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                 if (inp->inp_flags & INP_DROPPED) {
 188                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
 189                             "INP_DROPPED && tp != NULL"));
 190                         in_pcbdetach(inp);
 191                         in_pcbfree(inp);
 192                 } else {
 193                         in_pcbdetach(inp);
 194                         INP_WUNLOCK(inp);
 195                 }
 196         } else {
 197                 /*
 198                  * If the connection is not in timewait, we consider two
 199                  * two conditions: one in which no further processing is
 200                  * necessary (dropped || embryonic), and one in which TCP is
 201                  * not yet done, but no longer requires the socket, so the
 202                  * pcb will persist for the time being.
 203                  *
 204                  * XXXRW: Does the second case still occur?
 205                  */
 206                 if (inp->inp_flags & INP_DROPPED ||
 207                     tp->t_state < TCPS_SYN_SENT) {
 208                         tcp_discardcb(tp);
 209                         in_pcbdetach(inp);
 210                         in_pcbfree(inp);
 211                 } else {
 212                         in_pcbdetach(inp);
 213                         INP_WUNLOCK(inp);
 214                 }
 215         }
 216 }
 217
 218 /*
 219  * pru_detach() detaches the TCP protocol from the socket.
 220  * If the protocol state is non-embryonic, then can't
 221  * do this directly: have to initiate a pru_disconnect(),
 222  * which may finish later; embryonic TCB's can just
 223  * be discarded here.
 224  */
 225 static void
 226 tcp_usr_detach(struct socket *so)
 227 {
 228         struct inpcb *inp;
 229
 230         inp = sotoinpcb(so);
 231         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
 232         INP_INFO_WLOCK(&V_tcbinfo);
 233         INP_WLOCK(inp);
 234         KASSERT(inp->inp_socket != NULL,
 235             ("tcp_usr_detach: inp_socket == NULL"));
 236         tcp_detach(so, inp);
 237         INP_INFO_WUNLOCK(&V_tcbinfo);
 238 }
 239
 240 #ifdef INET
 241 /*
 242  * Give the socket an address.
 243  */
 244 static int
 245 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 246 {
 247         int error = 0;
 248         struct inpcb *inp;
 249         struct tcpcb *tp = NULL;
 250         struct sockaddr_in *sinp;
 251
 252         sinp = (struct sockaddr_in *)nam;
 253         if (nam->sa_len != sizeof (*sinp))
 254                 return (EINVAL);
 255         /*
 256          * Must check for multicast addresses and disallow binding
 257          * to them.
 258          */
 259         if (sinp->sin_family == AF_INET &&
 260             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 261                 return (EAFNOSUPPORT);
 262
 263         TCPDEBUG0;
 264         inp = sotoinpcb(so);
 265         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
 266         INP_WLOCK(inp);
 267         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 268                 error = EINVAL;
 269                 goto out;
 270         }
 271         tp = intotcpcb(inp);
 272         TCPDEBUG1();
 273         INP_HASH_WLOCK(&V_tcbinfo);
 274         error = in_pcbbind(inp, nam, td->td_ucred);
 275         INP_HASH_WUNLOCK(&V_tcbinfo);
 276 out:
 277         TCPDEBUG2(PRU_BIND);
 278         INP_WUNLOCK(inp);
 279
 280         return (error);
 281 }
 282 #endif /* INET */
 283
 284 #ifdef INET6
 285 static int
 286 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 287 {
 288         int error = 0;
 289         struct inpcb *inp;
 290         struct tcpcb *tp = NULL;
 291         struct sockaddr_in6 *sin6p;
 292
 293         sin6p = (struct sockaddr_in6 *)nam;
 294         if (nam->sa_len != sizeof (*sin6p))
 295                 return (EINVAL);
 296         /*
 297          * Must check for multicast addresses and disallow binding
 298          * to them.
 299          */
 300         if (sin6p->sin6_family == AF_INET6 &&
 301             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 302                 return (EAFNOSUPPORT);
 303
 304         TCPDEBUG0;
 305         inp = sotoinpcb(so);
 306         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
 307         INP_WLOCK(inp);
 308         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 309                 error = EINVAL;
 310                 goto out;
 311         }
 312         tp = intotcpcb(inp);
 313         TCPDEBUG1();
 314         INP_HASH_WLOCK(&V_tcbinfo);
 315         inp->inp_vflag &= ~INP_IPV4;
 316         inp->inp_vflag |= INP_IPV6;
 317 #ifdef INET
 318         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
 319                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
 320                         inp->inp_vflag |= INP_IPV4;
 321                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 322                         struct sockaddr_in sin;
 323
 324                         in6_sin6_2_sin(&sin, sin6p);
 325                         inp->inp_vflag |= INP_IPV4;
 326                         inp->inp_vflag &= ~INP_IPV6;
 327                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
 328                             td->td_ucred);
 329                         INP_HASH_WUNLOCK(&V_tcbinfo);
 330                         goto out;
 331                 }
 332         }
 333 #endif
 334         error = in6_pcbbind(inp, nam, td->td_ucred);
 335         INP_HASH_WUNLOCK(&V_tcbinfo);
 336 out:
 337         TCPDEBUG2(PRU_BIND);
 338         INP_WUNLOCK(inp);
 339         return (error);
 340 }
 341 #endif /* INET6 */
 342
 343 #ifdef INET
 344 /*
 345  * Prepare to accept connections.
 346  */
 347 static int
 348 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
 349 {
 350         int error = 0;
 351         struct inpcb *inp;
 352         struct tcpcb *tp = NULL;
 353
 354         TCPDEBUG0;
 355         inp = sotoinpcb(so);
 356         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
 357         INP_WLOCK(inp);
 358         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 359                 error = EINVAL;
 360                 goto out;
 361         }
 362         tp = intotcpcb(inp);
 363         TCPDEBUG1();
 364         SOCK_LOCK(so);
 365         error = solisten_proto_check(so);
 366         INP_HASH_WLOCK(&V_tcbinfo);
 367         if (error == 0 && inp->inp_lport == 0)
 368                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 369         INP_HASH_WUNLOCK(&V_tcbinfo);
 370         if (error == 0) {
 371                 tcp_state_change(tp, TCPS_LISTEN);
 372                 solisten_proto(so, backlog);
 373 #ifdef TCP_OFFLOAD
 374                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 375                         tcp_offload_listen_start(tp);
 376 #endif
 377         }
 378         SOCK_UNLOCK(so);
 379
 380 out:
 381         TCPDEBUG2(PRU_LISTEN);
 382         INP_WUNLOCK(inp);
 383         return (error);
 384 }
 385 #endif /* INET */
 386
 387 #ifdef INET6
 388 static int
 389 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
 390 {
 391         int error = 0;
 392         struct inpcb *inp;
 393         struct tcpcb *tp = NULL;
 394
 395         TCPDEBUG0;
 396         inp = sotoinpcb(so);
 397         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
 398         INP_WLOCK(inp);
 399         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 400                 error = EINVAL;
 401                 goto out;
 402         }
 403         tp = intotcpcb(inp);
 404         TCPDEBUG1();
 405         SOCK_LOCK(so);
 406         error = solisten_proto_check(so);
 407         INP_HASH_WLOCK(&V_tcbinfo);
 408         if (error == 0 && inp->inp_lport == 0) {
 409                 inp->inp_vflag &= ~INP_IPV4;
 410                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
 411                         inp->inp_vflag |= INP_IPV4;
 412                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 413         }
 414         INP_HASH_WUNLOCK(&V_tcbinfo);
 415         if (error == 0) {
 416                 tcp_state_change(tp, TCPS_LISTEN);
 417                 solisten_proto(so, backlog);
 418 #ifdef TCP_OFFLOAD
 419                 if ((so->so_options & SO_NO_OFFLOAD) == 0)
 420                         tcp_offload_listen_start(tp);
 421 #endif
 422         }
 423         SOCK_UNLOCK(so);
 424
 425 out:
 426         TCPDEBUG2(PRU_LISTEN);
 427         INP_WUNLOCK(inp);
 428         return (error);
 429 }
 430 #endif /* INET6 */
 431
 432 #ifdef INET
 433 /*
 434  * Initiate connection to peer.
