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 static int
 615 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
 616 {
 617         int error = 0;
 618         struct inpcb *inp = NULL;
 619         struct tcpcb *tp = NULL;
 620         struct in_addr addr;
 621         in_port_t port = 0;
 622         TCPDEBUG0;
 623
 624         if (so->so_state & SS_ISDISCONNECTED)
 625                 return (ECONNABORTED);
 626
 627         inp = sotoinpcb(so);
 628         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
 629         INP_WLOCK(inp);
 630         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 631                 error = ECONNABORTED;
 632                 goto out;
 633         }
 634         tp = intotcpcb(inp);
 635         TCPDEBUG1();
 636
 637         /*
 638          * We inline in_getpeeraddr and COMMON_END here, so that we can
 639          * copy the data of interest and defer the malloc until after we
 640          * release the lock.
 641          */
 642         port = inp->inp_fport;
 643         addr = inp->inp_faddr;
 644
 645 out:
 646         TCPDEBUG2(PRU_ACCEPT);
 647         INP_WUNLOCK(inp);
 648         if (error == 0)
 649                 *nam = in_sockaddr(port, &addr);
 650         return error;
 651 }
 652 #endif /* INET */
 653
 654 #ifdef INET6
 655 static int
 656 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
 657 {
 658         struct inpcb *inp = NULL;
 659         int error = 0;
 660         struct tcpcb *tp = NULL;
 661         struct in_addr addr;
 662         struct in6_addr addr6;
 663         in_port_t port = 0;
 664         int v4 = 0;
 665         TCPDEBUG0;
 666
 667         if (so->so_state & SS_ISDISCONNECTED)
 668                 return (ECONNABORTED);
 669
 670         inp = sotoinpcb(so);
 671         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
 672         INP_INFO_RLOCK(&V_tcbinfo);
 673         INP_WLOCK(inp);
 674         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 675                 error = ECONNABORTED;
 676                 goto out;
 677         }
 678         tp = intotcpcb(inp);
 679         TCPDEBUG1();
 680
 681         /*
 682          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
 683          * copy the data of interest and defer the malloc until after we
 684          * release the lock.
 685          */
 686         if (inp->inp_vflag & INP_IPV4) {
 687                 v4 = 1;
 688                 port = inp->inp_fport;
 689                 addr = inp->inp_faddr;
 690         } else {
 691                 port = inp->inp_fport;
 692                 addr6 = inp->in6p_faddr;
 693         }
 694
 695 out:
 696         TCPDEBUG2(PRU_ACCEPT);
 697         INP_WUNLOCK(inp);
 698         INP_INFO_RUNLOCK(&V_tcbinfo);
 699         if (error == 0) {
 700                 if (v4)
 701                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
 702                 else
 703                         *nam = in6_sockaddr(port, &addr6);
 704         }
 705         return error;
 706 }
 707 #endif /* INET6 */
 708
 709 /*
 710  * Mark the connection as being incapable of further output.
 711  */
 712 static int
 713 tcp_usr_shutdown(struct socket *so)
 714 {
 715         int error = 0;
 716         struct inpcb *inp;
 717         struct tcpcb *tp = NULL;
 718
 719         TCPDEBUG0;
 720         INP_INFO_WLOCK(&V_tcbinfo);
 721         inp = sotoinpcb(so);
 722         KASSERT(inp != NULL, ("inp == NULL"));
 723         INP_WLOCK(inp);
 724         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 725                 error = ECONNRESET;
 726                 goto out;
 727         }
 728         tp = intotcpcb(inp);
 729         TCPDEBUG1();
 730         socantsendmore(so);
 731         tcp_usrclosed(tp);
 732         if (!(inp->inp_flags & INP_DROPPED))
 733                 error = tcp_output(tp);
 734
 735 out:
 736         TCPDEBUG2(PRU_SHUTDOWN);
 737         INP_WUNLOCK(inp);
 738         INP_INFO_WUNLOCK(&V_tcbinfo);
 739
 740         return (error);
 741 }
 742
 743 /*
 744  * After a receive, possibly send window update to peer.
 745  */
 746 static int
 747 tcp_usr_rcvd(struct socket *so, int flags)
 748 {
 749         struct inpcb *inp;
 750         struct tcpcb *tp = NULL;
 751         int error = 0;
 752
 753         TCPDEBUG0;
 754         inp = sotoinpcb(so);
 755         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
 756         INP_WLOCK(inp);
 757         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 758                 error = ECONNRESET;
 759                 goto out;
 760         }
 761         tp = intotcpcb(inp);
 762         TCPDEBUG1();
 763 #ifdef TCP_OFFLOAD
 764         if (tp->t_flags & TF_TOE)
 765                 tcp_offload_rcvd(tp);
 766         else
 767 #endif
 768         tcp_output(tp);
 769
 770 out:
 771         TCPDEBUG2(PRU_RCVD);
 772         INP_WUNLOCK(inp);
 773         return (error);
 774 }
 775
 776 /*
 777  * Do a send by putting data in output queue and updating urgent
 778  * marker if URG set.  Possibly send more data.  Unlike the other
 779  * pru_*() routines, the mbuf chains are our responsibility.  We
 780  * must either enqueue them or free them.  The other pru_* routines
 781  * generally are caller-frees.
 782  */
 783 static int
 784 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
 785     struct sockaddr *nam, struct mbuf *control, struct thread *td)
 786 {
 787         int error = 0;
 788         struct inpcb *inp;
 789         struct tcpcb *tp = NULL;
 790 #ifdef INET6
 791         int isipv6;
 792 #endif
 793         TCPDEBUG0;
 794
 795         /*
 796          * We require the pcbinfo lock if we will close the socket as part of
 797          * this call.
