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 #include <sys/vimage.h>
  57
  58 #ifdef DDB
  59 #include <ddb/ddb.h>
  60 #endif
  61
  62 #include <net/if.h>
  63 #include <net/route.h>
  64
  65 #include <netinet/in.h>
  66 #include <netinet/in_systm.h>
  67 #ifdef INET6
  68 #include <netinet/ip6.h>
  69 #endif
  70 #include <netinet/in_pcb.h>
  71 #ifdef INET6
  72 #include <netinet6/in6_pcb.h>
  73 #endif
  74 #include <netinet/in_var.h>
  75 #include <netinet/ip_var.h>
  76 #ifdef INET6
  77 #include <netinet6/ip6_var.h>
  78 #include <netinet6/scope6_var.h>
  79 #endif
  80 #include <netinet/tcp.h>
  81 #include <netinet/tcp_fsm.h>
  82 #include <netinet/tcp_seq.h>
  83 #include <netinet/tcp_timer.h>
  84 #include <netinet/tcp_var.h>
  85 #include <netinet/tcpip.h>
  86 #ifdef TCPDEBUG
  87 #include <netinet/tcp_debug.h>
  88 #endif
  89 #include <netinet/tcp_offload.h>
  90
  91 /*
  92  * TCP protocol interface to socket abstraction.
  93  */
  94 static int      tcp_attach(struct socket *);
  95 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
  96                     struct thread *td);
  97 #ifdef INET6
  98 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
  99                     struct thread *td);
 100 #endif /* INET6 */
 101 static void     tcp_disconnect(struct tcpcb *);
 102 static void     tcp_usrclosed(struct tcpcb *);
 103 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 104
 105 #ifdef TCPDEBUG
 106 #define TCPDEBUG0       int ostate = 0
 107 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 108 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 109                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 110 #else
 111 #define TCPDEBUG0
 112 #define TCPDEBUG1()
 113 #define TCPDEBUG2(req)
 114 #endif
 115
 116 /*
 117  * TCP attaches to socket via pru_attach(), reserving space,
 118  * and an internet control block.
 119  */
 120 static int
 121 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 122 {
 123         struct inpcb *inp;
 124         struct tcpcb *tp = NULL;
 125         int error;
 126         TCPDEBUG0;
 127
 128         inp = sotoinpcb(so);
 129         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 130         TCPDEBUG1();
 131
 132         error = tcp_attach(so);
 133         if (error)
 134                 goto out;
 135
 136         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 137                 so->so_linger = TCP_LINGERTIME;
 138
 139         inp = sotoinpcb(so);
 140         tp = intotcpcb(inp);
 141 out:
 142         TCPDEBUG2(PRU_ATTACH);
 143         return error;
 144 }
 145
 146 /*
 147  * tcp_detach is called when the socket layer loses its final reference
 148  * to the socket, be it a file descriptor reference, a reference from TCP,
 149  * etc.  At this point, there is only one case in which we will keep around
 150  * inpcb state: time wait.
 151  *
 152  * This function can probably be re-absorbed back into tcp_usr_detach() now
 153  * that there is a single detach path.
 154  */
 155 static void
 156 tcp_detach(struct socket *so, struct inpcb *inp)
 157 {
 158         struct tcpcb *tp;
 159 #ifdef INET6
 160         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
 161 #endif
 162
 163         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 164         INP_WLOCK_ASSERT(inp);
 165
 166         KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
 167         KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
 168
 169         tp = intotcpcb(inp);
 170
 171         if (inp->inp_vflag & INP_TIMEWAIT) {
 172                 /*
 173                  * There are two cases to handle: one in which the time wait
 174                  * state is being discarded (INP_DROPPED), and one in which
 175                  * this connection will remain in timewait.  In the former,
 176                  * it is time to discard all state (except tcptw, which has
 177                  * already been discarded by the timewait close code, which
 178                  * should be further up the call stack somewhere).  In the
 179                  * latter case, we detach from the socket, but leave the pcb
 180                  * present until timewait ends.
 181                  *
 182                  * XXXRW: Would it be cleaner to free the tcptw here?
 183                  */
 184                 if (inp->inp_vflag & INP_DROPPED) {
 185                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 186                             "INP_DROPPED && tp != NULL"));
 187 #ifdef INET6
 188                         if (isipv6) {
 189                                 in6_pcbdetach(inp);
 190                                 in6_pcbfree(inp);
 191                         } else {
 192 #endif
 193                                 in_pcbdetach(inp);
 194                                 in_pcbfree(inp);
 195 #ifdef INET6
 196                         }
 197 #endif
 198                 } else {
 199 #ifdef INET6
 200                         if (isipv6)
 201                                 in6_pcbdetach(inp);
 202                         else
 203 #endif
 204                                 in_pcbdetach(inp);
 205                         INP_WUNLOCK(inp);
 206                 }
 207         } else {
 208                 /*
 209                  * If the connection is not in timewait, we consider two
 210                  * two conditions: one in which no further processing is
 211                  * necessary (dropped || embryonic), and one in which TCP is
 212                  * not yet done, but no longer requires the socket, so the
 213                  * pcb will persist for the time being.
 214                  *
 215                  * XXXRW: Does the second case still occur?
 216                  */
 217                 if (inp->inp_vflag & INP_DROPPED ||
 218                     tp->t_state < TCPS_SYN_SENT) {
 219                         tcp_discardcb(tp);
 220 #ifdef INET6
 221                         if (isipv6) {
 222                                 in6_pcbdetach(inp);
 223                                 in6_pcbfree(inp);
 224                         } else {
 225 #endif
 226                                 in_pcbdetach(inp);
 227                                 in_pcbfree(inp);
 228 #ifdef INET6
 229                         }
 230 #endif
 231                 } else {
 232 #ifdef INET6
 233                         if (isipv6)
 234                                 in6_pcbdetach(inp);
 235                         else
 236 #endif
 237                                 in_pcbdetach(inp);
 238                 }
 239         }
 240 }
 241
 242 /*
 243  * pru_detach() detaches the TCP protocol from the socket.
 244  * If the protocol state is non-embryonic, then can't
 245  * do this directly: have to initiate a pru_disconnect(),
 246  * which may finish later; embryonic TCB's can just
 247  * be discarded here.
 248  */
 249 static void
 250 tcp_usr_detach(struct socket *so)
 251 {
 252         struct inpcb *inp;
 253
 254         inp = sotoinpcb(so);
 255         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
 256         INP_INFO_WLOCK(&V_tcbinfo);
 257         INP_WLOCK(inp);
 258         KASSERT(inp->inp_socket != NULL,
 259             ("tcp_usr_detach: inp_socket == NULL"));
 260         tcp_detach(so, inp);
 261         INP_INFO_WUNLOCK(&V_tcbinfo);
 262 }
 263
 264 /*
 265  * Give the socket an address.
 266  */
 267 static int
 268 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 269 {
 270         int error = 0;
 271         struct inpcb *inp;
 272         struct tcpcb *tp = NULL;
 273         struct sockaddr_in *sinp;
 274
 275         sinp = (struct sockaddr_in *)nam;
 276         if (nam->sa_len != sizeof (*sinp))
 277                 return (EINVAL);
 278         /*
 279          * Must check for multicast addresses and disallow binding
 280          * to them.
