The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_usrreq.c

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    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  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 4. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      From: @(#)tcp_usrreq.c  8.2 (Berkeley) 1/3/94
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/7.4/sys/netinet/tcp_usrreq.c 218576 2011-02-11 15:15:08Z jhb $");
   36 
   37 #include "opt_ddb.h"
   38 #include "opt_inet.h"
   39 #include "opt_inet6.h"
   40 #include "opt_tcpdebug.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/malloc.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/mbuf.h>
   48 #ifdef INET6
   49 #include <sys/domain.h>
   50 #endif /* INET6 */
   51 #include <sys/socket.h>
   52 #include <sys/socketvar.h>
   53 #include <sys/protosw.h>
   54 #include <sys/proc.h>
   55 #include <sys/jail.h>
   56 
   57 #ifdef DDB
   58 #include <ddb/ddb.h>
   59 #endif
   60 
   61 #include <net/if.h>
   62 #include <net/route.h>
   63 
   64 #include <netinet/in.h>
   65 #include <netinet/in_systm.h>
   66 #ifdef INET6
   67 #include <netinet/ip6.h>
   68 #endif
   69 #include <netinet/in_pcb.h>
   70 #ifdef INET6
   71 #include <netinet6/in6_pcb.h>
   72 #endif
   73 #include <netinet/in_var.h>
   74 #include <netinet/ip_var.h>
   75 #ifdef INET6
   76 #include <netinet6/ip6_var.h>
   77 #include <netinet6/scope6_var.h>
   78 #endif
   79 #include <netinet/tcp.h>
   80 #include <netinet/tcp_fsm.h>
   81 #include <netinet/tcp_seq.h>
   82 #include <netinet/tcp_timer.h>
   83 #include <netinet/tcp_var.h>
   84 #include <netinet/tcpip.h>
   85 #ifdef TCPDEBUG
   86 #include <netinet/tcp_debug.h>
   87 #endif
   88 #include <netinet/tcp_offload.h>
   89 
   90 /*
   91  * TCP protocol interface to socket abstraction.
   92  */
   93 static int      tcp_attach(struct socket *);
   94 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
   95                     struct thread *td);
   96 #ifdef INET6
   97 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
   98                     struct thread *td);
   99 #endif /* INET6 */
  100 static void     tcp_disconnect(struct tcpcb *);
  101 static void     tcp_usrclosed(struct tcpcb *);
  102 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
  103 
  104 #ifdef TCPDEBUG
  105 #define TCPDEBUG0       int ostate = 0
  106 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
  107 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
  108                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
  109 #else
  110 #define TCPDEBUG0
  111 #define TCPDEBUG1()
  112 #define TCPDEBUG2(req)
  113 #endif
  114 
  115 /*
  116  * TCP attaches to socket via pru_attach(), reserving space,
  117  * and an internet control block.
  118  */
  119 static int
  120 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
  121 {
  122         struct inpcb *inp;
  123         struct tcpcb *tp = NULL;
  124         int error;
  125         TCPDEBUG0;
  126 
  127         inp = sotoinpcb(so);
  128         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
  129         TCPDEBUG1();
  130 
  131         error = tcp_attach(so);
  132         if (error)
  133                 goto out;
  134 
  135         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
  136                 so->so_linger = TCP_LINGERTIME;
  137 
  138         inp = sotoinpcb(so);
  139         tp = intotcpcb(inp);
  140 out:
  141         TCPDEBUG2(PRU_ATTACH);
  142         return error;
  143 }
  144 
  145 /*
  146  * tcp_detach is called when the socket layer loses its final reference
  147  * to the socket, be it a file descriptor reference, a reference from TCP,
  148  * etc.  At this point, there is only one case in which we will keep around
  149  * inpcb state: time wait.
  150  *
  151  * This function can probably be re-absorbed back into tcp_usr_detach() now
  152  * that there is a single detach path.
  153  */
  154 static void
  155 tcp_detach(struct socket *so, struct inpcb *inp)
  156 {
  157         struct tcpcb *tp;
  158 
  159         INP_INFO_WLOCK_ASSERT(&tcbinfo);
  160         INP_WLOCK_ASSERT(inp);
  161 
  162         KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
  163         KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
  164 
  165         tp = intotcpcb(inp);
  166 
  167         if (inp->inp_flags & INP_TIMEWAIT) {
  168                 /*
  169                  * There are two cases to handle: one in which the time wait
  170                  * state is being discarded (INP_DROPPED), and one in which
  171                  * this connection will remain in timewait.  In the former,
  172                  * it is time to discard all state (except tcptw, which has
  173                  * already been discarded by the timewait close code, which
  174                  * should be further up the call stack somewhere).  In the
  175                  * latter case, we detach from the socket, but leave the pcb
  176                  * present until timewait ends.
  177                  *
  178                  * XXXRW: Would it be cleaner to free the tcptw here?
  179                  */
  180                 if (inp->inp_flags & INP_DROPPED) {
  181                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
  182                             "INP_DROPPED && tp != NULL"));
  183                         in_pcbdetach(inp);
  184                         in_pcbfree(inp);
  185                 } else {
  186                         in_pcbdetach(inp);
  187                         INP_WUNLOCK(inp);
  188                 }
  189         } else {
  190                 /*
  191                  * If the connection is not in timewait, we consider two
  192                  * two conditions: one in which no further processing is
  193                  * necessary (dropped || embryonic), and one in which TCP is
  194                  * not yet done, but no longer requires the socket, so the
  195                  * pcb will persist for the time being.
  196                  *
  197                  * XXXRW: Does the second case still occur?
  198                  */
  199                 if (inp->inp_flags & INP_DROPPED ||
  200                     tp->t_state < TCPS_SYN_SENT) {
  201                         tcp_discardcb(tp);
  202                         in_pcbdetach(inp);
  203                         in_pcbfree(inp);
  204                 } else
  205                         in_pcbdetach(inp);
  206         }
  207 }
  208 
  209 /*
  210  * pru_detach() detaches the TCP protocol from the socket.
  211  * If the protocol state is non-embryonic, then can't
  212  * do this directly: have to initiate a pru_disconnect(),
  213  * which may finish later; embryonic TCB's can just
  214  * be discarded here.
  215  */
  216 static void
  217 tcp_usr_detach(struct socket *so)
  218 {
  219         struct inpcb *inp;
  220 
  221         inp = sotoinpcb(so);
  222         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
  223         INP_INFO_WLOCK(&tcbinfo);
  224         INP_WLOCK(inp);
  225         KASSERT(inp->inp_socket != NULL,
  226             ("tcp_usr_detach: inp_socket == NULL"));
  227         tcp_detach(so, inp);
  228         INP_INFO_WUNLOCK(&tcbinfo);
  229 }
  230 
  231 /*
  232  * Give the socket an address.
  233  */
  234 static int
  235 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  236 {
  237         int error = 0;
  238         struct inpcb *inp;
  239         struct tcpcb *tp = NULL;
  240         struct sockaddr_in *sinp;
  241 
  242         sinp = (struct sockaddr_in *)nam;
  243         if (nam->sa_len != sizeof (*sinp))
  244                 return (EINVAL);
  245         /*
  246          * Must check for multicast addresses and disallow binding
  247          * to them.
  248          */
  249         if (sinp->sin_family == AF_INET &&
  250             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
  251                 return (EAFNOSUPPORT);
  252 
  253         TCPDEBUG0;
  254         INP_INFO_WLOCK(&tcbinfo);
  255         inp = sotoinpcb(so);
  256         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
  257         INP_WLOCK(inp);
  258         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  259                 error = EINVAL;
  260                 goto out;
  261         }
  262         tp = intotcpcb(inp);
  263         TCPDEBUG1();
  264         error = in_pcbbind(inp, nam, td->td_ucred);
  265 out:
  266         TCPDEBUG2(PRU_BIND);
  267         INP_WUNLOCK(inp);
  268         INP_INFO_WUNLOCK(&tcbinfo);
  269 
  270         return (error);
  271 }
  272 
  273 #ifdef INET6
  274 static int
  275 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  276 {
  277         int error = 0;
  278         struct inpcb *inp;
  279         struct tcpcb *tp = NULL;
  280         struct sockaddr_in6 *sin6p;
  281 
  282         sin6p = (struct sockaddr_in6 *)nam;
  283         if (nam->sa_len != sizeof (*sin6p))
  284                 return (EINVAL);
  285         /*
  286          * Must check for multicast addresses and disallow binding
  287          * to them.
