375 lines
14 KiB
C
375 lines
14 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 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
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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_pcb.h 7.9 (Berkeley) 5/6/91
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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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* ARGO TP
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*
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* $Header: /cvsroot/src/sys/netiso/Attic/tp_pcb.h,v 1.1 1993/04/09 12:01:44 cgd Exp $
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* $Source: /cvsroot/src/sys/netiso/Attic/tp_pcb.h,v $
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*
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*
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* This file defines the transport protocol control block (tpcb).
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* and a bunch of #define values that are used in the tpcb.
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*/
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#ifndef __TP_PCB__
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#define __TP_PCB__
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#include "../netiso/tp_param.h"
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#include "../netiso/tp_timer.h"
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#include "../netiso/tp_user.h"
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#ifndef sblock
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#include "socketvar.h"
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#endif sblock
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/* NOTE: the code depends on REF_CLOSED > REF_OPEN > the rest, and
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* on REF_FREE being zero
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*
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* Possible improvement:
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* think about merging the tp_ref w/ the tpcb and doing a search
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* through the tpcb list, from tpb. This would slow down lookup
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* during data transfer
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* It would be a little nicer also to have something based on the
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* clock (like top n bits of the reference is part of the clock, to
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* minimize the likelihood of reuse after a crash)
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* also, need to keep the timer servicing part to a minimum (although
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* the cost of this is probably independent of whether the timers are
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* in the pcb or in an array..
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* Last, would have to make the number of timers a function of the amount of
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* mbufs available, plus some for the frozen references.
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*
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* Possible improvement:
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* Might not need the ref_state stuff either...
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* REF_FREE could correspond to tp_state == CLOSED or nonexistend tpcb,
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* REF_OPEN to tp_state anywhere from AK_WAIT or CR_SENT to CLOSING
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* REF_OPENING could correspond to LISTENING, because that's the
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* way it's used, not because the correspondence is exact.
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* REF_CLOSED could correspond to REFWAIT
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*/
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#define REF_FROZEN 3 /* has ref timer only */
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#define REF_OPEN 2 /* has timers, possibly active */
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#define REF_OPENING 1 /* in use (has a pcb) but no timers */
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#define REF_FREE 0 /* free to reallocate */
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#define N_CTIMERS 4
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#define N_ETIMERS 2
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struct tp_ref {
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u_char tpr_state; /* values REF_FROZEN, etc. above */
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struct Ccallout tpr_callout[N_CTIMERS]; /* C timers */
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struct Ecallout tpr_calltodo; /* list of active E timers */
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struct tp_pcb *tpr_pcb; /* back ptr to PCB */
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};
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struct tp_param {
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/* PER system stuff (one static structure instead of a bunch of names) */
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unsigned tpp_configed:1; /* Has TP been initialized? */
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};
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/*
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* retransmission control and performance measurement
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*/
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struct tp_rtc {
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struct tp_rtc *tprt_next; /* ptr to next rtc structure in the list */
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SeqNum tprt_seq; /* seq # of this TPDU */
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int tprt_eot; /* Will this TPDU have the eot bit set? */
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int tprt_octets;/* # octets in this TPDU */
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struct mbuf *tprt_data; /* ptr to the octets of data */
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};
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struct nl_protosw {
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int nlp_afamily; /* address family */
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int (*nlp_putnetaddr)(); /* puts addresses in nl pcb */
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int (*nlp_getnetaddr)(); /* gets addresses from nl pcb */
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int (*nlp_cmpnetaddr)(); /* compares address in pcb with sockaddr */
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int (*nlp_putsufx)(); /* puts transport suffixes in nl pcb */
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int (*nlp_getsufx)(); /* gets transport suffixes from nl pcb */
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int (*nlp_recycle_suffix)();/* clears suffix from nl pcb */
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int (*nlp_mtu)(); /* figures out mtu based on nl used */
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int (*nlp_pcbbind)(); /* bind to pcb for net level */
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int (*nlp_pcbconn)(); /* connect for net level */
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int (*nlp_pcbdisc)(); /* disconnect net level */
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int (*nlp_pcbdetach)(); /* detach net level pcb */
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int (*nlp_pcballoc)(); /* allocate a net level pcb */
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int (*nlp_output)(); /* prepare a packet to give to nl */
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int (*nlp_dgoutput)(); /* prepare a packet to give to nl */
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int (*nlp_ctloutput)(); /* hook for network set/get options */
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caddr_t nlp_pcblist; /* list of xx_pcb's for connections */
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};
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struct tp_pcb {
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struct tp_pcb *tp_next;
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struct tp_pcb *tp_prev;
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struct tp_pcb *tp_nextlisten; /* chain all listeners */
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u_short tp_state; /* state of fsm */
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short tp_retrans; /* # times can still retrans */
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struct tp_ref *tp_refp; /* rest of pcb */
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caddr_t tp_npcb; /* to lower layer pcb */
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struct nl_protosw *tp_nlproto; /* lower-layer dependent routines */
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struct socket *tp_sock; /* back ptr */
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RefNum tp_lref; /* local reference */
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RefNum tp_fref; /* foreign reference */
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u_int tp_seqmask; /* mask for seq space */
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u_int tp_seqbit; /* bit for seq number wraparound */
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u_int tp_seqhalf; /* half the seq space */
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/* credit & sequencing info for SENDING */
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u_short tp_fcredit; /* current remote credit in # packets */
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u_short tp_cong_win; /* congestion window : set to 1 on
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* source quench
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* Minimizes the amount of retrans-
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* missions (independently of the
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* retrans strategy). Increased
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* by one for each good ack received.
