ea861f0183
due to massive changes in KAME side. - IPv6 output goes through nd6_output - faith can capture IPv4 packets as well - you can run IPv4-to-IPv6 translator using heavily modified DNS servers - per-interface statistics (required for IPv6 MIB) - interface autoconfig is revisited - udp input handling has a big change for mapped address support. - introduce in4_cksum() for non-overwriting checksumming - introduce m_pulldown() - neighbor discovery cleanups/improvements - netinet/in.h strictly conforms to RFC2553 (no extra defs visible to userland) - IFA_STATS is fixed a bit (not tested) - and more more more. TODO: - cleanup os-independency #ifdef - avoid rcvif dual use (for IPsec) to help ifdetach (sorry for jumbo commit, I can't separate this any more...)
905 lines
22 KiB
C
905 lines
22 KiB
C
/* $NetBSD: tcp_usrreq.c,v 1.43 1999/12/13 15:17:21 itojun Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Jason R. Thorpe and Kevin M. Lahey of the Numerical Aerospace Simulation
|
|
* Facility, NASA Ames Research Center.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1988, 1993, 1995
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)tcp_usrreq.c 8.5 (Berkeley) 6/21/95
|
|
*/
|
|
|
|
#include "opt_inet.h"
|
|
#include "opt_ipsec.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/ucred.h>
|
|
#include <sys/domain.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/route.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/in_pcb.h>
|
|
#include <netinet/ip_var.h>
|
|
|
|
#ifdef INET6
|
|
#ifndef INET
|
|
#include <netinet/in.h>
|
|
#endif
|
|
#include <netinet/ip6.h>
|
|
#include <netinet6/in6_pcb.h>
|
|
#include <netinet6/ip6_var.h>
|
|
#endif
|
|
|
|
#include <netinet/tcp.h>
|
|
#include <netinet/tcp_fsm.h>
|
|
#include <netinet/tcp_seq.h>
|
|
#include <netinet/tcp_timer.h>
|
|
#include <netinet/tcp_var.h>
|
|
#include <netinet/tcpip.h>
|
|
#include <netinet/tcp_debug.h>
|
|
|
|
#include "opt_tcp_recvspace.h"
|
|
#include "opt_tcp_sendspace.h"
|
|
|
|
#ifdef IPSEC
|
|
#include <netinet6/ipsec.h>
|
|
#endif /*IPSEC*/
|
|
|
|
/*
|
|
* TCP protocol interface to socket abstraction.
|
|
*/
|
|
extern char *tcpstates[];
|
|
|
|
/*
|
|
* Process a TCP user request for TCP tb. If this is a send request
|
|
* then m is the mbuf chain of send data. If this is a timer expiration
|
|
* (called from the software clock routine), then timertype tells which timer.
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
tcp_usrreq(so, req, m, nam, control, p)
|
|
struct socket *so;
|
|
int req;
|
|
struct mbuf *m, *nam, *control;
|
|
struct proc *p;
|
|
{
|
|
register struct inpcb *inp;
|
|
#ifdef INET6
|
|
register struct in6pcb *in6p;
|
|
#endif
|
|
register struct tcpcb *tp = NULL;
|
|
int s;
|
|
int error = 0;
|
|
int ostate;
|
|
int family; /* family of the socket */
|
|
|
|
family = so->so_proto->pr_domain->dom_family;
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|
|
|
if (req == PRU_CONTROL) {
|
|
switch (family) {
|
|
case PF_INET:
|
|
return (in_control(so, (long)m, (caddr_t)nam,
|
|
(struct ifnet *)control, p));
|
|
#ifdef INET6
|
|
case PF_INET6:
|
|
return (in6_control(so, (long)m, (caddr_t)nam,
|
|
(struct ifnet *)control, p));
|
|
#endif
|
|
default:
|
|
return EAFNOSUPPORT;
|
|
}
|
|
}
|
|
|
|
s = splsoftnet();
|
|
switch (family) {
|
|
case PF_INET:
|
|
inp = sotoinpcb(so);
|
|
#ifdef INET6
|
|
in6p = NULL;
|
|
#endif
|
|
break;
|
|
#ifdef INET6
|
|
case PF_INET6:
|
|
inp = NULL;
|
|
in6p = sotoin6pcb(so);
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|
break;
|
|
#endif
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default:
|
|
splx(s);
|
|
return EAFNOSUPPORT;
|
|
}
|
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|
|
#ifdef DIAGNOSTIC
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|
if (req != PRU_SEND && req != PRU_SENDOOB && control)
|
|
panic("tcp_usrreq: unexpected control mbuf");
|
|
#endif
|
|
/*
|
|
* When a TCP is attached to a socket, then there will be
|
|
* a (struct inpcb) pointed at by the socket, and this
|
|
* structure will point at a subsidary (struct tcpcb).
