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  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * All rights reserved.
   7  *
   8  * Portions of this software were developed by Robert N. M. Watson under
   9  * contract to Juniper Networks, Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      From: @(#)tcp_usrreq.c  8.2 (Berkeley) 1/3/94
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include "opt_ddb.h"
  42 #include "opt_inet.h"
  43 #include "opt_inet6.h"
  44 #include "opt_tcpdebug.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/limits.h>
  49 #include <sys/malloc.h>
  50 #include <sys/kernel.h>
  51 #include <sys/sysctl.h>
  52 #include <sys/mbuf.h>
  53 #ifdef INET6
  54 #include <sys/domain.h>
  55 #endif /* INET6 */
  56 #include <sys/socket.h>
  57 #include <sys/socketvar.h>
  58 #include <sys/protosw.h>
  59 #include <sys/proc.h>
  60 #include <sys/jail.h>
  61
  62 #ifdef DDB
  63 #include <ddb/ddb.h>
  64 #endif
  65
  66 #include <net/if.h>
  67 #include <net/route.h>
  68 #include <net/vnet.h>
  69
  70 #include <netinet/cc.h>
  71 #include <netinet/in.h>
  72 #include <netinet/in_pcb.h>
  73 #include <netinet/in_systm.h>
  74 #include <netinet/in_var.h>
  75 #include <netinet/ip_var.h>
  76 #ifdef INET6
  77 #include <netinet/ip6.h>
  78 #include <netinet6/in6_pcb.h>
  79 #include <netinet6/ip6_var.h>
  80 #include <netinet6/scope6_var.h>
  81 #endif
  82 #include <netinet/tcp_fsm.h>
  83 #include <netinet/tcp_seq.h>
  84 #include <netinet/tcp_timer.h>
  85 #include <netinet/tcp_var.h>
  86 #include <netinet/tcpip.h>
  87 #ifdef TCPDEBUG
  88 #include <netinet/tcp_debug.h>
  89 #endif
  90 #ifdef TCP_OFFLOAD
  91 #include <netinet/tcp_offload.h>
  92 #endif
  93
  94 /*
  95  * TCP protocol interface to socket abstraction.
  96  */
  97 static int      tcp_attach(struct socket *);
  98 #ifdef INET
  99 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
 100                     struct thread *td);
 101 #endif /* INET */
 102 #ifdef INET6
 103 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
 104                     struct thread *td);
 105 #endif /* INET6 */
 106 static void     tcp_disconnect(struct tcpcb *);
 107 static void     tcp_usrclosed(struct tcpcb *);
 108 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 109
 110 #ifdef TCPDEBUG
 111 #define TCPDEBUG0       int ostate = 0
 112 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 113 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 114                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 115 #else
 116 #define TCPDEBUG0
 117 #define TCPDEBUG1()
 118 #define TCPDEBUG2(req)
 119 #endif
 120
 121 /*
 122  * TCP attaches to socket via pru_attach(), reserving space,
 123  * and an internet control block.
 124  */
 125 static int
 126 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 127 {
 128         struct inpcb *inp;
 129         struct tcpcb *tp = NULL;
 130         int error;
 131         TCPDEBUG0;
 132
 133         inp = sotoinpcb(so);
 134         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 135         TCPDEBUG1();
 136
 137         error = tcp_attach(so);
 138         if (error)
 139                 goto out;
 140
 141         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 142                 so->so_linger = TCP_LINGERTIME;
 143
 144         inp = sotoinpcb(so);
 145         tp = intotcpcb(inp);
 146 out:
 147         TCPDEBUG2(PRU_ATTACH);
 148         return error;
 149 }
 150
 151 /*
 152  * tcp_detach is called when the socket layer loses its final reference
 153  * to the socket, be it a file descriptor reference, a reference from TCP,
 154  * etc.  At this point, there is only one case in which we will keep around
 155  * inpcb state: time wait.
 156  *
 157  * This function can probably be re-absorbed back into tcp_usr_detach() now
 158  * that there is a single detach path.
 159  */
 160 static void
 161 tcp_detach(struct socket *so, struct inpcb *inp)
 162 {
 163         struct tcpcb *tp;
 164
 165         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 166         INP_WLOCK_ASSERT(inp);
 167
 168         KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
 169         KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
 170
 171         tp = intotcpcb(inp);
 172
 173         if (inp->inp_flags & INP_TIMEWAIT) {
 174                 /*
 175                  * There are two cases to handle: one in which the time wait
 176                  * state is being discarded (INP_DROPPED), and one in which
 177                  * this connection will remain in timewait.  In the former,
 178                  * it is time to discard all state (except tcptw, which has
 179                  * already been discarded by the timewait close code, which
 180                  * should be further up the call stack somewhere).  In the
 181                  * latter case, we detach from the socket, but leave the pcb
 182                  * present until timewait ends.
 183                  *
 184                  * XXXRW: Would it be cleaner to free the tcptw here?
 185                  */
 186                 if (inp->inp_flags & INP_DROPPED) {
 187                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 188                             "INP_DROPPED && tp != NULL"));
 189                         in_pcbdetach(inp);
 190                         in_pcbfree(inp);
 191                 } else {
 192                         in_pcbdetach(inp);
 193                         INP_WUNLOCK(inp);
 194                 }
 195         } else {
 196                 /*
 197                  * If the connection is not in timewait, we consider two
 198                  * two conditions: one in which no further processing is
 199                  * necessary (dropped || embryonic), and one in which TCP is
 200                  * not yet done, but no longer requires the socket, so the
 201                  * pcb will persist for the time being.
 202                  *
 203                  * XXXRW: Does the second case still occur?
 204                  */
 205                 if (inp->inp_flags & INP_DROPPED ||
 206                     tp->t_state < TCPS_SYN_SENT) {
 207                         tcp_discardcb(tp);
 208                         in_pcbdetach(inp);
 209                         in_pcbfree(inp);
 210                 } else {
 211                         in_pcbdetach(inp);
 212                         INP_WUNLOCK(inp);
 213                 }
 214         }
 215 }
 216
 217 /*
 218  * pru_detach() detaches the TCP protocol from the socket.
 219  * If the protocol state is non-embryonic, then can't
 220  * do this directly: have to initiate a pru_disconnect(),
 221  * which may finish later; embryonic TCB's can just
 222  * be discarded here.
 223  */
 224 static void
 225 tcp_usr_detach(struct socket *so)
 226 {
 227         struct inpcb *inp;
 228
 229         inp = sotoinpcb(so);
 230         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
 231         INP_INFO_WLOCK(&V_tcbinfo);
 232         INP_WLOCK(inp);
 233         KASSERT(inp->inp_socket != NULL,
 234             ("tcp_usr_detach: inp_socket == NULL"));
 235         tcp_detach(so, inp);
 236         INP_INFO_WUNLOCK(&V_tcbinfo);
 237 }
 238
 239 #ifdef INET
 240 /*
 241  * Give the socket an address.
 242  */
 243 static int
 244 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 245 {
 246         int error = 0;
 247         struct inpcb *inp;
 248         struct tcpcb *tp = NULL;
 249         struct sockaddr_in *sinp;
 250
 251         sinp = (struct sockaddr_in *)nam;
 252         if (nam->sa_len != sizeof (*sinp))
 253                 return (EINVAL);
 254         /*
 255          * Must check for multicast addresses and disallow binding
 256          * to them.
 257          */
 258         if (sinp->sin_family == AF_INET &&
 259             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 260                 return (EAFNOSUPPORT);
 261
 262         TCPDEBUG0;
 263         inp = sotoinpcb(so);
 264         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 265         INP_WLOCK(inp);
 266         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 267                 error = EINVAL;
 268                 goto out;
 269         }
 270         tp = intotcpcb(inp);
 271         TCPDEBUG1();
 272         INP_HASH_WLOCK(&V_tcbinfo);
 273         error = in_pcbbind(inp, nam, td->td_ucred);
 274         INP_HASH_WUNLOCK(&V_tcbinfo);
 275 out:
 276         TCPDEBUG2(PRU_BIND);
 277         INP_WUNLOCK(inp);
 278
 279         return (error);
 280 }
 281 #endif /* INET */
 282
 283 #ifdef INET6
 284 static int
 285 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 286 {
 287         int error = 0;
 288         struct inpcb *inp;
 289         struct tcpcb *tp = NULL;
 290         struct sockaddr_in6 *sin6p;
 291
 292         sin6p = (struct sockaddr_in6 *)nam;
 293         if (nam->sa_len != sizeof (*sin6p))
 294                 return (EINVAL);
 295         /*
 296          * Must check for multicast addresses and disallow binding
 297          * to them.
