1340 lines
34 KiB
Plaintext
1340 lines
34 KiB
Plaintext
/* $NetBSD: tp.trans,v 1.9 2004/02/13 17:56:17 wiz Exp $ */
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/* NEW */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. 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
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* 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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* @(#)tp.trans 8.1 (Berkeley) 6/10/93
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*/
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/***********************************************************
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Copyright IBM Corporation 1987
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of IBM not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/*
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* ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
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*/
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/*
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* Transition file for TP.
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*
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* DO NOT:
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* - change the order of any of the events or states. to do so will
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* make tppt, netstat, etc. cease working.
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*
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* NOTE:
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* some hooks exist for data on (dis)connect, but it's ***NOT***SUPPORTED***
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* (read: may not work!)
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*
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* I tried to put everything that causes a change of state in here, hence
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* there are some seemingly trivial events like T_DETACH and T_LISTEN_req.
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*
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* Almost everything having to do w/ setting & cancelling timers is here
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* but once it was debugged, I moved the setting of the
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* keepalive (sendack) timer to tp_emit(), where an AK_TPDU is sent.
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* This is so the code wouldn't be duplicated all over creation in here.
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*
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*/
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*PROTOCOL tp
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*INCLUDE
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{
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/* @(#)tp.trans 8.1 (Berkeley) 6/10/93 */
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#include <sys/param.h>
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#include <sys/systm.h>
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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/mbuf.h>
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#include <sys/time.h>
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#include <sys/errno.h>
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#include <netiso/tp_param.h>
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#include <netiso/tp_stat.h>
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#include <netiso/tp_pcb.h>
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#include <netiso/tp_tpdu.h>
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#include <netiso/argo_debug.h>
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#include <netiso/tp_trace.h>
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#include <netiso/iso_errno.h>
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#include <netiso/tp_seq.h>
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#include <netiso/cons.h>
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#define DRIVERTRACE TPPTdriver
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#define sbwakeup(sb) sowakeup(p->tp_sock, sb);
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#define MCPY(d, w) (d ? m_copym(d, 0, (int)M_COPYALL, w): 0)
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static trick_hc = 1;
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int tp_emit(),
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tp_goodack(), tp_goodXack(),
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tp_stash()
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;
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void tp_indicate(), tp_getoptions(),
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tp_soisdisconnecting(), tp_soisdisconnected(),
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tp_recycle_tsuffix(),
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#ifdef TP_DEBUG_TIMERS
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tp_etimeout(), tp_euntimeout(),
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tp_ctimeout(), tp_cuntimeout(),
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tp_ctimeout_MIN(),
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#endif
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tp_freeref(), tp_detach(),
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tp0_stash(), tp0_send(),
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tp_netcmd(), tp_send()
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;
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typedef struct tp_pcb tpcb_struct;
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}
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*PCB tpcb_struct SYNONYM P
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*STATES
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TP_CLOSED
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TP_CRSENT
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TP_AKWAIT
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TP_OPEN
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TP_CLOSING
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TP_REFWAIT
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TP_LISTENING /* Local to this implementation */
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TP_CONFIRMING /* Local to this implementation */
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*EVENTS { struct timeval e_time; } SYNONYM E
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/*
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* C (typically cancelled) timers -
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*
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* let these be the first ones so for the sake of convenience
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* their values are 0--> n-1
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* DO NOT CHANGE THE ORDER OF THESE TIMER EVENTS!!
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*/
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TM_inact
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TM_retrans
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/* TM_retrans is used for all
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* simple retransmissions - CR,CC,XPD,DR
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*/
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TM_sendack
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/* TM_sendack does dual duty - keepalive AND closed-window
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* Probes.
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* It's set w/ keepalive-ticks every time an ack is sent.
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* (this is done in (void) tp_emit() ).
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* Whenever a DT arrives which doesn't require immediate acking,
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* a separate fast-timeout flag is set ensuring 200ms response.
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*/
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TM_notused
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/*
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* E (typically expired) timers - these may be in any order.
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* These cause procedures to be executed directly; may not
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* cause an 'event' as we know them here.
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*/
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TM_reference { SeqNum e_low; SeqNum e_high; int e_retrans; }
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TM_data_retrans { SeqNum e_low; SeqNum e_high; int e_retrans; }
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/* NOTE: in tp_input is a minor optimization that assumes that
