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tcp_usrreq.c revision 1.81.2.6
      1  1.81.2.6     skrll /*	$NetBSD: tcp_usrreq.c,v 1.81.2.6 2005/02/04 11:47:49 skrll Exp $	*/
      2      1.40    itojun 
      3      1.40    itojun /*
      4      1.40    itojun  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      5      1.40    itojun  * All rights reserved.
      6      1.71    itojun  *
      7      1.40    itojun  * Redistribution and use in source and binary forms, with or without
      8      1.40    itojun  * modification, are permitted provided that the following conditions
      9      1.40    itojun  * are met:
     10      1.40    itojun  * 1. Redistributions of source code must retain the above copyright
     11      1.40    itojun  *    notice, this list of conditions and the following disclaimer.
     12      1.40    itojun  * 2. Redistributions in binary form must reproduce the above copyright
     13      1.40    itojun  *    notice, this list of conditions and the following disclaimer in the
     14      1.40    itojun  *    documentation and/or other materials provided with the distribution.
     15      1.40    itojun  * 3. Neither the name of the project nor the names of its contributors
     16      1.40    itojun  *    may be used to endorse or promote products derived from this software
     17      1.40    itojun  *    without specific prior written permission.
     18      1.71    itojun  *
     19      1.40    itojun  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     20      1.40    itojun  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21      1.40    itojun  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22      1.40    itojun  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     23      1.40    itojun  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24      1.40    itojun  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25      1.40    itojun  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26      1.40    itojun  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27      1.40    itojun  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28      1.40    itojun  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29      1.40    itojun  * SUCH DAMAGE.
     30      1.40    itojun  */
     31      1.34   thorpej 
     32      1.34   thorpej /*-
     33      1.34   thorpej  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
     34      1.34   thorpej  * All rights reserved.
     35      1.34   thorpej  *
     36      1.34   thorpej  * This code is derived from software contributed to The NetBSD Foundation
     37      1.34   thorpej  * by Jason R. Thorpe and Kevin M. Lahey of the Numerical Aerospace Simulation
     38      1.34   thorpej  * Facility, NASA Ames Research Center.
     39      1.34   thorpej  *
     40      1.34   thorpej  * Redistribution and use in source and binary forms, with or without
     41      1.34   thorpej  * modification, are permitted provided that the following conditions
     42      1.34   thorpej  * are met:
     43      1.34   thorpej  * 1. Redistributions of source code must retain the above copyright
     44      1.34   thorpej  *    notice, this list of conditions and the following disclaimer.
     45      1.34   thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     46      1.34   thorpej  *    notice, this list of conditions and the following disclaimer in the
     47      1.34   thorpej  *    documentation and/or other materials provided with the distribution.
     48      1.34   thorpej  * 3. All advertising materials mentioning features or use of this software
     49      1.34   thorpej  *    must display the following acknowledgement:
     50      1.34   thorpej  *	This product includes software developed by the NetBSD
     51      1.34   thorpej  *	Foundation, Inc. and its contributors.
     52      1.34   thorpej  * 4. Neither the name of The NetBSD Foundation nor the names of its
     53      1.34   thorpej  *    contributors may be used to endorse or promote products derived
     54      1.34   thorpej  *    from this software without specific prior written permission.
     55      1.34   thorpej  *
     56      1.34   thorpej  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     57      1.34   thorpej  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     58      1.34   thorpej  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     59      1.34   thorpej  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     60      1.34   thorpej  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     61      1.34   thorpej  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     62      1.34   thorpej  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     63      1.34   thorpej  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     64      1.34   thorpej  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     65      1.34   thorpej  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     66      1.34   thorpej  * POSSIBILITY OF SUCH DAMAGE.
     67      1.34   thorpej  */
     68      1.10       cgd 
     69       1.1       cgd /*
     70      1.33   thorpej  * Copyright (c) 1982, 1986, 1988, 1993, 1995
     71       1.9   mycroft  *	The Regents of the University of California.  All rights reserved.
     72       1.1       cgd  *
     73       1.1       cgd  * Redistribution and use in source and binary forms, with or without
     74       1.1       cgd  * modification, are permitted provided that the following conditions
     75       1.1       cgd  * are met:
     76       1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     77       1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     78       1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     79       1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     80       1.1       cgd  *    documentation and/or other materials provided with the distribution.
     81  1.81.2.2     skrll  * 3. Neither the name of the University nor the names of its contributors
     82       1.1       cgd  *    may be used to endorse or promote products derived from this software
     83       1.1       cgd  *    without specific prior written permission.
     84       1.1       cgd  *
     85       1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     86       1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     87       1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     88       1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     89       1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     90       1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     91       1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     92       1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     93       1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     94       1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     95       1.1       cgd  * SUCH DAMAGE.
     96       1.1       cgd  *
     97      1.33   thorpej  *	@(#)tcp_usrreq.c	8.5 (Berkeley) 6/21/95
     98       1.1       cgd  */
     99      1.67     lukem 
    100      1.67     lukem #include <sys/cdefs.h>
    101  1.81.2.6     skrll __KERNEL_RCSID(0, "$NetBSD: tcp_usrreq.c,v 1.81.2.6 2005/02/04 11:47:49 skrll Exp $");
    102       1.1       cgd 
    103      1.40    itojun #include "opt_inet.h"
    104      1.42   thorpej #include "opt_ipsec.h"
    105      1.63       abs #include "opt_tcp_debug.h"
    106      1.77    martin #include "opt_mbuftrace.h"
    107      1.40    itojun 
    108       1.5   mycroft #include <sys/param.h>
    109       1.5   mycroft #include <sys/systm.h>
    110      1.13     glass #include <sys/kernel.h>
    111       1.5   mycroft #include <sys/malloc.h>
    112       1.5   mycroft #include <sys/mbuf.h>
    113       1.5   mycroft #include <sys/socket.h>
    114       1.5   mycroft #include <sys/socketvar.h>
    115       1.5   mycroft #include <sys/protosw.h>
    116       1.5   mycroft #include <sys/errno.h>
    117       1.5   mycroft #include <sys/stat.h>
    118      1.20  christos #include <sys/proc.h>
    119      1.40    itojun #include <sys/domain.h>
    120      1.20  christos #include <sys/sysctl.h>
    121       1.1       cgd 
    122       1.5   mycroft #include <net/if.h>
    123       1.5   mycroft #include <net/route.h>
    124       1.1       cgd 
    125       1.5   mycroft #include <netinet/in.h>
    126       1.5   mycroft #include <netinet/in_systm.h>
    127      1.14       cgd #include <netinet/in_var.h>
    128       1.5   mycroft #include <netinet/ip.h>
    129       1.5   mycroft #include <netinet/in_pcb.h>
    130       1.5   mycroft #include <netinet/ip_var.h>
    131      1.40    itojun 
    132      1.40    itojun #ifdef INET6
    133      1.40    itojun #ifndef INET
    134      1.40    itojun #include <netinet/in.h>
    135      1.40    itojun #endif
    136      1.40    itojun #include <netinet/ip6.h>
    137      1.40    itojun #include <netinet6/in6_pcb.h>
    138      1.40    itojun #include <netinet6/ip6_var.h>
    139      1.40    itojun #endif
    140      1.40    itojun 
    141       1.5   mycroft #include <netinet/tcp.h>
    142       1.5   mycroft #include <netinet/tcp_fsm.h>
    143       1.5   mycroft #include <netinet/tcp_seq.h>
    144       1.5   mycroft #include <netinet/tcp_timer.h>
    145       1.5   mycroft #include <netinet/tcp_var.h>
    146       1.5   mycroft #include <netinet/tcpip.h>
    147       1.5   mycroft #include <netinet/tcp_debug.h>
    148      1.26   thorpej 
    149      1.68     lukem #include "opt_tcp_space.h"
    150       1.1       cgd 
    151      1.40    itojun #ifdef IPSEC
    152      1.40    itojun #include <netinet6/ipsec.h>
    153      1.40    itojun #endif /*IPSEC*/
    154      1.40    itojun 
    155       1.1       cgd /*
    156       1.1       cgd  * TCP protocol interface to socket abstraction.
    157       1.1       cgd  */
    158      1.76  christos 
    159       1.1       cgd /*
    160       1.1       cgd  * Process a TCP user request for TCP tb.  If this is a send request
    161       1.1       cgd  * then m is the mbuf chain of send data.  If this is a timer expiration
    162       1.1       cgd  * (called from the software clock routine), then timertype tells which timer.