 298          */
 299         if (sin6p->sin6_family == AF_INET6 &&
 300             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 301                 return (EAFNOSUPPORT);
 302
 303         TCPDEBUG0;
 304         inp = sotoinpcb(so);
 305         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 306         INP_WLOCK(inp);
 307         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 308                 error = EINVAL;
 309                 goto out;
 310         }
 311         tp = intotcpcb(inp);
 312         TCPDEBUG1();
 313         INP_HASH_WLOCK(&V_tcbinfo);
 314         inp->inp_vflag &= ~INP_IPV4;
 315         inp->inp_vflag |= INP_IPV6;
 316 #ifdef INET
 317         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 318                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 319                         inp->inp_vflag |= INP_IPV4;
 320                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 321                         struct sockaddr_in sin;
 322
 323                         in6_sin6_2_sin(&sin, sin6p);
 324                         inp->inp_vflag |= INP_IPV4;
 325                         inp->inp_vflag &= ~INP_IPV6;
 326                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 327                             td->td_ucred);
 328                         INP_HASH_WUNLOCK(&V_tcbinfo);
 329                         goto out;
 330                 }
 331         }
 332 #endif
 333         error = in6_pcbbind(inp, nam, td->td_ucred);
 334         INP_HASH_WUNLOCK(&V_tcbinfo);
 335 out:
 336         TCPDEBUG2(PRU_BIND);
 337         INP_WUNLOCK(inp);
 338         return (error);
 339 }
 340 #endif /* INET6 */
 341
 342 #ifdef INET
 343 /*
 344  * Prepare to accept connections.
 345  */
 346 static int
 347 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 348 {
 349         int error = 0;
 350         struct inpcb *inp;
 351         struct tcpcb *tp = NULL;
 352
 353         TCPDEBUG0;
 354         inp = sotoinpcb(so);
 355         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 356         INP_WLOCK(inp);
 357         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 358                 error = EINVAL;
 359                 goto out;
 360         }
 361         tp = intotcpcb(inp);
 362         TCPDEBUG1();
 363         SOCK_LOCK(so);
 364         error = solisten_proto_check(so);
 365         INP_HASH_WLOCK(&V_tcbinfo);
 366         if (error == 0 && inp->inp_lport == 0)
 367                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 368         INP_HASH_WUNLOCK(&V_tcbinfo);
 369         if (error == 0) {
 370                 tcp_state_change(tp, TCPS_LISTEN);
 371                 solisten_proto(so, backlog);
 372 #ifdef TCP_OFFLOAD
 373                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 374                         tcp_offload_listen_start(tp);
 375 #endif
 376         }
 377         SOCK_UNLOCK(so);
 378
 379 out:
 380         TCPDEBUG2(PRU_LISTEN);
 381         INP_WUNLOCK(inp);
 382         return (error);
 383 }
 384 #endif /* INET */
 385
 386 #ifdef INET6
 387 static int
 388 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 389 {
 390         int error = 0;
 391         struct inpcb *inp;
 392         struct tcpcb *tp = NULL;
 393
 394         TCPDEBUG0;
 395         inp = sotoinpcb(so);
 396         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 397         INP_WLOCK(inp);
 398         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 399                 error = EINVAL;
 400                 goto out;
 401         }
 402         tp = intotcpcb(inp);
 403         TCPDEBUG1();
 404         SOCK_LOCK(so);
 405         error = solisten_proto_check(so);
 406         INP_HASH_WLOCK(&V_tcbinfo);
 407         if (error == 0 && inp->inp_lport == 0) {
 408                 inp->inp_vflag &= ~INP_IPV4;
 409                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 410                         inp->inp_vflag |= INP_IPV4;
 411                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 412         }
 413         INP_HASH_WUNLOCK(&V_tcbinfo);
 414         if (error == 0) {
 415                 tcp_state_change(tp, TCPS_LISTEN);
 416                 solisten_proto(so, backlog);
 417 #ifdef TCP_OFFLOAD
 418                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 419                         tcp_offload_listen_start(tp);
 420 #endif
 421         }
 422         SOCK_UNLOCK(so);
 423
 424 out:
 425         TCPDEBUG2(PRU_LISTEN);
 426         INP_WUNLOCK(inp);
 427         return (error);
 428 }
 429 #endif /* INET6 */
 430
 431 #ifdef INET
 432 /*
 433  * Initiate connection to peer.
 434  * Create a template for use in transmissions on this connection.
 435  * Enter SYN_SENT state, and mark socket as connecting.
 436  * Start keep-alive timer, and seed output sequence space.
 437  * Send initial segment on connection.
 438  */
 439 static int
 440 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 441 {
 442         int error = 0;
 443         struct inpcb *inp;
 444         struct tcpcb *tp = NULL;
 445         struct sockaddr_in *sinp;
 446
 447         sinp = (struct sockaddr_in *)nam;
 448         if (nam->sa_len != sizeof (*sinp))
 449                 return (EINVAL);
 450         /*
 451          * Must disallow TCP ``connections'' to multicast addresses.
 452          */
 453         if (sinp->sin_family == AF_INET
 454             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 455                 return (EAFNOSUPPORT);
 456         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 457                 return (error);
 458
 459         TCPDEBUG0;
 460         inp = sotoinpcb(so);
 461         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 462         INP_WLOCK(inp);
 463         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 464                 error = EINVAL;
 465                 goto out;
 466         }
 467         tp = intotcpcb(inp);
 468         TCPDEBUG1();
 469         if ((error = tcp_connect(tp, nam, td)) != 0)
 470                 goto out;
 471 #ifdef TCP_OFFLOAD
 472         if (registered_toedevs > 0 &&
 473             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 474             (error = tcp_offload_connect(so, nam)) == 0)
 475                 goto out;
 476 #endif
 477         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 478         error = tcp_output(tp);
 479 out:
 480         TCPDEBUG2(PRU_CONNECT);
 481         INP_WUNLOCK(inp);
 482         return (error);
 483 }
 484 #endif /* INET */
 485
 486 #ifdef INET6
 487 static int
 488 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 489 {
 490         int error = 0;
 491         struct inpcb *inp;
 492         struct tcpcb *tp = NULL;
 493         struct sockaddr_in6 *sin6p;
 494
 495         TCPDEBUG0;
 496
 497         sin6p = (struct sockaddr_in6 *)nam;
 498         if (nam->sa_len != sizeof (*sin6p))
 499                 return (EINVAL);
 500         /*
 501          * Must disallow TCP ``connections'' to multicast addresses.
 502          */
 503         if (sin6p->sin6_family == AF_INET6
 504             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 505                 return (EAFNOSUPPORT);
 506
 507         inp = sotoinpcb(so);
 508         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 509         INP_WLOCK(inp);
 510         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 511                 error = EINVAL;
 512                 goto out;
 513         }
 514         tp = intotcpcb(inp);
 515         TCPDEBUG1();
 516 #ifdef INET
 517         /*
 518          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 519          * therefore probably require the hash lock, which isn't held here.
 520          * Is this a significant problem?
 521          */
 522         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 523                 struct sockaddr_in sin;
 524
 525                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 526                         error = EINVAL;
 527                         goto out;
 528                 }
 529
 530                 in6_sin6_2_sin(&sin, sin6p);
 531                 inp->inp_vflag |= INP_IPV4;
 532                 inp->inp_vflag &= ~INP_IPV6;
 533                 if ((error = prison_remote_ip4(td->td_ucred,
 534                     &sin.sin_addr)) != 0)
 535                         goto out;
 536                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 537                         goto out;
 538 #ifdef TCP_OFFLOAD
 539                 if (registered_toedevs > 0 &&
 540                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 541                     (error = tcp_offload_connect(so, nam)) == 0)
 542                         goto out;
 543 #endif
 544                 error = tcp_output(tp);
 545                 goto out;
 546         }
 547 #endif
 548         inp->inp_vflag &= ~INP_IPV4;
 549         inp->inp_vflag |= INP_IPV6;
 550         inp->inp_inc.inc_flags |= INC_ISIPV6;
 551         if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
 552                 goto out;
 553         if ((error = tcp6_connect(tp, nam, td)) != 0)
 554                 goto out;
 555 #ifdef TCP_OFFLOAD
 556         if (registered_toedevs > 0 &&
 557             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 558             (error = tcp_offload_connect(so, nam)) == 0)
 559                 goto out;
 560 #endif
 561         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 562         error = tcp_output(tp);
 563
 564 out:
 565         TCPDEBUG2(PRU_CONNECT);
 566         INP_WUNLOCK(inp);
 567         return (error);
 568 }
 569 #endif /* INET6 */
 570
 571 /*
 572  * Initiate disconnect from peer.
