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/if_var.h>
  68 #include <net/route.h>
  69 #include <net/vnet.h>
  70
  71 #include <netinet/cc.h>
  72 #include <netinet/in.h>
  73 #include <netinet/in_pcb.h>
  74 #include <netinet/in_systm.h>
  75 #include <netinet/in_var.h>
  76 #include <netinet/ip_var.h>
  77 #ifdef INET6
  78 #include <netinet/ip6.h>
  79 #include <netinet6/in6_pcb.h>
  80 #include <netinet6/ip6_var.h>
  81 #include <netinet6/scope6_var.h>
  82 #endif
  83 #include <netinet/tcp_fsm.h>
  84 #include <netinet/tcp_seq.h>
  85 #include <netinet/tcp_timer.h>
  86 #include <netinet/tcp_var.h>
  87 #include <netinet/tcpip.h>
  88 #ifdef TCPDEBUG
  89 #include <netinet/tcp_debug.h>
  90 #endif
  91 #ifdef TCP_OFFLOAD
  92 #include <netinet/tcp_offload.h>
  93 #endif
  94
  95 /*
  96  * TCP protocol interface to socket abstraction.
  97  */
  98 static int      tcp_attach(struct socket *);
  99 #ifdef INET
 100 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
 101                     struct thread *td);
 102 #endif /* INET */
 103 #ifdef INET6
 104 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
 105                     struct thread *td);
 106 #endif /* INET6 */
 107 static void     tcp_disconnect(struct tcpcb *);
 108 static void     tcp_usrclosed(struct tcpcb *);
 109 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
 110
 111 #ifdef TCPDEBUG
 112 #define TCPDEBUG0       int ostate = 0
 113 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
 114 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
 115                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
 116 #else
 117 #define TCPDEBUG0
 118 #define TCPDEBUG1()
 119 #define TCPDEBUG2(req)
 120 #endif
 121
 122 /*
 123  * TCP attaches to socket via pru_attach(), reserving space,
 124  * and an internet control block.
 125  */
 126 static int
 127 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
 128 {
 129         struct inpcb *inp;
 130         struct tcpcb *tp = NULL;
 131         int error;
 132         TCPDEBUG0;
 133
 134         inp = sotoinpcb(so);
 135         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
 136         TCPDEBUG1();
 137
 138         error = tcp_attach(so);
 139         if (error)
 140                 goto out;
 141
 142         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
 143                 so->so_linger = TCP_LINGERTIME;
 144
 145         inp = sotoinpcb(so);
 146         tp = intotcpcb(inp);
 147 out:
 148         TCPDEBUG2(PRU_ATTACH);
 149         return error;
 150 }
 151
 152 /*
 153  * tcp_detach is called when the socket layer loses its final reference
 154  * to the socket, be it a file descriptor reference, a reference from TCP,
 155  * etc.  At this point, there is only one case in which we will keep around
 156  * inpcb state: time wait.
 157  *
 158  * This function can probably be re-absorbed back into tcp_usr_detach() now
 159  * that there is a single detach path.
 160  */
 161 static void
 162 tcp_detach(struct socket *so, struct inpcb *inp)
 163 {
 164         struct tcpcb *tp;
 165
 166         INP_INFO_LOCK_ASSERT(&V_tcbinfo);
 167         INP_WLOCK_ASSERT(inp);
 168
 169         KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
 170         KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
 171
 172         tp = intotcpcb(inp);
 173
 174         if (inp->inp_flags & INP_TIMEWAIT) {
 175                 /*
 176                  * There are two cases to handle: one in which the time wait
 177                  * state is being discarded (INP_DROPPED), and one in which
 178                  * this connection will remain in timewait.  In the former,
 179                  * it is time to discard all state (except tcptw, which has
 180                  * already been discarded by the timewait close code, which
 181                  * should be further up the call stack somewhere).  In the
 182                  * latter case, we detach from the socket, but leave the pcb
 183                  * present until timewait ends.
 184                  *
 185                  * XXXRW: Would it be cleaner to free the tcptw here?
 186                  *
 187                  * Astute question indeed, from twtcp perspective there are
 188                  * three cases to consider:
 189                  *
 190                  * #1 tcp_detach is called at tcptw creation time by
 191                  *  tcp_twstart, then do not discard the newly created tcptw
 192                  *  and leave inpcb present until timewait ends
 193                  * #2 tcp_detach is called at timewait end (or reuse) by
 194                  *  tcp_twclose, then the tcptw has already been discarded
 195                  *  (or reused) and inpcb is freed here
 196                  * #3 tcp_detach is called() after timewait ends (or reuse)
 197                  *  (e.g. by soclose), then tcptw has already been discarded
 198                  *  (or reused) and inpcb is freed here
 199                  *
 200                  *  In all three cases the tcptw should not be freed here.
 201                  */
 202                 if (inp->inp_flags & INP_DROPPED) {
 203                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 204                             "INP_DROPPED && tp != NULL"));
 205                         in_pcbdetach(inp);
 206                         in_pcbfree(inp);
 207                 } else {
 208                         in_pcbdetach(inp);
 209                         INP_WUNLOCK(inp);
 210                 }
 211         } else {
 212                 /*
 213                  * If the connection is not in timewait, we consider two
 214                  * two conditions: one in which no further processing is
 215                  * necessary (dropped || embryonic), and one in which TCP is
 216                  * not yet done, but no longer requires the socket, so the
 217                  * pcb will persist for the time being.
 218                  *
 219                  * XXXRW: Does the second case still occur?
 220                  */
 221                 if (inp->inp_flags & INP_DROPPED ||
 222                     tp->t_state < TCPS_SYN_SENT) {
 223                         tcp_discardcb(tp);
 224                         in_pcbdetach(inp);
 225                         in_pcbfree(inp);
 226                 } else {
 227                         in_pcbdetach(inp);
 228                         INP_WUNLOCK(inp);
 229                 }
 230         }
 231 }
 232
 233 /*
 234  * pru_detach() detaches the TCP protocol from the socket.
 235  * If the protocol state is non-embryonic, then can't
 236  * do this directly: have to initiate a pru_disconnect(),
 237  * which may finish later; embryonic TCB's can just
 238  * be discarded here.
 239  */
 240 static void
 241 tcp_usr_detach(struct socket *so)
 242 {
 243         struct inpcb *inp;
 244         int rlock = 0;
 245
 246         inp = sotoinpcb(so);
 247         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
 248         if (!INP_INFO_WLOCKED(&V_tcbinfo)) {
 249                 INP_INFO_RLOCK(&V_tcbinfo);
 250                 rlock = 1;
 251         }
 252         INP_WLOCK(inp);
 253         KASSERT(inp->inp_socket != NULL,
 254             ("tcp_usr_detach: inp_socket == NULL"));
 255         tcp_detach(so, inp);
 256         if (rlock)
 257                 INP_INFO_RUNLOCK(&V_tcbinfo);
 258 }
 259
 260 #ifdef INET
 261 /*
 262  * Give the socket an address.
 263  */
 264 static int
 265 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 266 {
 267         int error = 0;
 268         struct inpcb *inp;
 269         struct tcpcb *tp = NULL;
 270         struct sockaddr_in *sinp;
 271
 272         sinp = (struct sockaddr_in *)nam;
 273         if (nam->sa_len != sizeof (*sinp))
 274                 return (EINVAL);
 275         /*
 276          * Must check for multicast addresses and disallow binding
 277          * to them.
 278          */
 279         if (sinp->sin_family == AF_INET &&
 280             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 281                 return (EAFNOSUPPORT);
 282
 283         TCPDEBUG0;
 284         inp = sotoinpcb(so);
 285         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 286         INP_WLOCK(inp);
 287         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 288                 error = EINVAL;
 289                 goto out;
 290         }
 291         tp = intotcpcb(inp);
 292         TCPDEBUG1();
 293         INP_HASH_WLOCK(&V_tcbinfo);
 294         error = in_pcbbind(inp, nam, td->td_ucred);
 295         INP_HASH_WUNLOCK(&V_tcbinfo);
 296 out:
 297         TCPDEBUG2(PRU_BIND);
 298         INP_WUNLOCK(inp);
 299
 300         return (error);
 301 }
 302 #endif /* INET */
 303
 304 #ifdef INET6
 305 static int
 306 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 307 {
 308         int error = 0;
 309         struct inpcb *inp;
 310         struct tcpcb *tp = NULL;
 311         struct sockaddr_in6 *sin6p;
 312
 313         sin6p = (struct sockaddr_in6 *)nam;
 314         if (nam->sa_len != sizeof (*sin6p))
 315                 return (EINVAL);
 316         /*
 317          * Must check for multicast addresses and disallow binding
 318          * to them.