 281          */
 282         if (sinp->sin_family == AF_INET &&
 283             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 284                 return (EAFNOSUPPORT);
 285
 286         TCPDEBUG0;
 287         INP_INFO_WLOCK(&V_tcbinfo);
 288         inp = sotoinpcb(so);
 289         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 290         INP_WLOCK(inp);
 291         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 292                 error = EINVAL;
 293                 goto out;
 294         }
 295         tp = intotcpcb(inp);
 296         TCPDEBUG1();
 297         error = in_pcbbind(inp, nam, td->td_ucred);
 298 out:
 299         TCPDEBUG2(PRU_BIND);
 300         INP_WUNLOCK(inp);
 301         INP_INFO_WUNLOCK(&V_tcbinfo);
 302
 303         return (error);
 304 }
 305
 306 #ifdef INET6
 307 static int
 308 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 309 {
 310         int error = 0;
 311         struct inpcb *inp;
 312         struct tcpcb *tp = NULL;
 313         struct sockaddr_in6 *sin6p;
 314
 315         sin6p = (struct sockaddr_in6 *)nam;
 316         if (nam->sa_len != sizeof (*sin6p))
 317                 return (EINVAL);
 318         /*
 319          * Must check for multicast addresses and disallow binding
 320          * to them.
 321          */
 322         if (sin6p->sin6_family == AF_INET6 &&
 323             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 324                 return (EAFNOSUPPORT);
 325
 326         TCPDEBUG0;
 327         INP_INFO_WLOCK(&V_tcbinfo);
 328         inp = sotoinpcb(so);
 329         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 330         INP_WLOCK(inp);
 331         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 332                 error = EINVAL;
 333                 goto out;
 334         }
 335         tp = intotcpcb(inp);
 336         TCPDEBUG1();
 337         inp->inp_vflag &= ~INP_IPV4;
 338         inp->inp_vflag |= INP_IPV6;
 339         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 340                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 341                         inp->inp_vflag |= INP_IPV4;
 342                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 343                         struct sockaddr_in sin;
 344
 345                         in6_sin6_2_sin(&sin, sin6p);
 346                         inp->inp_vflag |= INP_IPV4;
 347                         inp->inp_vflag &= ~INP_IPV6;
 348                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 349                             td->td_ucred);
 350                         goto out;
 351                 }
 352         }
 353         error = in6_pcbbind(inp, nam, td->td_ucred);
 354 out:
 355         TCPDEBUG2(PRU_BIND);
 356         INP_WUNLOCK(inp);
 357         INP_INFO_WUNLOCK(&V_tcbinfo);
 358         return (error);
 359 }
 360 #endif /* INET6 */
 361
 362 /*
 363  * Prepare to accept connections.
 364  */
 365 static int
 366 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 367 {
 368         int error = 0;
 369         struct inpcb *inp;
 370         struct tcpcb *tp = NULL;
 371
 372         TCPDEBUG0;
 373         INP_INFO_WLOCK(&V_tcbinfo);
 374         inp = sotoinpcb(so);
 375         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 376         INP_WLOCK(inp);
 377         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 378                 error = EINVAL;
 379                 goto out;
 380         }
 381         tp = intotcpcb(inp);
 382         TCPDEBUG1();
 383         SOCK_LOCK(so);
 384         error = solisten_proto_check(so);
 385         if (error == 0 && inp->inp_lport == 0)
 386                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 387         if (error == 0) {
 388                 tp->t_state = TCPS_LISTEN;
 389                 solisten_proto(so, backlog);
 390                 tcp_offload_listen_open(tp);
 391         }
 392         SOCK_UNLOCK(so);
 393
 394 out:
 395         TCPDEBUG2(PRU_LISTEN);
 396         INP_WUNLOCK(inp);
 397         INP_INFO_WUNLOCK(&V_tcbinfo);
 398         return (error);
 399 }
 400
 401 #ifdef INET6
 402 static int
 403 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 404 {
 405         int error = 0;
 406         struct inpcb *inp;
 407         struct tcpcb *tp = NULL;
 408
 409         TCPDEBUG0;
 410         INP_INFO_WLOCK(&V_tcbinfo);
 411         inp = sotoinpcb(so);
 412         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 413         INP_WLOCK(inp);
 414         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 415                 error = EINVAL;
 416                 goto out;
 417         }
 418         tp = intotcpcb(inp);
 419         TCPDEBUG1();
 420         SOCK_LOCK(so);
 421         error = solisten_proto_check(so);
 422         if (error == 0 && inp->inp_lport == 0) {
 423                 inp->inp_vflag &= ~INP_IPV4;
 424                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 425                         inp->inp_vflag |= INP_IPV4;
 426                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 427         }
 428         if (error == 0) {
 429                 tp->t_state = TCPS_LISTEN;
 430                 solisten_proto(so, backlog);
 431         }
 432         SOCK_UNLOCK(so);
 433
 434 out:
 435         TCPDEBUG2(PRU_LISTEN);
 436         INP_WUNLOCK(inp);
 437         INP_INFO_WUNLOCK(&V_tcbinfo);
 438         return (error);
 439 }
 440 #endif /* INET6 */
 441
 442 /*
 443  * Initiate connection to peer.
 444  * Create a template for use in transmissions on this connection.
 445  * Enter SYN_SENT state, and mark socket as connecting.
 446  * Start keep-alive timer, and seed output sequence space.
 447  * Send initial segment on connection.
 448  */
 449 static int
 450 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 451 {
 452         int error = 0;
 453         struct inpcb *inp;
 454         struct tcpcb *tp = NULL;
 455         struct sockaddr_in *sinp;
 456
 457         sinp = (struct sockaddr_in *)nam;
 458         if (nam->sa_len != sizeof (*sinp))
 459                 return (EINVAL);
 460         /*
 461          * Must disallow TCP ``connections'' to multicast addresses.
 462          */
 463         if (sinp->sin_family == AF_INET
 464             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 465                 return (EAFNOSUPPORT);
 466         if (jailed(td->td_ucred))
 467                 prison_remote_ip(td->td_ucred, 0, &sinp->sin_addr.s_addr);
 468
 469         TCPDEBUG0;
 470         INP_INFO_WLOCK(&V_tcbinfo);
 471         inp = sotoinpcb(so);
 472         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 473         INP_WLOCK(inp);
 474         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 475                 error = EINVAL;
 476                 goto out;
 477         }
 478         tp = intotcpcb(inp);
 479         TCPDEBUG1();
 480         if ((error = tcp_connect(tp, nam, td)) != 0)
 481                 goto out;
 482         error = tcp_output_connect(so, nam);
 483 out:
 484         TCPDEBUG2(PRU_CONNECT);
 485         INP_WUNLOCK(inp);
 486         INP_INFO_WUNLOCK(&V_tcbinfo);
 487         return (error);
 488 }
 489
 490 #ifdef INET6
 491 static int
 492 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 493 {
 494         int error = 0;
 495         struct inpcb *inp;
 496         struct tcpcb *tp = NULL;
 497         struct sockaddr_in6 *sin6p;
 498
 499         TCPDEBUG0;
 500
 501         sin6p = (struct sockaddr_in6 *)nam;
 502         if (nam->sa_len != sizeof (*sin6p))
 503                 return (EINVAL);
 504         /*
 505          * Must disallow TCP ``connections'' to multicast addresses.
