp);
1166
1167         /* Compute window scaling to request.  */
1168         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1169             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1170                 tp->request_r_scale++;
1171
1172         soisconnecting(so);
1173         TCPSTAT_INC(tcps_connattempt);
1174         tp->t_state = TCPS_SYN_SENT;
1175         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1176         tp->iss = tcp_new_isn(tp);
1177         tp->t_bw_rtseq = tp->iss;
1178         tcp_sendseqinit(tp);
1179
1180         return 0;
1181 }
1182 #endif /* INET6 */
1183
1184 /*
1185  * Export TCP internal state information via a struct tcp_info, based on the
1186  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1187  * (TCP state machine, etc).  We export all information using FreeBSD-native
1188  * constants -- for example, the numeric values for tcpi_state will differ
1189  * from Linux.
1190  */
1191 static void
1192 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1193 {
1194
1195         INP_WLOCK_ASSERT(tp->t_inpcb);
1196         bzero(ti, sizeof(*ti));
1197
1198         ti->tcpi_state = tp->t_state;
1199         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1200                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1201         if (tp->t_flags & TF_SACK_PERMIT)
1202                 ti->tcpi_options |= TCPI_OPT_SACK;
1203         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1204                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1205                 ti->tcpi_snd_wscale = tp->snd_scale;
1206                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1207         }
1208
1209         ti->tcpi_rto = tp->t_rxtcur * tick;
1210         ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
1211         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1212         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1213
1214         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1215         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1216
1217         /*
1218          * FreeBSD-specific extension fields for tcp_info.
1219          */
1220         ti->tcpi_rcv_space = tp->rcv_wnd;
1221         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1222         ti->tcpi_snd_wnd = tp->snd_wnd;
1223         ti->tcpi_snd_bwnd = tp->snd_bwnd;
1224         ti->tcpi_snd_nxt = tp->snd_nxt;
1225         ti->tcpi_snd_mss = tp->t_maxseg;
1226         ti->tcpi_rcv_mss = tp->t_maxseg;
1227         if (tp->t_flags & TF_TOE)
1228                 ti->tcpi_options |= TCPI_OPT_TOE;
1229 }
1230
1231 /*
1232  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1233  * socket option arguments.  When it re-acquires the lock after the copy, it
1234  * has to revalidate that the connection is still valid for the socket
1235  * option.
1236  */
1237 #define INP_WLOCK_RECHECK(inp) do {                                     \
1238         INP_WLOCK(inp);                                                 \
1239         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1240                 INP_WUNLOCK(inp);                                       \
1241                 return (ECONNRESET);                                    \
1242         }                                                               \
1243         tp = intotcpcb(inp);                                            \
1244 } while(0)
1245
1246 int
1247 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1248 {
1249         int     error, opt, optval;
1250         struct  inpcb *inp;
1251         struct  tcpcb *tp;
1252         struct  tcp_info ti;
1253
1254         error = 0;
1255         inp = sotoinpcb(so);
1256         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1257         INP_WLOCK(inp);
1258         if (sopt->sopt_level != IPPROTO_TCP) {
1259 #ifdef INET6
1260                 if (inp->inp_vflag & INP_IPV6PROTO) {
1261                         INP_WUNLOCK(inp);
1262                         error = ip6_ctloutput(so, sopt);
1263                 } else {
1264 #endif /* INET6 */
1265                         INP_WUNLOCK(inp);
1266                         error = ip_ctloutput(so, sopt);
1267 #ifdef INET6
1268                 }
1269 #endif
1270                 return (error);
1271         }
1272         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1273                 INP_WUNLOCK(inp);
1274                 return (ECONNRESET);
1275         }