 798          */
 799         if (flags & PRUS_EOF)
 800                 INP_INFO_WLOCK(&V_tcbinfo);
 801         inp = sotoinpcb(so);
 802         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
 803         INP_WLOCK(inp);
 804         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 805                 if (control)
 806                         m_freem(control);
 807                 if (m)
 808                         m_freem(m);
 809                 error = ECONNRESET;
 810                 goto out;
 811         }
 812 #ifdef INET6
 813         isipv6 = nam && nam->sa_family == AF_INET6;
 814 #endif /* INET6 */
 815         tp = intotcpcb(inp);
 816         TCPDEBUG1();
 817         if (control) {
 818                 /* TCP doesn't do control messages (rights, creds, etc) */
 819                 if (control->m_len) {
 820                         m_freem(control);
 821                         if (m)
 822                                 m_freem(m);
 823                         error = EINVAL;
 824                         goto out;
 825                 }
 826                 m_freem(control);       /* empty control, just free it */
 827         }
 828         if (!(flags & PRUS_OOB)) {
 829                 sbappendstream(&so->so_snd, m);
 830                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 831                         /*
 832                          * Do implied connect if not yet connected,
 833                          * initialize window to default value, and
 834                          * initialize maxseg/maxopd using peer's cached
 835                          * MSS.
 836                          */
 837 #ifdef INET6
 838                         if (isipv6)
 839                                 error = tcp6_connect(tp, nam, td);
 840 #endif /* INET6 */
 841 #if defined(INET6) && defined(INET)
 842                         else
 843 #endif
 844 #ifdef INET
 845                                 error = tcp_connect(tp, nam, td);
 846 #endif
 847                         if (error)
 848                                 goto out;
 849                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 850                         tcp_mss(tp, -1);
 851                 }
 852                 if (flags & PRUS_EOF) {
 853                         /*
 854                          * Close the send side of the connection after
 855                          * the data is sent.
 856                          */
 857                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 858                         socantsendmore(so);
 859                         tcp_usrclosed(tp);
 860                 }
 861                 if (!(inp->inp_flags & INP_DROPPED)) {
 862                         if (flags & PRUS_MORETOCOME)
 863                                 tp->t_flags |= TF_MORETOCOME;
 864                         error = tcp_output(tp);
 865                         if (flags & PRUS_MORETOCOME)
 866                                 tp->t_flags &= ~TF_MORETOCOME;
 867                 }
 868         } else {
 869                 /*
 870                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
 871                  */
 872                 SOCKBUF_LOCK(&so->so_snd);
 873                 if (sbspace(&so->so_snd) < -512) {
 874                         SOCKBUF_UNLOCK(&so->so_snd);
 875                         m_freem(m);
 876                         error = ENOBUFS;
 877                         goto out;
 878                 }
 879                 /*
 880                  * According to RFC961 (Assigned Protocols),
 881                  * the urgent pointer points to the last octet
 882                  * of urgent data.  We continue, however,
 883                  * to consider it to indicate the first octet
 884                  * of data past the urgent section.
 885                  * Otherwise, snd_up should be one lower.
 886                  */
 887                 sbappendstream_locked(&so->so_snd, m);
 888                 SOCKBUF_UNLOCK(&so->so_snd);
 889                 if (nam && tp->t_state < TCPS_SYN_SENT) {
 890                         /*
 891                          * Do implied connect if not yet connected,
 892                          * initialize window to default value, and
 893                          * initialize maxseg/maxopd using peer's cached
 894                          * MSS.
 895                          */
 896 #ifdef INET6
 897                         if (isipv6)
 898                                 error = tcp6_connect(tp, nam, td);
 899 #endif /* INET6 */
 900 #if defined(INET6) && defined(INET)
 901                         else
 902 #endif
 903 #ifdef INET
 904                                 error = tcp_connect(tp, nam, td);
 905 #endif
 906                         if (error)
 907                                 goto out;
 908                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
 909                         tcp_mss(tp, -1);
 910                 }
 911                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 912                 tp->t_flags |= TF_FORCEDATA;
 913                 error = tcp_output(tp);
 914                 tp->t_flags &= ~TF_FORCEDATA;
 915         }
 916 out:
 917         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
 918                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
 919         INP_WUNLOCK(inp);
 920         if (flags & PRUS_EOF)
 921                 INP_INFO_WUNLOCK(&V_tcbinfo);
 922         return (error);
 923 }
 924
 925 /*
 926  * Abort the TCP.  Drop the connection abruptly.
 927  */
 928 static void
 929 tcp_usr_abort(struct socket *so)
 930 {
 931         struct inpcb *inp;
 932         struct tcpcb *tp = NULL;
 933         TCPDEBUG0;
 934
 935         inp = sotoinpcb(so);
 936         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
 937
 938         INP_INFO_WLOCK(&V_tcbinfo);
 939         INP_WLOCK(inp);
 940         KASSERT(inp->inp_socket != NULL,
 941             ("tcp_usr_abort: inp_socket == NULL"));
 942
 943         /*
 944          * If we still have full TCP state, and we're not dropped, drop.
 945          */
 946         if (!(inp->inp_flags & INP_TIMEWAIT) &&
 947             !(inp->inp_flags & INP_DROPPED)) {
 948                 tp = intotcpcb(inp);
 949                 TCPDEBUG1();
 950                 tcp_drop(tp, ECONNABORTED);
 951                 TCPDEBUG2(PRU_ABORT);
 952         }
 953         if (!(inp->inp_flags & INP_DROPPED)) {
 954                 SOCK_LOCK(so);
 955                 so->so_state |= SS_PROTOREF;
 956                 SOCK_UNLOCK(so);
 957                 inp->inp_flags |= INP_SOCKREF;
 958         }
 959         INP_WUNLOCK(inp);
 960         INP_INFO_WUNLOCK(&V_tcbinfo);
 961 }
 962
 963 /*
 964  * TCP socket is closed.  Start friendly disconnect.
 965  */
 966 static void
 967 tcp_usr_close(struct socket *so)
 968 {
 969         struct inpcb *inp;
 970         struct tcpcb *tp = NULL;
 971         TCPDEBUG0;
 972
 973         inp = sotoinpcb(so);
 974         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
 975
 976         INP_INFO_WLOCK(&V_tcbinfo);
 977         INP_WLOCK(inp);
 978         KASSERT(inp->inp_socket != NULL,
 979             ("tcp_usr_close: inp_socket == NULL"));
 980
 981         /*
 982          * If we still have full TCP state, and we're not dropped, initiate
 983          * a disconnect.
