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BSD 4_4_Lite2 release
[unix-history] / usr / src / sys / netiso / tp_pcb.h
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)tp_pcb.h 8.2 (Berkeley) 9/22/94
*/
/***********************************************************
Copyright IBM Corporation 1987
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation, and that the name of IBM not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
******************************************************************/
/*
* ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
*/
/*
* ARGO TP
*
* $Header: tp_pcb.h,v 5.2 88/11/18 17:09:32 nhall Exp $
* $Source: /usr/argo/sys/netiso/RCS/tp_pcb.h,v $
*
*
* This file defines the transport protocol control block (tpcb).
* and a bunch of #define values that are used in the tpcb.
*/
#ifndef __TP_PCB__
#define __TP_PCB__
#include <netiso/tp_param.h>
#include <netiso/tp_timer.h>
#include <netiso/tp_user.h>
#ifndef sblock
#include <sys/socketvar.h>
#endif /* sblock */
/* NOTE: the code depends on REF_CLOSED > REF_OPEN > the rest, and
* on REF_FREE being zero
*
* Possible improvement:
* think about merging the tp_ref w/ the tpcb and doing a search
* through the tpcb list, from tpb. This would slow down lookup
* during data transfer
* It would be a little nicer also to have something based on the
* clock (like top n bits of the reference is part of the clock, to
* minimize the likelihood of reuse after a crash)
* also, need to keep the timer servicing part to a minimum (although
* the cost of this is probably independent of whether the timers are
* in the pcb or in an array..
* Last, would have to make the number of timers a function of the amount of
* mbufs available, plus some for the frozen references.
*
* Possible improvement:
* Might not need the ref_state stuff either...
* REF_FREE could correspond to tp_state == CLOSED or nonexistend tpcb,
* REF_OPEN to tp_state anywhere from AK_WAIT or CR_SENT to CLOSING
* REF_OPENING could correspond to LISTENING, because that's the
* way it's used, not because the correspondence is exact.
* REF_CLOSED could correspond to REFWAIT
*/
#define REF_FROZEN 3 /* has ref timer only */
#define REF_OPEN 2 /* has timers, possibly active */
#define REF_OPENING 1 /* in use (has a pcb) but no timers */
#define REF_FREE 0 /* free to reallocate */
#define TM_NTIMERS 6
struct tp_ref {
struct tp_pcb *tpr_pcb; /* back ptr to PCB */
};
/* PER system stuff (one static structure instead of a bunch of names) */
struct tp_refinfo {
struct tp_ref *tpr_base;
int tpr_size;
int tpr_maxopen;
int tpr_numopen;
};
struct nl_protosw {
int nlp_afamily; /* address family */
int (*nlp_putnetaddr)(); /* puts addresses in nl pcb */
int (*nlp_getnetaddr)(); /* gets addresses from nl pcb */
int (*nlp_cmpnetaddr)(); /* compares address in pcb with sockaddr */
int (*nlp_putsufx)(); /* puts transport suffixes in nl pcb */
int (*nlp_getsufx)(); /* gets transport suffixes from nl pcb */
int (*nlp_recycle_suffix)();/* clears suffix from nl pcb */
int (*nlp_mtu)(); /* figures out mtu based on nl used */
int (*nlp_pcbbind)(); /* bind to pcb for net level */
int (*nlp_pcbconn)(); /* connect for net level */
int (*nlp_pcbdisc)(); /* disconnect net level */
int (*nlp_pcbdetach)(); /* detach net level pcb */
int (*nlp_pcballoc)(); /* allocate a net level pcb */
int (*nlp_output)(); /* prepare a packet to give to nl */
int (*nlp_dgoutput)(); /* prepare a packet to give to nl */
int (*nlp_ctloutput)(); /* hook for network set/get options */
caddr_t nlp_pcblist; /* list of xx_pcb's for connections */
};
struct tp_pcb {
struct tp_pcb *tp_next;
struct tp_pcb *tp_prev;
struct tp_pcb *tp_nextlisten; /* chain all listeners */
struct socket *tp_sock; /* back ptr */
u_short tp_state; /* state of fsm */
short tp_retrans; /* # times can still retrans */
caddr_t tp_npcb; /* to lower layer pcb */
struct nl_protosw *tp_nlproto; /* lower-layer dependent routines */
struct rtentry **tp_routep; /* obtain mtu; inside npcb */
RefNum tp_lref; /* local reference */
RefNum tp_fref; /* foreign reference */
u_int tp_seqmask; /* mask for seq space */
u_int tp_seqbit; /* bit for seq number wraparound */
u_int tp_seqhalf; /* half the seq space */
struct mbuf *tp_ucddata; /* user connect/disconnect data */
/* credit & sequencing info for SENDING */
u_short tp_fcredit; /* current remote credit in # packets */
u_short tp_maxfcredit; /* max remote credit in # packets */
u_short tp_dupacks; /* intuit packet loss before rxt timo */
u_long tp_cong_win; /* congestion window in bytes.