1276
1277         switch (sopt->sopt_dir) {
1278         case SOPT_SET:
1279                 switch (sopt->sopt_name) {
1280 #ifdef TCP_SIGNATURE
1281                 case TCP_MD5SIG:
1282                         INP_WUNLOCK(inp);
1283                         error = sooptcopyin(sopt, &optval, sizeof optval,
1284                             sizeof optval);
1285                         if (error)
1286                                 return (error);
1287
1288                         INP_WLOCK_RECHECK(inp);
1289                         if (optval > 0)
1290                                 tp->t_flags |= TF_SIGNATURE;
1291                         else
1292                                 tp->t_flags &= ~TF_SIGNATURE;
1293                         INP_WUNLOCK(inp);
1294                         break;
1295 #endif /* TCP_SIGNATURE */
1296                 case TCP_NODELAY:
1297                 case TCP_NOOPT:
1298                         INP_WUNLOCK(inp);
1299                         error = sooptcopyin(sopt, &optval, sizeof optval,
1300                             sizeof optval);
1301                         if (error)
1302                                 return (error);
1303
1304                         INP_WLOCK_RECHECK(inp);
1305                         switch (sopt->sopt_name) {
1306                         case TCP_NODELAY:
1307                                 opt = TF_NODELAY;
1308                                 break;
1309                         case TCP_NOOPT:
1310                                 opt = TF_NOOPT;
1311                                 break;
1312                         default:
1313                                 opt = 0; /* dead code to fool gcc */
1314                                 break;
1315                         }
1316
1317                         if (optval)
1318                                 tp->t_flags |= opt;
1319                         else
1320                                 tp->t_flags &= ~opt;
1321                         INP_WUNLOCK(inp);
1322                         break;
1323
1324                 case TCP_NOPUSH:
1325                         INP_WUNLOCK(inp);
1326                         error = sooptcopyin(sopt, &optval, sizeof optval,
1327                             sizeof optval);
1328                         if (error)
1329                                 return (error);
1330
1331                         INP_WLOCK_RECHECK(inp);
1332                         if (optval)
1333                                 tp->t_flags |= TF_NOPUSH;
1334                         else if (tp->t_flags & TF_NOPUSH) {
1335                                 tp->t_flags &= ~TF_NOPUSH;
1336                                 if (TCPS_HAVEESTABLISHED(tp->t_state))
1337                                         error = tcp_output(tp);
1338                         }
1339                         INP_WUNLOCK(inp);
1340                         break;
1341
1342                 case TCP_MAXSEG:
1343                         INP_WUNLOCK(inp);
1344                         error = sooptcopyin(sopt, &optval, sizeof optval,
1345                             sizeof optval);
1346                         if (error)
1347                                 return (error);
1348
1349                         INP_WLOCK_RECHECK(inp);
1350                         if (optval > 0 && optval <= tp->t_maxseg &&
1351                             optval + 40 >= V_tcp_minmss)
1352                                 tp->t_maxseg = optval;
1353                         else
1354                                 error = EINVAL;
1355                         INP_WUNLOCK(inp);
1356                         break;
1357
1358                 case TCP_INFO:
1359                         INP_WUNLOCK(inp);
1360                         error = EINVAL;
1361                         break;
1362
1363                 default:
1364                         INP_WUNLOCK(inp);
1365                         error = ENOPROTOOPT;
1366                         break;
1367                 }
1368                 break;
1369
1370         case SOPT_GET:
1371                 tp = intotcpcb(inp);
1372                 switch (sopt->sopt_name) {
1373 #ifdef TCP_SIGNATURE
1374                 case TCP_MD5SIG:
1375                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1376                         INP_WUNLOCK(inp);
1377                         error = sooptcopyout(sopt, &optval, sizeof optval);
1378                         break;
1379 #endif
1380