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* for all tpdu types that can take e_data and e_datalen, these
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* fields fall in the same place in the event structure, that is,
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* e_data is the first field and e_datalen is the 2nd field.
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*/
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ER_TPDU {
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u_char e_reason;
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}
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CR_TPDU { struct mbuf *e_data; /* first field */
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int e_datalen; /* 2nd field */
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u_int e_cdt;
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}
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DR_TPDU { struct mbuf *e_data; /* first field */
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int e_datalen; /* 2nd field */
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u_short e_sref;
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u_char e_reason;
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}
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DC_TPDU
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CC_TPDU { struct mbuf *e_data; /* first field */
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int e_datalen; /* 2nd field */
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u_short e_sref;
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u_int e_cdt;
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}
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AK_TPDU { u_int e_cdt;
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SeqNum e_seq;
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SeqNum e_subseq;
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u_char e_fcc_present;
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}
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DT_TPDU { struct mbuf *e_data; /* first field */
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int e_datalen; /* 2nd field */
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u_int e_eot;
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SeqNum e_seq;
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}
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XPD_TPDU { struct mbuf *e_data; /* first field */
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int e_datalen; /* 2nd field */
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SeqNum e_seq;
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}
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XAK_TPDU { SeqNum e_seq; }
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T_CONN_req
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T_DISC_req { u_char e_reason; }
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T_LISTEN_req
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T_DATA_req
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T_XPD_req
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T_USR_rcvd
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T_USR_Xrcvd
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T_DETACH
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T_NETRESET
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T_ACPT_req
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*TRANSITIONS
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/* TP_AKWAIT doesn't exist in TP 0 */
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SAME <== TP_AKWAIT [ CC_TPDU, DC_TPDU, XAK_TPDU ]
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DEFAULT
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NULLACTION
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;
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/* applicable in TP4, TP0 */
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SAME <== TP_REFWAIT DR_TPDU
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( $$.e_sref != 0 )
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{
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(void) tp_emit(DC_TPDU_type, $P, 0, 0, NULL);
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}
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;
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/* applicable in TP4, TP0 */
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SAME <== TP_REFWAIT [ CR_TPDU, CC_TPDU, DT_TPDU,
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DR_TPDU, XPD_TPDU, AK_TPDU, XAK_TPDU, DC_TPDU, ER_TPDU ]
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DEFAULT
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{
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# ifdef TP_DEBUG
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if( $E.ev_number != AK_TPDU )
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printf("TPDU 0x%x in REFWAIT!!!!\n", $E.ev_number);
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# endif TP_DEBUG
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}
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;
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/* applicable in TP4, TP0 */
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SAME <== TP_REFWAIT [ T_DETACH, T_DISC_req ]
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DEFAULT
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NULLACTION
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;
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/* applicable in TP4, TP0 */
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SAME <== TP_CRSENT AK_TPDU
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($P.tp_class == TP_CLASS_0)
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{
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/* oh, man is this grotesque or what? */
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(void) tp_goodack($P, $$.e_cdt, $$.e_seq, $$.e_subseq);
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/* but it's necessary because this pseudo-ack may happen
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* before the CC arrives, but we HAVE to adjust the
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* snduna as a result of the ack, WHENEVER it arrives
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*/
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}
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;
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/* applicable in TP4, TP0 */
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SAME <== TP_CRSENT
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[ CR_TPDU, DC_TPDU, DT_TPDU, XPD_TPDU, XAK_TPDU ]
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DEFAULT
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NULLACTION
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;
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/* applicable in TP4, TP0 */
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SAME <== TP_CLOSED [ DT_TPDU, XPD_TPDU,
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ER_TPDU, DC_TPDU, AK_TPDU, XAK_TPDU ]
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DEFAULT
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NULLACTION
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;
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/* TP_CLOSING doesn't exist in TP 0 */
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SAME <== TP_CLOSING
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[ CC_TPDU, CR_TPDU, DT_TPDU, XPD_TPDU, AK_TPDU, XAK_TPDU ]
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DEFAULT
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NULLACTION
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;
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/* DC_TPDU doesn't exist in TP 0 */
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SAME <== TP_OPEN DC_TPDU
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DEFAULT
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NULLACTION
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;
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/* applicable in TP4, TP0 */
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SAME <== TP_LISTENING [DR_TPDU, CC_TPDU, DT_TPDU, XPD_TPDU,
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ER_TPDU, DC_TPDU, AK_TPDU, XAK_TPDU ]
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DEFAULT
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NULLACTION
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;
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/* applicable in TP4, TP0 */
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TP_LISTENING <== TP_CLOSED T_LISTEN_req
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DEFAULT
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NULLACTION
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;
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/* applicable in TP4, TP0 */
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TP_CLOSED <== [ TP_LISTENING, TP_CLOSED ] T_DETACH