    163       1.1       cgd  */
    164       1.1       cgd /*ARGSUSED*/
    165       1.6   mycroft int
    166  1.81.2.6     skrll tcp_usrreq(struct socket *so, int req,
    167  1.81.2.6     skrll     struct mbuf *m, struct mbuf *nam, struct mbuf *control, struct lwp *l)
    168  1.81.2.3     skrll {
    169      1.49  augustss 	struct inpcb *inp;
    170      1.40    itojun #ifdef INET6
    171      1.49  augustss 	struct in6pcb *in6p;
    172      1.40    itojun #endif
    173      1.49  augustss 	struct tcpcb *tp = NULL;
    174  1.81.2.6     skrll 	struct proc *p;
    175       1.1       cgd 	int s;
    176       1.1       cgd 	int error = 0;
    177      1.74    simonb #ifdef TCP_DEBUG
    178      1.74    simonb 	int ostate = 0;
    179      1.74    simonb #endif
    180      1.40    itojun 	int family;	/* family of the socket */
    181      1.40    itojun 
    182  1.81.2.4     skrll 	p = l ? l->l_proc : NULL;
    183      1.40    itojun 	family = so->so_proto->pr_domain->dom_family;
    184       1.1       cgd 
    185      1.40    itojun 	if (req == PRU_CONTROL) {
    186      1.40    itojun 		switch (family) {
    187      1.56    itojun #ifdef INET
    188      1.40    itojun 		case PF_INET:
    189      1.40    itojun 			return (in_control(so, (long)m, (caddr_t)nam,
    190      1.40    itojun 			    (struct ifnet *)control, p));
    191      1.56    itojun #endif
    192      1.40    itojun #ifdef INET6
    193      1.40    itojun 		case PF_INET6:
    194      1.40    itojun 			return (in6_control(so, (long)m, (caddr_t)nam,
    195      1.40    itojun 			    (struct ifnet *)control, p));
    196      1.40    itojun #endif
    197      1.40    itojun 		default:
    198      1.40    itojun 			return EAFNOSUPPORT;
    199      1.40    itojun 		}
    200      1.45   thorpej 	}
    201      1.45   thorpej 
    202      1.46   thorpej 	if (req == PRU_PURGEIF) {
    203      1.54     enami 		switch (family) {
    204      1.56    itojun #ifdef INET
    205      1.54     enami 		case PF_INET:
    206      1.62    itojun 			in_pcbpurgeif0(&tcbtable, (struct ifnet *)control);
    207      1.54     enami 			in_purgeif((struct ifnet *)control);
    208      1.54     enami 			in_pcbpurgeif(&tcbtable, (struct ifnet *)control);
    209      1.55     enami 			break;
    210      1.56    itojun #endif
    211      1.46   thorpej #ifdef INET6
    212      1.54     enami 		case PF_INET6:
    213  1.81.2.2     skrll 			in6_pcbpurgeif0(&tcbtable, (struct ifnet *)control);
    214      1.54     enami 			in6_purgeif((struct ifnet *)control);
    215  1.81.2.2     skrll 			in6_pcbpurgeif(&tcbtable, (struct ifnet *)control);
    216      1.55     enami 			break;
    217      1.46   thorpej #endif
    218      1.54     enami 		default:
    219      1.54     enami 			return (EAFNOSUPPORT);
    220      1.54     enami 		}
    221      1.45   thorpej 		return (0);
    222      1.40    itojun 	}
    223      1.22   mycroft 
    224      1.22   mycroft 	s = splsoftnet();
    225      1.40    itojun 	switch (family) {
    226      1.56    itojun #ifdef INET
    227      1.40    itojun 	case PF_INET:
    228      1.40    itojun 		inp = sotoinpcb(so);
    229      1.40    itojun #ifdef INET6
    230      1.40    itojun 		in6p = NULL;
    231      1.40    itojun #endif
    232      1.40    itojun 		break;
    233      1.56    itojun #endif
    234      1.40    itojun #ifdef INET6
    235      1.40    itojun 	case PF_INET6:
    236      1.40    itojun 		inp = NULL;
    237      1.40    itojun 		in6p = sotoin6pcb(so);
    238      1.40    itojun 		break;
    239      1.40    itojun #endif
    240      1.40    itojun 	default:
    241      1.40    itojun 		splx(s);
    242      1.40    itojun 		return EAFNOSUPPORT;
    243      1.40    itojun 	}
    244      1.40    itojun 
    245      1.23   mycroft #ifdef DIAGNOSTIC
    246      1.57    itojun #ifdef INET6
    247      1.56    itojun 	if (inp && in6p)
    248      1.56    itojun 		panic("tcp_usrreq: both inp and in6p set to non-NULL");
    249      1.57    itojun #endif
    250      1.23   mycroft 	if (req != PRU_SEND && req != PRU_SENDOOB && control)
    251      1.23   mycroft 		panic("tcp_usrreq: unexpected control mbuf");
    252      1.23   mycroft #endif
    253       1.1       cgd 	/*
    254       1.1       cgd 	 * When a TCP is attached to a socket, then there will be
    255       1.1       cgd 	 * a (struct inpcb) pointed at by the socket, and this
    256       1.1       cgd 	 * structure will point at a subsidary (struct tcpcb).
    257       1.1       cgd 	 */
    258      1.40    itojun #ifndef INET6
    259      1.40    itojun 	if (inp == 0 && req != PRU_ATTACH)
    260      1.40    itojun #else
    261      1.40    itojun 	if ((inp == 0 && in6p == 0) && req != PRU_ATTACH)
    262      1.40    itojun #endif
    263      1.40    itojun 	{
    264      1.22   mycroft 		error = EINVAL;
    265      1.22   mycroft 		goto release;
    266       1.1       cgd 	}
    267      1.56    itojun #ifdef INET
    268       1.1       cgd 	if (inp) {
    269       1.1       cgd 		tp = intotcpcb(inp);
    270       1.1       cgd 		/* WHAT IF TP IS 0? */
    271       1.1       cgd #ifdef KPROF
    272       1.1       cgd 		tcp_acounts[tp->t_state][req]++;
    273       1.1       cgd #endif
    274      1.74    simonb #ifdef TCP_DEBUG
    275       1.1       cgd 		ostate = tp->t_state;
    276      1.74    simonb #endif
    277      1.40    itojun 	}
    278      1.56    itojun #endif
    279      1.40    itojun #ifdef INET6
    280      1.56    itojun 	if (in6p) {
    281      1.40    itojun 		tp = in6totcpcb(in6p);
    282      1.40    itojun 		/* WHAT IF TP IS 0? */
    283      1.40    itojun #ifdef KPROF
    284      1.40    itojun 		tcp_acounts[tp->t_state][req]++;
    285      1.40    itojun #endif
    286      1.74    simonb #ifdef TCP_DEBUG
    287      1.40    itojun 		ostate = tp->t_state;
    288      1.74    simonb #endif
    289      1.40    itojun 	}
    290      1.40    itojun #endif
    291      1.22   mycroft 
    292       1.1       cgd 	switch (req) {
    293       1.1       cgd 
    294       1.1       cgd 	/*
    295       1.1       cgd 	 * TCP attaches to socket via PRU_ATTACH, reserving space,
    296       1.1       cgd 	 * and an internet control block.
    297       1.1       cgd 	 */
    298       1.1       cgd 	case PRU_ATTACH:
    299      1.40    itojun #ifndef INET6
    300      1.40    itojun 		if (inp != 0)
    301      1.40    itojun #else
    302      1.40    itojun 		if (inp != 0 || in6p != 0)
    303      1.40    itojun #endif
    304      1.40    itojun 		{
    305       1.1       cgd 			error = EISCONN;
    306       1.1       cgd 			break;
    307       1.1       cgd 		}
    308       1.1       cgd 		error = tcp_attach(so);
    309       1.1       cgd 		if (error)
    310       1.1       cgd 			break;
    311       1.1       cgd 		if ((so->so_options & SO_LINGER) && so->so_linger == 0)
    312      1.32   thorpej 			so->so_linger = TCP_LINGERTIME;
    313       1.1       cgd 		tp = sototcpcb(so);
    314       1.1       cgd 		break;
    315       1.1       cgd 
    316       1.1       cgd 	/*
    317       1.1       cgd 	 * PRU_DETACH detaches the TCP protocol from the socket.
    318       1.1       cgd 	 */
    319       1.1       cgd 	case PRU_DETACH:
    320      1.24    kleink 		tp = tcp_disconnect(tp);
    321       1.1       cgd 		break;
    322       1.1       cgd 
    323       1.1       cgd 	/*
    324       1.1       cgd 	 * Give the socket an address.
    325       1.1       cgd 	 */
    326       1.1       cgd 	case PRU_BIND:
    327      1.40    itojun 		switch (family) {
    328      1.56    itojun #ifdef INET
    329      1.40    itojun 		case PF_INET:
    330      1.40    itojun 			error = in_pcbbind(inp, nam, p);
    331      1.40    itojun 			break;
    332      1.56    itojun #endif
    333      1.40    itojun #ifdef INET6
    334      1.40    itojun 		case PF_INET6:
    335      1.51    itojun 			error = in6_pcbbind(in6p, nam, p);
    336      1.58    itojun 			if (!error) {
    337      1.58    itojun 				/* mapped addr case */
    338      1.58    itojun 				if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr))
    339      1.58    itojun 					tp->t_family = AF_INET;
    340      1.58    itojun 				else
    341      1.58    itojun 					tp->t_family = AF_INET6;
    342      1.58    itojun 			}
    343      1.40    itojun 			break;
    344      1.40    itojun #endif
    345      1.40    itojun 		}
    346       1.1       cgd 		break;
    347       1.1       cgd 
    348       1.1       cgd 	/*
    349       1.1       cgd 	 * Prepare to accept connections.
    350       1.1       cgd 	 */
    351       1.1       cgd 	case PRU_LISTEN:
    352      1.56    itojun #ifdef INET
    353      1.40    itojun 		if (inp && inp->inp_lport == 0) {
    354      1.21   mycroft 			error = in_pcbbind(inp, (struct mbuf *)0,
    355      1.21   mycroft 			    (struct proc *)0);
    356      1.22   mycroft 			if (error)
    357      1.22   mycroft 				break;
    358      1.22   mycroft 		}
    359      1.56    itojun #endif
    360      1.40    itojun #ifdef INET6
    361      1.56    itojun 		if (in6p && in6p->in6p_lport == 0) {
    362      1.51    itojun 			error = in6_pcbbind(in6p, (struct mbuf *)0,
    363      1.51    itojun 			    (struct proc *)0);
    364      1.40    itojun 			if (error)
    365      1.40    itojun 				break;
    366      1.40    itojun 		}
    367      1.40    itojun #endif
    368      1.22   mycroft 		tp->t_state = TCPS_LISTEN;
    369       1.1       cgd 		break;
    370       1.1       cgd 
    371       1.1       cgd 	/*
    372       1.1       cgd 	 * Initiate connection to peer.
    373       1.1       cgd 	 * Create a template for use in transmissions on this connection.
    374       1.1       cgd 	 * Enter SYN_SENT state, and mark socket as connecting.
    375       1.1       cgd 	 * Start keep-alive timer, and seed output sequence space.
    376       1.1       cgd 	 * Send initial segment on connection.