 573  * If connection never passed embryonic stage, just drop;
 574  * else if don't need to let data drain, then can just drop anyways,
 575  * else have to begin TCP shutdown process: mark socket disconnecting,
 576  * drain unread data, state switch to reflect user close, and
 577  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 578  * when peer sends FIN and acks ours.
 579  *
 580  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 581  */
 582 static int
 583 tcp_usr_disconnect(struct socket *so)
 584 {
 585         struct inpcb *inp;
 586         struct tcpcb *tp = NULL;
 587         int error = 0;
 588
 589         TCPDEBUG0;
 590         INP_INFO_WLOCK(&V_tcbinfo);
 591         inp = sotoinpcb(so);
 592         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 593         INP_WLOCK(inp);
 594         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 595                 error = ECONNRESET;
 596                 goto out;
 597         }
 598         tp = intotcpcb(inp);
 599         TCPDEBUG1();
 600         tcp_disconnect(tp);
 601 out:
 602         TCPDEBUG2(PRU_DISCONNECT);
 603         INP_WUNLOCK(inp);
 604         INP_INFO_WUNLOCK(&V_tcbinfo);
 605         return (error);
 606 }
 607
 608 #ifdef INET
 609 /*
 610  * Accept a connection.  Essentially all the work is done at higher levels;
 611  * just return the address of the peer, storing through addr.
 612  *
 613  * The rationale for acquiring the tcbinfo lock here is somewhat complicated,
 614  * and is described in detail in the commit log entry for r175612.  Acquiring
 615  * it delays an accept(2) racing with sonewconn(), which inserts the socket
 616  * before the inpcb address/port fields are initialized.  A better fix would
 617  * prevent the socket from being placed in the listen queue until all fields
 618  * are fully initialized.
 619  */
 620 static int
 621 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 622 {
 623         int error = 0;
 624         struct inpcb *inp = NULL;
 625         struct tcpcb *tp = NULL;
 626         struct in_addr addr;
 627         in_port_t port = 0;
 628         TCPDEBUG0;
 629
 630         if (so->so_state & SS_ISDISCONNECTED)
 631                 return (ECONNABORTED);
 632
 633         inp = sotoinpcb(so);
 634         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 635         INP_INFO_RLOCK(&V_tcbinfo);
 636         INP_WLOCK(inp);
 637         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 638                 error = ECONNABORTED;
 639                 goto out;
 640         }
 641         tp = intotcpcb(inp);
 642         TCPDEBUG1();
 643
 644         /*
 645          * We inline in_getpeeraddr and COMMON_END here, so that we can
 646          * copy the data of interest and defer the malloc until after we
 647          * release the lock.
 648          */
 649         port = inp->inp_fport;
 650         addr = inp->inp_faddr;
 651
 652 out:
 653         TCPDEBUG2(PRU_ACCEPT);
 654         INP_WUNLOCK(inp);
 655         INP_INFO_RUNLOCK(&V_tcbinfo);
 656         if (error == 0)
 657                 *nam = in_sockaddr(port, &addr);
 658         return error;
 659 }
 660 #endif /* INET */
 661
 662 #ifdef INET6
 663 static int
 664 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 665 {
 666         struct inpcb *inp = NULL;
 667         int error = 0;
 668         struct tcpcb *tp = NULL;
 669         struct in_addr addr;
 670         struct in6_addr addr6;
 671         in_port_t port = 0;
 672         int v4 = 0;
 673         TCPDEBUG0;
 674
 675         if (so->so_state & SS_ISDISCONNECTED)
 676                 return (ECONNABORTED);
 677
 678         inp = sotoinpcb(so);
 679         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 680         INP_INFO_RLOCK(&V_tcbinfo);
 681         INP_WLOCK(inp);
 682         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 683                 error = ECONNABORTED;
 684                 goto out;
 685         }
 686         tp = intotcpcb(inp);
 687         TCPDEBUG1();
 688
 689         /*
 690          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 691          * copy the data of interest and defer the malloc until after we
 692          * release the lock.
 693          */
 694         if (inp->inp_vflag & INP_IPV4) {
 695                 v4 = 1;
 696                 port = inp->inp_fport;
 697                 addr = inp->inp_faddr;
 698         } else {
 699                 port = inp->inp_fport;
 700                 addr6 = inp->in6p_faddr;
 701         }
 702
 703 out:
 704         TCPDEBUG2(PRU_ACCEPT);
 705         INP_WUNLOCK(inp);
 706         INP_INFO_RUNLOCK(&V_tcbinfo);
 707         if (error == 0) {
 708                 if (v4)
 709                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 710                 else
 711                         *nam = in6_sockaddr(port, &addr6);
 712         }
 713         return error;
 714 }
 715 #endif /* INET6 */
 716
 717 /*
 718  * Mark the connection as being incapable of further output.
 719  */
 720 static int
 721 tcp_usr_shutdown(struct socket *so)
 722 {
 723         int error = 0;
 724         struct inpcb *inp;
 725         struct tcpcb *tp = NULL;
 726
 727         TCPDEBUG0;
 728         INP_INFO_WLOCK(&V_tcbinfo);
 729         inp = sotoinpcb(so);
 730         KASSERT(inp != NULL, ("inp == NULL"));
 731         INP_WLOCK(inp);
 732         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 733                 error = ECONNRESET;
 734                 goto out;
 735         }
 736         tp = intotcpcb(inp);
 737         TCPDEBUG1();
 738         socantsendmore(so);
 739         tcp_usrclosed(tp);
 740         if (!(inp->inp_flags & INP_DROPPED))
 741                 error = tcp_output(tp);
 742
 743 out:
 744         TCPDEBUG2(PRU_SHUTDOWN);
 745         INP_WUNLOCK(inp);
 746         INP_INFO_WUNLOCK(&V_tcbinfo);
 747
 748         return (error);
 749 }
 750
 751 /*
 752  * After a receive, possibly send window update to peer.
 753  */
 754 static int
 755 tcp_usr_rcvd(struct socket *so, int flags)
 756 {
 757         struct inpcb *inp;
 758         struct tcpcb *tp = NULL;
 759         int error = 0;
 760
 761         TCPDEBUG0;
 762         inp = sotoinpcb(so);
 763         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 764         INP_WLOCK(inp);
 765         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 766                 error = ECONNRESET;
 767                 goto out;
 768         }
 769         tp = intotcpcb(inp);
 770         TCPDEBUG1();
 771 #ifdef TCP_OFFLOAD
 772         if (tp->t_flags & TF_TOE)
 773                 tcp_offload_rcvd(tp);
 774         else
 775 #endif
 776         tcp_output(tp);
 777
 778 out:
 779         TCPDEBUG2(PRU_RCVD);
 780         INP_WUNLOCK(inp);
 781         return (error);
 782 }
 783
 784 /*
 785  * Do a send by putting data in output queue and updating urgent
 786  * marker if URG set.  Possibly send more data.  Unlike the other
 787  * pru_*() routines, the mbuf chains are our responsibility.  We
 788  * must either enqueue them or free them.  The other pru_* routines
 789  * generally are caller-frees.
 790  */
 791 static int
 792 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 793     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 794 {
 795         int error = 0;
 796         struct inpcb *inp;
 797         struct tcpcb *tp = NULL;
 798 #ifdef INET6
 799         int isipv6;
 800 #endif
 801         TCPDEBUG0;
 802
 803         /*
 804          * We require the pcbinfo lock if we will close the socket as part of
 805          * this call.
