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1 | /* |
2 | * if_ppp.h - Point-to-Point Protocol definitions. | |
3 | * | |
4 | * Copyright (c) 1989 Carnegie Mellon University. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Redistribution and use in source and binary forms are permitted | |
8 | * provided that the above copyright notice and this paragraph are | |
9 | * duplicated in all such forms and that any documentation, | |
10 | * advertising materials, and other materials related to such | |
11 | * distribution and use acknowledge that the software was developed | |
12 | * by Carnegie Mellon University. The name of the | |
13 | * University may not be used to endorse or promote products derived | |
14 | * from this software without specific prior written permission. | |
15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
18 | * | |
19 | * Modified by Paul Mackerras (paulus@cs.anu.edu.au) | |
20 | * PPP_MRU added, PPP_MTU changed to 296 (default only), added sc_outm. | |
21 | * | |
22 | * $Id$ | |
23 | * From: if_ppp.h,v 1.3 1993/08/09 02:37:32 paulus Exp | |
24 | */ | |
25 | ||
26 | /* | |
27 | * Standard PPP header. | |
28 | */ | |
29 | struct ppp_header { | |
30 | u_char ph_address; /* Address Field */ | |
31 | u_char ph_control; /* Control Field */ | |
32 | u_short ph_protocol; /* Protocol Field */ | |
33 | }; | |
34 | ||
35 | #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */ | |
36 | #define PPP_UI 0x03 /* Unnumbered Information */ | |
37 | #define PPP_FLAG 0x7e /* Flag Sequence */ | |
38 | #define PPP_ESCAPE 0x7d /* Asynchronous Control Escape */ | |
39 | #define PPP_TRANS 0x20 /* Asynchronous transparency modifier */ | |
40 | ||
41 | /* | |
42 | * Protocol types. | |
43 | */ | |
44 | #define PPP_IP 0x21 /* Internet Protocol */ | |
45 | #define PPP_XNS 0x25 /* Xerox NS */ | |
46 | #define PPP_VJC_COMP 0x2d /* VJ compressed TCP */ | |
47 | #define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */ | |
48 | #define PPP_LCP 0xc021 /* Link Control Protocol */ | |
49 | ||
50 | /* | |
51 | * Important FCS values. | |
52 | */ | |
53 | #define PPP_INITFCS 0xffff /* Initial FCS value */ | |
54 | #define PPP_GOODFCS 0xf0b8 /* Good final FCS value */ | |
55 | #define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff]) | |
56 | ||
57 | #define PPP_MTU 296 /* Default MTU (size of Info field) */ | |
58 | #define PPP_MRU 1500 /* Default MRU (max receive unit) */ | |
59 | #define PPP_HIWAT 400 /* Don't start a new packet if HIWAT on que */ | |
60 | ||
61 | struct ppp_softc { | |
62 | struct ifnet sc_if; /* network-visible interface */ | |
63 | u_int sc_flags; /* see below */ | |
64 | struct tty *sc_ttyp; /* pointer to tty structure */ | |
65 | struct mbuf *sc_outm; /* mbuf chain being output currently */ | |
66 | struct mbuf *sc_m; /* pointer to input mbuf chain */ | |
67 | struct mbuf *sc_mc; /* pointer to current input mbuf */ | |
68 | char *sc_mp; /* pointer to next char in input mbuf */ | |
69 | short sc_ilen; /* length of input-packet-so-far */ | |
70 | u_short sc_fcs; /* FCS so far */ | |
71 | u_long sc_asyncmap; /* async control character map */ | |
72 | struct ifqueue sc_inq; /* TTY side input queue */ | |
73 | #ifdef VJC | |
74 | struct slcompress sc_comp; /* vjc control buffer */ | |
75 | #endif | |
76 | u_int sc_bytessent; | |
77 | u_int sc_bytesrcvd; | |
78 | }; | |
79 | ||
80 | /* flags */ | |
81 | #define SC_ESCAPED 0x00010000 /* saw a PPP_ESCAPE */ | |
82 | #define SC_FLUSH 0x00020000 /* flush input until next PPP_FLAG */ | |
83 | #define SC_COMP_PROT 0x00000001 /* protocol compression */ | |
84 | #define SC_COMP_AC 0x00000002 /* header compression */ | |
85 | #define SC_COMP_TCP 0x00000004 /* TCP traffic (VJ) compression */ | |
86 | ||
87 | #define t_sc T_LINEP | |
88 | ||
89 | /* this stuff doesn't belong here... */ | |
90 | #define PPPIOCGFLAGS _IOR('t', 90, int) /* get configuration flags */ | |
91 | #define PPPIOCSFLAGS _IOW('t', 89, int) /* set configuration flags */ | |
92 | #define PPPIOCGASYNCMAP _IOR('t', 88, int) /* get async map */ | |
93 | #define PPPIOCSASYNCMAP _IOW('t', 87, int) /* set async map */ | |
94 | #define PPPIOCGUNIT _IOR('t', 86, int) /* get ppp unit number */ | |
95 | ||
96 | /* old copies of PPP may have defined this */ | |
97 | #if !defined(ifr_mtu) | |
98 | #define ifr_mtu ifr_metric | |
99 | #endif | |
100 |