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DEFAULT
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{
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tp_detach($P);
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}
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;
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TP_CONFIRMING <== TP_LISTENING CR_TPDU
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( $P.tp_class == TP_CLASS_0)
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{
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$P.tp_refstate = REF_OPEN; /* has timers ??? */
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}
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;
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TP_CONFIRMING <== TP_LISTENING CR_TPDU
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DEFAULT
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{
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IFTRACE(D_CONN)
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tptrace(TPPTmisc, "CR datalen data", $$.e_datalen, $$.e_data,0,0);
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ENDTRACE
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IFDEBUG(D_CONN)
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printf("CR datalen 0x%x data 0x%x", $$.e_datalen, $$.e_data);
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ENDDEBUG
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$P.tp_refstate = REF_OPEN; /* has timers */
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$P.tp_fcredit = $$.e_cdt;
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if ($$.e_datalen > 0) {
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/* n/a for class 0 */
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ASSERT($P.tp_Xrcv.sb_cc == 0);
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sbappendrecord(&$P.tp_Xrcv, $$.e_data);
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$$.e_data = NULL;
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}
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}
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;
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TP_OPEN <== TP_CONFIRMING T_ACPT_req
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( $P.tp_class == TP_CLASS_0 )
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{
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IncStat(ts_tp0_conn);
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IFTRACE(D_CONN)
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tptrace(TPPTmisc, "Confiming", $P, 0,0,0);
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ENDTRACE
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IFDEBUG(D_CONN)
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printf("Confirming connection: $P" );
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ENDDEBUG
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soisconnected($P.tp_sock);
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(void) tp_emit(CC_TPDU_type, $P, 0,0, NULL) ;
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$P.tp_fcredit = 1;
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}
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;
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TP_AKWAIT <== TP_CONFIRMING T_ACPT_req
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(tp_emit(CC_TPDU_type, $P, 0,0, MCPY($P.tp_ucddata, M_NOWAIT)) == 0)
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{
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IncStat(ts_tp4_conn); /* even though not quite open */
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IFTRACE(D_CONN)
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tptrace(TPPTmisc, "Confiming", $P, 0,0,0);
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ENDTRACE
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IFDEBUG(D_CONN)
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printf("Confirming connection: $P" );
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ENDDEBUG
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tp_getoptions($P);
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soisconnecting($P.tp_sock);
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if (($P.tp_rx_strat & TPRX_FASTSTART) && ($P.tp_fcredit > 0))
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$P.tp_cong_win = $P.tp_fcredit * $P.tp_l_tpdusize;
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$P.tp_retrans = $P.tp_Nretrans;
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tp_ctimeout($P, TM_retrans, (int)$P.tp_cc_ticks);
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}
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;
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/* TP4 only */
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TP_CLOSED <== TP_CONFIRMING T_ACPT_req
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DEFAULT /* emit failed */
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{
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IFDEBUG(D_CONN)
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printf("event: CR_TPDU emit CC failed done " );
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ENDDEBUG
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soisdisconnected($P.tp_sock);
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tp_recycle_tsuffix($P);
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tp_freeref($P.tp_lref);
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tp_detach($P);
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}
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;
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/* applicable in TP4, TP0 */
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TP_CRSENT <== TP_CLOSED T_CONN_req
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DEFAULT
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{
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int error;
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struct mbuf *data = NULL;
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IFTRACE(D_CONN)
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tptrace(TPPTmisc, "T_CONN_req flags ucddata", (int)$P.tp_flags,
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$P.tp_ucddata, 0, 0);
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ENDTRACE
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data = MCPY($P.tp_ucddata, M_WAIT);
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if (data) {
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IFDEBUG(D_CONN)
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printf("T_CONN_req.trans m_copy cc 0x%x\n",
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$P.tp_ucddata);
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dump_mbuf(data, "sosnd @ T_CONN_req");
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ENDDEBUG
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}
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if (error = tp_emit(CR_TPDU_type, $P, 0, 0, data) )
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return error; /* driver WON'T change state; will return error */
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$P.tp_refstate = REF_OPEN; /* has timers */
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if($P.tp_class != TP_CLASS_0) {
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$P.tp_retrans = $P.tp_Nretrans;
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tp_ctimeout($P, TM_retrans, (int)$P.tp_cr_ticks);
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}
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}
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;
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/* applicable in TP4, TP0, but state TP_AKWAIT doesn't apply to TP0 */
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TP_REFWAIT <== [ TP_CRSENT, TP_AKWAIT, TP_OPEN ] DR_TPDU
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DEFAULT
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{
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sbflush(&$P.tp_Xrcv); /* purge non-delivered data data */
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if ($$.e_datalen > 0) {
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sbappendrecord(&$P.tp_Xrcv, $$.e_data);
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$$.e_data = NULL;
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}
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if ($P.tp_state == TP_OPEN)
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tp_indicate(T_DISCONNECT, $P, 0);
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else {
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int so_error = ECONNREFUSED;
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if ($$.e_reason != (E_TP_NO_SESSION ^ TP_ERROR_MASK) &&
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$$.e_reason != (E_TP_NO_CR_ON_NC ^ TP_ERROR_MASK) &&
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$$.e_reason != (E_TP_REF_OVERFLOW ^ TP_ERROR_MASK))