 506          */
 507         if (sin6p->sin6_family == AF_INET6
 508             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 509                 return (EAFNOSUPPORT);
 510
 511         INP_INFO_WLOCK(&V_tcbinfo);
 512         inp = sotoinpcb(so);
 513         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 514         INP_WLOCK(inp);
 515         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 516                 error = EINVAL;
 517                 goto out;
 518         }
 519         tp = intotcpcb(inp);
 520         TCPDEBUG1();
 521         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 522                 struct sockaddr_in sin;
 523
 524                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 525                         error = EINVAL;
 526                         goto out;
 527                 }
 528
 529                 in6_sin6_2_sin(&sin, sin6p);
 530                 inp->inp_vflag |= INP_IPV4;
 531                 inp->inp_vflag &= ~INP_IPV6;
 532                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 533                         goto out;
 534                 error = tcp_output_connect(so, nam);
 535                 goto out;
 536         }
 537         inp->inp_vflag &= ~INP_IPV4;
 538         inp->inp_vflag |= INP_IPV6;
 539         inp->inp_inc.inc_isipv6 = 1;
 540         if ((error = tcp6_connect(tp, nam, td)) != 0)
 541                 goto out;
 542         error = tcp_output_connect(so, nam);
 543
 544 out:
 545         TCPDEBUG2(PRU_CONNECT);
 546         INP_WUNLOCK(inp);
 547         INP_INFO_WUNLOCK(&V_tcbinfo);
 548         return (error);
 549 }
 550 #endif /* INET6 */
 551
 552 /*
 553  * Initiate disconnect from peer.
 554  * If connection never passed embryonic stage, just drop;
 555  * else if don't need to let data drain, then can just drop anyways,
 556  * else have to begin TCP shutdown process: mark socket disconnecting,
 557  * drain unread data, state switch to reflect user close, and
 558  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 559  * when peer sends FIN and acks ours.
 560  *
 561  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 562  */
 563 static int
 564 tcp_usr_disconnect(struct socket *so)
 565 {
 566         struct inpcb *inp;
 567         struct tcpcb *tp = NULL;
 568         int error = 0;
 569
 570         TCPDEBUG0;
 571         INP_INFO_WLOCK(&V_tcbinfo);
 572         inp = sotoinpcb(so);
 573         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 574         INP_WLOCK(inp);
 575         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 576                 error = ECONNRESET;
 577                 goto out;
 578         }
 579         tp = intotcpcb(inp);
 580         TCPDEBUG1();
 581         tcp_disconnect(tp);
 582 out:
 583         TCPDEBUG2(PRU_DISCONNECT);
 584         INP_WUNLOCK(inp);
 585         INP_INFO_WUNLOCK(&V_tcbinfo);
 586         return (error);
 587 }
 588
 589 /*
 590  * Accept a connection.  Essentially all the work is
 591  * done at higher levels; just return the address
 592  * of the peer, storing through addr.
 593  */
 594 static int
 595 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 596 {
 597         int error = 0;
 598         struct inpcb *inp = NULL;
 599         struct tcpcb *tp = NULL;
 600         struct in_addr addr;
 601         in_port_t port = 0;
 602         TCPDEBUG0;
 603
 604         if (so->so_state & SS_ISDISCONNECTED)
 605                 return (ECONNABORTED);
 606
 607         inp = sotoinpcb(so);
 608         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 609         INP_INFO_RLOCK(&V_tcbinfo);
 610         INP_WLOCK(inp);
 611         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 612                 error = ECONNABORTED;
 613                 goto out;
 614         }
 615         tp = intotcpcb(inp);
 616         TCPDEBUG1();
 617
 618         /*
 619          * We inline in_getpeeraddr and COMMON_END here, so that we can
 620          * copy the data of interest and defer the malloc until after we
 621          * release the lock.
 622          */
 623         port = inp->inp_fport;
 624         addr = inp->inp_faddr;
 625
 626 out:
 627         TCPDEBUG2(PRU_ACCEPT);
 628         INP_WUNLOCK(inp);
 629         INP_INFO_RUNLOCK(&V_tcbinfo);
 630         if (error == 0)
 631                 *nam = in_sockaddr(port, &addr);
 632         return error;
 633 }
 634
 635 #ifdef INET6
 636 static int
 637 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 638 {
 639         struct inpcb *inp = NULL;
 640         int error = 0;
 641         struct tcpcb *tp = NULL;
 642         struct in_addr addr;
 643         struct in6_addr addr6;
 644         in_port_t port = 0;
 645         int v4 = 0;
 646         TCPDEBUG0;
 647
 648         if (so->so_state & SS_ISDISCONNECTED)
 649                 return (ECONNABORTED);
 650
 651         inp = sotoinpcb(so);
 652         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 653         INP_WLOCK(inp);
 654         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 655                 error = ECONNABORTED;
 656                 goto out;
 657         }
 658         tp = intotcpcb(inp);
 659         TCPDEBUG1();
 660
 661         /*
 662          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 663          * copy the data of interest and defer the malloc until after we
 664          * release the lock.
 665          */
 666         if (inp->inp_vflag & INP_IPV4) {
 667                 v4 = 1;
 668                 port = inp->inp_fport;
 669                 addr = inp->inp_faddr;
 670         } else {
 671                 port = inp->inp_fport;
 672                 addr6 = inp->in6p_faddr;
 673         }
 674
 675 out:
 676         TCPDEBUG2(PRU_ACCEPT);
 677         INP_WUNLOCK(inp);
 678         if (error == 0) {
 679                 if (v4)
 680                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 681                 else
 682                         *nam = in6_sockaddr(port, &addr6);
 683         }
 684         return error;
 685 }
 686 #endif /* INET6 */
 687
 688 /*
 689  * Mark the connection as being incapable of further output.
 690  */
 691 static int
 692 tcp_usr_shutdown(struct socket *so)
 693 {
 694         int error = 0;
 695         struct inpcb *inp;
 696         struct tcpcb *tp = NULL;
 697
 698         TCPDEBUG0;
 699         INP_INFO_WLOCK(&V_tcbinfo);
 700         inp = sotoinpcb(so);
 701         KASSERT(inp != NULL, ("inp == NULL"));
 702         INP_WLOCK(inp);
 703         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 704                 error = ECONNRESET;
 705                 goto out;
 706         }
 707         tp = intotcpcb(inp);
 708         TCPDEBUG1();
 709         socantsendmore(so);
 710         tcp_usrclosed(tp);
 711         error = tcp_output_disconnect(tp);
 712
 713 out:
 714         TCPDEBUG2(PRU_SHUTDOWN);
 715         INP_WUNLOCK(inp);
 716         INP_INFO_WUNLOCK(&V_tcbinfo);
 717
 718         return (error);
 719 }
 720
 721 /*
 722  * After a receive, possibly send window update to peer.
 723  */
 724 static int
 725 tcp_usr_rcvd(struct socket *so, int flags)
 726 {
 727         struct inpcb *inp;
 728         struct tcpcb *tp = NULL;
 729         int error = 0;
 730
 731         TCPDEBUG0;
 732         inp = sotoinpcb(so);
 733         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 734         INP_WLOCK(inp);
 735         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 736                 error = ECONNRESET;
 737                 goto out;
 738         }
 739         tp = intotcpcb(inp);
 740         TCPDEBUG1();
 741         tcp_output_rcvd(tp);
 742
 743 out:
 744         TCPDEBUG2(PRU_RCVD);
 745         INP_WUNLOCK(inp);
 746         return (error);
 747 }
 748
 749 /*
 750  * Do a send by putting data in output queue and updating urgent
 751  * marker if URG set.  Possibly send more data.  Unlike the other
 752  * pru_*() routines, the mbuf chains are our responsibility.  We
 753  * must either enqueue them or free them.  The other pru_* routines
 754  * generally are caller-frees.
 755  */
 756 static int
 757 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 758     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 759 {
 760         int error = 0;
 761         struct inpcb *inp;
 762         struct tcpcb *tp = NULL;
 763         int headlocked = 0;
 764 #ifdef INET6
 765         int isipv6;
 766 #endif
 767         TCPDEBUG0;
 768
 769         /*
 770          * We require the pcbinfo lock in two cases:
 771          *
 772          * (1) An implied connect is taking place, which can result in
 773          *     binding IPs and ports and hence modification of the pcb hash
 774          *     chains.