  288          */
  289         if (sin6p->sin6_family == AF_INET6 &&
  290             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
  291                 return (EAFNOSUPPORT);
  292 
  293         TCPDEBUG0;
  294         INP_INFO_WLOCK(&tcbinfo);
  295         inp = sotoinpcb(so);
  296         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
  297         INP_WLOCK(inp);
  298         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  299                 error = EINVAL;
  300                 goto out;
  301         }
  302         tp = intotcpcb(inp);
  303         TCPDEBUG1();
  304         inp->inp_vflag &= ~INP_IPV4;
  305         inp->inp_vflag |= INP_IPV6;
  306         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  307                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
  308                         inp->inp_vflag |= INP_IPV4;
  309                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
  310                         struct sockaddr_in sin;
  311 
  312                         in6_sin6_2_sin(&sin, sin6p);
  313                         inp->inp_vflag |= INP_IPV4;
  314                         inp->inp_vflag &= ~INP_IPV6;
  315                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
  316                             td->td_ucred);
  317                         goto out;
  318                 }
  319         }
  320         error = in6_pcbbind(inp, nam, td->td_ucred);
  321 out:
  322         TCPDEBUG2(PRU_BIND);
  323         INP_WUNLOCK(inp);
  324         INP_INFO_WUNLOCK(&tcbinfo);
  325         return (error);
  326 }
  327 #endif /* INET6 */
  328 
  329 /*
  330  * Prepare to accept connections.
  331  */
  332 static int
  333 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
  334 {
  335         int error = 0;
  336         struct inpcb *inp;
  337         struct tcpcb *tp = NULL;
  338 
  339         TCPDEBUG0;
  340         INP_INFO_WLOCK(&tcbinfo);
  341         inp = sotoinpcb(so);
  342         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
  343         INP_WLOCK(inp);
  344         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  345                 error = EINVAL;
  346                 goto out;
  347         }
  348         tp = intotcpcb(inp);
  349         TCPDEBUG1();
  350         SOCK_LOCK(so);
  351         error = solisten_proto_check(so);
  352         if (error == 0 && inp->inp_lport == 0)
  353                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
  354         if (error == 0) {
  355                 tp->t_state = TCPS_LISTEN;
  356                 solisten_proto(so, backlog);
  357                 tcp_offload_listen_open(tp);
  358         }
  359         SOCK_UNLOCK(so);
  360 
  361 out:
  362         TCPDEBUG2(PRU_LISTEN);
  363         INP_WUNLOCK(inp);
  364         INP_INFO_WUNLOCK(&tcbinfo);
  365         return (error);
  366 }
  367 
  368 #ifdef INET6
  369 static int
  370 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
  371 {
  372         int error = 0;
  373         struct inpcb *inp;
  374         struct tcpcb *tp = NULL;
  375 
  376         TCPDEBUG0;
  377         INP_INFO_WLOCK(&tcbinfo);
  378         inp = sotoinpcb(so);
  379         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
  380         INP_WLOCK(inp);
  381         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  382                 error = EINVAL;
  383                 goto out;
  384         }
  385         tp = intotcpcb(inp);
  386         TCPDEBUG1();
  387         SOCK_LOCK(so);
  388         error = solisten_proto_check(so);
  389         if (error == 0 && inp->inp_lport == 0) {
  390                 inp->inp_vflag &= ~INP_IPV4;
  391                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  392                         inp->inp_vflag |= INP_IPV4;
  393                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
  394         }
  395         if (error == 0) {
  396                 tp->t_state = TCPS_LISTEN;
  397                 solisten_proto(so, backlog);
  398         }
  399         SOCK_UNLOCK(so);
  400 
  401 out:
  402         TCPDEBUG2(PRU_LISTEN);
  403         INP_WUNLOCK(inp);
  404         INP_INFO_WUNLOCK(&tcbinfo);
  405         return (error);
  406 }
  407 #endif /* INET6 */
  408 
  409 /*
  410  * Initiate connection to peer.
  411  * Create a template for use in transmissions on this connection.
  412  * Enter SYN_SENT state, and mark socket as connecting.
  413  * Start keep-alive timer, and seed output sequence space.
  414  * Send initial segment on connection.
  415  */
  416 static int
  417 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  418 {
  419         int error = 0;
  420         struct inpcb *inp;
  421         struct tcpcb *tp = NULL;
  422         struct sockaddr_in *sinp;
  423 
  424         sinp = (struct sockaddr_in *)nam;
  425         if (nam->sa_len != sizeof (*sinp))
  426                 return (EINVAL);
  427         /*
  428          * Must disallow TCP ``connections'' to multicast addresses.
  429          */
  430         if (sinp->sin_family == AF_INET
  431             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
  432                 return (EAFNOSUPPORT);
  433         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
  434                 return (error);
  435 
  436         TCPDEBUG0;
  437         INP_INFO_WLOCK(&tcbinfo);
  438         inp = sotoinpcb(so);
  439         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
  440         INP_WLOCK(inp);
  441         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  442                 error = EINVAL;
  443                 goto out;
  444         }
  445         tp = intotcpcb(inp);
  446         TCPDEBUG1();
  447         if ((error = tcp_connect(tp, nam, td)) != 0)
  448                 goto out;
  449         error = tcp_output_connect(so, nam);
  450 out:
  451         TCPDEBUG2(PRU_CONNECT);
  452         INP_WUNLOCK(inp);
  453         INP_INFO_WUNLOCK(&tcbinfo);
  454         return (error);
  455 }
  456 
  457 #ifdef INET6
  458 static int
  459 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  460 {
  461         int error = 0;
  462         struct inpcb *inp;
  463         struct tcpcb *tp = NULL;
  464         struct sockaddr_in6 *sin6p;
  465 
  466         TCPDEBUG0;
  467 
  468         sin6p = (struct sockaddr_in6 *)nam;
  469         if (nam->sa_len != sizeof (*sin6p))
  470                 return (EINVAL);
  471         /*
  472          * Must disallow TCP ``connections'' to multicast addresses.
  473          */
  474         if (sin6p->sin6_family == AF_INET6
  475             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
  476                 return (EAFNOSUPPORT);
  477 
  478         INP_INFO_WLOCK(&tcbinfo);
  479         inp = sotoinpcb(so);
  480         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
  481         INP_WLOCK(inp);
  482         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  483                 error = EINVAL;
  484                 goto out;
  485         }
  486         tp = intotcpcb(inp);
  487         TCPDEBUG1();
  488         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
  489                 struct sockaddr_in sin;
  490 
  491                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
  492                         error = EINVAL;
  493                         goto out;
  494                 }
  495 
  496                 in6_sin6_2_sin(&sin, sin6p);
  497                 inp->inp_vflag |= INP_IPV4;
  498                 inp->inp_vflag &= ~INP_IPV6;
  499                 if ((error = prison_remote_ip4(td->td_ucred,
  500                     &sin.sin_addr)) != 0)
  501                         goto out;
  502                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
  503                         goto out;
  504                 error = tcp_output_connect(so, nam);
  505                 goto out;
  506         }
  507         inp->inp_vflag &= ~INP_IPV4;
  508         inp->inp_vflag |= INP_IPV6;
  509         inp->inp_inc.inc_flags |= INC_ISIPV6;
  510         if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
  511                 goto out;
  512         if ((error = tcp6_connect(tp, nam, td)) != 0)
  513                 goto out;
  514         error = tcp_output_connect(so, nam);
  515 
  516 out:
  517         TCPDEBUG2(PRU_CONNECT);
  518         INP_WUNLOCK(inp);
  519         INP_INFO_WUNLOCK(&tcbinfo);
  520         return (error);
  521 }
  522 #endif /* INET6 */
  523 
  524 /*
  525  * Initiate disconnect from peer.
