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tcp_usrreq.c
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tcp_usrreq.c
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/* $NetBSD: tcp_usrreq.c,v 1.119 2006/07/23 22:06:13 ad 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, 2005 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.
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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. 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tcp_usrreq.c,v 1.119 2006/07/23 22:06:13 ad Exp $");
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "opt_tcp_debug.h"
#include "opt_mbuftrace.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/domain.h>
#include <sys/sysctl.h>
#include <sys/kauth.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>
#include <netinet/in_offload.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_space.h"
#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif /*IPSEC*/
/*
* TCP protocol interface to socket abstraction.
*/
/*
* 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(struct socket *so, int req,
struct mbuf *m, struct mbuf *nam, struct mbuf *control, struct lwp *l)
{
struct inpcb *inp;
#ifdef INET6
struct in6pcb *in6p;
#endif
struct tcpcb *tp = NULL;
int s;
int error = 0;
#ifdef TCP_DEBUG
int ostate = 0;
#endif
int family; /* family of the socket */
family = so->so_proto->pr_domain->dom_family;
if (req == PRU_CONTROL) {
switch (family) {
#ifdef INET
case PF_INET:
return (in_control(so, (long)m, (caddr_t)nam,
(struct ifnet *)control, l));
#endif
#ifdef INET6
case PF_INET6:
return (in6_control(so, (long)m, (caddr_t)nam,
(struct ifnet *)control, l));
#endif
default:
return EAFNOSUPPORT;
}
}
if (req == PRU_PURGEIF) {
switch (family) {
#ifdef INET
case PF_INET:
in_pcbpurgeif0(&tcbtable, (struct ifnet *)control);
in_purgeif((struct ifnet *)control);
in_pcbpurgeif(&tcbtable, (struct ifnet *)control);
break;
#endif
#ifdef INET6
case PF_INET6:
in6_pcbpurgeif0(&tcbtable, (struct ifnet *)control);
in6_purgeif((struct ifnet *)control);
in6_pcbpurgeif(&tcbtable, (struct ifnet *)control);
break;
#endif
default:
return (EAFNOSUPPORT);
}
return (0);
}
s = splsoftnet();
switch (family) {
#ifdef INET
case PF_INET:
inp = sotoinpcb(so);
#ifdef INET6
in6p = NULL;
#endif
break;
#endif
#ifdef INET6
case PF_INET6:
inp = NULL;
in6p = sotoin6pcb(so);
break;
#endif
default:
splx(s);
return EAFNOSUPPORT;
}
#ifdef DIAGNOSTIC
#ifdef INET6
if (inp && in6p)
panic("tcp_usrreq: both inp and in6p set to non-NULL");
#endif
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;
}
#ifdef INET
if (inp) {
tp = intotcpcb(inp);
/* WHAT IF TP IS 0? */
#ifdef KPROF
tcp_acounts[tp->t_state][req]++;
#endif
#ifdef TCP_DEBUG
ostate = tp->t_state;
#endif
}
#endif
#ifdef INET6
if (in6p) {
tp = in6totcpcb(in6p);
/* WHAT IF TP IS 0? */
#ifdef KPROF
tcp_acounts[tp->t_state][req]++;
#endif
#ifdef TCP_DEBUG
ostate = tp->t_state;
#endif
}
#endif
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) {
#ifdef INET
case PF_INET:
error = in_pcbbind(inp, nam, l);
break;
#endif
#ifdef INET6
case PF_INET6:
error = in6_pcbbind(in6p, nam, l);
if (!error) {
/* mapped addr case */
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr))
tp->t_family = AF_INET;
else
tp->t_family = AF_INET6;
}
break;
#endif
}
break;
/*
* Prepare to accept connections.
*/
case PRU_LISTEN:
#ifdef INET
if (inp && inp->inp_lport == 0) {
error = in_pcbbind(inp, (struct mbuf *)0,
(struct lwp *)0);
if (error)
break;
}
#endif
#ifdef INET6
if (in6p && in6p->in6p_lport == 0) {
error = in6_pcbbind(in6p, (struct mbuf *)0,
(struct lwp *)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:
#ifdef INET
if (inp) {
if (inp->inp_lport == 0) {
error = in_pcbbind(inp, (struct mbuf *)0,
(struct lwp *)0);
if (error)
break;
}
error = in_pcbconnect(inp, nam, l);
}
#endif
#ifdef INET6
if (in6p) {
if (in6p->in6p_lport == 0) {
error = in6_pcbbind(in6p, (struct mbuf *)0,
(struct lwp *)0);
if (error)
break;
}
error = in6_pcbconnect(in6p, nam, l);
if (!error) {
/* mapped addr case */
if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr))
tp->t_family = AF_INET;
else
tp->t_family = AF_INET6;
}
}
#endif
if (error)
break;
tp->t_template = tcp_template(tp);
if (tp->t_template == 0) {
#ifdef INET
if (inp)
in_pcbdisconnect(inp);
#endif
#ifdef INET6
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, 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:
#ifdef INET
if (inp)
in_setpeeraddr(inp, nam);
#endif
#ifdef INET6
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:
/*
* soreceive() calls this function when a user receives
* ancillary data on a listening socket. We don't call
* tcp_output in such a case, since there is no header
* template for a listening socket and hence the kernel
* will panic.