 319          */
 320         if (sin6p->sin6_family == AF_INET6 &&
 321             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 322                 return (EAFNOSUPPORT);
 323
 324         TCPDEBUG0;
 325         inp = sotoinpcb(so);
 326         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 327         INP_WLOCK(inp);
 328         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 329                 error = EINVAL;
 330                 goto out;
 331         }
 332         tp = intotcpcb(inp);
 333         TCPDEBUG1();
 334         INP_HASH_WLOCK(&V_tcbinfo);
 335         inp->inp_vflag &= ~INP_IPV4;
 336         inp->inp_vflag |= INP_IPV6;
 337 #ifdef INET
 338         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 339                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 340                         inp->inp_vflag |= INP_IPV4;
 341                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 342                         struct sockaddr_in sin;
 343
 344                         in6_sin6_2_sin(&sin, sin6p);
 345                         inp->inp_vflag |= INP_IPV4;
 346                         inp->inp_vflag &= ~INP_IPV6;
 347                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 348                             td->td_ucred);
 349                         INP_HASH_WUNLOCK(&V_tcbinfo);
 350                         goto out;
 351                 }
 352         }
 353 #endif
 354         error = in6_pcbbind(inp, nam, td->td_ucred);
 355         INP_HASH_WUNLOCK(&V_tcbinfo);
 356 out:
 357         TCPDEBUG2(PRU_BIND);
 358         INP_WUNLOCK(inp);
 359         return (error);
 360 }
 361 #endif /* INET6 */
 362
 363 #ifdef INET
 364 /*
 365  * Prepare to accept connections.
 366  */
 367 static int
 368 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 369 {
 370         int error = 0;
 371         struct inpcb *inp;
 372         struct tcpcb *tp = NULL;
 373
 374         TCPDEBUG0;
 375         inp = sotoinpcb(so);
 376         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 377         INP_WLOCK(inp);
 378         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 379                 error = EINVAL;
 380                 goto out;
 381         }
 382         tp = intotcpcb(inp);
 383         TCPDEBUG1();
 384         SOCK_LOCK(so);
 385         error = solisten_proto_check(so);
 386         INP_HASH_WLOCK(&V_tcbinfo);
 387         if (error == 0 && inp->inp_lport == 0)
 388                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 389         INP_HASH_WUNLOCK(&V_tcbinfo);
 390         if (error == 0) {
 391                 tcp_state_change(tp, TCPS_LISTEN);
 392                 solisten_proto(so, backlog);
 393 #ifdef TCP_OFFLOAD
 394                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 395                         tcp_offload_listen_start(tp);
 396 #endif
 397         }
 398         SOCK_UNLOCK(so);
 399
 400 out:
 401         TCPDEBUG2(PRU_LISTEN);
 402         INP_WUNLOCK(inp);
 403         return (error);
 404 }
 405 #endif /* INET */
 406
 407 #ifdef INET6
 408 static int
 409 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 410 {
 411         int error = 0;
 412         struct inpcb *inp;
 413         struct tcpcb *tp = NULL;
 414
 415         TCPDEBUG0;
 416         inp = sotoinpcb(so);
 417         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 418         INP_WLOCK(inp);
 419         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 420                 error = EINVAL;
 421                 goto out;
 422         }
 423         tp = intotcpcb(inp);
 424         TCPDEBUG1();
 425         SOCK_LOCK(so);
 426         error = solisten_proto_check(so);
 427         INP_HASH_WLOCK(&V_tcbinfo);
 428         if (error == 0 && inp->inp_lport == 0) {
 429                 inp->inp_vflag &= ~INP_IPV4;
 430                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 431                         inp->inp_vflag |= INP_IPV4;
 432                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 433         }
 434         INP_HASH_WUNLOCK(&V_tcbinfo);
 435         if (error == 0) {
 436                 tcp_state_change(tp, TCPS_LISTEN);
 437                 solisten_proto(so, backlog);
 438 #ifdef TCP_OFFLOAD
 439                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 440                         tcp_offload_listen_start(tp);
 441 #endif
 442         }
 443         SOCK_UNLOCK(so);
 444
 445 out:
 446         TCPDEBUG2(PRU_LISTEN);
 447         INP_WUNLOCK(inp);
 448         return (error);
 449 }
 450 #endif /* INET6 */
 451
 452 #ifdef INET
 453 /*
 454  * Initiate connection to peer.
 455  * Create a template for use in transmissions on this connection.
 456  * Enter SYN_SENT state, and mark socket as connecting.
 457  * Start keep-alive timer, and seed output sequence space.
 458  * Send initial segment on connection.
 459  */
 460 static int
 461 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 462 {
 463         int error = 0;
 464         struct inpcb *inp;
 465         struct tcpcb *tp = NULL;
 466         struct sockaddr_in *sinp;
 467
 468         sinp = (struct sockaddr_in *)nam;
 469         if (nam->sa_len != sizeof (*sinp))
 470                 return (EINVAL);
 471         /*
 472          * Must disallow TCP ``connections'' to multicast addresses.
 473          */
 474         if (sinp->sin_family == AF_INET
 475             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 476                 return (EAFNOSUPPORT);
 477         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 478                 return (error);
 479
 480         TCPDEBUG0;
 481         inp = sotoinpcb(so);
 482         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 483         INP_WLOCK(inp);
 484         if (inp->inp_flags & INP_TIMEWAIT) {
 485                 error = EADDRINUSE;
 486                 goto out;
 487         }
 488         if (inp->inp_flags & INP_DROPPED) {
 489                 error = ECONNREFUSED;
 490                 goto out;
 491         }
 492         tp = intotcpcb(inp);
 493         TCPDEBUG1();
 494         if ((error = tcp_connect(tp, nam, td)) != 0)
 495                 goto out;
 496 #ifdef TCP_OFFLOAD
 497         if (registered_toedevs > 0 &&
 498             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 499             (error = tcp_offload_connect(so, nam)) == 0)
 500                 goto out;
 501 #endif
 502         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 503         error = tcp_output(tp);
 504 out:
 505         TCPDEBUG2(PRU_CONNECT);
 506         INP_WUNLOCK(inp);
 507         return (error);
 508 }
 509 #endif /* INET */
 510
 511 #ifdef INET6
 512 static int
 513 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 514 {
 515         int error = 0;
 516         struct inpcb *inp;
 517         struct tcpcb *tp = NULL;
 518         struct sockaddr_in6 *sin6p;
 519
 520         TCPDEBUG0;
 521
 522         sin6p = (struct sockaddr_in6 *)nam;
 523         if (nam->sa_len != sizeof (*sin6p))
 524                 return (EINVAL);
 525         /*
 526          * Must disallow TCP ``connections'' to multicast addresses.
 527          */
 528         if (sin6p->sin6_family == AF_INET6
 529             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 530                 return (EAFNOSUPPORT);
 531
 532         inp = sotoinpcb(so);
 533         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 534         INP_WLOCK(inp);
 535         if (inp->inp_flags & INP_TIMEWAIT) {
 536                 error = EADDRINUSE;
 537                 goto out;
 538         }
 539         if (inp->inp_flags & INP_DROPPED) {
 540                 error = ECONNREFUSED;
 541                 goto out;
 542         }
 543         tp = intotcpcb(inp);
 544         TCPDEBUG1();
 545 #ifdef INET
 546         /*
 547          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 548          * therefore probably require the hash lock, which isn't held here.
 549          * Is this a significant problem?
