5200e00e72
in_pcbconnect() called in_pcbconnect_setup(). This version performs all of the functions of in_pcbconnect() except for the final committing of changes to the PCB. In the case of an EADDRINUSE error it can also provide to the caller the PCB of the duplicate connection, avoiding an extra in_pcblookup_hash() lookup in tcp_connect(). This change will allow the "temporary connect" hack in udp_output() to be removed and is part of the preparation for adding the IP_SENDSRCADDR control message. Discussed on: -net Approved by: re
1276 lines
30 KiB
C
1276 lines
30 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1988, 1993
|
|
* 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
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|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
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|
* 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
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|
* 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)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94
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* $FreeBSD$
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*/
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|
|
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#include "opt_ipsec.h"
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|
#include "opt_inet6.h"
|
|
#include "opt_tcpdebug.h"
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|
|
|
#include <sys/param.h>
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|
#include <sys/systm.h>
|
|
#include <sys/malloc.h>
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|
#include <sys/kernel.h>
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|
#include <sys/sysctl.h>
|
|
#include <sys/mbuf.h>
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|
#ifdef INET6
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|
#include <sys/domain.h>
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|
#endif /* INET6 */
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|
#include <sys/socket.h>
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|
#include <sys/socketvar.h>
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|
#include <sys/protosw.h>
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|
#include <sys/proc.h>
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|
#include <sys/jail.h>
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|
|
|
#include <net/if.h>
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|
#include <net/route.h>
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|
|
|
#include <netinet/in.h>
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|
#include <netinet/in_systm.h>
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|
#ifdef INET6
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|
#include <netinet/ip6.h>
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|
#endif
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|
#include <netinet/in_pcb.h>
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|
#ifdef INET6
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|
#include <netinet6/in6_pcb.h>
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|
#endif
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|
#include <netinet/in_var.h>
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|
#include <netinet/ip_var.h>
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|
#ifdef INET6
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|
#include <netinet6/ip6_var.h>
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|
#endif
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|
#include <netinet/tcp.h>
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|
#include <netinet/tcp_fsm.h>
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|
#include <netinet/tcp_seq.h>
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|
#include <netinet/tcp_timer.h>
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|
#include <netinet/tcp_var.h>
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|
#include <netinet/tcpip.h>
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|
#ifdef TCPDEBUG
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|
#include <netinet/tcp_debug.h>
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|
#endif
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|
|
|
#ifdef IPSEC
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|
#include <netinet6/ipsec.h>
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|
#endif /*IPSEC*/
|
|
|
|
/*
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|
* TCP protocol interface to socket abstraction.
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|
*/
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|
extern char *tcpstates[]; /* XXX ??? */
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|
|
|
static int tcp_attach(struct socket *, struct thread *td);
|
|
static int tcp_connect(struct tcpcb *, struct sockaddr *,
|
|
struct thread *td);
|
|
#ifdef INET6
|
|
static int tcp6_connect(struct tcpcb *, struct sockaddr *,
|
|
struct thread *td);
|
|
#endif /* INET6 */
|
|
static struct tcpcb *
|
|
tcp_disconnect(struct tcpcb *);
|
|
static struct tcpcb *
|
|
tcp_usrclosed(struct tcpcb *);
|
|
|
|
#ifdef TCPDEBUG
|
|
#define TCPDEBUG0 int ostate = 0
|
|
#define TCPDEBUG1() ostate = tp ? tp->t_state : 0
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|
#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \
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|
tcp_trace(TA_USER, ostate, tp, 0, 0, req)
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|
#else
|
|
#define TCPDEBUG0
|
|
#define TCPDEBUG1()
|
|
#define TCPDEBUG2(req)
|
|
#endif
|
|
|
|
/*
|
|
* TCP attaches to socket via pru_attach(), reserving space,
|
|
* and an internet control block.
|
|
*/
|
|
static int
|
|
tcp_usr_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
int s = splnet();
|
|
int error;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp = 0;
|
|
TCPDEBUG0;
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|
|
|
INP_INFO_WLOCK(&tcbinfo);
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|
TCPDEBUG1();
|
|
inp = sotoinpcb(so);
|
|
if (inp) {
|
|
error = EISCONN;
|
|
goto out;
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|
}
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|
|
|
error = tcp_attach(so, td);
|
|
if (error)
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|
goto out;
|
|
|
|
if ((so->so_options & SO_LINGER) && so->so_linger == 0)
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so->so_linger = TCP_LINGERTIME;
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|
|
|
inp = sotoinpcb(so);
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|
tp = intotcpcb(inp);
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|
out:
|
|
TCPDEBUG2(PRU_ATTACH);
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|
INP_INFO_WUNLOCK(&tcbinfo);
|
|
splx(s);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* pru_detach() detaches the TCP protocol from the socket.