* see profuse comments in TCP code
*/
u_long tp_ssthresh; /* cong_win threshold for slow start
* exponential to linear switch
*/
SeqNum tp_snduna; /* seq # of lowest unacked DT */
SeqNum tp_sndnew; /* seq # of lowest unsent DT */
SeqNum tp_sndnum; /* next seq # to be assigned */
SeqNum tp_sndnxt; /* what to do next; poss. rxt */
struct mbuf *tp_sndnxt_m; /* packet corres. to sndnxt*/
int tp_Nwindow; /* for perf. measurement */
/* credit & sequencing info for RECEIVING */
SeqNum tp_rcvnxt; /* next DT seq # expect to recv */
SeqNum tp_sent_lcdt; /* cdt according to last ack sent */
SeqNum tp_sent_uwe; /* uwe according to last ack sent */
SeqNum tp_sent_rcvnxt; /* rcvnxt according to last ack sent
* needed for perf measurements only
*/
u_short tp_lcredit; /* current local credit in # packets */
u_short tp_maxlcredit; /* needed for reassembly queue */
struct mbuf **tp_rsyq; /* unacked stuff recvd out of order */
int tp_rsycnt; /* number of packets "" "" "" "" */
u_long tp_rhiwat; /* remember original RCVBUF size */
/* receiver congestion state stuff ... */
u_int tp_win_recv;
/* receive window as a scaled int (8 bit fraction part) */
struct cong_sample {
ushort cs_size; /* current window size */
ushort cs_received; /* PDUs received in this sample */
ushort cs_ce_set; /* PDUs received in this sample with CE bit set */
} tp_cong_sample;
/* parameters per-connection controllable by user */
struct tp_conn_param _tp_param;
#define tp_Nretrans _tp_param.p_Nretrans
#define tp_dr_ticks _tp_param.p_dr_ticks
#define tp_cc_ticks _tp_param.p_cc_ticks
#define tp_dt_ticks _tp_param.p_dt_ticks
#define tp_xpd_ticks _tp_param.p_x_ticks
#define tp_cr_ticks _tp_param.p_cr_ticks
#define tp_keepalive_ticks _tp_param.p_keepalive_ticks
#define tp_sendack_ticks _tp_param.p_sendack_ticks
#define tp_refer_ticks _tp_param.p_ref_ticks
#define tp_inact_ticks _tp_param.p_inact_ticks
#define tp_xtd_format _tp_param.p_xtd_format
#define tp_xpd_service _tp_param.p_xpd_service
#define tp_ack_strat _tp_param.p_ack_strat
#define tp_rx_strat _tp_param.p_rx_strat
#define tp_use_checksum _tp_param.p_use_checksum
#define tp_use_efc _tp_param.p_use_efc
#define tp_use_nxpd _tp_param.p_use_nxpd
#define tp_use_rcc _tp_param.p_use_rcc
#define tp_tpdusize _tp_param.p_tpdusize
#define tp_class _tp_param.p_class
#define tp_winsize _tp_param.p_winsize
#define tp_no_disc_indications _tp_param.p_no_disc_indications
#define tp_dont_change_params _tp_param.p_dont_change_params
#define tp_netservice _tp_param.p_netservice
#define tp_version _tp_param.p_version
#define tp_ptpdusize _tp_param.p_ptpdusize
int tp_l_tpdusize;
/* whereas tp_tpdusize is log2(the negotiated max size)
* l_tpdusize is the size we'll use when sending, in # chars
*/
int tp_rtv; /* max round-trip time variance */
int tp_rtt; /* smoothed round-trip time */
SeqNum tp_rttseq; /* packet being timed */
int tp_rttemit; /* when emitted, in ticks */
int tp_idle; /* last activity, in ticks */
short tp_rxtcur; /* current retransmit value */
short tp_rxtshift; /* log(2) of rexmt exp. backoff */
u_char tp_cebit_off; /* real DEC bit algorithms not in use */
u_char tp_oktonagle; /* Last unsent pckt may be append to */
u_char tp_flags; /* values: */
#define TPF_NLQOS_PDN TPFLAG_NLQOS_PDN
#define TPF_PEER_ON_SAMENET TPFLAG_PEER_ON_SAMENET
#define TPF_GENERAL_ADDR TPFLAG_GENERAL_ADDR
#define TPF_DELACK 0x8
#define TPF_ACKNOW 0x10
#define PEER_IS_LOCAL(t) (((t)->tp_flags & TPF_PEER_ON_SAME_NET) != 0)
#define USES_PDN(t) (((t)->tp_flags & TPF_NLQOS_PDN) != 0)
unsigned
tp_sendfcc:1, /* shall next ack include FCC parameter? */
tp_trace:1, /* is this pcb being traced? (not used yet) */
tp_perf_on:1, /* 0/1 -> performance measuring on */
tp_reneged:1, /* have we reneged on cdt since last ack? */
tp_decbit:3, /* dec bit was set, we're in reneg mode */
tp_notdetached:1; /* Call tp_detach before freeing XXXXXXX */
#ifdef TP_PERF_MEAS
/* performance stats - see tp_stat.h */
struct tp_pmeas *tp_p_meas;
struct mbuf *tp_p_mbuf;
#endif /* TP_PERF_MEAS */
/* addressing */
u_short tp_domain; /* domain (INET, ISO) */
/* for compatibility with the *old* way and with INET, be sure that
* that lsuffix and fsuffix are aligned to a short addr.