|
|
*/
|
|
#ifndef INET6
|
|
if (inp == 0 && req != PRU_ATTACH)
|
|
#else
|
|
if ((inp == 0 && in6p == 0) && req != PRU_ATTACH)
|
|
#endif
|
|
{
|
|
error = EINVAL;
|
|
goto release;
|
|
}
|
|
if (inp) {
|
|
tp = intotcpcb(inp);
|
|
/* WHAT IF TP IS 0? */
|
|
#ifdef KPROF
|
|
tcp_acounts[tp->t_state][req]++;
|
|
#endif
|
|
ostate = tp->t_state;
|
|
}
|
|
#ifdef INET6
|
|
else if (in6p) {
|
|
tp = in6totcpcb(in6p);
|
|
/* WHAT IF TP IS 0? */
|
|
#ifdef KPROF
|
|
tcp_acounts[tp->t_state][req]++;
|
|
#endif
|
|
ostate = tp->t_state;
|
|
}
|
|
#endif
|
|
else
|
|
ostate = 0;
|
|
|
|
switch (req) {
|
|
|
|
/*
|
|
* TCP attaches to socket via PRU_ATTACH, reserving space,
|
|
* and an internet control block.
|
|
*/
|
|
case PRU_ATTACH:
|
|
#ifndef INET6
|
|
if (inp != 0)
|
|
#else
|
|
if (inp != 0 || in6p != 0)
|
|
#endif
|
|
{
|
|
error = EISCONN;
|
|
break;
|
|
}
|
|
error = tcp_attach(so);
|
|
if (error)
|
|
break;
|
|
if ((so->so_options & SO_LINGER) && so->so_linger == 0)
|
|
so->so_linger = TCP_LINGERTIME;
|
|
tp = sototcpcb(so);
|
|
break;
|
|
|
|
/*
|
|
* PRU_DETACH detaches the TCP protocol from the socket.
|
|
*/
|
|
case PRU_DETACH:
|
|
tp = tcp_disconnect(tp);
|
|
break;
|
|
|
|
/*
|
|
* Give the socket an address.
|
|
*/
|
|
case PRU_BIND:
|
|
switch (family) {
|
|
case PF_INET:
|
|
error = in_pcbbind(inp, nam, p);
|
|
break;
|
|
#ifdef INET6
|
|
case PF_INET6:
|
|
error = in6_pcbbind(in6p, nam /*, p*/ );
|
|
/* mapped addr case */
|
|
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr))
|
|
tp->t_family = AF_INET;
|
|
break;
|
|
#endif
|
|
}
|
|
break;
|
|
|
|
/*
|
|
* Prepare to accept connections.
|
|
*/
|
|
case PRU_LISTEN:
|
|
if (inp && inp->inp_lport == 0) {
|
|
error = in_pcbbind(inp, (struct mbuf *)0,
|
|
(struct proc *)0);
|
|
if (error)
|
|
break;
|
|
}
|
|
#ifdef INET6
|
|
else if (in6p && in6p->in6p_lport == 0) {
|
|
error = in6_pcbbind(in6p, (struct mbuf *)0 /*,
|
|
(struct proc *)0 */ );
|
|
if (error)
|
|
break;
|
|
}
|
|
#endif
|
|
tp->t_state = TCPS_LISTEN;
|
|
break;
|
|
|
|
/*
|
|
* Initiate connection to peer.
|
|
* Create a template for use in transmissions on this connection.
|
|
* Enter SYN_SENT state, and mark socket as connecting.
|
|
* Start keep-alive timer, and seed output sequence space.
|
|
* Send initial segment on connection.