|
|
* If the protocol state is non-embryonic, then can't
|
|
* do this directly: have to initiate a pru_disconnect(),
|
|
* which may finish later; embryonic TCB's can just
|
|
* be discarded here.
|
|
*/
|
|
static int
|
|
tcp_usr_detach(struct socket *so)
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|
{
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|
int s = splnet();
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|
int error = 0;
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|
struct inpcb *inp;
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|
struct tcpcb *tp;
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TCPDEBUG0;
|
|
|
|
INP_INFO_WLOCK(&tcbinfo);
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|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_WUNLOCK(&tcbinfo);
|
|
splx(s);
|
|
return EINVAL; /* XXX */
|
|
}
|
|
INP_LOCK(inp);
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
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|
tp = tcp_disconnect(tp);
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|
|
|
TCPDEBUG2(PRU_DETACH);
|
|
if (tp)
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&tcbinfo);
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|
splx(s);
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|
return error;
|
|
}
|
|
|
|
#define INI_NOLOCK 0
|
|
#define INI_READ 1
|
|
#define INI_WRITE 2
|
|
|
|
#define COMMON_START() \
|
|
TCPDEBUG0; \
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|
do { \
|
|
if (inirw == INI_READ) \
|
|
INP_INFO_RLOCK(&tcbinfo); \
|
|
else if (inirw == INI_WRITE) \
|
|
INP_INFO_WLOCK(&tcbinfo); \
|
|
inp = sotoinpcb(so); \
|
|
if (inp == 0) { \
|
|
if (inirw == INI_READ) \
|
|
INP_INFO_RUNLOCK(&tcbinfo); \
|
|
else if (inirw == INI_WRITE) \
|
|
INP_INFO_WUNLOCK(&tcbinfo); \
|
|
splx(s); \
|
|
return EINVAL; \
|
|
} \
|
|
INP_LOCK(inp); \
|
|
if (inirw == INI_READ) \
|
|
INP_INFO_RUNLOCK(&tcbinfo); \
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|
tp = intotcpcb(inp); \
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|
TCPDEBUG1(); \
|
|
} while(0)
|
|
|
|
#define COMMON_END(req) \
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|
out: TCPDEBUG2(req); \
|
|
do { \
|
|
if (tp) \
|
|
INP_UNLOCK(inp); \
|
|
if (inirw == INI_WRITE) \
|
|
INP_INFO_WUNLOCK(&tcbinfo); \
|
|
splx(s); \
|
|
return error; \
|
|
goto out; \
|
|
} while(0)
|
|
|
|
/*
|
|
* Give the socket an address.
|
|
*/
|
|
static int
|
|
tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
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|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct sockaddr_in *sinp;
|
|
const int inirw = INI_READ;
|
|
|
|
COMMON_START();
|
|
|
|
/*
|
|
* Must check for multicast addresses and disallow binding
|
|
* to them.
|
|
*/
|
|
sinp = (struct sockaddr_in *)nam;
|
|
if (sinp->sin_family == AF_INET &&
|
|
IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
|
|
error = EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
error = in_pcbbind(inp, nam, td);
|
|
if (error)
|
|
goto out;
|
|
COMMON_END(PRU_BIND);
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
|
tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct sockaddr_in6 *sin6p;
|
|
const int inirw = INI_READ;
|
|
|
|
COMMON_START();
|
|
|
|
/*
|
|
* Must check for multicast addresses and disallow binding
|
|
* to them.
|
|
*/
|
|
sin6p = (struct sockaddr_in6 *)nam;
|
|
if (sin6p->sin6_family == AF_INET6 &&
|
|
IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
|
|
error = EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
inp->inp_vflag &= ~INP_IPV4;
|
|
inp->inp_vflag |= INP_IPV6;
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr))
|
|
inp->inp_vflag |= INP_IPV4;
|
|
else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
|
|
struct sockaddr_in sin;
|
|
|
|
in6_sin6_2_sin(&sin, sin6p);
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_vflag &= ~INP_IPV6;
|
|
error = in_pcbbind(inp, (struct sockaddr *)&sin, td);
|
|
goto out;
|
|
}
|
|
}
|
|
error = in6_pcbbind(inp, nam, td);
|
|
if (error)
|
|
goto out;
|
|
COMMON_END(PRU_BIND);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* Prepare to accept connections.