 550          */
 551         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 552                 struct sockaddr_in sin;
 553
 554                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 555                         error = EINVAL;
 556                         goto out;
 557                 }
 558
 559                 in6_sin6_2_sin(&sin, sin6p);
 560                 inp->inp_vflag |= INP_IPV4;
 561                 inp->inp_vflag &= ~INP_IPV6;
 562                 if ((error = prison_remote_ip4(td->td_ucred,
 563                     &sin.sin_addr)) != 0)
 564                         goto out;
 565                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 566                         goto out;
 567 #ifdef TCP_OFFLOAD
 568                 if (registered_toedevs > 0 &&
 569                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 570                     (error = tcp_offload_connect(so, nam)) == 0)
 571                         goto out;
 572 #endif
 573                 error = tcp_output(tp);
 574                 goto out;
 575         }
 576 #endif
 577         inp->inp_vflag &= ~INP_IPV4;
 578         inp->inp_vflag |= INP_IPV6;
 579         inp->inp_inc.inc_flags |= INC_ISIPV6;
 580         if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
 581                 goto out;
 582         if ((error = tcp6_connect(tp, nam, td)) != 0)
 583                 goto out;
 584 #ifdef TCP_OFFLOAD
 585         if (registered_toedevs > 0 &&
 586             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 587             (error = tcp_offload_connect(so, nam)) == 0)
 588                 goto out;
 589 #endif
 590         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 591         error = tcp_output(tp);
 592
 593 out:
 594         TCPDEBUG2(PRU_CONNECT);
 595         INP_WUNLOCK(inp);
 596         return (error);
 597 }
 598 #endif /* INET6 */
 599
 600 /*
 601  * Initiate disconnect from peer.
 602  * If connection never passed embryonic stage, just drop;
 603  * else if don't need to let data drain, then can just drop anyways,
 604  * else have to begin TCP shutdown process: mark socket disconnecting,
 605  * drain unread data, state switch to reflect user close, and
 606  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 607  * when peer sends FIN and acks ours.
 608  *
 609  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 610  */
 611 static int
 612 tcp_usr_disconnect(struct socket *so)
 613 {
 614         struct inpcb *inp;
 615         struct tcpcb *tp = NULL;
 616         int error = 0;
 617
 618         TCPDEBUG0;
 619         INP_INFO_RLOCK(&V_tcbinfo);
 620         inp = sotoinpcb(so);
 621         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 622         INP_WLOCK(inp);
 623         if (inp->inp_flags & INP_TIMEWAIT)
 624                 goto out;
 625         if (inp->inp_flags & INP_DROPPED) {
 626                 error = ECONNRESET;
 627                 goto out;
 628         }
 629         tp = intotcpcb(inp);
 630         TCPDEBUG1();
 631         tcp_disconnect(tp);
 632 out:
 633         TCPDEBUG2(PRU_DISCONNECT);
 634         INP_WUNLOCK(inp);
 635         INP_INFO_RUNLOCK(&V_tcbinfo);
 636         return (error);
 637 }
 638
 639 #ifdef INET
 640 /*
 641  * Accept a connection.  Essentially all the work is done at higher levels;
 642  * just return the address of the peer, storing through addr.
 643  */
 644 static int
 645 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 646 {
 647         int error = 0;
 648         struct inpcb *inp = NULL;
 649         struct tcpcb *tp = NULL;
 650         struct in_addr addr;
 651         in_port_t port = 0;
 652         TCPDEBUG0;
 653
 654         if (so->so_state & SS_ISDISCONNECTED)
 655                 return (ECONNABORTED);
 656
 657         inp = sotoinpcb(so);
 658         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 659         INP_WLOCK(inp);
 660         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 661                 error = ECONNABORTED;
 662                 goto out;
 663         }
 664         tp = intotcpcb(inp);
 665         TCPDEBUG1();
 666
 667         /*
 668          * We inline in_getpeeraddr and COMMON_END here, so that we can
 669          * copy the data of interest and defer the malloc until after we
 670          * release the lock.
 671          */
 672         port = inp->inp_fport;
 673         addr = inp->inp_faddr;
 674
 675 out:
 676         TCPDEBUG2(PRU_ACCEPT);
 677         INP_WUNLOCK(inp);
 678         if (error == 0)
 679                 *nam = in_sockaddr(port, &addr);
 680         return error;
 681 }
 682 #endif /* INET */
 683
 684 #ifdef INET6
 685 static int
 686 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 687 {
 688         struct inpcb *inp = NULL;
 689         int error = 0;
 690         struct tcpcb *tp = NULL;
 691         struct in_addr addr;
 692         struct in6_addr addr6;
 693         in_port_t port = 0;
 694         int v4 = 0;
 695         TCPDEBUG0;
 696
 697         if (so->so_state & SS_ISDISCONNECTED)
 698                 return (ECONNABORTED);
 699
 700         inp = sotoinpcb(so);
 701         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 702         INP_INFO_RLOCK(&V_tcbinfo);
 703         INP_WLOCK(inp);
 704         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 705                 error = ECONNABORTED;
 706                 goto out;
 707         }
 708         tp = intotcpcb(inp);
 709         TCPDEBUG1();
 710
 711         /*
 712          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 713          * copy the data of interest and defer the malloc until after we
 714          * release the lock.
 715          */
 716         if (inp->inp_vflag & INP_IPV4) {
 717                 v4 = 1;
 718                 port = inp->inp_fport;
 719                 addr = inp->inp_faddr;
 720         } else {
 721                 port = inp->inp_fport;
 722                 addr6 = inp->in6p_faddr;
 723         }
 724
 725 out:
 726         TCPDEBUG2(PRU_ACCEPT);
 727         INP_WUNLOCK(inp);
 728         INP_INFO_RUNLOCK(&V_tcbinfo);
 729         if (error == 0) {
 730                 if (v4)
 731                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 732                 else
 733                         *nam = in6_sockaddr(port, &addr6);
 734         }
 735         return error;
 736 }
 737 #endif /* INET6 */
 738
 739 /*
 740  * Mark the connection as being incapable of further output.
 741  */
 742 static int
 743 tcp_usr_shutdown(struct socket *so)
 744 {
 745         int error = 0;
 746         struct inpcb *inp;
 747         struct tcpcb *tp = NULL;
 748
 749         TCPDEBUG0;
 750         INP_INFO_RLOCK(&V_tcbinfo);
 751         inp = sotoinpcb(so);
 752         KASSERT(inp != NULL, ("inp == NULL"));
 753         INP_WLOCK(inp);
 754         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 755                 error = ECONNRESET;
 756                 goto out;
 757         }
 758         tp = intotcpcb(inp);
 759         TCPDEBUG1();
 760         socantsendmore(so);
 761         tcp_usrclosed(tp);
 762         if (!(inp->inp_flags & INP_DROPPED))
 763                 error = tcp_output(tp);
 764
 765 out:
 766         TCPDEBUG2(PRU_SHUTDOWN);
 767         INP_WUNLOCK(inp);
 768         INP_INFO_RUNLOCK(&V_tcbinfo);
 769
 770         return (error);
 771 }
 772
 773 /*
 774  * After a receive, possibly send window update to peer.
 775  */
 776 static int
 777 tcp_usr_rcvd(struct socket *so, int flags)
 778 {
 779         struct inpcb *inp;
 780         struct tcpcb *tp = NULL;
 781         int error = 0;
 782
 783         TCPDEBUG0;
 784         inp = sotoinpcb(so);
 785         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 786         INP_WLOCK(inp);
 787         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 788                 error = ECONNRESET;
 789                 goto out;
 790         }
 791         tp = intotcpcb(inp);
 792         TCPDEBUG1();
 793 #ifdef TCP_OFFLOAD
 794         if (tp->t_flags & TF_TOE)
 795                 tcp_offload_rcvd(tp);
 796         else
 797 #endif
 798         tcp_output(tp);
 799
 800 out:
 801         TCPDEBUG2(PRU_RCVD);
 802         INP_WUNLOCK(inp);
 803         return (error);
 804 }
 805
 806 /*
 807  * Do a send by putting data in output queue and updating urgent
 808  * marker if URG set.  Possibly send more data.  Unlike the other
 809  * pru_*() routines, the mbuf chains are our responsibility.  We
 810  * must either enqueue them or free them.  The other pru_* routines
 811  * generally are caller-frees.
 812  */
 813 static int
 814 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 815     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 816 {
 817         int error = 0;
 818         struct inpcb *inp;
 819         struct tcpcb *tp = NULL;
 820 #ifdef INET6
 821         int isipv6;
 822 #endif
 823         TCPDEBUG0;
 824
 825         /*
 826          * We require the pcbinfo lock if we will close the socket as part of
 827          * this call.
 828          */
 829         if (flags & PRUS_EOF)
 830                 INP_INFO_RLOCK(&V_tcbinfo);
 831         inp = sotoinpcb(so);
 832         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 833         INP_WLOCK(inp);
 834         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 835                 if (control)
 836                         m_freem(control);
 837                 /*
 838                  * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible
 839                  * for freeing memory.