 775          *
 776          * (2) PRUS_EOF is set, resulting in explicit close on the send.
 777          */
 778         if ((nam != NULL) || (flags & PRUS_EOF)) {
 779                 INP_INFO_WLOCK(&V_tcbinfo);
 780                 headlocked = 1;
 781         }
 782         inp = sotoinpcb(so);
 783         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 784         INP_WLOCK(inp);
 785         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
 786                 if (control)
 787                         m_freem(control);
 788                 if (m)
 789                         m_freem(m);
 790                 error = ECONNRESET;
 791                 goto out;
 792         }
 793 #ifdef INET6
 794         isipv6 = nam && nam->sa_family == AF_INET6;
 795 #endif /* INET6 */
 796         tp = intotcpcb(inp);
 797         TCPDEBUG1();
 798         if (control) {
 799                 /* TCP doesn't do control messages (rights, creds, etc) */
 800                 if (control->m_len) {
 801                         m_freem(control);
 802                         if (m)
 803                                 m_freem(m);
 804                         error = EINVAL;
 805                         goto out;
 806                 }
 807                 m_freem(control);       /* empty control, just free it */
 808         }
 809         if (!(flags & PRUS_OOB)) {
 810                 sbappendstream(&so->so_snd, m);
 811                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 812                         /*
 813                          * Do implied connect if not yet connected,
 814                          * initialize window to default value, and
 815                          * initialize maxseg/maxopd using peer's cached
 816                          * MSS.
 817                          */
 818                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 819 #ifdef INET6
 820                         if (isipv6)
 821                                 error = tcp6_connect(tp, nam, td);
 822                         else
 823 #endif /* INET6 */
 824                         error = tcp_connect(tp, nam, td);
 825                         if (error)
 826                                 goto out;
 827                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 828                         tcp_mss(tp, -1);
 829                 }
 830                 if (flags & PRUS_EOF) {
 831                         /*
 832                          * Close the send side of the connection after
 833                          * the data is sent.
 834                          */
 835                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 836                         socantsendmore(so);
 837                         tcp_usrclosed(tp);
 838                 }
 839                 if (headlocked) {
 840                         INP_INFO_WUNLOCK(&V_tcbinfo);
 841                         headlocked = 0;
 842                 }
 843                 if (tp != NULL) {
 844                         if (flags & PRUS_MORETOCOME)
 845                                 tp->t_flags |= TF_MORETOCOME;
 846                         error = tcp_output_send(tp);
 847                         if (flags & PRUS_MORETOCOME)
 848                                 tp->t_flags &= ~TF_MORETOCOME;
 849                 }
 850         } else {
 851                 /*
 852                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 853                  */
 854                 SOCKBUF_LOCK(&so->so_snd);
 855                 if (sbspace(&so->so_snd) < -512) {
 856                         SOCKBUF_UNLOCK(&so->so_snd);
 857                         m_freem(m);
 858                         error = ENOBUFS;
 859                         goto out;
 860                 }
 861                 /*
 862                  * According to RFC961 (Assigned Protocols),
 863                  * the urgent pointer points to the last octet
 864                  * of urgent data.  We continue, however,
 865                  * to consider it to indicate the first octet
 866                  * of data past the urgent section.
 867                  * Otherwise, snd_up should be one lower.
 868                  */
 869                 sbappendstream_locked(&so->so_snd, m);
 870                 SOCKBUF_UNLOCK(&so->so_snd);
 871                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 872                         /*
 873                          * Do implied connect if not yet connected,
 874                          * initialize window to default value, and
 875                          * initialize maxseg/maxopd using peer's cached
 876                          * MSS.
 877                          */
 878                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 879 #ifdef INET6
 880                         if (isipv6)
 881                                 error = tcp6_connect(tp, nam, td);
 882                         else
 883 #endif /* INET6 */
 884                         error = tcp_connect(tp, nam, td);
 885                         if (error)
 886                                 goto out;
 887                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 888                         tcp_mss(tp, -1);
 889                         INP_INFO_WUNLOCK(&V_tcbinfo);
 890                         headlocked = 0;
 891                 } else if (nam) {
 892                         INP_INFO_WUNLOCK(&V_tcbinfo);
 893                         headlocked = 0;
 894                 }
 895                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 896                 tp->t_flags |= TF_FORCEDATA;
 897                 error = tcp_output_send(tp);
 898                 tp->t_flags &= ~TF_FORCEDATA;
 899         }
 900 out:
 901         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
 902                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 903         INP_WUNLOCK(inp);
 904         if (headlocked)
 905                 INP_INFO_WUNLOCK(&V_tcbinfo);
 906         return (error);
 907 }
 908
 909 /*
 910  * Abort the TCP.  Drop the connection abruptly.
 911  */
 912 static void
 913 tcp_usr_abort(struct socket *so)
 914 {
 915         struct inpcb *inp;
 916         struct tcpcb *tp = NULL;
 917         TCPDEBUG0;
 918
 919         inp = sotoinpcb(so);
 920         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
 921
 922         INP_INFO_WLOCK(&V_tcbinfo);
 923         INP_WLOCK(inp);
 924         KASSERT(inp->inp_socket != NULL,
 925             ("tcp_usr_abort: inp_socket == NULL"));
 926
 927         /*
 928          * If we still have full TCP state, and we're not dropped, drop.
 929          */
 930         if (!(inp->inp_vflag & INP_TIMEWAIT) &&
 931             !(inp->inp_vflag & INP_DROPPED)) {
 932                 tp = intotcpcb(inp);
 933                 TCPDEBUG1();
 934                 tcp_drop(tp, ECONNABORTED);
 935                 TCPDEBUG2(PRU_ABORT);
 936         }
 937         if (!(inp->inp_vflag & INP_DROPPED)) {
 938                 SOCK_LOCK(so);
 939                 so->so_state |= SS_PROTOREF;
 940                 SOCK_UNLOCK(so);
 941                 inp->inp_vflag |= INP_SOCKREF;
 942         }
 943         INP_WUNLOCK(inp);
 944         INP_INFO_WUNLOCK(&V_tcbinfo);
 945 }
 946
 947 /*
 948  * TCP socket is closed.  Start friendly disconnect.
 949  */
 950 static void
 951 tcp_usr_close(struct socket *so)
 952 {
 953         struct inpcb *inp;
 954         struct tcpcb *tp = NULL;
 955         TCPDEBUG0;
 956
 957         inp = sotoinpcb(so);
 958         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
 959
 960         INP_INFO_WLOCK(&V_tcbinfo);
 961         INP_WLOCK(inp);
 962         KASSERT(inp->inp_socket != NULL,
 963             ("tcp_usr_close: inp_socket == NULL"));
 964
 965         /*
 966          * If we still have full TCP state, and we're not dropped, initiate
 967          * a disconnect.
 968          */
 969         if (!(inp->inp_vflag & INP_TIMEWAIT) &&
 970             !(inp->inp_vflag & INP_DROPPED)) {
 971                 tp = intotcpcb(inp);
 972                 TCPDEBUG1();
 973                 tcp_disconnect(tp);
 974                 TCPDEBUG2(PRU_CLOSE);
 975         }
 976         if (!(inp->inp_vflag & INP_DROPPED)) {
 977                 SOCK_LOCK(so);
 978                 so->so_state |= SS_PROTOREF;
 979                 SOCK_UNLOCK(so);
 980                 inp->inp_vflag |= INP_SOCKREF;
 981         }
 982         INP_WUNLOCK(inp);
 983         INP_INFO_WUNLOCK(&V_tcbinfo);
 984 }
 985
 986 /*
 987  * Receive out-of-band data.
