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/8.3/sys/netinet/tcp_usrreq.c 231097 2012-02-06 18:47:07Z np $");
   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 #include <net/vnet.h>
   64 
   65 #include <netinet/cc.h>
   66 #include <netinet/in.h>
   67 #include <netinet/in_systm.h>
   68 #ifdef INET6
   69 #include <netinet/ip6.h>
   70 #endif
   71 #include <netinet/in_pcb.h>
   72 #ifdef INET6
   73 #include <netinet6/in6_pcb.h>
   74 #endif
   75 #include <netinet/in_var.h>
   76 #include <netinet/ip_var.h>
   77 #ifdef INET6
   78 #include <netinet6/ip6_var.h>
   79 #include <netinet6/scope6_var.h>
   80 #endif
   81 #include <netinet/tcp_fsm.h>
   82 #include <netinet/tcp_seq.h>
   83 #include <netinet/tcp_timer.h>
   84 #include <netinet/tcp_var.h>
   85 #include <netinet/tcpip.h>
   86 #ifdef TCPDEBUG
   87 #include <netinet/tcp_debug.h>
   88 #endif
   89 #include <netinet/tcp_offload.h>
   90 
   91 /*
   92  * TCP protocol interface to socket abstraction.
   93  */
   94 static int      tcp_attach(struct socket *);
   95 static int      tcp_connect(struct tcpcb *, struct sockaddr *,
   96                     struct thread *td);
   97 #ifdef INET6
   98 static int      tcp6_connect(struct tcpcb *, struct sockaddr *,
   99                     struct thread *td);
  100 #endif /* INET6 */
  101 static void     tcp_disconnect(struct tcpcb *);
  102 static void     tcp_usrclosed(struct tcpcb *);
  103 static void     tcp_fill_info(struct tcpcb *, struct tcp_info *);
  104 
  105 #ifdef TCPDEBUG
  106 #define TCPDEBUG0       int ostate = 0
  107 #define TCPDEBUG1()     ostate = tp ? tp->t_state : 0
  108 #define TCPDEBUG2(req)  if (tp && (so->so_options & SO_DEBUG)) \
  109                                 tcp_trace(TA_USER, ostate, tp, 0, 0, req)
  110 #else
  111 #define TCPDEBUG0
  112 #define TCPDEBUG1()
  113 #define TCPDEBUG2(req)
  114 #endif
  115 
  116 /*
  117  * TCP attaches to socket via pru_attach(), reserving space,
  118  * and an internet control block.
  119  */
  120 static int
  121 tcp_usr_attach(struct socket *so, int proto, struct thread *td)
  122 {
  123         struct inpcb *inp;
  124         struct tcpcb *tp = NULL;
  125         int error;
  126         TCPDEBUG0;
  127 
  128         inp = sotoinpcb(so);
  129         KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL"));
  130         TCPDEBUG1();
  131 
  132         error = tcp_attach(so);
  133         if (error)
  134                 goto out;
  135 
  136         if ((so->so_options & SO_LINGER) && so->so_linger == 0)
  137                 so->so_linger = TCP_LINGERTIME;
  138 
  139         inp = sotoinpcb(so);
  140         tp = intotcpcb(inp);
  141 out:
  142         TCPDEBUG2(PRU_ATTACH);
  143         return error;
  144 }
  145 
  146 /*
  147  * tcp_detach is called when the socket layer loses its final reference
  148  * to the socket, be it a file descriptor reference, a reference from TCP,
  149  * etc.  At this point, there is only one case in which we will keep around
  150  * inpcb state: time wait.
  151  *
  152  * This function can probably be re-absorbed back into tcp_usr_detach() now
  153  * that there is a single detach path.
  154  */
  155 static void
  156 tcp_detach(struct socket *so, struct inpcb *inp)
  157 {
  158         struct tcpcb *tp;
  159 
  160         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
  161         INP_WLOCK_ASSERT(inp);
  162 
  163         KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp"));
  164         KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so"));
  165 
  166         tp = intotcpcb(inp);
  167 
  168         if (inp->inp_flags & INP_TIMEWAIT) {
  169                 /*
  170                  * There are two cases to handle: one in which the time wait
  171                  * state is being discarded (INP_DROPPED), and one in which
  172                  * this connection will remain in timewait.  In the former,
  173                  * it is time to discard all state (except tcptw, which has
  174                  * already been discarded by the timewait close code, which
  175                  * should be further up the call stack somewhere).  In the
  176                  * latter case, we detach from the socket, but leave the pcb
  177                  * present until timewait ends.
  178                  *
  179                  * XXXRW: Would it be cleaner to free the tcptw here?
  180                  */
  181                 if (inp->inp_flags & INP_DROPPED) {
  182                         KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && "
  183                             "INP_DROPPED && tp != NULL"));
  184                         in_pcbdetach(inp);
  185                         in_pcbfree(inp);
  186                 } else {
  187                         in_pcbdetach(inp);
  188                         INP_WUNLOCK(inp);
  189                 }
  190         } else {
  191                 /*
  192                  * If the connection is not in timewait, we consider two
  193                  * two conditions: one in which no further processing is
  194                  * necessary (dropped || embryonic), and one in which TCP is
  195                  * not yet done, but no longer requires the socket, so the
  196                  * pcb will persist for the time being.
  197                  *
  198                  * XXXRW: Does the second case still occur?
  199                  */
  200                 if (inp->inp_flags & INP_DROPPED ||
  201                     tp->t_state < TCPS_SYN_SENT) {
  202                         tcp_discardcb(tp);
  203                         in_pcbdetach(inp);
  204                         in_pcbfree(inp);
  205                 } else {
  206                         in_pcbdetach(inp);
  207                         INP_WUNLOCK(inp);
  208                 }
  209         }
  210 }
  211 
  212 /*
  213  * pru_detach() detaches the TCP protocol from the socket.
  214  * If the protocol state is non-embryonic, then can't
  215  * do this directly: have to initiate a pru_disconnect(),
  216  * which may finish later; embryonic TCB's can just
  217  * be discarded here.
  218  */
  219 static void
  220 tcp_usr_detach(struct socket *so)
  221 {
  222         struct inpcb *inp;
  223 
  224         inp = sotoinpcb(so);
  225         KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL"));
  226         INP_INFO_WLOCK(&V_tcbinfo);
  227         INP_WLOCK(inp);
  228         KASSERT(inp->inp_socket != NULL,
  229             ("tcp_usr_detach: inp_socket == NULL"));
  230         tcp_detach(so, inp);
  231         INP_INFO_WUNLOCK(&V_tcbinfo);
  232 }
  233 
  234 /*
  235  * Give the socket an address.
  236  */
  237 static int
  238 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  239 {
  240         int error = 0;
  241         struct inpcb *inp;
  242         struct tcpcb *tp = NULL;
  243         struct sockaddr_in *sinp;
  244 
  245         sinp = (struct sockaddr_in *)nam;
  246         if (nam->sa_len != sizeof (*sinp))
  247                 return (EINVAL);
  248         /*
  249          * Must check for multicast addresses and disallow binding
  250          * to them.
  251          */
  252         if (sinp->sin_family == AF_INET &&
  253             IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
  254                 return (EAFNOSUPPORT);
  255 
  256         TCPDEBUG0;
  257         INP_INFO_WLOCK(&V_tcbinfo);
  258         inp = sotoinpcb(so);
  259         KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL"));
  260         INP_WLOCK(inp);
  261         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  262                 error = EINVAL;
  263                 goto out;
  264         }
  265         tp = intotcpcb(inp);
  266         TCPDEBUG1();
  267         error = in_pcbbind(inp, nam, td->td_ucred);
  268 out:
  269         TCPDEBUG2(PRU_BIND);
  270         INP_WUNLOCK(inp);
  271         INP_INFO_WUNLOCK(&V_tcbinfo);
  272 
  273         return (error);
  274 }
  275 
  276 #ifdef INET6
  277 static int
  278 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  279 {
  280         int error = 0;
  281         struct inpcb *inp;
  282         struct tcpcb *tp = NULL;
  283         struct sockaddr_in6 *sin6p;
  284 
  285         sin6p = (struct sockaddr_in6 *)nam;
  286         if (nam->sa_len != sizeof (*sin6p))
  287                 return (EINVAL);
  288         /*
  289          * Must check for multicast addresses and disallow binding
  290          * to them.