 840                  */
 841                 if (m && (flags & PRUS_NOTREADY) == 0)
 842                         m_freem(m);
 843                 error = ECONNRESET;
 844                 goto out;
 845         }
 846 #ifdef INET6
 847         isipv6 = nam && nam->sa_family == AF_INET6;
 848 #endif /* INET6 */
 849         tp = intotcpcb(inp);
 850         TCPDEBUG1();
 851         if (control) {
 852                 /* TCP doesn't do control messages (rights, creds, etc) */
 853                 if (control->m_len) {
 854                         m_freem(control);
 855                         if (m)
 856                                 m_freem(m);
 857                         error = EINVAL;
 858                         goto out;
 859                 }
 860                 m_freem(control);       /* empty control, just free it */
 861         }
 862         if (!(flags & PRUS_OOB)) {
 863                 sbappendstream(&so->so_snd, m, flags);
 864                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 865                         /*
 866                          * Do implied connect if not yet connected,
 867                          * initialize window to default value, and
 868                          * initialize maxseg/maxopd using peer's cached
 869                          * MSS.
 870                          */
 871 #ifdef INET6
 872                         if (isipv6)
 873                                 error = tcp6_connect(tp, nam, td);
 874 #endif /* INET6 */
 875 #if defined(INET6) && defined(INET)
 876                         else
 877 #endif
 878 #ifdef INET
 879                                 error = tcp_connect(tp, nam, td);
 880 #endif
 881                         if (error)
 882                                 goto out;
 883                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 884                         tcp_mss(tp, -1);
 885                 }
 886                 if (flags & PRUS_EOF) {
 887                         /*
 888                          * Close the send side of the connection after
 889                          * the data is sent.
 890                          */
 891                         INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
 892                         socantsendmore(so);
 893                         tcp_usrclosed(tp);
 894                 }
 895                 if (!(inp->inp_flags & INP_DROPPED) &&
 896                     !(flags & PRUS_NOTREADY)) {
 897                         if (flags & PRUS_MORETOCOME)
 898                                 tp->t_flags |= TF_MORETOCOME;
 899                         error = tcp_output(tp);
 900                         if (flags & PRUS_MORETOCOME)
 901                                 tp->t_flags &= ~TF_MORETOCOME;
 902                 }
 903         } else {
 904                 /*
 905                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 906                  */
 907                 SOCKBUF_LOCK(&so->so_snd);
 908                 if (sbspace(&so->so_snd) < -512) {
 909                         SOCKBUF_UNLOCK(&so->so_snd);
 910                         m_freem(m);
 911                         error = ENOBUFS;
 912                         goto out;
 913                 }
 914                 /*
 915                  * According to RFC961 (Assigned Protocols),
 916                  * the urgent pointer points to the last octet
 917                  * of urgent data.  We continue, however,
 918                  * to consider it to indicate the first octet
 919                  * of data past the urgent section.
 920                  * Otherwise, snd_up should be one lower.
 921                  */
 922                 sbappendstream_locked(&so->so_snd, m, flags);
 923                 SOCKBUF_UNLOCK(&so->so_snd);
 924                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 925                         /*
 926                          * Do implied connect if not yet connected,
 927                          * initialize window to default value, and
 928                          * initialize maxseg/maxopd using peer's cached
 929                          * MSS.
 930                          */
 931 #ifdef INET6
 932                         if (isipv6)
 933                                 error = tcp6_connect(tp, nam, td);
 934 #endif /* INET6 */
 935 #if defined(INET6) && defined(INET)
 936                         else
 937 #endif
 938 #ifdef INET
 939                                 error = tcp_connect(tp, nam, td);
 940 #endif
 941                         if (error)
 942                                 goto out;
 943                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 944                         tcp_mss(tp, -1);
 945                 }
 946                 tp->snd_up = tp->snd_una + sbavail(&so->so_snd);
 947                 if (!(flags & PRUS_NOTREADY)) {
 948                         tp->t_flags |= TF_FORCEDATA;
 949                         error = tcp_output(tp);
 950                         tp->t_flags &= ~TF_FORCEDATA;
 951                 }
 952         }
 953 out:
 954         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
 955                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 956         INP_WUNLOCK(inp);
 957         if (flags & PRUS_EOF)
 958                 INP_INFO_RUNLOCK(&V_tcbinfo);
 959         return (error);
 960 }
 961
 962 static int
 963 tcp_usr_ready(struct socket *so, struct mbuf *m, int count)
 964 {
 965         struct inpcb *inp;
 966         struct tcpcb *tp;
 967         int error;
 968
 969         inp = sotoinpcb(so);
 970         INP_WLOCK(inp);
 971         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 972                 INP_WUNLOCK(inp);
 973                 for (int i = 0; i < count; i++)
 974                         m = m_free(m);
 975                 return (ECONNRESET);
 976         }
 977         tp = intotcpcb(inp);
 978
 979         SOCKBUF_LOCK(&so->so_snd);
 980         error = sbready(&so->so_snd, m, count);
 981         SOCKBUF_UNLOCK(&so->so_snd);
 982         if (error == 0)
 983                 error = tcp_output(tp);
 984         INP_WUNLOCK(inp);
 985
 986         return (error);
 987 }
 988
 989 /*
 990  * Abort the TCP.  Drop the connection abruptly.
 991  */
 992 static void
 993 tcp_usr_abort(struct socket *so)
 994 {
 995         struct inpcb *inp;
 996         struct tcpcb *tp = NULL;
 997         TCPDEBUG0;
 998
 999         inp = sotoinpcb(so);
1000         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
1001
1002         INP_INFO_RLOCK(&V_tcbinfo);
1003         INP_WLOCK(inp);
1004         KASSERT(inp->inp_socket != NULL,
1005             ("tcp_usr_abort: inp_socket == NULL"));
1006
1007         /*
1008          * If we still have full TCP state, and we're not dropped, drop.
1009          */
1010         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1011             !(inp->inp_flags & INP_DROPPED)) {
1012                 tp = intotcpcb(inp);
1013                 TCPDEBUG1();
1014                 tcp_drop(tp, ECONNABORTED);
1015                 TCPDEBUG2(PRU_ABORT);
1016         }
1017         if (!(inp->inp_flags & INP_DROPPED)) {
1018                 SOCK_LOCK(so);
1019                 so->so_state |= SS_PROTOREF;
1020                 SOCK_UNLOCK(so);
1021                 inp->inp_flags |= INP_SOCKREF;
1022         }
1023         INP_WUNLOCK(inp);
1024         INP_INFO_RUNLOCK(&V_tcbinfo);
1025 }
1026
1027 /*
1028  * TCP socket is closed.  Start friendly disconnect.
1029  */
1030 static void
1031 tcp_usr_close(struct socket *so)
1032 {
1033         struct inpcb *inp;
1034         struct tcpcb *tp = NULL;
1035         TCPDEBUG0;
1036
1037         inp = sotoinpcb(so);
1038         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
1039
1040         INP_INFO_RLOCK(&V_tcbinfo);
1041         INP_WLOCK(inp);
1042         KASSERT(inp->inp_socket != NULL,
1043             ("tcp_usr_close: inp_socket == NULL"));
1044
1045         /*
1046          * If we still have full TCP state, and we're not dropped, initiate
1047          * a disconnect.
1048          */
1049         if (!(inp->inp_flags & INP_TIMEWAIT) &&
1050             !(inp->inp_flags & INP_DROPPED)) {
1051                 tp = intotcpcb(inp);
1052                 TCPDEBUG1();
1053                 tcp_disconnect(tp);
1054                 TCPDEBUG2(PRU_CLOSE);
1055         }
1056         if (!(inp->inp_flags & INP_DROPPED)) {
1057                 SOCK_LOCK(so);
1058                 so->so_state |= SS_PROTOREF;
1059                 SOCK_UNLOCK(so);
1060                 inp->inp_flags |= INP_SOCKREF;
1061         }
1062         INP_WUNLOCK(inp);
1063         INP_INFO_RUNLOCK(&V_tcbinfo);
1064 }
1065
1066 /*
1067  * Receive out-of-band data.