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so_error = ECONNABORTED;
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tp_indicate(T_DISCONNECT, $P, so_error);
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}
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tp_soisdisconnected($P);
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if ($P.tp_class != TP_CLASS_0) {
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if ($P.tp_state == TP_OPEN ) {
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tp_euntimeout($P, TM_data_retrans); /* all */
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tp_cuntimeout($P, TM_retrans);
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tp_cuntimeout($P, TM_inact);
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tp_cuntimeout($P, TM_sendack);
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$P.tp_flags &= ~TPF_DELACK;
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}
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tp_cuntimeout($P, TM_retrans);
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if( $$.e_sref != 0 )
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(void) tp_emit(DC_TPDU_type, $P, 0, 0, NULL);
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}
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}
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;
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SAME <== TP_CLOSED DR_TPDU
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DEFAULT
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{
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if( $$.e_sref != 0 )
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(void) tp_emit(DC_TPDU_type, $P, 0, 0, NULL);
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/* reference timer already set - reset it to be safe (???) */
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tp_euntimeout($P, TM_reference); /* all */
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tp_etimeout($P, TM_reference, (int)$P.tp_refer_ticks);
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}
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;
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/* NBS(34) */
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TP_REFWAIT <== TP_CRSENT ER_TPDU
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DEFAULT
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{
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tp_cuntimeout($P, TM_retrans);
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tp_indicate(ER_TPDU, $P, $$.e_reason);
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tp_soisdisconnected($P);
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}
|
|
;
|
|
|
|
/* NBS(27) */
|
|
TP_REFWAIT <== TP_CLOSING DR_TPDU
|
|
DEFAULT
|
|
{
|
|
tp_cuntimeout($P, TM_retrans);
|
|
tp_soisdisconnected($P);
|
|
}
|
|
;
|
|
/* these two transitions are the same but can't be combined because xebec
|
|
* can't handle the use of $$.e_reason if they're combined
|
|
*/
|
|
/* NBS(27) */
|
|
TP_REFWAIT <== TP_CLOSING ER_TPDU
|
|
DEFAULT
|
|
{
|
|
tp_indicate(ER_TPDU, $P, $$.e_reason);
|
|
tp_cuntimeout($P, TM_retrans);
|
|
tp_soisdisconnected($P);
|
|
}
|
|
;
|
|
/* NBS(27) */
|
|
TP_REFWAIT <== TP_CLOSING DC_TPDU
|
|
DEFAULT
|
|
{
|
|
tp_cuntimeout($P, TM_retrans);
|
|
tp_soisdisconnected($P);
|
|
}
|
|
;
|
|
|
|
/* NBS(21) */
|
|
SAME <== TP_CLOSED [ CC_TPDU, CR_TPDU ]
|
|
DEFAULT
|
|
{ /* don't ask me why we have to do this - spec says so */
|
|
(void) tp_emit(DR_TPDU_type, $P, 0, E_TP_NO_SESSION, NULL);
|
|
/* don't bother with retransmissions of the DR */
|
|
}
|
|
;
|
|
|
|
/* NBS(34) */
|
|
TP_REFWAIT <== TP_OPEN ER_TPDU
|
|
($P.tp_class == TP_CLASS_0)
|
|
{
|
|
tp_soisdisconnecting($P.tp_sock);
|
|
tp_indicate(ER_TPDU, $P, $$.e_reason);
|
|
tp_soisdisconnected($P);
|
|
tp_netcmd( $P, CONN_CLOSE );
|
|
}
|
|
;
|
|
|
|
TP_CLOSING <== [ TP_AKWAIT, TP_OPEN ] ER_TPDU
|
|
DEFAULT
|
|
{
|
|
if ($P.tp_state == TP_OPEN) {
|
|
tp_euntimeout($P, TM_data_retrans); /* all */
|
|
tp_cuntimeout($P, TM_inact);
|
|
tp_cuntimeout($P, TM_sendack);
|
|
}
|
|
tp_soisdisconnecting($P.tp_sock);
|
|
tp_indicate(ER_TPDU, $P, $$.e_reason);
|
|
$P.tp_retrans = $P.tp_Nretrans;
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_dr_ticks);
|
|
(void) tp_emit(DR_TPDU_type, $P, 0, E_TP_PROTO_ERR, NULL);
|
|
}
|
|
;
|
|
/* NBS(6) */
|
|
TP_OPEN <== TP_CRSENT CC_TPDU
|
|
($P.tp_class == TP_CLASS_0)
|
|
{
|
|
tp_cuntimeout($P, TM_retrans);
|
|
IncStat(ts_tp0_conn);
|
|
$P.tp_fcredit = 1;
|
|
soisconnected($P.tp_sock);
|
|
}
|
|
;
|
|
|
|
TP_OPEN <== TP_CRSENT CC_TPDU
|
|
DEFAULT
|
|
{
|
|
IFDEBUG(D_CONN)
|
|
printf("trans: CC_TPDU in CRSENT state flags 0x%x\n",
|
|
(int)$P.tp_flags);
|
|
ENDDEBUG
|
|
IncStat(ts_tp4_conn);
|
|
$P.tp_fref = $$.e_sref;
|
|
$P.tp_fcredit = $$.e_cdt;
|
|
if (($P.tp_rx_strat & TPRX_FASTSTART) && ($$.e_cdt > 0))
|
|
$P.tp_cong_win = $$.e_cdt * $P.tp_l_tpdusize;
|
|
tp_getoptions($P);
|
|
tp_cuntimeout($P, TM_retrans);
|
|
if ($P.tp_ucddata) {
|
|
IFDEBUG(D_CONN)
|
|
printf("dropping user connect data cc 0x%x\n",
|
|
$P.tp_ucddata->m_len);
|
|
ENDDEBUG
|
|
m_freem($P.tp_ucddata);
|
|
$P.tp_ucddata = 0;
|
|
}
|
|
soisconnected($P.tp_sock);
|
|
if ($$.e_datalen > 0) {
|
|
ASSERT($P.tp_Xrcv.sb_cc == 0); /* should be empty */
|
|
sbappendrecord(&$P.tp_Xrcv, $$.e_data);
|
|
$$.e_data = NULL;
|
|
}
|
|
|
|
(void) tp_emit(AK_TPDU_type, $P, $P.tp_rcvnxt, 0, NULL);
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_CRSENT TM_retrans
|
|
( $P.tp_retrans > 0 )
|
|
{
|
|
struct mbuf *data = NULL;
|
|
int error;
|
|
|
|
IncStat(ts_retrans_cr);
|
|
$P.tp_cong_win = 1 * $P.tp_l_tpdusize;
|
|
data = MCPY($P.tp_ucddata, M_NOWAIT);
|
|
if($P.tp_ucddata) {
|
|
IFDEBUG(D_CONN)
|
|
printf("TM_retrans.trans m_copy cc 0x%x\n", data);
|
|
dump_mbuf($P.tp_ucddata, "sosnd @ TM_retrans");
|
|
ENDDEBUG
|
|
if( data == NULL )
|
|
return ENOBUFS;
|
|
}
|
|
|
|
$P.tp_retrans --;
|
|
if( error = tp_emit(CR_TPDU_type, $P, 0, 0, data) ) {
|
|
$P.tp_sock->so_error = error;
|
|
}
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_cr_ticks);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
TP_REFWAIT <== TP_CRSENT TM_retrans
|
|
DEFAULT /* no more CR retransmissions */
|
|
{
|
|
IncStat(ts_conn_gaveup);
|
|
$P.tp_sock->so_error = ETIMEDOUT;
|
|
tp_indicate(T_DISCONNECT, $P, ETIMEDOUT);
|
|
tp_soisdisconnected($P);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_AKWAIT CR_TPDU
|
|
DEFAULT
|
|
/* duplicate CR (which doesn't really exist in the context of
|
|
* a connectionless network layer)
|
|
* Doesn't occur in class 0.
|
|
*/
|
|
{
|
|
int error;
|
|
struct mbuf *data = MCPY($P.tp_ucddata, M_WAIT);
|
|
|
|
if( error = tp_emit(CC_TPDU_type, $P, 0, 0, data) ) {
|
|
$P.tp_sock->so_error = error;
|
|
}
|
|
$P.tp_retrans = $P.tp_Nretrans;
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_cc_ticks);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
TP_OPEN <== TP_AKWAIT DT_TPDU
|
|
( IN_RWINDOW( $P, $$.e_seq,
|
|
$P.tp_rcvnxt, SEQ($P, $P.tp_rcvnxt + $P.tp_lcredit)) )
|
|
{
|
|
int doack;
|
|
|
|
/*
|
|
* Get rid of any confirm or connect data, so that if we
|
|
* crash or close, it isn't thought of as disconnect data.
|
|
*/
|
|
if ($P.tp_ucddata) {
|
|
m_freem($P.tp_ucddata);
|
|
$P.tp_ucddata = 0;
|
|
}
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
tp_cuntimeout($P, TM_retrans);
|
|
soisconnected($P.tp_sock);
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
|
|
/* see also next 2 transitions, if you make any changes */
|
|
|
|
doack = tp_stash($P, $E);
|
|
IFDEBUG(D_DATA)
|
|
printf("tp_stash returns %d\n",doack);
|
|
ENDDEBUG
|
|
|
|
if (doack) {
|
|
(void) tp_emit(AK_TPDU_type, $P, $P.tp_rcvnxt, 0, NULL );
|
|
tp_ctimeout($P, TM_sendack, (int)$P.tp_keepalive_ticks);
|
|
} else
|
|
tp_ctimeout( $P, TM_sendack, (int)$P.tp_sendack_ticks);
|
|
|
|
IFDEBUG(D_DATA)
|
|
printf("after stash calling sbwakeup\n");
|
|
ENDDEBUG
|
|
}
|
|
;
|
|
|
|
SAME <== TP_OPEN DT_TPDU
|
|
( $P.tp_class == TP_CLASS_0 )
|
|
{
|
|
tp0_stash($P, $E);
|
|
sbwakeup( &$P.tp_sock->so_rcv );
|
|
|
|
IFDEBUG(D_DATA)
|
|
printf("after stash calling sbwakeup\n");
|
|
ENDDEBUG
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_OPEN DT_TPDU
|
|
( IN_RWINDOW( $P, $$.e_seq,
|
|
$P.tp_rcvnxt, SEQ($P, $P.tp_rcvnxt + $P.tp_lcredit)) )
|
|
{
|
|
int doack; /* tells if we must ack immediately */
|
|
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
sbwakeup( &$P.tp_sock->so_rcv );
|
|
|
|
doack = tp_stash($P, $E);
|
|
IFDEBUG(D_DATA)
|
|
printf("tp_stash returns %d\n",doack);
|
|
ENDDEBUG
|
|
|
|
if(doack)
|
|
(void) tp_emit(AK_TPDU_type, $P, $P.tp_rcvnxt, 0, NULL );
|
|
else
|
|
tp_ctimeout_MIN( $P, TM_sendack, (int)$P.tp_sendack_ticks);
|
|
|
|
IFDEBUG(D_DATA)
|
|
printf("after stash calling sbwakeup\n");
|
|
ENDDEBUG
|
|
}
|
|
;
|
|
|
|
/* Not in window - we must ack under certain circumstances, namely
|
|
* a) if the seq number is below lwe but > lwe - (max credit ever given)
|
|
* (to handle lost acks) Can use max-possible-credit for this ^^^.
|
|
* and
|
|
* b) seq number is > uwe but < uwe + previously sent & withdrawn credit
|
|
*
|
|
* (see 12.2.3.8.1 of ISO spec, p. 73)
|
|
* We just always ack.
