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_INFO_RLOCK(&tcbinfo);
 609         INP_LOCK(inp);
 610         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 611                 error = ECONNABORTED;
 612                 goto out;
 613         }
 614         tp = intotcpcb(inp);
 615         TCPDEBUG1();
 616
 617         /*
 618          * We inline in_getpeeraddr and COMMON_END here, so that we can
 619          * copy the data of interest and defer the malloc until after we
 620          * release the lock.
 621          */
 622         port = inp->inp_fport;
 623         addr = inp->inp_faddr;
 624
 625 out:
 626         TCPDEBUG2(PRU_ACCEPT);
 627         INP_UNLOCK(inp);
 628         INP_INFO_RUNLOCK(&tcbinfo);
 629         if (error == 0)
 630                 *nam = in_sockaddr(port, &addr);
 631         return error;
 632 }
 633
 634 #ifdef INET6
 635 static int
 636 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 637 {
 638         struct inpcb *inp = NULL;
 639         int error = 0;
 640         struct tcpcb *tp = NULL;
 641         struct in_addr addr;
 642         struct in6_addr addr6;
 643         in_port_t port = 0;
 644         int v4 = 0;
 645         TCPDEBUG0;
 646
 647         if (so->so_state & SS_ISDISCONNECTED)
 648                 return (ECONNABORTED);
 649
 650         inp = sotoinpcb(so);
 651         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 652         INP_LOCK(inp);
 653         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 654                 error = ECONNABORTED;
 655                 goto out;
 656         }
 657         tp = intotcpcb(inp);
 658         TCPDEBUG1();
 659
 660         /*
 661          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 662          * copy the data of interest and defer the malloc until after we
 663          * release the lock.
 664          */
 665         if (inp->inp_vflag & INP_IPV4) {
 666                 v4 = 1;
 667                 port = inp->inp_fport;
 668                 addr = inp->inp_faddr;
 669         } else {
 670                 port = inp->inp_fport;
 671                 addr6 = inp->in6p_faddr;
 672         }
 673
 674 out:
 675         TCPDEBUG2(PRU_ACCEPT);
 676         INP_UNLOCK(inp);
 677         if (error == 0) {
 678                 if (v4)
 679                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 680                 else
 681                         *nam = in6_sockaddr(port, &addr6);
 682         }
 683         return error;
 684 }
 685 #endif /* INET6 */
 686
 687 /*
 688  * Mark the connection as being incapable of further output.
 689  */
 690 static int
 691 tcp_usr_shutdown(struct socket *so)
 692 {
 693         int error = 0;
 694         struct inpcb *inp;
 695         struct tcpcb *tp = NULL;
 696
 697         TCPDEBUG0;
 698         INP_INFO_WLOCK(&tcbinfo);
 699         inp = sotoinpcb(so);
 700         KASSERT(inp != NULL, ("inp == NULL"));
 701         INP_LOCK(inp);
 702         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 703                 error = ECONNRESET;
 704                 goto out;
 705         }
 706         tp = intotcpcb(inp);
 707         TCPDEBUG1();
 708         socantsendmore(so);
 709         tcp_usrclosed(tp);
 710         error = tcp_output_disconnect(tp);
 711
 712 out:
 713         TCPDEBUG2(PRU_SHUTDOWN);
 714         INP_UNLOCK(inp);
 715         INP_INFO_WUNLOCK(&tcbinfo);
 716
 717         return (error);
 718 }
 719
 720 /*
 721  * After a receive, possibly send window update to peer.
 722  */
 723 static int
 724 tcp_usr_rcvd(struct socket *so, int flags)
 725 {
 726         struct inpcb *inp;
 727         struct tcpcb *tp = NULL;
 728         int error = 0;
 729
 730         TCPDEBUG0;
 731         inp = sotoinpcb(so);
 732         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 733         INP_LOCK(inp);
 734         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 735                 error = ECONNRESET;
 736                 goto out;
 737         }
 738         tp = intotcpcb(inp);
 739         TCPDEBUG1();
 740         tcp_output_rcvd(tp);
 741
 742 out:
 743         TCPDEBUG2(PRU_RCVD);
 744         INP_UNLOCK(inp);
 745         return (error);
 746 }
 747
 748 /*
 749  * Do a send by putting data in output queue and updating urgent
 750  * marker if URG set.  Possibly send more data.  Unlike the other
 751  * pru_*() routines, the mbuf chains are our responsibility.  We
 752  * must either enqueue them or free them.  The other pru_* routines
 753  * generally are caller-frees.
 754  */
 755 static int
 756 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 757     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 758 {
 759         int error = 0;
 760         struct inpcb *inp;
 761         struct tcpcb *tp = NULL;
 762         int headlocked = 0;
 763 #ifdef INET6
 764         int isipv6;
 765 #endif
 766         TCPDEBUG0;
 767
 768         /*
 769          * We require the pcbinfo lock in two cases:
 770          *
 771          * (1) An implied connect is taking place, which can result in
 772          *     binding IPs and ports and hence modification of the pcb hash
 773          *     chains.
 774          *
 775          * (2) PRUS_EOF is set, resulting in explicit close on the send.
