2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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29 * @(#)if_slvar.h 8.3 (Berkeley) 2/1/94
34 #ifndef _NET_IF_SLVAR_H_
35 #define _NET_IF_SLVAR_H_
37 #include <sys/callout.h>
40 * Definitions for SLIP interface data structures
42 * (This exists so programs like slstats can get at the definition
46 struct ifnet *sc_ifp; /* network-visible interface */
47 struct ifqueue sc_fastq; /* interactive output queue */
48 struct tty *sc_ttyp; /* pointer to tty structure */
49 struct mbuf *sc_mbuf; /* pointer to mbuf containing buffer */
50 u_char *sc_mp; /* pointer to next available buf char */
51 u_char *sc_ep; /* pointer to last available buf char */
52 u_char *sc_buf; /* input buffer */
53 u_int sc_flags; /* see below */
54 u_int sc_escape; /* =1 if last char input was FRAME_ESCAPE */
55 time_t sc_lasttime; /* last time a char arrived */
56 long sc_abortcount; /* number of abort escape chars */
57 time_t sc_starttime; /* time of first abort in window */
58 u_int sc_keepalive; /* time to decide link hang */
59 u_int sc_outfill; /* time to send FRAME_END when output idle */
61 * Handles for scheduling outfill and
64 struct callout_handle sc_ofhandle;
65 struct callout_handle sc_kahandle;
66 struct slcompress sc_comp; /* tcp compression data */
67 LIST_ENTRY(sl_softc) sl_next;
68 u_char *bpfbuf; /* hang buffer for bpf here */
70 #define SL2IFP(sc) ((sc)->sc_ifp)
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 */
78 #define SC_COMPRESS IFF_LINK0 /* compress TCP traffic */
79 #define SC_NOICMP IFF_LINK1 /* suppress ICMP traffic */
80 #define SC_AUTOCOMP IFF_LINK2 /* auto-enable TCP compression */