|
|
*/
|
|
/* TP4 only */
|
|
SAME <== [ TP_OPEN, TP_AKWAIT ] DT_TPDU
|
|
DEFAULT /* Not in window */
|
|
{
|
|
IFTRACE(D_DATA)
|
|
tptrace(TPPTmisc, "NIW seq rcvnxt lcredit ",
|
|
$$.e_seq, $P.tp_rcvnxt, $P.tp_lcredit, 0);
|
|
ENDTRACE
|
|
IncStat(ts_dt_niw);
|
|
m_freem($$.e_data);
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
(void) tp_emit(AK_TPDU_type, $P, $P.tp_rcvnxt, 0, NULL );
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
TP_OPEN <== TP_AKWAIT AK_TPDU
|
|
DEFAULT
|
|
{
|
|
if ($P.tp_ucddata) {
|
|
m_freem($P.tp_ucddata);
|
|
$P.tp_ucddata = 0;
|
|
}
|
|
(void) tp_goodack($P, $$.e_cdt, $$.e_seq, $$.e_subseq);
|
|
tp_cuntimeout($P, TM_retrans);
|
|
|
|
soisconnected($P.tp_sock);
|
|
IFTRACE(D_CONN)
|
|
struct socket *so = $P.tp_sock;
|
|
tptrace(TPPTmisc,
|
|
"called sosiconn: so so_state rcv.sb_sel rcv.sb_flags",
|
|
so, so->so_state, so->so_rcv.sb_sel, so->so_rcv.sb_flags);
|
|
tptrace(TPPTmisc,
|
|
"called sosiconn 2: so_qlen so_error so_rcv.sb_cc so_head",
|
|
so->so_qlen, so->so_error, so->so_rcv.sb_cc, so->so_head);
|
|
ENDTRACE
|
|
|
|
tp_ctimeout($P, TM_sendack, (int)$P.tp_keepalive_ticks);
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
TP_OPEN <== [ TP_OPEN, TP_AKWAIT ] XPD_TPDU
|
|
($P.tp_Xrcvnxt == $$.e_seq)
|
|
{
|
|
if( $P.tp_state == TP_AKWAIT ) {
|
|
if ($P.tp_ucddata) {
|
|
m_freem($P.tp_ucddata);
|
|
$P.tp_ucddata = 0;
|
|
}
|
|
tp_cuntimeout($P, TM_retrans);
|
|
soisconnected($P.tp_sock);
|
|
tp_ctimeout($P, TM_sendack, (int)$P.tp_keepalive_ticks);
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
}
|
|
IFTRACE(D_XPD)
|
|
tptrace(TPPTmisc, "XPD tpdu accepted Xrcvnxt, e_seq datalen m_len\n",
|
|
$P.tp_Xrcvnxt,$$.e_seq, $$.e_datalen, $$.e_data->m_len);
|
|
ENDTRACE
|
|
|
|
$P.tp_sock->so_state |= SS_RCVATMARK;
|
|
$$.e_data->m_flags |= M_EOR;
|
|
sbinsertoob(&$P.tp_Xrcv, $$.e_data);
|
|
IFDEBUG(D_XPD)
|
|
dump_mbuf($$.e_data, "XPD TPDU: tp_Xrcv");
|
|
ENDDEBUG
|
|
tp_indicate(T_XDATA, $P, 0);
|
|
sbwakeup( &$P.tp_Xrcv );
|
|
|
|
(void) tp_emit(XAK_TPDU_type, $P, $P.tp_Xrcvnxt, 0, NULL);
|
|
SEQ_INC($P, $P.tp_Xrcvnxt);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_OPEN T_USR_Xrcvd
|
|
DEFAULT
|
|
{
|
|
if( $P.tp_Xrcv.sb_cc == 0 ) {
|
|
/* kludge for select(): */
|
|
/* $P.tp_sock->so_state &= ~SS_OOBAVAIL; */
|
|
}
|
|
}
|
|
/* OLD WAY:
|
|
* Ack only after the user receives the XPD. This is better for
|
|
* users that use one XPD right after another.
|
|
* Acking right away (the NEW WAY, see the prev. transition) is
|
|
* better for occasional * XPD, when the receiving user doesn't
|
|
* want to read the XPD immediately (which is session's behavior).
|
|
*
|
|
int error = tp_emit(XAK_TPDU_type, $P, $P.tp_Xrcvnxt, 0, NULL);
|
|
SEQ_INC($P, $P.tp_Xrcvnxt);
|
|
return error;
|
|
*/
|
|
;
|
|
|
|
/* NOTE: presently if the user doesn't read the connection data
|
|
* before and expedited data PDU comes in, the connection data will
|
|
* be dropped. This is a bug. To avoid it, we need somewhere else
|
|
* to put the connection data.
|
|
* On the other hand, we need not to have it sitting around forever.
|
|
* This is a problem with the idea of trying to accommodate
|
|
* data on connect w/ a passive-open user interface.