 988  */
 989 static int
 990 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
 991 {
 992         int error = 0;
 993         struct inpcb *inp;
 994         struct tcpcb *tp = NULL;
 995
 996         TCPDEBUG0;
 997         inp = sotoinpcb(so);
 998         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
 999         INP_WLOCK(inp);
1000         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
1001                 error = ECONNRESET;
1002                 goto out;
1003         }
1004         tp = intotcpcb(inp);
1005         TCPDEBUG1();
1006         if ((so->so_oobmark == 0 &&
1007              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1008             so->so_options & SO_OOBINLINE ||
1009             tp->t_oobflags & TCPOOB_HADDATA) {
1010                 error = EINVAL;
1011                 goto out;
1012         }
1013         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1014                 error = EWOULDBLOCK;
1015                 goto out;
1016         }
1017         m->m_len = 1;
1018         *mtod(m, caddr_t) = tp->t_iobc;
1019         if ((flags & MSG_PEEK) == 0)
1020                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1021
1022 out:
1023         TCPDEBUG2(PRU_RCVOOB);
1024         INP_WUNLOCK(inp);
1025         return (error);
1026 }
1027
1028 struct pr_usrreqs tcp_usrreqs = {
1029         .pru_abort =            tcp_usr_abort,
1030         .pru_accept =           tcp_usr_accept,
1031         .pru_attach =           tcp_usr_attach,
1032         .pru_bind =             tcp_usr_bind,
1033         .pru_connect =          tcp_usr_connect,
1034         .pru_control =          in_control,
1035         .pru_detach =           tcp_usr_detach,
1036         .pru_disconnect =       tcp_usr_disconnect,
1037         .pru_listen =           tcp_usr_listen,
1038         .pru_peeraddr =         in_getpeeraddr,
1039         .pru_rcvd =             tcp_usr_rcvd,
1040         .pru_rcvoob =           tcp_usr_rcvoob,
1041         .pru_send =             tcp_usr_send,
1042         .pru_shutdown =         tcp_usr_shutdown,
1043         .pru_sockaddr =         in_getsockaddr,
1044         .pru_sosetlabel =       in_pcbsosetlabel,
1045         .pru_close =            tcp_usr_close,
1046 };
1047
1048 #ifdef INET6
1049 struct pr_usrreqs tcp6_usrreqs = {
1050         .pru_abort =            tcp_usr_abort,
1051         .pru_accept =           tcp6_usr_accept,
1052         .pru_attach =           tcp_usr_attach,
1053         .pru_bind =             tcp6_usr_bind,
1054         .pru_connect =          tcp6_usr_connect,
1055         .pru_control =          in6_control,
1056         .pru_detach =           tcp_usr_detach,
1057         .pru_disconnect =       tcp_usr_disconnect,
1058         .pru_listen =           tcp6_usr_listen,
1059         .pru_peeraddr =         in6_mapped_peeraddr,
1060         .pru_rcvd =             tcp_usr_rcvd,
1061         .pru_rcvoob =           tcp_usr_rcvoob,
1062         .pru_send =             tcp_usr_send,
1063         .pru_shutdown =         tcp_usr_shutdown,
1064         .pru_sockaddr =         in6_mapped_sockaddr,
1065         .pru_sosetlabel =       in_pcbsosetlabel,
1066         .pru_close =            tcp_usr_close,
1067 };
1068 #endif /* INET6 */
1069
1070 /*
1071  * Common subroutine to open a TCP connection to remote host specified
1072  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1073  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1074  * to choose a local host address (interface).  If there is an existing
1075  * incarnation of the same connection in TIME-WAIT state and if the remote
1076  * host was sending CC options and if the connection duration was < MSL, then
1077  * truncate the previous TIME-WAIT state and proceed.
1078  * Initialize connection parameters and enter SYN-SENT state.
1079  */
1080 static int
1081 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1082 {
1083         struct inpcb *inp = tp->t_inpcb, *oinp;
1084         struct socket *so = inp->inp_socket;
1085         struct in_addr laddr;
1086         u_short lport;
1087         int error;
1088
1089         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1090         INP_WLOCK_ASSERT(inp);
1091
1092         if (inp->inp_lport == 0) {
1093                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1094                 if (error)
1095                         return error;
1096         }
1097
1098         /*
1099          * Cannot simply call in_pcbconnect, because there might be an
1100          * earlier incarnation of this same connection still in
1101          * TIME_WAIT state, creating an ADDRINUSE error.
1102          */
1103         laddr = inp->inp_laddr;
1104         lport = inp->inp_lport;
1105         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1106             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1107         if (error && oinp == NULL)
1108                 return error;
1109         if (oinp)
1110                 return EADDRINUSE;
1111         inp->inp_laddr = laddr;
1112         in_pcbrehash(inp);
1113
1114         /*
1115          * Compute window scaling to request:
1116          * Scale to fit into sweet spot.  See tcp_syncache.c.
1117          * XXX: This should move to tcp_output().
1118          */
1119         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1120             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1121                 tp->request_r_scale++;
1122
1123         soisconnecting(so);
1124         V_tcpstat.tcps_connattempt++;
1125         tp->t_state = TCPS_SYN_SENT;
1126         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1127         tp->iss = tcp_new_isn(tp);
1128         tp->t_bw_rtseq = tp->iss;
1129         tcp_sendseqinit(tp);
1130
1131         return 0;
1132 }
1133
1134 #ifdef INET6
1135 static int
1136 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1137 {
1138         struct inpcb *inp = tp->t_inpcb, *oinp;
1139         struct socket *so = inp->inp_socket;
1140         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1141         struct in6_addr *addr6;
1142         int error;
1143
1144         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1145         INP_WLOCK_ASSERT(inp);
1146
1147         if (inp->inp_lport == 0) {
1148                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1149                 if (error)
1150                         return error;
1151         }
1152
1153         /*
1154          * Cannot simply call in_pcbconnect, because there might be an
1155          * earlier incarnation of this same connection still in
1156          * TIME_WAIT state, creating an ADDRINUSE error.
1157          * in6_pcbladdr() also handles scope zone IDs.
1158          */
1159         error = in6_pcbladdr(inp, nam, &addr6);
1160         if (error)
1161                 return error;
1162         oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
1163                                   &sin6->sin6_addr, sin6->sin6_port,
1164                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1165                                   ? addr6
1166                                   : &inp->in6p_laddr,
1167                                   inp->inp_lport,  0, NULL);
1168         if (oinp)
1169                 return EADDRINUSE;
1170         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1171                 inp->in6p_laddr = *addr6;
1172         inp->in6p_faddr = sin6->sin6_addr;
1173         inp->inp_fport = sin6->sin6_port;
1174         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1175         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
1176         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
1177                 inp->in6p_flowinfo |=
1178                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1179         in_pcbrehash(inp);
1180
1181         /* Compute window scaling to request.  */
1182         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1183             (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
1184                 tp->request_r_scale++;
1185
1186         soisconnecting(so);
1187         V_tcpstat.tcps_connattempt++;
1188         tp->t_state = TCPS_SYN_SENT;
1189         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
1190         tp->iss = tcp_new_isn(tp);
1191         tp->t_bw_rtseq = tp->iss;
1192         tcp_sendseqinit(tp);
1193
1194         return 0;
1195 }
1196 #endif /* INET6 */
1197
1198 /*
1199  * Export TCP internal state information via a struct tcp_info, based on the
1200  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1201  * (TCP state machine, etc).  We export all information using FreeBSD-native
1202  * constants -- for example, the numeric values for tcpi_state will differ
1203  * from Linux.