|
|
*/
|
|
case PRU_CONNECT:
|
|
if (inp) {
|
|
if (inp->inp_lport == 0) {
|
|
error = in_pcbbind(inp, (struct mbuf *)0,
|
|
(struct proc *)0);
|
|
if (error)
|
|
break;
|
|
}
|
|
error = in_pcbconnect(inp, nam);
|
|
}
|
|
#ifdef INET6
|
|
else if (in6p) {
|
|
if (in6p->in6p_lport == 0) {
|
|
error = in6_pcbbind(in6p, (struct mbuf *)0 /*,
|
|
(struct proc *)0 */ );
|
|
if (error)
|
|
break;
|
|
}
|
|
error = in6_pcbconnect(in6p, nam);
|
|
/* mapped addr case */
|
|
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr))
|
|
tp->t_family = AF_INET;
|
|
}
|
|
#endif
|
|
if (error)
|
|
break;
|
|
tp->t_template = tcp_template(tp);
|
|
if (tp->t_template == 0) {
|
|
if (inp)
|
|
in_pcbdisconnect(inp);
|
|
#ifdef INET6
|
|
else if (in6p)
|
|
in6_pcbdisconnect(in6p);
|
|
#endif
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
/* Compute window scaling to request. */
|
|
while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
|
|
(TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
|
|
tp->request_r_scale++;
|
|
soisconnecting(so);
|
|
tcpstat.tcps_connattempt++;
|
|
tp->t_state = TCPS_SYN_SENT;
|
|
TCP_TIMER_ARM(tp, TCPT_KEEP, TCPTV_KEEP_INIT);
|
|
tp->iss = tcp_new_iss(tp, sizeof(struct tcpcb), 0);
|
|
tcp_sendseqinit(tp);
|
|
error = tcp_output(tp);
|
|
break;
|
|
|
|
/*
|
|
* Create a TCP connection between two sockets.
|
|
*/
|
|
case PRU_CONNECT2:
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
|
|
/*
|
|
* Initiate disconnect from peer.
|
|
* If connection never passed embryonic stage, just drop;
|
|
* else if don't need to let data drain, then can just drop anyways,
|
|
* else have to begin TCP shutdown process: mark socket disconnecting,
|
|
* drain unread data, state switch to reflect user close, and
|
|
* send segment (e.g. FIN) to peer. Socket will be really disconnected
|
|
* when peer sends FIN and acks ours.
|
|
*
|
|
* SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
|
|
*/
|
|
case PRU_DISCONNECT:
|
|
tp = tcp_disconnect(tp);
|
|
break;
|
|
|
|
/*
|
|
* Accept a connection. Essentially all the work is
|
|
* done at higher levels; just return the address
|
|
* of the peer, storing through addr.
|
|
*/
|
|
case PRU_ACCEPT:
|
|
if (inp)
|
|
in_setpeeraddr(inp, nam);
|
|
#ifdef INET6
|
|
else if (in6p)
|
|
in6_setpeeraddr(in6p, nam);
|
|
#endif
|
|
break;
|
|
|
|
/*
|
|
* Mark the connection as being incapable of further output.
|
|
*/
|
|
case PRU_SHUTDOWN:
|
|
socantsendmore(so);
|
|
tp = tcp_usrclosed(tp);
|
|
if (tp)
|
|
error = tcp_output(tp);
|
|
break;
|
|
|
|
/*
|
|
* After a receive, possibly send window update to peer.
|
|
*/
|
|
case PRU_RCVD:
|
|
(void) tcp_output(tp);
|
|
break;
|
|
|
|
/*
|
|
* Do a send by putting data in output queue and updating urgent
|
|
* marker if URG set. Possibly send more data.
|
|
*/
|
|
case PRU_SEND:
|
|
if (control && control->m_len) {
|
|
m_freem(control);
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
sbappend(&so->so_snd, m);
|
|
error = tcp_output(tp);
|
|
break;
|
|
|
|
/*
|
|
* Abort the TCP.
|
|
*/
|
|
case PRU_ABORT:
|
|
tp = tcp_drop(tp, ECONNABORTED);
|
|
break;
|
|
|
|
case PRU_SENSE:
|
|
/*
|
|
* stat: don't bother with a blocksize.
|
|
*/
|
|
splx(s);
|
|
return (0);
|
|
|
|
case PRU_RCVOOB:
|
|
if (control && control->m_len) {
|
|
m_freem(control);
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if ((so->so_oobmark == 0 &&
|
|
(so->so_state & SS_RCVATMARK) == 0) ||
|
|
so->so_options & SO_OOBINLINE ||
|
|
tp->t_oobflags & TCPOOB_HADDATA) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
|
|
error = EWOULDBLOCK;
|
|
break;
|
|
}
|
|
m->m_len = 1;
|
|
*mtod(m, caddr_t) = tp->t_iobc;
|
|
if (((long)nam & MSG_PEEK) == 0)
|
|
tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
|
|
break;
|
|
|
|
case PRU_SENDOOB:
|
|
if (sbspace(&so->so_snd) < -512) {
|
|
m_freem(m);
|
|
error = ENOBUFS;
|
|
break;
|
|
}
|
|
/*
|
|
* According to RFC961 (Assigned Protocols),
|
|
* the urgent pointer points to the last octet
|
|
* of urgent data. We continue, however,
|
|
* to consider it to indicate the first octet
|
|
* of data past the urgent section.