  291          */
  292         if (sin6p->sin6_family == AF_INET6 &&
  293             IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
  294                 return (EAFNOSUPPORT);
  295 
  296         TCPDEBUG0;
  297         INP_INFO_WLOCK(&V_tcbinfo);
  298         inp = sotoinpcb(so);
  299         KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL"));
  300         INP_WLOCK(inp);
  301         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  302                 error = EINVAL;
  303                 goto out;
  304         }
  305         tp = intotcpcb(inp);
  306         TCPDEBUG1();
  307         inp->inp_vflag &= ~INP_IPV4;
  308         inp->inp_vflag |= INP_IPV6;
  309         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
  310                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
  311                         inp->inp_vflag |= INP_IPV4;
  312                 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
  313                         struct sockaddr_in sin;
  314 
  315                         in6_sin6_2_sin(&sin, sin6p);
  316                         inp->inp_vflag |= INP_IPV4;
  317                         inp->inp_vflag &= ~INP_IPV6;
  318                         error = in_pcbbind(inp, (struct sockaddr *)&sin,
  319                             td->td_ucred);
  320                         goto out;
  321                 }
  322         }
  323         error = in6_pcbbind(inp, nam, td->td_ucred);
  324 out:
  325         TCPDEBUG2(PRU_BIND);
  326         INP_WUNLOCK(inp);
  327         INP_INFO_WUNLOCK(&V_tcbinfo);
  328         return (error);
  329 }
  330 #endif /* INET6 */
  331 
  332 /*
  333  * Prepare to accept connections.
  334  */
  335 static int
  336 tcp_usr_listen(struct socket *so, int backlog, struct thread *td)
  337 {
  338         int error = 0;
  339         struct inpcb *inp;
  340         struct tcpcb *tp = NULL;
  341 
  342         TCPDEBUG0;
  343         INP_INFO_WLOCK(&V_tcbinfo);
  344         inp = sotoinpcb(so);
  345         KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL"));
  346         INP_WLOCK(inp);
  347         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  348                 error = EINVAL;
  349                 goto out;
  350         }
  351         tp = intotcpcb(inp);
  352         TCPDEBUG1();
  353         SOCK_LOCK(so);
  354         error = solisten_proto_check(so);
  355         if (error == 0 && inp->inp_lport == 0)
  356                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
  357         if (error == 0) {
  358                 tp->t_state = TCPS_LISTEN;
  359                 solisten_proto(so, backlog);
  360                 tcp_offload_listen_open(tp);
  361         }
  362         SOCK_UNLOCK(so);
  363 
  364 out:
  365         TCPDEBUG2(PRU_LISTEN);
  366         INP_WUNLOCK(inp);
  367         INP_INFO_WUNLOCK(&V_tcbinfo);
  368         return (error);
  369 }
  370 
  371 #ifdef INET6
  372 static int
  373 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td)
  374 {
  375         int error = 0;
  376         struct inpcb *inp;
  377         struct tcpcb *tp = NULL;
  378 
  379         TCPDEBUG0;
  380         INP_INFO_WLOCK(&V_tcbinfo);
  381         inp = sotoinpcb(so);
  382         KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL"));
  383         INP_WLOCK(inp);
  384         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  385                 error = EINVAL;
  386                 goto out;
  387         }
  388         tp = intotcpcb(inp);
  389         TCPDEBUG1();
  390         SOCK_LOCK(so);
  391         error = solisten_proto_check(so);
  392         if (error == 0 && inp->inp_lport == 0) {
  393                 inp->inp_vflag &= ~INP_IPV4;
  394                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
  395                         inp->inp_vflag |= INP_IPV4;
  396                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
  397         }
  398         if (error == 0) {
  399                 tp->t_state = TCPS_LISTEN;
  400                 solisten_proto(so, backlog);
  401         }
  402         SOCK_UNLOCK(so);
  403 
  404 out:
  405         TCPDEBUG2(PRU_LISTEN);
  406         INP_WUNLOCK(inp);
  407         INP_INFO_WUNLOCK(&V_tcbinfo);
  408         return (error);
  409 }
  410 #endif /* INET6 */
  411 
  412 /*
  413  * Initiate connection to peer.
  414  * Create a template for use in transmissions on this connection.
  415  * Enter SYN_SENT state, and mark socket as connecting.
  416  * Start keep-alive timer, and seed output sequence space.
  417  * Send initial segment on connection.
  418  */
  419 static int
  420 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  421 {
  422         int error = 0;
  423         struct inpcb *inp;
  424         struct tcpcb *tp = NULL;
  425         struct sockaddr_in *sinp;
  426 
  427         sinp = (struct sockaddr_in *)nam;
  428         if (nam->sa_len != sizeof (*sinp))
  429                 return (EINVAL);
  430         /*
  431          * Must disallow TCP ``connections'' to multicast addresses.
  432          */
  433         if (sinp->sin_family == AF_INET
  434             && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr)))
  435                 return (EAFNOSUPPORT);
  436         if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0)
  437                 return (error);
  438 
  439         TCPDEBUG0;
  440         INP_INFO_WLOCK(&V_tcbinfo);
  441         inp = sotoinpcb(so);
  442         KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL"));
  443         INP_WLOCK(inp);
  444         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  445                 error = EINVAL;
  446                 goto out;
  447         }
  448         tp = intotcpcb(inp);
  449         TCPDEBUG1();
  450         if ((error = tcp_connect(tp, nam, td)) != 0)
  451                 goto out;
  452         error = tcp_output_connect(so, nam);
  453 out:
  454         TCPDEBUG2(PRU_CONNECT);
  455         INP_WUNLOCK(inp);
  456         INP_INFO_WUNLOCK(&V_tcbinfo);
  457         return (error);
  458 }
  459 
  460 #ifdef INET6
  461 static int
  462 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  463 {
  464         int error = 0;
  465         struct inpcb *inp;
  466         struct tcpcb *tp = NULL;
  467         struct sockaddr_in6 *sin6p;
  468 
  469         TCPDEBUG0;
  470 
  471         sin6p = (struct sockaddr_in6 *)nam;
  472         if (nam->sa_len != sizeof (*sin6p))
  473                 return (EINVAL);
  474         /*
  475          * Must disallow TCP ``connections'' to multicast addresses.
  476          */
  477         if (sin6p->sin6_family == AF_INET6
  478             && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr))
  479                 return (EAFNOSUPPORT);
  480 
  481         INP_INFO_WLOCK(&V_tcbinfo);
  482         inp = sotoinpcb(so);
  483         KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL"));
  484         INP_WLOCK(inp);
  485         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  486                 error = EINVAL;
  487                 goto out;
  488         }
  489         tp = intotcpcb(inp);
  490         TCPDEBUG1();
  491         if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
  492                 struct sockaddr_in sin;
  493 
  494                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
  495                         error = EINVAL;
  496                         goto out;
  497                 }
  498 
  499                 in6_sin6_2_sin(&sin, sin6p);
  500                 inp->inp_vflag |= INP_IPV4;
  501                 inp->inp_vflag &= ~INP_IPV6;
  502                 if ((error = prison_remote_ip4(td->td_ucred,
  503                     &sin.sin_addr)) != 0)
  504                         goto out;
  505                 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
  506                         goto out;
  507                 error = tcp_output_connect(so, nam);
  508                 goto out;
  509         }
  510         inp->inp_vflag &= ~INP_IPV4;
  511         inp->inp_vflag |= INP_IPV6;
  512         inp->inp_inc.inc_flags |= INC_ISIPV6;
  513         if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0)
  514                 goto out;
  515         if ((error = tcp6_connect(tp, nam, td)) != 0)
  516                 goto out;
  517         error = tcp_output_connect(so, nam);
  518 
  519 out:
  520         TCPDEBUG2(PRU_CONNECT);
  521         INP_WUNLOCK(inp);
  522         INP_INFO_WUNLOCK(&V_tcbinfo);
  523         return (error);
  524 }
  525 #endif /* INET6 */
  526 
  527 /*
  528  * Initiate disconnect from peer.
  529  * If connection never passed embryonic stage, just drop;
  530  * else if don't need to let data drain, then can just drop anyways,
  531  * else have to begin TCP shutdown process: mark socket disconnecting,
  532  * drain unread data, state switch to reflect user close, and
  533  * send segment (e.g. FIN) to peer.  Socket will be really disconnected
  534  * when peer sends FIN and acks ours.
  535  *
  536  * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
  537  */
  538 static int
  539 tcp_usr_disconnect(struct socket *so)
  540 {
  541         struct inpcb *inp;
  542         struct tcpcb *tp = NULL;
  543         int error = 0;
  544 
  545         TCPDEBUG0;
  546         INP_INFO_WLOCK(&V_tcbinfo);
  547         inp = sotoinpcb(so);
  548         KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL"));
  549         INP_WLOCK(inp);
  550         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  551                 error = ECONNRESET;
  552                 goto out;
  553         }
  554         tp = intotcpcb(inp);
  555         TCPDEBUG1();
  556         tcp_disconnect(tp);
  557 out:
  558         TCPDEBUG2(PRU_DISCONNECT);
  559         INP_WUNLOCK(inp);
  560         INP_INFO_WUNLOCK(&V_tcbinfo);
  561         return (error);
  562 }
  563 
  564 /*
  565  * Accept a connection.  Essentially all the work is done at higher levels;
  566  * just return the address of the peer, storing through addr.
  567  *
  568  * The rationale for acquiring the tcbinfo lock here is somewhat complicated,
  569  * and is described in detail in the commit log entry for r175612.  Acquiring
  570  * it delays an accept(2) racing with sonewconn(), which inserts the socket
  571  * before the inpcb address/port fields are initialized.  A better fix would
  572  * prevent the socket from being placed in the listen queue until all fields
  573  * are fully initialized.