1381                 case TCP_NODELAY:
1382                         optval = tp->t_flags & TF_NODELAY;
1383                         INP_WUNLOCK(inp);
1384                         error = sooptcopyout(sopt, &optval, sizeof optval);
1385                         break;
1386                 case TCP_MAXSEG:
1387                         optval = tp->t_maxseg;
1388                         INP_WUNLOCK(inp);
1389                         error = sooptcopyout(sopt, &optval, sizeof optval);
1390                         break;
1391                 case TCP_NOOPT:
1392                         optval = tp->t_flags & TF_NOOPT;
1393                         INP_WUNLOCK(inp);
1394                         error = sooptcopyout(sopt, &optval, sizeof optval);
1395                         break;
1396                 case TCP_NOPUSH:
1397                         optval = tp->t_flags & TF_NOPUSH;
1398                         INP_WUNLOCK(inp);
1399                         error = sooptcopyout(sopt, &optval, sizeof optval);
1400                         break;
1401                 case TCP_INFO:
1402                         tcp_fill_info(tp, &ti);
1403                         INP_WUNLOCK(inp);
1404                         error = sooptcopyout(sopt, &ti, sizeof ti);
1405                         break;
1406                 default:
1407                         INP_WUNLOCK(inp);
1408                         error = ENOPROTOOPT;
1409                         break;
1410                 }
1411                 break;
1412         }
1413         return (error);
1414 }
1415 #undef INP_WLOCK_RECHECK
1416
1417 /*
1418  * tcp_sendspace and tcp_recvspace are the default send and receive window
1419  * sizes, respectively.  These are obsolescent (this information should
1420  * be set by the route).
1421  */
1422 u_long  tcp_sendspace = 1024*32;
1423 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1424     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1425 u_long  tcp_recvspace = 1024*64;
1426 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1427     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1428
1429 /*
1430  * Attach TCP protocol to socket, allocating
1431  * internet protocol control block, tcp control block,
1432  * bufer space, and entering LISTEN state if to accept connections.
1433  */
1434 static int
1435 tcp_attach(struct socket *so)
1436 {
1437         struct tcpcb *tp;
1438         struct inpcb *inp;
1439         int error;
1440
1441         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1442                 error = soreserve(so, tcp_sendspace, tcp_recvspace);
1443                 if (error)
1444                         return (error);
1445         }
1446         so->so_rcv.sb_flags |= SB_AUTOSIZE;
1447         so->so_snd.sb_flags |= SB_AUTOSIZE;
1448         INP_INFO_WLOCK(&V_tcbinfo);
1449         error = in_pcballoc(so, &V_tcbinfo);
1450         if (error) {
1451                 INP_INFO_WUNLOCK(&V_tcbinfo);
1452                 return (error);
1453         }
1454         inp = sotoinpcb(so);
1455 #ifdef INET6
1456         if (inp->inp_vflag & INP_IPV6PROTO) {
1457                 inp->inp_vflag |= INP_IPV6;
1458                 inp->in6p_hops = -1;    /* use kernel default */
1459         }
1460         else
1461 #endif
1462         inp->inp_vflag |= INP_IPV4;
1463         tp = tcp_newtcpcb(inp);
1464         if (tp == NULL) {
1465                 in_pcbdetach(inp);
1466                 in_pcbfree(inp);
1467                 INP_INFO_WUNLOCK(&V_tcbinfo);
1468                 return (ENOBUFS);
1469         }
1470         tp->t_state = TCPS_CLOSED;
1471         INP_WUNLOCK(inp);
1472         INP_INFO_WUNLOCK(&V_tcbinfo);
1473         return (0);
1474 }
1475
1476 /*
1477  * Initiate (or continue) disconnect.
1478  * If embryonic state, just send reset (once).
1479  * If in ``let data drain'' option and linger null, just drop.
1480  * Otherwise (hard), mark socket disconnecting and drop
1481  * current input data; switch states based on user close, and
1482  * send segment to peer (with FIN).
1483  */
1484 static void
1485 tcp_disconnect(struct tcpcb *tp)
1486 {
1487         struct inpcb *inp = tp->t_inpcb;
1488         struct socket *so = inp->inp_socket;
1489
1490         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1491         INP_WLOCK_ASSERT(inp);
1492
1493         /*
1494          * Neither tcp_close() nor tcp_drop() should return NULL, as the
1495          * socket is still open.