 776          */
 777         if ((nam != NULL) || (flags & PRUS_EOF)) {
 778                 INP_INFO_WLOCK(&tcbinfo);
 779                 headlocked = 1;
 780         }
 781         inp = sotoinpcb(so);
 782         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 783         INP_LOCK(inp);
 784         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 785                 if (control)
 786                         m_freem(control);
 787                 if (m)
 788                         m_freem(m);
 789                 error = ECONNRESET;
 790                 goto out;
 791         }
 792 #ifdef INET6
 793         isipv6 = nam && nam->sa_family == AF_INET6;
 794 #endif /* INET6 */
 795         tp = intotcpcb(inp);
 796         TCPDEBUG1();
 797         if (control) {
 798                 /* TCP doesn't do control messages (rights, creds, etc) */
 799                 if (control->m_len) {
 800                         m_freem(control);
 801                         if (m)
 802                                 m_freem(m);
 803                         error = EINVAL;
 804                         goto out;
 805                 }
 806                 m_freem(control);       /* empty control, just free it */
 807         }
 808         if (!(flags & PRUS_OOB)) {
 809                 sbappendstream(&so->so_snd, m);
 810                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 811                         /*
 812                          * Do implied connect if not yet connected,
 813                          * initialize window to default value, and
 814                          * initialize maxseg/maxopd using peer's cached
 815                          * MSS.
 816                          */
 817                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 818 #ifdef INET6
 819                         if (isipv6)
 820                                 error = tcp6_connect(tp, nam, td);
 821                         else
 822 #endif /* INET6 */
 823                         error = tcp_connect(tp, nam, td);
 824                         if (error)
 825                                 goto out;
 826                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 827                         tcp_mss(tp, -1);
 828                 }
 829                 if (flags & PRUS_EOF) {
 830                         /*
 831                          * Close the send side of the connection after
 832                          * the data is sent.
 833                          */
 834                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 835                         socantsendmore(so);
 836                         tcp_usrclosed(tp);
 837                 }
 838                 if (headlocked) {
 839                         INP_INFO_WUNLOCK(&tcbinfo);
 840                         headlocked = 0;
 841                 }
 842                 if (tp != NULL) {
 843                         if (flags & PRUS_MORETOCOME)
 844                                 tp->t_flags |= TF_MORETOCOME;
 845                         error = tcp_output_send(tp);
 846                         if (flags & PRUS_MORETOCOME)
 847                                 tp->t_flags &= ~TF_MORETOCOME;
 848                 }
 849         } else {
 850                 /*
 851                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 852                  */
 853                 SOCKBUF_LOCK(&so->so_snd);
 854                 if (sbspace(&so->so_snd) < -512) {
 855                         SOCKBUF_UNLOCK(&so->so_snd);
 856                         m_freem(m);
 857                         error = ENOBUFS;
 858                         goto out;
 859                 }
 860                 /*
 861                  * According to RFC961 (Assigned Protocols),
 862                  * the urgent pointer points to the last octet
 863                  * of urgent data.  We continue, however,
 864                  * to consider it to indicate the first octet
 865                  * of data past the urgent section.
 866                  * Otherwise, snd_up should be one lower.
 867                  */
 868                 sbappendstream_locked(&so->so_snd, m);
 869                 SOCKBUF_UNLOCK(&so->so_snd);
 870                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 871                         /*
 872                          * Do implied connect if not yet connected,
 873                          * initialize window to default value, and
 874                          * initialize maxseg/maxopd using peer's cached
 875                          * MSS.
 876                          */
 877                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 878 #ifdef INET6
 879                         if (isipv6)
 880                                 error = tcp6_connect(tp, nam, td);
 881                         else
 882 #endif /* INET6 */
 883                         error = tcp_connect(tp, nam, td);
 884                         if (error)
 885                                 goto out;
 886                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 887                         tcp_mss(tp, -1);
 888                         INP_INFO_WUNLOCK(&tcbinfo);
 889                         headlocked = 0;
 890                 } else if (nam) {
 891                         INP_INFO_WUNLOCK(&tcbinfo);
 892                         headlocked = 0;
 893                 }
 894                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 895                 tp->t_flags |= TF_FORCEDATA;
 896                 error = tcp_output_send(tp);
 897                 tp->t_flags &= ~TF_FORCEDATA;
 898         }
 899 out:
 900         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
 901                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 902         INP_UNLOCK(inp);
 903         if (headlocked)
 904                 INP_INFO_WUNLOCK(&tcbinfo);
 905         return (error);
 906 }
 907
 908 /*
 909  * Abort the TCP.  Drop the connection abruptly.
 910  */
 911 static void
 912 tcp_usr_abort(struct socket *so)
 913 {
 914         struct inpcb *inp;
 915         struct tcpcb *tp = NULL;
 916         TCPDEBUG0;
 917
 918         inp = sotoinpcb(so);
 919         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
 920
 921         INP_INFO_WLOCK(&tcbinfo);
 922         INP_LOCK(inp);
 923         KASSERT(inp->inp_socket != NULL,
 924             ("tcp_usr_abort: inp_socket == NULL"));
 925
 926         /*
 927          * If we still have full TCP state, and we're not dropped, drop.