  526  * If connection never passed embryonic stage, just drop;
  527  * else if don't need to let data drain, then can just drop anyways,
  528  * else have to begin TCP shutdown process: mark socket disconnecting,
  529  * drain unread data, state switch to reflect user close, and
  530  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
  531  * when peer sends FIN and acks ours.
  532  *
  533  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
  534  */
  535 static int
  536 tcp_usr_disconnect(struct socket *so)
  537 {
  538         struct inpcb *inp;
  539         struct tcpcb *tp = NULL;
  540         int error = 0;
  541 
  542         TCPDEBUG0;
  543         INP_INFO_WLOCK(&tcbinfo);
  544         inp = sotoinpcb(so);
  545         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
  546         INP_WLOCK(inp);
  547         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  548                 error = ECONNRESET;
  549                 goto out;
  550         }
  551         tp = intotcpcb(inp);
  552         TCPDEBUG1();
  553         tcp_disconnect(tp);
  554 out:
  555         TCPDEBUG2(PRU_DISCONNECT);
  556         INP_WUNLOCK(inp);
  557         INP_INFO_WUNLOCK(&tcbinfo);
  558         return (error);
  559 }
  560 
  561 /*
  562  * Accept a connection.  Essentially all the work is
  563  * done at higher levels; just return the address
  564  * of the peer, storing through addr.
  565  */
  566 static int
  567 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
  568 {
  569         int error = 0;
  570         struct inpcb *inp = NULL;
  571         struct tcpcb *tp = NULL;
  572         struct in_addr addr;
  573         in_port_t port = 0;
  574         TCPDEBUG0;
  575 
  576         if (so->so_state & SS_ISDISCONNECTED)
  577                 return (ECONNABORTED);
  578 
  579         inp = sotoinpcb(so);
  580         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
  581         INP_INFO_RLOCK(&tcbinfo);
  582         INP_WLOCK(inp);
  583         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  584                 error = ECONNABORTED;
  585                 goto out;
  586         }
  587         tp = intotcpcb(inp);
  588         TCPDEBUG1();
  589 
  590         /*
  591          * We inline in_getpeeraddr and COMMON_END here, so that we can
  592          * copy the data of interest and defer the malloc until after we
  593          * release the lock.
  594          */
  595         port = inp->inp_fport;
  596         addr = inp->inp_faddr;
  597 
  598 out:
  599         TCPDEBUG2(PRU_ACCEPT);
  600         INP_WUNLOCK(inp);
  601         INP_INFO_RUNLOCK(&tcbinfo);
  602         if (error == 0)
  603                 *nam = in_sockaddr(port, &addr);
  604         return error;
  605 }
  606 
  607 #ifdef INET6
  608 static int
  609 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
  610 {
  611         struct inpcb *inp = NULL;
  612         int error = 0;
  613         struct tcpcb *tp = NULL;
  614         struct in_addr addr;
  615         struct in6_addr addr6;
  616         in_port_t port = 0;
  617         int v4 = 0;
  618         TCPDEBUG0;
  619 
  620         if (so->so_state & SS_ISDISCONNECTED)
  621                 return (ECONNABORTED);
  622 
  623         inp = sotoinpcb(so);
  624         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
  625         INP_WLOCK(inp);
  626         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  627                 error = ECONNABORTED;
  628                 goto out;
  629         }
  630         tp = intotcpcb(inp);
  631         TCPDEBUG1();
  632 
  633         /*
  634          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
  635          * copy the data of interest and defer the malloc until after we
  636          * release the lock.
  637          */
  638         if (inp->inp_vflag & INP_IPV4) {
  639                 v4 = 1;
  640                 port = inp->inp_fport;
  641                 addr = inp->inp_faddr;
  642         } else {
  643                 port = inp->inp_fport;
  644                 addr6 = inp->in6p_faddr;
  645         }
  646 
  647 out:
  648         TCPDEBUG2(PRU_ACCEPT);
  649         INP_WUNLOCK(inp);
  650         if (error == 0) {
  651                 if (v4)
  652                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
  653                 else
  654                         *nam = in6_sockaddr(port, &addr6);
  655         }
  656         return error;
  657 }
  658 #endif /* INET6 */
  659 
  660 /*
  661  * Mark the connection as being incapable of further output.
  662  */
  663 static int
  664 tcp_usr_shutdown(struct socket *so)
  665 {
  666         int error = 0;
  667         struct inpcb *inp;
  668         struct tcpcb *tp = NULL;
  669 
  670         TCPDEBUG0;
  671         INP_INFO_WLOCK(&tcbinfo);
  672         inp = sotoinpcb(so);
  673         KASSERT(inp != NULL, ("inp == NULL"));
  674         INP_WLOCK(inp);
  675         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  676                 error = ECONNRESET;
  677                 goto out;
  678         }
  679         tp = intotcpcb(inp);
  680         TCPDEBUG1();
  681         socantsendmore(so);
  682         tcp_usrclosed(tp);
  683         if (!(inp->inp_flags & INP_DROPPED))
  684                 error = tcp_output_disconnect(tp);
  685 
  686 out:
  687         TCPDEBUG2(PRU_SHUTDOWN);
  688         INP_WUNLOCK(inp);
  689         INP_INFO_WUNLOCK(&tcbinfo);
  690 
  691         return (error);
  692 }
  693 
  694 /*
  695  * After a receive, possibly send window update to peer.
  696  */
  697 static int
  698 tcp_usr_rcvd(struct socket *so, int flags)
  699 {
  700         struct inpcb *inp;
  701         struct tcpcb *tp = NULL;
  702         int error = 0;
  703 
  704         TCPDEBUG0;
  705         inp = sotoinpcb(so);
  706         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
  707         INP_WLOCK(inp);
  708         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  709                 error = ECONNRESET;
  710                 goto out;
  711         }
  712         tp = intotcpcb(inp);
  713         TCPDEBUG1();
  714         tcp_output_rcvd(tp);
  715 
  716 out:
  717         TCPDEBUG2(PRU_RCVD);
  718         INP_WUNLOCK(inp);
  719         return (error);
  720 }
  721 
  722 /*
  723  * Do a send by putting data in output queue and updating urgent
  724  * marker if URG set.  Possibly send more data.  Unlike the other
  725  * pru_*() routines, the mbuf chains are our responsibility.  We
  726  * must either enqueue them or free them.  The other pru_* routines
  727  * generally are caller-frees.
  728  */
  729 static int
  730 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
  731     struct sockaddr *nam, struct mbuf *control, struct thread *td)
  732 {
  733         int error = 0;
  734         struct inpcb *inp;
  735         struct tcpcb *tp = NULL;
  736         int headlocked = 0;
  737 #ifdef INET6
  738         int isipv6;
  739 #endif
  740         TCPDEBUG0;
  741 
  742         /*
  743          * We require the pcbinfo lock in two cases:
  744          *
  745          * (1) An implied connect is taking place, which can result in
  746          *     binding IPs and ports and hence modification of the pcb hash
  747          *     chains.
  748          *
  749          * (2) PRUS_EOF is set, resulting in explicit close on the send.