 435  * Create a template for use in transmissions on this connection.
 436  * Enter SYN_SENT state, and mark socket as connecting.
 437  * Start keep-alive timer, and seed output sequence space.
 438  * Send initial segment on connection.
 439  */
 440 static int
 441 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 442 {
 443         int error = 0;
 444         struct inpcb *inp;
 445         struct tcpcb *tp = NULL;
 446         struct sockaddr_in *sinp;
 447
 448         sinp = (struct sockaddr_in *)nam;
 449         if (nam->sa_len != sizeof (*sinp))
 450                 return (EINVAL);
 451         /*
 452          * Must disallow TCP ``connections'' to multicast addresses.
 453          */
 454         if (sinp->sin_family == AF_INET
 455             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
 456                 return (EAFNOSUPPORT);
 457         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
 458                 return (error);
 459
 460         TCPDEBUG0;
 461         inp = sotoinpcb(so);
 462         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
 463         INP_WLOCK(inp);
 464         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 465                 error = EINVAL;
 466                 goto out;
 467         }
 468         tp = intotcpcb(inp);
 469         TCPDEBUG1();
 470         if ((error = tcp_connect(tp, nam, td)) != 0)
 471                 goto out;
 472 #ifdef TCP_OFFLOAD
 473         if (registered_toedevs > 0 &&
 474             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 475             (error = tcp_offload_connect(so, nam)) == 0)
 476                 goto out;
 477 #endif
 478         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 479         error = tcp_output(tp);
 480 out:
 481         TCPDEBUG2(PRU_CONNECT);
 482         INP_WUNLOCK(inp);
 483         return (error);
 484 }
 485 #endif /* INET */
 486
 487 #ifdef INET6
 488 static int
 489 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 490 {
 491         int error = 0;
 492         struct inpcb *inp;
 493         struct tcpcb *tp = NULL;
 494         struct sockaddr_in6 *sin6p;
 495
 496         TCPDEBUG0;
 497
 498         sin6p = (struct sockaddr_in6 *)nam;
 499         if (nam->sa_len != sizeof (*sin6p))
 500                 return (EINVAL);
 501         /*
 502          * Must disallow TCP ``connections'' to multicast addresses.
 503          */
 504         if (sin6p->sin6_family == AF_INET6
 505             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
 506                 return (EAFNOSUPPORT);
 507
 508         inp = sotoinpcb(so);
 509         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
 510         INP_WLOCK(inp);
 511         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 512                 error = EINVAL;
 513                 goto out;
 514         }
 515         tp = intotcpcb(inp);
 516         TCPDEBUG1();
 517 #ifdef INET
 518         /*
 519          * XXXRW: Some confusion: V4/V6 flags relate to binding, and
 520          * therefore probably require the hash lock, which isn't held here.
 521          * Is this a significant problem?
 522          */
 523         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
 524                 struct sockaddr_in sin;
 525
 526                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
 527                         error = EINVAL;
 528                         goto out;
 529                 }
 530
 531                 in6_sin6_2_sin(&sin, sin6p);
 532                 inp->inp_vflag |= INP_IPV4;
 533                 inp->inp_vflag &= ~INP_IPV6;
 534                 if ((error = prison_remote_ip4(td->td_ucred,
 535                     &sin.sin_addr)) != 0)
 536                         goto out;
 537                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
 538                         goto out;
 539 #ifdef TCP_OFFLOAD
 540                 if (registered_toedevs > 0 &&
 541                     (so->so_options & SO_NO_OFFLOAD) == 0 &&
 542                     (error = tcp_offload_connect(so, nam)) == 0)
 543                         goto out;
 544 #endif
 545                 error = tcp_output(tp);
 546                 goto out;
 547         }
 548 #endif
 549         inp->inp_vflag &= ~INP_IPV4;
 550         inp->inp_vflag |= INP_IPV6;
 551         inp->inp_inc.inc_flags |= INC_ISIPV6;
 552         if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
 553                 goto out;
 554         if ((error = tcp6_connect(tp, nam, td)) != 0)
 555                 goto out;
 556 #ifdef TCP_OFFLOAD
 557         if (registered_toedevs > 0 &&
 558             (so->so_options & SO_NO_OFFLOAD) == 0 &&
 559             (error = tcp_offload_connect(so, nam)) == 0)
 560                 goto out;
 561 #endif
 562         tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp));
 563         error = tcp_output(tp);
 564
 565 out:
 566         TCPDEBUG2(PRU_CONNECT);
 567         INP_WUNLOCK(inp);
 568         return (error);
 569 }
 570 #endif /* INET6 */
 571
 572 /*
 573  * Initiate disconnect from peer.
 574  * If connection never passed embryonic stage, just drop;
 575  * else if don't need to let data drain, then can just drop anyways,
 576  * else have to begin TCP shutdown process: mark socket disconnecting,
 577  * drain unread data, state switch to reflect user close, and
 578  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
 579  * when peer sends FIN and acks ours.
 580  *
 581  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
 582  */
 583 static int
 584 tcp_usr_disconnect(struct socket *so)
 585 {
 586         struct inpcb *inp;
 587         struct tcpcb *tp = NULL;
 588         int error = 0;
 589
 590         TCPDEBUG0;
 591         INP_INFO_WLOCK(&V_tcbinfo);
 592         inp = sotoinpcb(so);
 593         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
 594         INP_WLOCK(inp);
 595         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 596                 error = ECONNRESET;
 597                 goto out;
 598         }
 599         tp = intotcpcb(inp);
 600         TCPDEBUG1();
 601         tcp_disconnect(tp);
 602 out:
 603         TCPDEBUG2(PRU_DISCONNECT);
 604         INP_WUNLOCK(inp);
 605         INP_INFO_WUNLOCK(&V_tcbinfo);
 606         return (error);
 607 }
 608
 609 #ifdef INET
 610 /*
 611  * Accept a connection.  Essentially all the work is done at higher levels;
 612  * just return the address of the peer, storing through addr.
 613  *
 614  * The rationale for acquiring the tcbinfo lock here is somewhat complicated,
 615  * and is described in detail in the commit log entry for r175612.  Acquiring
 616  * it delays an accept(2) racing with sonewconn(), which inserts the socket
 617  * before the inpcb address/port fields are initialized.  A better fix would
 618  * prevent the socket from being placed in the listen queue until all fields
 619  * are fully initialized.
 620  */
 621 static int
 622 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 623 {
 624         int error = 0;
 625         struct inpcb *inp = NULL;
 626         struct tcpcb *tp = NULL;
 627         struct in_addr addr;
 628         in_port_t port = 0;
 629         TCPDEBUG0;
 630
 631         if (so->so_state & SS_ISDISCONNECTED)
 632                 return (ECONNABORTED);
 633
 634         inp = sotoinpcb(so);
 635         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 636         INP_INFO_RLOCK(&V_tcbinfo);
 637         INP_WLOCK(inp);
 638         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 639                 error = ECONNABORTED;
 640                 goto out;
 641         }
 642         tp = intotcpcb(inp);
 643         TCPDEBUG1();
 644
 645         /*
 646          * We inline in_getpeeraddr and COMMON_END here, so that we can
 647          * copy the data of interest and defer the malloc until after we
 648          * release the lock.