    377       1.1       cgd 	 */
    378       1.1       cgd 	case PRU_CONNECT:
    379      1.56    itojun #ifdef INET
    380      1.40    itojun 		if (inp) {
    381      1.40    itojun 			if (inp->inp_lport == 0) {
    382      1.40    itojun 				error = in_pcbbind(inp, (struct mbuf *)0,
    383      1.40    itojun 				    (struct proc *)0);
    384      1.40    itojun 				if (error)
    385      1.40    itojun 					break;
    386      1.40    itojun 			}
    387      1.40    itojun 			error = in_pcbconnect(inp, nam);
    388      1.40    itojun 		}
    389      1.56    itojun #endif
    390      1.40    itojun #ifdef INET6
    391      1.56    itojun 		if (in6p) {
    392      1.40    itojun 			if (in6p->in6p_lport == 0) {
    393      1.51    itojun 				error = in6_pcbbind(in6p, (struct mbuf *)0,
    394      1.51    itojun 				    (struct proc *)0);
    395      1.40    itojun 				if (error)
    396      1.40    itojun 					break;
    397      1.40    itojun 			}
    398      1.40    itojun 			error = in6_pcbconnect(in6p, nam);
    399      1.58    itojun 			if (!error) {
    400      1.58    itojun 				/* mapped addr case */
    401      1.58    itojun 				if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr))
    402      1.58    itojun 					tp->t_family = AF_INET;
    403      1.58    itojun 				else
    404      1.58    itojun 					tp->t_family = AF_INET6;
    405      1.58    itojun 			}
    406       1.1       cgd 		}
    407      1.40    itojun #endif
    408       1.1       cgd 		if (error)
    409       1.1       cgd 			break;
    410       1.1       cgd 		tp->t_template = tcp_template(tp);
    411       1.1       cgd 		if (tp->t_template == 0) {
    412      1.56    itojun #ifdef INET
    413      1.40    itojun 			if (inp)
    414      1.40    itojun 				in_pcbdisconnect(inp);
    415      1.56    itojun #endif
    416      1.40    itojun #ifdef INET6
    417      1.56    itojun 			if (in6p)
    418      1.40    itojun 				in6_pcbdisconnect(in6p);
    419      1.40    itojun #endif
    420       1.1       cgd 			error = ENOBUFS;
    421       1.1       cgd 			break;
    422       1.1       cgd 		}
    423       1.9   mycroft 		/* Compute window scaling to request.  */
    424       1.9   mycroft 		while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
    425       1.9   mycroft 		    (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
    426       1.9   mycroft 			tp->request_r_scale++;
    427       1.1       cgd 		soisconnecting(so);
    428       1.1       cgd 		tcpstat.tcps_connattempt++;
    429       1.1       cgd 		tp->t_state = TCPS_SYN_SENT;
    430      1.37   thorpej 		TCP_TIMER_ARM(tp, TCPT_KEEP, TCPTV_KEEP_INIT);
    431      1.61   thorpej 		tp->iss = tcp_new_iss(tp, 0);
    432       1.1       cgd 		tcp_sendseqinit(tp);
    433       1.1       cgd 		error = tcp_output(tp);
    434       1.1       cgd 		break;
    435       1.1       cgd 
    436       1.1       cgd 	/*
    437       1.1       cgd 	 * Create a TCP connection between two sockets.
    438       1.1       cgd 	 */
    439       1.1       cgd 	case PRU_CONNECT2:
    440       1.1       cgd 		error = EOPNOTSUPP;
    441       1.1       cgd 		break;
    442       1.1       cgd 
    443       1.1       cgd 	/*
    444       1.1       cgd 	 * Initiate disconnect from peer.
    445       1.1       cgd 	 * If connection never passed embryonic stage, just drop;
    446       1.1       cgd 	 * else if don't need to let data drain, then can just drop anyways,
    447       1.1       cgd 	 * else have to begin TCP shutdown process: mark socket disconnecting,
    448       1.1       cgd 	 * drain unread data, state switch to reflect user close, and
    449       1.1       cgd 	 * send segment (e.g. FIN) to peer.  Socket will be really disconnected
    450       1.1       cgd 	 * when peer sends FIN and acks ours.
    451       1.1       cgd 	 *
    452       1.1       cgd 	 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
    453       1.1       cgd 	 */
    454       1.1       cgd 	case PRU_DISCONNECT:
    455       1.1       cgd 		tp = tcp_disconnect(tp);
    456       1.1       cgd 		break;
    457       1.1       cgd 
    458       1.1       cgd 	/*
    459       1.1       cgd 	 * Accept a connection.  Essentially all the work is
    460       1.1       cgd 	 * done at higher levels; just return the address
    461       1.1       cgd 	 * of the peer, storing through addr.
    462       1.1       cgd 	 */
    463       1.8   mycroft 	case PRU_ACCEPT:
    464      1.56    itojun #ifdef INET
    465      1.40    itojun 		if (inp)
    466      1.40    itojun 			in_setpeeraddr(inp, nam);
    467      1.56    itojun #endif
    468      1.40    itojun #ifdef INET6
    469      1.56    itojun 		if (in6p)
    470      1.40    itojun 			in6_setpeeraddr(in6p, nam);
    471      1.40    itojun #endif
    472       1.1       cgd 		break;
    473       1.1       cgd 
    474       1.1       cgd 	/*
    475       1.1       cgd 	 * Mark the connection as being incapable of further output.
    476       1.1       cgd 	 */
    477       1.1       cgd 	case PRU_SHUTDOWN:
    478       1.1       cgd 		socantsendmore(so);
    479       1.1       cgd 		tp = tcp_usrclosed(tp);
    480       1.1       cgd 		if (tp)
    481       1.1       cgd 			error = tcp_output(tp);
    482       1.1       cgd 		break;
    483       1.1       cgd 
    484       1.1       cgd 	/*
    485       1.1       cgd 	 * After a receive, possibly send window update to peer.
    486       1.1       cgd 	 */
    487       1.1       cgd 	case PRU_RCVD:
    488      1.60    itojun 		/*
    489      1.60    itojun 		 * soreceive() calls this function when a user receives
    490      1.60    itojun 		 * ancillary data on a listening socket. We don't call
    491      1.60    itojun 		 * tcp_output in such a case, since there is no header
    492      1.60    itojun 		 * template for a listening socket and hence the kernel
    493      1.60    itojun 		 * will panic.
    494      1.60    itojun 		 */
    495      1.60    itojun 		if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) != 0)
    496      1.60    itojun 			(void) tcp_output(tp);
    497       1.1       cgd 		break;
    498       1.1       cgd 
    499       1.1       cgd 	/*
    500       1.1       cgd 	 * Do a send by putting data in output queue and updating urgent
    501       1.1       cgd 	 * marker if URG set.  Possibly send more data.
    502       1.1       cgd 	 */
    503       1.1       cgd 	case PRU_SEND:
    504      1.23   mycroft 		if (control && control->m_len) {
    505      1.23   mycroft 			m_freem(control);
    506      1.23   mycroft 			m_freem(m);
    507      1.23   mycroft 			error = EINVAL;
    508      1.23   mycroft 			break;
    509      1.23   mycroft 		}
    510      1.73   thorpej 		sbappendstream(&so->so_snd, m);
    511       1.1       cgd 		error = tcp_output(tp);
    512       1.1       cgd 		break;
    513       1.1       cgd 
    514       1.1       cgd 	/*
    515       1.1       cgd 	 * Abort the TCP.
    516       1.1       cgd 	 */
    517       1.1       cgd 	case PRU_ABORT:
    518       1.1       cgd 		tp = tcp_drop(tp, ECONNABORTED);
    519       1.1       cgd 		break;
    520       1.1       cgd 
    521       1.1       cgd 	case PRU_SENSE:
    522      1.22   mycroft 		/*
    523      1.22   mycroft 		 * stat: don't bother with a blocksize.
    524      1.22   mycroft 		 */
    525      1.22   mycroft 		splx(s);
    526       1.1       cgd 		return (0);
    527       1.1       cgd 
    528       1.1       cgd 	case PRU_RCVOOB:
    529      1.23   mycroft 		if (control && control->m_len) {
    530      1.23   mycroft 			m_freem(control);
    531      1.23   mycroft 			m_freem(m);
    532      1.23   mycroft 			error = EINVAL;
    533      1.23   mycroft 			break;
    534      1.23   mycroft 		}
    535       1.1       cgd 		if ((so->so_oobmark == 0 &&
    536       1.1       cgd 		    (so->so_state & SS_RCVATMARK) == 0) ||
    537       1.1       cgd 		    so->so_options & SO_OOBINLINE ||
    538       1.1       cgd 		    tp->t_oobflags & TCPOOB_HADDATA) {
    539       1.1       cgd 			error = EINVAL;
    540       1.1       cgd 			break;
    541       1.1       cgd 		}
    542       1.1       cgd 		if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
    543       1.1       cgd 			error = EWOULDBLOCK;
    544       1.1       cgd 			break;
    545       1.1       cgd 		}
    546       1.1       cgd 		m->m_len = 1;
    547       1.1       cgd 		*mtod(m, caddr_t) = tp->t_iobc;
    548      1.14       cgd 		if (((long)nam & MSG_PEEK) == 0)
    549       1.1       cgd 			tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
    550       1.1       cgd 		break;
    551       1.1       cgd 
    552       1.1       cgd 	case PRU_SENDOOB:
    553       1.1       cgd 		if (sbspace(&so->so_snd) < -512) {
    554       1.1       cgd 			m_freem(m);
    555       1.1       cgd 			error = ENOBUFS;
    556       1.1       cgd 			break;
    557       1.1       cgd 		}
    558       1.1       cgd 		/*
    559       1.1       cgd 		 * According to RFC961 (Assigned Protocols),
    560       1.1       cgd 		 * the urgent pointer points to the last octet
    561       1.1       cgd 		 * of urgent data.  We continue, however,
    562       1.1       cgd 		 * to consider it to indicate the first octet
    563       1.1       cgd 		 * of data past the urgent section.
    564       1.1       cgd 		 * Otherwise, snd_up should be one lower.