|
|
*/
|
|
static int
|
|
tcp_usr_listen(struct socket *so, struct thread *td)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
const int inirw = INI_READ;
|
|
|
|
COMMON_START();
|
|
if (inp->inp_lport == 0)
|
|
error = in_pcbbind(inp, (struct sockaddr *)0, td);
|
|
if (error == 0)
|
|
tp->t_state = TCPS_LISTEN;
|
|
COMMON_END(PRU_LISTEN);
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
|
tcp6_usr_listen(struct socket *so, struct thread *td)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
const int inirw = INI_READ;
|
|
|
|
COMMON_START();
|
|
if (inp->inp_lport == 0) {
|
|
inp->inp_vflag &= ~INP_IPV4;
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0)
|
|
inp->inp_vflag |= INP_IPV4;
|
|
error = in6_pcbbind(inp, (struct sockaddr *)0, td);
|
|
}
|
|
if (error == 0)
|
|
tp->t_state = TCPS_LISTEN;
|
|
COMMON_END(PRU_LISTEN);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int
|
|
tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct sockaddr_in *sinp;
|
|
const int inirw = INI_WRITE;
|
|
|
|
COMMON_START();
|
|
|
|
/*
|
|
* Must disallow TCP ``connections'' to multicast addresses.
|
|
*/
|
|
sinp = (struct sockaddr_in *)nam;
|
|
if (sinp->sin_family == AF_INET
|
|
&& IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) {
|
|
error = EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
if (td && jailed(td->td_ucred))
|
|
prison_remote_ip(td->td_ucred, 0, &sinp->sin_addr.s_addr);
|
|
|
|
if ((error = tcp_connect(tp, nam, td)) != 0)
|
|
goto out;
|
|
error = tcp_output(tp);
|
|
COMMON_END(PRU_CONNECT);
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
|
tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
struct sockaddr_in6 *sin6p;
|
|
const int inirw = INI_WRITE;
|
|
|
|
COMMON_START();
|
|
|
|
/*
|
|
* Must disallow TCP ``connections'' to multicast addresses.
|
|
*/
|
|
sin6p = (struct sockaddr_in6 *)nam;
|
|
if (sin6p->sin6_family == AF_INET6
|
|
&& IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) {
|
|
error = EAFNOSUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) {
|
|
struct sockaddr_in sin;
|
|
|
|
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
in6_sin6_2_sin(&sin, sin6p);
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_vflag &= ~INP_IPV6;
|
|
if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0)
|
|
goto out;
|
|
error = tcp_output(tp);
|
|
goto out;
|
|
}
|
|
inp->inp_vflag &= ~INP_IPV4;
|
|
inp->inp_vflag |= INP_IPV6;
|
|
inp->inp_inc.inc_isipv6 = 1;
|
|
if ((error = tcp6_connect(tp, nam, td)) != 0)
|
|
goto out;
|
|
error = tcp_output(tp);
|
|
COMMON_END(PRU_CONNECT);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static int
|
|
tcp_usr_disconnect(struct socket *so)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
const int inirw = INI_WRITE;
|
|
|
|
COMMON_START();
|
|
tp = tcp_disconnect(tp);
|
|
COMMON_END(PRU_DISCONNECT);
|
|
}
|
|
|
|
/*
|
|
* Accept a connection. Essentially all the work is
|
|
* done at higher levels; just return the address
|
|
* of the peer, storing through addr.
|
|
*/
|
|
static int
|
|
tcp_usr_accept(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
int s;
|
|
int error = 0;
|
|
struct inpcb *inp = NULL;
|
|
struct tcpcb *tp = NULL;
|
|
struct in_addr addr;
|
|
in_port_t port = 0;
|
|
TCPDEBUG0;
|
|
|
|
if (so->so_state & SS_ISDISCONNECTED) {
|
|
error = ECONNABORTED;
|
|
goto out;
|
|
}
|
|
|
|
s = splnet();
|
|
INP_INFO_RLOCK(&tcbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (!inp) {
|
|
INP_INFO_RUNLOCK(&tcbinfo);
|
|
splx(s);
|
|
return (EINVAL);
|
|
}
|
|
INP_LOCK(inp);
|
|
INP_INFO_RUNLOCK(&tcbinfo);
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
|
|
/*
|
|
* We inline in_setpeeraddr and COMMON_END here, so that we can
|
|
* copy the data of interest and defer the malloc until after we
|
|
* release the lock.