1068  */
1069 static int
1070 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1071 {
1072         int error = 0;
1073         struct inpcb *inp;
1074         struct tcpcb *tp = NULL;
1075
1076         TCPDEBUG0;
1077         inp = sotoinpcb(so);
1078         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1079         INP_WLOCK(inp);
1080         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1081                 error = ECONNRESET;
1082                 goto out;
1083         }
1084         tp = intotcpcb(inp);
1085         TCPDEBUG1();
1086         if ((so->so_oobmark == 0 &&
1087              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1088             so->so_options & SO_OOBINLINE ||
1089             tp->t_oobflags & TCPOOB_HADDATA) {
1090                 error = EINVAL;
1091                 goto out;
1092         }
1093         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1094                 error = EWOULDBLOCK;
1095                 goto out;
1096         }
1097         m->m_len = 1;
1098         *mtod(m, caddr_t) = tp->t_iobc;
1099         if ((flags & MSG_PEEK) == 0)
1100                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1101
1102 out:
1103         TCPDEBUG2(PRU_RCVOOB);
1104         INP_WUNLOCK(inp);
1105         return (error);
1106 }
1107
1108 #ifdef INET
1109 struct pr_usrreqs tcp_usrreqs = {
1110         .pru_abort =            tcp_usr_abort,
1111         .pru_accept =           tcp_usr_accept,
1112         .pru_attach =           tcp_usr_attach,
1113         .pru_bind =             tcp_usr_bind,
1114         .pru_connect =          tcp_usr_connect,
1115         .pru_control =          in_control,
1116         .pru_detach =           tcp_usr_detach,
1117         .pru_disconnect =       tcp_usr_disconnect,
1118         .pru_listen =           tcp_usr_listen,
1119         .pru_peeraddr =         in_getpeeraddr,
1120         .pru_rcvd =             tcp_usr_rcvd,
1121         .pru_rcvoob =           tcp_usr_rcvoob,
1122         .pru_send =             tcp_usr_send,
1123         .pru_ready =            tcp_usr_ready,
1124         .pru_shutdown =         tcp_usr_shutdown,
1125         .pru_sockaddr =         in_getsockaddr,
1126         .pru_sosetlabel =       in_pcbsosetlabel,
1127         .pru_close =            tcp_usr_close,
1128 };
1129 #endif /* INET */
1130
1131 #ifdef INET6
1132 struct pr_usrreqs tcp6_usrreqs = {
1133         .pru_abort =            tcp_usr_abort,
1134         .pru_accept =           tcp6_usr_accept,
1135         .pru_attach =           tcp_usr_attach,
1136         .pru_bind =             tcp6_usr_bind,
1137         .pru_connect =          tcp6_usr_connect,
1138         .pru_control =          in6_control,
1139         .pru_detach =           tcp_usr_detach,
1140         .pru_disconnect =       tcp_usr_disconnect,
1141         .pru_listen =           tcp6_usr_listen,
1142         .pru_peeraddr =         in6_mapped_peeraddr,
1143         .pru_rcvd =             tcp_usr_rcvd,
1144         .pru_rcvoob =           tcp_usr_rcvoob,
1145         .pru_send =             tcp_usr_send,
1146         .pru_ready =            tcp_usr_ready,
1147         .pru_shutdown =         tcp_usr_shutdown,
1148         .pru_sockaddr =         in6_mapped_sockaddr,
1149         .pru_sosetlabel =       in_pcbsosetlabel,
1150         .pru_close =            tcp_usr_close,
1151 };
1152 #endif /* INET6 */
1153
1154 #ifdef INET
1155 /*
1156  * Common subroutine to open a TCP connection to remote host specified
1157  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1158  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1159  * to choose a local host address (interface).  If there is an existing
1160  * incarnation of the same connection in TIME-WAIT state and if the remote
1161  * host was sending CC options and if the connection duration was < MSL, then
1162  * truncate the previous TIME-WAIT state and proceed.
1163  * Initialize connection parameters and enter SYN-SENT state.
1164  */
1165 static int
1166 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1167 {
1168         struct inpcb *inp = tp->t_inpcb, *oinp;
1169         struct socket *so = inp->inp_socket;
1170         struct in_addr laddr;
1171         u_short lport;
1172         int error;
1173
1174         INP_WLOCK_ASSERT(inp);
1175         INP_HASH_WLOCK(&V_tcbinfo);
1176
1177         if (inp->inp_lport == 0) {
1178                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1179                 if (error)
1180                         goto out;
1181         }
1182
1183         /*
1184          * Cannot simply call in_pcbconnect, because there might be an
1185          * earlier incarnation of this same connection still in
1186          * TIME_WAIT state, creating an ADDRINUSE error.
1187          */
1188         laddr = inp->inp_laddr;
1189         lport = inp->inp_lport;
1190         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1191             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1192         if (error && oinp == NULL)
1193                 goto out;
1194         if (oinp) {
1195                 error = EADDRINUSE;
1196                 goto out;
1197         }
1198         inp->inp_laddr = laddr;
1199         in_pcbrehash(inp);
1200         INP_HASH_WUNLOCK(&V_tcbinfo);
1201
1202         /*
1203          * Compute window scaling to request:
1204          * Scale to fit into sweet spot.  See tcp_syncache.c.
1205          * XXX: This should move to tcp_output().
1206          */
1207         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1208             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1209                 tp->request_r_scale++;
1210
1211         soisconnecting(so);
1212         TCPSTAT_INC(tcps_connattempt);
1213         tcp_state_change(tp, TCPS_SYN_SENT);
1214         tp->iss = tcp_new_isn(tp);
1215         tcp_sendseqinit(tp);
1216
1217         return 0;
1218
1219 out:
1220         INP_HASH_WUNLOCK(&V_tcbinfo);
1221         return (error);
1222 }
1223 #endif /* INET */
1224
1225 #ifdef INET6
1226 static int
1227 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1228 {
1229         struct inpcb *inp = tp->t_inpcb;
1230         int error;
1231
1232         INP_WLOCK_ASSERT(inp);
1233         INP_HASH_WLOCK(&V_tcbinfo);
1234
1235         if (inp->inp_lport == 0) {
1236                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1237                 if (error)
1238                         goto out;
1239         }
1240         error = in6_pcbconnect(inp, nam, td->td_ucred);
1241         if (error != 0)
1242                 goto out;
1243         INP_HASH_WUNLOCK(&V_tcbinfo);
1244
1245         /* Compute window scaling to request.  */
1246         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1247             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1248                 tp->request_r_scale++;
1249
1250         soisconnecting(inp->inp_socket);
1251         TCPSTAT_INC(tcps_connattempt);
1252         tcp_state_change(tp, TCPS_SYN_SENT);
1253         tp->iss = tcp_new_isn(tp);
1254         tcp_sendseqinit(tp);
1255
1256         return 0;
1257
1258 out:
1259         INP_HASH_WUNLOCK(&V_tcbinfo);
1260         return error;
1261 }
1262 #endif /* INET6 */
1263
1264 /*
1265  * Export TCP internal state information via a struct tcp_info, based on the
1266  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1267  * (TCP state machine, etc).  We export all information using FreeBSD-native
1268  * constants -- for example, the numeric values for tcpi_state will differ
1269  * from Linux.
1270  */
1271 static void
1272 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1273 {
1274
1275         INP_WLOCK_ASSERT(tp->t_inpcb);
1276         bzero(ti, sizeof(*ti));
1277
1278         ti->tcpi_state = tp->t_state;
1279         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1280                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1281         if (tp->t_flags & TF_SACK_PERMIT)
1282                 ti->tcpi_options |= TCPI_OPT_SACK;
1283         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1284                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1285                 ti->tcpi_snd_wscale = tp->snd_scale;
1286                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1287         }
1288
1289         ti->tcpi_rto = tp->t_rxtcur * tick;
1290         ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
1291         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1292         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1293
1294         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1295         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1296
1297         /*
1298          * FreeBSD-specific extension fields for tcp_info.
1299          */
1300         ti->tcpi_rcv_space = tp->rcv_wnd;
1301         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1302         ti->tcpi_snd_wnd = tp->snd_wnd;
1303         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1304         ti->tcpi_snd_nxt = tp->snd_nxt;
1305         ti->tcpi_snd_mss = tp->t_maxseg;
1306         ti->tcpi_rcv_mss = tp->t_maxseg;
1307         if (tp->t_flags & TF_TOE)
1308                 ti->tcpi_options |= TCPI_OPT_TOE;
1309         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1310         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1311         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1312 }
1313
1314 /*
1315  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1316  * socket option arguments.  When it re-acquires the lock after the copy, it
1317  * has to revalidate that the connection is still valid for the socket
1318  * option.
