Obey RFC 793, section 3.4:
Several examples of connection initiation follow. Although these examples do not show connection synchronization using data-carrying segments, this is perfectly legitimate, so long as the receiving TCP doesn't deliver the data to the user until it is clear the data is valid (i.e., the data must be buffered at the receiver until the connection reaches the ESTABLISHED state).
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_fsm.h 8.1 (Berkeley) 6/10/93
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* $Id: tcp_fsm.h,v 1.2 1994/08/02 07:48:58 davidg Exp $
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* $Id: tcp_fsm.h,v 1.3 1994/08/21 05:27:36 paul Exp $
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*/
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#ifndef _NETINET_TCP_FSM_H_
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@ -60,6 +60,7 @@
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#define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
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#define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
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#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
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#define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
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#ifdef TCPOUTFLAGS
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_input.c 8.5 (Berkeley) 4/10/94
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* $Id: tcp_input.c,v 1.5 1994/08/02 07:49:01 davidg Exp $
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* $Id: tcp_input.c,v 1.6 1994/08/18 22:35:32 wollman Exp $
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*/
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#ifndef TUBA_INCLUDE
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@ -182,7 +182,7 @@ tcp_reass(tp, ti, m)
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* Present data to user, advancing rcv_nxt through
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* completed sequence space.
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*/
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if (TCPS_HAVERCVDSYN(tp->t_state) == 0)
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if (TCPS_HAVEESTABLISHED(tp->t_state) == 0)
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return (0);
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ti = tp->seg_next;
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if (ti == (struct tcpiphdr *)tp || ti->ti_seq != tp->rcv_nxt)
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@ -31,7 +31,7 @@
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* SUCH DAMAGE.
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*
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* @(#)tcp_input.c 8.5 (Berkeley) 4/10/94
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* $Id: tcp_input.c,v 1.5 1994/08/02 07:49:01 davidg Exp $
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* $Id: tcp_input.c,v 1.6 1994/08/18 22:35:32 wollman Exp $
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*/
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#ifndef TUBA_INCLUDE
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@ -182,7 +182,7 @@ tcp_reass(tp, ti, m)
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* Present data to user, advancing rcv_nxt through
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* completed sequence space.
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*/
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if (TCPS_HAVERCVDSYN(tp->t_state) == 0)
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if (TCPS_HAVEESTABLISHED(tp->t_state) == 0)
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return (0);
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ti = tp->seg_next;
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if (ti == (struct tcpiphdr *)tp || ti->ti_seq != tp->rcv_nxt)
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