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* Minimizes the amount sent in a
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* regular tp_send() also.
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*/
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u_int tp_ackrcvd; /* ACKs received since the send window was updated */
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SeqNum tp_last_retrans;
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SeqNum tp_retrans_hiwat;
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SeqNum tp_snduna; /* seq # of lowest unacked DT */
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struct tp_rtc *tp_snduna_rtc; /* lowest unacked stuff sent so far */
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SeqNum tp_sndhiwat; /* highest seq # sent so far */
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struct tp_rtc *tp_sndhiwat_rtc; /* last stuff sent so far */
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int tp_Nwindow; /* for perf. measurement */
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struct mbuf *tp_ucddata; /* user connect/disconnect data */
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/* credit & sequencing info for RECEIVING */
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SeqNum tp_sent_lcdt; /* cdt according to last ack sent */
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SeqNum tp_sent_uwe; /* uwe according to last ack sent */
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SeqNum tp_sent_rcvnxt; /* rcvnxt according to last ack sent
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* needed for perf measurements only
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*/
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u_short tp_lcredit; /* current local credit in # packets */
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SeqNum tp_rcvnxt; /* next DT seq # expect to recv */
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struct tp_rtc *tp_rcvnxt_rtc; /* unacked stuff recvd out of order */
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/* receiver congestion state stuff ... */
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u_int tp_win_recv;
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/* receive window as a scaled int (8 bit fraction part) */
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struct cong_sample {
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ushort cs_size; /* current window size */
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ushort cs_received; /* PDUs received in this sample */
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ushort cs_ce_set; /* PDUs received in this sample with CE bit set */
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} tp_cong_sample;
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/* parameters per-connection controllable by user */
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struct tp_conn_param _tp_param;
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#define tp_Nretrans _tp_param.p_Nretrans
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#define tp_dr_ticks _tp_param.p_dr_ticks
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#define tp_cc_ticks _tp_param.p_cc_ticks
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#define tp_dt_ticks _tp_param.p_dt_ticks
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#define tp_xpd_ticks _tp_param.p_x_ticks
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#define tp_cr_ticks _tp_param.p_cr_ticks
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#define tp_keepalive_ticks _tp_param.p_keepalive_ticks
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#define tp_sendack_ticks _tp_param.p_sendack_ticks
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#define tp_refer_ticks _tp_param.p_ref_ticks
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#define tp_inact_ticks _tp_param.p_inact_ticks
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#define tp_xtd_format _tp_param.p_xtd_format
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#define tp_xpd_service _tp_param.p_xpd_service
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#define tp_ack_strat _tp_param.p_ack_strat
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#define tp_rx_strat _tp_param.p_rx_strat
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#define tp_use_checksum _tp_param.p_use_checksum
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#define tp_use_efc _tp_param.p_use_efc
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#define tp_use_nxpd _tp_param.p_use_nxpd
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#define tp_use_rcc _tp_param.p_use_rcc
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#define tp_tpdusize _tp_param.p_tpdusize
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#define tp_class _tp_param.p_class
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#define tp_winsize _tp_param.p_winsize
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#define tp_no_disc_indications _tp_param.p_no_disc_indications
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#define tp_dont_change_params _tp_param.p_dont_change_params
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#define tp_netservice _tp_param.p_netservice
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#define tp_version _tp_param.p_version
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int tp_l_tpdusize;
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/* whereas tp_tpdusize is log2(the negotiated max size)
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* l_tpdusize is the size we'll use when sending, in # chars
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*/
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struct timeval tp_rtv; /* max round-trip time variance */
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struct timeval tp_rtt; /* smoothed round-trip time */
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struct timeval tp_rttemit[ TP_RTT_NUM + 1 ];
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/* times that the last TP_RTT_NUM DT_TPDUs were emitted */
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unsigned
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tp_sendfcc:1, /* shall next ack include FCC parameter? */
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tp_trace:1, /* is this pcb being traced? (not used yet) */
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tp_perf_on:1, /* 0/1 -> performance measuring on */
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tp_reneged:1, /* have we reneged on cdt since last ack? */
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tp_decbit:3, /* dec bit was set, we're in reneg mode */
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tp_cebit_off:1, /* the real DEC bit algorithms not in use */
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tp_flags:8, /* values: */
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#define TPF_CONN_DATA_OUT TPFLAG_CONN_DATA_OUT
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#define TPF_CONN_DATA_IN TPFLAG_CONN_DATA_IN
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#define TPF_DISC_DATA_IN TPFLAG_DISC_DATA_IN
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#define TPF_DISC_DATA_OUT TPFLAG_DISC_DATA_OUT
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#define TPF_XPD_PRESENT TPFLAG_XPD_PRESENT
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#define TPF_NLQOS_PDN TPFLAG_NLQOS_PDN
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#define TPF_PEER_ON_SAMENET TPFLAG_PEER_ON_SAMENET
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#define PEER_IS_LOCAL(t) \
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(((t)->tp_flags & TPF_PEER_ON_SAME_NET)==TPF_PEER_ON_SAME_NET)
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#define USES_PDN(t) \
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(((t)->tp_flags & TPF_NLQOS_PDN)==TPF_NLQOS_PDN)
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tp_unused:16;
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#ifdef TP_PERF_MEAS
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/* performance stats - see tp_stat.h */
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struct tp_pmeas *tp_p_meas;
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struct mbuf *tp_p_mbuf;
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#endif TP_PERF_MEAS
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/* addressing */
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u_short tp_domain; /* domain (INET, ISO) */
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/* for compatibility with the *old* way and with INET, be sure that
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* that lsuffix and fsuffix are aligned to a short addr.