1319  */
1320 #define INP_WLOCK_RECHECK(inp) do {                                     \
1321         INP_WLOCK(inp);                                                 \
1322         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1323                 INP_WUNLOCK(inp);                                       \
1324                 return (ECONNRESET);                                    \
1325         }                                                               \
1326         tp = intotcpcb(inp);                                            \
1327 } while(0)
1328
1329 int
1330 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1331 {
1332         int     error, opt, optval;
1333         u_int   ui;
1334         struct  inpcb *inp;
1335         struct  tcpcb *tp;
1336         struct  tcp_info ti;
1337         char buf[TCP_CA_NAME_MAX];
1338         struct cc_algo *algo;
1339
1340         error = 0;
1341         inp = sotoinpcb(so);
1342         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1343         INP_WLOCK(inp);
1344         if (sopt->sopt_level != IPPROTO_TCP) {
1345 #ifdef INET6
1346                 if (inp->inp_vflag & INP_IPV6PROTO) {
1347                         INP_WUNLOCK(inp);
1348                         error = ip6_ctloutput(so, sopt);
1349                 }
1350 #endif /* INET6 */
1351 #if defined(INET6) && defined(INET)
1352                 else
1353 #endif
1354 #ifdef INET
1355                 {
1356                         INP_WUNLOCK(inp);
1357                         error = ip_ctloutput(so, sopt);
1358                 }
1359 #endif
1360                 return (error);
1361         }
1362         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1363                 INP_WUNLOCK(inp);
1364                 return (ECONNRESET);
1365         }
1366
1367         switch (sopt->sopt_dir) {
1368         case SOPT_SET:
1369                 switch (sopt->sopt_name) {
1370 #ifdef TCP_SIGNATURE
1371                 case TCP_MD5SIG:
1372                         INP_WUNLOCK(inp);
1373                         error = sooptcopyin(sopt, &optval, sizeof optval,
1374                             sizeof optval);
1375                         if (error)
1376                                 return (error);
1377
1378                         INP_WLOCK_RECHECK(inp);
1379                         if (optval > 0)
1380                                 tp->t_flags |= TF_SIGNATURE;
1381                         else
1382                                 tp->t_flags &= ~TF_SIGNATURE;
1383                         goto unlock_and_done;
1384 #endif /* TCP_SIGNATURE */
1385
1386                 case TCP_NODELAY:
1387                 case TCP_NOOPT:
1388                         INP_WUNLOCK(inp);
1389                         error = sooptcopyin(sopt, &optval, sizeof optval,
1390                             sizeof optval);
1391                         if (error)
1392                                 return (error);
1393
1394                         INP_WLOCK_RECHECK(inp);
1395                         switch (sopt->sopt_name) {
1396                         case TCP_NODELAY:
1397                                 opt = TF_NODELAY;
1398                                 break;
1399                         case TCP_NOOPT:
1400                                 opt = TF_NOOPT;
1401                                 break;
1402                         default:
1403                                 opt = 0; /* dead code to fool gcc */
1404                                 break;
1405                         }
1406
1407                         if (optval)
1408                                 tp->t_flags |= opt;
1409                         else
1410                                 tp->t_flags &= ~opt;
1411 unlock_and_done:
1412 #ifdef TCP_OFFLOAD
1413                         if (tp->t_flags & TF_TOE) {
1414                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1415                                     sopt->sopt_name);
1416                         }
1417 #endif
1418                         INP_WUNLOCK(inp);
1419                         break;
1420
1421                 case TCP_NOPUSH:
1422                         INP_WUNLOCK(inp);
1423                         error = sooptcopyin(sopt, &optval, sizeof optval,
1424                             sizeof optval);
1425                         if (error)
1426                                 return (error);
1427
1428                         INP_WLOCK_RECHECK(inp);
1429                         if (optval)
1430                                 tp->t_flags |= TF_NOPUSH;
1431                         else if (tp->t_flags & TF_NOPUSH) {
1432                                 tp->t_flags &= ~TF_NOPUSH;
1433                                 if (TCPS_HAVEESTABLISHED(tp->t_state))
1434                                         error = tcp_output(tp);
1435                         }
1436                         goto unlock_and_done;
1437
1438                 case TCP_MAXSEG:
1439                         INP_WUNLOCK(inp);
1440                         error = sooptcopyin(sopt, &optval, sizeof optval,
1441                             sizeof optval);
1442                         if (error)
1443                                 return (error);
1444
1445                         INP_WLOCK_RECHECK(inp);
1446                         if (optval > 0 && optval <= tp->t_maxseg &&
1447                             optval + 40 >= V_tcp_minmss)
1448                                 tp->t_maxseg = optval;
1449                         else
1450                                 error = EINVAL;
1451                         goto unlock_and_done;
1452
1453                 case TCP_INFO:
1454                         INP_WUNLOCK(inp);
1455                         error = EINVAL;
1456                         break;
1457
1458                 case TCP_CONGESTION:
1459                         INP_WUNLOCK(inp);
1460                         bzero(buf, sizeof(buf));
1461                         error = sooptcopyin(sopt, &buf, sizeof(buf), 1);
1462                         if (error)
1463                                 break;
1464                         INP_WLOCK_RECHECK(inp);
1465                         /*
1466                          * Return EINVAL if we can't find the requested cc algo.
1467                          */
1468                         error = EINVAL;
1469                         CC_LIST_RLOCK();
1470                         STAILQ_FOREACH(algo, &cc_list, entries) {
1471                                 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX)
1472                                     == 0) {
1473                                         /* We've found the requested algo. */
1474                                         error = 0;
1475                                         /*
1476                                          * We hold a write lock over the tcb
1477                                          * so it's safe to do these things
1478                                          * without ordering concerns.
1479                                          */
1480                                         if (CC_ALGO(tp)->cb_destroy != NULL)
1481                                                 CC_ALGO(tp)->cb_destroy(tp->ccv);
1482                                         CC_ALGO(tp) = algo;
1483                                         /*
1484                                          * If something goes pear shaped
1485                                          * initialising the new algo,
1486                                          * fall back to newreno (which
1487                                          * does not require initialisation).
1488                                          */
1489                                         if (algo->cb_init != NULL)
1490                                                 if (algo->cb_init(tp->ccv) > 0) {
1491                                                         CC_ALGO(tp) = &newreno_cc_algo;
1492                                                         /*
1493                                                          * The only reason init
1494                                                          * should fail is
1495                                                          * because of malloc.
1496                                                          */
1497                                                         error = ENOMEM;
1498                                                 }
1499                                         break; /* Break the STAILQ_FOREACH. */
1500                                 }
1501                         }
1502                         CC_LIST_RUNLOCK();
1503                         goto unlock_and_done;
1504
1505                 case TCP_KEEPIDLE:
1506                 case TCP_KEEPINTVL:
1507                 case TCP_KEEPINIT:
1508                         INP_WUNLOCK(inp);
1509                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1510                         if (error)
1511                                 return (error);
1512
1513                         if (ui > (UINT_MAX / hz)) {
1514                                 error = EINVAL;
1515                                 break;
1516                         }
1517                         ui *= hz;
1518
1519                         INP_WLOCK_RECHECK(inp);
1520                         switch (sopt->sopt_name) {
1521                         case TCP_KEEPIDLE:
1522                                 tp->t_keepidle = ui;
1523                                 /*
1524                                  * XXX: better check current remaining
1525                                  * timeout and "merge" it with new value.