  574  */
  575 static int
  576 tcp_usr_accept(struct socket *so, struct sockaddr **nam)
  577 {
  578         int error = 0;
  579         struct inpcb *inp = NULL;
  580         struct tcpcb *tp = NULL;
  581         struct in_addr addr;
  582         in_port_t port = 0;
  583         TCPDEBUG0;
  584 
  585         if (so->so_state & SS_ISDISCONNECTED)
  586                 return (ECONNABORTED);
  587 
  588         inp = sotoinpcb(so);
  589         KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL"));
  590         INP_INFO_RLOCK(&V_tcbinfo);
  591         INP_WLOCK(inp);
  592         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  593                 error = ECONNABORTED;
  594                 goto out;
  595         }
  596         tp = intotcpcb(inp);
  597         TCPDEBUG1();
  598 
  599         /*
  600          * We inline in_getpeeraddr and COMMON_END here, so that we can
  601          * copy the data of interest and defer the malloc until after we
  602          * release the lock.
  603          */
  604         port = inp->inp_fport;
  605         addr = inp->inp_faddr;
  606 
  607 out:
  608         TCPDEBUG2(PRU_ACCEPT);
  609         INP_WUNLOCK(inp);
  610         INP_INFO_RUNLOCK(&V_tcbinfo);
  611         if (error == 0)
  612                 *nam = in_sockaddr(port, &addr);
  613         return error;
  614 }
  615 
  616 #ifdef INET6
  617 static int
  618 tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
  619 {
  620         struct inpcb *inp = NULL;
  621         int error = 0;
  622         struct tcpcb *tp = NULL;
  623         struct in_addr addr;
  624         struct in6_addr addr6;
  625         in_port_t port = 0;
  626         int v4 = 0;
  627         TCPDEBUG0;
  628 
  629         if (so->so_state & SS_ISDISCONNECTED)
  630                 return (ECONNABORTED);
  631 
  632         inp = sotoinpcb(so);
  633         KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL"));
  634         INP_WLOCK(inp);
  635         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  636                 error = ECONNABORTED;
  637                 goto out;
  638         }
  639         tp = intotcpcb(inp);
  640         TCPDEBUG1();
  641 
  642         /*
  643          * We inline in6_mapped_peeraddr and COMMON_END here, so that we can
  644          * copy the data of interest and defer the malloc until after we
  645          * release the lock.
  646          */
  647         if (inp->inp_vflag & INP_IPV4) {
  648                 v4 = 1;
  649                 port = inp->inp_fport;
  650                 addr = inp->inp_faddr;
  651         } else {
  652                 port = inp->inp_fport;
  653                 addr6 = inp->in6p_faddr;
  654         }
  655 
  656 out:
  657         TCPDEBUG2(PRU_ACCEPT);
  658         INP_WUNLOCK(inp);
  659         if (error == 0) {
  660                 if (v4)
  661                         *nam = in6_v4mapsin6_sockaddr(port, &addr);
  662                 else
  663                         *nam = in6_sockaddr(port, &addr6);
  664         }
  665         return error;
  666 }
  667 #endif /* INET6 */
  668 
  669 /*
  670  * Mark the connection as being incapable of further output.
  671  */
  672 static int
  673 tcp_usr_shutdown(struct socket *so)
  674 {
  675         int error = 0;
  676         struct inpcb *inp;
  677         struct tcpcb *tp = NULL;
  678 
  679         TCPDEBUG0;
  680         INP_INFO_WLOCK(&V_tcbinfo);
  681         inp = sotoinpcb(so);
  682         KASSERT(inp != NULL, ("inp == NULL"));
  683         INP_WLOCK(inp);
  684         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  685                 error = ECONNRESET;
  686                 goto out;
  687         }
  688         tp = intotcpcb(inp);
  689         TCPDEBUG1();
  690         socantsendmore(so);
  691         tcp_usrclosed(tp);
  692         if (!(inp->inp_flags & INP_DROPPED))
  693                 error = tcp_output_disconnect(tp);
  694 
  695 out:
  696         TCPDEBUG2(PRU_SHUTDOWN);
  697         INP_WUNLOCK(inp);
  698         INP_INFO_WUNLOCK(&V_tcbinfo);
  699 
  700         return (error);
  701 }
  702 
  703 /*
  704  * After a receive, possibly send window update to peer.
  705  */
  706 static int
  707 tcp_usr_rcvd(struct socket *so, int flags)
  708 {
  709         struct inpcb *inp;
  710         struct tcpcb *tp = NULL;
  711         int error = 0;
  712 
  713         TCPDEBUG0;
  714         inp = sotoinpcb(so);
  715         KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL"));
  716         INP_WLOCK(inp);
  717         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  718                 error = ECONNRESET;
  719                 goto out;
  720         }
  721         tp = intotcpcb(inp);
  722         TCPDEBUG1();
  723         tcp_output_rcvd(tp);
  724 
  725 out:
  726         TCPDEBUG2(PRU_RCVD);
  727         INP_WUNLOCK(inp);
  728         return (error);
  729 }
  730 
  731 /*
  732  * Do a send by putting data in output queue and updating urgent
  733  * marker if URG set.  Possibly send more data.  Unlike the other
  734  * pru_*() routines, the mbuf chains are our responsibility.  We
  735  * must either enqueue them or free them.  The other pru_* routines
  736  * generally are caller-frees.
  737  */
  738 static int
  739 tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
  740     struct sockaddr *nam, struct mbuf *control, struct thread *td)
  741 {
  742         int error = 0;
  743         struct inpcb *inp;
  744         struct tcpcb *tp = NULL;
  745         int headlocked = 0;
  746 #ifdef INET6
  747         int isipv6;
  748 #endif
  749         TCPDEBUG0;
  750 
  751         /*
  752          * We require the pcbinfo lock in two cases:
  753          *
  754          * (1) An implied connect is taking place, which can result in
  755          *     binding IPs and ports and hence modification of the pcb hash
  756          *     chains.
  757          *
  758          * (2) PRUS_EOF is set, resulting in explicit close on the send.
  759          */
  760         if ((nam != NULL) || (flags & PRUS_EOF)) {
  761                 INP_INFO_WLOCK(&V_tcbinfo);
  762                 headlocked = 1;
  763         }
  764         inp = sotoinpcb(so);
  765         KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL"));
  766         INP_WLOCK(inp);
  767         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  768                 if (control)
  769                         m_freem(control);
  770                 if (m)
  771                         m_freem(m);
  772                 error = ECONNRESET;
  773                 goto out;
  774         }
  775 #ifdef INET6
  776         isipv6 = nam && nam->sa_family == AF_INET6;
  777 #endif /* INET6 */
  778         tp = intotcpcb(inp);
  779         TCPDEBUG1();
  780         if (control) {
  781                 /* TCP doesn't do control messages (rights, creds, etc) */
  782                 if (control->m_len) {
  783                         m_freem(control);
  784                         if (m)
  785                                 m_freem(m);
  786                         error = EINVAL;
  787                         goto out;
  788                 }
  789                 m_freem(control);       /* empty control, just free it */
  790         }
  791         if (!(flags & PRUS_OOB)) {
  792                 sbappendstream(&so->so_snd, m);
  793                 if (nam && tp->t_state < TCPS_SYN_SENT) {
  794                         /*
  795                          * Do implied connect if not yet connected,
  796                          * initialize window to default value, and
  797                          * initialize maxseg/maxopd using peer's cached
  798                          * MSS.
  799                          */
  800                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
  801 #ifdef INET6
  802                         if (isipv6)
  803                                 error = tcp6_connect(tp, nam, td);
  804                         else
  805 #endif /* INET6 */
  806                         error = tcp_connect(tp, nam, td);
  807                         if (error)
  808                                 goto out;
  809                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
  810                         tcp_mss(tp, -1);
  811                 }
  812                 if (flags & PRUS_EOF) {
  813                         /*
  814                          * Close the send side of the connection after
  815                          * the data is sent.
  816                          */
  817                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
  818                         socantsendmore(so);
  819                         tcp_usrclosed(tp);
  820                 }
  821                 if (headlocked) {
  822                         INP_INFO_WUNLOCK(&V_tcbinfo);
  823                         headlocked = 0;
  824                 }
  825                 if (!(inp->inp_flags & INP_DROPPED)) {
  826                         if (flags & PRUS_MORETOCOME)
  827                                 tp->t_flags |= TF_MORETOCOME;
  828                         error = tcp_output_send(tp);
  829                         if (flags & PRUS_MORETOCOME)
  830                                 tp->t_flags &= ~TF_MORETOCOME;
  831                 }
  832         } else {
  833                 /*
  834                  * XXXRW: PRUS_EOF not implemented with PRUS_OOB?