 928          */
 929         if (!(inp->inp_vflag & INP_TIMEWAIT) &&
 930             !(inp->inp_vflag & INP_DROPPED)) {
 931                 tp = intotcpcb(inp);
 932                 TCPDEBUG1();
 933                 tcp_drop(tp, ECONNABORTED);
 934                 TCPDEBUG2(PRU_ABORT);
 935         }
 936         if (!(inp->inp_vflag & INP_DROPPED)) {
 937                 SOCK_LOCK(so);
 938                 so->so_state |= SS_PROTOREF;
 939                 SOCK_UNLOCK(so);
 940                 inp->inp_vflag |= INP_SOCKREF;
 941         }
 942         INP_UNLOCK(inp);
 943         INP_INFO_WUNLOCK(&tcbinfo);
 944 }
 945
 946 /*
 947  * TCP socket is closed.  Start friendly disconnect.
 948  */
 949 static void
 950 tcp_usr_close(struct socket *so)
 951 {
 952         struct inpcb *inp;
 953         struct tcpcb *tp = NULL;
 954         TCPDEBUG0;
 955
 956         inp = sotoinpcb(so);
 957         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
 958
 959         INP_INFO_WLOCK(&tcbinfo);
 960         INP_LOCK(inp);
 961         KASSERT(inp->inp_socket != NULL,
 962             ("tcp_usr_close: inp_socket == NULL"));
 963
 964         /*
 965          * If we still have full TCP state, and we're not dropped, initiate
 966          * a disconnect.
 967          */
 968         if (!(inp->inp_vflag & INP_TIMEWAIT) &&
 969             !(inp->inp_vflag & INP_DROPPED)) {
 970                 tp = intotcpcb(inp);
 971                 TCPDEBUG1();
 972                 tcp_disconnect(tp);
 973                 TCPDEBUG2(PRU_CLOSE);
 974         }
 975         if (!(inp->inp_vflag & INP_DROPPED)) {
 976                 SOCK_LOCK(so);
 977                 so->so_state |= SS_PROTOREF;
 978                 SOCK_UNLOCK(so);
 979                 inp->inp_vflag |= INP_SOCKREF;
 980         }
 981         INP_UNLOCK(inp);
 982         INP_INFO_WUNLOCK(&tcbinfo);
 983 }
 984
 985 /*
 986  * Receive out-of-band data.
 987  */
 988 static int
 989 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
 990 {
 991         int error = 0;
 992         struct inpcb *inp;
 993         struct tcpcb *tp = NULL;
 994
 995         TCPDEBUG0;
 996         inp = sotoinpcb(so);
 997         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
 998         INP_LOCK(inp);
 999         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
1000                 error = ECONNRESET;
1001                 goto out;
1002         }
1003         tp = intotcpcb(inp);
1004         TCPDEBUG1();
1005         if ((so->so_oobmark == 0 &&
1006              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1007             so->so_options & SO_OOBINLINE ||
1008             tp->t_oobflags & TCPOOB_HADDATA) {
1009                 error = EINVAL;
1010                 goto out;
1011         }
1012         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1013                 error = EWOULDBLOCK;
1014                 goto out;
1015         }
1016         m->m_len = 1;
1017         *mtod(m, caddr_t) = tp->t_iobc;
1018         if ((flags & MSG_PEEK) == 0)
1019                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1020
1021 out:
1022         TCPDEBUG2(PRU_RCVOOB);
1023         INP_UNLOCK(inp);
1024         return (error);
1025 }
1026
1027 struct pr_usrreqs tcp_usrreqs = {
1028         .pru_abort =            tcp_usr_abort,
1029         .pru_accept =           tcp_usr_accept,
1030         .pru_attach =           tcp_usr_attach,
1031         .pru_bind =             tcp_usr_bind,
1032         .pru_connect =          tcp_usr_connect,
1033         .pru_control =          in_control,
1034         .pru_detach =           tcp_usr_detach,
1035         .pru_disconnect =       tcp_usr_disconnect,
1036         .pru_listen =           tcp_usr_listen,
1037         .pru_peeraddr =         in_getpeeraddr,
1038         .pru_rcvd =             tcp_usr_rcvd,
1039         .pru_rcvoob =           tcp_usr_rcvoob,
1040         .pru_send =             tcp_usr_send,
1041         .pru_shutdown =         tcp_usr_shutdown,
1042         .pru_sockaddr =         in_getsockaddr,
1043         .pru_sosetlabel =       in_pcbsosetlabel,
1044         .pru_close =            tcp_usr_close,
1045 };
1046
1047 #ifdef INET6
1048 struct pr_usrreqs tcp6_usrreqs = {
1049         .pru_abort =            tcp_usr_abort,
1050         .pru_accept =           tcp6_usr_accept,
1051         .pru_attach =           tcp_usr_attach,
1052         .pru_bind =             tcp6_usr_bind,
1053         .pru_connect =          tcp6_usr_connect,
1054         .pru_control =          in6_control,
1055         .pru_detach =           tcp_usr_detach,
1056         .pru_disconnect =       tcp_usr_disconnect,
1057         .pru_listen =           tcp6_usr_listen,
1058         .pru_peeraddr =         in6_mapped_peeraddr,
1059         .pru_rcvd =             tcp_usr_rcvd,
1060         .pru_rcvoob =           tcp_usr_rcvoob,
1061         .pru_send =             tcp_usr_send,
1062         .pru_shutdown =         tcp_usr_shutdown,
1063         .pru_sockaddr =         in6_mapped_sockaddr,
1064         .pru_sosetlabel =       in_pcbsosetlabel,
1065         .pru_close =            tcp_usr_close,
1066 };
1067 #endif /* INET6 */
1068
1069 /*
1070  * Common subroutine to open a TCP connection to remote host specified
1071  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1072  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1073  * to choose a local host address (interface).  If there is an existing
1074  * incarnation of the same connection in TIME-WAIT state and if the remote
1075  * host was sending CC options and if the connection duration was < MSL, then
1076  * truncate the previous TIME-WAIT state and proceed.