*/
if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) != 0)
(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;
}
sbappendstream(&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.
*/
sbappendstream(&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:
#ifdef INET
if (inp)
in_setsockaddr(inp, nam);
#endif
#ifdef INET6
if (in6p)
in6_setsockaddr(in6p, nam);
#endif
break;
case PRU_PEERADDR:
#ifdef INET
if (inp)
in_setpeeraddr(inp, nam);
#endif
#ifdef INET6
if (in6p)
in6_setpeeraddr(in6p, nam);
#endif
break;
default:
panic("tcp_usrreq");
}
#ifdef TCP_DEBUG
if (tp && (so->so_options & SO_DEBUG))
tcp_trace(TA_USER, ostate, tp, NULL, req);
#endif
release:
splx(s);
return (error);
}
int
tcp_ctloutput(int op, struct socket *so, int level, int optname,
struct mbuf **mp)
{
int error = 0, s;
struct inpcb *inp;
#ifdef INET6
struct in6pcb *in6p;
#endif
struct tcpcb *tp;
struct mbuf *m;
int i;
int family; /* family of the socket */
family = so->so_proto->pr_domain->dom_family;
s = splsoftnet();
switch (family) {
#ifdef INET
case PF_INET:
inp = sotoinpcb(so);
#ifdef INET6
in6p = NULL;
#endif
break;
#endif
#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) {
#ifdef INET
case PF_INET:
error = ip_ctloutput(op, so, level, optname, mp);
break;
#endif
#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) {
#ifdef TCP_SIGNATURE
case TCP_MD5SIG:
if (m == NULL || m->m_len < sizeof (int))
error = EINVAL;
if (error)
break;
if (*mtod(m, int *) > 0)
tp->t_flags |= TF_SIGNATURE;
else
tp->t_flags &= ~TF_SIGNATURE;
break;
#endif /* TCP_SIGNATURE */
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);
MCLAIM(m, so->so_mowner);
switch (optname) {
#ifdef TCP_SIGNATURE
case TCP_MD5SIG:
*mtod(m, int *) = (tp->t_flags & TF_SIGNATURE) ? 1 : 0;
break;
#endif
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*32
#endif
int tcp_sendspace = TCP_SENDSPACE;
#ifndef TCP_RECVSPACE
#define TCP_RECVSPACE 1024*32
#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(struct socket *so)
{
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;
#ifdef MBUFTRACE
so->so_mowner = &tcp_mowner;
so->so_rcv.sb_mowner = &tcp_rx_mowner;
so->so_snd.sb_mowner = &tcp_tx_mowner;
#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);
}
switch (family) {
#ifdef INET
case PF_INET:
error = in_pcballoc(so, &tcbtable);
if (error)
return (error);
inp = sotoinpcb(so);
#ifdef INET6
in6p = NULL;
#endif
break;
#endif
#ifdef INET6
case PF_INET6:
error = in6_pcballoc(so, &tcbtable);
if (error)
return (error);
inp = NULL;
in6p = sotoin6pcb(so);
break;
#endif
default:
return EAFNOSUPPORT;
}
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 */
#ifdef INET
if (inp)
in_pcbdetach(inp);
#endif
#ifdef INET6
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(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(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;
if (so)
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);
}
/*
* sysctl helper routine for net.inet.ip.mssdflt. it can't be less
* than 32.
*/
static int
sysctl_net_inet_tcp_mssdflt(SYSCTLFN_ARGS)
{
int error, mssdflt;
struct sysctlnode node;
mssdflt = tcp_mssdflt;
node = *rnode;
node.sysctl_data = &mssdflt;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);
if (mssdflt < 32)
return (EINVAL);
tcp_mssdflt = mssdflt;
return (0);
}
/*
* sysctl helper routine for setting port related values under
* net.inet.ip and net.inet6.ip6. does basic range checking and does
* additional checks for each type. this code has placed in
* tcp_input.c since INET and INET6 both use the same tcp code.
*
* this helper is not static so that both inet and inet6 can use it.
*/
int
sysctl_net_inet_ip_ports(SYSCTLFN_ARGS)
{
int error, tmp;
int apmin, apmax;
#ifndef IPNOPRIVPORTS
int lpmin, lpmax;
#endif /* IPNOPRIVPORTS */
struct sysctlnode node;
if (namelen != 0)
return (EINVAL);
switch (name[-3]) {
#ifdef INET
case PF_INET:
apmin = anonportmin;
apmax = anonportmax;
#ifndef IPNOPRIVPORTS
lpmin = lowportmin;
lpmax = lowportmax;
#endif /* IPNOPRIVPORTS */
break;
#endif /* INET */
#ifdef INET6
case PF_INET6:
apmin = ip6_anonportmin;
apmax = ip6_anonportmax;
#ifndef IPNOPRIVPORTS
lpmin = ip6_lowportmin;
lpmax = ip6_lowportmax;
#endif /* IPNOPRIVPORTS */
break;
#endif /* INET6 */