  835                  */
  836                 SOCKBUF_LOCK(&so->so_snd);
  837                 if (sbspace(&so->so_snd) < -512) {
  838                         SOCKBUF_UNLOCK(&so->so_snd);
  839                         m_freem(m);
  840                         error = ENOBUFS;
  841                         goto out;
  842                 }
  843                 /*
  844                  * According to RFC961 (Assigned Protocols),
  845                  * the urgent pointer points to the last octet
  846                  * of urgent data.  We continue, however,
  847                  * to consider it to indicate the first octet
  848                  * of data past the urgent section.
  849                  * Otherwise, snd_up should be one lower.
  850                  */
  851                 sbappendstream_locked(&so->so_snd, m);
  852                 SOCKBUF_UNLOCK(&so->so_snd);
  853                 if (nam && tp->t_state < TCPS_SYN_SENT) {
  854                         /*
  855                          * Do implied connect if not yet connected,
  856                          * initialize window to default value, and
  857                          * initialize maxseg/maxopd using peer's cached
  858                          * MSS.
  859                          */
  860                         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
  861 #ifdef INET6
  862                         if (isipv6)
  863                                 error = tcp6_connect(tp, nam, td);
  864                         else
  865 #endif /* INET6 */
  866                         error = tcp_connect(tp, nam, td);
  867                         if (error)
  868                                 goto out;
  869                         tp->snd_wnd = TTCP_CLIENT_SND_WND;
  870                         tcp_mss(tp, -1);
  871                         INP_INFO_WUNLOCK(&V_tcbinfo);
  872                         headlocked = 0;
  873                 } else if (nam) {
  874                         INP_INFO_WUNLOCK(&V_tcbinfo);
  875                         headlocked = 0;
  876                 }
  877                 tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
  878                 tp->t_flags |= TF_FORCEDATA;
  879                 error = tcp_output_send(tp);
  880                 tp->t_flags &= ~TF_FORCEDATA;
  881         }
  882 out:
  883         TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB :
  884                   ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
  885         INP_WUNLOCK(inp);
  886         if (headlocked)
  887                 INP_INFO_WUNLOCK(&V_tcbinfo);
  888         return (error);
  889 }
  890 
  891 /*
  892  * Abort the TCP.  Drop the connection abruptly.
  893  */
  894 static void
  895 tcp_usr_abort(struct socket *so)
  896 {
  897         struct inpcb *inp;
  898         struct tcpcb *tp = NULL;
  899         TCPDEBUG0;
  900 
  901         inp = sotoinpcb(so);
  902         KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL"));
  903 
  904         INP_INFO_WLOCK(&V_tcbinfo);
  905         INP_WLOCK(inp);
  906         KASSERT(inp->inp_socket != NULL,
  907             ("tcp_usr_abort: inp_socket == NULL"));
  908 
  909         /*
  910          * If we still have full TCP state, and we're not dropped, drop.
  911          */
  912         if (!(inp->inp_flags & INP_TIMEWAIT) &&
  913             !(inp->inp_flags & INP_DROPPED)) {
  914                 tp = intotcpcb(inp);
  915                 TCPDEBUG1();
  916                 tcp_drop(tp, ECONNABORTED);
  917                 TCPDEBUG2(PRU_ABORT);
  918         }
  919         if (!(inp->inp_flags & INP_DROPPED)) {
  920                 SOCK_LOCK(so);
  921                 so->so_state |= SS_PROTOREF;
  922                 SOCK_UNLOCK(so);
  923                 inp->inp_flags |= INP_SOCKREF;
  924         }
  925         INP_WUNLOCK(inp);
  926         INP_INFO_WUNLOCK(&V_tcbinfo);
  927 }
  928 
  929 /*
  930  * TCP socket is closed.  Start friendly disconnect.
  931  */
  932 static void
  933 tcp_usr_close(struct socket *so)
  934 {
  935         struct inpcb *inp;
  936         struct tcpcb *tp = NULL;
  937         TCPDEBUG0;
  938 
  939         inp = sotoinpcb(so);
  940         KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL"));
  941 
  942         INP_INFO_WLOCK(&V_tcbinfo);
  943         INP_WLOCK(inp);
  944         KASSERT(inp->inp_socket != NULL,
  945             ("tcp_usr_close: inp_socket == NULL"));
  946 
  947         /*
  948          * If we still have full TCP state, and we're not dropped, initiate
  949          * a disconnect.
  950          */
  951         if (!(inp->inp_flags & INP_TIMEWAIT) &&
  952             !(inp->inp_flags & INP_DROPPED)) {
  953                 tp = intotcpcb(inp);
  954                 TCPDEBUG1();
  955                 tcp_disconnect(tp);
  956                 TCPDEBUG2(PRU_CLOSE);
  957         }
  958         if (!(inp->inp_flags & INP_DROPPED)) {
  959                 SOCK_LOCK(so);
  960                 so->so_state |= SS_PROTOREF;
  961                 SOCK_UNLOCK(so);
  962                 inp->inp_flags |= INP_SOCKREF;
  963         }
  964         INP_WUNLOCK(inp);
  965         INP_INFO_WUNLOCK(&V_tcbinfo);
  966 }
  967 
  968 /*
  969  * Receive out-of-band data.
  970  */
  971 static int
  972 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
  973 {
  974         int error = 0;
  975         struct inpcb *inp;
  976         struct tcpcb *tp = NULL;
  977 
  978         TCPDEBUG0;
  979         inp = sotoinpcb(so);
  980         KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL"));
  981         INP_WLOCK(inp);
  982         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
  983                 error = ECONNRESET;
  984                 goto out;
  985         }
  986         tp = intotcpcb(inp);
  987         TCPDEBUG1();
  988         if ((so->so_oobmark == 0 &&
  989              (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
  990             so->so_options & SO_OOBINLINE ||
  991             tp->t_oobflags & TCPOOB_HADDATA) {
  992                 error = EINVAL;
  993                 goto out;
  994         }
  995         if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
  996                 error = EWOULDBLOCK;
  997                 goto out;
  998         }
  999         m->m_len = 1;
 1000         *mtod(m, caddr_t) = tp->t_iobc;
 1001         if ((flags & MSG_PEEK) == 0)
 1002                 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
 1003 
 1004 out:
 1005         TCPDEBUG2(PRU_RCVOOB);
 1006         INP_WUNLOCK(inp);
 1007         return (error);
 1008 }
 1009 
 1010 struct pr_usrreqs tcp_usrreqs = {
 1011         .pru_abort =            tcp_usr_abort,
 1012         .pru_accept =           tcp_usr_accept,
 1013         .pru_attach =           tcp_usr_attach,
 1014         .pru_bind =             tcp_usr_bind,
 1015         .pru_connect =          tcp_usr_connect,
 1016         .pru_control =          in_control,
 1017         .pru_detach =           tcp_usr_detach,
 1018         .pru_disconnect =       tcp_usr_disconnect,
 1019         .pru_listen =           tcp_usr_listen,
 1020         .pru_peeraddr =         in_getpeeraddr,
 1021         .pru_rcvd =             tcp_usr_rcvd,
 1022         .pru_rcvoob =           tcp_usr_rcvoob,
 1023         .pru_send =             tcp_usr_send,
 1024         .pru_shutdown =         tcp_usr_shutdown,
 1025         .pru_sockaddr =         in_getsockaddr,
 1026 #if 0
 1027         .pru_soreceive =        soreceive_stream,
 1028 #endif
 1029         .pru_sosetlabel =       in_pcbsosetlabel,
 1030         .pru_close =            tcp_usr_close,
 1031 };
 1032 
 1033 #ifdef INET6
 1034 struct pr_usrreqs tcp6_usrreqs = {
 1035         .pru_abort =            tcp_usr_abort,
 1036         .pru_accept =           tcp6_usr_accept,
 1037         .pru_attach =           tcp_usr_attach,
 1038         .pru_bind =             tcp6_usr_bind,
 1039         .pru_connect =          tcp6_usr_connect,
 1040         .pru_control =          in6_control,
 1041         .pru_detach =           tcp_usr_detach,
 1042         .pru_disconnect =       tcp_usr_disconnect,
 1043         .pru_listen =           tcp6_usr_listen,
 1044         .pru_peeraddr =         in6_mapped_peeraddr,
 1045         .pru_rcvd =             tcp_usr_rcvd,
 1046         .pru_rcvoob =           tcp_usr_rcvoob,
 1047         .pru_send =             tcp_usr_send,
 1048         .pru_shutdown =         tcp_usr_shutdown,
 1049         .pru_sockaddr =         in6_mapped_sockaddr,
 1050 #if 0
 1051         .pru_soreceive =        soreceive_stream,
 1052 #endif
 1053         .pru_sosetlabel =       in_pcbsosetlabel,
 1054         .pru_close =            tcp_usr_close,
 1055 };
 1056 #endif /* INET6 */
 1057 
 1058 /*
 1059  * Common subroutine to open a TCP connection to remote host specified
 1060  * by struct sockaddr_in in mbuf *nam.  Call in_pcbbind to assign a local
 1061  * port number if needed.  Call in_pcbconnect_setup to do the routing and
 1062  * to choose a local host address (interface).  If there is an existing
 1063  * incarnation of the same connection in TIME-WAIT state and if the remote
 1064  * host was sending CC options and if the connection duration was < MSL, then
 1065  * truncate the previous TIME-WAIT state and proceed.