1077  * Initialize connection parameters and enter SYN-SENT state.
1078  */
1079 static int
1080 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1081 {
1082         struct inpcb *inp = tp->t_inpcb, *oinp;
1083         struct socket *so = inp->inp_socket;
1084         struct in_addr laddr;
1085         u_short lport;
1086         int error;
1087
1088         INP_INFO_WLOCK_ASSERT(&tcbinfo);
1089         INP_LOCK_ASSERT(inp);
1090
1091         if (inp->inp_lport == 0) {
1092                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1093                 if (error)
1094                         return error;
1095         }
1096
1097         /*
1098          * Cannot simply call in_pcbconnect, because there might be an
1099          * earlier incarnation of this same connection still in
1100          * TIME_WAIT state, creating an ADDRINUSE error.
1101          */
1102         laddr = inp->inp_laddr;
1103         lport = inp->inp_lport;
1104         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1105             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1106         if (error && oinp == NULL)
1107                 return error;
1108         if (oinp)
1109                 return EADDRINUSE;
1110         inp->inp_laddr = laddr;
1111         in_pcbrehash(inp);
1112
1113         /*
1114          * Compute window scaling to request:
1115          * Scale to fit into sweet spot.  See tcp_syncache.c.
1116          * XXX: This should move to tcp_output().
1117          */
1118         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1119             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1120                 tp->request_r_scale++;
1121
1122         soisconnecting(so);
1123         tcpstat.tcps_connattempt++;
1124         tp->t_state = TCPS_SYN_SENT;
1125         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1126         tp->iss = tcp_new_isn(tp);
1127         tp->t_bw_rtseq = tp->iss;
1128         tcp_sendseqinit(tp);
1129
1130         return 0;
1131 }
1132
1133 #ifdef INET6
1134 static int
1135 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1136 {
1137         struct inpcb *inp = tp->t_inpcb, *oinp;
1138         struct socket *so = inp->inp_socket;
1139         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1140         struct in6_addr *addr6;
1141         int error;
1142
1143         INP_INFO_WLOCK_ASSERT(&tcbinfo);
1144         INP_LOCK_ASSERT(inp);
1145
1146         if (inp->inp_lport == 0) {
1147                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1148                 if (error)
1149                         return error;
1150         }
1151
1152         /*
1153          * Cannot simply call in_pcbconnect, because there might be an
1154          * earlier incarnation of this same connection still in
1155          * TIME_WAIT state, creating an ADDRINUSE error.
1156          * in6_pcbladdr() also handles scope zone IDs.
1157          */
1158         error = in6_pcbladdr(inp, nam, &addr6);
1159         if (error)
1160                 return error;
1161         oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1162                                   &sin6->sin6_addr, sin6->sin6_port,
1163                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1164                                   ? addr6
1165                                   : &inp->in6p_laddr,
1166                                   inp->inp_lport,  0, NULL);
1167         if (oinp)
1168                 return EADDRINUSE;
1169         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1170                 inp->in6p_laddr = *addr6;
1171         inp->in6p_faddr = sin6->sin6_addr;
1172         inp->inp_fport = sin6->sin6_port;
1173         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1174         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
1175         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
1176                 inp->in6p_flowinfo |=
1177                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1178         in_pcbrehash(inp);
1179
1180         /* Compute window scaling to request.  */
1181         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1182             (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
1183                 tp->request_r_scale++;
1184
1185         soisconnecting(so);
1186         tcpstat.tcps_connattempt++;
1187         tp->t_state = TCPS_SYN_SENT;
1188         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1189         tp->iss = tcp_new_isn(tp);
1190         tp->t_bw_rtseq = tp->iss;
1191         tcp_sendseqinit(tp);
1192
1193         return 0;
1194 }
1195 #endif /* INET6 */
1196
1197 /*
1198  * Export TCP internal state information via a struct tcp_info, based on the
1199  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1200  * (TCP state machine, etc).  We export all information using FreeBSD-native
1201  * constants -- for example, the numeric values for tcpi_state will differ
1202  * from Linux.
1203  */
1204 static void
1205 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1206 {
1207
1208         INP_LOCK_ASSERT(tp->t_inpcb);
1209         bzero(ti, sizeof(*ti));
1210
1211         ti->tcpi_state = tp->t_state;
1212         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1213                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1214         if (tp->t_flags & TF_SACK_PERMIT)
1215                 ti->tcpi_options |= TCPI_OPT_SACK;
1216         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1217                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1218                 ti->tcpi_snd_wscale = tp->snd_scale;
1219                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1220         }
1221
1222         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1223         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1224
1225         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1226         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1227
1228         /*
1229          * FreeBSD-specific extension fields for tcp_info.
1230          */
1231         ti->tcpi_rcv_space = tp->rcv_wnd;
1232         ti->tcpi_snd_wnd = tp->snd_wnd;
1233         ti->tcpi_snd_bwnd = tp->snd_bwnd;
1234 }
1235
1236 /*
1237  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1238  * socket option arguments.  When it re-acquires the lock after the copy, it
1239  * has to revalidate that the connection is still valid for the socket
1240  * option.