1204  */
1205 static void
1206 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1207 {
1208
1209         INP_WLOCK_ASSERT(tp->t_inpcb);
1210         bzero(ti, sizeof(*ti));
1211
1212         ti->tcpi_state = tp->t_state;
1213         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1214                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1215         if (tp->t_flags & TF_SACK_PERMIT)
1216                 ti->tcpi_options |= TCPI_OPT_SACK;
1217         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1218                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1219                 ti->tcpi_snd_wscale = tp->snd_scale;
1220                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1221         }
1222
1223         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1224         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1225
1226         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1227         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1228
1229         /*
1230          * FreeBSD-specific extension fields for tcp_info.
1231          */
1232         ti->tcpi_rcv_space = tp->rcv_wnd;
1233         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1234         ti->tcpi_snd_wnd = tp->snd_wnd;
1235         ti->tcpi_snd_bwnd = tp->snd_bwnd;
1236         ti->tcpi_snd_nxt = tp->snd_nxt;
1237         ti->__tcpi_snd_mss = tp->t_maxseg;
1238         ti->__tcpi_rcv_mss = tp->t_maxseg;
1239         if (tp->t_flags & TF_TOE)
1240                 ti->tcpi_options |= TCPI_OPT_TOE;
1241 }
1242
1243 /*
1244  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1245  * socket option arguments.  When it re-acquires the lock after the copy, it
1246  * has to revalidate that the connection is still valid for the socket
1247  * option.
1248  */
1249 #define INP_WLOCK_RECHECK(inp) do {                                     \
1250         INP_WLOCK(inp);                                                 \
1251         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {            \
1252                 INP_WUNLOCK(inp);                                       \
1253                 return (ECONNRESET);                                    \
1254         }                                                               \
1255         tp = intotcpcb(inp);                                            \
1256 } while(0)
1257
1258 int
1259 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1260 {
1261         int     error, opt, optval;
1262         struct  inpcb *inp;
1263         struct  tcpcb *tp;
1264         struct  tcp_info ti;
1265
1266         error = 0;
1267         inp = sotoinpcb(so);
1268         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1269         INP_WLOCK(inp);
1270         if (sopt->sopt_level != IPPROTO_TCP) {
1271 #ifdef INET6
1272                 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
1273                         INP_WUNLOCK(inp);
1274                         error = ip6_ctloutput(so, sopt);
1275                 } else {
1276 #endif /* INET6 */
1277                         INP_WUNLOCK(inp);
1278                         error = ip_ctloutput(so, sopt);
1279 #ifdef INET6
1280                 }
1281 #endif
1282                 return (error);
1283         }
1284         if (inp->inp_vflag & (INP_TIMEWAIT | INP_DROPPED)) {
1285                 INP_WUNLOCK(inp);
1286                 return (ECONNRESET);
1287         }
1288
1289         switch (sopt->sopt_dir) {
1290         case SOPT_SET:
1291                 switch (sopt->sopt_name) {
1292 #ifdef TCP_SIGNATURE
1293                 case TCP_MD5SIG:
1294                         INP_WUNLOCK(inp);
1295                         error = sooptcopyin(sopt, &optval, sizeof optval,
1296                             sizeof optval);
1297                         if (error)
1298                                 return (error);
1299
1300                         INP_WLOCK_RECHECK(inp);
1301                         if (optval > 0)
1302                                 tp->t_flags |= TF_SIGNATURE;
1303                         else
1304                                 tp->t_flags &= ~TF_SIGNATURE;
1305                         INP_WUNLOCK(inp);
1306                         break;
1307 #endif /* TCP_SIGNATURE */
1308                 case TCP_NODELAY:
1309                 case TCP_NOOPT:
1310                         INP_WUNLOCK(inp);
1311                         error = sooptcopyin(sopt, &optval, sizeof optval,
1312                             sizeof optval);
1313                         if (error)
1314                                 return (error);
1315
1316                         INP_WLOCK_RECHECK(inp);
1317                         switch (sopt->sopt_name) {
1318                         case TCP_NODELAY:
1319                                 opt = TF_NODELAY;
1320                                 break;
1321                         case TCP_NOOPT:
1322                                 opt = TF_NOOPT;
1323                                 break;
1324                         default:
1325                                 opt = 0; /* dead code to fool gcc */
1326                                 break;
1327                         }
1328
1329                         if (optval)
1330                                 tp->t_flags |= opt;
1331                         else
1332                                 tp->t_flags &= ~opt;
1333                         INP_WUNLOCK(inp);
1334                         break;
1335
1336                 case TCP_NOPUSH:
1337                         INP_WUNLOCK(inp);
1338                         error = sooptcopyin(sopt, &optval, sizeof optval,
1339                             sizeof optval);
1340                         if (error)
1341                                 return (error);
1342
1343                         INP_WLOCK_RECHECK(inp);
1344                         if (optval)
1345                                 tp->t_flags |= TF_NOPUSH;
1346                         else {
1347                                 tp->t_flags &= ~TF_NOPUSH;
1348                                 error = tcp_output(tp);
1349                         }
1350                         INP_WUNLOCK(inp);
1351                         break;
1352
1353                 case TCP_MAXSEG:
1354                         INP_WUNLOCK(inp);
1355                         error = sooptcopyin(sopt, &optval, sizeof optval,
1356                             sizeof optval);
1357                         if (error)
1358                                 return (error);
1359
1360                         INP_WLOCK_RECHECK(inp);
1361                         if (optval > 0 && optval <= tp->t_maxseg &&
1362                             optval + 40 >= V_tcp_minmss)
1363                                 tp->t_maxseg = optval;
1364                         else
1365                                 error = EINVAL;
1366                         INP_WUNLOCK(inp);
1367                         break;
1368
1369                 case TCP_INFO:
1370                         INP_WUNLOCK(inp);
1371                         error = EINVAL;
1372                         break;
1373
1374                 default:
1375                         INP_WUNLOCK(inp);
1376                         error = ENOPROTOOPT;
1377                         break;
1378                 }
1379                 break;
1380
1381         case SOPT_GET:
1382                 tp = intotcpcb(inp);
1383                 switch (sopt->sopt_name) {
1384 #ifdef TCP_SIGNATURE
1385                 case TCP_MD5SIG:
1386                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1387                         INP_WUNLOCK(inp);
1388                         error = sooptcopyout(sopt, &optval, sizeof optval);
1389                         break;
1390 #endif
1391
1392                 case TCP_NODELAY:
1393                         optval = tp->t_flags & TF_NODELAY;
1394                         INP_WUNLOCK(inp);
1395                         error = sooptcopyout(sopt, &optval, sizeof optval);
1396                         break;
1397                 case TCP_MAXSEG:
1398                         optval = tp->t_maxseg;
1399                         INP_WUNLOCK(inp);
1400                         error = sooptcopyout(sopt, &optval, sizeof optval);
1401                         break;
1402                 case TCP_NOOPT:
1403                         optval = tp->t_flags & TF_NOOPT;
1404                         INP_WUNLOCK(inp);
1405                         error = sooptcopyout(sopt, &optval, sizeof optval);
1406                         break;
1407                 case TCP_NOPUSH:
1408                         optval = tp->t_flags & TF_NOPUSH;
1409                         INP_WUNLOCK(inp);
1410                         error = sooptcopyout(sopt, &optval, sizeof optval);
1411                         break;
1412                 case TCP_INFO:
1413                         tcp_fill_info(tp, &ti);
1414                         INP_WUNLOCK(inp);
1415                         error = sooptcopyout(sopt, &ti, sizeof ti);
1416                         break;
1417                 default:
1418                         INP_WUNLOCK(inp);
1419                         error = ENOPROTOOPT;
1420                         break;
1421                 }
1422                 break;
1423         }
1424         return (error);
1425 }
1426 #undef INP_WLOCK_RECHECK
1427
1428 /*
1429  * tcp_sendspace and tcp_recvspace are the default send and receive window
1430  * sizes, respectively.  These are obsolescent (this information should
1431  * be set by the route).