  750          */
  751         if ((nam != NULL) || (flags & PRUS_EOF)) {
  752                 INP_INFO_WLOCK(&tcbinfo);
  753                 headlocked = 1;
  754         }
  755         inp = sotoinpcb(so);
  756         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
  757         INP_WLOCK(inp);
  758         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  759                 if (control)
  760                         m_freem(control);
  761                 if (m)
  762                         m_freem(m);
  763                 error = ECONNRESET;
  764                 goto out;
  765         }
  766 #ifdef INET6
  767         isipv6 = nam && nam->sa_family == AF_INET6;
  768 #endif /* INET6 */
  769         tp = intotcpcb(inp);
  770         TCPDEBUG1();
  771         if (control) {
  772                 /* TCP doesn't do control messages (rights, creds, etc) */
  773                 if (control->m_len) {
  774                         m_freem(control);
  775                         if (m)
  776                                 m_freem(m);
  777                         error = EINVAL;
  778                         goto out;
  779                 }
  780                 m_freem(control);       /* empty control, just free it */
  781         }
  782         if (!(flags & PRUS_OOB)) {
  783                 sbappendstream(&so->so_snd, m);
  784                 if (nam && tp->t_state < TCPS_SYN_SENT) {
  785                         /*
  786                          * Do implied connect if not yet connected,
  787                          * initialize window to default value, and
  788                          * initialize maxseg/maxopd using peer's cached
  789                          * MSS.
  790                          */
  791                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
  792 #ifdef INET6
  793                         if (isipv6)
  794                                 error = tcp6_connect(tp, nam, td);
  795                         else
  796 #endif /* INET6 */
  797                         error = tcp_connect(tp, nam, td);
  798                         if (error)
  799                                 goto out;
  800                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
  801                         tcp_mss(tp, -1);
  802                 }
  803                 if (flags & PRUS_EOF) {
  804                         /*
  805                          * Close the send side of the connection after
  806                          * the data is sent.
  807                          */
  808                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
  809                         socantsendmore(so);
  810                         tcp_usrclosed(tp);
  811                 }
  812                 if (headlocked) {
  813                         INP_INFO_WUNLOCK(&tcbinfo);
  814                         headlocked = 0;
  815                 }
  816                 if (!(inp->inp_flags & INP_DROPPED)) {
  817                         if (flags & PRUS_MORETOCOME)
  818                                 tp->t_flags |= TF_MORETOCOME;
  819                         error = tcp_output_send(tp);
  820                         if (flags & PRUS_MORETOCOME)
  821                                 tp->t_flags &= ~TF_MORETOCOME;
  822                 }
  823         } else {
  824                 /*
  825                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
  826                  */
  827                 SOCKBUF_LOCK(&so->so_snd);
  828                 if (sbspace(&so->so_snd) < -512) {
  829                         SOCKBUF_UNLOCK(&so->so_snd);
  830                         m_freem(m);
  831                         error = ENOBUFS;
  832                         goto out;
  833                 }
  834                 /*
  835                  * According to RFC961 (Assigned Protocols),
  836                  * the urgent pointer points to the last octet
  837                  * of urgent data.  We continue, however,
  838                  * to consider it to indicate the first octet
  839                  * of data past the urgent section.
  840                  * Otherwise, snd_up should be one lower.
  841                  */
  842                 sbappendstream_locked(&so->so_snd, m);
  843                 SOCKBUF_UNLOCK(&so->so_snd);
  844                 if (nam && tp->t_state < TCPS_SYN_SENT) {
  845                         /*
  846                          * Do implied connect if not yet connected,
  847                          * initialize window to default value, and
  848                          * initialize maxseg/maxopd using peer's cached
  849                          * MSS.
  850                          */
  851                         INP_INFO_WLOCK_ASSERT(&tcbinfo);
  852 #ifdef INET6
  853                         if (isipv6)
  854                                 error = tcp6_connect(tp, nam, td);
  855                         else
  856 #endif /* INET6 */
  857                         error = tcp_connect(tp, nam, td);
  858                         if (error)
  859                                 goto out;
  860                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
  861                         tcp_mss(tp, -1);
  862                         INP_INFO_WUNLOCK(&tcbinfo);
  863                         headlocked = 0;
  864                 } else if (nam) {
  865                         INP_INFO_WUNLOCK(&tcbinfo);
  866                         headlocked = 0;
  867                 }
  868                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
  869                 tp->t_flags |= TF_FORCEDATA;
  870                 error = tcp_output_send(tp);
  871                 tp->t_flags &= ~TF_FORCEDATA;
  872         }
  873 out:
  874         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
  875                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
  876         INP_WUNLOCK(inp);
  877         if (headlocked)
  878                 INP_INFO_WUNLOCK(&tcbinfo);
  879         return (error);
  880 }
  881 
  882 /*
  883  * Abort the TCP.  Drop the connection abruptly.
  884  */
  885 static void
  886 tcp_usr_abort(struct socket *so)
  887 {
  888         struct inpcb *inp;
  889         struct tcpcb *tp = NULL;
  890         TCPDEBUG0;
  891 
  892         inp = sotoinpcb(so);
  893         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
  894 
  895         INP_INFO_WLOCK(&tcbinfo);
  896         INP_WLOCK(inp);
  897         KASSERT(inp->inp_socket != NULL,
  898             ("tcp_usr_abort: inp_socket == NULL"));
  899 
  900         /*
  901          * If we still have full TCP state, and we're not dropped, drop.
  902          */
  903         if (!(inp->inp_flags & INP_TIMEWAIT) &&
  904             !(inp->inp_flags & INP_DROPPED)) {
  905                 tp = intotcpcb(inp);
  906                 TCPDEBUG1();
  907                 tcp_drop(tp, ECONNABORTED);
  908                 TCPDEBUG2(PRU_ABORT);
  909         }
  910         if (!(inp->inp_flags & INP_DROPPED)) {
  911                 SOCK_LOCK(so);
  912                 so->so_state |= SS_PROTOREF;
  913                 SOCK_UNLOCK(so);
  914                 inp->inp_flags |= INP_SOCKREF;
  915         }
  916         INP_WUNLOCK(inp);
  917         INP_INFO_WUNLOCK(&tcbinfo);
  918 }
  919 
  920 /*
  921  * TCP socket is closed.  Start friendly disconnect.
  922  */
  923 static void
  924 tcp_usr_close(struct socket *so)
  925 {
  926         struct inpcb *inp;
  927         struct tcpcb *tp = NULL;
  928         TCPDEBUG0;
  929 
  930         inp = sotoinpcb(so);
  931         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
  932 
  933         INP_INFO_WLOCK(&tcbinfo);
  934         INP_WLOCK(inp);
  935         KASSERT(inp->inp_socket != NULL,
  936             ("tcp_usr_close: inp_socket == NULL"));
  937 
  938         /*
  939          * If we still have full TCP state, and we're not dropped, initiate
  940          * a disconnect.
  941          */
  942         if (!(inp->inp_flags & INP_TIMEWAIT) &&
  943             !(inp->inp_flags & INP_DROPPED)) {
  944                 tp = intotcpcb(inp);
  945                 TCPDEBUG1();
  946                 tcp_disconnect(tp);
  947                 TCPDEBUG2(PRU_CLOSE);
  948         }
  949         if (!(inp->inp_flags & INP_DROPPED)) {
  950                 SOCK_LOCK(so);
  951                 so->so_state |= SS_PROTOREF;
  952                 SOCK_UNLOCK(so);
  953                 inp->inp_flags |= INP_SOCKREF;
  954         }
  955         INP_WUNLOCK(inp);
  956         INP_INFO_WUNLOCK(&tcbinfo);
  957 }
  958 
  959 /*
  960  * Receive out-of-band data.