 806          */
 807         if (flags & PRUS_EOF)
 808                 INP_INFO_WLOCK(&V_tcbinfo);
 809         inp = sotoinpcb(so);
 810         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 811         INP_WLOCK(inp);
 812         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 813                 if (control)
 814                         m_freem(control);
 815                 if (m)
 816                         m_freem(m);
 817                 error = ECONNRESET;
 818                 goto out;
 819         }
 820 #ifdef INET6
 821         isipv6 = nam && nam->sa_family == AF_INET6;
 822 #endif /* INET6 */
 823         tp = intotcpcb(inp);
 824         TCPDEBUG1();
 825         if (control) {
 826                 /* TCP doesn't do control messages (rights, creds, etc) */
 827                 if (control->m_len) {
 828                         m_freem(control);
 829                         if (m)
 830                                 m_freem(m);
 831                         error = EINVAL;
 832                         goto out;
 833                 }
 834                 m_freem(control);       /* empty control, just free it */
 835         }
 836         if (!(flags & PRUS_OOB)) {
 837                 sbappendstream(&so->so_snd, m);
 838                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 839                         /*
 840                          * Do implied connect if not yet connected,
 841                          * initialize window to default value, and
 842                          * initialize maxseg/maxopd using peer's cached
 843                          * MSS.
 844                          */
 845 #ifdef INET6
 846                         if (isipv6)
 847                                 error = tcp6_connect(tp, nam, td);
 848 #endif /* INET6 */
 849 #if defined(INET6) && defined(INET)
 850                         else
 851 #endif
 852 #ifdef INET
 853                                 error = tcp_connect(tp, nam, td);
 854 #endif
 855                         if (error)
 856                                 goto out;
 857                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 858                         tcp_mss(tp, -1);
 859                 }
 860                 if (flags & PRUS_EOF) {
 861                         /*
 862                          * Close the send side of the connection after
 863                          * the data is sent.
 864                          */
 865                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 866                         socantsendmore(so);
 867                         tcp_usrclosed(tp);
 868                 }
 869                 if (!(inp->inp_flags & INP_DROPPED)) {
 870                         if (flags & PRUS_MORETOCOME)
 871                                 tp->t_flags |= TF_MORETOCOME;
 872                         error = tcp_output(tp);
 873                         if (flags & PRUS_MORETOCOME)
 874                                 tp->t_flags &= ~TF_MORETOCOME;
 875                 }
 876         } else {
 877                 /*
 878                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 879                  */
 880                 SOCKBUF_LOCK(&so->so_snd);
 881                 if (sbspace(&so->so_snd) < -512) {
 882                         SOCKBUF_UNLOCK(&so->so_snd);
 883                         m_freem(m);
 884                         error = ENOBUFS;
 885                         goto out;
 886                 }
 887                 /*
 888                  * According to RFC961 (Assigned Protocols),
 889                  * the urgent pointer points to the last octet
 890                  * of urgent data.  We continue, however,
 891                  * to consider it to indicate the first octet
 892                  * of data past the urgent section.
 893                  * Otherwise, snd_up should be one lower.
 894                  */
 895                 sbappendstream_locked(&so->so_snd, m);
 896                 SOCKBUF_UNLOCK(&so->so_snd);
 897                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 898                         /*
 899                          * Do implied connect if not yet connected,
 900                          * initialize window to default value, and
 901                          * initialize maxseg/maxopd using peer's cached
 902                          * MSS.
 903                          */
 904 #ifdef INET6
 905                         if (isipv6)
 906                                 error = tcp6_connect(tp, nam, td);
 907 #endif /* INET6 */
 908 #if defined(INET6) && defined(INET)
 909                         else
 910 #endif
 911 #ifdef INET
 912                                 error = tcp_connect(tp, nam, td);
 913 #endif
 914                         if (error)
 915                                 goto out;
 916                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 917                         tcp_mss(tp, -1);
 918                 }
 919                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 920                 tp->t_flags |= TF_FORCEDATA;
 921                 error = tcp_output(tp);
 922                 tp->t_flags &= ~TF_FORCEDATA;
 923         }
 924 out:
 925         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
 926                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 927         INP_WUNLOCK(inp);
 928         if (flags & PRUS_EOF)
 929                 INP_INFO_WUNLOCK(&V_tcbinfo);
 930         return (error);
 931 }
 932
 933 /*
 934  * Abort the TCP.  Drop the connection abruptly.
 935  */
 936 static void
 937 tcp_usr_abort(struct socket *so)
 938 {
 939         struct inpcb *inp;
 940         struct tcpcb *tp = NULL;
 941         TCPDEBUG0;
 942
 943         inp = sotoinpcb(so);
 944         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
 945
 946         INP_INFO_WLOCK(&V_tcbinfo);
 947         INP_WLOCK(inp);
 948         KASSERT(inp->inp_socket != NULL,
 949             ("tcp_usr_abort: inp_socket == NULL"));
 950
 951         /*
 952          * If we still have full TCP state, and we're not dropped, drop.
 953          */
 954         if (!(inp->inp_flags & INP_TIMEWAIT) &&
 955             !(inp->inp_flags & INP_DROPPED)) {
 956                 tp = intotcpcb(inp);
 957                 TCPDEBUG1();
 958                 tcp_drop(tp, ECONNABORTED);
 959                 TCPDEBUG2(PRU_ABORT);
 960         }
 961         if (!(inp->inp_flags & INP_DROPPED)) {
 962                 SOCK_LOCK(so);
 963                 so->so_state |= SS_PROTOREF;
 964                 SOCK_UNLOCK(so);
 965                 inp->inp_flags |= INP_SOCKREF;
 966         }
 967         INP_WUNLOCK(inp);
 968         INP_INFO_WUNLOCK(&V_tcbinfo);
 969 }
 970
 971 /*
 972  * TCP socket is closed.  Start friendly disconnect.
 973  */
 974 static void
 975 tcp_usr_close(struct socket *so)
 976 {
 977         struct inpcb *inp;
 978         struct tcpcb *tp = NULL;
 979         TCPDEBUG0;
 980
 981         inp = sotoinpcb(so);
 982         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
 983
 984         INP_INFO_WLOCK(&V_tcbinfo);
 985         INP_WLOCK(inp);
 986         KASSERT(inp->inp_socket != NULL,
 987             ("tcp_usr_close: inp_socket == NULL"));
 988
 989         /*
 990          * If we still have full TCP state, and we're not dropped, initiate
 991          * a disconnect.
 992          */
 993         if (!(inp->inp_flags & INP_TIMEWAIT) &&
 994             !(inp->inp_flags & INP_DROPPED)) {
 995                 tp = intotcpcb(inp);
 996                 TCPDEBUG1();
 997                 tcp_disconnect(tp);
 998                 TCPDEBUG2(PRU_CLOSE);
 999         }
1000         if (!(inp->inp_flags & INP_DROPPED)) {
1001                 SOCK_LOCK(so);
1002                 so->so_state |= SS_PROTOREF;
1003                 SOCK_UNLOCK(so);
1004                 inp->inp_flags |= INP_SOCKREF;
1005         }
1006         INP_WUNLOCK(inp);
1007         INP_INFO_WUNLOCK(&V_tcbinfo);
1008 }
1009
1010 /*
1011  * Receive out-of-band data.