|
|
*/
|
|
port = inp->inp_fport;
|
|
addr = inp->inp_faddr;
|
|
|
|
out: TCPDEBUG2(PRU_ACCEPT);
|
|
if (tp)
|
|
INP_UNLOCK(inp);
|
|
splx(s);
|
|
if (error == 0)
|
|
*nam = in_sockaddr(port, &addr);
|
|
return error;
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
|
tcp6_usr_accept(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
int s;
|
|
struct inpcb *inp = NULL;
|
|
int error = 0;
|
|
struct tcpcb *tp = NULL;
|
|
struct in_addr addr;
|
|
struct in6_addr addr6;
|
|
in_port_t port = 0;
|
|
int v4 = 0;
|
|
TCPDEBUG0;
|
|
|
|
if (so->so_state & SS_ISDISCONNECTED) {
|
|
error = ECONNABORTED;
|
|
goto out;
|
|
}
|
|
|
|
s = splnet();
|
|
INP_INFO_RLOCK(&tcbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == 0) {
|
|
INP_INFO_RUNLOCK(&tcbinfo);
|
|
splx(s);
|
|
return (EINVAL);
|
|
}
|
|
INP_LOCK(inp);
|
|
INP_INFO_RUNLOCK(&tcbinfo);
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
/*
|
|
* We inline in6_mapped_peeraddr and COMMON_END here, so that we can
|
|
* copy the data of interest and defer the malloc until after we
|
|
* release the lock.
|
|
*/
|
|
if (inp->inp_vflag & INP_IPV4) {
|
|
v4 = 1;
|
|
port = inp->inp_fport;
|
|
addr = inp->inp_faddr;
|
|
} else {
|
|
port = inp->inp_fport;
|
|
addr6 = inp->in6p_faddr;
|
|
}
|
|
|
|
out: TCPDEBUG2(PRU_ACCEPT);
|
|
if (tp)
|
|
INP_UNLOCK(inp);
|
|
splx(s);
|
|
if (error == 0) {
|
|
if (v4)
|
|
*nam = in6_v4mapsin6_sockaddr(port, &addr);
|
|
else
|
|
*nam = in6_sockaddr(port, &addr6);
|
|
}
|
|
return error;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* This is the wrapper function for in_setsockaddr. We just pass down
|
|
* the pcbinfo for in_setsockaddr to lock. We don't want to do the locking
|
|
* here because in_setsockaddr will call malloc and can block.
|
|
*/
|
|
static int
|
|
tcp_sockaddr(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
return (in_setsockaddr(so, nam, &tcbinfo));
|
|
}
|
|
|
|
/*
|
|
* This is the wrapper function for in_setpeeraddr. We just pass down
|
|
* the pcbinfo for in_setpeeraddr to lock.
|
|
*/
|
|
static int
|
|
tcp_peeraddr(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
return (in_setpeeraddr(so, nam, &tcbinfo));
|
|
}
|
|
|
|
/*
|
|
* Mark the connection as being incapable of further output.
|
|
*/
|
|
static int
|
|
tcp_usr_shutdown(struct socket *so)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
const int inirw = INI_WRITE;
|
|
|
|
COMMON_START();
|
|
socantsendmore(so);
|
|
tp = tcp_usrclosed(tp);
|
|
if (tp)
|
|
error = tcp_output(tp);
|
|
COMMON_END(PRU_SHUTDOWN);
|
|
}
|
|
|
|
/*
|
|
* After a receive, possibly send window update to peer.
|
|
*/
|
|
static int
|
|
tcp_usr_rcvd(struct socket *so, int flags)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
const int inirw = INI_READ;
|
|
|
|
COMMON_START();
|
|
tcp_output(tp);
|
|
COMMON_END(PRU_RCVD);
|
|
}
|
|
|
|
/*
|
|
* Do a send by putting data in output queue and updating urgent
|
|
* marker if URG set. Possibly send more data. Unlike the other
|
|
* pru_*() routines, the mbuf chains are our responsibility. We
|
|
* must either enqueue them or free them. The other pru_* routines
|
|
* generally are caller-frees.
|
|
*/
|
|
static int
|
|
tcp_usr_send(struct socket *so, int flags, struct mbuf *m,
|
|
struct sockaddr *nam, struct mbuf *control, struct thread *td)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
const int inirw = INI_WRITE;
|
|
#ifdef INET6
|
|
int isipv6;
|
|
#endif
|
|
TCPDEBUG0;
|
|
|
|
/*
|
|
* Need write lock here because this function might call
|
|
* tcp_connect or tcp_usrclosed.