 984          */
 985         if (!(inp->inp_flags & INP_TIMEWAIT) &&
 986             !(inp->inp_flags & INP_DROPPED)) {
 987                 tp = intotcpcb(inp);
 988                 TCPDEBUG1();
 989                 tcp_disconnect(tp);
 990                 TCPDEBUG2(PRU_CLOSE);
 991         }
 992         if (!(inp->inp_flags & INP_DROPPED)) {
 993                 SOCK_LOCK(so);
 994                 so->so_state |= SS_PROTOREF;
 995                 SOCK_UNLOCK(so);
 996                 inp->inp_flags |= INP_SOCKREF;
 997         }
 998         INP_WUNLOCK(inp);
 999         INP_INFO_WUNLOCK(&V_tcbinfo);
1000 }
1001
1002 /*
1003  * Receive out-of-band data.
1004  */
1005 static int
1006 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
1007 {
1008         int error = 0;
1009         struct inpcb *inp;
1010         struct tcpcb *tp = NULL;
1011
1012         TCPDEBUG0;
1013         inp = sotoinpcb(so);
1014         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
1015         INP_WLOCK(inp);
1016         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1017                 error = ECONNRESET;
1018                 goto out;
1019         }
1020         tp = intotcpcb(inp);
1021         TCPDEBUG1();
1022         if ((so->so_oobmark == 0 &&
1023              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
1024             so->so_options & SO_OOBINLINE ||
1025             tp->t_oobflags & TCPOOB_HADDATA) {
1026                 error = EINVAL;
1027                 goto out;
1028         }
1029         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
1030                 error = EWOULDBLOCK;
1031                 goto out;
1032         }
1033         m->m_len = 1;
1034         *mtod(m, caddr_t) = tp->t_iobc;
1035         if ((flags & MSG_PEEK) == 0)
1036                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
1037
1038 out:
1039         TCPDEBUG2(PRU_RCVOOB);
1040         INP_WUNLOCK(inp);
1041         return (error);
1042 }
1043
1044 #ifdef INET
1045 struct pr_usrreqs tcp_usrreqs = {
1046         .pru_abort =            tcp_usr_abort,
1047         .pru_accept =           tcp_usr_accept,
1048         .pru_attach =           tcp_usr_attach,
1049         .pru_bind =             tcp_usr_bind,
1050         .pru_connect =          tcp_usr_connect,
1051         .pru_control =          in_control,
1052         .pru_detach =           tcp_usr_detach,
1053         .pru_disconnect =       tcp_usr_disconnect,
1054         .pru_listen =           tcp_usr_listen,
1055         .pru_peeraddr =         in_getpeeraddr,
1056         .pru_rcvd =             tcp_usr_rcvd,
1057         .pru_rcvoob =           tcp_usr_rcvoob,
1058         .pru_send =             tcp_usr_send,
1059         .pru_shutdown =         tcp_usr_shutdown,
1060         .pru_sockaddr =         in_getsockaddr,
1061         .pru_sosetlabel =       in_pcbsosetlabel,
1062         .pru_close =            tcp_usr_close,
1063 };
1064 #endif /* INET */
1065
1066 #ifdef INET6
1067 struct pr_usrreqs tcp6_usrreqs = {
1068         .pru_abort =            tcp_usr_abort,
1069         .pru_accept =           tcp6_usr_accept,
1070         .pru_attach =           tcp_usr_attach,
1071         .pru_bind =             tcp6_usr_bind,
1072         .pru_connect =          tcp6_usr_connect,
1073         .pru_control =          in6_control,
1074         .pru_detach =           tcp_usr_detach,
1075         .pru_disconnect =       tcp_usr_disconnect,
1076         .pru_listen =           tcp6_usr_listen,
1077         .pru_peeraddr =         in6_mapped_peeraddr,
1078         .pru_rcvd =             tcp_usr_rcvd,
1079         .pru_rcvoob =           tcp_usr_rcvoob,
1080         .pru_send =             tcp_usr_send,
1081         .pru_shutdown =         tcp_usr_shutdown,
1082         .pru_sockaddr =         in6_mapped_sockaddr,
1083         .pru_sosetlabel =       in_pcbsosetlabel,
1084         .pru_close =            tcp_usr_close,
1085 };
1086 #endif /* INET6 */
1087
1088 #ifdef INET
1089 /*
1090  * Common subroutine to open a TCP connection to remote host specified
1091  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
1092  * port number if needed.  Call in_pcbconnect_setup to do the routing and
1093  * to choose a local host address (interface).  If there is an existing
1094  * incarnation of the same connection in TIME-WAIT state and if the remote
1095  * host was sending CC options and if the connection duration was < MSL, then
1096  * truncate the previous TIME-WAIT state and proceed.
1097  * Initialize connection parameters and enter SYN-SENT state.
1098  */
1099 static int
1100 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
1101 {
1102         struct inpcb *inp = tp->t_inpcb, *oinp;
1103         struct socket *so = inp->inp_socket;
1104         struct in_addr laddr;
1105         u_short lport;
1106         int error;
1107
1108         INP_WLOCK_ASSERT(inp);
1109         INP_HASH_WLOCK(&V_tcbinfo);
1110
1111         if (inp->inp_lport == 0) {
1112                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
1113                 if (error)
1114                         goto out;
1115         }
1116
1117         /*
1118          * Cannot simply call in_pcbconnect, because there might be an
1119          * earlier incarnation of this same connection still in
1120          * TIME_WAIT state, creating an ADDRINUSE error.
1121          */
1122         laddr = inp->inp_laddr;
1123         lport = inp->inp_lport;
1124         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
1125             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
1126         if (error && oinp == NULL)
1127                 goto out;
1128         if (oinp) {
1129                 error = EADDRINUSE;
1130                 goto out;
1131         }
1132         inp->inp_laddr = laddr;
1133         in_pcbrehash(inp);
1134         INP_HASH_WUNLOCK(&V_tcbinfo);
1135
1136         /*
1137          * Compute window scaling to request:
1138          * Scale to fit into sweet spot.  See tcp_syncache.c.
1139          * XXX: This should move to tcp_output().
