FreeBSD/Linux Kernel Cross Reference
sys/netipx/spx.h
1 /*
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.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
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.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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
32 * SUCH DAMAGE.
33 *
34 * @(#)spx.h
35 *
36 * $FreeBSD: src/sys/netipx/spx.h,v 1.7.4.2 1999/09/05 08:19:07 peter Exp $
37 */
38
39 #ifndef _NETIPX_SPX_H_
40 #define _NETIPX_SPX_H_
41
42 /*
43 * Definitions for IPX style Sequenced Packet Protocol
44 */
45
46 struct spxhdr {
47 u_char spx_cc; /* connection control */
48 u_char spx_dt; /* datastream type */
49 #define SPX_SP 0x80 /* system packet */
50 #define SPX_SA 0x40 /* send acknowledgement */
51 #define SPX_OB 0x20 /* attention (out of band data) */
52 #define SPX_EM 0x10 /* end of message */
53 u_short spx_sid; /* source connection identifier */
54 u_short spx_did; /* destination connection identifier */
55 u_short spx_seq; /* sequence number */
56 u_short spx_ack; /* acknowledge number */
57 u_short spx_alo; /* allocation number */
58 };
59
60 /*
61 * Definitions for NS(tm) Internet Datagram Protocol
62 * containing a Sequenced Packet Protocol packet.
63 */
64 struct spx {
65 struct ipx si_i;
66 struct spxhdr si_s;
67 };
68 struct spx_q {
69 struct spx_q *si_next;
70 struct spx_q *si_prev;
71 };
72 #define SI(x) ((struct spx *)x)
73 #define si_sum si_i.ipx_sum
74 #define si_len si_i.ipx_len
75 #define si_tc si_i.ipx_tc
76 #define si_pt si_i.ipx_pt
77 #define si_dna si_i.ipx_dna
78 #define si_sna si_i.ipx_sna
79 #define si_sport si_i.ipx_sna.x_port
80 #define si_cc si_s.spx_cc
81 #define si_dt si_s.spx_dt
82 #define si_sid si_s.spx_sid
83 #define si_did si_s.spx_did
84 #define si_seq si_s.spx_seq
85 #define si_ack si_s.spx_ack
86 #define si_alo si_s.spx_alo
87
88 /*
89 * SPX control block, one per connection
90 */
91 struct spxpcb {
92 struct spx_q s_q; /* queue for out-of-order receipt */
93 struct ipxpcb *s_ipxpcb; /* backpointer to internet pcb */
94 u_char s_state;
95 u_char s_flags;
96 #define SF_ACKNOW 0x01 /* Ack peer immediately */
97 #define SF_DELACK 0x02 /* Ack, but try to delay it */
98 #define SF_HI 0x04 /* Show headers on input */
99 #define SF_HO 0x08 /* Show headers on output */
100 #define SF_PI 0x10 /* Packet (datagram) interface */
101 #define SF_WIN 0x20 /* Window info changed */
102 #define SF_RXT 0x40 /* Rxt info changed */
103 #define SF_RVD 0x80 /* Calling from read usrreq routine */
104 u_short s_mtu; /* Max packet size for this stream */
105 /* use sequence fields in headers to store sequence numbers for this
106 connection */
107 struct ipx *s_ipx;
108 struct spxhdr s_shdr; /* prototype header to transmit */
109 #define s_cc s_shdr.spx_cc /* connection control (for EM bit) */
110 #define s_dt s_shdr.spx_dt /* datastream type */
111 #define s_sid s_shdr.spx_sid /* source connection identifier */
112 #define s_did s_shdr.spx_did /* destination connection identifier */
113 #define s_seq s_shdr.spx_seq /* sequence number */
114 #define s_ack s_shdr.spx_ack /* acknowledge number */
115 #define s_alo s_shdr.spx_alo /* allocation number */
116 #define s_dport s_ipx->ipx_dna.x_port /* where we are sending */
117 struct spxhdr s_rhdr; /* last received header (in effect!)*/
118 u_short s_rack; /* their acknowledge number */
119 u_short s_ralo; /* their allocation number */
120 u_short s_smax; /* highest packet # we have sent */
121 u_short s_snxt; /* which packet to send next */
122
123 /* congestion control */
124 #define CUNIT 1024 /* scaling for ... */
125 int s_cwnd; /* Congestion-controlled window */
126 /* in packets * CUNIT */
127 short s_swnd; /* == tcp snd_wnd, in packets */
128 short s_smxw; /* == tcp max_sndwnd */
129 /* difference of two spx_seq's can be
130 no bigger than a short */
131 u_short s_swl1; /* == tcp snd_wl1 */
132 u_short s_swl2; /* == tcp snd_wl2 */
133 int s_cwmx; /* max allowable cwnd */
134 int s_ssthresh; /* s_cwnd size threshold for
135 * slow start exponential-to-
136 * linear switch */
137 /* transmit timing stuff
138 * srtt and rttvar are stored as fixed point, for convenience in smoothing.
139 * srtt has 3 bits to the right of the binary point, rttvar has 2.
140 */
141 short s_idle; /* time idle */
142 #define SPXT_NTIMERS 4
143 short s_timer[SPXT_NTIMERS]; /* timers */
144 short s_rxtshift; /* log(2) of rexmt exp. backoff */
145 short s_rxtcur; /* current retransmit value */
146 u_short s_rtseq; /* packet being timed */
147 short s_rtt; /* timer for round trips */
148 short s_srtt; /* averaged timer */
149 short s_rttvar; /* variance in round trip time */
150 char s_force; /* which timer expired */
151 char s_dupacks; /* counter to intuit xmt loss */
152
153 /* out of band data */
154 char s_oobflags;
155 #define SF_SOOB 0x08 /* sending out of band data */
156 #define SF_IOOB 0x10 /* receiving out of band data */
157 char s_iobc; /* input characters */
158 /* debug stuff */
159 u_short s_want; /* Last candidate for sending */
160 char s_outx; /* exit taken from spx_output */
161 char s_inx; /* exit taken from spx_input */
162 u_short s_flags2; /* more flags for testing */
163 #define SF_NEWCALL 0x100 /* for new_recvmsg */
164 #define SO_NEWCALL 10 /* for new_recvmsg */
165 };
166
167 #define ipxtospxpcb(np) ((struct spxpcb *)(np)->ipxp_pcb)
168 #define sotospxpcb(so) (ipxtospxpcb(sotoipxpcb(so)))
169
170 #ifdef KERNEL
171
172 extern struct pr_usrreqs spx_usrreqs;
173 extern struct pr_usrreqs spx_usrreq_sps;
174
175 void spx_ctlinput __P((int cmd, struct sockaddr *arg_as_sa, void *dummy));
176 int spx_ctloutput __P((int req, struct socket *so, int level, int name,
177 struct mbuf **value));
178 void spx_fasttimo __P((void));
179 void spx_init __P((void));
180 void spx_input __P((struct mbuf *m, struct ipxpcb *ipxp));
181 void spx_slowtimo __P((void));
182
183 #endif /* KERNEL */
184
185 #endif /* !_NETIPX_SPX_H_ */
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