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
  64 #include <netinet/in.h>
  65 #include <netinet/in_systm.h>
  66 #ifdef INET6
  67 #include <netinet/ip6.h>
  68 #endif
  69 #include <netinet/in_pcb.h>
  70 #ifdef INET6
  71 #include <netinet6/in6_pcb.h>
  72 #endif
  73 #include <netinet/in_var.h>
  74 #include <netinet/ip_var.h>
  75 #ifdef INET6
  76 #include <netinet6/ip6_var.h>
  77 #include <netinet6/scope6_var.h>
  78 #endif
  79 #include <netinet/tcp.h>
  80 #include <netinet/tcp_fsm.h>
  81 #include <netinet/tcp_seq.h>
  82 #include <netinet/tcp_timer.h>
  83 #include <netinet/tcp_var.h>
  84 #include <netinet/tcpip.h>
  85 #ifdef TCPDEBUG
  86 #include <netinet/tcp_debug.h>
  87 #endif
  88 #include <netinet/tcp_offload.h>
  89
  90 /*
  91  * TCP protocol interface to socket abstraction.
  92  */
  93 static int      tcp_attach(struct socket *);
  94 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
  95                     struct thread *td);
  96 #ifdef INET6
  97 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
  98                     struct thread *td);
  99 #endif /* INET6 */
 100 static void     tcp_disconnect(struct tcpcb *);
 101 static void     tcp_usrclosed(struct tcpcb *);
 102 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 103
 104 #ifdef TCPDEBUG
 105 #define TCPDEBUG0       int ostate = 0
 106 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 107 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 108                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 109 #else
 110 #define TCPDEBUG0
 111 #define TCPDEBUG1()
 112 #define TCPDEBUG2(req)
 113 #endif
 114
 115 /*
 116  * TCP attaches to socket via pru_attach(), reserving space,
 117  * and an internet control block.
 118  */
 119 static int
 120 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 121 {
 122         struct inpcb *inp;
 123         struct tcpcb *tp = NULL;
 124         int error;
 125         TCPDEBUG0;
 126
 127         inp = sotoinpcb(so);
 128         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 129         TCPDEBUG1();
 130
 131         error = tcp_attach(so);
 132         if (error)
 133                 goto out;
 134
 135         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 136                 so->so_linger = TCP_LINGERTIME;
 137
 138         inp = sotoinpcb(so);
 139         tp = intotcpcb(inp);
 140 out:
 141         TCPDEBUG2(PRU_ATTACH);
 142         return error;
 143 }
 144
 145 /*
 146  * tcp_detach is called when the socket layer loses its final reference
 147  * to the socket, be it a file descriptor reference, a reference from TCP,
 148  * etc.  At this point, there is only one case in which we will keep around
 149  * inpcb state: time wait.
 150  *
 151  * This function can probably be re-absorbed back into tcp_usr_detach() now
 152  * that there is a single detach path.
 153  */
 154 static void
 155 tcp_detach(struct socket *so, struct inpcb *inp)
 156 {
 157         struct tcpcb *tp;
 158 #ifdef INET6
 159         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
 160 #endif
 161
 162         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 163         INP_LOCK_ASSERT(inp);
 164
 165         KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
 166         KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
 167
 168         tp = intotcpcb(inp);
 169
 170         if (inp->inp_vflag & INP_TIMEWAIT) {
 171                 /*
 172                  * There are two cases to handle: one in which the time wait
 173                  * state is being discarded (INP_DROPPED), and one in which
 174                  * this connection will remain in timewait.  In the former,
 175                  * it is time to discard all state (except tcptw, which has
 176                  * already been discarded by the timewait close code, which
 177                  * should be further up the call stack somewhere).  In the
 178                  * latter case, we detach from the socket, but leave the pcb
 179                  * present until timewait ends.
 180                  *
 181                  * XXXRW: Would it be cleaner to free the tcptw here?
 182                  */
 183                 if (inp->inp_vflag & INP_DROPPED) {
 184                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 185                             "INP_DROPPED && tp != NULL"));
 186 #ifdef INET6
 187                         if (isipv6) {
 188                                 in6_pcbdetach(inp);
 189                                 in6_pcbfree(inp);
 190                         } else {
 191 #endif
 192                                 in_pcbdetach(inp);
 193                                 in_pcbfree(inp);
 194 #ifdef INET6
 195                         }
 196 #endif
 197                 } else {
 198 #ifdef INET6
 199                         if (isipv6)
 200                                 in6_pcbdetach(inp);
 201                         else
 202 #endif
 203                                 in_pcbdetach(inp);
 204                         INP_UNLOCK(inp);
 205                 }
 206         } else {
 207                 /*
 208                  * If the connection is not in timewait, we consider two
 209                  * two conditions: one in which no further processing is
 210                  * necessary (dropped || embryonic), and one in which TCP is
 211                  * not yet done, but no longer requires the socket, so the
 212                  * pcb will persist for the time being.
 213                  *
 214                  * XXXRW: Does the second case still occur?
 215                  */
 216                 if (inp->inp_vflag & INP_DROPPED ||
 217                     tp->t_state < TCPS_SYN_SENT) {
 218                         tcp_discardcb(tp);
 219 #ifdef INET6
 220                         if (isipv6) {
 221                                 in6_pcbdetach(inp);
 222                                 in6_pcbfree(inp);
 223                         } else {
 224 #endif
 225                                 in_pcbdetach(inp);
 226                                 in_pcbfree(inp);
 227 #ifdef INET6
 228                         }
 229 #endif
 230                 } else {
 231 #ifdef INET6
 232                         if (isipv6)
 233                                 in6_pcbdetach(inp);
 234                         else
 235 #endif
 236                                 in_pcbdetach(inp);
 237                 }
 238         }
 239 }
 240
 241 /*
 242  * pru_detach() detaches the TCP protocol from the socket.
 243  * If the protocol state is non-embryonic, then can't
 244  * do this directly: have to initiate a pru_disconnect(),
 245  * which may finish later; embryonic TCB's can just
 246  * be discarded here.
 247  */
 248 static void
 249 tcp_usr_detach(struct socket *so)
 250 {
 251         struct inpcb *inp;
 252
 253         inp = sotoinpcb(so);
 254         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
 255         INP_INFO_WLOCK(&tcbinfo);
 256         INP_LOCK(inp);
 257         KASSERT(inp->inp_socket != NULL,
 258             ("tcp_usr_detach: inp_socket == NULL"));
 259         tcp_detach(so, inp);
 260         INP_INFO_WUNLOCK(&tcbinfo);
 261 }
 262
 263 /*
 264  * Give the socket an address.
 265  */
 266 static int
 267 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 268 {
 269         int error = 0;
 270         struct inpcb *inp;
 271         struct tcpcb *tp = NULL;
 272         struct sockaddr_in *sinp;
 273
 274         sinp = (struct sockaddr_in *)nam;
 275         if (nam->sa_len != sizeof (*sinp))
 276                 return (EINVAL);
 277         /*
 278          * Must check for multicast addresses and disallow binding
 279          * to them.