1241  */
1242 #define INP_LOCK_RECHECK(inp) do {                                      \
1243         INP_LOCK(inp);                                                  \
1244         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {            \
1245                 INP_UNLOCK(inp);                                        \
1246                 return (ECONNRESET);                                    \
1247         }                                                               \
1248         tp = intotcpcb(inp);                                            \
1249 } while(0)
1250
1251 int
1252 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1253 {
1254         int     error, opt, optval;
1255         struct  inpcb *inp;
1256         struct  tcpcb *tp;
1257         struct  tcp_info ti;
1258
1259         error = 0;
1260         inp = sotoinpcb(so);
1261         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1262         INP_LOCK(inp);
1263         if (sopt->sopt_level != IPPROTO_TCP) {
1264 #ifdef INET6
1265                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
1266                         INP_UNLOCK(inp);
1267                         error = ip6_ctloutput(so, sopt);
1268                 } else {
1269 #endif /* INET6 */
1270                         INP_UNLOCK(inp);
1271                         error = ip_ctloutput(so, sopt);
1272 #ifdef INET6
1273                 }
1274 #endif
1275                 return (error);
1276         }
1277         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
1278                 INP_UNLOCK(inp);
1279                 return (ECONNRESET);
1280         }
1281
1282         switch (sopt->sopt_dir) {
1283         case SOPT_SET:
1284                 switch (sopt->sopt_name) {
1285 #ifdef TCP_SIGNATURE
1286                 case TCP_MD5SIG:
1287                         INP_UNLOCK(inp);
1288                         error = sooptcopyin(sopt, &optval, sizeof optval,
1289                             sizeof optval);
1290                         if (error)
1291                                 return (error);
1292
1293                         INP_LOCK_RECHECK(inp);
1294                         if (optval > 0)
1295                                 tp->t_flags |= TF_SIGNATURE;
1296                         else
1297                                 tp->t_flags &= ~TF_SIGNATURE;
1298                         INP_UNLOCK(inp);
1299                         break;
1300 #endif /* TCP_SIGNATURE */
1301                 case TCP_NODELAY:
1302                 case TCP_NOOPT:
1303                         INP_UNLOCK(inp);
1304                         error = sooptcopyin(sopt, &optval, sizeof optval,
1305                             sizeof optval);
1306                         if (error)
1307                                 return (error);
1308
1309                         INP_LOCK_RECHECK(inp);
1310                         switch (sopt->sopt_name) {
1311                         case TCP_NODELAY:
1312                                 opt = TF_NODELAY;
1313                                 break;
1314                         case TCP_NOOPT:
1315                                 opt = TF_NOOPT;
1316                                 break;
1317                         default:
1318                                 opt = 0; /* dead code to fool gcc */
1319                                 break;
1320                         }
1321
1322                         if (optval)
1323                                 tp->t_flags |= opt;
1324                         else
1325                                 tp->t_flags &= ~opt;
1326                         INP_UNLOCK(inp);
1327                         break;
1328
1329                 case TCP_NOPUSH:
1330                         INP_UNLOCK(inp);
1331                         error = sooptcopyin(sopt, &optval, sizeof optval,
1332                             sizeof optval);
1333                         if (error)
1334                                 return (error);
1335
1336                         INP_LOCK_RECHECK(inp);
1337                         if (optval)
1338                                 tp->t_flags |= TF_NOPUSH;
1339                         else {
1340                                 tp->t_flags &= ~TF_NOPUSH;
1341                                 error = tcp_output(tp);
1342                         }
1343                         INP_UNLOCK(inp);
1344                         break;
1345
1346                 case TCP_MAXSEG:
1347                         INP_UNLOCK(inp);
1348                         error = sooptcopyin(sopt, &optval, sizeof optval,
1349                             sizeof optval);
1350                         if (error)
1351                                 return (error);
1352
1353                         INP_LOCK_RECHECK(inp);
1354                         if (optval > 0 && optval <= tp->t_maxseg &&
1355                             optval + 40 >= tcp_minmss)
1356                                 tp->t_maxseg = optval;
1357                         else
1358                                 error = EINVAL;
1359                         INP_UNLOCK(inp);
1360                         break;
1361
1362                 case TCP_INFO:
1363                         INP_UNLOCK(inp);
1364                         error = EINVAL;
1365                         break;
1366
1367                 default:
1368                         INP_UNLOCK(inp);
1369                         error = ENOPROTOOPT;
1370                         break;
1371                 }
1372                 break;
1373
1374         case SOPT_GET:
1375                 tp = intotcpcb(inp);
1376                 switch (sopt->sopt_name) {
1377 #ifdef TCP_SIGNATURE
1378                 case TCP_MD5SIG:
1379                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1380                         INP_UNLOCK(inp);
1381                         error = sooptcopyout(sopt, &optval, sizeof optval);
1382                         break;
1383 #endif
1384
1385                 case TCP_NODELAY:
1386                         optval = tp->t_flags & TF_NODELAY;
1387                         INP_UNLOCK(inp);
1388                         error = sooptcopyout(sopt, &optval, sizeof optval);
1389                         break;
1390                 case TCP_MAXSEG:
1391                         optval = tp->t_maxseg;
1392                         INP_UNLOCK(inp);
1393                         error = sooptcopyout(sopt, &optval, sizeof optval);
1394                         break;
1395                 case TCP_NOOPT:
1396                         optval = tp->t_flags & TF_NOOPT;
1397                         INP_UNLOCK(inp);
1398                         error = sooptcopyout(sopt, &optval, sizeof optval);
1399                         break;
1400                 case TCP_NOPUSH:
1401                         optval = tp->t_flags & TF_NOPUSH;
1402                         INP_UNLOCK(inp);
1403                         error = sooptcopyout(sopt, &optval, sizeof optval);
1404                         break;
1405                 case TCP_INFO:
1406                         tcp_fill_info(tp, &ti);
1407                         INP_UNLOCK(inp);
1408                         error = sooptcopyout(sopt, &ti, sizeof ti);
1409                         break;
1410                 default:
1411                         INP_UNLOCK(inp);
1412                         error = ENOPROTOOPT;
1413                         break;
1414                 }
1415                 break;
1416         }
1417         return (error);
1418 }
1419 #undef INP_LOCK_RECHECK
1420
1421 /*
1422  * tcp_sendspace and tcp_recvspace are the default send and receive window
1423  * sizes, respectively.  These are obsolescent (this information should
1424  * be set by the route).