 649          */
 650         port = inp->inp_fport;
 651         addr = inp->inp_faddr;
 652
 653 out:
 654         TCPDEBUG2(PRU_ACCEPT);
 655         INP_WUNLOCK(inp);
 656         INP_INFO_RUNLOCK(&V_tcbinfo);
 657         if (error == 0)
 658                 *nam = in_sockaddr(port, &addr);
 659         return error;
 660 }
 661 #endif /* INET */
 662
 663 #ifdef INET6
 664 static int
 665 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 666 {
 667         struct inpcb *inp = NULL;
 668         int error = 0;
 669         struct tcpcb *tp = NULL;
 670         struct in_addr addr;
 671         struct in6_addr addr6;
 672         in_port_t port = 0;
 673         int v4 = 0;
 674         TCPDEBUG0;
 675
 676         if (so->so_state & SS_ISDISCONNECTED)
 677                 return (ECONNABORTED);
 678
 679         inp = sotoinpcb(so);
 680         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 681         INP_INFO_RLOCK(&V_tcbinfo);
 682         INP_WLOCK(inp);
 683         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 684                 error = ECONNABORTED;
 685                 goto out;
 686         }
 687         tp = intotcpcb(inp);
 688         TCPDEBUG1();
 689
 690         /*
 691          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 692          * copy the data of interest and defer the malloc until after we
 693          * release the lock.
 694          */
 695         if (inp->inp_vflag & INP_IPV4) {
 696                 v4 = 1;
 697                 port = inp->inp_fport;
 698                 addr = inp->inp_faddr;
 699         } else {
 700                 port = inp->inp_fport;
 701                 addr6 = inp->in6p_faddr;
 702         }
 703
 704 out:
 705         TCPDEBUG2(PRU_ACCEPT);
 706         INP_WUNLOCK(inp);
 707         INP_INFO_RUNLOCK(&V_tcbinfo);
 708         if (error == 0) {
 709                 if (v4)
 710                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 711                 else
 712                         *nam = in6_sockaddr(port, &addr6);
 713         }
 714         return error;
 715 }
 716 #endif /* INET6 */
 717
 718 /*
 719  * Mark the connection as being incapable of further output.
 720  */
 721 static int
 722 tcp_usr_shutdown(struct socket *so)
 723 {
 724         int error = 0;
 725         struct inpcb *inp;
 726         struct tcpcb *tp = NULL;
 727
 728         TCPDEBUG0;
 729         INP_INFO_WLOCK(&V_tcbinfo);
 730         inp = sotoinpcb(so);
 731         KASSERT(inp != NULL, ("inp == NULL"));
 732         INP_WLOCK(inp);
 733         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 734                 error = ECONNRESET;
 735                 goto out;
 736         }
 737         tp = intotcpcb(inp);
 738         TCPDEBUG1();
 739         socantsendmore(so);
 740         tcp_usrclosed(tp);
 741         if (!(inp->inp_flags & INP_DROPPED))
 742                 error = tcp_output(tp);
 743
 744 out:
 745         TCPDEBUG2(PRU_SHUTDOWN);
 746         INP_WUNLOCK(inp);
 747         INP_INFO_WUNLOCK(&V_tcbinfo);
 748
 749         return (error);
 750 }
 751
 752 /*
 753  * After a receive, possibly send window update to peer.
 754  */
 755 static int
 756 tcp_usr_rcvd(struct socket *so, int flags)
 757 {
 758         struct inpcb *inp;
 759         struct tcpcb *tp = NULL;
 760         int error = 0;
 761
 762         TCPDEBUG0;
 763         inp = sotoinpcb(so);
 764         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 765         INP_WLOCK(inp);
 766         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 767                 error = ECONNRESET;
 768                 goto out;
 769         }
 770         tp = intotcpcb(inp);
 771         TCPDEBUG1();
 772 #ifdef TCP_OFFLOAD
 773         if (tp->t_flags & TF_TOE)
 774                 tcp_offload_rcvd(tp);
 775         else
 776 #endif
 777         tcp_output(tp);
 778
 779 out:
 780         TCPDEBUG2(PRU_RCVD);
 781         INP_WUNLOCK(inp);
 782         return (error);
 783 }
 784
 785 /*
 786  * Do a send by putting data in output queue and updating urgent
 787  * marker if URG set.  Possibly send more data.  Unlike the other
 788  * pru_*() routines, the mbuf chains are our responsibility.  We
 789  * must either enqueue them or free them.  The other pru_* routines
 790  * generally are caller-frees.
 791  */
 792 static int
 793 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 794     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 795 {
 796         int error = 0;
 797         struct inpcb *inp;
 798         struct tcpcb *tp = NULL;
 799 #ifdef INET6
 800         int isipv6;
 801 #endif
 802         TCPDEBUG0;
 803
 804         /*
 805          * We require the pcbinfo lock if we will close the socket as part of
 806          * this call.
 807          */
 808         if (flags & PRUS_EOF)
 809                 INP_INFO_WLOCK(&V_tcbinfo);
 810         inp = sotoinpcb(so);
 811         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 812         INP_WLOCK(inp);
 813         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 814                 if (control)
 815                         m_freem(control);
 816                 if (m)
 817                         m_freem(m);
 818                 error = ECONNRESET;
 819                 goto out;
 820         }
 821 #ifdef INET6
 822         isipv6 = nam && nam->sa_family == AF_INET6;
 823 #endif /* INET6 */
 824         tp = intotcpcb(inp);
 825         TCPDEBUG1();
 826         if (control) {
 827                 /* TCP doesn't do control messages (rights, creds, etc) */
 828                 if (control->m_len) {
 829                         m_freem(control);
 830                         if (m)
 831                                 m_freem(m);
 832                         error = EINVAL;
 833                         goto out;
 834                 }
 835                 m_freem(control);       /* empty control, just free it */
 836         }
 837         if (!(flags & PRUS_OOB)) {
 838                 sbappendstream(&so->so_snd, m);
 839                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 840                         /*
 841                          * Do implied connect if not yet connected,
 842                          * initialize window to default value, and
 843                          * initialize maxseg/maxopd using peer's cached
 844                          * MSS.
 845                          */
 846 #ifdef INET6
 847                         if (isipv6)
 848                                 error = tcp6_connect(tp, nam, td);
 849 #endif /* INET6 */
 850 #if defined(INET6) && defined(INET)
 851                         else
 852 #endif
 853 #ifdef INET
 854                                 error = tcp_connect(tp, nam, td);
 855 #endif
 856                         if (error)
 857                                 goto out;
 858                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 859                         tcp_mss(tp, -1);
 860                 }
 861                 if (flags & PRUS_EOF) {
 862                         /*
 863                          * Close the send side of the connection after
 864                          * the data is sent.
 865                          */
 866                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 867                         socantsendmore(so);
 868                         tcp_usrclosed(tp);
 869                 }
 870                 if (!(inp->inp_flags & INP_DROPPED)) {
 871                         if (flags & PRUS_MORETOCOME)
 872                                 tp->t_flags |= TF_MORETOCOME;
 873                         error = tcp_output(tp);
 874                         if (flags & PRUS_MORETOCOME)
 875                                 tp->t_flags &= ~TF_MORETOCOME;
 876                 }
 877         } else {
 878                 /*
 879                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 880                  */
 881                 SOCKBUF_LOCK(&so->so_snd);
 882                 if (sbspace(&so->so_snd) < -512) {
 883                         SOCKBUF_UNLOCK(&so->so_snd);
 884                         m_freem(m);
 885                         error = ENOBUFS;
 886                         goto out;
 887                 }
 888                 /*
 889                  * According to RFC961 (Assigned Protocols),
 890                  * the urgent pointer points to the last octet
 891                  * of urgent data.  We continue, however,
 892                  * to consider it to indicate the first octet
 893                  * of data past the urgent section.
 894                  * Otherwise, snd_up should be one lower.