 280          */
 281         if (sinp->sin_family == AF_INET &&
 282             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 283                 return (EAFNOSUPPORT);
 284
 285         TCPDEBUG0;
 286         INP_INFO_WLOCK(&tcbinfo);
 287         inp = sotoinpcb(so);
 288         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 289         INP_LOCK(inp);
 290         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 291                 error = EINVAL;
 292                 goto out;
 293         }
 294         tp = intotcpcb(inp);
 295         TCPDEBUG1();
 296         error = in_pcbbind(inp, nam, td->td_ucred);
 297 out:
 298         TCPDEBUG2(PRU_BIND);
 299         INP_UNLOCK(inp);
 300         INP_INFO_WUNLOCK(&tcbinfo);
 301
 302         return (error);
 303 }
 304
 305 #ifdef INET6
 306 static int
 307 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 308 {
 309         int error = 0;
 310         struct inpcb *inp;
 311         struct tcpcb *tp = NULL;
 312         struct sockaddr_in6 *sin6p;
 313
 314         sin6p = (struct sockaddr_in6 *)nam;
 315         if (nam->sa_len != sizeof (*sin6p))
 316                 return (EINVAL);
 317         /*
 318          * Must check for multicast addresses and disallow binding
 319          * to them.
 320          */
 321         if (sin6p->sin6_family == AF_INET6 &&
 322             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 323                 return (EAFNOSUPPORT);
 324
 325         TCPDEBUG0;
 326         INP_INFO_WLOCK(&tcbinfo);
 327         inp = sotoinpcb(so);
 328         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 329         INP_LOCK(inp);
 330         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 331                 error = EINVAL;
 332                 goto out;
 333         }
 334         tp = intotcpcb(inp);
 335         TCPDEBUG1();
 336         inp->inp_vflag &= ~INP_IPV4;
 337         inp->inp_vflag |= INP_IPV6;
 338         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 339                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 340                         inp->inp_vflag |= INP_IPV4;
 341                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 342                         struct sockaddr_in sin;
 343
 344                         in6_sin6_2_sin(&sin, sin6p);
 345                         inp->inp_vflag |= INP_IPV4;
 346                         inp->inp_vflag &= ~INP_IPV6;
 347                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 348                             td->td_ucred);
 349                         goto out;
 350                 }
 351         }
 352         error = in6_pcbbind(inp, nam, td->td_ucred);
 353 out:
 354         TCPDEBUG2(PRU_BIND);
 355         INP_UNLOCK(inp);
 356         INP_INFO_WUNLOCK(&tcbinfo);
 357         return (error);
 358 }
 359 #endif /* INET6 */
 360
 361 /*
 362  * Prepare to accept connections.
 363  */
 364 static int
 365 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 366 {
 367         int error = 0;
 368         struct inpcb *inp;
 369         struct tcpcb *tp = NULL;
 370
 371         TCPDEBUG0;
 372         INP_INFO_WLOCK(&tcbinfo);
 373         inp = sotoinpcb(so);
 374         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 375         INP_LOCK(inp);
 376         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 377                 error = EINVAL;
 378                 goto out;
 379         }
 380         tp = intotcpcb(inp);
 381         TCPDEBUG1();
 382         SOCK_LOCK(so);
 383         error = solisten_proto_check(so);
 384         if (error == 0 && inp->inp_lport == 0)
 385                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 386         if (error == 0) {
 387                 tp->t_state = TCPS_LISTEN;
 388                 solisten_proto(so, backlog);
 389                 tcp_offload_listen_open(tp);
 390         }
 391         SOCK_UNLOCK(so);
 392
 393 out:
 394         TCPDEBUG2(PRU_LISTEN);
 395         INP_UNLOCK(inp);
 396         INP_INFO_WUNLOCK(&tcbinfo);
 397         return (error);
 398 }
 399
 400 #ifdef INET6
 401 static int
 402 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 403 {
 404         int error = 0;
 405         struct inpcb *inp;
 406         struct tcpcb *tp = NULL;
 407
 408         TCPDEBUG0;
 409         INP_INFO_WLOCK(&tcbinfo);
 410         inp = sotoinpcb(so);
 411         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 412         INP_LOCK(inp);
 413         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 414                 error = EINVAL;
 415                 goto out;
 416         }
 417         tp = intotcpcb(inp);
 418         TCPDEBUG1();
 419         SOCK_LOCK(so);
 420         error = solisten_proto_check(so);
 421         if (error == 0 && inp->inp_lport == 0) {
 422                 inp->inp_vflag &= ~INP_IPV4;
 423                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 424                         inp->inp_vflag |= INP_IPV4;
 425                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 426         }
 427         if (error == 0) {
 428                 tp->t_state = TCPS_LISTEN;
 429                 solisten_proto(so, backlog);
 430         }
 431         SOCK_UNLOCK(so);
 432
 433 out:
 434         TCPDEBUG2(PRU_LISTEN);
 435         INP_UNLOCK(inp);
 436         INP_INFO_WUNLOCK(&tcbinfo);
 437         return (error);
 438 }
 439 #endif /* INET6 */
 440
 441 /*
 442  * Initiate connection to peer.
 443  * Create a template for use in transmissions on this connection.
 444  * Enter SYN_SENT state, and mark socket as connecting.
 445  * Start keep-alive timer, and seed output sequence space.
 446  * Send initial segment on connection.
 447  */
 448 static int
 449 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 450 {
 451         int error = 0;
 452         struct inpcb *inp;
 453         struct tcpcb *tp = NULL;
 454         struct sockaddr_in *sinp;
 455
 456         sinp = (struct sockaddr_in *)nam;
 457         if (nam->sa_len != sizeof (*sinp))
 458                 return (EINVAL);
 459         /*
 460          * Must disallow TCP ``connections'' to multicast addresses.
 461          */
 462         if (sinp->sin_family == AF_INET
 463             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 464                 return (EAFNOSUPPORT);
 465         if (jailed(td->td_ucred))
 466                 prison_remote_ip(td->td_ucred, 0, &sinp->sin_addr.s_addr);
 467
 468         TCPDEBUG0;
 469         INP_INFO_WLOCK(&tcbinfo);
 470         inp = sotoinpcb(so);
 471         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 472         INP_LOCK(inp);
 473         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 474                 error = EINVAL;
 475                 goto out;
 476         }
 477         tp = intotcpcb(inp);
 478         TCPDEBUG1();
 479         if ((error = tcp_connect(tp, nam, td)) != 0)
 480                 goto out;
 481         error = tcp_output_connect(so, nam);
 482 out:
 483         TCPDEBUG2(PRU_CONNECT);
 484         INP_UNLOCK(inp);
 485         INP_INFO_WUNLOCK(&tcbinfo);
 486         return (error);
 487 }
 488
 489 #ifdef INET6
 490 static int
 491 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 492 {
 493         int error = 0;
 494         struct inpcb *inp;
 495         struct tcpcb *tp = NULL;
 496         struct sockaddr_in6 *sin6p;
 497
 498         TCPDEBUG0;
 499
 500         sin6p = (struct sockaddr_in6 *)nam;
 501         if (nam->sa_len != sizeof (*sin6p))
 502                 return (EINVAL);
 503         /*
 504          * Must disallow TCP ``connections'' to multicast addresses.