|
|
*/
|
|
/* TP4 only */
|
|
|
|
SAME <== [ TP_AKWAIT, TP_OPEN ] XPD_TPDU
|
|
DEFAULT /* not in window or cdt==0 */
|
|
{
|
|
IFTRACE(D_XPD)
|
|
tptrace(TPPTmisc, "XPD tpdu niw (Xrcvnxt, e_seq) or not cdt (cc)\n",
|
|
$P.tp_Xrcvnxt, $$.e_seq, $P.tp_Xrcv.sb_cc , 0);
|
|
ENDTRACE
|
|
if( $P.tp_Xrcvnxt != $$.e_seq )
|
|
IncStat(ts_xpd_niw);
|
|
if( $P.tp_Xrcv.sb_cc ) {
|
|
/* might as well kick 'em again */
|
|
tp_indicate(T_XDATA, $P, 0);
|
|
IncStat(ts_xpd_dup);
|
|
}
|
|
m_freem($$.e_data);
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
/* don't send an xack because the xak gives "last one received", not
|
|
* "next one i expect" (dumb)
|
|
*/
|
|
}
|
|
;
|
|
|
|
/* Occurs (AKWAIT, OPEN) when parent (listening) socket gets aborted, and tries
|
|
* to detach all its "children"
|
|
* Also (CRSENT) when user kills a job that's doing a connect()
|
|
*/
|
|
TP_REFWAIT <== TP_CRSENT T_DETACH
|
|
($P.tp_class == TP_CLASS_0)
|
|
{
|
|
struct socket *so = $P.tp_sock;
|
|
|
|
/* detach from parent socket so it can finish closing */
|
|
if (so->so_head) {
|
|
if (!soqremque(so, 0) && !soqremque(so, 1))
|
|
panic("tp: T_DETACH");
|
|
so->so_head = 0;
|
|
}
|
|
tp_soisdisconnecting($P.tp_sock);
|
|
tp_netcmd( $P, CONN_CLOSE);
|
|
tp_soisdisconnected($P);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
TP_CLOSING <== [ TP_CLOSING, TP_AKWAIT, TP_CRSENT, TP_CONFIRMING ] T_DETACH
|
|
DEFAULT
|
|
{
|
|
struct socket *so = $P.tp_sock;
|
|
struct mbuf *data = NULL;
|
|
|
|
/* detach from parent socket so it can finish closing */
|
|
if (so->so_head) {
|
|
if (!soqremque(so, 0) && !soqremque(so, 1))
|
|
panic("tp: T_DETACH");
|
|
so->so_head = 0;
|
|
}
|
|
if ($P.tp_state != TP_CLOSING) {
|
|
tp_soisdisconnecting($P.tp_sock);
|
|
data = MCPY($P.tp_ucddata, M_NOWAIT);
|
|
(void) tp_emit(DR_TPDU_type, $P, 0, E_TP_NORMAL_DISC, data);
|
|
$P.tp_retrans = $P.tp_Nretrans;
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_dr_ticks);
|
|
}
|
|
}
|
|
;
|
|
|
|
TP_REFWAIT <== [ TP_OPEN, TP_CRSENT ] T_DISC_req
|
|
( $P.tp_class == TP_CLASS_0 )
|
|
{
|
|
tp_soisdisconnecting($P.tp_sock);
|
|
tp_netcmd( $P, CONN_CLOSE);
|
|
tp_soisdisconnected($P);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
TP_CLOSING <== [ TP_AKWAIT, TP_OPEN, TP_CRSENT, TP_CONFIRMING ] T_DISC_req
|
|
DEFAULT
|
|
{
|
|
struct mbuf *data = MCPY($P.tp_ucddata, M_WAIT);
|
|
|
|
if($P.tp_state == TP_OPEN) {
|
|
tp_euntimeout($P, TM_data_retrans); /* all */
|
|
tp_cuntimeout($P, TM_inact);
|
|
tp_cuntimeout($P, TM_sendack);
|
|
$P.tp_flags &= ~TPF_DELACK;
|
|
}
|
|
if (data) {
|
|
IFDEBUG(D_CONN)
|
|
printf("T_DISC_req.trans tp_ucddata 0x%x\n",
|
|
$P.tp_ucddata);
|
|
dump_mbuf(data, "ucddata @ T_DISC_req");
|
|
ENDDEBUG
|
|
}
|
|
tp_soisdisconnecting($P.tp_sock);
|
|
$P.tp_retrans = $P.tp_Nretrans;
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_dr_ticks);
|
|
|
|
if( trick_hc )
|
|
return tp_emit(DR_TPDU_type, $P, 0, $$.e_reason, data);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_AKWAIT TM_retrans
|
|
( $P.tp_retrans > 0 )
|
|
{
|
|
int error;
|
|
struct mbuf *data = MCPY($P.tp_ucddata, M_WAIT);
|
|
|
|
IncStat(ts_retrans_cc);
|
|
$P.tp_retrans --;
|
|
$P.tp_cong_win = 1 * $P.tp_l_tpdusize;
|
|
|
|
if( error = tp_emit(CC_TPDU_type, $P, 0, 0, data) )
|
|
$P.tp_sock->so_error = error;
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_cc_ticks);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
TP_CLOSING <== TP_AKWAIT TM_retrans
|
|
DEFAULT /* out of time */
|
|
{
|
|
IncStat(ts_conn_gaveup);
|
|
tp_soisdisconnecting($P.tp_sock);
|
|
$P.tp_sock->so_error = ETIMEDOUT;
|
|
tp_indicate(T_DISCONNECT, $P, ETIMEDOUT);
|
|
(void) tp_emit(DR_TPDU_type, $P, 0, E_TP_CONGEST, NULL);
|
|
$P.tp_retrans = $P.tp_Nretrans;
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_dr_ticks);
|
|
}
|
|
;
|
|
|
|
/* the retrans timers had better go off BEFORE the inactivity timer does,
|
|
* if transmissions are going on.
|
|
* (i.e., TM_inact should be greater than timer for all retrans plus ack
|
|
* turnaround)
|
|
*/
|
|
/* TP4 only */
|
|
TP_CLOSING <== TP_OPEN [ TM_inact, TM_retrans, TM_data_retrans ]
|
|
DEFAULT
|
|
{
|
|
tp_euntimeout($P, TM_data_retrans); /* all */
|
|
tp_cuntimeout($P, TM_inact);
|
|
tp_cuntimeout($P, TM_sendack);
|
|
|
|
IncStat(ts_conn_gaveup);
|
|
tp_soisdisconnecting($P.tp_sock);
|
|
$P.tp_sock->so_error = ETIMEDOUT;
|
|
tp_indicate(T_DISCONNECT, $P, ETIMEDOUT);
|
|
(void) tp_emit(DR_TPDU_type, $P, 0, E_TP_CONGEST_2, NULL);
|
|
$P.tp_retrans = $P.tp_Nretrans;
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_dr_ticks);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_OPEN TM_retrans
|
|
( $P.tp_retrans > 0 )
|
|
{
|
|
$P.tp_cong_win = 1 * $P.tp_l_tpdusize;
|
|
/* resume XPD */
|
|
if ( $P.tp_Xsnd.sb_mb ) {
|
|
struct mbuf *m = m_copy($P.tp_Xsnd.sb_mb, 0, (int)$P.tp_Xsnd.sb_cc);
|
|
int shift;
|
|
|
|
IFTRACE(D_XPD)
|
|
tptrace(TPPTmisc, "XPD retrans: Xuna Xsndnxt sndnxt snduna",
|
|
$P.tp_Xuna, $P.tp_Xsndnxt, $P.tp_sndnxt,
|
|
$P.tp_snduna);
|
|
ENDTRACE
|
|
IFDEBUG(D_XPD)
|
|
dump_mbuf(m, "XPD retrans emitting M");
|
|
ENDDEBUG
|
|
IncStat(ts_retrans_xpd);
|
|
$P.tp_retrans --;
|
|
shift = max($P.tp_Nretrans - $P.tp_retrans, 6);
|
|
(void) tp_emit(XPD_TPDU_type, $P, $P.tp_Xuna, 1, m);
|
|
tp_ctimeout($P, TM_retrans, ((int)$P.tp_dt_ticks) << shift);
|
|
}
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_OPEN TM_data_retrans
|
|
($P.tp_rxtshift < TP_NRETRANS)
|
|
{
|
|
$P.tp_rxtshift++;
|
|
(void) tp_data_retrans($P);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_CLOSING TM_retrans
|
|
( $P.tp_retrans > 0 )
|
|
{
|
|
$P.tp_retrans --;
|
|
(void) tp_emit(DR_TPDU_type, $P, 0, E_TP_DR_NO_REAS, NULL);
|
|
IncStat(ts_retrans_dr);
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_dr_ticks);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
TP_REFWAIT <== TP_CLOSING TM_retrans
|
|
DEFAULT /* no more retrans - gave up */
|
|
{
|
|
$P.tp_sock->so_error = ETIMEDOUT;
|
|
$P.tp_refstate = REF_FROZEN;
|
|
tp_recycle_tsuffix( $P );
|
|
tp_etimeout($P, TM_reference, (int)$P.tp_refer_ticks);
|
|
}
|
|
;
|
|
|
|
/*
|
|
* The resources are kept around until the ref timer goes off.
