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- /*-
- * Copyright (c) 1991 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 7.9 (Berkeley) 5/6/91
- */
-
- /***********************************************************
- 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 "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 N_CTIMERS 4
- #define N_ETIMERS 2
-
- struct tp_ref {
- u_char tpr_state; /* values REF_FROZEN, etc. above */
- struct Ccallout tpr_callout[N_CTIMERS]; /* C timers */
- struct Ecallout tpr_calltodo; /* list of active E timers */
- struct tp_pcb *tpr_pcb; /* back ptr to PCB */
- };
-
- struct tp_param {
- /* PER system stuff (one static structure instead of a bunch of names) */
- unsigned tpp_configed:1; /* Has TP been initialized? */
- };
-
-
- /*
- * retransmission control and performance measurement
- */
- struct tp_rtc {
- struct tp_rtc *tprt_next; /* ptr to next rtc structure in the list */
- SeqNum tprt_seq; /* seq # of this TPDU */
- int tprt_eot; /* Will this TPDU have the eot bit set? */
- int tprt_octets;/* # octets in this TPDU */
- struct mbuf *tprt_data; /* ptr to the octets of data */
- };
-
- 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 */
- u_short tp_state; /* state of fsm */
- short tp_retrans; /* # times can still retrans */
- struct tp_ref *tp_refp; /* rest of pcb */
- caddr_t tp_npcb; /* to lower layer pcb */
- struct nl_protosw *tp_nlproto; /* lower-layer dependent routines */
- struct socket *tp_sock; /* back ptr */
-
-
- 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 */
-
- /* credit & sequencing info for SENDING */
- u_short tp_fcredit; /* current remote credit in # packets */
-
- u_short tp_cong_win; /* congestion window : set to 1 on
- * source quench
- * Minimizes the amount of retrans-
- * missions (independently of the
- * retrans strategy). Increased
- * by one for each good ack received.
- * Minimizes the amount sent in a
- * regular tp_send() also.
- */
- u_int tp_ackrcvd; /* ACKs received since the send window was updated */
- SeqNum tp_last_retrans;
- SeqNum tp_retrans_hiwat;
- SeqNum tp_snduna; /* seq # of lowest unacked DT */
- struct tp_rtc *tp_snduna_rtc; /* lowest unacked stuff sent so far */
- SeqNum tp_sndhiwat; /* highest seq # sent so far */
-
- struct tp_rtc *tp_sndhiwat_rtc; /* last stuff sent so far */
- int tp_Nwindow; /* for perf. measurement */
- struct mbuf *tp_ucddata; /* user connect/disconnect data */
-
- /* credit & sequencing info for RECEIVING */
- 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 */
- SeqNum tp_rcvnxt; /* next DT seq # expect to recv */
- struct tp_rtc *tp_rcvnxt_rtc; /* unacked stuff recvd out of order */
-
- /* 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
-
- 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
- */
-
- struct timeval tp_rtv; /* max round-trip time variance */
- struct timeval tp_rtt; /* smoothed round-trip time */
- struct timeval tp_rttemit[ TP_RTT_NUM + 1 ];
- /* times that the last TP_RTT_NUM DT_TPDUs were emitted */
- 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_cebit_off:1, /* the real DEC bit algorithms not in use */
- tp_flags:8, /* values: */
- #define TPF_CONN_DATA_OUT TPFLAG_CONN_DATA_OUT
- #define TPF_CONN_DATA_IN TPFLAG_CONN_DATA_IN
- #define TPF_DISC_DATA_IN TPFLAG_DISC_DATA_IN
- #define TPF_DISC_DATA_OUT TPFLAG_DISC_DATA_OUT
- #define TPF_XPD_PRESENT TPFLAG_XPD_PRESENT
- #define TPF_NLQOS_PDN TPFLAG_NLQOS_PDN
- #define TPF_PEER_ON_SAMENET TPFLAG_PEER_ON_SAMENET
-
- #define PEER_IS_LOCAL(t) \
- (((t)->tp_flags & TPF_PEER_ON_SAME_NET)==TPF_PEER_ON_SAME_NET)
- #define USES_PDN(t) \
- (((t)->tp_flags & TPF_NLQOS_PDN)==TPF_NLQOS_PDN)
-
- tp_unused:16;
-
-
- #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))
-
- u_char tp_vers; /* protocol version */
- u_char tp_peer_acktime; /* used to compute DT retrans time */
-
- 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); \
- }
-
- #define CONG_ACK(pcb, seq) \
- { int newacks = SEQ_SUB(pcb, seq, pcb->tp_snduna); \
- if (newacks > 0) { \
- pcb->tp_ackrcvd += newacks; \
- if (pcb->tp_ackrcvd >= MIN(pcb->tp_fcredit, pcb->tp_cong_win)) { \
- ++pcb->tp_cong_win; \
- pcb->tp_ackrcvd = 0; \
- } \
- } \
- }
-
- #ifdef KERNEL
- extern struct timeval time;
- 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_intercepts;
- #endif
-
- #define sototpcb(so) ((struct tp_pcb *)(so->so_tpcb))
- #define sototpref(so) ((struct tp_ref *)((so)->so_tpcb->tp_ref))
- #define tpcbtoso(tp) ((struct socket *)((tp)->tp_sock))
- #define tpcbtoref(tp) ((struct tp_ref *)((tp)->tp_ref))
-
- #endif __TP_PCB__
-