 505          */
 506         if (sin6p->sin6_family == AF_INET6
 507             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 508                 return (EAFNOSUPPORT);
 509
 510         INP_INFO_WLOCK(&tcbinfo);
 511         inp = sotoinpcb(so);
 512         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 513         INP_LOCK(inp);
 514         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 515                 error = EINVAL;
 516                 goto out;
 517         }
 518         tp = intotcpcb(inp);
 519         TCPDEBUG1();
 520         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 521                 struct sockaddr_in sin;
 522
 523                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 524                         error = EINVAL;
 525                         goto out;
 526                 }
 527
 528                 in6_sin6_2_sin(&sin, sin6p);
 529                 inp->inp_vflag |= INP_IPV4;
 530                 inp->inp_vflag &= ~INP_IPV6;
 531                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 532                         goto out;
 533                 error = tcp_output_connect(so, nam);
 534                 goto out;
 535         }
 536         inp->inp_vflag &= ~INP_IPV4;
 537         inp->inp_vflag |= INP_IPV6;
 538         inp->inp_inc.inc_isipv6 = 1;
 539         if ((error = tcp6_connect(tp, nam, td)) != 0)
 540                 goto out;
 541         error = tcp_output_connect(so, nam);
 542
 543 out:
 544         TCPDEBUG2(PRU_CONNECT);
 545         INP_UNLOCK(inp);
 546         INP_INFO_WUNLOCK(&tcbinfo);
 547         return (error);
 548 }
 549 #endif /* INET6 */
 550
 551 /*
 552  * Initiate disconnect from peer.
 553  * If connection never passed embryonic stage, just drop;
 554  * else if don't need to let data drain, then can just drop anyways,
 555  * else have to begin TCP shutdown process: mark socket disconnecting,
 556  * drain unread data, state switch to reflect user close, and
 557  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 558  * when peer sends FIN and acks ours.
 559  *
 560  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 561  */
 562 static int
 563 tcp_usr_disconnect(struct socket *so)
 564 {
 565         struct inpcb *inp;
 566         struct tcpcb *tp = NULL;
 567         int error = 0;
 568
 569         TCPDEBUG0;
 570         INP_INFO_WLOCK(&tcbinfo);
 571         inp = sotoinpcb(so);
 572         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 573         INP_LOCK(inp);
 574         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 575                 error = ECONNRESET;
 576                 goto out;
 577         }
 578         tp = intotcpcb(inp);
 579         TCPDEBUG1();
 580         tcp_disconnect(tp);
 581 out:
 582         TCPDEBUG2(PRU_DISCONNECT);
 583         INP_UNLOCK(inp);
 584         INP_INFO_WUNLOCK(&tcbinfo);
 585         return (error);
 586 }
 587
 588 /*
 589  * Accept a connection.  Essentially all the work is
 590  * done at higher levels; just return the address
 591  * of the peer, storing through addr.
 592  */
 593 static int
 594 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 595 {
 596         int error = 0;
 597         struct inpcb *inp = NULL;
 598         struct tcpcb *tp = NULL;
 599         struct in_addr addr;
 600         in_port_t port = 0;
 601         TCPDEBUG0;
 602
 603         if (so->so_state & SS_ISDISCONNECTED)
 604                 return (ECONNABORTED);
 605
 606         inp = sotoinpcb(so);
 607         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 608         INP_LOCK(inp);
 609         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 610                 error = ECONNABORTED;
 611                 goto out;
 612         }
 613         tp = intotcpcb(inp);
 614         TCPDEBUG1();
 615
 616         /*
 617          * We inline in_getpeeraddr and COMMON_END here, so that we can
 618          * copy the data of interest and defer the malloc until after we
 619          * release the lock.
 620          */
 621         port = inp->inp_fport;
 622         addr = inp->inp_faddr;
 623
 624 out:
 625         TCPDEBUG2(PRU_ACCEPT);
 626         INP_UNLOCK(inp);
 627         if (error == 0)
 628                 *nam = in_sockaddr(port, &addr);
 629         return error;
 630 }
 631
 632 #ifdef INET6
 633 static int
 634 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 635 {
 636         struct inpcb *inp = NULL;
 637         int error = 0;
 638         struct tcpcb *tp = NULL;
 639         struct in_addr addr;
 640         struct in6_addr addr6;
 641         in_port_t port = 0;
 642         int v4 = 0;
 643         TCPDEBUG0;
 644
 645         if (so->so_state & SS_ISDISCONNECTED)
 646                 return (ECONNABORTED);
 647
 648         inp = sotoinpcb(so);
 649         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 650         INP_LOCK(inp);
 651         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 652                 error = ECONNABORTED;
 653                 goto out;
 654         }
 655         tp = intotcpcb(inp);
 656         TCPDEBUG1();
 657
 658         /*
 659          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 660          * copy the data of interest and defer the malloc until after we
 661          * release the lock.
 662          */
 663         if (inp->inp_vflag & INP_IPV4) {
 664                 v4 = 1;
 665                 port = inp->inp_fport;
 666                 addr = inp->inp_faddr;
 667         } else {
 668                 port = inp->inp_fport;
 669                 addr6 = inp->in6p_faddr;
 670         }
 671
 672 out:
 673         TCPDEBUG2(PRU_ACCEPT);
 674         INP_UNLOCK(inp);
 675         if (error == 0) {
 676                 if (v4)
 677                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 678                 else
 679                         *nam = in6_sockaddr(port, &addr6);
 680         }
 681         return error;
 682 }
 683 #endif /* INET6 */
 684
 685 /*
 686  * Mark the connection as being incapable of further output.
 687  */
 688 static int
 689 tcp_usr_shutdown(struct socket *so)
 690 {
 691         int error = 0;
 692         struct inpcb *inp;
 693         struct tcpcb *tp = NULL;
 694
 695         TCPDEBUG0;
 696         INP_INFO_WLOCK(&tcbinfo);
 697         inp = sotoinpcb(so);
 698         KASSERT(inp != NULL, ("inp == NULL"));
 699         INP_LOCK(inp);
 700         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 701                 error = ECONNRESET;
 702                 goto out;
 703         }
 704         tp = intotcpcb(inp);
 705         TCPDEBUG1();
 706         socantsendmore(so);
 707         tcp_usrclosed(tp);
 708         error = tcp_output_disconnect(tp);
 709
 710 out:
 711         TCPDEBUG2(PRU_SHUTDOWN);
 712         INP_UNLOCK(inp);
 713         INP_INFO_WUNLOCK(&tcbinfo);
 714
 715         return (error);
 716 }
 717
 718 /*
 719  * After a receive, possibly send window update to peer.
 720  */
 721 static int
 722 tcp_usr_rcvd(struct socket *so, int flags)
 723 {
 724         struct inpcb *inp;
 725         struct tcpcb *tp = NULL;
 726         int error = 0;
 727
 728         TCPDEBUG0;
 729         inp = sotoinpcb(so);
 730         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 731         INP_LOCK(inp);
 732         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 733                 error = ECONNRESET;
 734                 goto out;
 735         }
 736         tp = intotcpcb(inp);
 737         TCPDEBUG1();
 738         tcp_output_rcvd(tp);
 739
 740 out:
 741         TCPDEBUG2(PRU_RCVD);
 742         INP_UNLOCK(inp);
 743         return (error);
 744 }
 745
 746 /*
 747  * Do a send by putting data in output queue and updating urgent
 748  * marker if URG set.  Possibly send more data.  Unlike the other
 749  * pru_*() routines, the mbuf chains are our responsibility.  We
 750  * must either enqueue them or free them.  The other pru_* routines
 751  * generally are caller-frees.
 752  */
 753 static int
 754 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 755     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 756 {
 757         int error = 0;
 758         struct inpcb *inp;
 759         struct tcpcb *tp = NULL;
 760         int headlocked = 0;
 761 #ifdef INET6
 762         int isipv6;
 763 #endif
 764         TCPDEBUG0;
 765
 766         /*
 767          * We require the pcbinfo lock in two cases:
 768          *
 769          * (1) An implied connect is taking place, which can result in
 770          *     binding IPs and ports and hence modification of the pcb hash
 771          *     chains.