1496          */
1497         if (tp->t_state < TCPS_ESTABLISHED) {
1498                 tp = tcp_close(tp);
1499                 KASSERT(tp != NULL,
1500                     ("tcp_disconnect: tcp_close() returned NULL"));
1501         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1502                 tp = tcp_drop(tp, 0);
1503                 KASSERT(tp != NULL,
1504                     ("tcp_disconnect: tcp_drop() returned NULL"));
1505         } else {
1506                 soisdisconnecting(so);
1507                 sbflush(&so->so_rcv);
1508                 tcp_usrclosed(tp);
1509                 if (!(inp->inp_flags & INP_DROPPED))
1510                         tcp_output_disconnect(tp);
1511         }
1512 }
1513
1514 /*
1515  * User issued close, and wish to trail through shutdown states:
1516  * if never received SYN, just forget it.  If got a SYN from peer,
1517  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1518  * If already got a FIN from peer, then almost done; go to LAST_ACK
1519  * state.  In all other cases, have already sent FIN to peer (e.g.
1520  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1521  * for peer to send FIN or not respond to keep-alives, etc.
1522  * We can let the user exit from the close as soon as the FIN is acked.
1523  */
1524 static void
1525 tcp_usrclosed(struct tcpcb *tp)
1526 {
1527
1528         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1529         INP_WLOCK_ASSERT(tp->t_inpcb);
1530
1531         switch (tp->t_state) {
1532         case TCPS_LISTEN:
1533                 tcp_offload_listen_close(tp);
1534                 /* FALLTHROUGH */
1535         case TCPS_CLOSED:
1536                 tp->t_state = TCPS_CLOSED;
1537                 tp = tcp_close(tp);
1538                 /*
1539                  * tcp_close() should never return NULL here as the socket is
1540                  * still open.
1541                  */
1542                 KASSERT(tp != NULL,
1543                     ("tcp_usrclosed: tcp_close() returned NULL"));
1544                 break;
1545
1546         case TCPS_SYN_SENT:
1547         case TCPS_SYN_RECEIVED:
1548                 tp->t_flags |= TF_NEEDFIN;
1549                 break;
1550
1551         case TCPS_ESTABLISHED:
1552                 tp->t_state = TCPS_FIN_WAIT_1;
1553                 break;
1554
1555         case TCPS_CLOSE_WAIT:
1556                 tp->t_state = TCPS_LAST_ACK;
1557                 break;
1558         }
1559         if (tp->t_state >= TCPS_FIN_WAIT_2) {
1560                 soisdisconnected(tp->t_inpcb->inp_socket);
1561                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1562                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1563                         int timeout;
1564
1565                         timeout = (tcp_fast_finwait2_recycle) ?
1566                             tcp_finwait2_timeout : tcp_maxidle;
1567                         tcp_timer_activate(tp, TT_2MSL, timeout);
1568                 }
1569         }
1570 }
1571
1572 #ifdef DDB
1573 static void
1574 db_print_indent(int indent)
1575 {
1576         int i;
1577
1578         for (i = 0; i < indent; i++)
1579                 db_printf(" ");
1580 }
1581
1582 static void
1583 db_print_tstate(int t_state)
1584 {
1585
1586         switch (t_state) {
1587         case TCPS_CLOSED:
1588                 db_printf("TCPS_CLOSED");
1589                 return;
1590
1591         case TCPS_LISTEN:
1592                 db_printf("TCPS_LISTEN");
1593                 return;
1594
1595         case TCPS_SYN_SENT:
1596                 db_printf("TCPS_SYN_SENT");
1597                 return;
1598
1599         case TCPS_SYN_RECEIVED:
1600                 db_printf("TCPS_SYN_RECEIVED");
1601                 return;
1602
1603         case TCPS_ESTABLISHED:
1604                 db_printf("TCPS_ESTABLISHED");
1605                 return;
1606
1607         case TCPS_CLOSE_WAIT:
1608                 db_printf("TCPS_CLOSE_WAIT");
1609                 return;
1610
1611         case TCPS_FIN_WAIT_1:
1612                 db_printf("TCPS_FIN_WAIT_1");
1613                 return;
1614
1615         case TCPS_CLOSING:
1616                 db_printf("TCPS_CLOSING");
1617                 return;
1618
1619         case TCPS_LAST_ACK:
1620                 db_printf("TCPS_LAST_ACK");
1621                 return;
1622
1623         case TCPS_FIN_WAIT_2:
1624                 db_printf("TCPS_FIN_WAIT_2");
1625                 return;
1626
1627         case TCPS_TIME_WAIT:
1628                 db_printf("TCPS_TIME_WAIT");
1629                 return;
1630
1631         default:
1632                 db_printf("unknown");
1633                 return;
1634         }
1635 }
1636
1637 static void