1012  */
1013 static int
1014 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1015 {
1016         int error = 0;
1017         struct inpcb *inp;
1018         struct tcpcb *tp = NULL;
1019
1020         TCPDEBUG0;
1021         inp = sotoinpcb(so);
1022         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1023         INP_WLOCK(inp);
1024         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1025                 error = ECONNRESET;
1026                 goto out;
1027         }
1028         tp = intotcpcb(inp);
1029         TCPDEBUG1();
1030         if ((so->so_oobmark == 0 &&
1031              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1032             so->so_options & SO_OOBINLINE ||
1033             tp->t_oobflags & TCPOOB_HADDATA) {
1034                 error = EINVAL;
1035                 goto out;
1036         }
1037         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1038                 error = EWOULDBLOCK;
1039                 goto out;
1040         }
1041         m->m_len = 1;
1042         *mtod(m, caddr_t) = tp->t_iobc;
1043         if ((flags & MSG_PEEK) == 0)
1044                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1045
1046 out:
1047         TCPDEBUG2(PRU_RCVOOB);
1048         INP_WUNLOCK(inp);
1049         return (error);
1050 }
1051
1052 #ifdef INET
1053 struct pr_usrreqs tcp_usrreqs = {
1054         .pru_abort =            tcp_usr_abort,
1055         .pru_accept =           tcp_usr_accept,
1056         .pru_attach =           tcp_usr_attach,
1057         .pru_bind =             tcp_usr_bind,
1058         .pru_connect =          tcp_usr_connect,
1059         .pru_control =          in_control,
1060         .pru_detach =           tcp_usr_detach,
1061         .pru_disconnect =       tcp_usr_disconnect,
1062         .pru_listen =           tcp_usr_listen,
1063         .pru_peeraddr =         in_getpeeraddr,
1064         .pru_rcvd =             tcp_usr_rcvd,
1065         .pru_rcvoob =           tcp_usr_rcvoob,
1066         .pru_send =             tcp_usr_send,
1067         .pru_shutdown =         tcp_usr_shutdown,
1068         .pru_sockaddr =         in_getsockaddr,
1069         .pru_sosetlabel =       in_pcbsosetlabel,
1070         .pru_close =            tcp_usr_close,
1071 };
1072 #endif /* INET */
1073
1074 #ifdef INET6
1075 struct pr_usrreqs tcp6_usrreqs = {
1076         .pru_abort =            tcp_usr_abort,
1077         .pru_accept =           tcp6_usr_accept,
1078         .pru_attach =           tcp_usr_attach,
1079         .pru_bind =             tcp6_usr_bind,
1080         .pru_connect =          tcp6_usr_connect,
1081         .pru_control =          in6_control,
1082         .pru_detach =           tcp_usr_detach,
1083         .pru_disconnect =       tcp_usr_disconnect,
1084         .pru_listen =           tcp6_usr_listen,
1085         .pru_peeraddr =         in6_mapped_peeraddr,
1086         .pru_rcvd =             tcp_usr_rcvd,
1087         .pru_rcvoob =           tcp_usr_rcvoob,
1088         .pru_send =             tcp_usr_send,
1089         .pru_shutdown =         tcp_usr_shutdown,
1090         .pru_sockaddr =         in6_mapped_sockaddr,
1091         .pru_sosetlabel =       in_pcbsosetlabel,
1092         .pru_close =            tcp_usr_close,
1093 };
1094 #endif /* INET6 */
1095
1096 #ifdef INET
1097 /*
1098  * Common subroutine to open a TCP connection to remote host specified
1099  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1100  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1101  * to choose a local host address (interface).  If there is an existing
1102  * incarnation of the same connection in TIME-WAIT state and if the remote
1103  * host was sending CC options and if the connection duration was < MSL, then
1104  * truncate the previous TIME-WAIT state and proceed.
1105  * Initialize connection parameters and enter SYN-SENT state.
1106  */
1107 static int
1108 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1109 {
1110         struct inpcb *inp = tp->t_inpcb, *oinp;
1111         struct socket *so = inp->inp_socket;
1112         struct in_addr laddr;
1113         u_short lport;
1114         int error;
1115
1116         INP_WLOCK_ASSERT(inp);
1117         INP_HASH_WLOCK(&V_tcbinfo);
1118
1119         if (inp->inp_lport == 0) {
1120                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1121                 if (error)
1122                         goto out;
1123         }
1124
1125         /*
1126          * Cannot simply call in_pcbconnect, because there might be an
1127          * earlier incarnation of this same connection still in
1128          * TIME_WAIT state, creating an ADDRINUSE error.
1129          */
1130         laddr = inp->inp_laddr;
1131         lport = inp->inp_lport;
1132         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1133             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1134         if (error && oinp == NULL)
1135                 goto out;
1136         if (oinp) {
1137                 error = EADDRINUSE;
1138                 goto out;
1139         }
1140         inp->inp_laddr = laddr;
1141         in_pcbrehash(inp);
1142         INP_HASH_WUNLOCK(&V_tcbinfo);
1143
1144         /*
1145          * Compute window scaling to request:
1146          * Scale to fit into sweet spot.  See tcp_syncache.c.
1147          * XXX: This should move to tcp_output().
1148          */
1149         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1150             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1151                 tp->request_r_scale++;
1152
1153         soisconnecting(so);
1154         TCPSTAT_INC(tcps_connattempt);
1155         tcp_state_change(tp, TCPS_SYN_SENT);
1156         tp->iss = tcp_new_isn(tp);
1157         tcp_sendseqinit(tp);
1158
1159         return 0;
1160
1161 out:
1162         INP_HASH_WUNLOCK(&V_tcbinfo);
1163         return (error);
1164 }
1165 #endif /* INET */
1166
1167 #ifdef INET6
1168 static int
1169 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1170 {
1171         struct inpcb *inp = tp->t_inpcb, *oinp;
1172         struct socket *so = inp->inp_socket;
1173         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1174         struct in6_addr addr6;
1175         int error;
1176
1177         INP_WLOCK_ASSERT(inp);
1178         INP_HASH_WLOCK(&V_tcbinfo);
1179
1180         if (inp->inp_lport == 0) {
1181                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1182                 if (error)
1183                         goto out;
1184         }
1185
1186         /*
1187          * Cannot simply call in_pcbconnect, because there might be an
1188          * earlier incarnation of this same connection still in
1189          * TIME_WAIT state, creating an ADDRINUSE error.
1190          * in6_pcbladdr() also handles scope zone IDs.
1191          *
1192          * XXXRW: We wouldn't need to expose in6_pcblookup_hash_locked()
1193          * outside of in6_pcb.c if there were an in6_pcbconnect_setup().
1194          */
1195         error = in6_pcbladdr(inp, nam, &addr6);
1196         if (error)
1197                 goto out;
1198         oinp = in6_pcblookup_hash_locked(inp->inp_pcbinfo,
1199                                   &sin6->sin6_addr, sin6->sin6_port,
1200                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1201                                   ? &addr6
1202                                   : &inp->in6p_laddr,
1203                                   inp->inp_lport,  0, NULL);
1204         if (oinp) {
1205                 error = EADDRINUSE;
1206                 goto out;
1207         }
1208         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1209                 inp->in6p_laddr = addr6;
1210         inp->in6p_faddr = sin6->sin6_addr;
1211         inp->inp_fport = sin6->sin6_port;
1212         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1213         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1214         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
1215                 inp->inp_flow |=
1216                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1217         in_pcbrehash(inp);
1218         INP_HASH_WUNLOCK(&V_tcbinfo);
1219
1220         /* Compute window scaling to request.  */
1221         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1222             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1223                 tp->request_r_scale++;
1224
1225         soisconnecting(so);
1226         TCPSTAT_INC(tcps_connattempt);
1227         tcp_state_change(tp, TCPS_SYN_SENT);
1228         tp->iss = tcp_new_isn(tp);
1229         tcp_sendseqinit(tp);
1230
1231         return 0;
1232
1233 out:
1234         INP_HASH_WUNLOCK(&V_tcbinfo);
1235         return error;
1236 }
1237 #endif /* INET6 */
1238
1239 /*
1240  * Export TCP internal state information via a struct tcp_info, based on the
1241  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1242  * (TCP state machine, etc).  We export all information using FreeBSD-native
1243  * constants -- for example, the numeric values for tcpi_state will differ
1244  * from Linux.
1245  */
1246 static void
1247 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1248 {
1249
1250         INP_WLOCK_ASSERT(tp->t_inpcb);
1251         bzero(ti, sizeof(*ti));
1252
1253         ti->tcpi_state = tp->t_state;
1254         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1255                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1256         if (tp->t_flags & TF_SACK_PERMIT)
1257                 ti->tcpi_options |= TCPI_OPT_SACK;
1258         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1259                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1260                 ti->tcpi_snd_wscale = tp->snd_scale;
1261                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1262         }
1263
1264         ti->tcpi_rto = tp->t_rxtcur * tick;
1265         ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
1266         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1267         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1268
1269         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1270         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1271
1272         /*
1273          * FreeBSD-specific extension fields for tcp_info.
1274          */
1275         ti->tcpi_rcv_space = tp->rcv_wnd;
1276         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1277         ti->tcpi_snd_wnd = tp->snd_wnd;
1278         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1279         ti->tcpi_snd_nxt = tp->snd_nxt;
1280         ti->tcpi_snd_mss = tp->t_maxseg;
1281         ti->tcpi_rcv_mss = tp->t_maxseg;
1282         if (tp->t_flags & TF_TOE)
1283                 ti->tcpi_options |= TCPI_OPT_TOE;
1284         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1285         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1286         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1287 }
1288
1289 /*
1290  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1291  * socket option arguments.  When it re-acquires the lock after the copy, it
1292  * has to revalidate that the connection is still valid for the socket
1293  * option.
