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