1140          */
1141         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1142             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1143                 tp->request_r_scale++;
1144
1145         soisconnecting(so);
1146         TCPSTAT_INC(tcps_connattempt);
1147         tcp_state_change(tp, TCPS_SYN_SENT);
1148         tp->iss = tcp_new_isn(tp);
1149         tcp_sendseqinit(tp);
1150
1151         return 0;
1152
1153 out:
1154         INP_HASH_WUNLOCK(&V_tcbinfo);
1155         return (error);
1156 }
1157 #endif /* INET */
1158
1159 #ifdef INET6
1160 static int
1161 tcp6_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 sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
1166         struct in6_addr addr6;
1167         int error;
1168
1169         INP_WLOCK_ASSERT(inp);
1170         INP_HASH_WLOCK(&V_tcbinfo);
1171
1172         if (inp->inp_lport == 0) {
1173                 error = in6_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          * in6_pcbladdr() also handles scope zone IDs.
1183          *
1184          * XXXRW: We wouldn't need to expose in6_pcblookup_hash_locked()
1185          * outside of in6_pcb.c if there were an in6_pcbconnect_setup().
1186          */
1187         error = in6_pcbladdr(inp, nam, &addr6);
1188         if (error)
1189                 goto out;
1190         oinp = in6_pcblookup_hash_locked(inp->inp_pcbinfo,
1191                                   &sin6->sin6_addr, sin6->sin6_port,
1192                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
1193                                   ? &addr6
1194                                   : &inp->in6p_laddr,
1195                                   inp->inp_lport,  0, NULL);
1196         if (oinp) {
1197                 error = EADDRINUSE;
1198                 goto out;
1199         }
1200         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1201                 inp->in6p_laddr = addr6;
1202         inp->in6p_faddr = sin6->sin6_addr;
1203         inp->inp_fport = sin6->sin6_port;
1204         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
1205         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
1206         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
1207                 inp->inp_flow |=
1208                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
1209         in_pcbrehash(inp);
1210         INP_HASH_WUNLOCK(&V_tcbinfo);
1211
1212         /* Compute window scaling to request.  */
1213         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
1214             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
1215                 tp->request_r_scale++;
1216
1217         soisconnecting(so);
1218         TCPSTAT_INC(tcps_connattempt);
1219         tcp_state_change(tp, TCPS_SYN_SENT);
1220         tp->iss = tcp_new_isn(tp);
1221         tcp_sendseqinit(tp);
1222
1223         return 0;
1224
1225 out:
1226         INP_HASH_WUNLOCK(&V_tcbinfo);
1227         return error;
1228 }
1229 #endif /* INET6 */
1230
1231 /*
1232  * Export TCP internal state information via a struct tcp_info, based on the
1233  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
1234  * (TCP state machine, etc).  We export all information using FreeBSD-native
1235  * constants -- for example, the numeric values for tcpi_state will differ
1236  * from Linux.
1237  */
1238 static void
1239 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
1240 {
1241
1242         INP_WLOCK_ASSERT(tp->t_inpcb);
1243         bzero(ti, sizeof(*ti));
1244
1245         ti->tcpi_state = tp->t_state;
1246         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
1247                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
1248         if (tp->t_flags & TF_SACK_PERMIT)
1249                 ti->tcpi_options |= TCPI_OPT_SACK;
1250         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
1251                 ti->tcpi_options |= TCPI_OPT_WSCALE;
1252                 ti->tcpi_snd_wscale = tp->snd_scale;
1253                 ti->tcpi_rcv_wscale = tp->rcv_scale;
1254         }
1255
1256         ti->tcpi_rto = tp->t_rxtcur * tick;
1257         ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
1258         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
1259         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
1260
1261         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
1262         ti->tcpi_snd_cwnd = tp->snd_cwnd;
1263
1264         /*
1265          * FreeBSD-specific extension fields for tcp_info.
1266          */
1267         ti->tcpi_rcv_space = tp->rcv_wnd;
1268         ti->tcpi_rcv_nxt = tp->rcv_nxt;
1269         ti->tcpi_snd_wnd = tp->snd_wnd;
1270         ti->tcpi_snd_bwnd = 0;          /* Unused, kept for compat. */
1271         ti->tcpi_snd_nxt = tp->snd_nxt;
1272         ti->tcpi_snd_mss = tp->t_maxseg;
1273         ti->tcpi_rcv_mss = tp->t_maxseg;
1274         if (tp->t_flags & TF_TOE)
1275                 ti->tcpi_options |= TCPI_OPT_TOE;
1276         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
1277         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
1278         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
1279 }
1280
1281 /*
1282  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
1283  * socket option arguments.  When it re-acquires the lock after the copy, it
1284  * has to revalidate that the connection is still valid for the socket
1285  * option.
1286  */
1287 #define INP_WLOCK_RECHECK(inp) do {                                     \
1288         INP_WLOCK(inp);                                                 \
1289         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
1290                 INP_WUNLOCK(inp);                                       \
1291                 return (ECONNRESET);                                    \
1292         }                                                               \
1293         tp = intotcpcb(inp);                                            \
1294 } while(0)
1295
1296 int
1297 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
1298 {
1299         int     error, opt, optval;
1300         u_int   ui;
1301         struct  inpcb *inp;
1302         struct  tcpcb *tp;
1303         struct  tcp_info ti;
1304         char buf[TCP_CA_NAME_MAX];
1305         struct cc_algo *algo;
1306
1307         error = 0;
1308         inp = sotoinpcb(so);
1309         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
1310         INP_WLOCK(inp);
1311         if (sopt->sopt_level != IPPROTO_TCP) {
1312 #ifdef INET6
1313                 if (inp->inp_vflag & INP_IPV6PROTO) {
1314                         INP_WUNLOCK(inp);
1315                         error = ip6_ctloutput(so, sopt);
1316                 }
1317 #endif /* INET6 */
1318 #if defined(INET6) && defined(INET)
1319                 else
1320 #endif
1321 #ifdef INET
1322                 {
1323                         INP_WUNLOCK(inp);
1324                         error = ip_ctloutput(so, sopt);
1325                 }
1326 #endif
1327                 return (error);
1328         }
1329         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
1330                 INP_WUNLOCK(inp);
1331                 return (ECONNRESET);
1332         }
1333
1334         switch (sopt->sopt_dir) {
1335         case SOPT_SET:
1336                 switch (sopt->sopt_name) {
1337 #ifdef TCP_SIGNATURE
1338                 case TCP_MD5SIG:
1339                         INP_WUNLOCK(inp);
1340                         error = sooptcopyin(sopt, &optval, sizeof optval,
1341                             sizeof optval);