1294  */
1295 #define INP_WLOCK_RECHECK(inp) do {                                     \
1296         INP_WLOCK(inp);                                                 \
1297         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1298                 INP_WUNLOCK(inp);                                       \
1299                 return (ECONNRESET);                                    \
1300         }                                                               \
1301         tp = intotcpcb(inp);                                            \
1302 } while(0)
1303
1304 int
1305 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1306 {
1307         int     error, opt, optval;
1308         u_int   ui;
1309         struct  inpcb *inp;
1310         struct  tcpcb *tp;
1311         struct  tcp_info ti;
1312         char buf[TCP_CA_NAME_MAX];
1313         struct cc_algo *algo;
1314
1315         error = 0;
1316         inp = sotoinpcb(so);
1317         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1318         INP_WLOCK(inp);
1319         if (sopt->sopt_level != IPPROTO_TCP) {
1320 #ifdef INET6
1321                 if (inp->inp_vflag & INP_IPV6PROTO) {
1322                         INP_WUNLOCK(inp);
1323                         error = ip6_ctloutput(so, sopt);
1324                 }
1325 #endif /* INET6 */
1326 #if defined(INET6) && defined(INET)
1327                 else
1328 #endif
1329 #ifdef INET
1330                 {
1331                         INP_WUNLOCK(inp);
1332                         error = ip_ctloutput(so, sopt);
1333                 }
1334 #endif
1335                 return (error);
1336         }
1337         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1338                 INP_WUNLOCK(inp);
1339                 return (ECONNRESET);
1340         }
1341
1342         switch (sopt->sopt_dir) {
1343         case SOPT_SET:
1344                 switch (sopt->sopt_name) {
1345 #ifdef TCP_SIGNATURE
1346                 case TCP_MD5SIG:
1347                         INP_WUNLOCK(inp);
1348                         error = sooptcopyin(sopt, &optval, sizeof optval,
1349                             sizeof optval);
1350                         if (error)
1351                                 return (error);
1352
1353                         INP_WLOCK_RECHECK(inp);
1354                         if (optval > 0)
1355                                 tp->t_flags |= TF_SIGNATURE;
1356                         else
1357                                 tp->t_flags &= ~TF_SIGNATURE;
1358                         goto unlock_and_done;
1359 #endif /* TCP_SIGNATURE */
1360
1361                 case TCP_NODELAY:
1362                 case TCP_NOOPT:
1363                         INP_WUNLOCK(inp);
1364                         error = sooptcopyin(sopt, &optval, sizeof optval,
1365                             sizeof optval);
1366                         if (error)
1367                                 return (error);
1368
1369                         INP_WLOCK_RECHECK(inp);
1370                         switch (sopt->sopt_name) {
1371                         case TCP_NODELAY:
1372                                 opt = TF_NODELAY;
1373                                 break;
1374                         case TCP_NOOPT:
1375                                 opt = TF_NOOPT;
1376                                 break;
1377                         default:
1378                                 opt = 0; /* dead code to fool gcc */
1379                                 break;
1380                         }
1381
1382                         if (optval)
1383                                 tp->t_flags |= opt;
1384                         else
1385                                 tp->t_flags &= ~opt;
1386 unlock_and_done:
1387 #ifdef TCP_OFFLOAD
1388                         if (tp->t_flags & TF_TOE) {
1389                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1390                                     sopt->sopt_name);
1391                         }
1392 #endif
1393                         INP_WUNLOCK(inp);
1394                         break;
1395
1396                 case TCP_NOPUSH:
1397                         INP_WUNLOCK(inp);
1398                         error = sooptcopyin(sopt, &optval, sizeof optval,
1399                             sizeof optval);
1400                         if (error)
1401                                 return (error);
1402
1403                         INP_WLOCK_RECHECK(inp);
1404                         if (optval)
1405                                 tp->t_flags |= TF_NOPUSH;
1406                         else if (tp->t_flags & TF_NOPUSH) {
1407                                 tp->t_flags &= ~TF_NOPUSH;
1408                                 if (TCPS_HAVEESTABLISHED(tp->t_state))
1409                                         error = tcp_output(tp);
1410                         }
1411                         goto unlock_and_done;
1412
1413                 case TCP_MAXSEG:
1414                         INP_WUNLOCK(inp);
1415                         error = sooptcopyin(sopt, &optval, sizeof optval,
1416                             sizeof optval);
1417                         if (error)
1418                                 return (error);
1419
1420                         INP_WLOCK_RECHECK(inp);
1421                         if (optval > 0 && optval <= tp->t_maxseg &&
1422                             optval + 40 >= V_tcp_minmss)
1423                                 tp->t_maxseg = optval;
1424                         else
1425                                 error = EINVAL;
1426                         goto unlock_and_done;
1427
1428                 case TCP_INFO:
1429                         INP_WUNLOCK(inp);
1430                         error = EINVAL;
1431                         break;
1432
1433                 case TCP_CONGESTION:
1434                         INP_WUNLOCK(inp);
1435                         bzero(buf, sizeof(buf));
1436                         error = sooptcopyin(sopt, &buf, sizeof(buf), 1);
1437                         if (error)
1438                                 break;
1439                         INP_WLOCK_RECHECK(inp);
1440                         /*
1441                          * Return EINVAL if we can't find the requested cc algo.
1442                          */
1443                         error = EINVAL;
1444                         CC_LIST_RLOCK();
1445                         STAILQ_FOREACH(algo, &cc_list, entries) {
1446                                 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX)
1447                                     == 0) {
1448                                         /* We've found the requested algo. */
1449                                         error = 0;
1450                                         /*
1451                                          * We hold a write lock over the tcb
1452                                          * so it's safe to do these things
1453                                          * without ordering concerns.
1454                                          */
1455                                         if (CC_ALGO(tp)->cb_destroy != NULL)
1456                                                 CC_ALGO(tp)->cb_destroy(tp->ccv);
1457                                         CC_ALGO(tp) = algo;
1458                                         /*
1459                                          * If something goes pear shaped
1460                                          * initialising the new algo,
1461                                          * fall back to newreno (which
1462                                          * does not require initialisation).
1463                                          */
1464                                         if (algo->cb_init != NULL)
1465                                                 if (algo->cb_init(tp->ccv) > 0) {
1466                                                         CC_ALGO(tp) = &newreno_cc_algo;
1467                                                         /*
1468                                                          * The only reason init
1469                                                          * should fail is
1470                                                          * because of malloc.
1471                                                          */
1472                                                         error = ENOMEM;
1473                                                 }
1474                                         break; /* Break the STAILQ_FOREACH. */
1475                                 }
1476                         }
1477                         CC_LIST_RUNLOCK();
1478                         goto unlock_and_done;
1479
1480                 case TCP_KEEPIDLE:
1481                 case TCP_KEEPINTVL:
1482                 case TCP_KEEPINIT:
1483                         INP_WUNLOCK(inp);
1484                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1485                         if (error)
1486                                 return (error);
1487
1488                         if (ui > (UINT_MAX / hz)) {
1489                                 error = EINVAL;
1490                                 break;
1491                         }
1492                         ui *= hz;
1493
1494                         INP_WLOCK_RECHECK(inp);
1495                         switch (sopt->sopt_name) {
1496                         case TCP_KEEPIDLE:
1497                                 tp->t_keepidle = ui;
1498                                 /*
1499                                  * XXX: better check current remaining
1500                                  * timeout and "merge" it with new value.
