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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} __packed;
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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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} __packed;
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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(int cmd, struct sockaddr *arg_as_sa, void *dummy);
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int spx_ctloutput(struct socket *so, struct sockopt *sopt);
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void spx_fasttimo(void);
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void spx_init(void);
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void spx_input(struct mbuf *m, struct ipxpcb *ipxp);
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void spx_slowtimo(void);
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#endif /* _KERNEL */
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#endif /* !_NETIPX_SPX_H_ */
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