1432  */
1433 u_long  tcp_sendspace = 1024*32;
1434 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
1435     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
1436 u_long  tcp_recvspace = 1024*64;
1437 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
1438     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
1439
1440 /*
1441  * Attach TCP protocol to socket, allocating
1442  * internet protocol control block, tcp control block,
1443  * bufer space, and entering LISTEN state if to accept connections.
1444  */
1445 static int
1446 tcp_attach(struct socket *so)
1447 {
1448         struct tcpcb *tp;
1449         struct inpcb *inp;
1450         int error;
1451 #ifdef INET6
1452         int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
1453 #endif
1454
1455         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1456                 error = soreserve(so, tcp_sendspace, tcp_recvspace);
1457                 if (error)
1458                         return (error);
1459         }
1460         so->so_rcv.sb_flags |= SB_AUTOSIZE;
1461         so->so_snd.sb_flags |= SB_AUTOSIZE;
1462         INP_INFO_WLOCK(&V_tcbinfo);
1463         error = in_pcballoc(so, &V_tcbinfo);
1464         if (error) {
1465                 INP_INFO_WUNLOCK(&V_tcbinfo);
1466                 return (error);
1467         }
1468         inp = sotoinpcb(so);
1469 #ifdef INET6
1470         if (isipv6) {
1471                 inp->inp_vflag |= INP_IPV6;
1472                 inp->in6p_hops = -1;    /* use kernel default */
1473         }
1474         else
1475 #endif
1476         inp->inp_vflag |= INP_IPV4;
1477         tp = tcp_newtcpcb(inp);
1478         if (tp == NULL) {
1479 #ifdef INET6
1480                 if (isipv6) {
1481                         in6_pcbdetach(inp);
1482                         in6_pcbfree(inp);
1483                 } else {
1484 #endif
1485                         in_pcbdetach(inp);
1486                         in_pcbfree(inp);
1487 #ifdef INET6
1488                 }
1489 #endif
1490                 INP_INFO_WUNLOCK(&V_tcbinfo);
1491                 return (ENOBUFS);
1492         }
1493         tp->t_state = TCPS_CLOSED;
1494         INP_WUNLOCK(inp);
1495         INP_INFO_WUNLOCK(&V_tcbinfo);
1496         return (0);
1497 }
1498
1499 /*
1500  * Initiate (or continue) disconnect.
1501  * If embryonic state, just send reset (once).
1502  * If in ``let data drain'' option and linger null, just drop.
1503  * Otherwise (hard), mark socket disconnecting and drop
1504  * current input data; switch states based on user close, and
1505  * send segment to peer (with FIN).
1506  */
1507 static void
1508 tcp_disconnect(struct tcpcb *tp)
1509 {
1510         struct inpcb *inp = tp->t_inpcb;
1511         struct socket *so = inp->inp_socket;
1512
1513         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1514         INP_WLOCK_ASSERT(inp);
1515
1516         /*
1517          * Neither tcp_close() nor tcp_drop() should return NULL, as the
1518          * socket is still open.
1519          */
1520         if (tp->t_state < TCPS_ESTABLISHED) {
1521                 tp = tcp_close(tp);
1522                 KASSERT(tp != NULL,
1523                     ("tcp_disconnect: tcp_close() returned NULL"));
1524         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1525                 tp = tcp_drop(tp, 0);
1526                 KASSERT(tp != NULL,
1527                     ("tcp_disconnect: tcp_drop() returned NULL"));
1528         } else {
1529                 soisdisconnecting(so);
1530                 sbflush(&so->so_rcv);
1531                 tcp_usrclosed(tp);
1532                 if (!(inp->inp_vflag & INP_DROPPED))
1533                         tcp_output_disconnect(tp);
1534         }
1535 }
1536
1537 /*
1538  * User issued close, and wish to trail through shutdown states:
1539  * if never received SYN, just forget it.  If got a SYN from peer,
1540  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1541  * If already got a FIN from peer, then almost done; go to LAST_ACK
1542  * state.  In all other cases, have already sent FIN to peer (e.g.
1543  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1544  * for peer to send FIN or not respond to keep-alives, etc.
1545  * We can let the user exit from the close as soon as the FIN is acked.
1546  */
1547 static void
1548 tcp_usrclosed(struct tcpcb *tp)
1549 {
1550
1551         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1552         INP_WLOCK_ASSERT(tp->t_inpcb);
1553
1554         switch (tp->t_state) {
1555         case TCPS_LISTEN:
1556                 tcp_offload_listen_close(tp);
1557                 /* FALLTHROUGH */
1558         case TCPS_CLOSED:
1559                 tp->t_state = TCPS_CLOSED;
1560                 tp = tcp_close(tp);
1561                 /*
1562                  * tcp_close() should never return NULL here as the socket is
1563                  * still open.
1564                  */
1565                 KASSERT(tp != NULL,
1566                     ("tcp_usrclosed: tcp_close() returned NULL"));
1567                 break;
1568
1569         case TCPS_SYN_SENT:
1570         case TCPS_SYN_RECEIVED:
1571                 tp->t_flags |= TF_NEEDFIN;
1572                 break;
1573
1574         case TCPS_ESTABLISHED:
1575                 tp->t_state = TCPS_FIN_WAIT_1;
1576                 break;
1577
1578         case TCPS_CLOSE_WAIT:
1579                 tp->t_state = TCPS_LAST_ACK;
1580                 break;
1581         }
1582         if (tp->t_state >= TCPS_FIN_WAIT_2) {
1583                 soisdisconnected(tp->t_inpcb->inp_socket);
1584                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1585                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1586                         int timeout;
1587
1588                         timeout = (tcp_fast_finwait2_recycle) ?