1425  */
1426 u_long  tcp_sendspace = 1024*32;
1427 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1428     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1429 u_long  tcp_recvspace = 1024*64;
1430 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1431     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1432
1433 /*
1434  * Attach TCP protocol to socket, allocating
1435  * internet protocol control block, tcp control block,
1436  * bufer space, and entering LISTEN state if to accept connections.
1437  */
1438 static int
1439 tcp_attach(struct socket *so)
1440 {
1441         struct tcpcb *tp;
1442         struct inpcb *inp;
1443         int error;
1444 #ifdef INET6
1445         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1446 #endif
1447
1448         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1449                 error = soreserve(so, tcp_sendspace, tcp_recvspace);
1450                 if (error)
1451                         return (error);
1452         }
1453         so->so_rcv.sb_flags |= SB_AUTOSIZE;
1454         so->so_snd.sb_flags |= SB_AUTOSIZE;
1455         INP_INFO_WLOCK(&tcbinfo);
1456         error = in_pcballoc(so, &tcbinfo);
1457         if (error) {
1458                 INP_INFO_WUNLOCK(&tcbinfo);
1459                 return (error);
1460         }
1461         inp = sotoinpcb(so);
1462 #ifdef INET6
1463         if (isipv6) {
1464                 inp->inp_vflag |= INP_IPV6;
1465                 inp->in6p_hops = -1;    /* use kernel default */
1466         }
1467         else
1468 #endif
1469         inp->inp_vflag |= INP_IPV4;
1470         tp = tcp_newtcpcb(inp);
1471         if (tp == NULL) {
1472 #ifdef INET6
1473                 if (isipv6) {
1474                         in6_pcbdetach(inp);
1475                         in6_pcbfree(inp);
1476                 } else {
1477 #endif
1478                         in_pcbdetach(inp);
1479                         in_pcbfree(inp);
1480 #ifdef INET6
1481                 }
1482 #endif
1483                 INP_INFO_WUNLOCK(&tcbinfo);
1484                 return (ENOBUFS);
1485         }
1486         tp->t_state = TCPS_CLOSED;
1487         INP_UNLOCK(inp);
1488         INP_INFO_WUNLOCK(&tcbinfo);
1489         return (0);
1490 }
1491
1492 /*
1493  * Initiate (or continue) disconnect.
1494  * If embryonic state, just send reset (once).
1495  * If in ``let data drain'' option and linger null, just drop.
1496  * Otherwise (hard), mark socket disconnecting and drop
1497  * current input data; switch states based on user close, and
1498  * send segment to peer (with FIN).
1499  */
1500 static void
1501 tcp_disconnect(struct tcpcb *tp)
1502 {
1503         struct inpcb *inp = tp->t_inpcb;
1504         struct socket *so = inp->inp_socket;
1505
1506         INP_INFO_WLOCK_ASSERT(&tcbinfo);
1507         INP_LOCK_ASSERT(inp);
1508
1509         /*
1510          * Neither tcp_close() nor tcp_drop() should return NULL, as the
1511          * socket is still open.
1512          */
1513         if (tp->t_state < TCPS_ESTABLISHED) {
1514                 tp = tcp_close(tp);
1515                 KASSERT(tp != NULL,
1516                     ("tcp_disconnect: tcp_close() returned NULL"));
1517         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1518                 tp = tcp_drop(tp, 0);
1519                 KASSERT(tp != NULL,
1520                     ("tcp_disconnect: tcp_drop() returned NULL"));
1521         } else {
1522                 soisdisconnecting(so);
1523                 sbflush(&so->so_rcv);
1524                 tcp_usrclosed(tp);
1525                 if (!(inp->inp_vflag & INP_DROPPED))
1526                         tcp_output_disconnect(tp);
1527         }
1528 }
1529
1530 /*
1531  * User issued close, and wish to trail through shutdown states:
1532  * if never received SYN, just forget it.  If got a SYN from peer,
1533  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1534  * If already got a FIN from peer, then almost done; go to LAST_ACK
1535  * state.  In all other cases, have already sent FIN to peer (e.g.