 895                  */
 896                 sbappendstream_locked(&so->so_snd, m);
 897                 SOCKBUF_UNLOCK(&so->so_snd);
 898                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 899                         /*
 900                          * Do implied connect if not yet connected,
 901                          * initialize window to default value, and
 902                          * initialize maxseg/maxopd using peer's cached
 903                          * MSS.
 904                          */
 905 #ifdef INET6
 906                         if (isipv6)
 907                                 error = tcp6_connect(tp, nam, td);
 908 #endif /* INET6 */
 909 #if defined(INET6) && defined(INET)
 910                         else
 911 #endif
 912 #ifdef INET
 913                                 error = tcp_connect(tp, nam, td);
 914 #endif
 915                         if (error)
 916                                 goto out;
 917                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 918                         tcp_mss(tp, -1);
 919                 }
 920                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 921                 tp->t_flags |= TF_FORCEDATA;
 922                 error = tcp_output(tp);
 923                 tp->t_flags &= ~TF_FORCEDATA;
 924         }
 925 out:
 926         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
 927                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 928         INP_WUNLOCK(inp);
 929         if (flags & PRUS_EOF)
 930                 INP_INFO_WUNLOCK(&V_tcbinfo);
 931         return (error);
 932 }
 933
 934 /*
 935  * Abort the TCP.  Drop the connection abruptly.
 936  */
 937 static void
 938 tcp_usr_abort(struct socket *so)
 939 {
 940         struct inpcb *inp;
 941         struct tcpcb *tp = NULL;
 942         TCPDEBUG0;
 943
 944         inp = sotoinpcb(so);
 945         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
 946
 947         INP_INFO_WLOCK(&V_tcbinfo);
 948         INP_WLOCK(inp);
 949         KASSERT(inp->inp_socket != NULL,
 950             ("tcp_usr_abort: inp_socket == NULL"));
 951
 952         /*
 953          * If we still have full TCP state, and we're not dropped, drop.
 954          */
 955         if (!(inp->inp_flags & INP_TIMEWAIT) &&
 956             !(inp->inp_flags & INP_DROPPED)) {
 957                 tp = intotcpcb(inp);
 958                 TCPDEBUG1();
 959                 tcp_drop(tp, ECONNABORTED);
 960                 TCPDEBUG2(PRU_ABORT);
 961         }
 962         if (!(inp->inp_flags & INP_DROPPED)) {
 963                 SOCK_LOCK(so);
 964                 so->so_state |= SS_PROTOREF;
 965                 SOCK_UNLOCK(so);
 966                 inp->inp_flags |= INP_SOCKREF;
 967         }
 968         INP_WUNLOCK(inp);
 969         INP_INFO_WUNLOCK(&V_tcbinfo);
 970 }
 971
 972 /*
 973  * TCP socket is closed.  Start friendly disconnect.
 974  */
 975 static void
 976 tcp_usr_close(struct socket *so)
 977 {
 978         struct inpcb *inp;
 979         struct tcpcb *tp = NULL;
 980         TCPDEBUG0;
 981
 982         inp = sotoinpcb(so);
 983         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
 984
 985         INP_INFO_WLOCK(&V_tcbinfo);
 986         INP_WLOCK(inp);
 987         KASSERT(inp->inp_socket != NULL,
 988             ("tcp_usr_close: inp_socket == NULL"));
 989
 990         /*
 991          * If we still have full TCP state, and we're not dropped, initiate
 992          * a disconnect.
 993          */
 994         if (!(inp->inp_flags & INP_TIMEWAIT) &&
 995             !(inp->inp_flags & INP_DROPPED)) {
 996                 tp = intotcpcb(inp);
 997                 TCPDEBUG1();
 998                 tcp_disconnect(tp);
 999                 TCPDEBUG2(PRU_CLOSE);
1000         }
1001         if (!(inp->inp_flags & INP_DROPPED)) {
1002                 SOCK_LOCK(so);
1003                 so->so_state |= SS_PROTOREF;
1004                 SOCK_UNLOCK(so);
1005                 inp->inp_flags |= INP_SOCKREF;
1006         }
1007         INP_WUNLOCK(inp);
1008         INP_INFO_WUNLOCK(&V_tcbinfo);
1009 }
1010
1011 /*
1012  * Receive out-of-band data.
1013  */
1014 static int
1015 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1016 {
1017         int error = 0;
1018         struct inpcb *inp;
1019         struct tcpcb *tp = NULL;
1020
1021         TCPDEBUG0;
1022         inp = sotoinpcb(so);
1023         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1024         INP_WLOCK(inp);
1025         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1026                 error = ECONNRESET;
1027                 goto out;
1028         }
1029         tp = intotcpcb(inp);
1030         TCPDEBUG1();
1031         if ((so->so_oobmark == 0 &&
1032              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1033             so->so_options & SO_OOBINLINE ||
1034             tp->t_oobflags & TCPOOB_HADDATA) {
1035                 error = EINVAL;
1036                 goto out;
1037         }
1038         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1039                 error = EWOULDBLOCK;
1040                 goto out;
1041         }
1042         m->m_len = 1;
1043         *mtod(m, caddr_t) = tp->t_iobc;
1044         if ((flags & MSG_PEEK) == 0)
1045                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1046
1047 out:
1048         TCPDEBUG2(PRU_RCVOOB);
1049         INP_WUNLOCK(inp);
1050         return (error);
1051 }
1052
1053 #ifdef INET
1054 struct pr_usrreqs tcp_usrreqs = {
1055         .pru_abort =            tcp_usr_abort,
1056         .pru_accept =           tcp_usr_accept,
1057         .pru_attach =           tcp_usr_attach,
1058         .pru_bind =             tcp_usr_bind,
1059         .pru_connect =          tcp_usr_connect,
1060         .pru_control =          in_control,
1061         .pru_detach =           tcp_usr_detach,
1062         .pru_disconnect =       tcp_usr_disconnect,
1063         .pru_listen =           tcp_usr_listen,
1064         .pru_peeraddr =         in_getpeeraddr,
1065         .pru_rcvd =             tcp_usr_rcvd,
1066         .pru_rcvoob =           tcp_usr_rcvoob,
1067         .pru_send =             tcp_usr_send,
1068         .pru_shutdown =         tcp_usr_shutdown,
1069         .pru_sockaddr =         in_getsockaddr,
1070         .pru_sosetlabel =       in_pcbsosetlabel,
1071         .pru_close =            tcp_usr_close,
1072 };
1073 #endif /* INET */
1074
1075 #ifdef INET6
1076 struct pr_usrreqs tcp6_usrreqs = {
1077         .pru_abort =            tcp_usr_abort,
1078         .pru_accept =           tcp6_usr_accept,
1079         .pru_attach =           tcp_usr_attach,
1080         .pru_bind =             tcp6_usr_bind,
1081         .pru_connect =          tcp6_usr_connect,
1082         .pru_control =          in6_control,
1083         .pru_detach =           tcp_usr_detach,
1084         .pru_disconnect =       tcp_usr_disconnect,
1085         .pru_listen =           tcp6_usr_listen,
1086         .pru_peeraddr =         in6_mapped_peeraddr,
1087         .pru_rcvd =             tcp_usr_rcvd,
1088         .pru_rcvoob =           tcp_usr_rcvoob,
1089         .pru_send =             tcp_usr_send,
1090         .pru_shutdown =         tcp_usr_shutdown,
1091         .pru_sockaddr =         in6_mapped_sockaddr,
1092         .pru_sosetlabel =       in_pcbsosetlabel,
1093         .pru_close =            tcp_usr_close,
1094 };
1095 #endif /* INET6 */
1096
1097 #ifdef INET
1098 /*
1099  * Common subroutine to open a TCP connection to remote host specified
1100  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1101  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1102  * to choose a local host address (interface).  If there is an existing
1103  * incarnation of the same connection in TIME-WAIT state and if the remote
1104  * host was sending CC options and if the connection duration was < MSL, then
1105  * truncate the previous TIME-WAIT state and proceed.