|
|
* We really want to have to this function upgrade from read lock
|
|
* to write lock. XXX
|
|
*/
|
|
INP_INFO_WLOCK(&tcbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == NULL) {
|
|
/*
|
|
* OOPS! we lost a race, the TCP session got reset after
|
|
* we checked SS_CANTSENDMORE, eg: while doing uiomove or a
|
|
* network interrupt in the non-splnet() section of sosend().
|
|
*/
|
|
if (m)
|
|
m_freem(m);
|
|
if (control)
|
|
m_freem(control);
|
|
error = ECONNRESET; /* XXX EPIPE? */
|
|
tp = NULL;
|
|
TCPDEBUG1();
|
|
goto out;
|
|
}
|
|
INP_LOCK(inp);
|
|
#ifdef INET6
|
|
isipv6 = nam && nam->sa_family == AF_INET6;
|
|
#endif /* INET6 */
|
|
tp = intotcpcb(inp);
|
|
TCPDEBUG1();
|
|
if (control) {
|
|
/* TCP doesn't do control messages (rights, creds, etc) */
|
|
if (control->m_len) {
|
|
m_freem(control);
|
|
if (m)
|
|
m_freem(m);
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
m_freem(control); /* empty control, just free it */
|
|
}
|
|
if (!(flags & PRUS_OOB)) {
|
|
sbappend(&so->so_snd, m);
|
|
if (nam && tp->t_state < TCPS_SYN_SENT) {
|
|
/*
|
|
* Do implied connect if not yet connected,
|
|
* initialize window to default value, and
|
|
* initialize maxseg/maxopd using peer's cached
|
|
* MSS.
|
|
*/
|
|
#ifdef INET6
|
|
if (isipv6)
|
|
error = tcp6_connect(tp, nam, td);
|
|
else
|
|
#endif /* INET6 */
|
|
error = tcp_connect(tp, nam, td);
|
|
if (error)
|
|
goto out;
|
|
tp->snd_wnd = TTCP_CLIENT_SND_WND;
|
|
tcp_mss(tp, -1);
|
|
}
|
|
|
|
if (flags & PRUS_EOF) {
|
|
/*
|
|
* Close the send side of the connection after
|
|
* the data is sent.
|
|
*/
|
|
socantsendmore(so);
|
|
tp = tcp_usrclosed(tp);
|
|
}
|
|
if (tp != NULL) {
|
|
if (flags & PRUS_MORETOCOME)
|
|
tp->t_flags |= TF_MORETOCOME;
|
|
error = tcp_output(tp);
|
|
if (flags & PRUS_MORETOCOME)
|
|
tp->t_flags &= ~TF_MORETOCOME;
|
|
}
|
|
} else {
|
|
if (sbspace(&so->so_snd) < -512) {
|
|
m_freem(m);
|
|
error = ENOBUFS;
|
|
goto out;
|
|
}
|
|
/*
|
|
* 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);
|
|
if (nam && tp->t_state < TCPS_SYN_SENT) {
|
|
/*
|
|
* Do implied connect if not yet connected,
|
|
* initialize window to default value, and
|
|
* initialize maxseg/maxopd using peer's cached
|
|
* MSS.
|
|
*/
|
|
#ifdef INET6
|
|
if (isipv6)
|
|
error = tcp6_connect(tp, nam, td);
|
|
else
|
|
#endif /* INET6 */
|
|
error = tcp_connect(tp, nam, td);
|
|
if (error)
|
|
goto out;
|
|
tp->snd_wnd = TTCP_CLIENT_SND_WND;
|
|
tcp_mss(tp, -1);
|
|
}
|
|
tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
|
|
tp->t_force = 1;
|
|
error = tcp_output(tp);
|
|
tp->t_force = 0;
|
|
}
|
|
COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB :
|
|
((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND));
|
|
}
|
|
|
|
/*
|
|
* Abort the TCP.
|
|
*/
|
|
static int
|
|
tcp_usr_abort(struct socket *so)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
const int inirw = INI_WRITE;
|
|
|
|
COMMON_START();
|
|
tp = tcp_drop(tp, ECONNABORTED);
|
|
COMMON_END(PRU_ABORT);
|
|
}
|
|
|
|
/*
|
|
* Receive out-of-band data.