1536  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1537  * for peer to send FIN or not respond to keep-alives, etc.
1538  * We can let the user exit from the close as soon as the FIN is acked.
1539  */
1540 static void
1541 tcp_usrclosed(struct tcpcb *tp)
1542 {
1543
1544         INP_INFO_WLOCK_ASSERT(&tcbinfo);
1545         INP_LOCK_ASSERT(tp->t_inpcb);
1546
1547         switch (tp->t_state) {
1548         case TCPS_LISTEN:
1549                 tcp_offload_listen_close(tp);
1550                 /* FALLTHROUGH */
1551         case TCPS_CLOSED:
1552                 tp->t_state = TCPS_CLOSED;
1553                 tp = tcp_close(tp);
1554                 /*
1555                  * tcp_close() should never return NULL here as the socket is
1556                  * still open.
1557                  */
1558                 KASSERT(tp != NULL,
1559                     ("tcp_usrclosed: tcp_close() returned NULL"));
1560                 break;
1561
1562         case TCPS_SYN_SENT:
1563         case TCPS_SYN_RECEIVED:
1564                 tp->t_flags |= TF_NEEDFIN;
1565                 break;
1566
1567         case TCPS_ESTABLISHED:
1568                 tp->t_state = TCPS_FIN_WAIT_1;
1569                 break;
1570
1571         case TCPS_CLOSE_WAIT:
1572                 tp->t_state = TCPS_LAST_ACK;
1573                 break;
1574         }
1575         if (tp->t_state >= TCPS_FIN_WAIT_2) {
1576                 soisdisconnected(tp->t_inpcb->inp_socket);
1577                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1578                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1579                         int timeout;
1580
1581                         timeout = (tcp_fast_finwait2_recycle) ?
1582                             tcp_finwait2_timeout : tcp_maxidle;
1583                         tcp_timer_activate(tp, TT_2MSL, timeout);
1584                 }
1585         }
1586 }
1587
1588 #ifdef DDB
1589 static void
1590 db_print_indent(int indent)
1591 {
1592         int i;
1593
1594         for (i = 0; i < indent; i++)
1595                 db_printf(" ");
1596 }
1597
1598 static void
1599 db_print_tstate(int t_state)
1600 {
1601
1602         switch (t_state) {
1603         case TCPS_CLOSED:
1604                 db_printf("TCPS_CLOSED");
1605                 return;
1606
1607         case TCPS_LISTEN:
1608                 db_printf("TCPS_LISTEN");
1609                 return;
1610
1611         case TCPS_SYN_SENT:
1612                 db_printf("TCPS_SYN_SENT");
1613                 return;
1614
1615         case TCPS_SYN_RECEIVED:
1616                 db_printf("TCPS_SYN_RECEIVED");
1617                 return;
1618
1619         case TCPS_ESTABLISHED:
1620                 db_printf("TCPS_ESTABLISHED");
1621                 return;
1622
1623         case TCPS_CLOSE_WAIT:
1624                 db_printf("TCPS_CLOSE_WAIT");
1625                 return;
1626
1627         case TCPS_FIN_WAIT_1:
1628                 db_printf("TCPS_FIN_WAIT_1");
1629                 return;
1630
1631         case TCPS_CLOSING:
1632                 db_printf("TCPS_CLOSING");
1633                 return;
1634
1635         case TCPS_LAST_ACK:
1636                 db_printf("TCPS_LAST_ACK");
1637                 return;
1638
1639         case TCPS_FIN_WAIT_2:
1640                 db_printf("TCPS_FIN_WAIT_2");
1641                 return;
1642
1643         case TCPS_TIME_WAIT:
1644                 db_printf("TCPS_TIME_WAIT");
1645                 return;
1646
1647         default:
1648                 db_printf("unknown");
1649                 return;
1650         }
1651 }
1652
1653 static void
1654 db_print_tflags(u_int t_flags)
1655 {
1656         int comma;
1657
1658         comma = 0;
1659         if (t_flags & TF_ACKNOW) {
1660                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1661                 comma = 1;
1662         }
1663         if (t_flags & TF_DELACK) {
1664                 db_printf("%sTF_DELACK", comma ? ", " : "");
1665                 comma = 1;
1666         }
1667         if (t_flags & TF_NODELAY) {
1668                 db_printf("%sTF_NODELAY", comma ? ", " : "");
1669                 comma = 1;
1670         }
1671         if (t_flags & TF_NOOPT) {
1672                 db_printf("%sTF_NOOPT", comma ? ", " : "");
1673                 comma = 1;
1674         }
1675         if (t_flags & TF_SENTFIN) {
1676                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1677                 comma = 1;
1678         }
1679         if (t_flags & TF_REQ_SCALE) {
1680                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1681                 comma = 1;
1682         }
1683         if (t_flags & TF_RCVD_SCALE) {
1684                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1685                 comma = 1;
1686         }
1687         if (t_flags & TF_REQ_TSTMP) {
1688                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1689                 comma = 1;
1690         }
1691         if (t_flags & TF_RCVD_TSTMP) {
1692                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1693                 comma = 1;
1694         }
1695         if (t_flags & TF_SACK_PERMIT) {
1696                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1697                 comma = 1;
1698         }
1699         if (t_flags & TF_NEEDSYN) {
1700                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1701                 comma = 1;
1702         }
1703         if (t_flags & TF_NEEDFIN) {
1704                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1705                 comma = 1;
1706         }
1707         if (t_flags & TF_NOPUSH) {
1708                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1709                 comma = 1;
1710         }
1711         if (t_flags & TF_NOPUSH) {
1712                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1713                 comma = 1;
1714         }
1715         if (t_flags & TF_MORETOCOME) {
1716                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1717                 comma = 1;
1718         }
1719         if (t_flags & TF_LQ_OVERFLOW) {
1720                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1721                 comma = 1;
1722         }
1723         if (t_flags & TF_LASTIDLE) {
1724                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1725                 comma = 1;
1726         }
1727         if (t_flags & TF_RXWIN0SENT) {