  961  */
  962 static int
  963 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
  964 {
  965         int error = 0;
  966         struct inpcb *inp;
  967         struct tcpcb *tp = NULL;
  968 
  969         TCPDEBUG0;
  970         inp = sotoinpcb(so);
  971         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
  972         INP_WLOCK(inp);
  973         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  974                 error = ECONNRESET;
  975                 goto out;
  976         }
  977         tp = intotcpcb(inp);
  978         TCPDEBUG1();
  979         if ((so->so_oobmark == 0 &&
  980              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
  981             so->so_options & SO_OOBINLINE ||
  982             tp->t_oobflags & TCPOOB_HADDATA) {
  983                 error = EINVAL;
  984                 goto out;
  985         }
  986         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
  987                 error = EWOULDBLOCK;
  988                 goto out;
  989         }
  990         m->m_len = 1;
  991         *mtod(m, caddr_t) = tp->t_iobc;
  992         if ((flags & MSG_PEEK) == 0)
  993                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
  994 
  995 out:
  996         TCPDEBUG2(PRU_RCVOOB);
  997         INP_WUNLOCK(inp);
  998         return (error);
  999 }
 1000 
 1001 struct pr_usrreqs tcp_usrreqs = {
 1002         .pru_abort =            tcp_usr_abort,
 1003         .pru_accept =           tcp_usr_accept,
 1004         .pru_attach =           tcp_usr_attach,
 1005         .pru_bind =             tcp_usr_bind,
 1006         .pru_connect =          tcp_usr_connect,
 1007         .pru_control =          in_control,
 1008         .pru_detach =           tcp_usr_detach,
 1009         .pru_disconnect =       tcp_usr_disconnect,
 1010         .pru_listen =           tcp_usr_listen,
 1011         .pru_peeraddr =         in_getpeeraddr,
 1012         .pru_rcvd =             tcp_usr_rcvd,
 1013         .pru_rcvoob =           tcp_usr_rcvoob,
 1014         .pru_send =             tcp_usr_send,
 1015         .pru_shutdown =         tcp_usr_shutdown,
 1016         .pru_sockaddr =         in_getsockaddr,
 1017         .pru_sosetlabel =       in_pcbsosetlabel,
 1018         .pru_close =            tcp_usr_close,
 1019 };
 1020 
 1021 #ifdef INET6
 1022 struct pr_usrreqs tcp6_usrreqs = {
 1023         .pru_abort =            tcp_usr_abort,
 1024         .pru_accept =           tcp6_usr_accept,
 1025         .pru_attach =           tcp_usr_attach,
 1026         .pru_bind =             tcp6_usr_bind,
 1027         .pru_connect =          tcp6_usr_connect,
 1028         .pru_control =          in6_control,
 1029         .pru_detach =           tcp_usr_detach,
 1030         .pru_disconnect =       tcp_usr_disconnect,
 1031         .pru_listen =           tcp6_usr_listen,
 1032         .pru_peeraddr =         in6_mapped_peeraddr,
 1033         .pru_rcvd =             tcp_usr_rcvd,
 1034         .pru_rcvoob =           tcp_usr_rcvoob,
 1035         .pru_send =             tcp_usr_send,
 1036         .pru_shutdown =         tcp_usr_shutdown,
 1037         .pru_sockaddr =         in6_mapped_sockaddr,
 1038         .pru_sosetlabel =       in_pcbsosetlabel,
 1039         .pru_close =            tcp_usr_close,
 1040 };
 1041 #endif /* INET6 */
 1042 
 1043 /*
 1044  * Common subroutine to open a TCP connection to remote host specified
 1045  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
 1046  * port number if needed.  Call in_pcbconnect_setup to do the routing and
 1047  * to choose a local host address (interface).  If there is an existing
 1048  * incarnation of the same connection in TIME-WAIT state and if the remote
 1049  * host was sending CC options and if the connection duration was < MSL, then
 1050  * truncate the previous TIME-WAIT state and proceed.
 1051  * Initialize connection parameters and enter SYN-SENT state.
 1052  */
 1053 static int
 1054 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
 1055 {
 1056         struct inpcb *inp = tp->t_inpcb, *oinp;
 1057         struct socket *so = inp->inp_socket;
 1058         struct in_addr laddr;
 1059         u_short lport;
 1060         int error;
 1061 
 1062         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 1063         INP_WLOCK_ASSERT(inp);
 1064 
 1065         if (inp->inp_lport == 0) {
 1066                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 1067                 if (error)
 1068                         return error;
 1069         }
 1070 
 1071         /*
 1072          * Cannot simply call in_pcbconnect, because there might be an
 1073          * earlier incarnation of this same connection still in
 1074          * TIME_WAIT state, creating an ADDRINUSE error.
 1075          */
 1076         laddr = inp->inp_laddr;
 1077         lport = inp->inp_lport;
 1078         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
 1079             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
 1080         if (error && oinp == NULL)
 1081                 return error;
 1082         if (oinp)
 1083                 return EADDRINUSE;
 1084         inp->inp_laddr = laddr;
 1085         in_pcbrehash(inp);
 1086 
 1087         /*
 1088          * Compute window scaling to request:
 1089          * Scale to fit into sweet spot.  See tcp_syncache.c.
 1090          * XXX: This should move to tcp_output().
 1091          */
 1092         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
 1093             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
 1094                 tp->request_r_scale++;
 1095 
 1096         soisconnecting(so);
 1097         tcpstat.tcps_connattempt++;
 1098         tp->t_state = TCPS_SYN_SENT;
 1099         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
 1100         tp->iss = tcp_new_isn(tp);
 1101         tp->t_bw_rtseq = tp->iss;
 1102         tcp_sendseqinit(tp);
 1103 
 1104         return 0;
 1105 }
 1106 
 1107 #ifdef INET6
 1108 static int
 1109 tcp6_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 sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 1114         struct in6_addr addr6;
 1115         int error;
 1116 
 1117         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 1118         INP_WLOCK_ASSERT(inp);
 1119 
 1120         if (inp->inp_lport == 0) {
 1121                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 1122                 if (error)
 1123                         return error;
 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          * in6_pcbladdr() also handles scope zone IDs.
 1131          */
 1132         error = in6_pcbladdr(inp, nam, &addr6);
 1133         if (error)
 1134                 return error;
 1135         oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
 1136                                   &sin6->sin6_addr, sin6->sin6_port,
 1137                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 1138                                   ? &addr6
 1139                                   : &inp->in6p_laddr,
 1140                                   inp->inp_lport,  0, NULL);
 1141         if (oinp)
 1142                 return EADDRINUSE;
 1143         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 1144                 inp->in6p_laddr = addr6;
 1145         inp->in6p_faddr = sin6->sin6_addr;
 1146         inp->inp_fport = sin6->sin6_port;
 1147         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 1148         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 1149         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
 1150                 inp->inp_flow |=
 1151                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 1152         in_pcbrehash(inp);
 1153 
 1154         /* Compute window scaling to request.  */
 1155         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
 1156             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
 1157                 tp->request_r_scale++;
 1158 
 1159         soisconnecting(so);
 1160         tcpstat.tcps_connattempt++;
 1161         tp->t_state = TCPS_SYN_SENT;
 1162         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
 1163         tp->iss = tcp_new_isn(tp);
 1164         tp->t_bw_rtseq = tp->iss;
 1165         tcp_sendseqinit(tp);
 1166 
 1167         return 0;
 1168 }
 1169 #endif /* INET6 */
 1170 
 1171 /*
 1172  * Export TCP internal state information via a struct tcp_info, based on the
 1173  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
 1174  * (TCP state machine, etc).  We export all information using FreeBSD-native
 1175  * constants -- for example, the numeric values for tcpi_state will differ
 1176  * from Linux.
 1177  */
 1178 static void
 1179 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
 1180 {
 1181 
 1182         INP_WLOCK_ASSERT(tp->t_inpcb);
 1183         bzero(ti, sizeof(*ti));
 1184 
 1185         ti->tcpi_state = tp->t_state;
 1186         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
 1187                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
 1188         if (tp->t_flags & TF_SACK_PERMIT)
 1189                 ti->tcpi_options |= TCPI_OPT_SACK;
 1190         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
 1191                 ti->tcpi_options |= TCPI_OPT_WSCALE;
 1192                 ti->tcpi_snd_wscale = tp->snd_scale;
 1193                 ti->tcpi_rcv_wscale = tp->rcv_scale;
 1194         }
 1195 
 1196         ti->tcpi_rto = tp->t_rxtcur * tick;
 1197         ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
 1198         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
 1199         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
 1200 
 1201         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
 1202         ti->tcpi_snd_cwnd = tp->snd_cwnd;
 1203 
 1204         /*
 1205          * FreeBSD-specific extension fields for tcp_info.