1526                                  */
1527                                 if ((tp->t_state > TCPS_LISTEN) &&
1528                                     (tp->t_state <= TCPS_CLOSING))
1529                                         tcp_timer_activate(tp, TT_KEEP,
1530                                             TP_KEEPIDLE(tp));
1531                                 break;
1532                         case TCP_KEEPINTVL:
1533                                 tp->t_keepintvl = ui;
1534                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1535                                     (TP_MAXIDLE(tp) > 0))
1536                                         tcp_timer_activate(tp, TT_2MSL,
1537                                             TP_MAXIDLE(tp));
1538                                 break;
1539                         case TCP_KEEPINIT:
1540                                 tp->t_keepinit = ui;
1541                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
1542                                     tp->t_state == TCPS_SYN_SENT)
1543                                         tcp_timer_activate(tp, TT_KEEP,
1544                                             TP_KEEPINIT(tp));
1545                                 break;
1546                         }
1547                         goto unlock_and_done;
1548
1549                 case TCP_KEEPCNT:
1550                         INP_WUNLOCK(inp);
1551                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1552                         if (error)
1553                                 return (error);
1554
1555                         INP_WLOCK_RECHECK(inp);
1556                         tp->t_keepcnt = ui;
1557                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1558                             (TP_MAXIDLE(tp) > 0))
1559                                 tcp_timer_activate(tp, TT_2MSL,
1560                                     TP_MAXIDLE(tp));
1561                         goto unlock_and_done;
1562
1563                 default:
1564                         INP_WUNLOCK(inp);
1565                         error = ENOPROTOOPT;
1566                         break;
1567                 }
1568                 break;
1569
1570         case SOPT_GET:
1571                 tp = intotcpcb(inp);
1572                 switch (sopt->sopt_name) {
1573 #ifdef TCP_SIGNATURE
1574                 case TCP_MD5SIG:
1575                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1576                         INP_WUNLOCK(inp);
1577                         error = sooptcopyout(sopt, &optval, sizeof optval);
1578                         break;
1579 #endif
1580
1581                 case TCP_NODELAY:
1582                         optval = tp->t_flags & TF_NODELAY;
1583                         INP_WUNLOCK(inp);
1584                         error = sooptcopyout(sopt, &optval, sizeof optval);
1585                         break;
1586                 case TCP_MAXSEG:
1587                         optval = tp->t_maxseg;
1588                         INP_WUNLOCK(inp);
1589                         error = sooptcopyout(sopt, &optval, sizeof optval);
1590                         break;
1591                 case TCP_NOOPT:
1592                         optval = tp->t_flags & TF_NOOPT;
1593                         INP_WUNLOCK(inp);
1594                         error = sooptcopyout(sopt, &optval, sizeof optval);
1595                         break;
1596                 case TCP_NOPUSH:
1597                         optval = tp->t_flags & TF_NOPUSH;
1598                         INP_WUNLOCK(inp);
1599                         error = sooptcopyout(sopt, &optval, sizeof optval);
1600                         break;
1601                 case TCP_INFO:
1602                         tcp_fill_info(tp, &ti);
1603                         INP_WUNLOCK(inp);
1604                         error = sooptcopyout(sopt, &ti, sizeof ti);
1605                         break;
1606                 case TCP_CONGESTION:
1607                         bzero(buf, sizeof(buf));
1608                         strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
1609                         INP_WUNLOCK(inp);
1610                         error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX);
1611                         break;
1612                 case TCP_KEEPIDLE:
1613                 case TCP_KEEPINTVL:
1614                 case TCP_KEEPINIT:
1615                 case TCP_KEEPCNT:
1616                         switch (sopt->sopt_name) {
1617                         case TCP_KEEPIDLE:
1618                                 ui = tp->t_keepidle / hz;
1619                                 break;
1620                         case TCP_KEEPINTVL:
1621                                 ui = tp->t_keepintvl / hz;
1622                                 break;
1623                         case TCP_KEEPINIT:
1624                                 ui = tp->t_keepinit / hz;
1625                                 break;
1626                         case TCP_KEEPCNT:
1627                                 ui = tp->t_keepcnt;
1628                                 break;
1629                         }
1630                         INP_WUNLOCK(inp);
1631                         error = sooptcopyout(sopt, &ui, sizeof(ui));
1632                         break;
1633                 default:
1634                         INP_WUNLOCK(inp);
1635                         error = ENOPROTOOPT;
1636                         break;
1637                 }
1638                 break;
1639         }
1640         return (error);
1641 }
1642 #undef INP_WLOCK_RECHECK
1643
1644 /*
1645  * Attach TCP protocol to socket, allocating
1646  * internet protocol control block, tcp control block,
1647  * bufer space, and entering LISTEN state if to accept connections.
1648  */
1649 static int
1650 tcp_attach(struct socket *so)
1651 {
1652         struct tcpcb *tp;
1653         struct inpcb *inp;
1654         int error;
1655
1656         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1657                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
1658                 if (error)
1659                         return (error);
1660         }
1661         so->so_rcv.sb_flags |= SB_AUTOSIZE;
1662         so->so_snd.sb_flags |= SB_AUTOSIZE;
1663         INP_INFO_RLOCK(&V_tcbinfo);
1664         error = in_pcballoc(so, &V_tcbinfo);
1665         if (error) {
1666                 INP_INFO_RUNLOCK(&V_tcbinfo);
1667                 return (error);
1668         }
1669         inp = sotoinpcb(so);
1670 #ifdef INET6
1671         if (inp->inp_vflag & INP_IPV6PROTO) {
1672                 inp->inp_vflag |= INP_IPV6;
1673                 inp->in6p_hops = -1;    /* use kernel default */
1674         }
1675         else
1676 #endif
1677         inp->inp_vflag |= INP_IPV4;
1678         tp = tcp_newtcpcb(inp);
1679         if (tp == NULL) {
1680                 in_pcbdetach(inp);
1681                 in_pcbfree(inp);
1682                 INP_INFO_RUNLOCK(&V_tcbinfo);
1683                 return (ENOBUFS);
1684         }
1685         tp->t_state = TCPS_CLOSED;
1686         INP_WUNLOCK(inp);
1687         INP_INFO_RUNLOCK(&V_tcbinfo);
1688         return (0);
1689 }
1690
1691 /*
1692  * Initiate (or continue) disconnect.
1693  * If embryonic state, just send reset (once).
1694  * If in ``let data drain'' option and linger null, just drop.
1695  * Otherwise (hard), mark socket disconnecting and drop
1696  * current input data; switch states based on user close, and
1697  * send segment to peer (with FIN).
1698  */
1699 static void
1700 tcp_disconnect(struct tcpcb *tp)
1701 {
1702         struct inpcb *inp = tp->t_inpcb;
1703         struct socket *so = inp->inp_socket;
1704
1705         INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
1706         INP_WLOCK_ASSERT(inp);
1707
1708         /*
1709          * Neither tcp_close() nor tcp_drop() should return NULL, as the
1710          * socket is still open.
1711          */
1712         if (tp->t_state < TCPS_ESTABLISHED) {
1713                 tp = tcp_close(tp);
1714                 KASSERT(tp != NULL,
1715                     ("tcp_disconnect: tcp_close() returned NULL"));
1716         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1717                 tp = tcp_drop(tp, 0);
1718                 KASSERT(tp != NULL,
1719                     ("tcp_disconnect: tcp_drop() returned NULL"));
1720         } else {
1721                 soisdisconnecting(so);
1722                 sbflush(&so->so_rcv);
1723                 tcp_usrclosed(tp);
1724                 if (!(inp->inp_flags & INP_DROPPED))
1725                         tcp_output(tp);
1726         }
1727 }
1728
1729 /*
1730  * User issued close, and wish to trail through shutdown states:
1731  * if never received SYN, just forget it.  If got a SYN from peer,
1732  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1733  * If already got a FIN from peer, then almost done; go to LAST_ACK
1734  * state.  In all other cases, have already sent FIN to peer (e.g.
1735  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1736  * for peer to send FIN or not respond to keep-alives, etc.
1737  * We can let the user exit from the close as soon as the FIN is acked.
1738  */
1739 static void
1740 tcp_usrclosed(struct tcpcb *tp)
1741 {
1742
1743         INP_INFO_RLOCK_ASSERT(&V_tcbinfo);
1744         INP_WLOCK_ASSERT(tp->t_inpcb);
1745
1746         switch (tp->t_state) {
1747         case TCPS_LISTEN:
1748 #ifdef TCP_OFFLOAD
1749                 tcp_offload_listen_stop(tp);
1750 #endif
1751                 /* FALLTHROUGH */
1752         case TCPS_CLOSED:
1753                 tcp_state_change(tp, TCPS_CLOSED);
1754                 tp = tcp_close(tp);
1755                 /*
1756                  * tcp_close() should never return NULL here as the socket is
1757                  * still open.
1758                  */
1759                 KASSERT(tp != NULL,
1760                     ("tcp_usrclosed: tcp_close() returned NULL"));
1761                 break;
1762
1763         case TCPS_SYN_SENT:
1764         case TCPS_SYN_RECEIVED:
1765                 tp->t_flags |= TF_NEEDFIN;
1766                 break;
1767
1768         case TCPS_ESTABLISHED:
1769                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
1770                 break;
1771
1772         case TCPS_CLOSE_WAIT:
1773                 tcp_state_change(tp, TCPS_LAST_ACK);
1774                 break;
1775         }
1776         if (tp->t_state >= TCPS_FIN_WAIT_2) {
1777                 soisdisconnected(tp->t_inpcb->inp_socket);
1778                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1779                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1780                         int timeout;
1781
1782                         timeout = (tcp_fast_finwait2_recycle) ?