1342                         if (error)
1343                                 return (error);
1344
1345                         INP_WLOCK_RECHECK(inp);
1346                         if (optval > 0)
1347                                 tp->t_flags |= TF_SIGNATURE;
1348                         else
1349                                 tp->t_flags &= ~TF_SIGNATURE;
1350                         goto unlock_and_done;
1351 #endif /* TCP_SIGNATURE */
1352
1353                 case TCP_NODELAY:
1354                 case TCP_NOOPT:
1355                         INP_WUNLOCK(inp);
1356                         error = sooptcopyin(sopt, &optval, sizeof optval,
1357                             sizeof optval);
1358                         if (error)
1359                                 return (error);
1360
1361                         INP_WLOCK_RECHECK(inp);
1362                         switch (sopt->sopt_name) {
1363                         case TCP_NODELAY:
1364                                 opt = TF_NODELAY;
1365                                 break;
1366                         case TCP_NOOPT:
1367                                 opt = TF_NOOPT;
1368                                 break;
1369                         default:
1370                                 opt = 0; /* dead code to fool gcc */
1371                                 break;
1372                         }
1373
1374                         if (optval)
1375                                 tp->t_flags |= opt;
1376                         else
1377                                 tp->t_flags &= ~opt;
1378 unlock_and_done:
1379 #ifdef TCP_OFFLOAD
1380                         if (tp->t_flags & TF_TOE) {
1381                                 tcp_offload_ctloutput(tp, sopt->sopt_dir,
1382                                     sopt->sopt_name);
1383                         }
1384 #endif
1385                         INP_WUNLOCK(inp);
1386                         break;
1387
1388                 case TCP_NOPUSH:
1389                         INP_WUNLOCK(inp);
1390                         error = sooptcopyin(sopt, &optval, sizeof optval,
1391                             sizeof optval);
1392                         if (error)
1393                                 return (error);
1394
1395                         INP_WLOCK_RECHECK(inp);
1396                         if (optval)
1397                                 tp->t_flags |= TF_NOPUSH;
1398                         else if (tp->t_flags & TF_NOPUSH) {
1399                                 tp->t_flags &= ~TF_NOPUSH;
1400                                 if (TCPS_HAVEESTABLISHED(tp->t_state))
1401                                         error = tcp_output(tp);
1402                         }
1403                         goto unlock_and_done;
1404
1405                 case TCP_MAXSEG:
1406                         INP_WUNLOCK(inp);
1407                         error = sooptcopyin(sopt, &optval, sizeof optval,
1408                             sizeof optval);
1409                         if (error)
1410                                 return (error);
1411
1412                         INP_WLOCK_RECHECK(inp);
1413                         if (optval > 0 && optval <= tp->t_maxseg &&
1414                             optval + 40 >= V_tcp_minmss)
1415                                 tp->t_maxseg = optval;
1416                         else
1417                                 error = EINVAL;
1418                         goto unlock_and_done;
1419
1420                 case TCP_INFO:
1421                         INP_WUNLOCK(inp);
1422                         error = EINVAL;
1423                         break;
1424
1425                 case TCP_CONGESTION:
1426                         INP_WUNLOCK(inp);
1427                         bzero(buf, sizeof(buf));
1428                         error = sooptcopyin(sopt, &buf, sizeof(buf), 1);
1429                         if (error)
1430                                 break;
1431                         INP_WLOCK_RECHECK(inp);
1432                         /*
1433                          * Return EINVAL if we can't find the requested cc algo.
1434                          */
1435                         error = EINVAL;
1436                         CC_LIST_RLOCK();
1437                         STAILQ_FOREACH(algo, &cc_list, entries) {
1438                                 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX)
1439                                     == 0) {
1440                                         /* We've found the requested algo. */
1441                                         error = 0;
1442                                         /*
1443                                          * We hold a write lock over the tcb
1444                                          * so it's safe to do these things
1445                                          * without ordering concerns.
1446                                          */
1447                                         if (CC_ALGO(tp)->cb_destroy != NULL)
1448                                                 CC_ALGO(tp)->cb_destroy(tp->ccv);
1449                                         CC_ALGO(tp) = algo;
1450                                         /*
1451                                          * If something goes pear shaped
1452                                          * initialising the new algo,
1453                                          * fall back to newreno (which
1454                                          * does not require initialisation).
1455                                          */
1456                                         if (algo->cb_init != NULL)
1457                                                 if (algo->cb_init(tp->ccv) > 0) {
1458                                                         CC_ALGO(tp) = &newreno_cc_algo;
1459                                                         /*
1460                                                          * The only reason init
1461                                                          * should fail is
1462                                                          * because of malloc.
1463                                                          */
1464                                                         error = ENOMEM;
1465                                                 }
1466                                         break; /* Break the STAILQ_FOREACH. */
1467                                 }
1468                         }
1469                         CC_LIST_RUNLOCK();
1470                         goto unlock_and_done;
1471
1472                 case TCP_KEEPIDLE:
1473                 case TCP_KEEPINTVL:
1474                 case TCP_KEEPINIT:
1475                         INP_WUNLOCK(inp);
1476                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1477                         if (error)
1478                                 return (error);
1479
1480                         if (ui > (UINT_MAX / hz)) {
1481                                 error = EINVAL;
1482                                 break;
1483                         }
1484                         ui *= hz;
1485
1486                         INP_WLOCK_RECHECK(inp);
1487                         switch (sopt->sopt_name) {
1488                         case TCP_KEEPIDLE:
1489                                 tp->t_keepidle = ui;
1490                                 /*
1491                                  * XXX: better check current remaining
1492                                  * timeout and "merge" it with new value.