 772          *
 773          * (2) PRUS_EOF is set, resulting in explicit close on the send.
 774          */
 775         if ((nam != NULL) || (flags & PRUS_EOF)) {
 776                 INP_INFO_WLOCK(&tcbinfo);
 777                 headlocked = 1;
 778         }
 779         inp = sotoinpcb(so);
 780         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 781         INP_LOCK(inp);
 782         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 783                 if (control)
 784                         m_freem(control);
 785                 if (m)
 786                         m_freem(m);
 787                 error = ECONNRESET;
 788                 goto out;
 789         }
 790 #ifdef INET6
 791         isipv6 = nam && nam->sa_family == AF_INET6;
 792 #endif /* INET6 */
 793         tp = intotcpcb(inp);
 794         TCPDEBUG1();
 795         if (control) {
 796                 /* TCP doesn't do control messages (rights, creds, etc) */
 797                 if (control->m_len) {
 798                         m_freem(control);
 799                         if (m)
 800                                 m_freem(m);
 801                         error = EINVAL;
 802                         goto out;
 803                 }
 804                 m_freem(control);       /* empty control, just free it */
 805         }
 806         if (!(flags & PRUS_OOB)) {
 807                 sbappendstream(&so->so_snd, m);
 808                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 809                         /*
 810                          * Do implied connect if not yet connected,
 811                          * initialize window to default value, and
 812                          * initialize maxseg/maxopd using peer's cached
 813                          * MSS.
 814                          */
 815                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 816 #ifdef INET6
 817                         if (isipv6)
 818                                 error = tcp6_connect(tp, nam, td);
 819                         else
 820 #endif /* INET6 */
 821                         error = tcp_connect(tp, nam, td);
 822                         if (error)
 823                                 goto out;
 824                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 825                         tcp_mss(tp, -1);
 826                 }
 827                 if (flags & PRUS_EOF) {
 828                         /*
 829                          * Close the send side of the connection after
 830                          * the data is sent.
 831                          */
 832                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 833                         socantsendmore(so);
 834                         tcp_usrclosed(tp);
 835                 }
 836                 if (headlocked) {
 837                         INP_INFO_WUNLOCK(&tcbinfo);
 838                         headlocked = 0;
 839                 }
 840                 if (tp != NULL) {
 841                         if (flags & PRUS_MORETOCOME)
 842                                 tp->t_flags |= TF_MORETOCOME;
 843                         error = tcp_output_send(tp);
 844                         if (flags & PRUS_MORETOCOME)
 845                                 tp->t_flags &= ~TF_MORETOCOME;
 846                 }
 847         } else {
 848                 /*
 849                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 850                  */
 851                 SOCKBUF_LOCK(&so->so_snd);
 852                 if (sbspace(&so->so_snd) < -512) {
 853                         SOCKBUF_UNLOCK(&so->so_snd);
 854                         m_freem(m);
 855                         error = ENOBUFS;
 856                         goto out;
 857                 }
 858                 /*
 859                  * According to RFC961 (Assigned Protocols),
 860                  * the urgent pointer points to the last octet
 861                  * of urgent data.  We continue, however,
 862                  * to consider it to indicate the first octet
 863                  * of data past the urgent section.
 864                  * Otherwise, snd_up should be one lower.
 865                  */
 866                 sbappendstream_locked(&so->so_snd, m);
 867                 SOCKBUF_UNLOCK(&so->so_snd);
 868                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 869                         /*
 870                          * Do implied connect if not yet connected,
 871                          * initialize window to default value, and
 872                          * initialize maxseg/maxopd using peer's cached
 873                          * MSS.
 874                          */
 875                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 876 #ifdef INET6
 877                         if (isipv6)
 878                                 error = tcp6_connect(tp, nam, td);
 879                         else
 880 #endif /* INET6 */
 881                         error = tcp_connect(tp, nam, td);
 882                         if (error)
 883                                 goto out;
 884                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 885                         tcp_mss(tp, -1);
 886                         INP_INFO_WUNLOCK(&tcbinfo);
 887                         headlocked = 0;
 888                 } else if (nam) {
 889                         INP_INFO_WUNLOCK(&tcbinfo);
 890                         headlocked = 0;
 891                 }
 892                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 893                 tp->t_flags |= TF_FORCEDATA;
 894                 error = tcp_output_send(tp);
 895                 tp->t_flags &= ~TF_FORCEDATA;
 896         }
 897 out:
 898         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
 899                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 900         INP_UNLOCK(inp);
 901         if (headlocked)
 902                 INP_INFO_WUNLOCK(&tcbinfo);
 903         return (error);
 904 }
 905
 906 /*
 907  * Abort the TCP.  Drop the connection abruptly.
 908  */
 909 static void
 910 tcp_usr_abort(struct socket *so)
 911 {
 912         struct inpcb *inp;
 913         struct tcpcb *tp = NULL;
 914         TCPDEBUG0;
 915
 916         inp = sotoinpcb(so);
 917         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
 918
 919         INP_INFO_WLOCK(&tcbinfo);
 920         INP_LOCK(inp);
 921         KASSERT(inp->inp_socket != NULL,
 922             ("tcp_usr_abort: inp_socket == NULL"));
 923
 924         /*
 925          * If we still have full TCP state, and we're not dropped, drop.
 926          */
 927         if (!(inp->inp_vflag & INP_TIMEWAIT) &&
 928             !(inp->inp_vflag & INP_DROPPED)) {
 929                 tp = intotcpcb(inp);
 930                 TCPDEBUG1();
 931                 tcp_drop(tp, ECONNABORTED);
 932                 TCPDEBUG2(PRU_ABORT);
 933         }
 934         if (!(inp->inp_vflag & INP_DROPPED)) {
 935                 SOCK_LOCK(so);
 936                 so->so_state |= SS_PROTOREF;
 937                 SOCK_UNLOCK(so);
 938                 inp->inp_vflag |= INP_SOCKREF;
 939         }
 940         INP_UNLOCK(inp);
 941         INP_INFO_WUNLOCK(&tcbinfo);
 942 }
 943
 944 /*
 945  * TCP socket is closed.  Start friendly disconnect.
 946  */
 947 static void
 948 tcp_usr_close(struct socket *so)
 949 {
 950         struct inpcb *inp;
 951         struct tcpcb *tp = NULL;
 952         TCPDEBUG0;
 953
 954         inp = sotoinpcb(so);
 955         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
 956
 957         INP_INFO_WLOCK(&tcbinfo);
 958         INP_LOCK(inp);
 959         KASSERT(inp->inp_socket != NULL,
 960             ("tcp_usr_close: inp_socket == NULL"));
 961
 962         /*
 963          * If we still have full TCP state, and we're not dropped, initiate
 964          * a disconnect.
 965          */
 966         if (!(inp->inp_vflag & INP_TIMEWAIT) &&
 967             !(inp->inp_vflag & INP_DROPPED)) {
 968                 tp = intotcpcb(inp);
 969                 TCPDEBUG1();
 970                 tcp_disconnect(tp);
 971                 TCPDEBUG2(PRU_CLOSE);
 972         }
 973         if (!(inp->inp_vflag & INP_DROPPED)) {
 974                 SOCK_LOCK(so);
 975                 so->so_state |= SS_PROTOREF;
 976                 SOCK_UNLOCK(so);
 977                 inp->inp_vflag |= INP_SOCKREF;
 978         }
 979         INP_UNLOCK(inp);
 980         INP_INFO_WUNLOCK(&tcbinfo);
 981 }
 982
 983 /*
 984  * Receive out-of-band data.