1589                             tcp_finwait2_timeout : tcp_maxidle;
1590                         tcp_timer_activate(tp, TT_2MSL, timeout);
1591                 }
1592         }
1593 }
1594
1595 #ifdef DDB
1596 static void
1597 db_print_indent(int indent)
1598 {
1599         int i;
1600
1601         for (i = 0; i < indent; i++)
1602                 db_printf(" ");
1603 }
1604
1605 static void
1606 db_print_tstate(int t_state)
1607 {
1608
1609         switch (t_state) {
1610         case TCPS_CLOSED:
1611                 db_printf("TCPS_CLOSED");
1612                 return;
1613
1614         case TCPS_LISTEN:
1615                 db_printf("TCPS_LISTEN");
1616                 return;
1617
1618         case TCPS_SYN_SENT:
1619                 db_printf("TCPS_SYN_SENT");
1620                 return;
1621
1622         case TCPS_SYN_RECEIVED:
1623                 db_printf("TCPS_SYN_RECEIVED");
1624                 return;
1625
1626         case TCPS_ESTABLISHED:
1627                 db_printf("TCPS_ESTABLISHED");
1628                 return;
1629
1630         case TCPS_CLOSE_WAIT:
1631                 db_printf("TCPS_CLOSE_WAIT");
1632                 return;
1633
1634         case TCPS_FIN_WAIT_1:
1635                 db_printf("TCPS_FIN_WAIT_1");
1636                 return;
1637
1638         case TCPS_CLOSING:
1639                 db_printf("TCPS_CLOSING");
1640                 return;
1641
1642         case TCPS_LAST_ACK:
1643                 db_printf("TCPS_LAST_ACK");
1644                 return;
1645
1646         case TCPS_FIN_WAIT_2:
1647                 db_printf("TCPS_FIN_WAIT_2");
1648                 return;
1649
1650         case TCPS_TIME_WAIT:
1651                 db_printf("TCPS_TIME_WAIT");
1652                 return;
1653
1654         default:
1655                 db_printf("unknown");
1656                 return;
1657         }
1658 }
1659
1660 static void
1661 db_print_tflags(u_int t_flags)
1662 {
1663         int comma;
1664
1665         comma = 0;
1666         if (t_flags & TF_ACKNOW) {
1667                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1668                 comma = 1;
1669         }
1670         if (t_flags & TF_DELACK) {
1671                 db_printf("%sTF_DELACK", comma ? ", " : "");
1672                 comma = 1;
1673         }
1674         if (t_flags & TF_NODELAY) {
1675                 db_printf("%sTF_NODELAY", comma ? ", " : "");
1676                 comma = 1;
1677         }
1678         if (t_flags & TF_NOOPT) {
1679                 db_printf("%sTF_NOOPT", comma ? ", " : "");
1680                 comma = 1;
1681         }
1682         if (t_flags & TF_SENTFIN) {
1683                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1684                 comma = 1;
1685         }
1686         if (t_flags & TF_REQ_SCALE) {
1687                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1688                 comma = 1;
1689         }
1690         if (t_flags & TF_RCVD_SCALE) {
1691                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1692                 comma = 1;
1693         }
1694         if (t_flags & TF_REQ_TSTMP) {
1695                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1696                 comma = 1;
1697         }
1698         if (t_flags & TF_RCVD_TSTMP) {
1699                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1700                 comma = 1;
1701         }
1702         if (t_flags & TF_SACK_PERMIT) {
1703                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1704                 comma = 1;
1705         }
1706         if (t_flags & TF_NEEDSYN) {
1707                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1708                 comma = 1;
1709         }
1710         if (t_flags & TF_NEEDFIN) {
1711                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1712                 comma = 1;
1713         }
1714         if (t_flags & TF_NOPUSH) {
1715                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1716                 comma = 1;
1717         }
1718         if (t_flags & TF_NOPUSH) {
1719                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1720                 comma = 1;
1721         }
1722         if (t_flags & TF_MORETOCOME) {
1723                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1724                 comma = 1;
1725         }
1726         if (t_flags & TF_LQ_OVERFLOW) {
1727                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1728                 comma = 1;
1729         }
1730         if (t_flags & TF_LASTIDLE) {
1731                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1732                 comma = 1;
1733         }
1734         if (t_flags & TF_RXWIN0SENT) {
1735                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1736                 comma = 1;
1737         }
1738         if (t_flags & TF_FASTRECOVERY) {
1739                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1740                 comma = 1;
1741         }
1742         if (t_flags & TF_WASFRECOVERY) {
1743                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1744                 comma = 1;
1745         }
1746         if (t_flags & TF_SIGNATURE) {
1747                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1748                 comma = 1;
1749         }
1750         if (t_flags & TF_FORCEDATA) {
1751                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1752                 comma = 1;
1753         }
1754         if (t_flags & TF_TSO) {
1755                 db_printf("%sTF_TSO", comma ? ", " : "");
1756                 comma = 1;
1757         }
1758         if (t_flags & TF_ECN_PERMIT) {
1759                 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
1760                 comma = 1;
1761         }
1762 }
1763
1764 static void
1765 db_print_toobflags(char t_oobflags)
1766 {
1767         int comma;
1768
1769         comma = 0;
1770         if (t_oobflags & TCPOOB_HAVEDATA) {
1771                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1772                 comma = 1;
1773         }
1774         if (t_oobflags & TCPOOB_HADDATA) {
1775                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1776                 comma = 1;
1777         }
1778 }
1779
1780 static void
1781 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1782 {
1783
1784         db_print_indent(indent);
1785         db_printf("%s at %p\n", name, tp);
1786
1787         indent += 2;
1788
1789         db_print_indent(indent);
1790         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
1791            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1792
1793         db_print_indent(indent);
1794         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
1795             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1796
1797         db_print_indent(indent);
1798         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1799             &tp->t_timers->tt_delack, tp->t_inpcb);
1800
1801         db_print_indent(indent);
1802         db_printf("t_state: %d (", tp->t_state);
1803         db_print_tstate(tp->t_state);
1804         db_printf(")\n");
1805
1806         db_print_indent(indent);
1807         db_printf("t_flags: 0x%x (", tp->t_flags);
1808         db_print_tflags(tp->t_flags);
1809         db_printf(")\n");
1810
1811         db_print_indent(indent);
1812         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
1813             tp->snd_una, tp->snd_max, tp->snd_nxt);
1814
1815         db_print_indent(indent);
1816         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
1817            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1818
1819         db_print_indent(indent);
1820         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
1821             tp->iss, tp->irs, tp->rcv_nxt);
1822
1823         db_print_indent(indent);
1824         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
1825             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1826
1827         db_print_indent(indent);
1828         db_printf("snd_wnd: %lu   snd_cwnd: %lu   snd_bwnd: %lu\n",
1829            tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
1830
1831         db_print_indent(indent);
1832         db_printf("snd_ssthresh: %lu   snd_bandwidth: %lu   snd_recover: "
1833             "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
1834             tp->snd_recover);
1835
1836         db_print_indent(indent);
1837         db_printf("t_maxopd: %u   t_rcvtime: %lu   t_startime: %lu\n",
1838             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1839
1840         db_print_indent(indent);
1841         db_printf("t_rttime: %d   t_rtsq: 0x%08x   t_bw_rtttime: %d\n",
1842             tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
1843
1844         db_print_indent(indent);
1845         db_printf("t_bw_rtseq: 0x%08x   t_rxtcur: %d   t_maxseg: %u   "
1846             "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
1847             tp->t_srtt);
1848
1849         db_print_indent(indent);
1850         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
1851             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
1852             tp->t_rttbest);
1853
1854         db_print_indent(indent);
1855         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
1856             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
1857
1858         db_print_indent(indent);
1859         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
1860         db_print_toobflags(tp->t_oobflags);
1861         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
1862
1863         db_print_indent(indent);
1864         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
1865             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
1866
1867         db_print_indent(indent);
1868         db_printf("ts_recent: %u   ts_recent_age: %lu\n",
1869             tp->ts_recent, tp->ts_recent_age);
1870
1871         db_print_indent(indent);
1872         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
1873             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
1874
1875         db_print_indent(indent);
1876         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
1877             "t_badrxtwin: %lu\n", tp->snd_ssthresh_prev,
1878             tp->snd_recover_prev, tp->t_badrxtwin);
1879
1880         db_print_indent(indent);
1881         db_printf("snd_numholes: %d  snd_holes first: %p\n",
1882             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
1883
1884         db_print_indent(indent);
1885         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
1886             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
1887
1888         /* Skip sackblks, sackhint. */
1889
1890         db_print_indent(indent);
1891         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
1892             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
1893 }
1894
1895 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
1896 {
1897         struct tcpcb *tp;
1898
1899         if (!have_addr) {
1900                 db_printf("usage: show tcpcb <addr>\n");
1901                 return;
1902         }
1903         tp = (struct tcpcb *)addr;
1904
1905         db_print_tcpcb(tp, "tcpcb", 0);
1906 }
1907 #endif