1493                                  */
1494                                 if ((tp->t_state > TCPS_LISTEN) &&
1495                                     (tp->t_state <= TCPS_CLOSING))
1496                                         tcp_timer_activate(tp, TT_KEEP,
1497                                             TP_KEEPIDLE(tp));
1498                                 break;
1499                         case TCP_KEEPINTVL:
1500                                 tp->t_keepintvl = ui;
1501                                 if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1502                                     (TP_MAXIDLE(tp) > 0))
1503                                         tcp_timer_activate(tp, TT_2MSL,
1504                                             TP_MAXIDLE(tp));
1505                                 break;
1506                         case TCP_KEEPINIT:
1507                                 tp->t_keepinit = ui;
1508                                 if (tp->t_state == TCPS_SYN_RECEIVED ||
1509                                     tp->t_state == TCPS_SYN_SENT)
1510                                         tcp_timer_activate(tp, TT_KEEP,
1511                                             TP_KEEPINIT(tp));
1512                                 break;
1513                         }
1514                         goto unlock_and_done;
1515
1516                 case TCP_KEEPCNT:
1517                         INP_WUNLOCK(inp);
1518                         error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui));
1519                         if (error)
1520                                 return (error);
1521
1522                         INP_WLOCK_RECHECK(inp);
1523                         tp->t_keepcnt = ui;
1524                         if ((tp->t_state == TCPS_FIN_WAIT_2) &&
1525                             (TP_MAXIDLE(tp) > 0))
1526                                 tcp_timer_activate(tp, TT_2MSL,
1527                                     TP_MAXIDLE(tp));
1528                         goto unlock_and_done;
1529
1530                 default:
1531                         INP_WUNLOCK(inp);
1532                         error = ENOPROTOOPT;
1533                         break;
1534                 }
1535                 break;
1536
1537         case SOPT_GET:
1538                 tp = intotcpcb(inp);
1539                 switch (sopt->sopt_name) {
1540 #ifdef TCP_SIGNATURE
1541                 case TCP_MD5SIG:
1542                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
1543                         INP_WUNLOCK(inp);
1544                         error = sooptcopyout(sopt, &optval, sizeof optval);
1545                         break;
1546 #endif
1547
1548                 case TCP_NODELAY:
1549                         optval = tp->t_flags & TF_NODELAY;
1550                         INP_WUNLOCK(inp);
1551                         error = sooptcopyout(sopt, &optval, sizeof optval);
1552                         break;
1553                 case TCP_MAXSEG:
1554                         optval = tp->t_maxseg;
1555                         INP_WUNLOCK(inp);
1556                         error = sooptcopyout(sopt, &optval, sizeof optval);
1557                         break;
1558                 case TCP_NOOPT:
1559                         optval = tp->t_flags & TF_NOOPT;
1560                         INP_WUNLOCK(inp);
1561                         error = sooptcopyout(sopt, &optval, sizeof optval);
1562                         break;
1563                 case TCP_NOPUSH:
1564                         optval = tp->t_flags & TF_NOPUSH;
1565                         INP_WUNLOCK(inp);
1566                         error = sooptcopyout(sopt, &optval, sizeof optval);
1567                         break;
1568                 case TCP_INFO:
1569                         tcp_fill_info(tp, &ti);
1570                         INP_WUNLOCK(inp);
1571                         error = sooptcopyout(sopt, &ti, sizeof ti);
1572                         break;
1573                 case TCP_CONGESTION:
1574                         bzero(buf, sizeof(buf));
1575                         strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
1576                         INP_WUNLOCK(inp);
1577                         error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX);
1578                         break;
1579                 case TCP_KEEPIDLE:
1580                 case TCP_KEEPINTVL:
1581                 case TCP_KEEPINIT:
1582                 case TCP_KEEPCNT:
1583                         switch (sopt->sopt_name) {
1584                         case TCP_KEEPIDLE:
1585                                 ui = tp->t_keepidle / hz;
1586                                 break;
1587                         case TCP_KEEPINTVL:
1588                                 ui = tp->t_keepintvl / hz;
1589                                 break;
1590                         case TCP_KEEPINIT:
1591                                 ui = tp->t_keepinit / hz;
1592                                 break;
1593                         case TCP_KEEPCNT:
1594                                 ui = tp->t_keepcnt;
1595                                 break;
1596                         }
1597                         INP_WUNLOCK(inp);
1598                         error = sooptcopyout(sopt, &ui, sizeof(ui));
1599                         break;
1600                 default:
1601                         INP_WUNLOCK(inp);
1602                         error = ENOPROTOOPT;
1603                         break;
1604                 }
1605                 break;
1606         }
1607         return (error);
1608 }
1609 #undef INP_WLOCK_RECHECK
1610
1611 /*
1612  * Attach TCP protocol to socket, allocating
1613  * internet protocol control block, tcp control block,
1614  * bufer space, and entering LISTEN state if to accept connections.
1615  */
1616 static int
1617 tcp_attach(struct socket *so)
1618 {
1619         struct tcpcb *tp;
1620         struct inpcb *inp;
1621         int error;
1622
1623         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
1624                 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace);
1625                 if (error)
1626                         return (error);
1627         }
1628         so->so_rcv.sb_flags |= SB_AUTOSIZE;
1629         so->so_snd.sb_flags |= SB_AUTOSIZE;
1630         INP_INFO_WLOCK(&V_tcbinfo);
1631         error = in_pcballoc(so, &V_tcbinfo);
1632         if (error) {
1633                 INP_INFO_WUNLOCK(&V_tcbinfo);
1634                 return (error);
1635         }
1636         inp = sotoinpcb(so);
1637 #ifdef INET6
1638         if (inp->inp_vflag & INP_IPV6PROTO) {
1639                 inp->inp_vflag |= INP_IPV6;
1640                 inp->in6p_hops = -1;    /* use kernel default */
1641         }
1642         else
1643 #endif
1644         inp->inp_vflag |= INP_IPV4;
1645         tp = tcp_newtcpcb(inp);
1646         if (tp == NULL) {
1647                 in_pcbdetach(inp);
1648                 in_pcbfree(inp);
1649                 INP_INFO_WUNLOCK(&V_tcbinfo);
1650                 return (ENOBUFS);
1651         }
1652         tp->t_state = TCPS_CLOSED;
1653         INP_WUNLOCK(inp);
1654         INP_INFO_WUNLOCK(&V_tcbinfo);
1655         return (0);
1656 }
1657
1658 /*
1659  * Initiate (or continue) disconnect.
1660  * If embryonic state, just send reset (once).
1661  * If in ``let data drain'' option and linger null, just drop.
1662  * Otherwise (hard), mark socket disconnecting and drop
1663  * current input data; switch states based on user close, and
1664  * send segment to peer (with FIN).