 1206          */
 1207         ti->tcpi_rcv_space = tp->rcv_wnd;
 1208         ti->tcpi_rcv_nxt = tp->rcv_nxt;
 1209         ti->tcpi_snd_wnd = tp->snd_wnd;
 1210         ti->tcpi_snd_bwnd = tp->snd_bwnd;
 1211         ti->tcpi_snd_nxt = tp->snd_nxt;
 1212         ti->tcpi_snd_mss = tp->t_maxseg;
 1213         ti->tcpi_rcv_mss = tp->t_maxseg;
 1214         if (tp->t_flags & TF_TOE)
 1215                 ti->tcpi_options |= TCPI_OPT_TOE;
 1216 }
 1217 
 1218 /*
 1219  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
 1220  * socket option arguments.  When it re-acquires the lock after the copy, it
 1221  * has to revalidate that the connection is still valid for the socket
 1222  * option.
 1223  */
 1224 #define INP_WLOCK_RECHECK(inp) do {                                     \
 1225         INP_WLOCK(inp);                                                 \
 1226         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
 1227                 INP_WUNLOCK(inp);                                       \
 1228                 return (ECONNRESET);                                    \
 1229         }                                                               \
 1230         tp = intotcpcb(inp);                                            \
 1231 } while(0)
 1232 
 1233 int
 1234 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
 1235 {
 1236         int     error, opt, optval;
 1237         struct  inpcb *inp;
 1238         struct  tcpcb *tp;
 1239         struct  tcp_info ti;
 1240 
 1241         error = 0;
 1242         inp = sotoinpcb(so);
 1243         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
 1244         INP_WLOCK(inp);
 1245         if (sopt->sopt_level != IPPROTO_TCP) {
 1246 #ifdef INET6
 1247                 if (inp->inp_vflag & INP_IPV6PROTO) {
 1248                         INP_WUNLOCK(inp);
 1249                         error = ip6_ctloutput(so, sopt);
 1250                 } else {
 1251 #endif /* INET6 */
 1252                         INP_WUNLOCK(inp);
 1253                         error = ip_ctloutput(so, sopt);
 1254 #ifdef INET6
 1255                 }
 1256 #endif
 1257                 return (error);
 1258         }
 1259         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 1260                 INP_WUNLOCK(inp);
 1261                 return (ECONNRESET);
 1262         }
 1263 
 1264         switch (sopt->sopt_dir) {
 1265         case SOPT_SET:
 1266                 switch (sopt->sopt_name) {
 1267 #ifdef TCP_SIGNATURE
 1268                 case TCP_MD5SIG:
 1269                         INP_WUNLOCK(inp);
 1270                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1271                             sizeof optval);
 1272                         if (error)
 1273                                 return (error);
 1274 
 1275                         INP_WLOCK_RECHECK(inp);
 1276                         if (optval > 0)
 1277                                 tp->t_flags |= TF_SIGNATURE;
 1278                         else
 1279                                 tp->t_flags &= ~TF_SIGNATURE;
 1280                         INP_WUNLOCK(inp);
 1281                         break;
 1282 #endif /* TCP_SIGNATURE */
 1283                 case TCP_NODELAY:
 1284                 case TCP_NOOPT:
 1285                         INP_WUNLOCK(inp);
 1286                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1287                             sizeof optval);
 1288                         if (error)
 1289                                 return (error);
 1290 
 1291                         INP_WLOCK_RECHECK(inp);
 1292                         switch (sopt->sopt_name) {
 1293                         case TCP_NODELAY:
 1294                                 opt = TF_NODELAY;
 1295                                 break;
 1296                         case TCP_NOOPT:
 1297                                 opt = TF_NOOPT;
 1298                                 break;
 1299                         default:
 1300                                 opt = 0; /* dead code to fool gcc */
 1301                                 break;
 1302                         }
 1303 
 1304                         if (optval)
 1305                                 tp->t_flags |= opt;
 1306                         else
 1307                                 tp->t_flags &= ~opt;
 1308                         INP_WUNLOCK(inp);
 1309                         break;
 1310 
 1311                 case TCP_NOPUSH:
 1312                         INP_WUNLOCK(inp);
 1313                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1314                             sizeof optval);
 1315                         if (error)
 1316                                 return (error);
 1317 
 1318                         INP_WLOCK_RECHECK(inp);
 1319                         if (optval)
 1320                                 tp->t_flags |= TF_NOPUSH;
 1321                         else if (tp->t_flags & TF_NOPUSH) {
 1322                                 tp->t_flags &= ~TF_NOPUSH;
 1323                                 if (TCPS_HAVEESTABLISHED(tp->t_state))
 1324                                         error = tcp_output(tp);
 1325                         }
 1326                         INP_WUNLOCK(inp);
 1327                         break;
 1328 
 1329                 case TCP_MAXSEG:
 1330                         INP_WUNLOCK(inp);
 1331                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1332                             sizeof optval);
 1333                         if (error)
 1334                                 return (error);
 1335 
 1336                         INP_WLOCK_RECHECK(inp);
 1337                         if (optval > 0 && optval <= tp->t_maxseg &&
 1338                             optval + 40 >= tcp_minmss)
 1339                                 tp->t_maxseg = optval;
 1340                         else
 1341                                 error = EINVAL;
 1342                         INP_WUNLOCK(inp);
 1343                         break;
 1344 
 1345                 case TCP_INFO:
 1346                         INP_WUNLOCK(inp);
 1347                         error = EINVAL;
 1348                         break;
 1349 
 1350                 default:
 1351                         INP_WUNLOCK(inp);
 1352                         error = ENOPROTOOPT;
 1353                         break;
 1354                 }
 1355                 break;
 1356 
 1357         case SOPT_GET:
 1358                 tp = intotcpcb(inp);
 1359                 switch (sopt->sopt_name) {
 1360 #ifdef TCP_SIGNATURE
 1361                 case TCP_MD5SIG:
 1362                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
 1363                         INP_WUNLOCK(inp);
 1364                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1365                         break;
 1366 #endif
 1367 
 1368                 case TCP_NODELAY:
 1369                         optval = tp->t_flags & TF_NODELAY;
 1370                         INP_WUNLOCK(inp);
 1371                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1372                         break;
 1373                 case TCP_MAXSEG:
 1374                         optval = tp->t_maxseg;
 1375                         INP_WUNLOCK(inp);
 1376                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1377                         break;
 1378                 case TCP_NOOPT:
 1379                         optval = tp->t_flags & TF_NOOPT;
 1380                         INP_WUNLOCK(inp);
 1381                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1382                         break;
 1383                 case TCP_NOPUSH:
 1384                         optval = tp->t_flags & TF_NOPUSH;
 1385                         INP_WUNLOCK(inp);
 1386                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1387                         break;
 1388                 case TCP_INFO:
 1389                         tcp_fill_info(tp, &ti);
 1390                         INP_WUNLOCK(inp);
 1391                         error = sooptcopyout(sopt, &ti, sizeof ti);
 1392                         break;
 1393                 default:
 1394                         INP_WUNLOCK(inp);
 1395                         error = ENOPROTOOPT;
 1396                         break;
 1397                 }
 1398                 break;
 1399         }
 1400         return (error);
 1401 }
 1402 #undef INP_WLOCK_RECHECK
 1403 
 1404 /*
 1405  * tcp_sendspace and tcp_recvspace are the default send and receive window
 1406  * sizes, respectively.  These are obsolescent (this information should
 1407  * be set by the route).