 1066  * Initialize connection parameters and enter SYN-SENT state.
 1067  */
 1068 static int
 1069 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
 1070 {
 1071         struct inpcb *inp = tp->t_inpcb, *oinp;
 1072         struct socket *so = inp->inp_socket;
 1073         struct in_addr laddr;
 1074         u_short lport;
 1075         int error;
 1076 
 1077         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 1078         INP_WLOCK_ASSERT(inp);
 1079 
 1080         if (inp->inp_lport == 0) {
 1081                 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 1082                 if (error)
 1083                         return error;
 1084         }
 1085 
 1086         /*
 1087          * Cannot simply call in_pcbconnect, because there might be an
 1088          * earlier incarnation of this same connection still in
 1089          * TIME_WAIT state, creating an ADDRINUSE error.
 1090          */
 1091         laddr = inp->inp_laddr;
 1092         lport = inp->inp_lport;
 1093         error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
 1094             &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred);
 1095         if (error && oinp == NULL)
 1096                 return error;
 1097         if (oinp)
 1098                 return EADDRINUSE;
 1099         inp->inp_laddr = laddr;
 1100         in_pcbrehash(inp);
 1101 
 1102         /*
 1103          * Compute window scaling to request:
 1104          * Scale to fit into sweet spot.  See tcp_syncache.c.
 1105          * XXX: This should move to tcp_output().
 1106          */
 1107         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
 1108             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
 1109                 tp->request_r_scale++;
 1110 
 1111         soisconnecting(so);
 1112         TCPSTAT_INC(tcps_connattempt);
 1113         tp->t_state = TCPS_SYN_SENT;
 1114         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
 1115         tp->iss = tcp_new_isn(tp);
 1116         tp->t_bw_rtseq = tp->iss;
 1117         tcp_sendseqinit(tp);
 1118 
 1119         return 0;
 1120 }
 1121 
 1122 #ifdef INET6
 1123 static int
 1124 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td)
 1125 {
 1126         struct inpcb *inp = tp->t_inpcb, *oinp;
 1127         struct socket *so = inp->inp_socket;
 1128         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 1129         struct in6_addr addr6;
 1130         int error;
 1131 
 1132         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 1133         INP_WLOCK_ASSERT(inp);
 1134 
 1135         if (inp->inp_lport == 0) {
 1136                 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred);
 1137                 if (error)
 1138                         return error;
 1139         }
 1140 
 1141         /*
 1142          * Cannot simply call in_pcbconnect, because there might be an
 1143          * earlier incarnation of this same connection still in
 1144          * TIME_WAIT state, creating an ADDRINUSE error.
 1145          * in6_pcbladdr() also handles scope zone IDs.
 1146          */
 1147         error = in6_pcbladdr(inp, nam, &addr6);
 1148         if (error)
 1149                 return error;
 1150         oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
 1151                                   &sin6->sin6_addr, sin6->sin6_port,
 1152                                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 1153                                   ? &addr6
 1154                                   : &inp->in6p_laddr,
 1155                                   inp->inp_lport,  0, NULL);
 1156         if (oinp)
 1157                 return EADDRINUSE;
 1158         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 1159                 inp->in6p_laddr = addr6;
 1160         inp->in6p_faddr = sin6->sin6_addr;
 1161         inp->inp_fport = sin6->sin6_port;
 1162         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 1163         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 1164         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
 1165                 inp->inp_flow |=
 1166                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 1167         in_pcbrehash(inp);
 1168 
 1169         /* Compute window scaling to request.  */
 1170         while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
 1171             (TCP_MAXWIN << tp->request_r_scale) < sb_max)
 1172                 tp->request_r_scale++;
 1173 
 1174         soisconnecting(so);
 1175         TCPSTAT_INC(tcps_connattempt);
 1176         tp->t_state = TCPS_SYN_SENT;
 1177         tcp_timer_activate(tp, TT_KEEP, tcp_keepinit);
 1178         tp->iss = tcp_new_isn(tp);
 1179         tp->t_bw_rtseq = tp->iss;
 1180         tcp_sendseqinit(tp);
 1181 
 1182         return 0;
 1183 }
 1184 #endif /* INET6 */
 1185 
 1186 /*
 1187  * Export TCP internal state information via a struct tcp_info, based on the
 1188  * Linux 2.6 API.  Not ABI compatible as our constants are mapped differently
 1189  * (TCP state machine, etc).  We export all information using FreeBSD-native
 1190  * constants -- for example, the numeric values for tcpi_state will differ
 1191  * from Linux.
 1192  */
 1193 static void
 1194 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti)
 1195 {
 1196 
 1197         INP_WLOCK_ASSERT(tp->t_inpcb);
 1198         bzero(ti, sizeof(*ti));
 1199 
 1200         ti->tcpi_state = tp->t_state;
 1201         if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP))
 1202                 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS;
 1203         if (tp->t_flags & TF_SACK_PERMIT)
 1204                 ti->tcpi_options |= TCPI_OPT_SACK;
 1205         if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) {
 1206                 ti->tcpi_options |= TCPI_OPT_WSCALE;
 1207                 ti->tcpi_snd_wscale = tp->snd_scale;
 1208                 ti->tcpi_rcv_wscale = tp->rcv_scale;
 1209         }
 1210 
 1211         ti->tcpi_rto = tp->t_rxtcur * tick;
 1212         ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick;
 1213         ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;
 1214         ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT;
 1215 
 1216         ti->tcpi_snd_ssthresh = tp->snd_ssthresh;
 1217         ti->tcpi_snd_cwnd = tp->snd_cwnd;
 1218 
 1219         /*
 1220          * FreeBSD-specific extension fields for tcp_info.
 1221          */
 1222         ti->tcpi_rcv_space = tp->rcv_wnd;
 1223         ti->tcpi_rcv_nxt = tp->rcv_nxt;
 1224         ti->tcpi_snd_wnd = tp->snd_wnd;
 1225         ti->tcpi_snd_bwnd = tp->snd_bwnd;
 1226         ti->tcpi_snd_nxt = tp->snd_nxt;
 1227         ti->tcpi_snd_mss = tp->t_maxseg;
 1228         ti->tcpi_rcv_mss = tp->t_maxseg;
 1229         if (tp->t_flags & TF_TOE)
 1230                 ti->tcpi_options |= TCPI_OPT_TOE;
 1231         ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack;
 1232         ti->tcpi_rcv_ooopack = tp->t_rcvoopack;
 1233         ti->tcpi_snd_zerowin = tp->t_sndzerowin;
 1234 }
 1235 
 1236 /*
 1237  * tcp_ctloutput() must drop the inpcb lock before performing copyin on
 1238  * socket option arguments.  When it re-acquires the lock after the copy, it
 1239  * has to revalidate that the connection is still valid for the socket
 1240  * option.