1728                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1729                 comma = 1;
1730         }
1731         if (t_flags & TF_FASTRECOVERY) {
1732                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1733                 comma = 1;
1734         }
1735         if (t_flags & TF_WASFRECOVERY) {
1736                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1737                 comma = 1;
1738         }
1739         if (t_flags & TF_SIGNATURE) {
1740                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1741                 comma = 1;
1742         }
1743         if (t_flags & TF_FORCEDATA) {
1744                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1745                 comma = 1;
1746         }
1747         if (t_flags & TF_TSO) {
1748                 db_printf("%sTF_TSO", comma ? ", " : "");
1749                 comma = 1;
1750         }
1751 }
1752
1753 static void
1754 db_print_toobflags(char t_oobflags)
1755 {
1756         int comma;
1757
1758         comma = 0;
1759         if (t_oobflags & TCPOOB_HAVEDATA) {
1760                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1761                 comma = 1;
1762         }
1763         if (t_oobflags & TCPOOB_HADDATA) {
1764                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1765                 comma = 1;
1766         }
1767 }
1768
1769 static void
1770 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1771 {
1772
1773         db_print_indent(indent);
1774         db_printf("%s at %p\n", name, tp);
1775
1776         indent += 2;
1777
1778         db_print_indent(indent);
1779         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
1780            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1781
1782         db_print_indent(indent);
1783         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
1784             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1785
1786         db_print_indent(indent);
1787         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1788             &tp->t_timers->tt_delack, tp->t_inpcb);
1789
1790         db_print_indent(indent);
1791         db_printf("t_state: %d (", tp->t_state);
1792         db_print_tstate(tp->t_state);
1793         db_printf(")\n");
1794
1795         db_print_indent(indent);
1796         db_printf("t_flags: 0x%x (", tp->t_flags);
1797         db_print_tflags(tp->t_flags);
1798         db_printf(")\n");
1799
1800         db_print_indent(indent);
1801         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
1802             tp->snd_una, tp->snd_max, tp->snd_nxt);
1803
1804         db_print_indent(indent);
1805         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
1806            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1807
1808         db_print_indent(indent);
1809         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
1810             tp->iss, tp->irs, tp->rcv_nxt);
1811
1812         db_print_indent(indent);
1813         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
1814             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1815
1816         db_print_indent(indent);
1817         db_printf("snd_wnd: %lu   snd_cwnd: %lu   snd_bwnd: %lu\n",
1818            tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
1819
1820         db_print_indent(indent);
1821         db_printf("snd_ssthresh: %lu   snd_bandwidth: %lu   snd_recover: "
1822             "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
1823             tp->snd_recover);
1824
1825         db_print_indent(indent);
1826         db_printf("t_maxopd: %u   t_rcvtime: %lu   t_startime: %lu\n",
1827             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1828
1829         db_print_indent(indent);
1830         db_printf("t_rttime: %d   t_rtsq: 0x%08x   t_bw_rtttime: %d\n",
1831             tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
1832
1833         db_print_indent(indent);
1834         db_printf("t_bw_rtseq: 0x%08x   t_rxtcur: %d   t_maxseg: %u   "
1835             "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
1836             tp->t_srtt);
1837
1838         db_print_indent(indent);
1839         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
1840             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
1841             tp->t_rttbest);
1842
1843         db_print_indent(indent);
1844         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
1845             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
1846
1847         db_print_indent(indent);
1848         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
1849         db_print_toobflags(tp->t_oobflags);
1850         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
1851
1852         db_print_indent(indent);
1853         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
1854             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
1855
1856         db_print_indent(indent);
1857         db_printf("ts_recent: %u   ts_recent_age: %lu\n",
1858             tp->ts_recent, tp->ts_recent_age);
1859
1860         db_print_indent(indent);
1861         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
1862             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
1863
1864         db_print_indent(indent);
1865         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
1866             "t_badrxtwin: %lu\n", tp->snd_ssthresh_prev,
1867             tp->snd_recover_prev, tp->t_badrxtwin);
1868
1869         db_print_indent(indent);
1870         db_printf("snd_numholes: %d  snd_holes first: %p\n",
1871             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
1872
1873         db_print_indent(indent);
1874         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
1875             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
1876
1877         /* Skip sackblks, sackhint. */
1878
1879         db_print_indent(indent);
1880         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
1881             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
1882 }
1883
1884 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
1885 {
1886         struct tcpcb *tp;
1887
1888         if (!have_addr) {
1889                 db_printf("usage: show tcpcb <addr>\n");
1890                 return;
1891         }
1892         tp = (struct tcpcb *)addr;
1893
1894         db_print_tcpcb(tp, "tcpcb", 0);
1895 }
1896 #endif