    565       1.1       cgd 		 */
    566      1.73   thorpej 		sbappendstream(&so->so_snd, m);
    567       1.1       cgd 		tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
    568       1.1       cgd 		tp->t_force = 1;
    569       1.1       cgd 		error = tcp_output(tp);
    570       1.1       cgd 		tp->t_force = 0;
    571       1.1       cgd 		break;
    572       1.1       cgd 
    573       1.1       cgd 	case PRU_SOCKADDR:
    574      1.56    itojun #ifdef INET
    575      1.40    itojun 		if (inp)
    576      1.40    itojun 			in_setsockaddr(inp, nam);
    577      1.56    itojun #endif
    578      1.40    itojun #ifdef INET6
    579      1.56    itojun 		if (in6p)
    580      1.40    itojun 			in6_setsockaddr(in6p, nam);
    581      1.40    itojun #endif
    582       1.1       cgd 		break;
    583       1.1       cgd 
    584       1.1       cgd 	case PRU_PEERADDR:
    585      1.56    itojun #ifdef INET
    586      1.40    itojun 		if (inp)
    587      1.40    itojun 			in_setpeeraddr(inp, nam);
    588      1.56    itojun #endif
    589      1.40    itojun #ifdef INET6
    590      1.56    itojun 		if (in6p)
    591      1.40    itojun 			in6_setpeeraddr(in6p, nam);
    592      1.40    itojun #endif
    593       1.1       cgd 		break;
    594       1.1       cgd 
    595       1.1       cgd 	default:
    596       1.1       cgd 		panic("tcp_usrreq");
    597       1.1       cgd 	}
    598      1.63       abs #ifdef TCP_DEBUG
    599       1.1       cgd 	if (tp && (so->so_options & SO_DEBUG))
    600      1.40    itojun 		tcp_trace(TA_USER, ostate, tp, NULL, req);
    601      1.63       abs #endif
    602      1.22   mycroft 
    603      1.22   mycroft release:
    604       1.1       cgd 	splx(s);
    605       1.1       cgd 	return (error);
    606       1.1       cgd }
    607       1.1       cgd 
    608       1.6   mycroft int
    609  1.81.2.6     skrll tcp_ctloutput(int op, struct socket *so, int level, int optname,
    610  1.81.2.6     skrll     struct mbuf **mp)
    611       1.1       cgd {
    612       1.9   mycroft 	int error = 0, s;
    613       1.9   mycroft 	struct inpcb *inp;
    614      1.40    itojun #ifdef INET6
    615      1.49  augustss 	struct in6pcb *in6p;
    616      1.40    itojun #endif
    617      1.49  augustss 	struct tcpcb *tp;
    618      1.49  augustss 	struct mbuf *m;
    619      1.49  augustss 	int i;
    620      1.40    itojun 	int family;	/* family of the socket */
    621      1.40    itojun 
    622      1.40    itojun 	family = so->so_proto->pr_domain->dom_family;
    623       1.1       cgd 
    624      1.16   mycroft 	s = splsoftnet();
    625      1.40    itojun 	switch (family) {
    626      1.56    itojun #ifdef INET
    627      1.40    itojun 	case PF_INET:
    628      1.40    itojun 		inp = sotoinpcb(so);
    629      1.40    itojun #ifdef INET6
    630      1.40    itojun 		in6p = NULL;
    631      1.40    itojun #endif
    632      1.40    itojun 		break;
    633      1.56    itojun #endif
    634      1.40    itojun #ifdef INET6
    635      1.40    itojun 	case PF_INET6:
    636      1.40    itojun 		inp = NULL;
    637      1.40    itojun 		in6p = sotoin6pcb(so);
    638      1.40    itojun 		break;
    639      1.40    itojun #endif
    640      1.40    itojun 	default:
    641      1.40    itojun 		splx(s);
    642      1.40    itojun 		return EAFNOSUPPORT;
    643      1.40    itojun 	}
    644      1.40    itojun #ifndef INET6
    645      1.40    itojun 	if (inp == NULL)
    646      1.40    itojun #else
    647      1.40    itojun 	if (inp == NULL && in6p == NULL)
    648      1.40    itojun #endif
    649      1.40    itojun 	{
    650       1.9   mycroft 		splx(s);
    651       1.9   mycroft 		if (op == PRCO_SETOPT && *mp)
    652       1.9   mycroft 			(void) m_free(*mp);
    653       1.9   mycroft 		return (ECONNRESET);
    654       1.9   mycroft 	}
    655       1.9   mycroft 	if (level != IPPROTO_TCP) {
    656      1.40    itojun 		switch (family) {
    657      1.56    itojun #ifdef INET
    658      1.40    itojun 		case PF_INET:
    659      1.40    itojun 			error = ip_ctloutput(op, so, level, optname, mp);
    660      1.40    itojun 			break;
    661      1.56    itojun #endif
    662      1.40    itojun #ifdef INET6
    663      1.40    itojun 		case PF_INET6:
    664      1.40    itojun 			error = ip6_ctloutput(op, so, level, optname, mp);
    665      1.40    itojun 			break;
    666      1.40    itojun #endif
    667      1.40    itojun 		}
    668       1.9   mycroft 		splx(s);
    669       1.9   mycroft 		return (error);
    670       1.9   mycroft 	}
    671      1.40    itojun 	if (inp)
    672      1.40    itojun 		tp = intotcpcb(inp);
    673      1.40    itojun #ifdef INET6
    674      1.40    itojun 	else if (in6p)
    675      1.40    itojun 		tp = in6totcpcb(in6p);
    676      1.40    itojun #endif
    677      1.40    itojun 	else
    678      1.40    itojun 		tp = NULL;
    679       1.1       cgd 
    680       1.1       cgd 	switch (op) {
    681       1.1       cgd 
    682       1.1       cgd 	case PRCO_SETOPT:
    683       1.1       cgd 		m = *mp;
    684       1.1       cgd 		switch (optname) {
    685       1.1       cgd 
    686  1.81.2.2     skrll #ifdef TCP_SIGNATURE
    687  1.81.2.2     skrll 		case TCP_MD5SIG:
    688  1.81.2.2     skrll 			if (m == NULL || m->m_len < sizeof (int))
    689  1.81.2.2     skrll 				error = EINVAL;
    690  1.81.2.2     skrll 			if (error)
    691  1.81.2.2     skrll 				break;
    692  1.81.2.2     skrll 			if (*mtod(m, int *) > 0)
    693  1.81.2.2     skrll 				tp->t_flags |= TF_SIGNATURE;
    694  1.81.2.2     skrll 			else
    695  1.81.2.2     skrll 				tp->t_flags &= ~TF_SIGNATURE;
    696  1.81.2.2     skrll 			break;
    697  1.81.2.2     skrll #endif /* TCP_SIGNATURE */
    698  1.81.2.2     skrll 
    699       1.1       cgd 		case TCP_NODELAY:
    700       1.1       cgd 			if (m == NULL || m->m_len < sizeof (int))
    701       1.1       cgd 				error = EINVAL;
    702       1.1       cgd 			else if (*mtod(m, int *))
    703       1.1       cgd 				tp->t_flags |= TF_NODELAY;
    704       1.1       cgd 			else
    705       1.1       cgd 				tp->t_flags &= ~TF_NODELAY;
    706       1.1       cgd 			break;
    707       1.1       cgd 
    708       1.9   mycroft 		case TCP_MAXSEG:
    709      1.71    itojun 			if (m && (i = *mtod(m, int *)) > 0 &&
    710      1.28       kml 			    i <= tp->t_peermss)
    711      1.28       kml 				tp->t_peermss = i;  /* limit on send size */
    712       1.9   mycroft 			else
    713       1.9   mycroft 				error = EINVAL;
    714       1.9   mycroft 			break;
    715       1.9   mycroft 
    716       1.1       cgd 		default:
    717       1.9   mycroft 			error = ENOPROTOOPT;
    718       1.1       cgd 			break;
    719       1.1       cgd 		}
    720       1.1       cgd 		if (m)
    721       1.1       cgd 			(void) m_free(m);
    722       1.1       cgd 		break;
    723       1.1       cgd 
    724       1.1       cgd 	case PRCO_GETOPT:
    725       1.1       cgd 		*mp = m = m_get(M_WAIT, MT_SOOPTS);
    726       1.1       cgd 		m->m_len = sizeof(int);
    727      1.75      matt 		MCLAIM(m, so->so_mowner);
    728       1.1       cgd 
    729       1.1       cgd 		switch (optname) {
    730  1.81.2.2     skrll #ifdef TCP_SIGNATURE
    731  1.81.2.2     skrll 		case TCP_MD5SIG:
    732  1.81.2.2     skrll 			*mtod(m, int *) = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
    733  1.81.2.2     skrll 			break;
    734  1.81.2.2     skrll #endif
    735       1.1       cgd 		case TCP_NODELAY:
    736       1.1       cgd 			*mtod(m, int *) = tp->t_flags & TF_NODELAY;
    737       1.1       cgd 			break;
    738       1.1       cgd 		case TCP_MAXSEG:
    739      1.28       kml 			*mtod(m, int *) = tp->t_peermss;
    740       1.1       cgd 			break;
    741       1.1       cgd 		default:
    742       1.9   mycroft 			error = ENOPROTOOPT;
    743       1.1       cgd 			break;
    744       1.1       cgd 		}
    745       1.1       cgd 		break;
    746       1.1       cgd 	}
    747       1.9   mycroft 	splx(s);
    748       1.1       cgd 	return (error);
    749       1.1       cgd }
    750       1.1       cgd 
    751      1.11   mycroft #ifndef TCP_SENDSPACE
    752  1.81.2.2     skrll #define	TCP_SENDSPACE	1024*32
    753      1.11   mycroft #endif
    754      1.25   thorpej int	tcp_sendspace = TCP_SENDSPACE;
    755      1.11   mycroft #ifndef TCP_RECVSPACE
    756  1.81.2.2     skrll #define	TCP_RECVSPACE	1024*32
    757      1.11   mycroft #endif
    758      1.25   thorpej int	tcp_recvspace = TCP_RECVSPACE;
    759       1.1       cgd 
    760       1.1       cgd /*
    761       1.1       cgd  * Attach TCP protocol to socket, allocating
    762       1.1       cgd  * internet protocol control block, tcp control block,
    763       1.1       cgd  * bufer space, and entering LISTEN state if to accept connections.