1106  * Initialize connection parameters and enter SYN-SENT state.
1107  */
1108 static int
1109 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1110 {
1111         struct inpcb *inp = tp->t_inpcb, *oinp;
1112         struct socket *so = inp->inp_socket;
1113         struct in_addr laddr;
1114         u_short lport;
1115         int error;
1116
1117         INP_WLOCK_ASSERT(inp);
1118         INP_HASH_WLOCK(&V_tcbinfo);
1119
1120         if (inp->inp_lport == 0) {
1121                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1122                 if (error)
1123                         goto out;
1124         }
1125
1126         /*
1127          * Cannot simply call in_pcbconnect, because there might be an
1128          * earlier incarnation of this same connection still in
1129          * TIME_WAIT state, creating an ADDRINUSE error.
1130          */
1131         laddr = inp->inp_laddr;
1132         lport = inp->inp_lport;
1133         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1134             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1135         if (error && oinp == NULL)
1136                 goto out;
1137         if (oinp) {
1138                 error = EADDRINUSE;
1139                 goto out;
1140         }
1141         inp->inp_laddr = laddr;
1142         in_pcbrehash(inp);
1143         INP_HASH_WUNLOCK(&V_tcbinfo);
1144
1145         /*
1146          * Compute window scaling to request:
1147          * Scale to fit into sweet spot.  See tcp_syncache.c.
1148          * XXX: This should move to tcp_output().
1149          */
1150         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1151             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1152                 tp->request_r_scale++;
1153
1154         soisconnecting(so);
1155         TCPSTAT_INC(tcps_connattempt);
1156         tcp_state_change(tp, TCPS_SYN_SENT);
1157         tp->iss = tcp_new_isn(tp);
1158         tcp_sendseqinit(tp);
1159
1160         return 0;
1161
1162 out:
1163         INP_HASH_WUNLOCK(&V_tcbinfo);
1164         return (error);
1165 }
1166 #endif /* INET */
1167
1168 #ifdef INET6
1169 static int
1170 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1171 {
1172         struct inpcb *inp = tp->t_inpcb, *oinp;
1173         struct socket *so = inp->inp_socket;
1174         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1175         struct in6_addr addr6;
1176         int error;
1177
1178         INP_WLOCK_ASSERT(inp);
1179         INP_HASH_WLOCK(&V_tcbinfo);
1180
1181         if (inp->inp_lport == 0) {
1182                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1183                 if (error)
1184                         goto out;
1185         }
1186
1187         /*
1188          * Cannot simply call in_pcbconnect, because there might be an
1189          * earlier incarnation of this same connection still in
1190          * TIME_WAIT state, creating an ADDRINUSE error.
1191          * in6_pcbladdr() also handles scope zone IDs.
1192          *
1193          * XXXRW: We wouldn't need to expose in6_pcblookup_hash_locked()
1194          * outside of in6_pcb.c if there were an in6_pcbconnect_setup().
1195          */
1196         error = in6_pcbladdr(inp, nam, &addr6);
1197         if (error)
1198                 goto out;
1199         oinp = in6_pcblookup_hash_locked(inp->inp_pcbinfo,
1200                                   &sin6->sin6_addr, sin6->sin6_port,
1201                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1202                                   ? &addr6
1203                                   : &inp->in6p_laddr,
1204                                   inp->inp_lport,  0, NULL);
1205         if (oinp) {
1206                 error = EADDRINUSE;
1207                 goto out;
1208         }
1209         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1210                 inp->in6p_laddr = addr6;
1211         inp->in6p_faddr = sin6->sin6_addr;
1212         inp->inp_fport = sin6->sin6_port;
1213         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1214         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1215         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
1216                 inp->inp_flow |=
1217                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1218         in_pcbrehash(inp);
1219         INP_HASH_WUNLOCK(&V_tcbinfo);
1220
1221         /* Compute window scaling to request.  */
1222         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1223             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1224                 tp->request_r_scale++;
1225
1226         soisconnecting(so);
1227         TCPSTAT_INC(tcps_connattempt);
1228         tcp_state_change(tp, TCPS_SYN_SENT);
1229         tp->iss = tcp_new_isn(tp);
1230         tcp_sendseqinit(tp);
1231
1232         return 0;
1233
1234 out:
1235         INP_HASH_WUNLOCK(&V_tcbinfo);
1236         return error;
1237 }
1238 #endif /* INET6 */
1239
1240 /*
1241  * Export TCP internal state information via a struct tcp_info, based on the
1242  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1243  * (TCP state machine, etc).  We export all information using FreeBSD-native
1244  * constants -- for example, the numeric values for tcpi_state will differ
1245  * from Linux.
1246  */
1247 static void
1248 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1249 {
1250
1251         INP_WLOCK_ASSERT(tp->t_inpcb);
1252         bzero(ti, sizeof(*ti));
1253
1254         ti->tcpi_state = tp->t_state;
1255         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1256                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1257         if (tp->t_flags & TF_SACK_PERMIT)
1258                 ti->tcpi_options |= TCPI_OPT_SACK;
1259         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1260                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1261                 ti->tcpi_snd_wscale = tp->snd_scale;
1262                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1263         }
1264
1265         ti->tcpi_rto = tp->t_rxtcur * tick;
1266         ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
1267         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1268         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1269
1270         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1271         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1272
1273         /*
1274          * FreeBSD-specific extension fields for tcp_info.
1275          */
1276         ti->tcpi_rcv_space = tp->rcv_wnd;
1277         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1278         ti->tcpi_snd_wnd = tp->snd_wnd;
1279         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1280         ti->tcpi_snd_nxt = tp->snd_nxt;
1281         ti->tcpi_snd_mss = tp->t_maxseg;
1282         ti->tcpi_rcv_mss = tp->t_maxseg;
1283         if (tp->t_flags & TF_TOE)
1284                 ti->tcpi_options |= TCPI_OPT_TOE;
1285         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1286         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1287         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1288 }
1289
1290 /*
1291  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1292  * socket option arguments.  When it re-acquires the lock after the copy, it
1293  * has to revalidate that the connection is still valid for the socket
1294  * option.