 1408  */
 1409 u_long  tcp_sendspace = 1024*32;
 1410 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
 1411     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
 1412 u_long  tcp_recvspace = 1024*64;
 1413 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 1414     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
 1415 
 1416 /*
 1417  * Attach TCP protocol to socket, allocating
 1418  * internet protocol control block, tcp control block,
 1419  * bufer space, and entering LISTEN state if to accept connections.
 1420  */
 1421 static int
 1422 tcp_attach(struct socket *so)
 1423 {
 1424         struct tcpcb *tp;
 1425         struct inpcb *inp;
 1426         int error;
 1427 
 1428         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 1429                 error = soreserve(so, tcp_sendspace, tcp_recvspace);
 1430                 if (error)
 1431                         return (error);
 1432         }
 1433         so->so_rcv.sb_flags |= SB_AUTOSIZE;
 1434         so->so_snd.sb_flags |= SB_AUTOSIZE;
 1435         INP_INFO_WLOCK(&tcbinfo);
 1436         error = in_pcballoc(so, &tcbinfo);
 1437         if (error) {
 1438                 INP_INFO_WUNLOCK(&tcbinfo);
 1439                 return (error);
 1440         }
 1441         inp = sotoinpcb(so);
 1442 #ifdef INET6
 1443         if (inp->inp_vflag & INP_IPV6PROTO) {
 1444                 inp->inp_vflag |= INP_IPV6;
 1445                 inp->in6p_hops = -1;    /* use kernel default */
 1446         }
 1447         else
 1448 #endif
 1449         inp->inp_vflag |= INP_IPV4;
 1450         tp = tcp_newtcpcb(inp);
 1451         if (tp == NULL) {
 1452                 in_pcbdetach(inp);
 1453                 in_pcbfree(inp);
 1454                 INP_INFO_WUNLOCK(&tcbinfo);
 1455                 return (ENOBUFS);
 1456         }
 1457         tp->t_state = TCPS_CLOSED;
 1458         INP_WUNLOCK(inp);
 1459         INP_INFO_WUNLOCK(&tcbinfo);
 1460         return (0);
 1461 }
 1462 
 1463 /*
 1464  * Initiate (or continue) disconnect.
 1465  * If embryonic state, just send reset (once).
 1466  * If in ``let data drain'' option and linger null, just drop.
 1467  * Otherwise (hard), mark socket disconnecting and drop
 1468  * current input data; switch states based on user close, and
 1469  * send segment to peer (with FIN).
 1470  */
 1471 static void
 1472 tcp_disconnect(struct tcpcb *tp)
 1473 {
 1474         struct inpcb *inp = tp->t_inpcb;
 1475         struct socket *so = inp->inp_socket;
 1476 
 1477         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 1478         INP_WLOCK_ASSERT(inp);
 1479 
 1480         /*
 1481          * Neither tcp_close() nor tcp_drop() should return NULL, as the
 1482          * socket is still open.
 1483          */
 1484         if (tp->t_state < TCPS_ESTABLISHED) {
 1485                 tp = tcp_close(tp);
 1486                 KASSERT(tp != NULL,
 1487                     ("tcp_disconnect: tcp_close() returned NULL"));
 1488         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
 1489                 tp = tcp_drop(tp, 0);
 1490                 KASSERT(tp != NULL,
 1491                     ("tcp_disconnect: tcp_drop() returned NULL"));
 1492         } else {
 1493                 soisdisconnecting(so);
 1494                 sbflush(&so->so_rcv);
 1495                 tcp_usrclosed(tp);
 1496                 if (!(inp->inp_flags & INP_DROPPED))
 1497                         tcp_output_disconnect(tp);
 1498         }
 1499 }
 1500 
 1501 /*
 1502  * User issued close, and wish to trail through shutdown states:
 1503  * if never received SYN, just forget it.  If got a SYN from peer,
 1504  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
 1505  * If already got a FIN from peer, then almost done; go to LAST_ACK
 1506  * state.  In all other cases, have already sent FIN to peer (e.g.
 1507  * after PRU_SHUTDOWN), and just have to play tedious game waiting
 1508  * for peer to send FIN or not respond to keep-alives, etc.
 1509  * We can let the user exit from the close as soon as the FIN is acked.
 1510  */
 1511 static void
 1512 tcp_usrclosed(struct tcpcb *tp)
 1513 {
 1514 
 1515         INP_INFO_WLOCK_ASSERT(&tcbinfo);
 1516         INP_WLOCK_ASSERT(tp->t_inpcb);
 1517 
 1518         switch (tp->t_state) {
 1519         case TCPS_LISTEN:
 1520                 tcp_offload_listen_close(tp);
 1521                 /* FALLTHROUGH */
 1522         case TCPS_CLOSED:
 1523                 tp->t_state = TCPS_CLOSED;
 1524                 tp = tcp_close(tp);
 1525                 /*
 1526                  * tcp_close() should never return NULL here as the socket is
 1527                  * still open.
 1528                  */
 1529                 KASSERT(tp != NULL,
 1530                     ("tcp_usrclosed: tcp_close() returned NULL"));
 1531                 break;
 1532 
 1533         case TCPS_SYN_SENT:
 1534         case TCPS_SYN_RECEIVED:
 1535                 tp->t_flags |= TF_NEEDFIN;
 1536                 break;
 1537 
 1538         case TCPS_ESTABLISHED:
 1539                 tp->t_state = TCPS_FIN_WAIT_1;
 1540                 break;
 1541 
 1542         case TCPS_CLOSE_WAIT:
 1543                 tp->t_state = TCPS_LAST_ACK;
 1544                 break;
 1545         }
 1546         if (tp->t_state >= TCPS_FIN_WAIT_2) {
 1547                 soisdisconnected(tp->t_inpcb->inp_socket);
 1548                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
 1549                 if (tp->t_state == TCPS_FIN_WAIT_2) {
 1550                         int timeout;
 1551 
 1552                         timeout = (tcp_fast_finwait2_recycle) ? 