    764       1.1       cgd  */
    765       1.6   mycroft int
    766  1.81.2.6     skrll tcp_attach(struct socket *so)
    767       1.1       cgd {
    768      1.49  augustss 	struct tcpcb *tp;
    769       1.1       cgd 	struct inpcb *inp;
    770      1.40    itojun #ifdef INET6
    771      1.40    itojun 	struct in6pcb *in6p;
    772      1.40    itojun #endif
    773       1.1       cgd 	int error;
    774      1.40    itojun 	int family;	/* family of the socket */
    775      1.40    itojun 
    776      1.40    itojun 	family = so->so_proto->pr_domain->dom_family;
    777       1.1       cgd 
    778      1.75      matt #ifdef MBUFTRACE
    779      1.75      matt 	so->so_mowner = &tcp_mowner;
    780      1.75      matt 	so->so_rcv.sb_mowner = &tcp_rx_mowner;
    781      1.75      matt 	so->so_snd.sb_mowner = &tcp_tx_mowner;
    782      1.75      matt #endif
    783       1.1       cgd 	if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
    784       1.1       cgd 		error = soreserve(so, tcp_sendspace, tcp_recvspace);
    785       1.1       cgd 		if (error)
    786       1.1       cgd 			return (error);
    787       1.1       cgd 	}
    788      1.40    itojun 	switch (family) {
    789      1.56    itojun #ifdef INET
    790      1.40    itojun 	case PF_INET:
    791      1.40    itojun 		error = in_pcballoc(so, &tcbtable);
    792      1.40    itojun 		if (error)
    793      1.40    itojun 			return (error);
    794      1.40    itojun 		inp = sotoinpcb(so);
    795      1.40    itojun #ifdef INET6
    796      1.40    itojun 		in6p = NULL;
    797      1.40    itojun #endif
    798      1.40    itojun 		break;
    799      1.56    itojun #endif
    800      1.40    itojun #ifdef INET6
    801      1.40    itojun 	case PF_INET6:
    802  1.81.2.2     skrll 		error = in6_pcballoc(so, &tcbtable);
    803      1.40    itojun 		if (error)
    804      1.40    itojun 			return (error);
    805      1.40    itojun 		inp = NULL;
    806      1.40    itojun 		in6p = sotoin6pcb(so);
    807      1.40    itojun 		break;
    808      1.40    itojun #endif
    809      1.40    itojun 	default:
    810      1.40    itojun 		return EAFNOSUPPORT;
    811      1.40    itojun 	}
    812      1.40    itojun 	if (inp)
    813      1.40    itojun 		tp = tcp_newtcpcb(family, (void *)inp);
    814      1.40    itojun #ifdef INET6
    815      1.40    itojun 	else if (in6p)
    816      1.40    itojun 		tp = tcp_newtcpcb(family, (void *)in6p);
    817      1.40    itojun #endif
    818      1.41    itojun 	else
    819      1.41    itojun 		tp = NULL;
    820      1.40    itojun 
    821       1.1       cgd 	if (tp == 0) {
    822       1.1       cgd 		int nofd = so->so_state & SS_NOFDREF;	/* XXX */
    823       1.1       cgd 
    824       1.1       cgd 		so->so_state &= ~SS_NOFDREF;	/* don't free the socket yet */
    825      1.56    itojun #ifdef INET
    826      1.40    itojun 		if (inp)
    827      1.40    itojun 			in_pcbdetach(inp);
    828      1.56    itojun #endif
    829      1.40    itojun #ifdef INET6
    830      1.56    itojun 		if (in6p)
    831      1.40    itojun 			in6_pcbdetach(in6p);
    832      1.40    itojun #endif
    833       1.1       cgd 		so->so_state |= nofd;
    834       1.1       cgd 		return (ENOBUFS);
    835       1.1       cgd 	}
    836       1.1       cgd 	tp->t_state = TCPS_CLOSED;
    837       1.1       cgd 	return (0);
    838       1.1       cgd }
    839       1.1       cgd 
    840       1.1       cgd /*
    841       1.1       cgd  * Initiate (or continue) disconnect.
    842       1.1       cgd  * If embryonic state, just send reset (once).
    843       1.1       cgd  * If in ``let data drain'' option and linger null, just drop.
    844       1.1       cgd  * Otherwise (hard), mark socket disconnecting and drop
    845       1.1       cgd  * current input data; switch states based on user close, and
    846       1.1       cgd  * send segment to peer (with FIN).
    847       1.1       cgd  */
    848       1.1       cgd struct tcpcb *
    849  1.81.2.6     skrll tcp_disconnect(struct tcpcb *tp)
    850       1.1       cgd {
    851      1.40    itojun 	struct socket *so;
    852      1.40    itojun 
    853      1.40    itojun 	if (tp->t_inpcb)
    854      1.40    itojun 		so = tp->t_inpcb->inp_socket;
    855      1.40    itojun #ifdef INET6
    856      1.40    itojun 	else if (tp->t_in6pcb)
    857      1.40    itojun 		so = tp->t_in6pcb->in6p_socket;
    858      1.40    itojun #endif
    859      1.40    itojun 	else
    860      1.40    itojun 		so = NULL;
    861       1.1       cgd 
    862      1.12   mycroft 	if (TCPS_HAVEESTABLISHED(tp->t_state) == 0)
    863       1.1       cgd 		tp = tcp_close(tp);
    864       1.1       cgd 	else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
    865       1.1       cgd 		tp = tcp_drop(tp, 0);
    866       1.1       cgd 	else {
    867       1.1       cgd 		soisdisconnecting(so);
    868       1.1       cgd 		sbflush(&so->so_rcv);
    869       1.1       cgd 		tp = tcp_usrclosed(tp);
    870       1.1       cgd 		if (tp)
    871       1.1       cgd 			(void) tcp_output(tp);
    872       1.1       cgd 	}
    873       1.1       cgd 	return (tp);
    874       1.1       cgd }
    875       1.1       cgd 
    876       1.1       cgd /*
    877       1.1       cgd  * User issued close, and wish to trail through shutdown states:
    878       1.1       cgd  * if never received SYN, just forget it.  If got a SYN from peer,
    879       1.1       cgd  * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
    880       1.1       cgd  * If already got a FIN from peer, then almost done; go to LAST_ACK
    881       1.1       cgd  * state.  In all other cases, have already sent FIN to peer (e.g.
    882       1.1       cgd  * after PRU_SHUTDOWN), and just have to play tedious game waiting
    883       1.1       cgd  * for peer to send FIN or not respond to keep-alives, etc.
    884       1.1       cgd  * We can let the user exit from the close as soon as the FIN is acked.
    885       1.1       cgd  */
    886       1.1       cgd struct tcpcb *
    887  1.81.2.6     skrll tcp_usrclosed(struct tcpcb *tp)
    888       1.1       cgd {
    889       1.1       cgd 
    890       1.1       cgd 	switch (tp->t_state) {
    891       1.1       cgd 
    892       1.1       cgd 	case TCPS_CLOSED:
    893       1.1       cgd 	case TCPS_LISTEN:
    894       1.1       cgd 	case TCPS_SYN_SENT:
    895       1.1       cgd 		tp->t_state = TCPS_CLOSED;
    896       1.1       cgd 		tp = tcp_close(tp);
    897       1.1       cgd 		break;
    898       1.1       cgd 
    899       1.1       cgd 	case TCPS_SYN_RECEIVED:
    900       1.1       cgd 	case TCPS_ESTABLISHED:
    901       1.1       cgd 		tp->t_state = TCPS_FIN_WAIT_1;
    902       1.1       cgd 		break;
    903       1.1       cgd 
    904       1.1       cgd 	case TCPS_CLOSE_WAIT:
    905       1.1       cgd 		tp->t_state = TCPS_LAST_ACK;
    906       1.1       cgd 		break;
    907       1.1       cgd 	}
    908      1.18   mycroft 	if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
    909      1.40    itojun 		struct socket *so;
    910      1.40    itojun 		if (tp->t_inpcb)
    911      1.40    itojun 			so = tp->t_inpcb->inp_socket;
    912      1.40    itojun #ifdef INET6
    913      1.40    itojun 		else if (tp->t_in6pcb)
    914      1.40    itojun 			so = tp->t_in6pcb->in6p_socket;
    915      1.40    itojun #endif
    916      1.40    itojun 		else
    917      1.40    itojun 			so = NULL;
    918      1.40    itojun 		soisdisconnected(so);
    919      1.19   mycroft 		/*
    920      1.19   mycroft 		 * If we are in FIN_WAIT_2, we arrived here because the
    921      1.19   mycroft 		 * application did a shutdown of the send side.  Like the
    922      1.19   mycroft 		 * case of a transition from FIN_WAIT_1 to FIN_WAIT_2 after
    923      1.19   mycroft 		 * a full close, we start a timer to make sure sockets are
    924      1.19   mycroft 		 * not left in FIN_WAIT_2 forever.
    925      1.19   mycroft 		 */
    926      1.38     mouse 		if ((tp->t_state == TCPS_FIN_WAIT_2) && (tcp_maxidle > 0))
    927      1.37   thorpej 			TCP_TIMER_ARM(tp, TCPT_2MSL, tcp_maxidle);
    928      1.18   mycroft 	}
    929       1.1       cgd 	return (tp);
    930      1.17   thorpej }
    931      1.17   thorpej 
    932  1.81.2.2     skrll /*
    933  1.81.2.2     skrll  * sysctl helper routine for net.inet.ip.mssdflt.  it can't be less
    934  1.81.2.2     skrll  * than 32.
    935  1.81.2.2     skrll  */
    936  1.81.2.2     skrll static int
    937  1.81.2.2     skrll sysctl_net_inet_tcp_mssdflt(SYSCTLFN_ARGS)
    938  1.81.2.2     skrll {
    939  1.81.2.2     skrll 	int error, mssdflt;
    940  1.81.2.2     skrll 	struct sysctlnode node;
    941  1.81.2.2     skrll 
    942  1.81.2.2     skrll 	mssdflt = tcp_mssdflt;
    943  1.81.2.2     skrll 	node = *rnode;
    944  1.81.2.2     skrll 	node.sysctl_data = &mssdflt;
    945  1.81.2.2     skrll 	error = sysctl_lookup(SYSCTLFN_CALL(&node));
    946  1.81.2.2     skrll 	if (error || newp == NULL)
    947  1.81.2.2     skrll 		return (error);
    948  1.81.2.2     skrll 
    949  1.81.2.2     skrll 	if (mssdflt < 32)
    950  1.81.2.2     skrll 		return (EINVAL);
    951  1.81.2.2     skrll 	tcp_mssdflt = mssdflt;
    952  1.81.2.2     skrll 
    953  1.81.2.2     skrll 	return (0);
    954  1.81.2.2     skrll }
    955      1.36      matt 
    956      1.17   thorpej /*
    957  1.81.2.2     skrll  * sysctl helper routine for setting port related values under
    958  1.81.2.2     skrll  * net.inet.ip and net.inet6.ip6.  does basic range checking and does
    959  1.81.2.2     skrll  * additional checks for each type.  this code has placed in
    960  1.81.2.2     skrll  * tcp_input.c since INET and INET6 both use the same tcp code.