|
|
* Otherwise, snd_up should be one lower.
|
|
*/
|
|
sbappend(&so->so_snd, m);
|
|
tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
|
|
tp->t_force = 1;
|
|
error = tcp_output(tp);
|
|
tp->t_force = 0;
|
|
break;
|
|
|
|
case PRU_SOCKADDR:
|
|
if (inp)
|
|
in_setsockaddr(inp, nam);
|
|
#ifdef INET6
|
|
else if (in6p)
|
|
in6_setsockaddr(in6p, nam);
|
|
#endif
|
|
break;
|
|
|
|
case PRU_PEERADDR:
|
|
if (inp)
|
|
in_setpeeraddr(inp, nam);
|
|
#ifdef INET6
|
|
else if (in6p)
|
|
in6_setpeeraddr(in6p, nam);
|
|
#endif
|
|
break;
|
|
|
|
/*
|
|
* TCP slow timer went off; going through this
|
|
* routine for tracing's sake.
|
|
*/
|
|
case PRU_SLOWTIMO:
|
|
tp = tcp_timers(tp, (long)nam);
|
|
req |= (long)nam << 8; /* for debug's sake */
|
|
break;
|
|
|
|
default:
|
|
panic("tcp_usrreq");
|
|
}
|
|
if (tp && (so->so_options & SO_DEBUG))
|
|
tcp_trace(TA_USER, ostate, tp, NULL, req);
|
|
|
|
release:
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
tcp_ctloutput(op, so, level, optname, mp)
|
|
int op;
|
|
struct socket *so;
|
|
int level, optname;
|
|
struct mbuf **mp;
|
|
{
|
|
int error = 0, s;
|
|
struct inpcb *inp;
|
|
#ifdef INET6
|
|
register struct in6pcb *in6p;
|
|
#endif
|
|
register struct tcpcb *tp;
|
|
register struct mbuf *m;
|
|
register int i;
|
|
int family; /* family of the socket */
|
|
|
|
family = so->so_proto->pr_domain->dom_family;
|
|
|
|
s = splsoftnet();
|
|
switch (family) {
|
|
case PF_INET:
|
|
inp = sotoinpcb(so);
|
|
#ifdef INET6
|
|
in6p = NULL;
|
|
#endif
|
|
break;
|
|
#ifdef INET6
|
|
case PF_INET6:
|
|
inp = NULL;
|
|
in6p = sotoin6pcb(so);
|
|
break;
|
|
#endif
|
|
default:
|
|
splx(s);
|
|
return EAFNOSUPPORT;
|
|
}
|
|
#ifndef INET6
|
|
if (inp == NULL)
|
|
#else
|
|
if (inp == NULL && in6p == NULL)
|
|
#endif
|
|
{
|
|
splx(s);
|
|
if (op == PRCO_SETOPT && *mp)
|
|
(void) m_free(*mp);
|
|
return (ECONNRESET);
|
|
}
|
|
if (level != IPPROTO_TCP) {
|
|
switch (family) {
|
|
case PF_INET:
|
|
error = ip_ctloutput(op, so, level, optname, mp);
|
|
break;
|
|
#ifdef INET6
|
|
case PF_INET6:
|
|
error = ip6_ctloutput(op, so, level, optname, mp);
|
|
break;
|
|
#endif
|
|
}
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
if (inp)
|
|
tp = intotcpcb(inp);
|
|
#ifdef INET6
|
|
else if (in6p)
|
|
tp = in6totcpcb(in6p);
|
|
#endif
|
|
else
|
|
tp = NULL;
|
|
|
|
switch (op) {
|
|
|
|
case PRCO_SETOPT:
|
|
m = *mp;
|
|
switch (optname) {
|
|
|
|
case TCP_NODELAY:
|
|
if (m == NULL || m->m_len < sizeof (int))
|
|
error = EINVAL;
|
|
else if (*mtod(m, int *))
|
|
tp->t_flags |= TF_NODELAY;
|
|
else
|
|
tp->t_flags &= ~TF_NODELAY;
|
|
break;
|
|
|
|
case TCP_MAXSEG:
|
|
if (m && (i = *mtod(m, int *)) > 0 &&
|
|
i <= tp->t_peermss)
|
|
tp->t_peermss = i; /* limit on send size */
|
|
else
|
|
error = EINVAL;
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (m)
|
|
(void) m_free(m);
|
|
break;
|
|
|
|
case PRCO_GETOPT:
|
|
*mp = m = m_get(M_WAIT, MT_SOOPTS);
|
|
m->m_len = sizeof(int);
|
|
|
|
switch (optname) {
|
|
case TCP_NODELAY:
|
|
*mtod(m, int *) = tp->t_flags & TF_NODELAY;
|
|
break;
|
|
case TCP_MAXSEG:
|
|
*mtod(m, int *) = tp->t_peermss;
|
|
break;
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef TCP_SENDSPACE
|
|
#define TCP_SENDSPACE 1024*16;
|
|
#endif
|
|
int tcp_sendspace = TCP_SENDSPACE;
|
|
#ifndef TCP_RECVSPACE
|
|
#define TCP_RECVSPACE 1024*16;
|
|
#endif
|
|
int tcp_recvspace = TCP_RECVSPACE;
|
|
|
|
/*
|
|
* Attach TCP protocol to socket, allocating
|
|
* internet protocol control block, tcp control block,
|
|
* bufer space, and entering LISTEN state if to accept connections.