1665  */
1666 static void
1667 tcp_disconnect(struct tcpcb *tp)
1668 {
1669         struct inpcb *inp = tp->t_inpcb;
1670         struct socket *so = inp->inp_socket;
1671
1672         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1673         INP_WLOCK_ASSERT(inp);
1674
1675         /*
1676          * Neither tcp_close() nor tcp_drop() should return NULL, as the
1677          * socket is still open.
1678          */
1679         if (tp->t_state < TCPS_ESTABLISHED) {
1680                 tp = tcp_close(tp);
1681                 KASSERT(tp != NULL,
1682                     ("tcp_disconnect: tcp_close() returned NULL"));
1683         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
1684                 tp = tcp_drop(tp, 0);
1685                 KASSERT(tp != NULL,
1686                     ("tcp_disconnect: tcp_drop() returned NULL"));
1687         } else {
1688                 soisdisconnecting(so);
1689                 sbflush(&so->so_rcv);
1690                 tcp_usrclosed(tp);
1691                 if (!(inp->inp_flags & INP_DROPPED))
1692                         tcp_output(tp);
1693         }
1694 }
1695
1696 /*
1697  * User issued close, and wish to trail through shutdown states:
1698  * if never received SYN, just forget it.  If got a SYN from peer,
1699  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
1700  * If already got a FIN from peer, then almost done; go to LAST_ACK
1701  * state.  In all other cases, have already sent FIN to peer (e.g.
1702  * after PRU_SHUTDOWN), and just have to play tedious game waiting
1703  * for peer to send FIN or not respond to keep-alives, etc.
1704  * We can let the user exit from the close as soon as the FIN is acked.
1705  */
1706 static void
1707 tcp_usrclosed(struct tcpcb *tp)
1708 {
1709
1710         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
1711         INP_WLOCK_ASSERT(tp->t_inpcb);
1712
1713         switch (tp->t_state) {
1714         case TCPS_LISTEN:
1715 #ifdef TCP_OFFLOAD
1716                 tcp_offload_listen_stop(tp);
1717 #endif
1718                 /* FALLTHROUGH */
1719         case TCPS_CLOSED:
1720                 tcp_state_change(tp, TCPS_CLOSED);
1721                 tp = tcp_close(tp);
1722                 /*
1723                  * tcp_close() should never return NULL here as the socket is
1724                  * still open.
1725                  */
1726                 KASSERT(tp != NULL,
1727                     ("tcp_usrclosed: tcp_close() returned NULL"));
1728                 break;
1729
1730         case TCPS_SYN_SENT:
1731         case TCPS_SYN_RECEIVED:
1732                 tp->t_flags |= TF_NEEDFIN;
1733                 break;
1734
1735         case TCPS_ESTABLISHED:
1736                 tcp_state_change(tp, TCPS_FIN_WAIT_1);
1737                 break;
1738
1739         case TCPS_CLOSE_WAIT:
1740                 tcp_state_change(tp, TCPS_LAST_ACK);
1741                 break;
1742         }
1743         if (tp->t_state >= TCPS_FIN_WAIT_2) {
1744                 soisdisconnected(tp->t_inpcb->inp_socket);
1745                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
1746                 if (tp->t_state == TCPS_FIN_WAIT_2) {
1747                         int timeout;
1748
1749                         timeout = (tcp_fast_finwait2_recycle) ?
1750                             tcp_finwait2_timeout : TP_MAXIDLE(tp);
1751                         tcp_timer_activate(tp, TT_2MSL, timeout);
1752                 }
1753         }
1754 }
1755
1756 #ifdef DDB
1757 static void
1758 db_print_indent(int indent)
1759 {
1760         int i;
1761
1762         for (i = 0; i < indent; i++)
1763                 db_printf(" ");
1764 }
1765
1766 static void
1767 db_print_tstate(int t_state)
1768 {
1769
1770         switch (t_state) {
1771         case TCPS_CLOSED:
1772                 db_printf("TCPS_CLOSED");
1773                 return;
1774
1775         case TCPS_LISTEN:
1776                 db_printf("TCPS_LISTEN");
1777                 return;
1778
1779         case TCPS_SYN_SENT:
1780                 db_printf("TCPS_SYN_SENT");
1781                 return;
1782
1783         case TCPS_SYN_RECEIVED:
1784                 db_printf("TCPS_SYN_RECEIVED");
1785                 return;
1786
1787         case TCPS_ESTABLISHED:
1788                 db_printf("TCPS_ESTABLISHED");
1789                 return;
1790
1791         case TCPS_CLOSE_WAIT:
1792                 db_printf("TCPS_CLOSE_WAIT");
1793                 return;
1794
1795         case TCPS_FIN_WAIT_1:
1796                 db_printf("TCPS_FIN_WAIT_1");
1797                 return;
1798
1799         case TCPS_CLOSING:
1800                 db_printf("TCPS_CLOSING");
1801                 return;
1802
1803         case TCPS_LAST_ACK:
1804                 db_printf("TCPS_LAST_ACK");
1805                 return;
1806
1807         case TCPS_FIN_WAIT_2:
1808                 db_printf("TCPS_FIN_WAIT_2");
1809                 return;
1810
1811         case TCPS_TIME_WAIT:
1812                 db_printf("TCPS_TIME_WAIT");
1813                 return;
1814
1815         default:
1816                 db_printf("unknown");
1817                 return;
1818         }
1819 }
1820
1821 static void
1822 db_print_tflags(u_int t_flags)
1823 {
1824         int comma;
1825
1826         comma = 0;
1827         if (t_flags & TF_ACKNOW) {
1828                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
1829                 comma = 1;
1830         }
1831         if (t_flags & TF_DELACK) {
1832                 db_printf("%sTF_DELACK", comma ? ", " : "");
1833                 comma = 1;
1834         }
1835         if (t_flags & TF_NODELAY) {
1836                 db_printf("%sTF_NODELAY", comma ? ", " : "");
1837                 comma = 1;
1838         }
1839         if (t_flags & TF_NOOPT) {
1840                 db_printf("%sTF_NOOPT", comma ? ", " : "");
1841                 comma = 1;
1842         }
1843         if (t_flags & TF_SENTFIN) {
1844                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
1845                 comma = 1;
1846         }
1847         if (t_flags & TF_REQ_SCALE) {
1848                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
1849                 comma = 1;
1850         }
1851         if (t_flags & TF_RCVD_SCALE) {
1852                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
1853                 comma = 1;
1854         }
1855         if (t_flags & TF_REQ_TSTMP) {
1856                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
1857                 comma = 1;
1858         }
1859         if (t_flags & TF_RCVD_TSTMP) {
1860                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
1861                 comma = 1;
1862         }
1863         if (t_flags & TF_SACK_PERMIT) {
1864                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
1865                 comma = 1;
1866         }
1867         if (t_flags & TF_NEEDSYN) {
1868                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
1869                 comma = 1;
1870         }
1871         if (t_flags & TF_NEEDFIN) {
1872                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
1873                 comma = 1;
1874         }
1875         if (t_flags & TF_NOPUSH) {