|
|
*/
|
|
static int
|
|
tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags)
|
|
{
|
|
int s = splnet();
|
|
int error = 0;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
const int inirw = INI_READ;
|
|
|
|
COMMON_START();
|
|
if ((so->so_oobmark == 0 &&
|
|
(so->so_state & SS_RCVATMARK) == 0) ||
|
|
so->so_options & SO_OOBINLINE ||
|
|
tp->t_oobflags & TCPOOB_HADDATA) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) {
|
|
error = EWOULDBLOCK;
|
|
goto out;
|
|
}
|
|
m->m_len = 1;
|
|
*mtod(m, caddr_t) = tp->t_iobc;
|
|
if ((flags & MSG_PEEK) == 0)
|
|
tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA);
|
|
COMMON_END(PRU_RCVOOB);
|
|
}
|
|
|
|
/* xxx - should be const */
|
|
struct pr_usrreqs tcp_usrreqs = {
|
|
tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind,
|
|
tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach,
|
|
tcp_usr_disconnect, tcp_usr_listen, tcp_peeraddr, tcp_usr_rcvd,
|
|
tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
|
|
tcp_sockaddr, sosend, soreceive, sopoll
|
|
};
|
|
|
|
#ifdef INET6
|
|
struct pr_usrreqs tcp6_usrreqs = {
|
|
tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind,
|
|
tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach,
|
|
tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd,
|
|
tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown,
|
|
in6_mapped_sockaddr, sosend, soreceive, sopoll
|
|
};
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* Common subroutine to open a TCP connection to remote host specified
|
|
* by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local
|
|
* port number if needed. Call in_pcbconnect_setup to do the routing and
|
|
* to choose a local host address (interface). If there is an existing
|
|
* incarnation of the same connection in TIME-WAIT state and if the remote
|
|
* host was sending CC options and if the connection duration was < MSL, then
|
|
* truncate the previous TIME-WAIT state and proceed.
|
|
* Initialize connection parameters and enter SYN-SENT state.
|
|
*/
|
|
static int
|
|
tcp_connect(tp, nam, td)
|
|
register struct tcpcb *tp;
|
|
struct sockaddr *nam;
|
|
struct thread *td;
|
|
{
|
|
struct inpcb *inp = tp->t_inpcb, *oinp;
|
|
struct socket *so = inp->inp_socket;
|
|
struct tcpcb *otp;
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)nam;
|
|
struct rmxp_tao *taop;
|
|
struct rmxp_tao tao_noncached;
|
|
struct in_addr laddr;
|
|
u_short lport;
|
|
int error;
|
|
|
|
if (inp->inp_lport == 0) {
|
|
error = in_pcbbind(inp, (struct sockaddr *)0, td);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Cannot simply call in_pcbconnect, because there might be an
|
|
* earlier incarnation of this same connection still in
|
|
* TIME_WAIT state, creating an ADDRINUSE error.
|
|
*/
|
|
laddr = inp->inp_laddr;
|
|
lport = inp->inp_lport;
|
|
error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport,
|
|
&inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td);
|
|
if (error && oinp == NULL)
|
|
return error;
|
|
if (oinp) {
|
|
if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
|
|
otp->t_state == TCPS_TIME_WAIT &&
|
|
(ticks - otp->t_starttime) < tcp_msl &&
|
|
(otp->t_flags & TF_RCVD_CC))
|
|
otp = tcp_close(otp);
|
|
else
|
|
return EADDRINUSE;
|
|
}
|
|
inp->inp_laddr = laddr;
|
|
inp->inp_faddr = sin->sin_addr;
|
|
inp->inp_fport = sin->sin_port;
|
|
in_pcbrehash(inp);
|
|
|
|
/* 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;
|
|
callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
|
|
tp->iss = tcp_new_isn(tp);
|
|
tp->t_bw_rtseq = tp->iss;
|
|
tcp_sendseqinit(tp);
|
|
|
|
/*
|
|
* Generate a CC value for this connection and
|
|
* check whether CC or CCnew should be used.
|
|
*/
|
|
if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) {
|
|
taop = &tao_noncached;
|
|
bzero(taop, sizeof(*taop));
|
|
}
|
|
|
|
tp->cc_send = CC_INC(tcp_ccgen);
|
|
if (taop->tao_ccsent != 0 &&
|
|
CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
|
|
taop->tao_ccsent = tp->cc_send;
|
|
} else {
|
|
taop->tao_ccsent = 0;
|
|
tp->t_flags |= TF_SENDCCNEW;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef INET6
|
|
static int
|
|
tcp6_connect(tp, nam, td)
|
|
register struct tcpcb *tp;
|
|
struct sockaddr *nam;
|
|
struct thread *td;
|
|
{
|
|
struct inpcb *inp = tp->t_inpcb, *oinp;
|
|
struct socket *so = inp->inp_socket;
|
|
struct tcpcb *otp;
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
|
|
struct in6_addr *addr6;
|
|
struct rmxp_tao *taop;
|
|
struct rmxp_tao tao_noncached;
|
|
int error;
|
|
|
|
if (inp->inp_lport == 0) {
|
|
error = in6_pcbbind(inp, (struct sockaddr *)0, td);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Cannot simply call in_pcbconnect, because there might be an
|
|
* earlier incarnation of this same connection still in
|
|
* TIME_WAIT state, creating an ADDRINUSE error.
