2 * Copyright (c) 1995, Mike Mitchell
3 * Copyright (c) 1984, 1985, 1986, 1987, 1993
4 * The Regents of the University of California. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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10 * notice, this list of conditions and the following disclaimer.
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14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
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29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * $FreeBSD: src/sys/netipx/spx.h,v 1.16 1999/12/29 04:46:09 peter Exp $
37 * $DragonFly: src/sys/netproto/ipx/spx.h,v 1.4 2004/06/04 20:27:31 dillon Exp $
40 #ifndef _NETIPX_SPX_H_
41 #define _NETIPX_SPX_H_
44 * Definitions for IPX style Sequenced Packet Protocol
48 u_char spx_cc
; /* connection control */
49 u_char spx_dt
; /* datastream type */
50 #define SPX_SP 0x80 /* system packet */
51 #define SPX_SA 0x40 /* send acknowledgement */
52 #define SPX_OB 0x20 /* attention (out of band data) */
53 #define SPX_EM 0x10 /* end of message */
54 u_short spx_sid
; /* source connection identifier */
55 u_short spx_did
; /* destination connection identifier */
56 u_short spx_seq
; /* sequence number */
57 u_short spx_ack
; /* acknowledge number */
58 u_short spx_alo
; /* allocation number */
62 * Definitions for NS(tm) Internet Datagram Protocol
63 * containing a Sequenced Packet Protocol packet.
70 struct spx_q
*si_next
;
71 struct spx_q
*si_prev
;
74 #define SI(x) mtod((x)->si_mbuf, struct spx *)
75 #define si_sum si_i.ipx_sum
76 #define si_len si_i.ipx_len
77 #define si_tc si_i.ipx_tc
78 #define si_pt si_i.ipx_pt
79 #define si_dna si_i.ipx_dna
80 #define si_sna si_i.ipx_sna
81 #define si_sport si_i.ipx_sna.x_port
82 #define si_cc si_s.spx_cc
83 #define si_dt si_s.spx_dt
84 #define si_sid si_s.spx_sid
85 #define si_did si_s.spx_did
86 #define si_seq si_s.spx_seq
87 #define si_ack si_s.spx_ack
88 #define si_alo si_s.spx_alo
91 * SPX control block, one per connection
94 struct spx_q s_q
; /* queue for out-of-order receipt */
95 struct ipxpcb
*s_ipxpcb
; /* backpointer to internet pcb */
98 #define SF_ACKNOW 0x01 /* Ack peer immediately */
99 #define SF_DELACK 0x02 /* Ack, but try to delay it */
100 #define SF_HI 0x04 /* Show headers on input */
101 #define SF_HO 0x08 /* Show headers on output */
102 #define SF_PI 0x10 /* Packet (datagram) interface */
103 #define SF_WIN 0x20 /* Window info changed */
104 #define SF_RXT 0x40 /* Rxt info changed */
105 #define SF_RVD 0x80 /* Calling from read usrreq routine */
106 u_short s_mtu
; /* Max packet size for this stream */
107 /* use sequence fields in headers to store sequence numbers for this
109 struct mbuf
*s_ipx_m
;
111 struct spxhdr s_shdr
; /* prototype header to transmit */
112 #define s_cc s_shdr.spx_cc /* connection control (for EM bit) */
113 #define s_dt s_shdr.spx_dt /* datastream type */
114 #define s_sid s_shdr.spx_sid /* source connection identifier */
115 #define s_did s_shdr.spx_did /* destination connection identifier */
116 #define s_seq s_shdr.spx_seq /* sequence number */
117 #define s_ack s_shdr.spx_ack /* acknowledge number */
118 #define s_alo s_shdr.spx_alo /* allocation number */
119 #define s_dport s_ipx->ipx_dna.x_port /* where we are sending */
120 struct spxhdr s_rhdr
; /* last received header (in effect!)*/
121 u_short s_rack
; /* their acknowledge number */
122 u_short s_ralo
; /* their allocation number */
123 u_short s_smax
; /* highest packet # we have sent */
124 u_short s_snxt
; /* which packet to send next */
126 /* congestion control */
127 #define CUNIT 1024 /* scaling for ... */
128 int s_cwnd
; /* Congestion-controlled window */
129 /* in packets * CUNIT */
130 short s_swnd
; /* == tcp snd_wnd, in packets */
131 short s_smxw
; /* == tcp max_sndwnd */
132 /* difference of two spx_seq's can be
133 no bigger than a short */
134 u_short s_swl1
; /* == tcp snd_wl1 */
135 u_short s_swl2
; /* == tcp snd_wl2 */
136 int s_cwmx
; /* max allowable cwnd */
137 int s_ssthresh
; /* s_cwnd size threshold for
138 * slow start exponential-to-
140 /* transmit timing stuff
141 * srtt and rttvar are stored as fixed point, for convenience in smoothing.
142 * srtt has 3 bits to the right of the binary point, rttvar has 2.
144 short s_idle
; /* time idle */
145 #define SPXT_NTIMERS 4
146 short s_timer
[SPXT_NTIMERS
]; /* timers */
147 short s_rxtshift
; /* log(2) of rexmt exp. backoff */
148 short s_rxtcur
; /* current retransmit value */
149 u_short s_rtseq
; /* packet being timed */
150 short s_rtt
; /* timer for round trips */
151 short s_srtt
; /* averaged timer */
152 short s_rttvar
; /* variance in round trip time */
153 char s_force
; /* which timer expired */
154 char s_dupacks
; /* counter to intuit xmt loss */
156 /* out of band data */
158 #define SF_SOOB 0x08 /* sending out of band data */
159 #define SF_IOOB 0x10 /* receiving out of band data */
160 char s_iobc
; /* input characters */
162 u_short s_want
; /* Last candidate for sending */
163 char s_outx
; /* exit taken from spx_output */
164 char s_inx
; /* exit taken from spx_input */
165 u_short s_flags2
; /* more flags for testing */
166 #define SF_NEWCALL 0x100 /* for new_recvmsg */
167 #define SO_NEWCALL 10 /* for new_recvmsg */
170 #define ipxtospxpcb(np) ((struct spxpcb *)(np)->ipxp_pcb)
171 #define sotospxpcb(so) (ipxtospxpcb(sotoipxpcb(so)))
175 extern struct pr_usrreqs spx_usrreqs
;
176 extern struct pr_usrreqs spx_usrreq_sps
;
178 void spx_ctlinput (int cmd
, struct sockaddr
*arg_as_sa
, void *dummy
);
179 int spx_ctloutput (struct socket
*so
, struct sockopt
*sopt
);
180 void spx_fasttimo (void);
181 void spx_init (void);
182 void spx_input (struct mbuf
*m
, struct ipxpcb
*ipxp
);
183 void spx_slowtimo (void);
187 #endif /* !_NETIPX_SPX_H_ */