1501                                  */
1502                                 if ((tp->t_state > TCPS_LISTEN) &&
1503                                     (tp->t_state <= TCPS_CLOSING))
1504                                         tcp_timer_activate(tp, TT_KEEP,
1505                                             TP_KEEPIDLE(tp));
1506                                 break;
1507                         case TCP_KEEPINTVL:
1508                                 tp->t_keepintvl = ui;
1509                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1510                                     (TP_MAXIDLE(tp) > 0))
1511                                         tcp_timer_activate(tp, TT_2MSL,
1512                                             TP_MAXIDLE(tp));
1513                                 break;
1514                         case TCP_KEEPINIT:
1515                                 tp->t_keepinit = ui;
1516                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
1517                                     tp->t_state == TCPS_SYN_SENT)
1518                                         tcp_timer_activate(tp, TT_KEEP,
1519                                             TP_KEEPINIT(tp));
1520                                 break;
1521                         }
1522                         goto unlock_and_done;
1523
1524                 case TCP_KEEPCNT:
1525                         INP_WUNLOCK(inp);
1526                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1527                         if (error)
1528                                 return (error);
1529
1530                         INP_WLOCK_RECHECK(inp);
1531                         tp->t_keepcnt = ui;
1532                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1533                             (TP_MAXIDLE(tp) > 0))
1534                                 tcp_timer_activate(tp, TT_2MSL,
1535                                     TP_MAXIDLE(tp));
1536                         goto unlock_and_done;
1537
1538                 default:
1539                         INP_WUNLOCK(inp);
1540                         error = ENOPROTOOPT;
1541                         break;
1542                 }
1543                 break;
1544
1545         case SOPT_GET:
1546                 tp = intotcpcb(inp);
1547                 switch (sopt->sopt_name) {
1548 #ifdef TCP_SIGNATURE
1549                 case TCP_MD5SIG:
1550                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1551                         INP_WUNLOCK(inp);
1552                         error = sooptcopyout(sopt, &optval, sizeof optval);
1553                         break;
1554 #endif
1555
1556                 case TCP_NODELAY:
1557                         optval = tp->t_flags & TF_NODELAY;
1558                         INP_WUNLOCK(inp);
1559                         error = sooptcopyout(sopt, &optval, sizeof optval);
1560                         break;
1561                 case TCP_MAXSEG:
1562                         optval = tp->t_maxseg;
1563                         INP_WUNLOCK(inp);
1564                         error = sooptcopyout(sopt, &optval, sizeof optval);
1565                         break;
1566                 case TCP_NOOPT:
1567                         optval = tp->t_flags & TF_NOOPT;
1568                         INP_WUNLOCK(inp);
1569                         error = sooptcopyout(sopt, &optval, sizeof optval);
1570                         break;
1571                 case TCP_NOPUSH:
1572                         optval = tp->t_flags & TF_NOPUSH;
1573                         INP_WUNLOCK(inp);
1574                         error = sooptcopyout(sopt, &optval, sizeof optval);
1575                         break;
1576                 case TCP_INFO:
1577                         tcp_fill_info(tp, &ti);
1578                         INP_WUNLOCK(inp);
1579                         error = sooptcopyout(sopt, &ti, sizeof ti);
1580                         break;
1581                 case TCP_CONGESTION:
1582                         bzero(buf, sizeof(buf));
1583                         strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
1584                         INP_WUNLOCK(inp);
1585                         error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX);
1586                         break;
1587                 default:
1588                         INP_WUNLOCK(inp);
1589                         error = ENOPROTOOPT;
1590                         break;
1591                 }
1592                 break;
1593         }
1594         return (error);
1595 }
1596 #undef INP_WLOCK_RECHECK
1597
1598 /*
1599  * Attach TCP protocol to socket, allocating
1600  * internet protocol control block, tcp control block,
1601  * bufer space, and entering LISTEN state if to accept connections.
1602  */
1603 static int
1604 tcp_attach(struct socket *so)
1605 {
1606         struct tcpcb *tp;
1607         struct inpcb *inp;
1608         int error;
1609
1610         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1611                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
1612                 if (error)
1613                         return (error);
1614         }
1615         so->so_rcv.sb_flags |= SB_AUTOSIZE;
1616         so->so_snd.sb_flags |= SB_AUTOSIZE;
1617         INP_INFO_WLOCK(&V_tcbinfo);
1618         error = in_pcballoc(so, &V_tcbinfo);
1619         if (error) {
1620                 INP_INFO_WUNLOCK(&V_tcbinfo);
1621                 return (error);
1622         }
1623         inp = sotoinpcb(so);
1624 #ifdef INET6
1625         if (inp->inp_vflag & INP_IPV6PROTO) {
1626                 inp->inp_vflag |= INP_IPV6;
1627                 inp->in6p_hops = -1;    /* use kernel default */
1628         }
1629         else
1630 #endif
1631         inp->inp_vflag |= INP_IPV4;
1632         tp = tcp_newtcpcb(inp);
1633         if (tp == NULL) {
1634                 in_pcbdetach(inp);
1635                 in_pcbfree(inp);
1636                 INP_INFO_WUNLOCK(&V_tcbinfo);
1637                 return (ENOBUFS);
1638         }
1639         tp->t_state = TCPS_CLOSED;
1640         INP_WUNLOCK(inp);
1641         INP_INFO_WUNLOCK(&V_tcbinfo);
1642         return (0);
1643 }
1644
1645 /*
1646  * Initiate (or continue) disconnect.
1647  * If embryonic state, just send reset (once).
1648  * If in ``let data drain'' option and linger null, just drop.
1649  * Otherwise (hard), mark socket disconnecting and drop
1650  * current input data; switch states based on user close, and
1651  * send segment to peer (with FIN).
1652  */
1653 static void
1654 tcp_disconnect(struct tcpcb *tp)
1655 {
1656         struct inpcb *inp = tp->t_inpcb;
1657         struct socket *so = inp->inp_socket;
1658
1659         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1660         INP_WLOCK_ASSERT(inp);
1661
1662         /*
1663          * Neither tcp_close() nor tcp_drop() should return NULL, as the
1664          * socket is still open.
1665          */
1666         if (tp->t_state < TCPS_ESTABLISHED) {
1667                 tp = tcp_close(tp);
1668                 KASSERT(tp != NULL,
1669                     ("tcp_disconnect: tcp_close() returned NULL"));
1670         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1671                 tp = tcp_drop(tp, 0);
1672                 KASSERT(tp != NULL,
1673                     ("tcp_disconnect: tcp_drop() returned NULL"));
1674         } else {
1675                 soisdisconnecting(so);
1676                 sbflush(&so->so_rcv);
1677                 tcp_usrclosed(tp);
1678                 if (!(inp->inp_flags & INP_DROPPED))
1679                         tcp_output(tp);
1680         }
1681 }
1682
1683 /*
1684  * User issued close, and wish to trail through shutdown states:
1685  * if never received SYN, just forget it.  If got a SYN from peer,
1686  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1687  * If already got a FIN from peer, then almost done; go to LAST_ACK
1688  * state.  In all other cases, have already sent FIN to peer (e.g.
1689  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1690  * for peer to send FIN or not respond to keep-alives, etc.
1691  * We can let the user exit from the close as soon as the FIN is acked.
1692  */
1693 static void
1694 tcp_usrclosed(struct tcpcb *tp)
1695 {
1696
1697         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1698         INP_WLOCK_ASSERT(tp->t_inpcb);
1699
1700         switch (tp->t_state) {
1701         case TCPS_LISTEN:
1702 #ifdef TCP_OFFLOAD
1703                 tcp_offload_listen_stop(tp);
1704 #endif
1705                 /* FALLTHROUGH */
1706         case TCPS_CLOSED:
1707                 tcp_state_change(tp, TCPS_CLOSED);
1708                 tp = tcp_close(tp);
1709                 /*
1710                  * tcp_close() should never return NULL here as the socket is
1711                  * still open.
1712                  */
1713                 KASSERT(tp != NULL,
1714                     ("tcp_usrclosed: tcp_close() returned NULL"));
1715                 break;
1716
1717         case TCPS_SYN_SENT:
1718         case TCPS_SYN_RECEIVED:
1719                 tp->t_flags |= TF_NEEDFIN;
1720                 break;
1721
1722         case TCPS_ESTABLISHED:
1723                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
1724                 break;
1725
1726         case TCPS_CLOSE_WAIT:
1727                 tcp_state_change(tp, TCPS_LAST_ACK);
1728                 break;
1729         }
1730         if (tp->t_state >= TCPS_FIN_WAIT_2) {
1731                 soisdisconnected(tp->t_inpcb->inp_socket);
1732                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1733                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1734                         int timeout;
1735
1736                         timeout = (tcp_fast_finwait2_recycle) ?