|
|
*/
|
|
int
|
|
tcp_attach(so)
|
|
struct socket *so;
|
|
{
|
|
register struct tcpcb *tp;
|
|
struct inpcb *inp;
|
|
#ifdef INET6
|
|
struct in6pcb *in6p;
|
|
#endif
|
|
int error;
|
|
int family; /* family of the socket */
|
|
|
|
family = so->so_proto->pr_domain->dom_family;
|
|
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
error = soreserve(so, tcp_sendspace, tcp_recvspace);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
switch (family) {
|
|
case PF_INET:
|
|
error = in_pcballoc(so, &tcbtable);
|
|
if (error)
|
|
return (error);
|
|
inp = sotoinpcb(so);
|
|
#ifdef INET6
|
|
in6p = NULL;
|
|
#endif
|
|
break;
|
|
#ifdef INET6
|
|
case PF_INET6:
|
|
error = in6_pcballoc(so, &tcb6);
|
|
if (error)
|
|
return (error);
|
|
inp = NULL;
|
|
in6p = sotoin6pcb(so);
|
|
break;
|
|
#endif
|
|
default:
|
|
return EAFNOSUPPORT;
|
|
}
|
|
#ifdef IPSEC
|
|
if (inp) {
|
|
error = ipsec_init_policy(&inp->inp_sp);
|
|
if (error != 0) {
|
|
in_pcbdetach(inp);
|
|
return (error);
|
|
}
|
|
}
|
|
#ifdef INET6
|
|
else if (in6p) {
|
|
error = ipsec_init_policy(&in6p->in6p_sp);
|
|
if (error != 0) {
|
|
in6_pcbdetach(in6p);
|
|
return (error);
|
|
}
|
|
}
|
|
#endif
|
|
#endif /*IPSEC*/
|
|
if (inp)
|
|
tp = tcp_newtcpcb(family, (void *)inp);
|
|
#ifdef INET6
|
|
else if (in6p)
|
|
tp = tcp_newtcpcb(family, (void *)in6p);
|
|
#endif
|
|
else
|
|
tp = NULL;
|
|
|
|
if (tp == 0) {
|
|
int nofd = so->so_state & SS_NOFDREF; /* XXX */
|
|
|
|
so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
|
|
if (inp)
|
|
in_pcbdetach(inp);
|
|
#ifdef INET6
|
|
else if (in6p)
|
|
in6_pcbdetach(in6p);
|
|
#endif
|
|
so->so_state |= nofd;
|
|
return (ENOBUFS);
|
|
}
|
|
tp->t_state = TCPS_CLOSED;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initiate (or continue) disconnect.
|
|
* If embryonic state, just send reset (once).
|
|
* If in ``let data drain'' option and linger null, just drop.
|
|
* Otherwise (hard), mark socket disconnecting and drop
|
|
* current input data; switch states based on user close, and
|
|
* send segment to peer (with FIN).