    961  1.81.2.2     skrll  *
    962  1.81.2.2     skrll  * this helper is not static so that both inet and inet6 can use it.
    963      1.17   thorpej  */
    964      1.17   thorpej int
    965  1.81.2.2     skrll sysctl_net_inet_ip_ports(SYSCTLFN_ARGS)
    966      1.17   thorpej {
    967  1.81.2.2     skrll 	int error, tmp;
    968  1.81.2.2     skrll 	int apmin, apmax;
    969  1.81.2.2     skrll #ifndef IPNOPRIVPORTS
    970  1.81.2.2     skrll 	int lpmin, lpmax;
    971  1.81.2.2     skrll #endif /* IPNOPRIVPORTS */
    972  1.81.2.2     skrll 	struct sysctlnode node;
    973      1.48   thorpej 
    974  1.81.2.2     skrll 	if (namelen != 0)
    975  1.81.2.2     skrll 		return (EINVAL);
    976  1.81.2.2     skrll 
    977  1.81.2.2     skrll 	switch (name[-3]) {
    978  1.81.2.2     skrll #ifdef INET
    979  1.81.2.2     skrll 	    case PF_INET:
    980  1.81.2.2     skrll 		apmin = anonportmin;
    981  1.81.2.2     skrll 		apmax = anonportmax;
    982  1.81.2.2     skrll #ifndef IPNOPRIVPORTS
    983  1.81.2.2     skrll 		lpmin = lowportmin;
    984  1.81.2.2     skrll 		lpmax = lowportmax;
    985  1.81.2.2     skrll #endif /* IPNOPRIVPORTS */
    986  1.81.2.2     skrll 		break;
    987  1.81.2.2     skrll #endif /* INET */
    988  1.81.2.2     skrll #ifdef INET6
    989  1.81.2.2     skrll 	    case PF_INET6:
    990  1.81.2.2     skrll 		apmin = ip6_anonportmin;
    991  1.81.2.2     skrll 		apmax = ip6_anonportmax;
    992  1.81.2.2     skrll #ifndef IPNOPRIVPORTS
    993  1.81.2.2     skrll 		lpmin = ip6_lowportmin;
    994  1.81.2.2     skrll 		lpmax = ip6_lowportmax;
    995  1.81.2.2     skrll #endif /* IPNOPRIVPORTS */
    996  1.81.2.2     skrll 		break;
    997  1.81.2.2     skrll #endif /* INET6 */
    998  1.81.2.2     skrll 	    default:
    999  1.81.2.2     skrll 		return (EINVAL);
   1000  1.81.2.2     skrll 	}
   1001  1.81.2.2     skrll 
   1002  1.81.2.2     skrll 	/*
   1003  1.81.2.2     skrll 	 * insert temporary copy into node, perform lookup on
   1004  1.81.2.2     skrll 	 * temporary, then restore pointer
   1005  1.81.2.2     skrll 	 */
   1006  1.81.2.2     skrll 	node = *rnode;
   1007  1.81.2.2     skrll 	tmp = *(int*)rnode->sysctl_data;
   1008  1.81.2.2     skrll 	node.sysctl_data = &tmp;
   1009  1.81.2.2     skrll 	error = sysctl_lookup(SYSCTLFN_CALL(&node));
   1010  1.81.2.2     skrll 	if (error || newp == NULL)
   1011  1.81.2.2     skrll 		return (error);
   1012  1.81.2.2     skrll 
   1013  1.81.2.2     skrll 	/*
   1014  1.81.2.2     skrll 	 * simple port range check
   1015  1.81.2.2     skrll 	 */
   1016  1.81.2.2     skrll 	if (tmp < 0 || tmp > 65535)
   1017  1.81.2.2     skrll 		return (EINVAL);
   1018  1.81.2.2     skrll 
   1019  1.81.2.2     skrll 	/*
   1020  1.81.2.2     skrll 	 * per-node range checks
   1021  1.81.2.2     skrll 	 */
   1022  1.81.2.2     skrll 	switch (rnode->sysctl_num) {
   1023  1.81.2.2     skrll 	case IPCTL_ANONPORTMIN:
   1024  1.81.2.2     skrll 		if (tmp >= apmax)
   1025  1.81.2.2     skrll 			return (EINVAL);
   1026  1.81.2.2     skrll #ifndef IPNOPRIVPORTS
   1027  1.81.2.2     skrll 		if (tmp < IPPORT_RESERVED)
   1028  1.81.2.2     skrll                         return (EINVAL);
   1029  1.81.2.2     skrll #endif /* IPNOPRIVPORTS */
   1030  1.81.2.2     skrll 		break;
   1031  1.81.2.2     skrll 
   1032  1.81.2.2     skrll 	case IPCTL_ANONPORTMAX:
   1033  1.81.2.2     skrll                 if (apmin >= tmp)
   1034  1.81.2.2     skrll 			return (EINVAL);
   1035  1.81.2.2     skrll #ifndef IPNOPRIVPORTS
   1036  1.81.2.2     skrll 		if (tmp < IPPORT_RESERVED)
   1037  1.81.2.2     skrll                         return (EINVAL);
   1038  1.81.2.2     skrll #endif /* IPNOPRIVPORTS */
   1039  1.81.2.2     skrll 		break;
   1040  1.81.2.2     skrll 
   1041  1.81.2.2     skrll #ifndef IPNOPRIVPORTS
   1042  1.81.2.2     skrll 	case IPCTL_LOWPORTMIN:
   1043  1.81.2.2     skrll 		if (tmp >= lpmax ||
   1044  1.81.2.2     skrll 		    tmp > IPPORT_RESERVEDMAX ||
   1045  1.81.2.2     skrll 		    tmp < IPPORT_RESERVEDMIN)
   1046  1.81.2.2     skrll 			return (EINVAL);
   1047  1.81.2.2     skrll 		break;
   1048  1.81.2.2     skrll 
   1049  1.81.2.2     skrll 	case IPCTL_LOWPORTMAX:
   1050  1.81.2.2     skrll 		if (lpmin >= tmp ||
   1051  1.81.2.2     skrll 		    tmp > IPPORT_RESERVEDMAX ||
   1052  1.81.2.2     skrll 		    tmp < IPPORT_RESERVEDMIN)
   1053  1.81.2.2     skrll 			return (EINVAL);
   1054  1.81.2.2     skrll 		break;
   1055  1.81.2.2     skrll #endif /* IPNOPRIVPORTS */
   1056  1.81.2.2     skrll 
   1057  1.81.2.2     skrll 	default:
   1058  1.81.2.2     skrll 		return (EINVAL);
   1059  1.81.2.2     skrll 	}
   1060  1.81.2.2     skrll 
   1061  1.81.2.2     skrll 	*(int*)rnode->sysctl_data = tmp;
   1062  1.81.2.2     skrll 
   1063  1.81.2.2     skrll 	return (0);
   1064  1.81.2.2     skrll }
   1065  1.81.2.2     skrll 
   1066  1.81.2.2     skrll /*
   1067  1.81.2.2     skrll  * sysctl helper routine for the net.inet.tcp.ident and
   1068  1.81.2.2     skrll  * net.inet6.tcp6.ident nodes.  contains backwards compat code for the
   1069  1.81.2.2     skrll  * old way of looking up the ident information for ipv4 which involves
   1070  1.81.2.2     skrll  * stuffing the port/addr pairs into the mib lookup.
