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664a31e496
is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
185 lines
6.9 KiB
C
185 lines
6.9 KiB
C
/*
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* Copyright (c) 1995, Mike Mitchell
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* Copyright (c) 1984, 1985, 1986, 1987, 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. 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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* @(#)spx.h
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*
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* $FreeBSD$
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*/
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#ifndef _NETIPX_SPX_H_
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#define _NETIPX_SPX_H_
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/*
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* Definitions for IPX style Sequenced Packet Protocol
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*/
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struct spxhdr {
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u_char spx_cc; /* connection control */
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u_char spx_dt; /* datastream type */
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#define SPX_SP 0x80 /* system packet */
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#define SPX_SA 0x40 /* send acknowledgement */
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#define SPX_OB 0x20 /* attention (out of band data) */
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#define SPX_EM 0x10 /* end of message */
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u_short spx_sid; /* source connection identifier */
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u_short spx_did; /* destination connection identifier */
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u_short spx_seq; /* sequence number */
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u_short spx_ack; /* acknowledge number */
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u_short spx_alo; /* allocation number */
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};
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/*
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* Definitions for NS(tm) Internet Datagram Protocol
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* containing a Sequenced Packet Protocol packet.
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*/
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struct spx {
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struct ipx si_i;
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struct spxhdr si_s;
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};
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struct spx_q {
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struct spx_q *si_next;
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struct spx_q *si_prev;
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};
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#define SI(x) ((struct spx *)x)
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#define si_sum si_i.ipx_sum
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#define si_len si_i.ipx_len
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#define si_tc si_i.ipx_tc
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#define si_pt si_i.ipx_pt
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#define si_dna si_i.ipx_dna
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#define si_sna si_i.ipx_sna
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#define si_sport si_i.ipx_sna.x_port
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#define si_cc si_s.spx_cc
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#define si_dt si_s.spx_dt
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#define si_sid si_s.spx_sid
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#define si_did si_s.spx_did
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#define si_seq si_s.spx_seq
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#define si_ack si_s.spx_ack
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#define si_alo si_s.spx_alo
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/*
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* SPX control block, one per connection
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*/
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struct spxpcb {
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struct spx_q s_q; /* queue for out-of-order receipt */
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struct ipxpcb *s_ipxpcb; /* backpointer to internet pcb */
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u_char s_state;
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u_char s_flags;
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#define SF_ACKNOW 0x01 /* Ack peer immediately */
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#define SF_DELACK 0x02 /* Ack, but try to delay it */
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#define SF_HI 0x04 /* Show headers on input */
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#define SF_HO 0x08 /* Show headers on output */
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#define SF_PI 0x10 /* Packet (datagram) interface */
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#define SF_WIN 0x20 /* Window info changed */
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#define SF_RXT 0x40 /* Rxt info changed */
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#define SF_RVD 0x80 /* Calling from read usrreq routine */
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u_short s_mtu; /* Max packet size for this stream */
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/* use sequence fields in headers to store sequence numbers for this
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connection */
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struct ipx *s_ipx;
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struct spxhdr s_shdr; /* prototype header to transmit */
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#define s_cc s_shdr.spx_cc /* connection control (for EM bit) */
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#define s_dt s_shdr.spx_dt /* datastream type */
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#define s_sid s_shdr.spx_sid /* source connection identifier */
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#define s_did s_shdr.spx_did /* destination connection identifier */
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#define s_seq s_shdr.spx_seq /* sequence number */
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#define s_ack s_shdr.spx_ack /* acknowledge number */
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#define s_alo s_shdr.spx_alo /* allocation number */
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#define s_dport s_ipx->ipx_dna.x_port /* where we are sending */
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struct spxhdr s_rhdr; /* last received header (in effect!)*/
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u_short s_rack; /* their acknowledge number */
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u_short s_ralo; /* their allocation number */
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u_short s_smax; /* highest packet # we have sent */
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u_short s_snxt; /* which packet to send next */
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/* congestion control */
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#define CUNIT 1024 /* scaling for ... */
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int s_cwnd; /* Congestion-controlled window */
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/* in packets * CUNIT */
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short s_swnd; /* == tcp snd_wnd, in packets */
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short s_smxw; /* == tcp max_sndwnd */
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/* difference of two spx_seq's can be
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no bigger than a short */
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u_short s_swl1; /* == tcp snd_wl1 */
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u_short s_swl2; /* == tcp snd_wl2 */
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int s_cwmx; /* max allowable cwnd */
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int s_ssthresh; /* s_cwnd size threshold for
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* slow start exponential-to-
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* linear switch */
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/* transmit timing stuff
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* srtt and rttvar are stored as fixed point, for convenience in smoothing.
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* srtt has 3 bits to the right of the binary point, rttvar has 2.
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*/
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short s_idle; /* time idle */
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#define SPXT_NTIMERS 4
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short s_timer[SPXT_NTIMERS]; /* timers */
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short s_rxtshift; /* log(2) of rexmt exp. backoff */
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short s_rxtcur; /* current retransmit value */
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u_short s_rtseq; /* packet being timed */
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short s_rtt; /* timer for round trips */
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short s_srtt; /* averaged timer */
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short s_rttvar; /* variance in round trip time */
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char s_force; /* which timer expired */
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char s_dupacks; /* counter to intuit xmt loss */
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/* out of band data */
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char s_oobflags;
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#define SF_SOOB 0x08 /* sending out of band data */
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#define SF_IOOB 0x10 /* receiving out of band data */
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char s_iobc; /* input characters */
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/* debug stuff */
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u_short s_want; /* Last candidate for sending */
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char s_outx; /* exit taken from spx_output */
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char s_inx; /* exit taken from spx_input */
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u_short s_flags2; /* more flags for testing */
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#define SF_NEWCALL 0x100 /* for new_recvmsg */
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#define SO_NEWCALL 10 /* for new_recvmsg */
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};
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#define ipxtospxpcb(np) ((struct spxpcb *)(np)->ipxp_pcb)
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#define sotospxpcb(so) (ipxtospxpcb(sotoipxpcb(so)))
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#ifdef _KERNEL
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extern struct pr_usrreqs spx_usrreqs;
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extern struct pr_usrreqs spx_usrreq_sps;
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void spx_ctlinput __P((int cmd, struct sockaddr *arg_as_sa, void *dummy));
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int spx_ctloutput __P((struct socket *so, struct sockopt *sopt));
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void spx_fasttimo __P((void));
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void spx_init __P((void));
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void spx_input __P((struct mbuf *m, struct ipxpcb *ipxp));
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void spx_slowtimo __P((void));
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#endif /* _KERNEL */
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#endif /* !_NETIPX_SPX_H_ */
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