 1241  */
 1242 #define INP_WLOCK_RECHECK(inp) do {                                     \
 1243         INP_WLOCK(inp);                                                 \
 1244         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {            \
 1245                 INP_WUNLOCK(inp);                                       \
 1246                 return (ECONNRESET);                                    \
 1247         }                                                               \
 1248         tp = intotcpcb(inp);                                            \
 1249 } while(0)
 1250 
 1251 int
 1252 tcp_ctloutput(struct socket *so, struct sockopt *sopt)
 1253 {
 1254         int     error, opt, optval;
 1255         struct  inpcb *inp;
 1256         struct  tcpcb *tp;
 1257         struct  tcp_info ti;
 1258         char buf[TCP_CA_NAME_MAX];
 1259         struct cc_algo *algo;
 1260 
 1261         error = 0;
 1262         inp = sotoinpcb(so);
 1263         KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL"));
 1264         INP_WLOCK(inp);
 1265         if (sopt->sopt_level != IPPROTO_TCP) {
 1266 #ifdef INET6
 1267                 if (inp->inp_vflag & INP_IPV6PROTO) {
 1268                         INP_WUNLOCK(inp);
 1269                         error = ip6_ctloutput(so, sopt);
 1270                 } else {
 1271 #endif /* INET6 */
 1272                         INP_WUNLOCK(inp);
 1273                         error = ip_ctloutput(so, sopt);
 1274 #ifdef INET6
 1275                 }
 1276 #endif
 1277                 return (error);
 1278         }
 1279         if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) {
 1280                 INP_WUNLOCK(inp);
 1281                 return (ECONNRESET);
 1282         }
 1283 
 1284         switch (sopt->sopt_dir) {
 1285         case SOPT_SET:
 1286                 switch (sopt->sopt_name) {
 1287 #ifdef TCP_SIGNATURE
 1288                 case TCP_MD5SIG:
 1289                         INP_WUNLOCK(inp);
 1290                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1291                             sizeof optval);
 1292                         if (error)
 1293                                 return (error);
 1294 
 1295                         INP_WLOCK_RECHECK(inp);
 1296                         if (optval > 0)
 1297                                 tp->t_flags |= TF_SIGNATURE;
 1298                         else
 1299                                 tp->t_flags &= ~TF_SIGNATURE;
 1300                         INP_WUNLOCK(inp);
 1301                         break;
 1302 #endif /* TCP_SIGNATURE */
 1303                 case TCP_NODELAY:
 1304                 case TCP_NOOPT:
 1305                         INP_WUNLOCK(inp);
 1306                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1307                             sizeof optval);
 1308                         if (error)
 1309                                 return (error);
 1310 
 1311                         INP_WLOCK_RECHECK(inp);
 1312                         switch (sopt->sopt_name) {
 1313                         case TCP_NODELAY:
 1314                                 opt = TF_NODELAY;
 1315                                 break;
 1316                         case TCP_NOOPT:
 1317                                 opt = TF_NOOPT;
 1318                                 break;
 1319                         default:
 1320                                 opt = 0; /* dead code to fool gcc */
 1321                                 break;
 1322                         }
 1323 
 1324                         if (optval)
 1325                                 tp->t_flags |= opt;
 1326                         else
 1327                                 tp->t_flags &= ~opt;
 1328                         INP_WUNLOCK(inp);
 1329                         break;
 1330 
 1331                 case TCP_NOPUSH:
 1332                         INP_WUNLOCK(inp);
 1333                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1334                             sizeof optval);
 1335                         if (error)
 1336                                 return (error);
 1337 
 1338                         INP_WLOCK_RECHECK(inp);
 1339                         if (optval)
 1340                                 tp->t_flags |= TF_NOPUSH;
 1341                         else if (tp->t_flags & TF_NOPUSH) {
 1342                                 tp->t_flags &= ~TF_NOPUSH;
 1343                                 if (TCPS_HAVEESTABLISHED(tp->t_state))
 1344                                         error = tcp_output(tp);
 1345                         }
 1346                         INP_WUNLOCK(inp);
 1347                         break;
 1348 
 1349                 case TCP_MAXSEG:
 1350                         INP_WUNLOCK(inp);
 1351                         error = sooptcopyin(sopt, &optval, sizeof optval,
 1352                             sizeof optval);
 1353                         if (error)
 1354                                 return (error);
 1355 
 1356                         INP_WLOCK_RECHECK(inp);
 1357                         if (optval > 0 && optval <= tp->t_maxseg &&
 1358                             optval + 40 >= V_tcp_minmss)
 1359                                 tp->t_maxseg = optval;
 1360                         else
 1361                                 error = EINVAL;
 1362                         INP_WUNLOCK(inp);
 1363                         break;
 1364 
 1365                 case TCP_INFO:
 1366                         INP_WUNLOCK(inp);
 1367                         error = EINVAL;
 1368                         break;
 1369 
 1370                 case TCP_CONGESTION:
 1371                         INP_WUNLOCK(inp);
 1372                         bzero(buf, sizeof(buf));
 1373                         error = sooptcopyin(sopt, &buf, sizeof(buf), 1);
 1374                         if (error)
 1375                                 break;
 1376                         INP_WLOCK_RECHECK(inp);
 1377                         /*
 1378                          * Return EINVAL if we can't find the requested cc algo.
 1379                          */
 1380                         error = EINVAL;
 1381                         CC_LIST_RLOCK();
 1382                         STAILQ_FOREACH(algo, &cc_list, entries) {
 1383                                 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX)
 1384                                     == 0) {
 1385                                         /* We've found the requested algo. */
 1386                                         error = 0;
 1387                                         /*
 1388                                          * We hold a write lock over the tcb
 1389                                          * so it's safe to do these things
 1390                                          * without ordering concerns.
 1391                                          */
 1392                                         if (CC_ALGO(tp)->cb_destroy != NULL)
 1393                                                 CC_ALGO(tp)->cb_destroy(tp->ccv);
 1394                                         CC_ALGO(tp) = algo;
 1395                                         /*
 1396                                          * If something goes pear shaped
 1397                                          * initialising the new algo,
 1398                                          * fall back to newreno (which
 1399                                          * does not require initialisation).
 1400                                          */
 1401                                         if (algo->cb_init != NULL)
 1402                                                 if (algo->cb_init(tp->ccv) > 0) {
 1403                                                         CC_ALGO(tp) = &newreno_cc_algo;
 1404                                                         /*
 1405                                                          * The only reason init
 1406                                                          * should fail is
 1407                                                          * because of malloc.
 1408                                                          */
 1409                                                         error = ENOMEM;
 1410                                                 }
 1411                                         break; /* Break the STAILQ_FOREACH. */
 1412                                 }
 1413                         }
 1414                         CC_LIST_RUNLOCK();
 1415                         INP_WUNLOCK(inp);
 1416                         break;
 1417 
 1418                 default:
 1419                         INP_WUNLOCK(inp);
 1420                         error = ENOPROTOOPT;
 1421                         break;
 1422                 }
 1423                 break;
 1424 
 1425         case SOPT_GET:
 1426                 tp = intotcpcb(inp);
 1427                 switch (sopt->sopt_name) {
 1428 #ifdef TCP_SIGNATURE
 1429                 case TCP_MD5SIG:
 1430                         optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
 1431                         INP_WUNLOCK(inp);
 1432                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1433                         break;
 1434 #endif
 1435 
 1436                 case TCP_NODELAY:
 1437                         optval = tp->t_flags & TF_NODELAY;
 1438                         INP_WUNLOCK(inp);
 1439                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1440                         break;
 1441                 case TCP_MAXSEG:
 1442                         optval = tp->t_maxseg;
 1443                         INP_WUNLOCK(inp);
 1444                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1445                         break;
 1446                 case TCP_NOOPT:
 1447                         optval = tp->t_flags & TF_NOOPT;
 1448                         INP_WUNLOCK(inp);
 1449                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1450                         break;
 1451                 case TCP_NOPUSH:
 1452                         optval = tp->t_flags & TF_NOPUSH;
 1453                         INP_WUNLOCK(inp);
 1454                         error = sooptcopyout(sopt, &optval, sizeof optval);
 1455                         break;
 1456                 case TCP_INFO:
 1457                         tcp_fill_info(tp, &ti);
 1458                         INP_WUNLOCK(inp);
 1459                         error = sooptcopyout(sopt, &ti, sizeof ti);
 1460                         break;
 1461                 case TCP_CONGESTION:
 1462                         bzero(buf, sizeof(buf));
 1463                         strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX);
 1464                         INP_WUNLOCK(inp);
 1465                         error = sooptcopyout(sopt, buf, TCP_CA_NAME_MAX);
 1466                         break;
 1467                 default:
 1468                         INP_WUNLOCK(inp);
 1469                         error = ENOPROTOOPT;
 1470                         break;
 1471                 }
 1472                 break;
 1473         }
 1474         return (error);
 1475 }
 1476 #undef INP_WLOCK_RECHECK
 1477 
 1478 /*
 1479  * tcp_sendspace and tcp_recvspace are the default send and receive window
 1480  * sizes, respectively.  These are obsolescent (this information should
 1481  * be set by the route).
 1482  */
 1483 u_long  tcp_sendspace = 1024*32;
 1484 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
 1485     &tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
 1486 u_long  tcp_recvspace = 1024*64;
 1487 SYSCTL_ULONG(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
 1488     &tcp_recvspace , 0, "Maximum incoming TCP datagram size");
 1489 
 1490 /*
 1491  * Attach TCP protocol to socket, allocating
 1492  * internet protocol control block, tcp control block,
 1493  * bufer space, and entering LISTEN state if to accept connections.
 1494  */
 1495 static int
 1496 tcp_attach(struct socket *so)
 1497 {
 1498         struct tcpcb *tp;
 1499         struct inpcb *inp;
 1500         int error;
 1501 
 1502         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
 1503                 error = soreserve(so, tcp_sendspace, tcp_recvspace);
 1504                 if (error)
 1505                         return (error);
 1506         }
 1507         so->so_rcv.sb_flags |= SB_AUTOSIZE;
 1508         so->so_snd.sb_flags |= SB_AUTOSIZE;
 1509         INP_INFO_WLOCK(&V_tcbinfo);
 1510         error = in_pcballoc(so, &V_tcbinfo);
 1511         if (error) {
 1512                 INP_INFO_WUNLOCK(&V_tcbinfo);
 1513                 return (error);
 1514         }
 1515         inp = sotoinpcb(so);
 1516 #ifdef INET6
 1517         if (inp->inp_vflag & INP_IPV6PROTO) {
 1518                 inp->inp_vflag |= INP_IPV6;
 1519                 inp->in6p_hops = -1;    /* use kernel default */
 1520         }
 1521         else
 1522 #endif
 1523         inp->inp_vflag |= INP_IPV4;
 1524         tp = tcp_newtcpcb(inp);
 1525         if (tp == NULL) {
 1526                 in_pcbdetach(inp);
 1527                 in_pcbfree(inp);
 1528                 INP_INFO_WUNLOCK(&V_tcbinfo);
 1529                 return (ENOBUFS);
 1530         }
 1531         tp->t_state = TCPS_CLOSED;
 1532         INP_WUNLOCK(inp);
 1533         INP_INFO_WUNLOCK(&V_tcbinfo);
 1534         return (0);
 1535 }
 1536 
 1537 /*
 1538  * Initiate (or continue) disconnect.