1295  */
1296 #define INP_WLOCK_RECHECK(inp) do {                                     \
1297         INP_WLOCK(inp);                                                 \
1298         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1299                 INP_WUNLOCK(inp);                                       \
1300                 return (ECONNRESET);                                    \
1301         }                                                               \
1302         tp = intotcpcb(inp);                                            \
1303 } while(0)
1304
1305 int
1306 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1307 {
1308         int     error, opt, optval;
1309         u_int   ui;
1310         struct  inpcb *inp;
1311         struct  tcpcb *tp;
1312         struct  tcp_info ti;
1313         char buf[TCP_CA_NAME_MAX];
1314         struct cc_algo *algo;
1315
1316         error = 0;
1317         inp = sotoinpcb(so);
1318         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1319         INP_WLOCK(inp);
1320         if (sopt->sopt_level != IPPROTO_TCP) {
1321 #ifdef INET6
1322                 if (inp->inp_vflag & INP_IPV6PROTO) {
1323                         INP_WUNLOCK(inp);
1324                         error = ip6_ctloutput(so, sopt);
1325                 }
1326 #endif /* INET6 */
1327 #if defined(INET6) && defined(INET)
1328                 else
1329 #endif
1330 #ifdef INET
1331                 {
1332                         INP_WUNLOCK(inp);
1333                         error = ip_ctloutput(so, sopt);
1334                 }
1335 #endif
1336                 return (error);
1337         }
1338         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1339                 INP_WUNLOCK(inp);
1340                 return (ECONNRESET);
1341         }
1342
1343         switch (sopt->sopt_dir) {
1344         case SOPT_SET:
1345                 switch (sopt->sopt_name) {
1346 #ifdef TCP_SIGNATURE
1347                 case TCP_MD5SIG:
1348                         INP_WUNLOCK(inp);
1349                         error = sooptcopyin(sopt, &optval, sizeof optval,
1350                             sizeof optval);
1351                         if (error)
1352                                 return (error);
1353
1354                         INP_WLOCK_RECHECK(inp);
1355                         if (optval > 0)
1356                                 tp->t_flags |= TF_SIGNATURE;
1357                         else
1358                                 tp->t_flags &= ~TF_SIGNATURE;
1359                         goto unlock_and_done;
1360 #endif /* TCP_SIGNATURE */
1361
1362                 case TCP_NODELAY:
1363                 case TCP_NOOPT:
1364                         INP_WUNLOCK(inp);
1365                         error = sooptcopyin(sopt, &optval, sizeof optval,
1366                             sizeof optval);
1367                         if (error)
1368                                 return (error);
1369
1370                         INP_WLOCK_RECHECK(inp);
1371                         switch (sopt->sopt_name) {
1372                         case TCP_NODELAY:
1373                                 opt = TF_NODELAY;
1374                                 break;
1375                         case TCP_NOOPT:
1376                                 opt = TF_NOOPT;
1377                                 break;
1378                         default:
1379                                 opt = 0; /* dead code to fool gcc */
1380                                 break;
1381                         }
1382
1383                         if (optval)
1384                                 tp->t_flags |= opt;
1385                         else
1386                                 tp->t_flags &= ~opt;
1387 unlock_and_done:
1388 #ifdef TCP_OFFLOAD
1389                         if (tp->t_flags & TF_TOE) {
1390                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1391                                     sopt->sopt_name);
1392                         }
1393 #endif
1394                         INP_WUNLOCK(inp);
1395                         break;
1396
1397                 case TCP_NOPUSH:
1398                         INP_WUNLOCK(inp);
1399                         error = sooptcopyin(sopt, &optval, sizeof optval,
1400                             sizeof optval);
1401                         if (error)
1402                                 return (error);
1403
1404                         INP_WLOCK_RECHECK(inp);
1405                         if (optval)
1406                                 tp->t_flags |= TF_NOPUSH;
1407                         else if (tp->t_flags & TF_NOPUSH) {
1408                                 tp->t_flags &= ~TF_NOPUSH;
1409                                 if (TCPS_HAVEESTABLISHED(tp->t_state))
1410                                         error = tcp_output(tp);
1411                         }
1412                         goto unlock_and_done;
1413
1414                 case TCP_MAXSEG:
1415                         INP_WUNLOCK(inp);
1416                         error = sooptcopyin(sopt, &optval, sizeof optval,
1417                             sizeof optval);
1418                         if (error)
1419                                 return (error);
1420
1421                         INP_WLOCK_RECHECK(inp);
1422                         if (optval > 0 && optval <= tp->t_maxseg &&
1423                             optval + 40 >= V_tcp_minmss)
1424                                 tp->t_maxseg = optval;
1425                         else
1426                                 error = EINVAL;
1427                         goto unlock_and_done;
1428
1429                 case TCP_INFO:
1430                         INP_WUNLOCK(inp);
1431                         error = EINVAL;
1432                         break;
1433
1434                 case TCP_CONGESTION:
1435                         INP_WUNLOCK(inp);
1436                         bzero(buf, sizeof(buf));
1437                         error = sooptcopyin(sopt, &buf, sizeof(buf), 1);
1438                         if (error)
1439                                 break;
1440                         INP_WLOCK_RECHECK(inp);
1441                         /*
1442                          * Return EINVAL if we can't find the requested cc algo.
1443                          */
1444                         error = EINVAL;
1445                         CC_LIST_RLOCK();
1446                         STAILQ_FOREACH(algo, &cc_list, entries) {
1447                                 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX)
1448                                     == 0) {
1449                                         /* We've found the requested algo. */
1450                                         error = 0;
1451                                         /*
1452                                          * We hold a write lock over the tcb
1453                                          * so it's safe to do these things
1454                                          * without ordering concerns.
1455                                          */
1456                                         if (CC_ALGO(tp)->cb_destroy != NULL)
1457                                                 CC_ALGO(tp)->cb_destroy(tp->ccv);
1458                                         CC_ALGO(tp) = algo;
1459                                         /*
1460                                          * If something goes pear shaped
1461                                          * initialising the new algo,
1462                                          * fall back to newreno (which
1463                                          * does not require initialisation).
1464                                          */
1465                                         if (algo->cb_init != NULL)
1466                                                 if (algo->cb_init(tp->ccv) > 0) {
1467                                                         CC_ALGO(tp) = &newreno_cc_algo;
1468                                                         /*
1469                                                          * The only reason init
1470                                                          * should fail is
1471                                                          * because of malloc.
1472                                                          */
1473                                                         error = ENOMEM;
1474                                                 }
1475                                         break; /* Break the STAILQ_FOREACH. */
1476                                 }
1477                         }
1478                         CC_LIST_RUNLOCK();
1479                         goto unlock_and_done;
1480
1481                 case TCP_KEEPIDLE:
1482                 case TCP_KEEPINTVL:
1483                 case TCP_KEEPINIT:
1484                         INP_WUNLOCK(inp);
1485                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1486                         if (error)
1487                                 return (error);
1488
1489                         if (ui > (UINT_MAX / hz)) {
1490                                 error = EINVAL;
1491                                 break;
1492                         }
1493                         ui *= hz;
1494
1495                         INP_WLOCK_RECHECK(inp);
1496                         switch (sopt->sopt_name) {
1497                         case TCP_KEEPIDLE:
1498                                 tp->t_keepidle = ui;
1499                                 /*
1500                                  * XXX: better check current remaining
1501                                  * timeout and "merge" it with new value.