1638 db_print_tflags(u_int t_flags)
1639 {
1640         int comma;
1641
1642         comma = 0;
1643         if (t_flags & TF_ACKNOW) {
1644                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1645                 comma = 1;
1646         }
1647         if (t_flags & TF_DELACK) {
1648                 db_printf("%sTF_DELACK", comma ? ", " : "");
1649                 comma = 1;
1650         }
1651         if (t_flags & TF_NODELAY) {
1652                 db_printf("%sTF_NODELAY", comma ? ", " : "");
1653                 comma = 1;
1654         }
1655         if (t_flags & TF_NOOPT) {
1656                 db_printf("%sTF_NOOPT", comma ? ", " : "");
1657                 comma = 1;
1658         }
1659         if (t_flags & TF_SENTFIN) {
1660                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1661                 comma = 1;
1662         }
1663         if (t_flags & TF_REQ_SCALE) {
1664                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1665                 comma = 1;
1666         }
1667         if (t_flags & TF_RCVD_SCALE) {
1668                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1669                 comma = 1;
1670         }
1671         if (t_flags & TF_REQ_TSTMP) {
1672                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1673                 comma = 1;
1674         }
1675         if (t_flags & TF_RCVD_TSTMP) {
1676                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1677                 comma = 1;
1678         }
1679         if (t_flags & TF_SACK_PERMIT) {
1680                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1681                 comma = 1;
1682         }
1683         if (t_flags & TF_NEEDSYN) {
1684                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1685                 comma = 1;
1686         }
1687         if (t_flags & TF_NEEDFIN) {
1688                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1689                 comma = 1;
1690         }
1691         if (t_flags & TF_NOPUSH) {
1692                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1693                 comma = 1;
1694         }
1695         if (t_flags & TF_NOPUSH) {
1696                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1697                 comma = 1;
1698         }
1699         if (t_flags & TF_MORETOCOME) {
1700                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1701                 comma = 1;
1702         }
1703         if (t_flags & TF_LQ_OVERFLOW) {
1704                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1705                 comma = 1;
1706         }
1707         if (t_flags & TF_LASTIDLE) {
1708                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1709                 comma = 1;
1710         }
1711         if (t_flags & TF_RXWIN0SENT) {
1712                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1713                 comma = 1;
1714         }
1715         if (t_flags & TF_FASTRECOVERY) {
1716                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1717                 comma = 1;
1718         }
1719         if (t_flags & TF_WASFRECOVERY) {
1720                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1721                 comma = 1;
1722         }
1723         if (t_flags & TF_SIGNATURE) {
1724                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1725                 comma = 1;
1726         }
1727         if (t_flags & TF_FORCEDATA) {
1728                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1729                 comma = 1;
1730         }
1731         if (t_flags & TF_TSO) {
1732                 db_printf("%sTF_TSO", comma ? ", " : "");
1733                 comma = 1;
1734         }
1735         if (t_flags & TF_ECN_PERMIT) {
1736                 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
1737                 comma = 1;
1738         }
1739 }
1740
1741 static void
1742 db_print_toobflags(char t_oobflags)
1743 {
1744         int comma;
1745
1746         comma = 0;
1747         if (t_oobflags & TCPOOB_HAVEDATA) {
1748                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1749                 comma = 1;
1750         }
1751         if (t_oobflags & TCPOOB_HADDATA) {
1752                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1753                 comma = 1;
1754         }
1755 }
1756
1757 static void
1758 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1759 {
1760
1761         db_print_indent(indent);
1762         db_printf("%s at %p\n", name, tp);
1763
1764         indent += 2;
1765
1766         db_print_indent(indent);
1767         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