 985  */
 986 static int
 987 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
 988 {
 989         int error = 0;
 990         struct inpcb *inp;
 991         struct tcpcb *tp = NULL;
 992
 993         TCPDEBUG0;
 994         inp = sotoinpcb(so);
 995         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
 996         INP_LOCK(inp);
 997         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 998                 error = ECONNRESET;
 999                 goto out;
1000         }
1001         tp = intotcpcb(inp);
1002         TCPDEBUG1();
1003         if ((so->so_oobmark == 0 &&
1004              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1005             so->so_options & SO_OOBINLINE ||
1006             tp->t_oobflags & TCPOOB_HADDATA) {
1007                 error = EINVAL;
1008                 goto out;
1009         }
1010         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1011                 error = EWOULDBLOCK;
1012                 goto out;
1013         }
1014         m->m_len = 1;
1015         *mtod(m, caddr_t) = tp->t_iobc;
1016         if ((flags & MSG_PEEK) == 0)
1017                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1018
1019 out:
1020         TCPDEBUG2(PRU_RCVOOB);
1021         INP_UNLOCK(inp);
1022         return (error);
1023 }
1024
1025 struct pr_usrreqs tcp_usrreqs = {
1026         .pru_abort =            tcp_usr_abort,
1027         .pru_accept =           tcp_usr_accept,
1028         .pru_attach =           tcp_usr_attach,
1029         .pru_bind =             tcp_usr_bind,
1030         .pru_connect =          tcp_usr_connect,
1031         .pru_control =          in_control,
1032         .pru_detach =           tcp_usr_detach,
1033         .pru_disconnect =       tcp_usr_disconnect,
1034         .pru_listen =           tcp_usr_listen,
1035         .pru_peeraddr =         in_getpeeraddr,
1036         .pru_rcvd =             tcp_usr_rcvd,
1037         .pru_rcvoob =           tcp_usr_rcvoob,
1038         .pru_send =             tcp_usr_send,
1039         .pru_shutdown =         tcp_usr_shutdown,
1040         .pru_sockaddr =         in_getsockaddr,
1041         .pru_sosetlabel =       in_pcbsosetlabel,
1042         .pru_close =            tcp_usr_close,
1043 };
1044
1045 #ifdef INET6
1046 struct pr_usrreqs tcp6_usrreqs = {
1047         .pru_abort =            tcp_usr_abort,
1048         .pru_accept =           tcp6_usr_accept,
1049         .pru_attach =           tcp_usr_attach,
1050         .pru_bind =             tcp6_usr_bind,
1051         .pru_connect =          tcp6_usr_connect,
1052         .pru_control =          in6_control,
1053         .pru_detach =           tcp_usr_detach,
1054         .pru_disconnect =       tcp_usr_disconnect,
1055         .pru_listen =           tcp6_usr_listen,
1056         .pru_peeraddr =         in6_mapped_peeraddr,
1057         .pru_rcvd =             tcp_usr_rcvd,
1058         .pru_rcvoob =           tcp_usr_rcvoob,
1059         .pru_send =             tcp_usr_send,
1060         .pru_shutdown =         tcp_usr_shutdown,
1061         .pru_sockaddr =         in6_mapped_sockaddr,
1062         .pru_sosetlabel =       in_pcbsosetlabel,
1063         .pru_close =            tcp_usr_close,
1064 };
1065 #endif /* INET6 */
1066
1067 /*
1068  * Common subroutine to open a TCP connection to remote host specified
1069  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1070  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1071  * to choose a local host address (interface).  If there is an existing
1072  * incarnation of the same connection in TIME-WAIT state and if the remote
1073  * host was sending CC options and if the connection duration was < MSL, then
1074  * truncate the previous TIME-WAIT state and proceed.
1075  * Initialize connection parameters and enter SYN-SENT state.
1076  */
1077 static int
1078 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1079 {
1080         struct inpcb *inp = tp->t_inpcb, *oinp;
1081         struct socket *so = inp->inp_socket;
1082         struct in_addr laddr;
1083         u_short lport;
1084         int error;
1085
1086         INP_INFO_WLOCK_ASSERT(&tcbinfo);
1087         INP_LOCK_ASSERT(inp);
1088
1089         if (inp->inp_lport == 0) {
1090                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1091                 if (error)
1092                         return error;
1093         }
1094
1095         /*
1096          * Cannot simply call in_pcbconnect, because there might be an
1097          * earlier incarnation of this same connection still in
1098          * TIME_WAIT state, creating an ADDRINUSE error.
1099          */
1100         laddr = inp->inp_laddr;
1101         lport = inp->inp_lport;
1102         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1103             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1104         if (error && oinp == NULL)
1105                 return error;
1106         if (oinp)
1107                 return EADDRINUSE;
1108         inp->inp_laddr = laddr;
1109         in_pcbrehash(inp);
1110
1111         /*
1112          * Compute window scaling to request:
1113          * Scale to fit into sweet spot.  See tcp_syncache.c.
1114          * XXX: This should move to tcp_output().
1115          */
1116         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1117             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1118                 tp->request_r_scale++;
1119
1120         soisconnecting(so);
1121         tcpstat.tcps_connattempt++;
1122         tp->t_state = TCPS_SYN_SENT;
1123         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1124         tp->iss = tcp_new_isn(tp);
1125         tp->t_bw_rtseq = tp->iss;
1126         tcp_sendseqinit(tp);
1127
1128         return 0;
1129 }
1130
1131 #ifdef INET6
1132 static int
1133 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1134 {
1135         struct inpcb *inp = tp->t_inpcb, *oinp;
1136         struct socket *so = inp->inp_socket;
1137         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1138         struct in6_addr *addr6;
1139         int error;
1140
1141         INP_INFO_WLOCK_ASSERT(&tcbinfo);
1142         INP_LOCK_ASSERT(inp);
1143
1144         if (inp->inp_lport == 0) {
1145                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1146                 if (error)
1147                         return error;
1148         }
1149
1150         /*
1151          * Cannot simply call in_pcbconnect, because there might be an
1152          * earlier incarnation of this same connection still in
1153          * TIME_WAIT state, creating an ADDRINUSE error.
1154          * in6_pcbladdr() also handles scope zone IDs.
1155          */
1156         error = in6_pcbladdr(inp, nam, &addr6);
1157         if (error)
1158                 return error;
1159         oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1160                                   &sin6->sin6_addr, sin6->sin6_port,
1161                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1162                                   ? addr6
1163                                   : &inp->in6p_laddr,
1164                                   inp->inp_lport,  0, NULL);
1165         if (oinp)
1166                 return EADDRINUSE;
1167         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1168                 inp->in6p_laddr = *addr6;
1169         inp->in6p_faddr = sin6->sin6_addr;
1170         inp->inp_fport = sin6->sin6_port;
1171         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1172         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
1173         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
1174                 inp->in6p_flowinfo |=
1175                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1176         in_pcbrehash(inp);
1177
1178         /* Compute window scaling to request.  */
1179         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1180             (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
1181                 tp->request_r_scale++;
1182
1183         soisconnecting(so);
1184         tcpstat.tcps_connattempt++;
1185         tp->t_state = TCPS_SYN_SENT;
1186         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1187         tp->iss = tcp_new_isn(tp);
1188         tp->t_bw_rtseq = tp->iss;
1189         tcp_sendseqinit(tp);
1190
1191         return 0;
1192 }
1193 #endif /* INET6 */
1194
1195 /*
1196  * Export TCP internal state information via a struct tcp_info, based on the
1197  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1198  * (TCP state machine, etc).  We export all information using FreeBSD-native
1199  * constants -- for example, the numeric values for tcpi_state will differ
1200  * from Linux.