1737                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
1738                         tcp_timer_activate(tp, TT_2MSL, timeout);
1739                 }
1740         }
1741 }
1742
1743 #ifdef DDB
1744 static void
1745 db_print_indent(int indent)
1746 {
1747         int i;
1748
1749         for (i = 0; i < indent; i++)
1750                 db_printf(" ");
1751 }
1752
1753 static void
1754 db_print_tstate(int t_state)
1755 {
1756
1757         switch (t_state) {
1758         case TCPS_CLOSED:
1759                 db_printf("TCPS_CLOSED");
1760                 return;
1761
1762         case TCPS_LISTEN:
1763                 db_printf("TCPS_LISTEN");
1764                 return;
1765
1766         case TCPS_SYN_SENT:
1767                 db_printf("TCPS_SYN_SENT");
1768                 return;
1769
1770         case TCPS_SYN_RECEIVED:
1771                 db_printf("TCPS_SYN_RECEIVED");
1772                 return;
1773
1774         case TCPS_ESTABLISHED:
1775                 db_printf("TCPS_ESTABLISHED");
1776                 return;
1777
1778         case TCPS_CLOSE_WAIT:
1779                 db_printf("TCPS_CLOSE_WAIT");
1780                 return;
1781
1782         case TCPS_FIN_WAIT_1:
1783                 db_printf("TCPS_FIN_WAIT_1");
1784                 return;
1785
1786         case TCPS_CLOSING:
1787                 db_printf("TCPS_CLOSING");
1788                 return;
1789
1790         case TCPS_LAST_ACK:
1791                 db_printf("TCPS_LAST_ACK");
1792                 return;
1793
1794         case TCPS_FIN_WAIT_2:
1795                 db_printf("TCPS_FIN_WAIT_2");
1796                 return;
1797
1798         case TCPS_TIME_WAIT:
1799                 db_printf("TCPS_TIME_WAIT");
1800                 return;
1801
1802         default:
1803                 db_printf("unknown");
1804                 return;
1805         }
1806 }
1807
1808 static void
1809 db_print_tflags(u_int t_flags)
1810 {
1811         int comma;
1812
1813         comma = 0;
1814         if (t_flags & TF_ACKNOW) {
1815                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1816                 comma = 1;
1817         }
1818         if (t_flags & TF_DELACK) {
1819                 db_printf("%sTF_DELACK", comma ? ", " : "");
1820                 comma = 1;
1821         }
1822         if (t_flags & TF_NODELAY) {
1823                 db_printf("%sTF_NODELAY", comma ? ", " : "");
1824                 comma = 1;
1825         }
1826         if (t_flags & TF_NOOPT) {
1827                 db_printf("%sTF_NOOPT", comma ? ", " : "");
1828                 comma = 1;
1829         }
1830         if (t_flags & TF_SENTFIN) {
1831                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1832                 comma = 1;
1833         }
1834         if (t_flags & TF_REQ_SCALE) {
1835                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1836                 comma = 1;
1837         }
1838         if (t_flags & TF_RCVD_SCALE) {
1839                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1840                 comma = 1;
1841         }
1842         if (t_flags & TF_REQ_TSTMP) {
1843                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1844                 comma = 1;
1845         }
1846         if (t_flags & TF_RCVD_TSTMP) {
1847                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1848                 comma = 1;
1849         }
1850         if (t_flags & TF_SACK_PERMIT) {
1851                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1852                 comma = 1;
1853         }
1854         if (t_flags & TF_NEEDSYN) {
1855                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1856                 comma = 1;
1857         }
1858         if (t_flags & TF_NEEDFIN) {
1859                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1860                 comma = 1;
1861         }
1862         if (t_flags & TF_NOPUSH) {
1863                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1864                 comma = 1;
1865         }
1866         if (t_flags & TF_MORETOCOME) {
1867                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1868                 comma = 1;
1869         }
1870         if (t_flags & TF_LQ_OVERFLOW) {
1871                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1872                 comma = 1;
1873         }
1874         if (t_flags & TF_LASTIDLE) {
1875                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1876                 comma = 1;
1877         }
1878         if (t_flags & TF_RXWIN0SENT) {
1879                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1880                 comma = 1;
1881         }
1882         if (t_flags & TF_FASTRECOVERY) {
1883                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1884                 comma = 1;
1885         }
1886         if (t_flags & TF_CONGRECOVERY) {
1887                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
1888                 comma = 1;
1889         }
1890         if (t_flags & TF_WASFRECOVERY) {
1891                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1892                 comma = 1;
1893         }
1894         if (t_flags & TF_SIGNATURE) {
1895                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1896                 comma = 1;
1897         }
1898         if (t_flags & TF_FORCEDATA) {
1899                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1900                 comma = 1;
1901         }
1902         if (t_flags & TF_TSO) {
1903                 db_printf("%sTF_TSO", comma ? ", " : "");
1904                 comma = 1;
1905         }
1906         if (t_flags & TF_ECN_PERMIT) {
1907                 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
1908                 comma = 1;
1909         }
1910 }
1911
1912 static void
1913 db_print_toobflags(char t_oobflags)
1914 {
1915         int comma;
1916
1917         comma = 0;
1918         if (t_oobflags & TCPOOB_HAVEDATA) {
1919                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1920                 comma = 1;
1921         }
1922         if (t_oobflags & TCPOOB_HADDATA) {
1923                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1924                 comma = 1;
1925         }
1926 }
1927
1928 static void
1929 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1930 {
1931
1932         db_print_indent(indent);
1933         db_printf("%s at %p\n", name, tp);
1934
1935         indent += 2;
1936
1937         db_print_indent(indent);
1938         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
1939            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1940
1941         db_print_indent(indent);
1942         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
1943             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1944
1945         db_print_indent(indent);
1946         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1947             &tp->t_timers->tt_delack, tp->t_inpcb);
1948
1949         db_print_indent(indent);
1950         db_printf("t_state: %d (", tp->t_state);
1951         db_print_tstate(tp->t_state);
1952         db_printf(")\n");
1953
1954         db_print_indent(indent);
1955         db_printf("t_flags: 0x%x (", tp->t_flags);
1956         db_print_tflags(tp->t_flags);
1957         db_printf(")\n");
1958
1959         db_print_indent(indent);
1960         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
1961             tp->snd_una, tp->snd_max, tp->snd_nxt);
1962
1963         db_print_indent(indent);
1964         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
1965            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1966
1967         db_print_indent(indent);
1968         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
1969             tp->iss, tp->irs, tp->rcv_nxt);
1970
1971         db_print_indent(indent);
1972         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
1973             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1974
1975         db_print_indent(indent);
1976         db_printf("snd_wnd: %lu   snd_cwnd: %lu\n",
1977            tp->snd_wnd, tp->snd_cwnd);
1978
1979         db_print_indent(indent);
1980         db_printf("snd_ssthresh: %lu   snd_recover: "
1981             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
1982
1983         db_print_indent(indent);
1984         db_printf("t_maxopd: %u   t_rcvtime: %u   t_startime: %u\n",
1985             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1986
1987         db_print_indent(indent);
1988         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
1989             tp->t_rtttime, tp->t_rtseq);
1990
1991         db_print_indent(indent);
1992         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
1993             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
1994
1995         db_print_indent(indent);
1996         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
1997             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
1998             tp->t_rttbest);
1999
2000         db_print_indent(indent);
2001         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
2002             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2003
2004         db_print_indent(indent);
2005         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2006         db_print_toobflags(tp->t_oobflags);
2007         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
2008
2009         db_print_indent(indent);
2010         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
2011             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2012
2013         db_print_indent(indent);
2014         db_printf("ts_recent: %u   ts_recent_age: %u\n",
2015             tp->ts_recent, tp->ts_recent_age);
2016
2017         db_print_indent(indent);
2018         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
2019             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2020
2021         db_print_indent(indent);
2022         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
2023             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2024             tp->snd_recover_prev, tp->t_badrxtwin);
2025
2026         db_print_indent(indent);
2027         db_printf("snd_numholes: %d  snd_holes first: %p\n",
2028             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2029
2030         db_print_indent(indent);
2031         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
2032             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
2033
2034         /* Skip sackblks, sackhint. */
2035
2036         db_print_indent(indent);
2037         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
2038             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2039 }
2040
2041 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2042 {
2043         struct tcpcb *tp;
2044
2045         if (!have_addr) {
2046                 db_printf("usage: show tcpcb <addr>\n");
2047                 return;
2048         }
2049         tp = (struct tcpcb *)addr;
2050
2051         db_print_tcpcb(tp, "tcpcb", 0);
2052 }
2053 #endif