|
|
* The suffixes are wiped out sooner so they can be reused right away.
|
|
*/
|
|
/* applicable in TP4, TP0 */
|
|
TP_CLOSED <== TP_REFWAIT TM_reference
|
|
DEFAULT
|
|
{
|
|
tp_freeref($P.tp_lref);
|
|
tp_detach($P);
|
|
}
|
|
;
|
|
|
|
/* applicable in TP4, TP0 */
|
|
/* A duplicate CR from connectionless network layer can't happen */
|
|
SAME <== TP_OPEN [ CR_TPDU, CC_TPDU ]
|
|
DEFAULT
|
|
{
|
|
if( $P.tp_class != TP_CLASS_0) {
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
if ( $E.ev_number == CC_TPDU )
|
|
(void) tp_emit(AK_TPDU_type, $P, $P.tp_rcvnxt, 0, NULL);
|
|
}
|
|
/* ignore it if class 0 - state tables are blank for this */
|
|
}
|
|
;
|
|
|
|
/* applicable in TP4, TP0 */
|
|
SAME <== TP_OPEN T_DATA_req
|
|
DEFAULT
|
|
{
|
|
IFTRACE(D_DATA)
|
|
tptrace(TPPTmisc, "T_DATA_req sndnxt snduna fcredit, tpcb",
|
|
$P.tp_sndnxt, $P.tp_snduna, $P.tp_fcredit, $P);
|
|
ENDTRACE
|
|
|
|
tp_send($P);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_OPEN T_XPD_req
|
|
DEFAULT
|
|
/* T_XPD_req was issued by sosend iff xpd socket buf was empty
|
|
* at time of sosend(),
|
|
* AND (which means) there were no unacknowledged XPD tpdus outstanding!
|
|
*/
|
|
{
|
|
int error = 0;
|
|
|
|
/* resume XPD */
|
|
if ( $P.tp_Xsnd.sb_mb ) {
|
|
struct mbuf *m = m_copy($P.tp_Xsnd.sb_mb, 0, (int)$P.tp_Xsnd.sb_cc);
|
|
/* m_copy doesn't preserve the m_xlink field, but at this pt.
|
|
* that doesn't matter
|
|
*/
|
|
|
|
IFTRACE(D_XPD)
|
|
tptrace(TPPTmisc, "XPD req: Xuna Xsndnxt sndnxt snduna",
|
|
$P.tp_Xuna, $P.tp_Xsndnxt, $P.tp_sndnxt,
|
|
$P.tp_snduna);
|
|
ENDTRACE
|
|
IFDEBUG(D_XPD)
|
|
printf("T_XPD_req: sb_cc 0x%x\n", $P.tp_Xsnd.sb_cc);
|
|
dump_mbuf(m, "XPD req emitting M");
|
|
ENDDEBUG
|
|
error =
|
|
tp_emit(XPD_TPDU_type, $P, $P.tp_Xuna, 1, m);
|
|
$P.tp_retrans = $P.tp_Nretrans;
|
|
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_rxtcur);
|
|
SEQ_INC($P, $P.tp_Xsndnxt);
|
|
}
|
|
if(trick_hc)
|
|
return error;
|
|
}
|
|
;
|
|
|
|
/* TP4, faked ack in TP0 when cons send completes */
|
|
SAME <== TP_OPEN AK_TPDU
|
|
( tp_goodack($P, $$.e_cdt, $$.e_seq, $$.e_subseq) )
|
|
|
|
/* tp_goodack == true means
|
|
* EITHER it actually acked something heretofore unacknowledged
|
|
* OR no news but the credit should be processed.
|
|
*/
|
|
{
|
|
struct sockbuf *sb = &$P.tp_sock->so_snd;
|
|
|
|
IFDEBUG(D_ACKRECV)
|
|
printf("GOOD ACK seq 0x%x cdt 0x%x\n", $$.e_seq, $$.e_cdt);
|
|
ENDDEBUG
|
|
if( $P.tp_class != TP_CLASS_0) {
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
}
|
|
sbwakeup(sb);
|
|
IFDEBUG(D_ACKRECV)
|
|
printf("GOOD ACK new sndnxt 0x%x\n", $P.tp_sndnxt);
|
|
ENDDEBUG
|
|
}
|
|
;
|
|
|
|
/* TP4, and TP0 after sending a CC or possibly a CR */
|
|
SAME <== TP_OPEN AK_TPDU
|
|
DEFAULT
|
|
{
|
|
IFTRACE(D_ACKRECV)
|
|
tptrace(TPPTmisc, "BOGUS ACK fcc_present, tp_r_subseq e_subseq",
|
|
$$.e_fcc_present, $P.tp_r_subseq, $$.e_subseq, 0);
|
|
ENDTRACE
|
|
if( $P.tp_class != TP_CLASS_0 ) {
|
|
|
|
if ( !$$.e_fcc_present ) {
|
|
/* send ACK with FCC */
|
|
IncStat( ts_ackreason[_ACK_FCC_] );
|
|
(void) tp_emit(AK_TPDU_type, $P, $P.tp_rcvnxt, 1, NULL);
|
|
}
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
}
|
|
}
|
|
;
|
|
|
|
/* NBS(47) */
|
|
/* goes in at *** */
|
|
/* just so happens that this is never true now, because we allow
|
|
* only 1 packet in the queue at once (this could be changed)
|
|
if ( $P.tp_Xsnd.sb_mb ) {
|
|
struct mbuf *m = m_copy($P.tp_Xsnd.sb_mb, 0, ??);
|
|
|
|
(void) tp_emit(XPD_TPDU_type, $P, $P.tp_Xuna, 1, m);
|
|
$P.tp_retrans = $P.tp_Nretrans;
|
|
tp_ctimeout($P, TM_retrans, (int)$P.tp_xpd_ticks);
|
|
SEQ_INC($P, $P.tp_Xsndnxt);
|
|
}
|
|
*/
|
|
/* end of the above hack */
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_OPEN XAK_TPDU
|
|
( tp_goodXack($P, $$.e_seq) )
|
|
/* tp_goodXack checks for good ack, removes the correct
|
|
* tpdu from the queue and returns 1 if ack was legit, 0 if not.