1201  */
1202 static void
1203 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1204 {
1205
1206         INP_LOCK_ASSERT(tp->t_inpcb);
1207         bzero(ti, sizeof(*ti));
1208
1209         ti->tcpi_state = tp->t_state;
1210         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1211                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1212         if (tp->t_flags & TF_SACK_PERMIT)
1213                 ti->tcpi_options |= TCPI_OPT_SACK;
1214         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1215                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1216                 ti->tcpi_snd_wscale = tp->snd_scale;
1217                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1218         }
1219
1220         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1221         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1222
1223         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1224         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1225
1226         /*
1227          * FreeBSD-specific extension fields for tcp_info.
1228          */
1229         ti->tcpi_rcv_space = tp->rcv_wnd;
1230         ti->tcpi_snd_wnd = tp->snd_wnd;
1231         ti->tcpi_snd_bwnd = tp->snd_bwnd;
1232 }
1233
1234 /*
1235  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1236  * socket option arguments.  When it re-acquires the lock after the copy, it
1237  * has to revalidate that the connection is still valid for the socket
1238  * option.
1239  */
1240 #define INP_LOCK_RECHECK(inp) do {                                      \
1241         INP_LOCK(inp);                                                  \
1242         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {            \
1243                 INP_UNLOCK(inp);                                        \
1244                 return (ECONNRESET);                                    \
1245         }                                                               \
1246         tp = intotcpcb(inp);                                            \
1247 } while(0)
1248
1249 int
1250 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1251 {
1252         int     error, opt, optval;
1253         struct  inpcb *inp;
1254         struct  tcpcb *tp;
1255         struct  tcp_info ti;
1256
1257         error = 0;
1258         inp = sotoinpcb(so);
1259         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1260         INP_LOCK(inp);
1261         if (sopt->sopt_level != IPPROTO_TCP) {
1262 #ifdef INET6
1263                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
1264                         INP_UNLOCK(inp);
1265                         error = ip6_ctloutput(so, sopt);
1266                 } else {
1267 #endif /* INET6 */
1268                         INP_UNLOCK(inp);
1269                         error = ip_ctloutput(so, sopt);
1270 #ifdef INET6
1271                 }
1272 #endif
1273                 return (error);
1274         }
1275         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
1276                 INP_UNLOCK(inp);
1277                 return (ECONNRESET);
1278         }
1279
1280         switch (sopt->sopt_dir) {
1281         case SOPT_SET:
1282                 switch (sopt->sopt_name) {
1283 #ifdef TCP_SIGNATURE
1284                 case TCP_MD5SIG:
1285                         INP_UNLOCK(inp);
1286                         error = sooptcopyin(sopt, &optval, sizeof optval,
1287                             sizeof optval);
1288                         if (error)
1289                                 return (error);
1290
1291                         INP_LOCK_RECHECK(inp);
1292                         if (optval > 0)
1293                                 tp->t_flags |= TF_SIGNATURE;
1294                         else
1295                                 tp->t_flags &= ~TF_SIGNATURE;
1296                         INP_UNLOCK(inp);
1297                         break;
1298 #endif /* TCP_SIGNATURE */
1299                 case TCP_NODELAY:
1300                 case TCP_NOOPT:
1301                         INP_UNLOCK(inp);
1302                         error = sooptcopyin(sopt, &optval, sizeof optval,
1303                             sizeof optval);
1304                         if (error)
1305                                 return (error);
1306
1307                         INP_LOCK_RECHECK(inp);
1308                         switch (sopt->sopt_name) {
1309                         case TCP_NODELAY:
1310                                 opt = TF_NODELAY;
1311                                 break;
1312                         case TCP_NOOPT:
1313                                 opt = TF_NOOPT;
1314                                 break;
1315                         default:
1316                                 opt = 0; /* dead code to fool gcc */
1317                                 break;
1318                         }
1319
1320                         if (optval)
1321                                 tp->t_flags |= opt;
1322                         else
1323                                 tp->t_flags &= ~opt;
1324                         INP_UNLOCK(inp);
1325                         break;
1326
1327                 case TCP_NOPUSH:
1328                         INP_UNLOCK(inp);
1329                         error = sooptcopyin(sopt, &optval, sizeof optval,
1330                             sizeof optval);
1331                         if (error)
1332                                 return (error);
1333
1334                         INP_LOCK_RECHECK(inp);
1335                         if (optval)
1336                                 tp->t_flags |= TF_NOPUSH;
1337                         else {
1338                                 tp->t_flags &= ~TF_NOPUSH;
1339                                 error = tcp_output(tp);
1340                         }
1341                         INP_UNLOCK(inp);
1342                         break;
1343
1344                 case TCP_MAXSEG:
1345                         INP_UNLOCK(inp);
1346                         error = sooptcopyin(sopt, &optval, sizeof optval,
1347                             sizeof optval);
1348                         if (error)
1349                                 return (error);
1350
1351                         INP_LOCK_RECHECK(inp);
1352                         if (optval > 0 && optval <= tp->t_maxseg &&
1353                             optval + 40 >= tcp_minmss)
1354                                 tp->t_maxseg = optval;
1355                         else
1356                                 error = EINVAL;
1357                         INP_UNLOCK(inp);
1358                         break;
1359
1360                 case TCP_INFO:
1361                         INP_UNLOCK(inp);
1362                         error = EINVAL;
1363                         break;
1364
1365                 default:
1366                         INP_UNLOCK(inp);
1367                         error = ENOPROTOOPT;
1368                         break;
1369                 }
1370                 break;
1371
1372         case SOPT_GET:
1373                 tp = intotcpcb(inp);
1374                 switch (sopt->sopt_name) {
1375 #ifdef TCP_SIGNATURE
1376                 case TCP_MD5SIG:
1377                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1378                         INP_UNLOCK(inp);
1379                         error = sooptcopyout(sopt, &optval, sizeof optval);
1380                         break;
1381 #endif
1382
1383                 case TCP_NODELAY:
1384                         optval = tp->t_flags & TF_NODELAY;
1385                         INP_UNLOCK(inp);
1386                         error = sooptcopyout(sopt, &optval, sizeof optval);
1387                         break;
1388                 case TCP_MAXSEG:
1389                         optval = tp->t_maxseg;
1390                         INP_UNLOCK(inp);
1391                         error = sooptcopyout(sopt, &optval, sizeof optval);
1392                         break;
1393                 case TCP_NOOPT:
1394                         optval = tp->t_flags & TF_NOOPT;
1395                         INP_UNLOCK(inp);
1396                         error = sooptcopyout(sopt, &optval, sizeof optval);
1397                         break;
1398                 case TCP_NOPUSH:
1399                         optval = tp->t_flags & TF_NOPUSH;
1400                         INP_UNLOCK(inp);
1401                         error = sooptcopyout(sopt, &optval, sizeof optval);
1402                         break;
1403                 case TCP_INFO:
1404                         tcp_fill_info(tp, &ti);
1405                         INP_UNLOCK(inp);
1406                         error = sooptcopyout(sopt, &ti, sizeof ti);
1407                         break;
1408                 default:
1409                         INP_UNLOCK(inp);
1410                         error = ENOPROTOOPT;
1411                         break;
1412                 }
1413                 break;
1414         }
1415         return (error);
1416 }
1417 #undef INP_LOCK_RECHECK
1418
1419 /*
1420  * tcp_sendspace and tcp_recvspace are the default send and receive window
1421  * sizes, respectively.  These are obsolescent (this information should
1422  * be set by the route).
