xref: /freebsd/sys/net/ppp_defs.h (revision fcb560670601b2a4d87bb31d7531c8dcc37ee71b)
1 /*
2  * ppp_defs.h - PPP definitions.
3  */
4 /*-
5  * Copyright (c) 1994 The Australian National University.
6  * All rights reserved.
7  *
8  * Permission to use, copy, modify, and distribute this software and its
9  * documentation is hereby granted, provided that the above copyright
10  * notice appears in all copies.  This software is provided without any
11  * warranty, express or implied. The Australian National University
12  * makes no representations about the suitability of this software for
13  * any purpose.
14  *
15  * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
16  * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
17  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
18  * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
19  * OF SUCH DAMAGE.
20  *
21  * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
22  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
23  * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
24  * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
25  * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
26  * OR MODIFICATIONS.
27  *
28  * $FreeBSD$
29  */
30 
31 #ifndef _PPP_DEFS_H_
32 #define _PPP_DEFS_H_
33 
34 #include <sys/_types.h>
35 
36 /*
37  * The basic PPP frame.
38  */
39 #define PPP_HDRLEN	4	/* octets for standard ppp header */
40 #define PPP_FCSLEN	2	/* octets for FCS */
41 #define PPP_MRU		1500	/* default MRU = max length of info field */
42 
43 #define PPP_ADDRESS(p)	(((u_char *)(p))[0])
44 #define PPP_CONTROL(p)	(((u_char *)(p))[1])
45 #define PPP_PROTOCOL(p)	((((u_char *)(p))[2] << 8) + ((u_char *)(p))[3])
46 
47 /*
48  * Significant octet values.
49  */
50 #define	PPP_ALLSTATIONS	0xff	/* All-Stations broadcast address */
51 #define	PPP_UI		0x03	/* Unnumbered Information */
52 #define	PPP_FLAG	0x7e	/* Flag Sequence */
53 #define	PPP_ESCAPE	0x7d	/* Asynchronous Control Escape */
54 #define	PPP_TRANS	0x20	/* Asynchronous transparency modifier */
55 
56 /*
57  * Protocol field values.
58  */
59 #define PPP_IP		0x21	/* Internet Protocol */
60 #define	PPP_XNS		0x25	/* Xerox NS */
61 #define PPP_AT		0x29	/* AppleTalk Protocol */
62 #define PPP_IPX		0x2b	/* IPX Datagram (RFC1552) */
63 #define	PPP_VJC_COMP	0x2d	/* VJ compressed TCP */
64 #define	PPP_VJC_UNCOMP	0x2f	/* VJ uncompressed TCP */
65 #define PPP_COMP	0xfd	/* compressed packet */
66 #define PPP_IPCP	0x8021	/* IP Control Protocol */
67 #define PPP_ATCP	0x8029	/* AppleTalk Control Protocol */
68 #define PPP_IPXCP	0x802b	/* IPX Control Protocol (RFC1552) */
69 #define PPP_CCP		0x80fd	/* Compression Control Protocol */
70 #define PPP_LCP		0xc021	/* Link Control Protocol */
71 #define PPP_PAP		0xc023	/* Password Authentication Protocol */
72 #define PPP_LQR		0xc025	/* Link Quality Report protocol */
73 #define PPP_CHAP	0xc223	/* Cryptographic Handshake Auth. Protocol */
74 #define PPP_CBCP	0xc029	/* Callback Control Protocol */
75 #define PPP_IPV6	0x57	/* Internet Protocol version 6*/
76 #define PPP_IPV6CP	0x8057	/* IPv6 Control Protocol */
77 
78 /*
79  * Values for FCS calculations.
80  */
81 #define PPP_INITFCS	0xffff	/* Initial FCS value */
82 #define PPP_GOODFCS	0xf0b8	/* Good final FCS value */
83 #define PPP_FCS(fcs, c)	(((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
84 
85 /*
86  * Extended asyncmap - allows any character to be escaped.
87  */
88 typedef __uint32_t	ext_accm[8];
89 
90 /*
91  * What to do with network protocol (NP) packets.
92  */
93 enum NPmode {
94     NPMODE_PASS,		/* pass the packet through */
95     NPMODE_DROP,		/* silently drop the packet */
96     NPMODE_ERROR,		/* return an error */
97     NPMODE_QUEUE		/* save it up for later. */
98 };
99 
100 /*
101  * Statistics.
102  */
103 struct pppstat	{
104     unsigned int ppp_ibytes;	/* bytes received */
105     unsigned int ppp_ipackets;	/* packets received */
106     unsigned int ppp_ierrors;	/* receive errors */
107     unsigned int ppp_obytes;	/* bytes sent */
108     unsigned int ppp_opackets;	/* packets sent */
109     unsigned int ppp_oerrors;	/* transmit errors */
110 };
111 
112 struct vjstat {
113     unsigned int vjs_packets;	/* outbound packets */
114     unsigned int vjs_compressed; /* outbound compressed packets */
115     unsigned int vjs_searches;	/* searches for connection state */
116     unsigned int vjs_misses;	/* times couldn't find conn. state */
117     unsigned int vjs_uncompressedin; /* inbound uncompressed packets */
118     unsigned int vjs_compressedin; /* inbound compressed packets */
119     unsigned int vjs_errorin;	/* inbound unknown type packets */
120     unsigned int vjs_tossed;	/* inbound packets tossed because of error */
121 };
122 
123 struct ppp_stats {
124     struct pppstat p;		/* basic PPP statistics */
125     struct vjstat vj;		/* VJ header compression statistics */
126 };
127 
128 struct compstat {
129     unsigned int unc_bytes;	/* total uncompressed bytes */
130     unsigned int unc_packets;	/* total uncompressed packets */
131     unsigned int comp_bytes;	/* compressed bytes */
132     unsigned int comp_packets;	/* compressed packets */
133     unsigned int inc_bytes;	/* incompressible bytes */
134     unsigned int inc_packets;	/* incompressible packets */
135     unsigned int ratio;		/* recent compression ratio << 8 */
136 };
137 
138 struct ppp_comp_stats {
139     struct compstat c;		/* packet compression statistics */
140     struct compstat d;		/* packet decompression statistics */
141 };
142 
143 /*
144  * The following structure records the time in seconds since
145  * the last NP packet was sent or received.
146  */
147 struct ppp_idle {
148     __time_t xmit_idle;		/* time since last NP packet sent */
149     __time_t recv_idle;		/* time since last NP packet received */
150 };
151 
152 #ifndef __P
153 #ifdef __STDC__
154 #define __P(x)	x
155 #else
156 #define __P(x)	()
157 #endif
158 #endif
159 
160 #endif /* _PPP_DEFS_H_ */
161