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