2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)if_slvar.h 8.3 (Berkeley) 2/1/94
38 #ifndef _NET_IF_SLVAR_H_
39 #define _NET_IF_SLVAR_H_
41 #include <sys/callout.h>
44 * Definitions for SLIP interface data structures
46 * (This exists so programs like slstats can get at the definition
50 struct ifnet sc_if; /* network-visible interface */
51 struct ifqueue sc_fastq; /* interactive output queue */
52 struct tty *sc_ttyp; /* pointer to tty structure */
53 u_char *sc_mp; /* pointer to next available buf char */
54 u_char *sc_ep; /* pointer to last available buf char */
55 u_char *sc_buf; /* input buffer */
56 u_int sc_flags; /* see below */
57 u_int sc_escape; /* =1 if last char input was FRAME_ESCAPE */
58 long sc_lasttime; /* last time a char arrived */
59 long sc_abortcount; /* number of abort escape chars */
60 long sc_starttime; /* time of first abort in window */
61 u_int sc_keepalive; /* time to decide link hang */
62 u_int sc_outfill; /* time to send FRAME_END when output idle */
64 * Handles for scheduling outfill and
67 struct callout_handle sc_ofhandle;
68 struct callout_handle sc_kahandle;
69 struct slcompress sc_comp; /* tcp compression data */
73 #define SC_ERROR 0x0001 /* had an input error */
74 #define SC_OUTWAIT 0x0002 /* waiting for output fill */
75 #define SC_KEEPALIVE 0x0004 /* input keepalive */
76 #define SC_STATIC 0x0008 /* it is static unit */
79 #define SC_COMPRESS IFF_LINK0 /* compress TCP traffic */
80 #define SC_NOICMP IFF_LINK1 /* suppress ICMP traffic */
81 #define SC_AUTOCOMP IFF_LINK2 /* auto-enable TCP compression */