|
|
*/
|
|
struct tcpcb *
|
|
tcp_disconnect(tp)
|
|
register struct tcpcb *tp;
|
|
{
|
|
struct socket *so;
|
|
|
|
if (tp->t_inpcb)
|
|
so = tp->t_inpcb->inp_socket;
|
|
#ifdef INET6
|
|
else if (tp->t_in6pcb)
|
|
so = tp->t_in6pcb->in6p_socket;
|
|
#endif
|
|
else
|
|
so = NULL;
|
|
|
|
if (TCPS_HAVEESTABLISHED(tp->t_state) == 0)
|
|
tp = tcp_close(tp);
|
|
else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
|
|
tp = tcp_drop(tp, 0);
|
|
else {
|
|
soisdisconnecting(so);
|
|
sbflush(&so->so_rcv);
|
|
tp = tcp_usrclosed(tp);
|
|
if (tp)
|
|
(void) tcp_output(tp);
|
|
}
|
|
return (tp);
|
|
}
|
|
|
|
/*
|
|
* User issued close, and wish to trail through shutdown states:
|
|
* if never received SYN, just forget it. If got a SYN from peer,
|
|
* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
|
|
* If already got a FIN from peer, then almost done; go to LAST_ACK
|
|
* state. In all other cases, have already sent FIN to peer (e.g.
|
|
* after PRU_SHUTDOWN), and just have to play tedious game waiting
|
|
* for peer to send FIN or not respond to keep-alives, etc.
|
|
* We can let the user exit from the close as soon as the FIN is acked.
|
|
*/
|
|
struct tcpcb *
|
|
tcp_usrclosed(tp)
|
|
register struct tcpcb *tp;
|
|
{
|
|
|
|
switch (tp->t_state) {
|
|
|
|
case TCPS_CLOSED:
|
|
case TCPS_LISTEN:
|
|
case TCPS_SYN_SENT:
|
|
tp->t_state = TCPS_CLOSED;
|
|
tp = tcp_close(tp);
|
|
break;
|
|
|
|
case TCPS_SYN_RECEIVED:
|
|
case TCPS_ESTABLISHED:
|
|
tp->t_state = TCPS_FIN_WAIT_1;
|
|
break;
|
|
|
|
case TCPS_CLOSE_WAIT:
|
|
tp->t_state = TCPS_LAST_ACK;
|
|
break;
|
|
}
|
|
if (tp && tp->t_state >= TCPS_FIN_WAIT_2) {
|
|
struct socket *so;
|
|
if (tp->t_inpcb)
|
|
so = tp->t_inpcb->inp_socket;
|
|
#ifdef INET6
|
|
else if (tp->t_in6pcb)
|
|
so = tp->t_in6pcb->in6p_socket;
|
|
#endif
|
|
else
|
|
so = NULL;
|
|
soisdisconnected(so);
|
|
/*
|
|
* If we are in FIN_WAIT_2, we arrived here because the
|
|
* application did a shutdown of the send side. Like the
|
|
* case of a transition from FIN_WAIT_1 to FIN_WAIT_2 after
|
|
* a full close, we start a timer to make sure sockets are
|
|
* not left in FIN_WAIT_2 forever.
|
|
*/
|
|
if ((tp->t_state == TCPS_FIN_WAIT_2) && (tcp_maxidle > 0))
|
|
TCP_TIMER_ARM(tp, TCPT_2MSL, tcp_maxidle);
|
|
}
|
|
return (tp);
|
|
}
|
|
|
|
static struct {
|
|
unsigned int valid : 1;
|
|
unsigned int rdonly : 1;
|
|
int *var;
|
|
int val;
|
|
} tcp_ctlvars[] = TCPCTL_VARIABLES;
|
|
|
|
/*
|
|
* Sysctl for tcp variables.
|
|
*/
|
|
int
|
|
tcp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
|
|
int *name;
|
|
u_int namelen;
|
|
void *oldp;
|
|
size_t *oldlenp;
|
|
void *newp;
|
|
size_t newlen;
|
|
{
|
|
/* All sysctl names at this level are terminal. */
|
|
if (namelen != 1)
|
|
return (ENOTDIR);
|
|
|
|
if (name[0] < sizeof(tcp_ctlvars)/sizeof(tcp_ctlvars[0])
|
|
&& tcp_ctlvars[name[0]].valid) {
|
|
if (tcp_ctlvars[name[0]].rdonly)
|
|
return (sysctl_rdint(oldp, oldlenp, newp,
|
|
tcp_ctlvars[name[0]].val));
|
|
else
|
|
return (sysctl_int(oldp, oldlenp, newp, newlen,
|
|
tcp_ctlvars[name[0]].var));
|
|
}
|
|
|
|
return (ENOPROTOOPT);
|
|
}
|