|
|
*/
|
|
error = in6_pcbladdr(inp, nam, &addr6);
|
|
if (error)
|
|
return error;
|
|
oinp = in6_pcblookup_hash(inp->inp_pcbinfo,
|
|
&sin6->sin6_addr, sin6->sin6_port,
|
|
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
|
|
? addr6
|
|
: &inp->in6p_laddr,
|
|
inp->inp_lport, 0, NULL);
|
|
if (oinp) {
|
|
if (oinp != inp && (otp = intotcpcb(oinp)) != NULL &&
|
|
otp->t_state == TCPS_TIME_WAIT &&
|
|
(ticks - otp->t_starttime) < tcp_msl &&
|
|
(otp->t_flags & TF_RCVD_CC))
|
|
otp = tcp_close(otp);
|
|
else
|
|
return EADDRINUSE;
|
|
}
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
|
|
inp->in6p_laddr = *addr6;
|
|
inp->in6p_faddr = sin6->sin6_addr;
|
|
inp->inp_fport = sin6->sin6_port;
|
|
if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0)
|
|
inp->in6p_flowinfo = sin6->sin6_flowinfo;
|
|
in_pcbrehash(inp);
|
|
|
|
/* 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;
|
|
callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp);
|
|
tp->iss = tcp_new_isn(tp);
|
|
tp->t_bw_rtseq = tp->iss;
|
|
tcp_sendseqinit(tp);
|
|
|
|
/*
|
|
* Generate a CC value for this connection and
|
|
* check whether CC or CCnew should be used.
|
|
*/
|
|
if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) {
|
|
taop = &tao_noncached;
|
|
bzero(taop, sizeof(*taop));
|
|
}
|
|
|
|
tp->cc_send = CC_INC(tcp_ccgen);
|
|
if (taop->tao_ccsent != 0 &&
|
|
CC_GEQ(tp->cc_send, taop->tao_ccsent)) {
|
|
taop->tao_ccsent = tp->cc_send;
|
|
} else {
|
|
taop->tao_ccsent = 0;
|
|
tp->t_flags |= TF_SENDCCNEW;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
/*
|
|
* The new sockopt interface makes it possible for us to block in the
|
|
* copyin/out step (if we take a page fault). Taking a page fault at
|
|
* splnet() is probably a Bad Thing. (Since sockets and pcbs both now
|
|
* use TSM, there probably isn't any need for this function to run at
|
|
* splnet() any more. This needs more examination.)
|
|
*/
|
|
int
|
|
tcp_ctloutput(so, sopt)
|
|
struct socket *so;
|
|
struct sockopt *sopt;
|
|
{
|
|
int error, opt, optval, s;
|
|
struct inpcb *inp;
|
|
struct tcpcb *tp;
|
|
|
|
error = 0;
|
|
s = splnet(); /* XXX */
|
|
INP_INFO_RLOCK(&tcbinfo);
|
|
inp = sotoinpcb(so);
|
|
if (inp == NULL) {
|
|
INP_INFO_RUNLOCK(&tcbinfo);
|
|
splx(s);
|
|
return (ECONNRESET);
|
|
}
|
|
INP_LOCK(inp);
|
|
INP_INFO_RUNLOCK(&tcbinfo);
|
|
if (sopt->sopt_level != IPPROTO_TCP) {
|
|
#ifdef INET6
|
|
if (INP_CHECK_SOCKAF(so, AF_INET6))
|
|
error = ip6_ctloutput(so, sopt);
|
|
else
|
|
#endif /* INET6 */
|
|
error = ip_ctloutput(so, sopt);
|
|
INP_UNLOCK(inp);
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
tp = intotcpcb(inp);
|
|
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_SET:
|
|
switch (sopt->sopt_name) {
|
|
case TCP_NODELAY:
|
|
case TCP_NOOPT:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
switch (sopt->sopt_name) {
|
|
case TCP_NODELAY:
|
|
opt = TF_NODELAY;
|
|
break;
|
|
case TCP_NOOPT:
|
|
opt = TF_NOOPT;
|
|
break;
|
|
default:
|
|
opt = 0; /* dead code to fool gcc */
|
|
break;
|
|
}
|
|
|
|
if (optval)
|
|
tp->t_flags |= opt;
|
|
else
|
|
tp->t_flags &= ~opt;
|
|
break;
|
|
|
|
case TCP_NOPUSH:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
if (optval)
|
|
tp->t_flags |= TF_NOPUSH;
|
|
else {
|
|
tp->t_flags &= ~TF_NOPUSH;
|
|
error = tcp_output(tp);
|
|
}
|
|
break;
|
|
|
|
case TCP_MAXSEG:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
if (optval > 0 && optval <= tp->t_maxseg)
|
|
tp->t_maxseg = optval;
|
|
else
|
|
error = EINVAL;
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SOPT_GET:
|
|
switch (sopt->sopt_name) {
|
|
case TCP_NODELAY:
|
|
optval = tp->t_flags & TF_NODELAY;
|
|
break;
|
|
case TCP_MAXSEG:
|
|
optval = tp->t_maxseg;
|
|
break;
|
|
case TCP_NOOPT:
|
|
optval = tp->t_flags & TF_NOOPT;
|
|
break;
|
|
case TCP_NOPUSH:
|
|
optval = tp->t_flags & TF_NOPUSH;
|
|
break;
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
}
|
|
if (error == 0)
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
}
|
|
INP_UNLOCK(inp);
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* tcp_sendspace and tcp_recvspace are the default send and receive window
|
|
* sizes, respectively. These are obsolescent (this information should
|
|
* be set by the route).