   1071  1.81.2.2     skrll  */
   1072  1.81.2.2     skrll static int
   1073  1.81.2.2     skrll sysctl_net_inet_tcp_ident(SYSCTLFN_ARGS)
   1074  1.81.2.2     skrll {
   1075  1.81.2.2     skrll #ifdef INET
   1076  1.81.2.2     skrll 	struct inpcb *inb;
   1077  1.81.2.2     skrll 	struct sockaddr_in *si4[2];
   1078  1.81.2.2     skrll #endif /* INET */
   1079  1.81.2.2     skrll #ifdef INET6
   1080  1.81.2.2     skrll 	struct in6pcb *in6b;
   1081  1.81.2.2     skrll 	struct sockaddr_in6 *si6[2];
   1082  1.81.2.2     skrll #endif /* INET6 */
   1083  1.81.2.2     skrll 	struct sockaddr_storage sa[2];
   1084  1.81.2.2     skrll 	struct socket *sockp;
   1085  1.81.2.2     skrll 	size_t sz;
   1086  1.81.2.2     skrll 	uid_t uid;
   1087  1.81.2.2     skrll 	int error, pf;
   1088  1.81.2.2     skrll 
   1089  1.81.2.2     skrll 	if (namelen != 4 && namelen != 0)
   1090  1.81.2.2     skrll 		return (EINVAL);
   1091  1.81.2.2     skrll 	if (name[-2] != IPPROTO_TCP)
   1092  1.81.2.2     skrll 		return (EINVAL);
   1093  1.81.2.2     skrll 	pf = name[-3];
   1094  1.81.2.2     skrll 
   1095  1.81.2.2     skrll 	/* old style lookup, ipv4 only */
   1096  1.81.2.2     skrll 	if (namelen == 4) {
   1097  1.81.2.2     skrll #ifdef INET
   1098  1.81.2.2     skrll 		struct in_addr laddr, raddr;
   1099  1.81.2.2     skrll 		u_int lport, rport;
   1100  1.81.2.2     skrll 
   1101  1.81.2.2     skrll 		if (pf != PF_INET)
   1102  1.81.2.2     skrll 			return (EPROTONOSUPPORT);
   1103  1.81.2.2     skrll 		raddr.s_addr = (uint32_t)name[0];
   1104  1.81.2.2     skrll 		rport = (u_int)name[1];
   1105  1.81.2.2     skrll 		laddr.s_addr = (uint32_t)name[2];
   1106  1.81.2.2     skrll 		lport = (u_int)name[3];
   1107  1.81.2.2     skrll 		inb = in_pcblookup_connect(&tcbtable, raddr, rport,
   1108  1.81.2.2     skrll 					   laddr, lport);
   1109  1.81.2.2     skrll 		if (inb == NULL || (sockp = inb->inp_socket) == NULL)
   1110  1.81.2.2     skrll 			return (ESRCH);
   1111  1.81.2.2     skrll 		uid = sockp->so_uid;
   1112  1.81.2.2     skrll 		if (oldp) {
   1113  1.81.2.2     skrll 			sz = MIN(sizeof(uid), *oldlenp);
   1114  1.81.2.2     skrll 			error = copyout(&uid, oldp, sz);
   1115      1.69    martin 			if (error)
   1116      1.70    martin 				return (error);
   1117      1.69    martin 		}
   1118  1.81.2.2     skrll 		*oldlenp = sizeof(uid);
   1119  1.81.2.2     skrll 		return (0);
   1120  1.81.2.2     skrll #else /* INET */
   1121  1.81.2.2     skrll 		return (EINVAL);
   1122  1.81.2.2     skrll #endif /* INET */
   1123  1.81.2.2     skrll 	}
   1124  1.81.2.2     skrll 
   1125  1.81.2.2     skrll 	if (newp == NULL || newlen != sizeof(sa))
   1126  1.81.2.2     skrll 		return (EINVAL);
   1127  1.81.2.2     skrll 	error = copyin(newp, &sa, newlen);
   1128  1.81.2.2     skrll 	if (error)
   1129  1.81.2.2     skrll 		return (error);
   1130  1.81.2.2     skrll 
   1131  1.81.2.2     skrll 	/*
   1132  1.81.2.2     skrll 	 * requested families must match
   1133  1.81.2.2     skrll 	 */
   1134  1.81.2.2     skrll 	if (pf != sa[0].ss_family || sa[0].ss_family != sa[1].ss_family)
   1135  1.81.2.2     skrll 		return (EINVAL);
   1136  1.81.2.2     skrll 
   1137  1.81.2.2     skrll 	switch (pf) {
   1138  1.81.2.2     skrll #ifdef INET
   1139  1.81.2.2     skrll 	    case PF_INET:
   1140  1.81.2.2     skrll 		si4[0] = (struct sockaddr_in*)&sa[0];
   1141  1.81.2.2     skrll 		si4[1] = (struct sockaddr_in*)&sa[1];
   1142  1.81.2.2     skrll 		if (si4[0]->sin_len != sizeof(*si4[0]) ||
   1143  1.81.2.2     skrll 		    si4[0]->sin_len != si4[1]->sin_len)
   1144  1.81.2.2     skrll 			return (EINVAL);
   1145  1.81.2.2     skrll 		inb = in_pcblookup_connect(&tcbtable,
   1146  1.81.2.2     skrll 		    si4[0]->sin_addr, si4[0]->sin_port,
   1147  1.81.2.2     skrll 		    si4[1]->sin_addr, si4[1]->sin_port);
   1148  1.81.2.2     skrll 		if (inb == NULL || (sockp = inb->inp_socket) == NULL)
   1149  1.81.2.2     skrll 			return (ESRCH);
   1150  1.81.2.2     skrll 		break;
   1151  1.81.2.2     skrll #endif /* INET */
   1152  1.81.2.2     skrll #ifdef INET6
   1153  1.81.2.2     skrll 	    case PF_INET6:
   1154  1.81.2.2     skrll 		si6[0] = (struct sockaddr_in6*)&sa[0];
   1155  1.81.2.2     skrll 		si6[1] = (struct sockaddr_in6*)&sa[1];
   1156  1.81.2.2     skrll 		if (si6[0]->sin6_len != sizeof(*si6[0]) ||
   1157  1.81.2.2     skrll 		    si6[0]->sin6_len != si6[1]->sin6_len)
   1158  1.81.2.2     skrll 			return (EINVAL);
   1159  1.81.2.2     skrll 		in6b = in6_pcblookup_connect(&tcbtable,
   1160  1.81.2.2     skrll 		    &si6[0]->sin6_addr, si6[0]->sin6_port,
   1161  1.81.2.2     skrll 		    &si6[1]->sin6_addr, si6[1]->sin6_port, 0);
   1162  1.81.2.2     skrll 		if (in6b == NULL || (sockp = in6b->in6p_socket) == NULL)
   1163  1.81.2.2     skrll 			return (ESRCH);
   1164  1.81.2.2     skrll 		break;
   1165  1.81.2.2     skrll #endif /* INET6 */
   1166  1.81.2.2     skrll 	    default:
   1167  1.81.2.2     skrll 		return (EPROTONOSUPPORT);
   1168      1.39        tv 	}
   1169  1.81.2.4     skrll 	*oldlenp = sizeof(uid);
   1170      1.38     mouse 
   1171  1.81.2.2     skrll 	uid = sockp->so_uid;
   1172  1.81.2.2     skrll 	if (oldp) {
   1173  1.81.2.2     skrll 		sz = MIN(sizeof(uid), *oldlenp);
   1174  1.81.2.2     skrll 		error = copyout(&uid, oldp, sz);
   1175  1.81.2.2     skrll 		if (error)
   1176  1.81.2.2     skrll 			return (error);
   1177  1.81.2.2     skrll 	}
   1178  1.81.2.2     skrll 	*oldlenp = sizeof(uid);
   1179  1.81.2.2     skrll 
   1180  1.81.2.2     skrll 	return (0);
   1181      1.76  christos }
   1182      1.76  christos 
   1183  1.81.2.2     skrll /*
   1184  1.81.2.2     skrll  * this (second stage) setup routine is a replacement for tcp_sysctl()
   1185  1.81.2.2     skrll  * (which is currently used for ipv4 and ipv6)
   1186  1.81.2.2     skrll  */
   1187  1.81.2.2     skrll static void
   1188  1.81.2.2     skrll sysctl_net_inet_tcp_setup2(struct sysctllog **clog, int pf, const char *pfname,
   1189  1.81.2.2     skrll 			   const char *tcpname)
   1190  1.81.2.2     skrll {
   1191      1.76  christos 
   1192  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1193  1.81.2.2     skrll 		       CTLFLAG_PERMANENT,
   1194  1.81.2.2     skrll 		       CTLTYPE_NODE, "net", NULL,
   1195  1.81.2.2     skrll 		       NULL, 0, NULL, 0,
   1196  1.81.2.2     skrll 		       CTL_NET, CTL_EOL);
   1197  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1198  1.81.2.2     skrll 		       CTLFLAG_PERMANENT,
   1199  1.81.2.2     skrll 		       CTLTYPE_NODE, pfname, NULL,
   1200  1.81.2.2     skrll 		       NULL, 0, NULL, 0,
   1201  1.81.2.2     skrll 		       CTL_NET, pf, CTL_EOL);
   1202  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1203  1.81.2.2     skrll 		       CTLFLAG_PERMANENT,
   1204  1.81.2.2     skrll 		       CTLTYPE_NODE, tcpname,
   1205  1.81.2.2     skrll 		       SYSCTL_DESCR("TCP related settings"),
   1206  1.81.2.2     skrll 		       NULL, 0, NULL, 0,
   1207  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, CTL_EOL);
   1208  1.81.2.2     skrll 
   1209  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1210  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1211  1.81.2.2     skrll 		       CTLTYPE_INT, "rfc1323",
   1212  1.81.2.2     skrll 		       SYSCTL_DESCR("Enable RFC1323 TCP extensions"),
   1213  1.81.2.2     skrll 		       NULL, 0, &tcp_do_rfc1323, 0,
   1214  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_RFC1323, CTL_EOL);
   1215  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1216  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1217  1.81.2.2     skrll 		       CTLTYPE_INT, "sendspace",
   1218  1.81.2.2     skrll 		       SYSCTL_DESCR("Default TCP send buffer size"),
   1219  1.81.2.2     skrll 		       NULL, 0, &tcp_sendspace, 0,
   1220  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_SENDSPACE, CTL_EOL);
   1221  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1222  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1223  1.81.2.2     skrll 		       CTLTYPE_INT, "recvspace",
   1224  1.81.2.2     skrll 		       SYSCTL_DESCR("Default TCP receive buffer size"),
   1225  1.81.2.2     skrll 		       NULL, 0, &tcp_recvspace, 0,
   1226  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_RECVSPACE, CTL_EOL);
   1227  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1228  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1229  1.81.2.2     skrll 		       CTLTYPE_INT, "mssdflt",
   1230  1.81.2.2     skrll 		       SYSCTL_DESCR("Default maximum segment size"),
   1231  1.81.2.2     skrll 		       sysctl_net_inet_tcp_mssdflt, 0, &tcp_mssdflt, 0,
   1232  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_MSSDFLT, CTL_EOL);
   1233  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1234  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1235  1.81.2.2     skrll 		       CTLTYPE_INT, "syn_cache_limit",
   1236  1.81.2.2     skrll 		       SYSCTL_DESCR("Maximum number of entries in the TCP "
   1237  1.81.2.2     skrll 				    "compressed state engine"),
   1238  1.81.2.2     skrll 		       NULL, 0, &tcp_syn_cache_limit, 0,
   1239  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_SYN_CACHE_LIMIT,
   1240  1.81.2.2     skrll 		       CTL_EOL);
   1241  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1242  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1243  1.81.2.2     skrll 		       CTLTYPE_INT, "syn_bucket_limit",
   1244  1.81.2.2     skrll 		       SYSCTL_DESCR("Maximum number of entries per hash "
   1245  1.81.2.2     skrll 				    "bucket in the TCP compressed state "
   1246  1.81.2.2     skrll 				    "engine"),
   1247  1.81.2.2     skrll 		       NULL, 0, &tcp_syn_bucket_limit, 0,
   1248  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_SYN_BUCKET_LIMIT,
   1249  1.81.2.2     skrll 		       CTL_EOL);
   1250  1.81.2.2     skrll #if 0 /* obsoleted */
   1251  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1252  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1253  1.81.2.2     skrll 		       CTLTYPE_INT, "syn_cache_interval",
   1254  1.81.2.2     skrll 		       SYSCTL_DESCR("TCP compressed state engine's timer interval"),
   1255  1.81.2.2     skrll 		       NULL, 0, &tcp_syn_cache_interval, 0,
   1256  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_SYN_CACHE_INTER,