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* having them follow the u_short *suffixlen should suffice (choke)
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*/
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u_short tp_fsuffixlen; /* foreign suffix */
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char tp_fsuffix[MAX_TSAP_SEL_LEN];
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u_short tp_lsuffixlen; /* local suffix */
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char tp_lsuffix[MAX_TSAP_SEL_LEN];
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#define SHORT_LSUFXP(tpcb) ((short *)((tpcb)->tp_lsuffix))
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#define SHORT_FSUFXP(tpcb) ((short *)((tpcb)->tp_fsuffix))
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u_char tp_vers; /* protocol version */
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u_char tp_peer_acktime; /* used to compute DT retrans time */
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struct sockbuf tp_Xsnd; /* for expedited data */
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/* struct sockbuf tp_Xrcv; /* for expedited data */
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#define tp_Xrcv tp_sock->so_rcv
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SeqNum tp_Xsndnxt; /* next XPD seq # to send */
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SeqNum tp_Xuna; /* seq # of unacked XPD */
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SeqNum tp_Xrcvnxt; /* next XPD seq # expect to recv */
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/* AK subsequencing */
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u_short tp_s_subseq; /* next subseq to send */
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u_short tp_r_subseq; /* highest recv subseq */
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};
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u_int tp_start_win;
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#define ROUND(scaled_int) (((scaled_int) >> 8) + (((scaled_int) & 0x80) ? 1:0))
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/* to round off a scaled int with an 8 bit fraction part */
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#define CONG_INIT_SAMPLE(pcb) \
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pcb->tp_cong_sample.cs_received = \
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pcb->tp_cong_sample.cs_ce_set = 0; \
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pcb->tp_cong_sample.cs_size = MAX(pcb->tp_lcredit, 1) << 1;
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#define CONG_UPDATE_SAMPLE(pcb, ce_bit) \
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pcb->tp_cong_sample.cs_received++; \
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if (ce_bit) { \
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pcb->tp_cong_sample.cs_ce_set++; \
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} \
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if (pcb->tp_cong_sample.cs_size <= pcb->tp_cong_sample.cs_received) { \
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if ((pcb->tp_cong_sample.cs_ce_set << 1) >= \
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pcb->tp_cong_sample.cs_size ) { \
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pcb->tp_win_recv -= pcb->tp_win_recv >> 3; /* multiply by .875 */ \
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pcb->tp_win_recv = MAX(1 << 8, pcb->tp_win_recv); \
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} \
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else { \
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pcb->tp_win_recv += (1 << 8); /* add one to the scaled int */ \
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} \
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pcb->tp_lcredit = ROUND(pcb->tp_win_recv); \
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CONG_INIT_SAMPLE(pcb); \
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}
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#define CONG_ACK(pcb, seq) \
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{ int newacks = SEQ_SUB(pcb, seq, pcb->tp_snduna); \
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if (newacks > 0) { \
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pcb->tp_ackrcvd += newacks; \
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if (pcb->tp_ackrcvd >= MIN(pcb->tp_fcredit, pcb->tp_cong_win)) { \
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++pcb->tp_cong_win; \
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pcb->tp_ackrcvd = 0; \
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} \
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} \
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}
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#ifdef KERNEL
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extern struct timeval time;
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extern struct tp_ref *tp_ref;
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extern struct tp_param tp_param;
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extern struct nl_protosw nl_protosw[];
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extern struct tp_pcb *tp_listeners;
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extern struct tp_pcb *tp_intercepts;
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#endif
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#define sototpcb(so) ((struct tp_pcb *)(so->so_tpcb))
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#define sototpref(so) ((struct tp_ref *)((so)->so_tpcb->tp_ref))
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#define tpcbtoso(tp) ((struct socket *)((tp)->tp_sock))
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#define tpcbtoref(tp) ((struct tp_ref *)((tp)->tp_ref))
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#endif __TP_PCB__
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