|
|
*/
|
|
u_long tcp_sendspace = 1024*32;
|
|
SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW,
|
|
&tcp_sendspace , 0, "Maximum outgoing TCP datagram size");
|
|
u_long tcp_recvspace = 1024*64;
|
|
SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
|
|
&tcp_recvspace , 0, "Maximum incoming TCP datagram size");
|
|
|
|
/*
|
|
* Attach TCP protocol to socket, allocating
|
|
* internet protocol control block, tcp control block,
|
|
* bufer space, and entering LISTEN state if to accept connections.
|
|
*/
|
|
static int
|
|
tcp_attach(so, td)
|
|
struct socket *so;
|
|
struct thread *td;
|
|
{
|
|
register struct tcpcb *tp;
|
|
struct inpcb *inp;
|
|
int error;
|
|
#ifdef INET6
|
|
int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0;
|
|
#endif
|
|
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
error = soreserve(so, tcp_sendspace, tcp_recvspace);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
error = in_pcballoc(so, &tcbinfo, td);
|
|
if (error)
|
|
return (error);
|
|
inp = sotoinpcb(so);
|
|
#ifdef INET6
|
|
if (isipv6) {
|
|
inp->inp_vflag |= INP_IPV6;
|
|
inp->in6p_hops = -1; /* use kernel default */
|
|
}
|
|
else
|
|
#endif
|
|
inp->inp_vflag |= INP_IPV4;
|
|
tp = tcp_newtcpcb(inp);
|
|
if (tp == 0) {
|
|
int nofd = so->so_state & SS_NOFDREF; /* XXX */
|
|
|
|
so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
|
|
#ifdef INET6
|
|
if (isipv6)
|
|
in6_pcbdetach(inp);
|
|
else
|
|
#endif
|
|
in_pcbdetach(inp);
|
|
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).
|
|
*/
|
|
static struct tcpcb *
|
|
tcp_disconnect(tp)
|
|
register struct tcpcb *tp;
|
|
{
|
|
struct socket *so = tp->t_inpcb->inp_socket;
|
|
|
|
if (tp->t_state < TCPS_ESTABLISHED)
|
|
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.
|
|
*/
|
|
static struct tcpcb *
|
|
tcp_usrclosed(tp)
|
|
register struct tcpcb *tp;
|
|
{
|
|
|
|
switch (tp->t_state) {
|
|
|
|
case TCPS_CLOSED:
|
|
case TCPS_LISTEN:
|
|
tp->t_state = TCPS_CLOSED;
|
|
tp = tcp_close(tp);
|
|
break;
|
|
|
|
case TCPS_SYN_SENT:
|
|
case TCPS_SYN_RECEIVED:
|
|
tp->t_flags |= TF_NEEDFIN;
|
|
break;
|
|
|
|
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) {
|
|
soisdisconnected(tp->t_inpcb->inp_socket);
|
|
/* To prevent the connection hanging in FIN_WAIT_2 forever. */
|
|
if (tp->t_state == TCPS_FIN_WAIT_2)
|
|
callout_reset(tp->tt_2msl, tcp_maxidle,
|
|
tcp_timer_2msl, tp);
|
|
}
|
|
return (tp);
|
|
}
|
|
|