   1257  1.81.2.2     skrll 		       CTL_EOL);
   1258  1.81.2.2     skrll #endif
   1259  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1260  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1261  1.81.2.2     skrll 		       CTLTYPE_INT, "init_win",
   1262  1.81.2.2     skrll 		       SYSCTL_DESCR("Initial TCP congestion window"),
   1263  1.81.2.2     skrll 		       NULL, 0, &tcp_init_win, 0,
   1264  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_INIT_WIN, CTL_EOL);
   1265  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1266  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1267  1.81.2.2     skrll 		       CTLTYPE_INT, "mss_ifmtu",
   1268  1.81.2.2     skrll 		       SYSCTL_DESCR("Use interface MTU for calculating MSS"),
   1269  1.81.2.2     skrll 		       NULL, 0, &tcp_mss_ifmtu, 0,
   1270  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_MSS_IFMTU, CTL_EOL);
   1271  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1272  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1273  1.81.2.2     skrll 		       CTLTYPE_INT, "sack",
   1274  1.81.2.2     skrll 		       SYSCTL_DESCR("Enable RFC2018 Selection ACKnowledgement "
   1275  1.81.2.2     skrll 				    "(not implemented)"),
   1276  1.81.2.2     skrll 		       NULL, 0, &tcp_do_sack, 0,
   1277  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_SACK, CTL_EOL);
   1278  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1279  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1280  1.81.2.2     skrll 		       CTLTYPE_INT, "win_scale",
   1281  1.81.2.2     skrll 		       SYSCTL_DESCR("Use RFC1323 window scale options"),
   1282  1.81.2.2     skrll 		       NULL, 0, &tcp_do_win_scale, 0,
   1283  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_WSCALE, CTL_EOL);
   1284  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1285  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1286  1.81.2.2     skrll 		       CTLTYPE_INT, "timestamps",
   1287  1.81.2.2     skrll 		       SYSCTL_DESCR("Use RFC1323 time stamp options"),
   1288  1.81.2.2     skrll 		       NULL, 0, &tcp_do_timestamps, 0,
   1289  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_TSTAMP, CTL_EOL);
   1290  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1291  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1292  1.81.2.2     skrll 		       CTLTYPE_INT, "compat_42",
   1293  1.81.2.2     skrll 		       SYSCTL_DESCR("Enable workarounds for 4.2BSD TCP bugs"),
   1294  1.81.2.2     skrll 		       NULL, 0, &tcp_compat_42, 0,
   1295  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_COMPAT_42, CTL_EOL);
   1296  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1297  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1298  1.81.2.2     skrll 		       CTLTYPE_INT, "cwm",
   1299  1.81.2.2     skrll 		       SYSCTL_DESCR("Hughes/Touch/Heidemann Congestion Window "
   1300  1.81.2.2     skrll 				    "Monitoring"),
   1301  1.81.2.2     skrll 		       NULL, 0, &tcp_cwm, 0,
   1302  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_CWM, CTL_EOL);
   1303  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1304  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1305  1.81.2.2     skrll 		       CTLTYPE_INT, "cwm_burstsize",
   1306  1.81.2.2     skrll 		       SYSCTL_DESCR("Congestion Window Monitoring allowed "
   1307  1.81.2.2     skrll 				    "burst count in packets"),
   1308  1.81.2.2     skrll 		       NULL, 0, &tcp_cwm_burstsize, 0,
   1309  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_CWM_BURSTSIZE,
   1310  1.81.2.2     skrll 		       CTL_EOL);
   1311  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1312  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1313  1.81.2.2     skrll 		       CTLTYPE_INT, "ack_on_push",
   1314  1.81.2.2     skrll 		       SYSCTL_DESCR("Immediately return ACK when PSH is "
   1315  1.81.2.2     skrll 				    "received"),
   1316  1.81.2.2     skrll 		       NULL, 0, &tcp_ack_on_push, 0,
   1317  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_ACK_ON_PUSH, CTL_EOL);
   1318  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1319  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1320  1.81.2.2     skrll 		       CTLTYPE_INT, "keepidle",
   1321  1.81.2.2     skrll 		       SYSCTL_DESCR("Allowed connection idle ticks before a "
   1322  1.81.2.2     skrll 				    "keepalive probe is sent"),
   1323  1.81.2.2     skrll 		       NULL, 0, &tcp_keepidle, 0,
   1324  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_KEEPIDLE, CTL_EOL);
   1325  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1326  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1327  1.81.2.2     skrll 		       CTLTYPE_INT, "keepintvl",
   1328  1.81.2.2     skrll 		       SYSCTL_DESCR("Ticks before next keepalive probe is sent"),
   1329  1.81.2.2     skrll 		       NULL, 0, &tcp_keepintvl, 0,
   1330  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_KEEPINTVL, CTL_EOL);
   1331  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1332  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1333  1.81.2.2     skrll 		       CTLTYPE_INT, "keepcnt",
   1334  1.81.2.2     skrll 		       SYSCTL_DESCR("Number of keepalive probes to send"),
   1335  1.81.2.2     skrll 		       NULL, 0, &tcp_keepcnt, 0,
   1336  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_KEEPCNT, CTL_EOL);
   1337  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1338  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
   1339  1.81.2.2     skrll 		       CTLTYPE_INT, "slowhz",
   1340  1.81.2.2     skrll 		       SYSCTL_DESCR("Keepalive ticks per second"),
   1341  1.81.2.2     skrll 		       NULL, PR_SLOWHZ, NULL, 0,
   1342  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_SLOWHZ, CTL_EOL);
   1343  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1344  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1345  1.81.2.2     skrll 		       CTLTYPE_INT, "newreno",
   1346  1.81.2.2     skrll 		       SYSCTL_DESCR("NewReno congestion control algorithm"),
   1347  1.81.2.2     skrll 		       NULL, 0, &tcp_do_newreno, 0,
   1348  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_NEWRENO, CTL_EOL);
   1349  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1350  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1351  1.81.2.2     skrll 		       CTLTYPE_INT, "log_refused",
   1352  1.81.2.2     skrll 		       SYSCTL_DESCR("Log refused TCP connections"),
   1353  1.81.2.2     skrll 		       NULL, 0, &tcp_log_refused, 0,
   1354  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_LOG_REFUSED, CTL_EOL);
   1355  1.81.2.2     skrll #if 0 /* obsoleted */
   1356  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1357  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1358  1.81.2.2     skrll 		       CTLTYPE_INT, "rstratelimit", NULL,
   1359  1.81.2.2     skrll 		       NULL, 0, &tcp_rst_ratelim, 0,
   1360  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_RSTRATELIMIT, CTL_EOL);
   1361  1.81.2.2     skrll #endif
   1362  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1363  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1364  1.81.2.2     skrll 		       CTLTYPE_INT, "rstppslimit",
   1365  1.81.2.2     skrll 		       SYSCTL_DESCR("Maximum number of RST packets to send "
   1366  1.81.2.2     skrll 				    "per second"),
   1367  1.81.2.2     skrll 		       NULL, 0, &tcp_rst_ppslim, 0,
   1368  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_RSTPPSLIMIT, CTL_EOL);
   1369  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1370  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1371  1.81.2.2     skrll 		       CTLTYPE_INT, "delack_ticks",
   1372  1.81.2.2     skrll 		       SYSCTL_DESCR("Number of ticks to delay sending an ACK"),
   1373  1.81.2.2     skrll 		       NULL, 0, &tcp_delack_ticks, 0,
   1374  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_DELACK_TICKS, CTL_EOL);
   1375  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1376  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1377  1.81.2.2     skrll 		       CTLTYPE_INT, "init_win_local",
   1378  1.81.2.2     skrll 		       SYSCTL_DESCR("Initial TCP window size (in segments)"),
   1379  1.81.2.2     skrll 		       NULL, 0, &tcp_init_win_local, 0,
   1380  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_INIT_WIN_LOCAL,
   1381  1.81.2.2     skrll 		       CTL_EOL);
   1382  1.81.2.2     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1383  1.81.2.2     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1384  1.81.2.2     skrll 		       CTLTYPE_STRUCT, "ident",
   1385  1.81.2.2     skrll 		       SYSCTL_DESCR("RFC1413 Identification Protocol lookups"),
   1386  1.81.2.2     skrll 		       sysctl_net_inet_tcp_ident, 0, NULL, sizeof(uid_t),
   1387  1.81.2.2     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_IDENT, CTL_EOL);
   1388  1.81.2.5     skrll 	sysctl_createv(clog, 0, NULL, NULL,
   1389  1.81.2.5     skrll 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   1390  1.81.2.5     skrll 		       CTLTYPE_INT, "do_loopback_cksum",
   1391  1.81.2.5     skrll 		       SYSCTL_DESCR("Perform TCP checksum on loopback"),
   1392  1.81.2.5     skrll 		       NULL, 0, &tcp_do_loopback_cksum, 0,
   1393  1.81.2.5     skrll 		       CTL_NET, pf, IPPROTO_TCP, TCPCTL_LOOPBACKCKSUM,
   1394  1.81.2.5     skrll 		       CTL_EOL);
   1395  1.81.2.2     skrll }
   1396  1.81.2.2     skrll 
   1397  1.81.2.2     skrll /*
   1398  1.81.2.2     skrll  * Sysctl for tcp variables.
   1399  1.81.2.2     skrll  */
   1400  1.81.2.2     skrll #ifdef INET
   1401  1.81.2.2     skrll SYSCTL_SETUP(sysctl_net_inet_tcp_setup, "sysctl net.inet.tcp subtree setup")
   1402      1.76  christos {
   1403      1.76  christos 
   1404  1.81.2.2     skrll 	sysctl_net_inet_tcp_setup2(clog, PF_INET, "inet", "tcp");
   1405  1.81.2.2     skrll }
   1406  1.81.2.2     skrll #endif /* INET */
   1407      1.76  christos 
   1408  1.81.2.2     skrll #ifdef INET6
   1409  1.81.2.2     skrll SYSCTL_SETUP(sysctl_net_inet6_tcp6_setup, "sysctl net.inet6.tcp6 subtree setup")
   1410  1.81.2.2     skrll {
   1411      1.76  christos 
   1412  1.81.2.2     skrll 	sysctl_net_inet_tcp_setup2(clog, PF_INET6, "inet6", "tcp6");
   1413       1.1       cgd }
   1414  1.81.2.2     skrll #endif /* INET6 */
   1415  1.81.2.2     skrll 
   1416