1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * ppp_defs.h - PPP definitions.
4 *
5 * Copyright 1994-2000 Paul Mackerras.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 */
11#include <linux/types.h>
12
13#ifndef _PPP_DEFS_H_
14#define _PPP_DEFS_H_
15
16/*
17 * The basic PPP frame.
18 */
19#define PPP_HDRLEN 4 /* octets for standard ppp header */
20#define PPP_FCSLEN 2 /* octets for FCS */
21#define PPP_MRU 1500 /* default MRU = max length of info field */
22
23#define PPP_ADDRESS(p) (((__u8 *)(p))[0])
24#define PPP_CONTROL(p) (((__u8 *)(p))[1])
25#define PPP_PROTOCOL(p) ((((__u8 *)(p))[2] << 8) + ((__u8 *)(p))[3])
26
27/*
28 * Significant octet values.
29 */
30#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
31#define PPP_UI 0x03 /* Unnumbered Information */
32#define PPP_FLAG 0x7e /* Flag Sequence */
33#define PPP_ESCAPE 0x7d /* Asynchronous Control Escape */
34#define PPP_TRANS 0x20 /* Asynchronous transparency modifier */
35
36/*
37 * Protocol field values.
38 */
39#define PPP_IP 0x21 /* Internet Protocol */
40#define PPP_AT 0x29 /* AppleTalk Protocol */
41#define PPP_IPX 0x2b /* IPX protocol */
42#define PPP_VJC_COMP 0x2d /* VJ compressed TCP */
43#define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */
44#define PPP_MP 0x3d /* Multilink protocol */
45#define PPP_IPV6 0x57 /* Internet Protocol Version 6 */
46#define PPP_COMPFRAG 0xfb /* fragment compressed below bundle */
47#define PPP_COMP 0xfd /* compressed packet */
48#define PPP_MPLS_UC 0x0281 /* Multi Protocol Label Switching - Unicast */
49#define PPP_MPLS_MC 0x0283 /* Multi Protocol Label Switching - Multicast */
50#define PPP_IPCP 0x8021 /* IP Control Protocol */
51#define PPP_ATCP 0x8029 /* AppleTalk Control Protocol */
52#define PPP_IPXCP 0x802b /* IPX Control Protocol */
53#define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
54#define PPP_CCPFRAG 0x80fb /* CCP at link level (below MP bundle) */
55#define PPP_CCP 0x80fd /* Compression Control Protocol */
56#define PPP_MPLSCP 0x80fd /* MPLS Control Protocol */
57#define PPP_LCP 0xc021 /* Link Control Protocol */
58#define PPP_PAP 0xc023 /* Password Authentication Protocol */
59#define PPP_LQR 0xc025 /* Link Quality Report protocol */
60#define PPP_CHAP 0xc223 /* Cryptographic Handshake Auth. Protocol */
61#define PPP_CBCP 0xc029 /* Callback Control Protocol */
62
63/*
64 * Values for FCS calculations.
65 */
66
67#define PPP_INITFCS 0xffff /* Initial FCS value */
68#define PPP_GOODFCS 0xf0b8 /* Good final FCS value */
69
70
71/*
72 * Extended asyncmap - allows any character to be escaped.
73 */
74
75typedef __u32 ext_accm[8];
76
77/*
78 * What to do with network protocol (NP) packets.
79 */
80enum NPmode {
81 NPMODE_PASS, /* pass the packet through */
82 NPMODE_DROP, /* silently drop the packet */
83 NPMODE_ERROR, /* return an error */
84 NPMODE_QUEUE /* save it up for later. */
85};
86
87/*
88 * Statistics for LQRP and pppstats
89 */
90struct pppstat {
91 __u32 ppp_discards; /* # frames discarded */
92
93 __u32 ppp_ibytes; /* bytes received */
94 __u32 ppp_ioctects; /* bytes received not in error */
95 __u32 ppp_ipackets; /* packets received */
96 __u32 ppp_ierrors; /* receive errors */
97 __u32 ppp_ilqrs; /* # LQR frames received */
98
99 __u32 ppp_obytes; /* raw bytes sent */
100 __u32 ppp_ooctects; /* frame bytes sent */
101 __u32 ppp_opackets; /* packets sent */
102 __u32 ppp_oerrors; /* transmit errors */
103 __u32 ppp_olqrs; /* # LQR frames sent */
104};
105
106struct vjstat {
107 __u32 vjs_packets; /* outbound packets */
108 __u32 vjs_compressed; /* outbound compressed packets */
109 __u32 vjs_searches; /* searches for connection state */
110 __u32 vjs_misses; /* times couldn't find conn. state */
111 __u32 vjs_uncompressedin; /* inbound uncompressed packets */
112 __u32 vjs_compressedin; /* inbound compressed packets */
113 __u32 vjs_errorin; /* inbound unknown type packets */
114 __u32 vjs_tossed; /* inbound packets tossed because of error */
115};
116
117struct compstat {
118 __u32 unc_bytes; /* total uncompressed bytes */
119 __u32 unc_packets; /* total uncompressed packets */
120 __u32 comp_bytes; /* compressed bytes */
121 __u32 comp_packets; /* compressed packets */
122 __u32 inc_bytes; /* incompressible bytes */
123 __u32 inc_packets; /* incompressible packets */
124
125 /* the compression ratio is defined as in_count / bytes_out */
126 __u32 in_count; /* Bytes received */
127 __u32 bytes_out; /* Bytes transmitted */
128
129 double ratio; /* not computed in kernel. */
130};
131
132struct ppp_stats {
133 struct pppstat p; /* basic PPP statistics */
134 struct vjstat vj; /* VJ header compression statistics */
135};
136
137struct ppp_comp_stats {
138 struct compstat c; /* packet compression statistics */
139 struct compstat d; /* packet decompression statistics */
140};
141
142/*
143 * The following structure records the time in seconds since
144 * the last NP packet was sent or received.
145 */
146struct ppp_idle {
147 __kernel_time_t xmit_idle; /* time since last NP packet sent */
148 __kernel_time_t recv_idle; /* time since last NP packet received */
149};
150
151#endif /* _PPP_DEFS_H_ */
152

source code of include/linux/ppp_defs.h