 1553                             tcp_finwait2_timeout : tcp_maxidle;
 1554                         tcp_timer_activate(tp, TT_2MSL, timeout);
 1555                 }
 1556         }
 1557 }
 1558 
 1559 #ifdef DDB
 1560 static void
 1561 db_print_indent(int indent)
 1562 {
 1563         int i;
 1564 
 1565         for (i = 0; i < indent; i++)
 1566                 db_printf(" ");
 1567 }
 1568 
 1569 static void
 1570 db_print_tstate(int t_state)
 1571 {
 1572 
 1573         switch (t_state) {
 1574         case TCPS_CLOSED:
 1575                 db_printf("TCPS_CLOSED");
 1576                 return;
 1577 
 1578         case TCPS_LISTEN:
 1579                 db_printf("TCPS_LISTEN");
 1580                 return;
 1581 
 1582         case TCPS_SYN_SENT:
 1583                 db_printf("TCPS_SYN_SENT");
 1584                 return;
 1585 
 1586         case TCPS_SYN_RECEIVED:
 1587                 db_printf("TCPS_SYN_RECEIVED");
 1588                 return;
 1589 
 1590         case TCPS_ESTABLISHED:
 1591                 db_printf("TCPS_ESTABLISHED");
 1592                 return;
 1593 
 1594         case TCPS_CLOSE_WAIT:
 1595                 db_printf("TCPS_CLOSE_WAIT");
 1596                 return;
 1597 
 1598         case TCPS_FIN_WAIT_1:
 1599                 db_printf("TCPS_FIN_WAIT_1");
 1600                 return;
 1601 
 1602         case TCPS_CLOSING:
 1603                 db_printf("TCPS_CLOSING");
 1604                 return;
 1605 
 1606         case TCPS_LAST_ACK:
 1607                 db_printf("TCPS_LAST_ACK");
 1608                 return;
 1609 
 1610         case TCPS_FIN_WAIT_2:
 1611                 db_printf("TCPS_FIN_WAIT_2");
 1612                 return;
 1613 
 1614         case TCPS_TIME_WAIT:
 1615                 db_printf("TCPS_TIME_WAIT");
 1616                 return;
 1617 
 1618         default:
 1619                 db_printf("unknown");
 1620                 return;
 1621         }
 1622 }
 1623 
 1624 static void
 1625 db_print_tflags(u_int t_flags)
 1626 {
 1627         int comma;
 1628 
 1629         comma = 0;
 1630         if (t_flags & TF_ACKNOW) {
 1631                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
 1632                 comma = 1;
 1633         }
 1634         if (t_flags & TF_DELACK) {
 1635                 db_printf("%sTF_DELACK", comma ? ", " : "");
 1636                 comma = 1;
 1637         }
 1638         if (t_flags & TF_NODELAY) {
 1639                 db_printf("%sTF_NODELAY", comma ? ", " : "");
 1640                 comma = 1;
 1641         }
 1642         if (t_flags & TF_NOOPT) {
 1643                 db_printf("%sTF_NOOPT", comma ? ", " : "");
 1644                 comma = 1;
 1645         }
 1646         if (t_flags & TF_SENTFIN) {
 1647                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
 1648                 comma = 1;
 1649         }
 1650         if (t_flags & TF_REQ_SCALE) {
 1651                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
 1652                 comma = 1;
 1653         }
 1654         if (t_flags & TF_RCVD_SCALE) {
 1655                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
 1656                 comma = 1;
 1657         }
 1658         if (t_flags & TF_REQ_TSTMP) {
 1659                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
 1660                 comma = 1;
 1661         }
 1662         if (t_flags & TF_RCVD_TSTMP) {
 1663                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
 1664                 comma = 1;
 1665         }
 1666         if (t_flags & TF_SACK_PERMIT) {
 1667                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
 1668                 comma = 1;
 1669         }
 1670         if (t_flags & TF_NEEDSYN) {
 1671                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
 1672                 comma = 1;
 1673         }
 1674         if (t_flags & TF_NEEDFIN) {
 1675                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
 1676                 comma = 1;
 1677         }
 1678         if (t_flags & TF_NOPUSH) {
 1679                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
 1680                 comma = 1;
 1681         }
 1682         if (t_flags & TF_NOPUSH) {
 1683                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
 1684                 comma = 1;
 1685         }
 1686         if (t_flags & TF_MORETOCOME) {
 1687                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
 1688                 comma = 1;
 1689         }
 1690         if (t_flags & TF_LQ_OVERFLOW) {
 1691                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
 1692                 comma = 1;
 1693         }
 1694         if (t_flags & TF_LASTIDLE) {
 1695                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
 1696                 comma = 1;
 1697         }
 1698         if (t_flags & TF_RXWIN0SENT) {
 1699                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
 1700                 comma = 1;
 1701         }
 1702         if (t_flags & TF_FASTRECOVERY) {
 1703                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
 1704                 comma = 1;
 1705         }
 1706         if (t_flags & TF_WASFRECOVERY) {
 1707                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
 1708                 comma = 1;
 1709         }
 1710         if (t_flags & TF_SIGNATURE) {
 1711                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
 1712                 comma = 1;
 1713         }
 1714         if (t_flags & TF_FORCEDATA) {
 1715                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
 1716                 comma = 1;
 1717         }
 1718         if (t_flags & TF_TSO) {
 1719                 db_printf("%sTF_TSO", comma ? ", " : "");
 1720                 comma = 1;
 1721         }
 1722 }
 1723 
 1724 static void
 1725 db_print_toobflags(char t_oobflags)
 1726 {
 1727         int comma;
 1728 
 1729         comma = 0;
 1730         if (t_oobflags & TCPOOB_HAVEDATA) {
 1731                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
 1732                 comma = 1;
 1733         }
 1734         if (t_oobflags & TCPOOB_HADDATA) {
 1735                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
 1736                 comma = 1;
 1737         }
 1738 }
 1739 
 1740 static void
 1741 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
 1742 {
 1743 
 1744         db_print_indent(indent);
 1745         db_printf("%s at %p\n", name, tp);
 1746 
 1747         indent += 2;
 1748 
 1749         db_print_indent(indent);
 1750         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
 1751            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
 1752 
 1753         db_print_indent(indent);
 1754         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
 1755             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
 1756 
 1757         db_print_indent(indent);
 1758         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
 1759             &tp->t_timers->tt_delack, tp->t_inpcb);
 1760 
 1761         db_print_indent(indent);
 1762         db_printf("t_state: %d (", tp->t_state);
 1763         db_print_tstate(tp->t_state);
 1764         db_printf(")\n");
 1765 
 1766         db_print_indent(indent);
 1767         db_printf("t_flags: 0x%x (", tp->t_flags);
 1768         db_print_tflags(tp->t_flags);
 1769         db_printf(")\n");
 1770 
 1771         db_print_indent(indent);
 1772         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
 1773             tp->snd_una, tp->snd_max, tp->snd_nxt);
 1774 
 1775         db_print_indent(indent);
 1776         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
 1777            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
 1778 
 1779         db_print_indent(indent);
 1780         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
 1781             tp->iss, tp->irs, tp->rcv_nxt);
 1782 
 1783         db_print_indent(indent);
 1784         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
 1785             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
 1786 
 1787         db_print_indent(indent);
 1788         db_printf("snd_wnd: %lu   snd_cwnd: %lu   snd_bwnd: %lu\n",
 1789            tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
 1790 
 1791         db_print_indent(indent);
 1792         db_printf("snd_ssthresh: %lu   snd_bandwidth: %lu   snd_recover: "
 1793             "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
 1794             tp->snd_recover);
 1795 
 1796         db_print_indent(indent);
 1797         db_printf("t_maxopd: %u   t_rcvtime: %lu   t_startime: %lu\n",
 1798             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
 1799 
 1800         db_print_indent(indent);
 1801         db_printf("t_rttime: %d   t_rtsq: 0x%08x   t_bw_rtttime: %d\n",
 1802             tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
 1803 
 1804         db_print_indent(indent);
 1805         db_printf("t_bw_rtseq: 0x%08x   t_rxtcur: %d   t_maxseg: %u   "
 1806             "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
 1807             tp->t_srtt);
 1808 
 1809         db_print_indent(indent);
 1810         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
 1811             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
 1812             tp->t_rttbest);
 1813 
 1814         db_print_indent(indent);
 1815         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
 1816             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
 1817 
 1818         db_print_indent(indent);
 1819         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
 1820         db_print_toobflags(tp->t_oobflags);
 1821         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
 1822 
 1823         db_print_indent(indent);
 1824         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
 1825             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
 1826 
 1827         db_print_indent(indent);
 1828         db_printf("ts_recent: %u   ts_recent_age: %lu\n",
 1829             tp->ts_recent, tp->ts_recent_age);
 1830 
 1831         db_print_indent(indent);
 1832         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
 1833             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
 1834 
 1835         db_print_indent(indent);
 1836         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
 1837             "t_badrxtwin: %lu\n", tp->snd_ssthresh_prev,
 1838             tp->snd_recover_prev, tp->t_badrxtwin);
 1839 
 1840         db_print_indent(indent);
 1841         db_printf("snd_numholes: %d  snd_holes first: %p\n",
 1842             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
 1843 
 1844         db_print_indent(indent);
 1845         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
 1846             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
 1847 
 1848         /* Skip sackblks, sackhint. */
 1849 
 1850         db_print_indent(indent);
 1851         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
 1852             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
 1853 }
 1854 
 1855 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
 1856 {
 1857         struct tcpcb *tp;
 1858 
 1859         if (!have_addr) {
 1860                 db_printf("usage: show tcpcb <addr>\n");
 1861                 return;
 1862         }
 1863         tp = (struct tcpcb *)addr;
 1864 
 1865         db_print_tcpcb(tp, "tcpcb", 0);
 1866 }
 1867 #endif

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