1768            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1769
1770         db_print_indent(indent);
1771         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
1772             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1773
1774         db_print_indent(indent);
1775         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1776             &tp->t_timers->tt_delack, tp->t_inpcb);
1777
1778         db_print_indent(indent);
1779         db_printf("t_state: %d (", tp->t_state);
1780         db_print_tstate(tp->t_state);
1781         db_printf(")\n");
1782
1783         db_print_indent(indent);
1784         db_printf("t_flags: 0x%x (", tp->t_flags);
1785         db_print_tflags(tp->t_flags);
1786         db_printf(")\n");
1787
1788         db_print_indent(indent);
1789         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
1790             tp->snd_una, tp->snd_max, tp->snd_nxt);
1791
1792         db_print_indent(indent);
1793         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
1794            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1795
1796         db_print_indent(indent);
1797         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
1798             tp->iss, tp->irs, tp->rcv_nxt);
1799
1800         db_print_indent(indent);
1801         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
1802             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1803
1804         db_print_indent(indent);
1805         db_printf("snd_wnd: %lu   snd_cwnd: %lu   snd_bwnd: %lu\n",
1806            tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
1807
1808         db_print_indent(indent);
1809         db_printf("snd_ssthresh: %lu   snd_bandwidth: %lu   snd_recover: "
1810             "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
1811             tp->snd_recover);
1812
1813         db_print_indent(indent);
1814         db_printf("t_maxopd: %u   t_rcvtime: %u   t_startime: %u\n",
1815             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1816
1817         db_print_indent(indent);
1818         db_printf("t_rttime: %u   t_rtsq: 0x%08x   t_bw_rtttime: %u\n",
1819             tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
1820
1821         db_print_indent(indent);
1822         db_printf("t_bw_rtseq: 0x%08x   t_rxtcur: %d   t_maxseg: %u   "
1823             "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
1824             tp->t_srtt);
1825
1826         db_print_indent(indent);
1827         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
1828             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
1829             tp->t_rttbest);
1830
1831         db_print_indent(indent);
1832         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
1833             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
1834
1835         db_print_indent(indent);
1836         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
1837         db_print_toobflags(tp->t_oobflags);
1838         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
1839
1840         db_print_indent(indent);
1841         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
1842             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
1843
1844         db_print_indent(indent);
1845         db_printf("ts_recent: %u   ts_recent_age: %u\n",
1846             tp->ts_recent, tp->ts_recent_age);
1847
1848         db_print_indent(indent);
1849         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
1850             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
1851
1852         db_print_indent(indent);
1853         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
1854             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
1855             tp->snd_recover_prev, tp->t_badrxtwin);
1856
1857         db_print_indent(indent);
1858         db_printf("snd_numholes: %d  snd_holes first: %p\n",
1859             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
1860
1861         db_print_indent(indent);
1862         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
1863             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
1864
1865         /* Skip sackblks, sackhint. */
1866
1867         db_print_indent(indent);
1868         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
1869             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
1870 }
1871
1872 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
1873 {
1874         struct tcpcb *tp;
1875
1876         if (!have_addr) {
1877                 db_printf("usage: show tcpcb <addr>\n");
1878                 return;
1879         }
1880         tp = (struct tcpcb *)addr;
1881
1882         db_print_tcpcb(tp, "tcpcb", 0);
1883 }
1884 #endif