1783                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
1784                         tcp_timer_activate(tp, TT_2MSL, timeout);
1785                 }
1786         }
1787 }
1788
1789 #ifdef DDB
1790 static void
1791 db_print_indent(int indent)
1792 {
1793         int i;
1794
1795         for (i = 0; i < indent; i++)
1796                 db_printf(" ");
1797 }
1798
1799 static void
1800 db_print_tstate(int t_state)
1801 {
1802
1803         switch (t_state) {
1804         case TCPS_CLOSED:
1805                 db_printf("TCPS_CLOSED");
1806                 return;
1807
1808         case TCPS_LISTEN:
1809                 db_printf("TCPS_LISTEN");
1810                 return;
1811
1812         case TCPS_SYN_SENT:
1813                 db_printf("TCPS_SYN_SENT");
1814                 return;
1815
1816         case TCPS_SYN_RECEIVED:
1817                 db_printf("TCPS_SYN_RECEIVED");
1818                 return;
1819
1820         case TCPS_ESTABLISHED:
1821                 db_printf("TCPS_ESTABLISHED");
1822                 return;
1823
1824         case TCPS_CLOSE_WAIT:
1825                 db_printf("TCPS_CLOSE_WAIT");
1826                 return;
1827
1828         case TCPS_FIN_WAIT_1:
1829                 db_printf("TCPS_FIN_WAIT_1");
1830                 return;
1831
1832         case TCPS_CLOSING:
1833                 db_printf("TCPS_CLOSING");
1834                 return;
1835
1836         case TCPS_LAST_ACK:
1837                 db_printf("TCPS_LAST_ACK");
1838                 return;
1839
1840         case TCPS_FIN_WAIT_2:
1841                 db_printf("TCPS_FIN_WAIT_2");
1842                 return;
1843
1844         case TCPS_TIME_WAIT:
1845                 db_printf("TCPS_TIME_WAIT");
1846                 return;
1847
1848         default:
1849                 db_printf("unknown");
1850                 return;
1851         }
1852 }
1853
1854 static void
1855 db_print_tflags(u_int t_flags)
1856 {
1857         int comma;
1858
1859         comma = 0;
1860         if (t_flags & TF_ACKNOW) {
1861                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1862                 comma = 1;
1863         }
1864         if (t_flags & TF_DELACK) {
1865                 db_printf("%sTF_DELACK", comma ? ", " : "");
1866                 comma = 1;
1867         }
1868         if (t_flags & TF_NODELAY) {
1869                 db_printf("%sTF_NODELAY", comma ? ", " : "");
1870                 comma = 1;
1871         }
1872         if (t_flags & TF_NOOPT) {
1873                 db_printf("%sTF_NOOPT", comma ? ", " : "");
1874                 comma = 1;
1875         }
1876         if (t_flags & TF_SENTFIN) {
1877                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1878                 comma = 1;
1879         }
1880         if (t_flags & TF_REQ_SCALE) {
1881                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1882                 comma = 1;
1883         }
1884         if (t_flags & TF_RCVD_SCALE) {
1885                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1886                 comma = 1;
1887         }
1888         if (t_flags & TF_REQ_TSTMP) {
1889                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1890                 comma = 1;
1891         }
1892         if (t_flags & TF_RCVD_TSTMP) {
1893                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1894                 comma = 1;
1895         }
1896         if (t_flags & TF_SACK_PERMIT) {
1897                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1898                 comma = 1;
1899         }
1900         if (t_flags & TF_NEEDSYN) {
1901                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1902                 comma = 1;
1903         }
1904         if (t_flags & TF_NEEDFIN) {
1905                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1906                 comma = 1;
1907         }
1908         if (t_flags & TF_NOPUSH) {
1909                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1910                 comma = 1;
1911         }
1912         if (t_flags & TF_MORETOCOME) {
1913                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1914                 comma = 1;
1915         }
1916         if (t_flags & TF_LQ_OVERFLOW) {
1917                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1918                 comma = 1;
1919         }
1920         if (t_flags & TF_LASTIDLE) {
1921                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1922                 comma = 1;
1923         }
1924         if (t_flags & TF_RXWIN0SENT) {
1925                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1926                 comma = 1;
1927         }
1928         if (t_flags & TF_FASTRECOVERY) {
1929                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1930                 comma = 1;
1931         }
1932         if (t_flags & TF_CONGRECOVERY) {
1933                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
1934                 comma = 1;
1935         }
1936         if (t_flags & TF_WASFRECOVERY) {
1937                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1938                 comma = 1;
1939         }
1940         if (t_flags & TF_SIGNATURE) {
1941                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1942                 comma = 1;
1943         }
1944         if (t_flags & TF_FORCEDATA) {
1945                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1946                 comma = 1;
1947         }
1948         if (t_flags & TF_TSO) {
1949                 db_printf("%sTF_TSO", comma ? ", " : "");
1950                 comma = 1;
1951         }
1952         if (t_flags & TF_ECN_PERMIT) {
1953                 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
1954                 comma = 1;
1955         }
1956 }
1957
1958 static void
1959 db_print_toobflags(char t_oobflags)
1960 {
1961         int comma;
1962
1963         comma = 0;
1964         if (t_oobflags & TCPOOB_HAVEDATA) {
1965                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1966                 comma = 1;
1967         }
1968         if (t_oobflags & TCPOOB_HADDATA) {
1969                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1970                 comma = 1;
1971         }
1972 }
1973
1974 static void
1975 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1976 {
1977
1978         db_print_indent(indent);
1979         db_printf("%s at %p\n", name, tp);
1980
1981         indent += 2;
1982
1983         db_print_indent(indent);
1984         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
1985            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1986
1987         db_print_indent(indent);
1988         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
1989             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1990
1991         db_print_indent(indent);
1992         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1993             &tp->t_timers->tt_delack, tp->t_inpcb);
1994
1995         db_print_indent(indent);
1996         db_printf("t_state: %d (", tp->t_state);
1997         db_print_tstate(tp->t_state);
1998         db_printf(")\n");
1999
2000         db_print_indent(indent);
2001         db_printf("t_flags: 0x%x (", tp->t_flags);
2002         db_print_tflags(tp->t_flags);
2003         db_printf(")\n");
2004
2005         db_print_indent(indent);
2006         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
2007             tp->snd_una, tp->snd_max, tp->snd_nxt);
2008
2009         db_print_indent(indent);
2010         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
2011            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
2012
2013         db_print_indent(indent);
2014         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
2015             tp->iss, tp->irs, tp->rcv_nxt);
2016
2017         db_print_indent(indent);
2018         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
2019             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
2020
2021         db_print_indent(indent);
2022         db_printf("snd_wnd: %lu   snd_cwnd: %lu\n",
2023            tp->snd_wnd, tp->snd_cwnd);
2024
2025         db_print_indent(indent);
2026         db_printf("snd_ssthresh: %lu   snd_recover: "
2027             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
2028
2029         db_print_indent(indent);
2030         db_printf("t_maxopd: %u   t_rcvtime: %u   t_startime: %u\n",
2031             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
2032
2033         db_print_indent(indent);
2034         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
2035             tp->t_rtttime, tp->t_rtseq);
2036
2037         db_print_indent(indent);
2038         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
2039             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
2040
2041         db_print_indent(indent);
2042         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
2043             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
2044             tp->t_rttbest);
2045
2046         db_print_indent(indent);
2047         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
2048             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2049
2050         db_print_indent(indent);
2051         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2052         db_print_toobflags(tp->t_oobflags);
2053         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
2054
2055         db_print_indent(indent);
2056         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
2057             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2058
2059         db_print_indent(indent);
2060         db_printf("ts_recent: %u   ts_recent_age: %u\n",
2061             tp->ts_recent, tp->ts_recent_age);
2062
2063         db_print_indent(indent);
2064         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
2065             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2066
2067         db_print_indent(indent);
2068         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
2069             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2070             tp->snd_recover_prev, tp->t_badrxtwin);
2071
2072         db_print_indent(indent);
2073         db_printf("snd_numholes: %d  snd_holes first: %p\n",
2074             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2075
2076         db_print_indent(indent);
2077         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
2078             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
2079
2080         /* Skip sackblks, sackhint. */
2081
2082         db_print_indent(indent);
2083         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
2084             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2085 }
2086
2087 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2088 {
2089         struct tcpcb *tp;
2090
2091         if (!have_addr) {
2092                 db_printf("usage: show tcpcb <addr>\n");
2093                 return;
2094         }
2095         tp = (struct tcpcb *)addr;
2096
2097         db_print_tcpcb(tp, "tcpcb", 0);
2098 }
2099 #endif