 1539  * If embryonic state, just send reset (once).
 1540  * If in ``let data drain'' option and linger null, just drop.
 1541  * Otherwise (hard), mark socket disconnecting and drop
 1542  * current input data; switch states based on user close, and
 1543  * send segment to peer (with FIN).
 1544  */
 1545 static void
 1546 tcp_disconnect(struct tcpcb *tp)
 1547 {
 1548         struct inpcb *inp = tp->t_inpcb;
 1549         struct socket *so = inp->inp_socket;
 1550 
 1551         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 1552         INP_WLOCK_ASSERT(inp);
 1553 
 1554         /*
 1555          * Neither tcp_close() nor tcp_drop() should return NULL, as the
 1556          * socket is still open.
 1557          */
 1558         if (tp->t_state < TCPS_ESTABLISHED) {
 1559                 tp = tcp_close(tp);
 1560                 KASSERT(tp != NULL,
 1561                     ("tcp_disconnect: tcp_close() returned NULL"));
 1562         } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) {
 1563                 tp = tcp_drop(tp, 0);
 1564                 KASSERT(tp != NULL,
 1565                     ("tcp_disconnect: tcp_drop() returned NULL"));
 1566         } else {
 1567                 soisdisconnecting(so);
 1568                 sbflush(&so->so_rcv);
 1569                 tcp_usrclosed(tp);
 1570                 if (!(inp->inp_flags & INP_DROPPED))
 1571                         tcp_output_disconnect(tp);
 1572         }
 1573 }
 1574 
 1575 /*
 1576  * User issued close, and wish to trail through shutdown states:
 1577  * if never received SYN, just forget it.  If got a SYN from peer,
 1578  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
 1579  * If already got a FIN from peer, then almost done; go to LAST_ACK
 1580  * state.  In all other cases, have already sent FIN to peer (e.g.
 1581  * after PRU_SHUTDOWN), and just have to play tedious game waiting
 1582  * for peer to send FIN or not respond to keep-alives, etc.
 1583  * We can let the user exit from the close as soon as the FIN is acked.
 1584  */
 1585 static void
 1586 tcp_usrclosed(struct tcpcb *tp)
 1587 {
 1588 
 1589         INP_INFO_WLOCK_ASSERT(&V_tcbinfo);
 1590         INP_WLOCK_ASSERT(tp->t_inpcb);
 1591 
 1592         switch (tp->t_state) {
 1593         case TCPS_LISTEN:
 1594                 tcp_offload_listen_close(tp);
 1595                 /* FALLTHROUGH */
 1596         case TCPS_CLOSED:
 1597                 tp->t_state = TCPS_CLOSED;
 1598                 tp = tcp_close(tp);
 1599                 /*
 1600                  * tcp_close() should never return NULL here as the socket is
 1601                  * still open.
 1602                  */
 1603                 KASSERT(tp != NULL,
 1604                     ("tcp_usrclosed: tcp_close() returned NULL"));
 1605                 break;
 1606 
 1607         case TCPS_SYN_SENT:
 1608         case TCPS_SYN_RECEIVED:
 1609                 tp->t_flags |= TF_NEEDFIN;
 1610                 break;
 1611 
 1612         case TCPS_ESTABLISHED:
 1613                 tp->t_state = TCPS_FIN_WAIT_1;
 1614                 break;
 1615 
 1616         case TCPS_CLOSE_WAIT:
 1617                 tp->t_state = TCPS_LAST_ACK;
 1618                 break;
 1619         }
 1620         if (tp->t_state >= TCPS_FIN_WAIT_2) {
 1621                 soisdisconnected(tp->t_inpcb->inp_socket);
 1622                 /* Prevent the connection hanging in FIN_WAIT_2 forever. */
 1623                 if (tp->t_state == TCPS_FIN_WAIT_2) {
 1624                         int timeout;
 1625 
 1626                         timeout = (tcp_fast_finwait2_recycle) ? 
 1627                             tcp_finwait2_timeout : tcp_maxidle;
 1628                         tcp_timer_activate(tp, TT_2MSL, timeout);
 1629                 }
 1630         }
 1631 }
 1632 
 1633 #ifdef DDB
 1634 static void
 1635 db_print_indent(int indent)
 1636 {
 1637         int i;
 1638 
 1639         for (i = 0; i < indent; i++)
 1640                 db_printf(" ");
 1641 }
 1642 
 1643 static void
 1644 db_print_tstate(int t_state)
 1645 {
 1646 
 1647         switch (t_state) {
 1648         case TCPS_CLOSED:
 1649                 db_printf("TCPS_CLOSED");
 1650                 return;
 1651 
 1652         case TCPS_LISTEN:
 1653                 db_printf("TCPS_LISTEN");
 1654                 return;
 1655 
 1656         case TCPS_SYN_SENT:
 1657                 db_printf("TCPS_SYN_SENT");
 1658                 return;
 1659 
 1660         case TCPS_SYN_RECEIVED:
 1661                 db_printf("TCPS_SYN_RECEIVED");
 1662                 return;
 1663 
 1664         case TCPS_ESTABLISHED:
 1665                 db_printf("TCPS_ESTABLISHED");
 1666                 return;
 1667 
 1668         case TCPS_CLOSE_WAIT:
 1669                 db_printf("TCPS_CLOSE_WAIT");
 1670                 return;
 1671 
 1672         case TCPS_FIN_WAIT_1:
 1673                 db_printf("TCPS_FIN_WAIT_1");
 1674                 return;
 1675 
 1676         case TCPS_CLOSING:
 1677                 db_printf("TCPS_CLOSING");
 1678                 return;
 1679 
 1680         case TCPS_LAST_ACK:
 1681                 db_printf("TCPS_LAST_ACK");
 1682                 return;
 1683 
 1684         case TCPS_FIN_WAIT_2:
 1685                 db_printf("TCPS_FIN_WAIT_2");
 1686                 return;
 1687 
 1688         case TCPS_TIME_WAIT:
 1689                 db_printf("TCPS_TIME_WAIT");
 1690                 return;
 1691 
 1692         default:
 1693                 db_printf("unknown");
 1694                 return;
 1695         }
 1696 }
 1697 
 1698 static void
 1699 db_print_tflags(u_int t_flags)
 1700 {
 1701         int comma;
 1702 
 1703         comma = 0;
 1704         if (t_flags & TF_ACKNOW) {
 1705                 db_printf("%sTF_ACKNOW", comma ? ", " : "");
 1706                 comma = 1;
 1707         }
 1708         if (t_flags & TF_DELACK) {
 1709                 db_printf("%sTF_DELACK", comma ? ", " : "");
 1710                 comma = 1;
 1711         }
 1712         if (t_flags & TF_NODELAY) {
 1713                 db_printf("%sTF_NODELAY", comma ? ", " : "");
 1714                 comma = 1;
 1715         }
 1716         if (t_flags & TF_NOOPT) {
 1717                 db_printf("%sTF_NOOPT", comma ? ", " : "");
 1718                 comma = 1;
 1719         }
 1720         if (t_flags & TF_SENTFIN) {
 1721                 db_printf("%sTF_SENTFIN", comma ? ", " : "");
 1722                 comma = 1;
 1723         }
 1724         if (t_flags & TF_REQ_SCALE) {
 1725                 db_printf("%sTF_REQ_SCALE", comma ? ", " : "");
 1726                 comma = 1;
 1727         }
 1728         if (t_flags & TF_RCVD_SCALE) {
 1729                 db_printf("%sTF_RECVD_SCALE", comma ? ", " : "");
 1730                 comma = 1;
 1731         }
 1732         if (t_flags & TF_REQ_TSTMP) {
 1733                 db_printf("%sTF_REQ_TSTMP", comma ? ", " : "");
 1734                 comma = 1;
 1735         }
 1736         if (t_flags & TF_RCVD_TSTMP) {
 1737                 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : "");
 1738                 comma = 1;
 1739         }
 1740         if (t_flags & TF_SACK_PERMIT) {
 1741                 db_printf("%sTF_SACK_PERMIT", comma ? ", " : "");
 1742                 comma = 1;
 1743         }
 1744         if (t_flags & TF_NEEDSYN) {
 1745                 db_printf("%sTF_NEEDSYN", comma ? ", " : "");
 1746                 comma = 1;
 1747         }
 1748         if (t_flags & TF_NEEDFIN) {
 1749                 db_printf("%sTF_NEEDFIN", comma ? ", " : "");
 1750                 comma = 1;
 1751         }
 1752         if (t_flags & TF_NOPUSH) {
 1753                 db_printf("%sTF_NOPUSH", comma ? ", " : "");