1423  */
1424 u_long  tcp_sendspace = 1024*32;
1425 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1426     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1427 u_long  tcp_recvspace = 1024*64;
1428 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1429     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1430
1431 /*
1432  * Attach TCP protocol to socket, allocating
1433  * internet protocol control block, tcp control block,
1434  * bufer space, and entering LISTEN state if to accept connections.
1435  */
1436 static int
1437 tcp_attach(struct socket *so)
1438 {
1439         struct tcpcb *tp;
1440         struct inpcb *inp;
1441         int error;
1442 #ifdef INET6
1443         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1444 #endif
1445
1446         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1447                 error = soreserve(so, tcp_sendspace, tcp_recvspace);
1448                 if (error)
1449                         return (error);
1450         }
1451         so->so_rcv.sb_flags |= SB_AUTOSIZE;
1452         so->so_snd.sb_flags |= SB_AUTOSIZE;
1453         INP_INFO_WLOCK(&tcbinfo);
1454         error = in_pcballoc(so, &tcbinfo);
1455         if (error) {
1456                 INP_INFO_WUNLOCK(&tcbinfo);
1457                 return (error);
1458         }
1459         inp = sotoinpcb(so);
1460 #ifdef INET6
1461         if (isipv6) {
1462                 inp->inp_vflag |= INP_IPV6;
1463                 inp->in6p_hops = -1;    /* use kernel default */
1464         }
1465         else
1466 #endif
1467         inp->inp_vflag |= INP_IPV4;
1468         tp = tcp_newtcpcb(inp);
1469         if (tp == NULL) {
1470 #ifdef INET6
1471                 if (isipv6) {
1472                         in6_pcbdetach(inp);
1473                         in6_pcbfree(inp);
1474                 } else {
1475 #endif
1476                         in_pcbdetach(inp);
1477                         in_pcbfree(inp);
1478 #ifdef INET6
1479                 }
1480 #endif
1481                 INP_INFO_WUNLOCK(&tcbinfo);
1482                 return (ENOBUFS);
1483         }
1484         tp->t_state = TCPS_CLOSED;
1485         INP_UNLOCK(inp);
1486         INP_INFO_WUNLOCK(&tcbinfo);
1487         return (0);
1488 }
1489
1490 /*
1491  * Initiate (or continue) disconnect.
1492  * If embryonic state, just send reset (once).
1493  * If in ``let data drain'' option and linger null, just drop.
1494  * Otherwise (hard), mark socket disconnecting and drop
1495  * current input data; switch states based on user close, and
1496  * send segment to peer (with FIN).
1497  */
1498 static void
1499 tcp_disconnect(struct tcpcb *tp)
1500 {
1501         struct inpcb *inp = tp->t_inpcb;
1502         struct socket *so = inp->inp_socket;
1503
1504         INP_INFO_WLOCK_ASSERT(&tcbinfo);
1505         INP_LOCK_ASSERT(inp);
1506
1507         /*
1508          * Neither tcp_close() nor tcp_drop() should return NULL, as the
1509          * socket is still open.
1510          */
1511         if (tp->t_state < TCPS_ESTABLISHED) {
1512                 tp = tcp_close(tp);
1513                 KASSERT(tp != NULL,
1514                     ("tcp_disconnect: tcp_close() returned NULL"));
1515         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1516                 tp = tcp_drop(tp, 0);
1517                 KASSERT(tp != NULL,
1518                     ("tcp_disconnect: tcp_drop() returned NULL"));
1519         } else {
1520                 soisdisconnecting(so);
1521                 sbflush(&so->so_rcv);
1522                 tcp_usrclosed(tp);
1523                 if (!(inp->inp_vflag & INP_DROPPED))
1524                         tcp_output_disconnect(tp);
1525         }
1526 }
1527
1528 /*
1529  * User issued close, and wish to trail through shutdown states:
1530  * if never received SYN, just forget it.  If got a SYN from peer,
1531  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1532  * If already got a FIN from peer, then almost done; go to LAST_ACK
1533  * state.  In all other cases, have already sent FIN to peer (e.g.
1534  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1535  * for peer to send FIN or not respond to keep-alives, etc.
1536  * We can let the user exit from the close as soon as the FIN is acked.
1537  */
1538 static void
1539 tcp_usrclosed(struct tcpcb *tp)
1540 {
1541
1542         INP_INFO_WLOCK_ASSERT(&tcbinfo);
1543         INP_LOCK_ASSERT(tp->t_inpcb);
1544
1545         switch (tp->t_state) {
1546         case TCPS_LISTEN:
1547                 tcp_offload_listen_close(tp);
1548                 /* FALLTHROUGH */
1549         case TCPS_CLOSED:
1550                 tp->t_state = TCPS_CLOSED;
1551                 tp = tcp_close(tp);
1552                 /*
1553                  * tcp_close() should never return NULL here as the socket is
1554                  * still open.
1555                  */
1556                 KASSERT(tp != NULL,
1557                     ("tcp_usrclosed: tcp_close() returned NULL"));
1558                 break;
1559
1560         case TCPS_SYN_SENT:
1561         case TCPS_SYN_RECEIVED:
1562                 tp->t_flags |= TF_NEEDFIN;
1563                 break;
1564
1565         case TCPS_ESTABLISHED:
1566                 tp->t_state = TCPS_FIN_WAIT_1;
1567                 break;
1568
1569         case TCPS_CLOSE_WAIT:
1570                 tp->t_state = TCPS_LAST_ACK;
1571                 break;
1572         }
1573         if (tp->t_state >= TCPS_FIN_WAIT_2) {
1574                 soisdisconnected(tp->t_inpcb->inp_socket);
1575                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1576                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1577                         int timeout;
1578
1579                         timeout = (tcp_fast_finwait2_recycle) ?