1502                                  */
1503                                 if ((tp->t_state > TCPS_LISTEN) &&
1504                                     (tp->t_state <= TCPS_CLOSING))
1505                                         tcp_timer_activate(tp, TT_KEEP,
1506                                             TP_KEEPIDLE(tp));
1507                                 break;
1508                         case TCP_KEEPINTVL:
1509                                 tp->t_keepintvl = ui;
1510                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1511                                     (TP_MAXIDLE(tp) > 0))
1512                                         tcp_timer_activate(tp, TT_2MSL,
1513                                             TP_MAXIDLE(tp));
1514                                 break;
1515                         case TCP_KEEPINIT:
1516                                 tp->t_keepinit = ui;
1517                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
1518                                     tp->t_state == TCPS_SYN_SENT)
1519                                         tcp_timer_activate(tp, TT_KEEP,
1520                                             TP_KEEPINIT(tp));
1521                                 break;
1522                         }
1523                         goto unlock_and_done;
1524
1525                 case TCP_KEEPCNT:
1526                         INP_WUNLOCK(inp);
1527                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1528                         if (error)
1529                                 return (error);
1530
1531                         INP_WLOCK_RECHECK(inp);
1532                         tp->t_keepcnt = ui;
1533                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1534                             (TP_MAXIDLE(tp) > 0))
1535                                 tcp_timer_activate(tp, TT_2MSL,
1536                                     TP_MAXIDLE(tp));
1537                         goto unlock_and_done;
1538
1539                 default:
1540                         INP_WUNLOCK(inp);
1541                         error = ENOPROTOOPT;
1542                         break;
1543                 }
1544                 break;
1545
1546         case SOPT_GET:
1547                 tp = intotcpcb(inp);
1548                 switch (sopt->sopt_name) {
1549 #ifdef TCP_SIGNATURE
1550                 case TCP_MD5SIG:
1551                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1552                         INP_WUNLOCK(inp);
1553                         error = sooptcopyout(sopt, &optval, sizeof optval);
1554                         break;
1555 #endif
1556
1557                 case TCP_NODELAY:
1558                         optval = tp->t_flags & TF_NODELAY;
1559                         INP_WUNLOCK(inp);
1560                         error = sooptcopyout(sopt, &optval, sizeof optval);
1561                         break;
1562                 case TCP_MAXSEG:
1563                         optval = tp->t_maxseg;
1564                         INP_WUNLOCK(inp);
1565                         error = sooptcopyout(sopt, &optval, sizeof optval);
1566                         break;
1567                 case TCP_NOOPT:
1568                         optval = tp->t_flags & TF_NOOPT;
1569                         INP_WUNLOCK(inp);
1570                         error = sooptcopyout(sopt, &optval, sizeof optval);
1571                         break;
1572                 case TCP_NOPUSH:
1573                         optval = tp->t_flags & TF_NOPUSH;
1574                         INP_WUNLOCK(inp);
1575                         error = sooptcopyout(sopt, &optval, sizeof optval);
1576                         break;
1577                 case TCP_INFO:
1578                         tcp_fill_info(tp, &ti);
1579                         INP_WUNLOCK(inp);
1580                         error = sooptcopyout(sopt, &ti, sizeof ti);
1581                         break;
1582                 case TCP_CONGESTION:
1583                         bzero(buf, sizeof(buf));
1584                         strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
1585                         INP_WUNLOCK(inp);
1586                         error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX);
1587                         break;
1588                 default:
1589                         INP_WUNLOCK(inp);
1590                         error = ENOPROTOOPT;
1591                         break;
1592                 }
1593                 break;
1594         }
1595         return (error);
1596 }
1597 #undef INP_WLOCK_RECHECK
1598
1599 /*
1600  * Attach TCP protocol to socket, allocating
1601  * internet protocol control block, tcp control block,
1602  * bufer space, and entering LISTEN state if to accept connections.
1603  */
1604 static int
1605 tcp_attach(struct socket *so)
1606 {
1607         struct tcpcb *tp;
1608         struct inpcb *inp;
1609         int error;
1610
1611         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1612                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
1613                 if (error)
1614                         return (error);
1615         }
1616         so->so_rcv.sb_flags |= SB_AUTOSIZE;
1617         so->so_snd.sb_flags |= SB_AUTOSIZE;
1618         INP_INFO_WLOCK(&V_tcbinfo);
1619         error = in_pcballoc(so, &V_tcbinfo);
1620         if (error) {
1621                 INP_INFO_WUNLOCK(&V_tcbinfo);
1622                 return (error);
1623         }
1624         inp = sotoinpcb(so);
1625 #ifdef INET6
1626         if (inp->inp_vflag & INP_IPV6PROTO) {
1627                 inp->inp_vflag |= INP_IPV6;
1628                 inp->in6p_hops = -1;    /* use kernel default */
1629         }
1630         else
1631 #endif
1632         inp->inp_vflag |= INP_IPV4;
1633         tp = tcp_newtcpcb(inp);
1634         if (tp == NULL) {
1635                 in_pcbdetach(inp);
1636                 in_pcbfree(inp);
1637                 INP_INFO_WUNLOCK(&V_tcbinfo);
1638                 return (ENOBUFS);
1639         }
1640         tp->t_state = TCPS_CLOSED;
1641         INP_WUNLOCK(inp);
1642         INP_INFO_WUNLOCK(&V_tcbinfo);
1643         return (0);
1644 }
1645
1646 /*
1647  * Initiate (or continue) disconnect.
1648  * If embryonic state, just send reset (once).
1649  * If in ``let data drain'' option and linger null, just drop.
1650  * Otherwise (hard), mark socket disconnecting and drop
1651  * current input data; switch states based on user close, and
1652  * send segment to peer (with FIN).
1653  */
1654 static void
1655 tcp_disconnect(struct tcpcb *tp)
1656 {
1657         struct inpcb *inp = tp->t_inpcb;
1658         struct socket *so = inp->inp_socket;
1659
1660         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1661         INP_WLOCK_ASSERT(inp);
1662
1663         /*
1664          * Neither tcp_close() nor tcp_drop() should return NULL, as the
1665          * socket is still open.
1666          */
1667         if (tp->t_state < TCPS_ESTABLISHED) {
1668                 tp = tcp_close(tp);
1669                 KASSERT(tp != NULL,
1670                     ("tcp_disconnect: tcp_close() returned NULL"));
1671         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1672                 tp = tcp_drop(tp, 0);
1673                 KASSERT(tp != NULL,
1674                     ("tcp_disconnect: tcp_drop() returned NULL"));
1675         } else {
1676                 soisdisconnecting(so);
1677                 sbflush(&so->so_rcv);
1678                 tcp_usrclosed(tp);
1679                 if (!(inp->inp_flags & INP_DROPPED))
1680                         tcp_output(tp);
1681         }
1682 }
1683
1684 /*
1685  * User issued close, and wish to trail through shutdown states:
1686  * if never received SYN, just forget it.  If got a SYN from peer,
1687  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1688  * If already got a FIN from peer, then almost done; go to LAST_ACK
1689  * state.  In all other cases, have already sent FIN to peer (e.g.
1690  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1691  * for peer to send FIN or not respond to keep-alives, etc.
1692  * We can let the user exit from the close as soon as the FIN is acked.
1693  */
1694 static void
1695 tcp_usrclosed(struct tcpcb *tp)
1696 {
1697
1698         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1699         INP_WLOCK_ASSERT(tp->t_inpcb);
1700
1701         switch (tp->t_state) {
1702         case TCPS_LISTEN:
1703 #ifdef TCP_OFFLOAD
1704                 tcp_offload_listen_stop(tp);
1705 #endif
1706                 /* FALLTHROUGH */
1707         case TCPS_CLOSED:
1708                 tcp_state_change(tp, TCPS_CLOSED);
1709                 tp = tcp_close(tp);
1710                 /*
1711                  * tcp_close() should never return NULL here as the socket is
1712                  * still open.
1713                  */
1714                 KASSERT(tp != NULL,
1715                     ("tcp_usrclosed: tcp_close() returned NULL"));
1716                 break;
1717
1718         case TCPS_SYN_SENT:
1719         case TCPS_SYN_RECEIVED:
1720                 tp->t_flags |= TF_NEEDFIN;
1721                 break;
1722
1723         case TCPS_ESTABLISHED:
1724                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
1725                 break;
1726
1727         case TCPS_CLOSE_WAIT:
1728                 tcp_state_change(tp, TCPS_LAST_ACK);
1729                 break;
1730         }
1731         if (tp->t_state >= TCPS_FIN_WAIT_2) {
1732                 soisdisconnected(tp->t_inpcb->inp_socket);
1733                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1734                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1735                         int timeout;
1736
1737                         timeout = (tcp_fast_finwait2_recycle) ?