1876                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
1877                 comma = 1;
1878         }
1879         if (t_flags & TF_MORETOCOME) {
1880                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
1881                 comma = 1;
1882         }
1883         if (t_flags & TF_LQ_OVERFLOW) {
1884                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
1885                 comma = 1;
1886         }
1887         if (t_flags & TF_LASTIDLE) {
1888                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
1889                 comma = 1;
1890         }
1891         if (t_flags & TF_RXWIN0SENT) {
1892                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
1893                 comma = 1;
1894         }
1895         if (t_flags & TF_FASTRECOVERY) {
1896                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
1897                 comma = 1;
1898         }
1899         if (t_flags & TF_CONGRECOVERY) {
1900                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
1901                 comma = 1;
1902         }
1903         if (t_flags & TF_WASFRECOVERY) {
1904                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
1905                 comma = 1;
1906         }
1907         if (t_flags & TF_SIGNATURE) {
1908                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
1909                 comma = 1;
1910         }
1911         if (t_flags & TF_FORCEDATA) {
1912                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
1913                 comma = 1;
1914         }
1915         if (t_flags & TF_TSO) {
1916                 db_printf("%sTF_TSO", comma ? ", " : "");
1917                 comma = 1;
1918         }
1919         if (t_flags & TF_ECN_PERMIT) {
1920                 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
1921                 comma = 1;
1922         }
1923 }
1924
1925 static void
1926 db_print_toobflags(char t_oobflags)
1927 {
1928         int comma;
1929
1930         comma = 0;
1931         if (t_oobflags & TCPOOB_HAVEDATA) {
1932                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
1933                 comma = 1;
1934         }
1935         if (t_oobflags & TCPOOB_HADDATA) {
1936                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
1937                 comma = 1;
1938         }
1939 }
1940
1941 static void
1942 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
1943 {
1944
1945         db_print_indent(indent);
1946         db_printf("%s at %p\n", name, tp);
1947
1948         indent += 2;
1949
1950         db_print_indent(indent);
1951         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
1952            tp->t_segq, tp->t_segqlen, tp->t_dupacks);
1953
1954         db_print_indent(indent);
1955         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
1956             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
1957
1958         db_print_indent(indent);
1959         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
1960             &tp->t_timers->tt_delack, tp->t_inpcb);
1961
1962         db_print_indent(indent);
1963         db_printf("t_state: %d (", tp->t_state);
1964         db_print_tstate(tp->t_state);
1965         db_printf(")\n");
1966
1967         db_print_indent(indent);
1968         db_printf("t_flags: 0x%x (", tp->t_flags);
1969         db_print_tflags(tp->t_flags);
1970         db_printf(")\n");
1971
1972         db_print_indent(indent);
1973         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
1974             tp->snd_una, tp->snd_max, tp->snd_nxt);
1975
1976         db_print_indent(indent);
1977         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
1978            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
1979
1980         db_print_indent(indent);
1981         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
1982             tp->iss, tp->irs, tp->rcv_nxt);
1983
1984         db_print_indent(indent);
1985         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
1986             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
1987
1988         db_print_indent(indent);
1989         db_printf("snd_wnd: %lu   snd_cwnd: %lu\n",
1990            tp->snd_wnd, tp->snd_cwnd);
1991
1992         db_print_indent(indent);
1993         db_printf("snd_ssthresh: %lu   snd_recover: "
1994             "0x%08x\n", tp->snd_ssthresh, tp->snd_recover);
1995
1996         db_print_indent(indent);
1997         db_printf("t_maxopd: %u   t_rcvtime: %u   t_startime: %u\n",
1998             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
1999
2000         db_print_indent(indent);
2001         db_printf("t_rttime: %u   t_rtsq: 0x%08x\n",
2002             tp->t_rtttime, tp->t_rtseq);
2003
2004         db_print_indent(indent);
2005         db_printf("t_rxtcur: %d   t_maxseg: %u   t_srtt: %d\n",
2006             tp->t_rxtcur, tp->t_maxseg, tp->t_srtt);
2007
2008         db_print_indent(indent);
2009         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
2010             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
2011             tp->t_rttbest);
2012
2013         db_print_indent(indent);
2014         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
2015             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
2016
2017         db_print_indent(indent);
2018         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
2019         db_print_toobflags(tp->t_oobflags);
2020         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
2021
2022         db_print_indent(indent);
2023         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
2024             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
2025
2026         db_print_indent(indent);
2027         db_printf("ts_recent: %u   ts_recent_age: %u\n",
2028             tp->ts_recent, tp->ts_recent_age);
2029
2030         db_print_indent(indent);
2031         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
2032             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
2033
2034         db_print_indent(indent);
2035         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
2036             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
2037             tp->snd_recover_prev, tp->t_badrxtwin);
2038
2039         db_print_indent(indent);
2040         db_printf("snd_numholes: %d  snd_holes first: %p\n",
2041             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
2042
2043         db_print_indent(indent);
2044         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
2045             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
2046
2047         /* Skip sackblks, sackhint. */
2048
2049         db_print_indent(indent);
2050         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
2051             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
2052 }
2053
2054 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
2055 {
2056         struct tcpcb *tp;
2057
2058         if (!have_addr) {
2059                 db_printf("usage: show tcpcb <addr>\n");
2060                 return;
2061         }
2062         tp = (struct tcpcb *)addr;
2063
2064         db_print_tcpcb(tp, "tcpcb", 0);
2065 }
2066 #endif