|
|
* also updates tp_Xuna
|
|
*/
|
|
{
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
tp_cuntimeout($P, TM_retrans);
|
|
|
|
sbwakeup( &$P.tp_sock->so_snd );
|
|
|
|
/* resume normal data */
|
|
tp_send($P);
|
|
}
|
|
;
|
|
|
|
/* TP4, and TP0 after sending a CC or possibly a CR */
|
|
SAME <== TP_OPEN XAK_TPDU
|
|
DEFAULT
|
|
{
|
|
IFTRACE(D_ACKRECV)
|
|
tptrace(TPPTmisc, "BOGUS XACK eventtype ", $E.ev_number, 0, 0,0);
|
|
ENDTRACE
|
|
if( $P.tp_class != TP_CLASS_0 ) {
|
|
tp_ctimeout($P, TM_inact, (int)$P.tp_inact_ticks);
|
|
}
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
SAME <== TP_OPEN TM_sendack
|
|
DEFAULT
|
|
{
|
|
int timo;
|
|
IFTRACE(D_TIMER)
|
|
tptrace(TPPTsendack, -1, $P.tp_lcredit, $P.tp_sent_uwe,
|
|
$P.tp_sent_lcdt, 0);
|
|
ENDTRACE
|
|
IncPStat($P, tps_n_TMsendack);
|
|
(void) tp_emit(AK_TPDU_type, $P, $P.tp_rcvnxt, 0, NULL);
|
|
if ($P.tp_fcredit == 0) {
|
|
if ($P.tp_rxtshift < TP_MAXRXTSHIFT)
|
|
$P.tp_rxtshift++;
|
|
timo = ($P.tp_dt_ticks) << $P.tp_rxtshift;
|
|
} else
|
|
timo = $P.tp_sendack_ticks;
|
|
tp_ctimeout($P, TM_sendack, timo);
|
|
}
|
|
;
|
|
|
|
/* TP0 only */
|
|
SAME <== TP_OPEN T_USR_rcvd
|
|
($P.tp_class == TP_CLASS_0)
|
|
{
|
|
if (sbspace(&$P.tp_sock->so_rcv) > 0)
|
|
tp0_openflow($P);
|
|
}
|
|
;
|
|
|
|
/* TP4 only */
|
|
/* If old credit was zero,
|
|
* we'd better inform other side that we now have space
|
|
* But this is not enough. Sender might not yet have
|
|
* seen an ack with cdt 0 but it might still think the
|
|
* window is closed, so it's going to wait.
|
|
* Best to send an ack each time.
|
|
* Strictly speaking, this ought to be a function of the
|
|
* general ack strategy.
|
|
*/
|
|
SAME <== TP_OPEN T_USR_rcvd
|
|
DEFAULT
|
|
{
|
|
if( trick_hc ) {
|
|
SeqNum ack_thresh;
|
|
/*
|
|
* If the upper window edge has advanced a reasonable
|
|
* amount beyond what was known, send an ACK.
|
|
* A reasonable amount is 2 packets, unless the max window
|
|
* is only 1 or 2 packets, in which case we
|
|
* should send an ack for any advance in the upper window edge.
|
|
*/
|
|
LOCAL_CREDIT($P);
|
|
ack_thresh = SEQ_SUB($P, $P.tp_lcredit + $P.tp_rcvnxt,
|
|
($P.tp_maxlcredit > 2 ? 2 : 1));
|
|
if (SEQ_GT($P, ack_thresh, $P.tp_sent_uwe)) {
|
|
IncStat(ts_ackreason[_ACK_USRRCV_]);
|
|
$P.tp_flags &= ~TPF_DELACK;
|
|
return tp_emit(AK_TPDU_type, $P, $P.tp_rcvnxt, 0, NULL);
|
|
}
|
|
}
|
|
}
|
|
;
|
|
|
|
/* applicable in TP4, TP0 */
|
|
SAME <== TP_REFWAIT [ T_USR_rcvd, T_USR_Xrcvd ]
|
|
DEFAULT
|
|
/* This happens if other end sent a DR when the user was waiting
|
|
* on a receive.
|
|
* Processing the DR includes putting us in REFWAIT state.
|
|
*/
|
|
{
|
|
if(trick_hc)
|
|
return ECONNABORTED;
|
|
}
|
|
;
|
|
|
|
/* TP0 only */
|
|
TP_REFWAIT <== [ TP_OPEN, TP_CRSENT, TP_LISTENING ] T_NETRESET
|
|
( $P.tp_class != TP_CLASS_4 )
|
|
/* 0 or (4 and 0) */
|
|
/* in OPEN class will be 0 or 4 but not both */
|
|
/* in CRSENT or LISTENING it could be in negotiation, hence both */
|
|
/* Actually, this shouldn't ever happen in LISTENING */
|
|
{
|
|
ASSERT( $P.tp_state != TP_LISTENING );
|
|
tp_indicate(T_DISCONNECT, $P, ECONNRESET);
|
|
tp_soisdisconnected($P);
|
|
}
|
|
;
|
|
|
|
/* TP4: ignore resets */
|
|
SAME <== [ TP_OPEN, TP_CRSENT, TP_AKWAIT,
|
|
TP_CLOSING, TP_LISTENING ] T_NETRESET
|
|
DEFAULT
|
|
NULLACTION
|
|
;
|
|
|
|
/* applicable in TP4, TP0 */
|
|
SAME <== [ TP_CLOSED, TP_REFWAIT ] T_NETRESET
|
|
DEFAULT
|
|
NULLACTION
|
|
;
|
|
|
|
/* C'EST TOUT */
|