1738                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
1739                         tcp_timer_activate(tp, TT_2MSL, timeout);
1740                 }
1741         }
1742 }
1743
1744 #ifdef DDB
1745 static void
1746 db_print_indent(int indent)
1747 {
1748         int i;
1749
1750         for (i = 0; i < indent; i++)
1751                 db_printf(" ");
1752 }
1753
1754 static void
1755 db_print_tstate(int t_state)
1756 {
1757
1758         switch (t_state) {
1759         case TCPS_CLOSED:
1760                 db_printf("TCPS_CLOSED");
1761                 return;
1762
1763         case TCPS_LISTEN:
1764                 db_printf("TCPS_LISTEN");
1765                 return;
1766
1767         case TCPS_SYN_SENT:
1768                 db_printf("TCPS_SYN_SENT");
1769                 return;
1770
1771         case TCPS_SYN_RECEIVED:
1772                 db_printf("TCPS_SYN_RECEIVED");
1773                 return;
1774
1775         case TCPS_ESTABLISHED:
1776                 db_printf("TCPS_ESTABLISHED");
1777                 return;
1778
1779         case TCPS_CLOSE_WAIT:
1780                 db_printf("TCPS_CLOSE_WAIT");
1781                 return;
1782
1783         case TCPS_FIN_WAIT_1:
1784                 db_printf("TCPS_FIN_WAIT_1");
1785                 return;
1786
1787         case TCPS_CLOSING:
1788                 db_printf("TCPS_CLOSING");
1789                 return;
1790
1791         case TCPS_LAST_ACK:
1792                 db_printf("TCPS_LAST_ACK");
1793                 return;
1794
1795         case TCPS_FIN_WAIT_2:
1796                 db_printf("TCPS_FIN_WAIT_2");
1797                 return;
1798
1799         case TCPS_TIME_WAIT:
1800                 db_printf("TCPS_TIME_WAIT");
1801                 return;
1802
1803         default:
1804                 db_printf("unknown");
1805                 return;
1806         }
1807 }
1808
1809 static void
1810 db_print_tflags(u_int t_flags)
1811 {
1812         int comma;
1813
1814         comma = 0;
1815         if (t_flags & TF_ACKNOW) {
1816                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1817                 comma = 1;
1818         }
1819         if (t_flags & TF_DELACK) {
1820                 db_printf("%sTF_DELACK", comma ? ", " : "");
1821                 comma = 1;
1822         }
1823         if (t_flags & TF_NODELAY) {
1824                 db_printf("%sTF_NODELAY", comma ? ", " : "");
1825                 comma = 1;
1826         }
1827         if (t_flags & TF_NOOPT) {
1828                 db_printf("%sTF_NOOPT", comma ? ", " : "");
1829                 comma = 1;
1830         }
1831         if (t_flags & TF_SENTFIN) {
1832                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1833                 comma = 1;
1834         }
1835         if (t_flags & TF_REQ_SCALE) {
1836                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1837                 comma = 1;
1838         }
1839         if (t_flags & TF_RCVD_SCALE) {
1840                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1841                 comma = 1;
1842         }
1843         if (t_flags & TF_REQ_TSTMP) {
1844                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1845                 comma = 1;
1846         }
1847         if (t_flags & TF_RCVD_TSTMP) {
1848                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1849                 comma = 1;
1850         }
1851         if (t_flags & TF_SACK_PERMIT) {
1852                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1853                 comma = 1;
1854         }
1855         if (t_flags & TF_NEEDSYN) {
1856                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1857                 comma = 1;
1858         }
1859         if (t_flags & TF_NEEDFIN) {
1860                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1861                 comma = 1;
1862         }
1863         if (t_flags & TF_NOPUSH) {
1864                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1865                 comma = 1;
1866         }
1867         if (t_flags & TF_MORETOCOME) {
1868                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1869                 comma = 1;
1870         }
1871         if (t_flags & TF_LQ_OVERFLOW) {
1872                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1873                 comma = 1;
1874         }
1875         if (t_flags & TF_LASTIDLE) {
1876                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1877                 comma = 1;
1878         }
1879         if (t_flags & TF_RXWIN0SENT) {
1880                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1881                 comma = 1;
1882         }
1883         if (t_flags & TF_FASTRECOVERY) {
1884                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1885                 comma = 1;
1886         }
1887         if (t_flags & TF_CONGRECOVERY) {
1888                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
1889                 comma = 1;
1890         }
1891         if (t_flags & TF_WASFRECOVERY) {
1892                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1893                 comma = 1;
1894         }
1895         if (t_flags & TF_SIGNATURE) {
1896                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1897                 comma = 1;
1898         }
1899         if (t_flags & TF_FORCEDATA) {
1900                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1901                 comma = 1;
1902         }
1903         if (t_flags & TF_TSO) {
1904                 db_printf("%sTF_TSO", comma ? ", " : "");
1905                 comma = 1;
1906         }
1907         if (t_flags & TF_ECN_PERMIT) {
1908                 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
1909                 comma = 1;
1910         }
1911 }
1912
1913 static void
1914 db_print_toobflags(char t_oobflags)
1915 {
1916         int comma;
1917
1918         comma = 0;
1919         if (t_oobflags & TCPOOB_HAVEDATA) {
1920                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1921                 comma = 1;
1922         }
1923         if (t_oobflags & TCPOOB_HADDATA) {
1924                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1925                 comma = 1;
1926         }
1927 }
1928
1929 static void
1930 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1931 {
1932
1933         db_print_indent(indent);
1934         db_printf("%s at %p\n", name, tp);
1935
1936         indent += 2;
1937
1938         db_print_indent(indent);
1939         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
1940            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
1941
1942         db_print_indent(indent);
1943         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
1944             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1945
1946         db_print_indent(indent);
1947         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1948             &tp->t_timers->tt_delack, tp->t_inpcb);
1949
1950         db_print_indent(indent);
1951         db_printf("t_state: %d (", tp->t_state);
1952         db_print_tstate(tp->t_state);
1953         db_printf(")\n");
1954
1955         db_print_indent(indent);
1956         db_printf("t_flags: 0x%x (", tp->t_flags);
1957         db_print_tflags(tp->t_flags);
1958         db_printf(")\n");
1959
1960         db_print_indent(indent);
1961         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
1962             tp->snd_una, tp->snd_max, tp->snd_nxt);
1963
1964         db_print_indent(indent);
1965         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
1966            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1967
1968         db_print_indent(indent);
1969         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
1970             tp->iss, tp->irs, tp->rcv_nxt);
1971
1972         db_print_indent(indent);
1973         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
1974             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1975
1976         db_print_indent(indent);
1977         db_printf("snd_wnd: %lu   snd_cwnd: %lu\n",
1978            tp->snd_wnd, tp->snd_cwnd);
1979
1980         db_print_indent(indent);
1981         db_printf("snd_ssthresh: %lu   snd_recover: "
1982             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
1983
1984         db_print_indent(indent);
1985         db_printf("t_maxopd: %u   t_rcvtime: %u   t_startime: %u\n",
1986             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1987
1988         db_print_indent(indent);
1989         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
1990             tp->t_rtttime, tp->t_rtseq);
1991
1992         db_print_indent(indent);
1993         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
1994             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
1995
1996         db_print_indent(indent);
1997         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
1998             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
1999             tp->t_rttbest);
2000
2001         db_print_indent(indent);
2002         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
2003             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2004
2005         db_print_indent(indent);
2006         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2007         db_print_toobflags(tp->t_oobflags);
2008         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
2009
2010         db_print_indent(indent);
2011         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
2012             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2013
2014         db_print_indent(indent);
2015         db_printf("ts_recent: %u   ts_recent_age: %u\n",
2016             tp->ts_recent, tp->ts_recent_age);
2017
2018         db_print_indent(indent);
2019         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
2020             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2021
2022         db_print_indent(indent);
2023         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
2024             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2025             tp->snd_recover_prev, tp->t_badrxtwin);
2026
2027         db_print_indent(indent);
2028         db_printf("snd_numholes: %d  snd_holes first: %p\n",
2029             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2030
2031         db_print_indent(indent);
2032         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
2033             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
2034
2035         /* Skip sackblks, sackhint. */
2036
2037         db_print_indent(indent);
2038         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
2039             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2040 }
2041
2042 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2043 {
2044         struct tcpcb *tp;
2045
2046         if (!have_addr) {
2047                 db_printf("usage: show tcpcb <addr>\n");
2048                 return;
2049         }
2050         tp = (struct tcpcb *)addr;
2051
2052         db_print_tcpcb(tp, "tcpcb", 0);
2053 }
2054 #endif