1580                             tcp_finwait2_timeout : tcp_maxidle;
1581                         tcp_timer_activate(tp, TT_2MSL, timeout);
1582                 }
1583         }
1584 }
1585
1586 #ifdef DDB
1587 static void
1588 db_print_indent(int indent)
1589 {
1590         int i;
1591
1592         for (i = 0; i < indent; i++)
1593                 db_printf(" ");
1594 }
1595
1596 static void
1597 db_print_tstate(int t_state)
1598 {
1599
1600         switch (t_state) {
1601         case TCPS_CLOSED:
1602                 db_printf("TCPS_CLOSED");
1603                 return;
1604
1605         case TCPS_LISTEN:
1606                 db_printf("TCPS_LISTEN");
1607                 return;
1608
1609         case TCPS_SYN_SENT:
1610                 db_printf("TCPS_SYN_SENT");
1611                 return;
1612
1613         case TCPS_SYN_RECEIVED:
1614                 db_printf("TCPS_SYN_RECEIVED");
1615                 return;
1616
1617         case TCPS_ESTABLISHED:
1618                 db_printf("TCPS_ESTABLISHED");
1619                 return;
1620
1621         case TCPS_CLOSE_WAIT:
1622                 db_printf("TCPS_CLOSE_WAIT");
1623                 return;
1624
1625         case TCPS_FIN_WAIT_1:
1626                 db_printf("TCPS_FIN_WAIT_1");
1627                 return;
1628
1629         case TCPS_CLOSING:
1630                 db_printf("TCPS_CLOSING");
1631                 return;
1632
1633         case TCPS_LAST_ACK:
1634                 db_printf("TCPS_LAST_ACK");
1635                 return;
1636
1637         case TCPS_FIN_WAIT_2:
1638                 db_printf("TCPS_FIN_WAIT_2");
1639                 return;
1640
1641         case TCPS_TIME_WAIT:
1642                 db_printf("TCPS_TIME_WAIT");
1643                 return;
1644
1645         default:
1646                 db_printf("unknown");
1647                 return;
1648         }
1649 }
1650
1651 static void
1652 db_print_tflags(u_int t_flags)
1653 {
1654         int comma;
1655
1656         comma = 0;
1657         if (t_flags & TF_ACKNOW) {
1658                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1659                 comma = 1;
1660         }
1661         if (t_flags & TF_DELACK) {
1662                 db_printf("%sTF_DELACK", comma ? ", " : "");
1663                 comma = 1;
1664         }
1665         if (t_flags & TF_NODELAY) {
1666                 db_printf("%sTF_NODELAY", comma ? ", " : "");
1667                 comma = 1;
1668         }
1669         if (t_flags & TF_NOOPT) {
1670                 db_printf("%sTF_NOOPT", comma ? ", " : "");
1671                 comma = 1;
1672         }
1673         if (t_flags & TF_SENTFIN) {
1674                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1675                 comma = 1;
1676         }
1677         if (t_flags & TF_REQ_SCALE) {
1678                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1679                 comma = 1;
1680         }
1681         if (t_flags & TF_RCVD_SCALE) {
1682                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1683                 comma = 1;
1684         }
1685         if (t_flags & TF_REQ_TSTMP) {
1686                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1687                 comma = 1;
1688         }
1689         if (t_flags & TF_RCVD_TSTMP) {
1690                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1691                 comma = 1;
1692         }
1693         if (t_flags & TF_SACK_PERMIT) {
1694                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1695                 comma = 1;
1696         }
1697         if (t_flags & TF_NEEDSYN) {
1698                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1699                 comma = 1;
1700         }
1701         if (t_flags & TF_NEEDFIN) {
1702                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1703                 comma = 1;
1704         }
1705         if (t_flags & TF_NOPUSH) {
1706                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1707                 comma = 1;
1708         }
1709         if (t_flags & TF_NOPUSH) {
1710                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1711                 comma = 1;
1712         }
1713         if (t_flags & TF_MORETOCOME) {
1714                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1715                 comma = 1;
1716         }
1717         if (t_flags & TF_LQ_OVERFLOW) {
1718                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1719                 comma = 1;
1720         }
1721         if (t_flags & TF_LASTIDLE) {
1722                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1723                 comma = 1;
1724         }
1725         if (t_flags & TF_RXWIN0SENT) {
1726                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1727                 comma = 1;
1728         }
1729         if (t_flags & TF_FASTRECOVERY) {
1730                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1731                 comma = 1;
1732         }
1733         if (t_flags & TF_WASFRECOVERY) {
1734                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1735                 comma = 1;
1736         }
1737         if (t_flags & TF_SIGNATURE) {
1738                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1739                 comma = 1;
1740         }
1741         if (t_flags & TF_FORCEDATA) {
1742                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1743                 comma = 1;
1744         }
1745         if (t_flags & TF_TSO) {
1746                 db_printf("%sTF_TSO", comma ? ", " : "");
1747                 comma = 1;
1748         }
1749 }
1750
1751 static void
1752 db_print_toobflags(char t_oobflags)
1753 {
1754         int comma;
1755
1756         comma = 0;
1757         if (t_oobflags & TCPOOB_HAVEDATA) {
1758                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1759                 comma = 1;
1760         }
1761         if (t_oobflags & TCPOOB_HADDATA) {
1762                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1763                 comma = 1;
1764         }
1765 }
1766
1767 static void
1768 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1769 {
1770
1771         db_print_indent(indent);
1772         db_printf("%s at %p\n", name, tp);
1773
1774         indent += 2;
1775
1776         db_print_indent(indent);
1777         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
1778            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1779
1780         db_print_indent(indent);
1781         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
1782             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1783
1784         db_print_indent(indent);
1785         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1786             &tp->t_timers->tt_delack, tp->t_inpcb);
1787
1788         db_print_indent(indent);
1789         db_printf("t_state: %d (", tp->t_state);
1790         db_print_tstate(tp->t_state);
1791         db_printf(")\n");
1792
1793         db_print_indent(indent);
1794         db_printf("t_flags: 0x%x (", tp->t_flags);
1795         db_print_tflags(tp->t_flags);
1796         db_printf(")\n");
1797
1798         db_print_indent(indent);
1799         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
1800             tp->snd_una, tp->snd_max, tp->snd_nxt);
1801
1802         db_print_indent(indent);
1803         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
1804            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1805
1806         db_print_indent(indent);
1807         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
1808             tp->iss, tp->irs, tp->rcv_nxt);
1809
1810         db_print_indent(indent);
1811         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
1812             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1813
1814         db_print_indent(indent);
1815         db_printf("snd_wnd: %lu   snd_cwnd: %lu   snd_bwnd: %lu\n",
1816            tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
1817
1818         db_print_indent(indent);
1819         db_printf("snd_ssthresh: %lu   snd_bandwidth: %lu   snd_recover: "
1820             "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
1821             tp->snd_recover);
1822
1823         db_print_indent(indent);
1824         db_printf("t_maxopd: %u   t_rcvtime: %lu   t_startime: %lu\n",
1825             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1826
1827         db_print_indent(indent);
1828         db_printf("t_rttime: %d   t_rtsq: 0x%08x   t_bw_rtttime: %d\n",
1829             tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
1830
1831         db_print_indent(indent);
1832         db_printf("t_bw_rtseq: 0x%08x   t_rxtcur: %d   t_maxseg: %u   "
1833             "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
1834             tp->t_srtt);
1835
1836         db_print_indent(indent);
1837         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
1838             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
1839             tp->t_rttbest);
1840
1841         db_print_indent(indent);
1842         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
1843             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
1844
1845         db_print_indent(indent);
1846         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
1847         db_print_toobflags(tp->t_oobflags);
1848         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
1849
1850         db_print_indent(indent);
1851         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
1852             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
1853
1854         db_print_indent(indent);
1855         db_printf("ts_recent: %u   ts_recent_age: %lu\n",
1856             tp->ts_recent, tp->ts_recent_age);
1857
1858         db_print_indent(indent);
1859         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
1860             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
1861
1862         db_print_indent(indent);
1863         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
1864             "t_badrxtwin: %lu\n", tp->snd_ssthresh_prev,
1865             tp->snd_recover_prev, tp->t_badrxtwin);
1866
1867         db_print_indent(indent);
1868         db_printf("snd_numholes: %d  snd_holes first: %p\n",
1869             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
1870
1871         db_print_indent(indent);
1872         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
1873             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
1874
1875         /* Skip sackblks, sackhint. */
1876
1877         db_print_indent(indent);
1878         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
1879             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
1880 }
1881
1882 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
1883 {
1884         struct tcpcb *tp;
1885
1886         if (!have_addr) {
1887                 db_printf("usage: show tcpcb <addr>\n");
1888                 return;
1889         }
1890         tp = (struct tcpcb *)addr;
1891
1892         db_print_tcpcb(tp, "tcpcb", 0);
1893 }
1894 #endif