* having them follow the u_short *suffixlen should suffice (choke)
*/
u_short tp_fsuffixlen; /* foreign suffix */
char tp_fsuffix[MAX_TSAP_SEL_LEN];
u_short tp_lsuffixlen; /* local suffix */
char tp_lsuffix[MAX_TSAP_SEL_LEN];
#define SHORT_LSUFXP(tpcb) ((short *)((tpcb)->tp_lsuffix))
#define SHORT_FSUFXP(tpcb) ((short *)((tpcb)->tp_fsuffix))
/* Timer stuff */
u_char tp_vers; /* protocol version */
u_char tp_peer_acktime; /* used for DT retrans time */
u_char tp_refstate; /* values REF_FROZEN, etc. above */
struct tp_pcb *tp_fasttimeo; /* limit pcbs to examine */
u_int tp_timer[TM_NTIMERS]; /* C timers */
struct sockbuf tp_Xsnd; /* for expedited data */
/* struct sockbuf tp_Xrcv; /* for expedited data */
#define tp_Xrcv tp_sock->so_rcv
SeqNum tp_Xsndnxt; /* next XPD seq # to send */
SeqNum tp_Xuna; /* seq # of unacked XPD */
SeqNum tp_Xrcvnxt; /* next XPD seq # expect to recv */
/* AK subsequencing */
u_short tp_s_subseq; /* next subseq to send */
u_short tp_r_subseq; /* highest recv subseq */
};
u_int tp_start_win;
#define ROUND(scaled_int) (((scaled_int) >> 8) + (((scaled_int) & 0x80) ? 1:0))
/* to round off a scaled int with an 8 bit fraction part */
#define CONG_INIT_SAMPLE(pcb) \
pcb->tp_cong_sample.cs_received = \
pcb->tp_cong_sample.cs_ce_set = 0; \
pcb->tp_cong_sample.cs_size = max(pcb->tp_lcredit, 1) << 1;
#define CONG_UPDATE_SAMPLE(pcb, ce_bit) \
pcb->tp_cong_sample.cs_received++; \
if (ce_bit) { \
pcb->tp_cong_sample.cs_ce_set++; \
} \
if (pcb->tp_cong_sample.cs_size <= pcb->tp_cong_sample.cs_received) { \
if ((pcb->tp_cong_sample.cs_ce_set << 1) >= \
pcb->tp_cong_sample.cs_size ) { \
pcb->tp_win_recv -= pcb->tp_win_recv >> 3; /* multiply by .875 */ \
pcb->tp_win_recv = max(1 << 8, pcb->tp_win_recv); \
} \
else { \
pcb->tp_win_recv += (1 << 8); /* add one to the scaled int */ \
} \
pcb->tp_lcredit = ROUND(pcb->tp_win_recv); \
CONG_INIT_SAMPLE(pcb); \
}
#ifdef KERNEL
extern struct tp_refinfo tp_refinfo;
extern struct tp_ref *tp_ref;
extern struct tp_param tp_param;
extern struct nl_protosw nl_protosw[];
extern struct tp_pcb *tp_listeners;
extern struct tp_pcb *tp_ftimeolist;
#endif
#define sototpcb(so) ((struct tp_pcb *)(so->so_pcb))
#define sototpref(so) ((sototpcb(so)->tp_ref))
#define tpcbtoso(tp) ((struct socket *)((tp)->tp_sock))
#define tpcbtoref(tp) ((struct tp_ref *)((tp)->tp_ref))
#endif /* __TP_PCB__ */
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.