 1754                 comma = 1;
 1755         }
 1756         if (t_flags & TF_MORETOCOME) {
 1757                 db_printf("%sTF_MORETOCOME", comma ? ", " : "");
 1758                 comma = 1;
 1759         }
 1760         if (t_flags & TF_LQ_OVERFLOW) {
 1761                 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : "");
 1762                 comma = 1;
 1763         }
 1764         if (t_flags & TF_LASTIDLE) {
 1765                 db_printf("%sTF_LASTIDLE", comma ? ", " : "");
 1766                 comma = 1;
 1767         }
 1768         if (t_flags & TF_RXWIN0SENT) {
 1769                 db_printf("%sTF_RXWIN0SENT", comma ? ", " : "");
 1770                 comma = 1;
 1771         }
 1772         if (t_flags & TF_FASTRECOVERY) {
 1773                 db_printf("%sTF_FASTRECOVERY", comma ? ", " : "");
 1774                 comma = 1;
 1775         }
 1776         if (t_flags & TF_CONGRECOVERY) {
 1777                 db_printf("%sTF_CONGRECOVERY", comma ? ", " : "");
 1778                 comma = 1;
 1779         }
 1780         if (t_flags & TF_WASFRECOVERY) {
 1781                 db_printf("%sTF_WASFRECOVERY", comma ? ", " : "");
 1782                 comma = 1;
 1783         }
 1784         if (t_flags & TF_SIGNATURE) {
 1785                 db_printf("%sTF_SIGNATURE", comma ? ", " : "");
 1786                 comma = 1;
 1787         }
 1788         if (t_flags & TF_FORCEDATA) {
 1789                 db_printf("%sTF_FORCEDATA", comma ? ", " : "");
 1790                 comma = 1;
 1791         }
 1792         if (t_flags & TF_TSO) {
 1793                 db_printf("%sTF_TSO", comma ? ", " : "");
 1794                 comma = 1;
 1795         }
 1796         if (t_flags & TF_ECN_PERMIT) {
 1797                 db_printf("%sTF_ECN_PERMIT", comma ? ", " : "");
 1798                 comma = 1;
 1799         }
 1800 }
 1801 
 1802 static void
 1803 db_print_toobflags(char t_oobflags)
 1804 {
 1805         int comma;
 1806 
 1807         comma = 0;
 1808         if (t_oobflags & TCPOOB_HAVEDATA) {
 1809                 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : "");
 1810                 comma = 1;
 1811         }
 1812         if (t_oobflags & TCPOOB_HADDATA) {
 1813                 db_printf("%sTCPOOB_HADDATA", comma ? ", " : "");
 1814                 comma = 1;
 1815         }
 1816 }
 1817 
 1818 static void
 1819 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent)
 1820 {
 1821 
 1822         db_print_indent(indent);
 1823         db_printf("%s at %p\n", name, tp);
 1824 
 1825         indent += 2;
 1826 
 1827         db_print_indent(indent);
 1828         db_printf("t_segq first: %p   t_segqlen: %d   t_dupacks: %d\n",
 1829            LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks);
 1830 
 1831         db_print_indent(indent);
 1832         db_printf("tt_rexmt: %p   tt_persist: %p   tt_keep: %p\n",
 1833             &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep);
 1834 
 1835         db_print_indent(indent);
 1836         db_printf("tt_2msl: %p   tt_delack: %p   t_inpcb: %p\n", &tp->t_timers->tt_2msl,
 1837             &tp->t_timers->tt_delack, tp->t_inpcb);
 1838 
 1839         db_print_indent(indent);
 1840         db_printf("t_state: %d (", tp->t_state);
 1841         db_print_tstate(tp->t_state);
 1842         db_printf(")\n");
 1843 
 1844         db_print_indent(indent);
 1845         db_printf("t_flags: 0x%x (", tp->t_flags);
 1846         db_print_tflags(tp->t_flags);
 1847         db_printf(")\n");
 1848 
 1849         db_print_indent(indent);
 1850         db_printf("snd_una: 0x%08x   snd_max: 0x%08x   snd_nxt: x0%08x\n",
 1851             tp->snd_una, tp->snd_max, tp->snd_nxt);
 1852 
 1853         db_print_indent(indent);
 1854         db_printf("snd_up: 0x%08x   snd_wl1: 0x%08x   snd_wl2: 0x%08x\n",
 1855            tp->snd_up, tp->snd_wl1, tp->snd_wl2);
 1856 
 1857         db_print_indent(indent);
 1858         db_printf("iss: 0x%08x   irs: 0x%08x   rcv_nxt: 0x%08x\n",
 1859             tp->iss, tp->irs, tp->rcv_nxt);
 1860 
 1861         db_print_indent(indent);
 1862         db_printf("rcv_adv: 0x%08x   rcv_wnd: %lu   rcv_up: 0x%08x\n",
 1863             tp->rcv_adv, tp->rcv_wnd, tp->rcv_up);
 1864 
 1865         db_print_indent(indent);
 1866         db_printf("snd_wnd: %lu   snd_cwnd: %lu   snd_bwnd: %lu\n",
 1867            tp->snd_wnd, tp->snd_cwnd, tp->snd_bwnd);
 1868 
 1869         db_print_indent(indent);
 1870         db_printf("snd_ssthresh: %lu   snd_bandwidth: %lu   snd_recover: "
 1871             "0x%08x\n", tp->snd_ssthresh, tp->snd_bandwidth,
 1872             tp->snd_recover);
 1873 
 1874         db_print_indent(indent);
 1875         db_printf("t_maxopd: %u   t_rcvtime: %u   t_startime: %u\n",
 1876             tp->t_maxopd, tp->t_rcvtime, tp->t_starttime);
 1877 
 1878         db_print_indent(indent);
 1879         db_printf("t_rttime: %u   t_rtsq: 0x%08x   t_bw_rtttime: %u\n",
 1880             tp->t_rtttime, tp->t_rtseq, tp->t_bw_rtttime);
 1881 
 1882         db_print_indent(indent);
 1883         db_printf("t_bw_rtseq: 0x%08x   t_rxtcur: %d   t_maxseg: %u   "
 1884             "t_srtt: %d\n", tp->t_bw_rtseq, tp->t_rxtcur, tp->t_maxseg,
 1885             tp->t_srtt);
 1886 
 1887         db_print_indent(indent);
 1888         db_printf("t_rttvar: %d   t_rxtshift: %d   t_rttmin: %u   "
 1889             "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin,
 1890             tp->t_rttbest);
 1891 
 1892         db_print_indent(indent);
 1893         db_printf("t_rttupdated: %lu   max_sndwnd: %lu   t_softerror: %d\n",
 1894             tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror);
 1895 
 1896         db_print_indent(indent);
 1897         db_printf("t_oobflags: 0x%x (", tp->t_oobflags);
 1898         db_print_toobflags(tp->t_oobflags);
 1899         db_printf(")   t_iobc: 0x%02x\n", tp->t_iobc);
 1900 
 1901         db_print_indent(indent);
 1902         db_printf("snd_scale: %u   rcv_scale: %u   request_r_scale: %u\n",
 1903             tp->snd_scale, tp->rcv_scale, tp->request_r_scale);
 1904 
 1905         db_print_indent(indent);
 1906         db_printf("ts_recent: %u   ts_recent_age: %u\n",
 1907             tp->ts_recent, tp->ts_recent_age);
 1908 
 1909         db_print_indent(indent);
 1910         db_printf("ts_offset: %u   last_ack_sent: 0x%08x   snd_cwnd_prev: "
 1911             "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev);
 1912 
 1913         db_print_indent(indent);
 1914         db_printf("snd_ssthresh_prev: %lu   snd_recover_prev: 0x%08x   "
 1915             "t_badrxtwin: %u\n", tp->snd_ssthresh_prev,
 1916             tp->snd_recover_prev, tp->t_badrxtwin);
 1917 
 1918         db_print_indent(indent);
 1919         db_printf("snd_numholes: %d  snd_holes first: %p\n",
 1920             tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes));
 1921 
 1922         db_print_indent(indent);
 1923         db_printf("snd_fack: 0x%08x   rcv_numsacks: %d   sack_newdata: "
 1924             "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata);
 1925 
 1926         /* Skip sackblks, sackhint. */
 1927 
 1928         db_print_indent(indent);
 1929         db_printf("t_rttlow: %d   rfbuf_ts: %u   rfbuf_cnt: %d\n",
 1930             tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt);
 1931 }
 1932 
 1933 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb)
 1934 {
 1935         struct tcpcb *tp;
 1936 
 1937         if (!have_addr) {
 1938                 db_printf("usage: show tcpcb <addr>\n");
 1939                 return;
 1940         }
 1941         tp = (struct tcpcb *)addr;
 1942 
 1943         db_print_tcpcb(tp, "tcpcb", 0);
 1944 }
 1945 #endif

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