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Examples
vj.h
Go to the documentation of this file.
1
/*
2
* Definitions for tcp compression routines.
3
*
4
* $Id: vj.h,v 1.7 2010/02/22 17:52:09 goldsimon Exp $
5
*
6
* Copyright (c) 1989 Regents of the University of California.
7
* All rights reserved.
8
*
9
* Redistribution and use in source and binary forms are permitted
10
* provided that the above copyright notice and this paragraph are
11
* duplicated in all such forms and that any documentation,
12
* advertising materials, and other materials related to such
13
* distribution and use acknowledge that the software was developed
14
* by the University of California, Berkeley. The name of the
15
* University may not be used to endorse or promote products derived
16
* from this software without specific prior written permission.
17
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
18
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
19
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20
*
21
* Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989:
22
* - Initial distribution.
23
*/
24
25
#include "
netif/ppp/ppp_opts.h
"
26
#if PPP_SUPPORT && VJ_SUPPORT
/* don't build if not configured for use in lwipopts.h */
27
28
#ifndef VJ_H
29
#define VJ_H
30
31
#include "
lwip/ip.h
"
32
#include "
lwip/priv/tcp_priv.h
"
33
34
#ifdef __cplusplus
35
extern
"C"
{
36
#endif
37
38
#define MAX_SLOTS 16
/* must be > 2 and < 256 */
39
#define MAX_HDR 128
40
41
/*
42
* Compressed packet format:
43
*
44
* The first octet contains the packet type (top 3 bits), TCP
45
* 'push' bit, and flags that indicate which of the 4 TCP sequence
46
* numbers have changed (bottom 5 bits). The next octet is a
47
* conversation number that associates a saved IP/TCP header with
48
* the compressed packet. The next two octets are the TCP checksum
49
* from the original datagram. The next 0 to 15 octets are
50
* sequence number changes, one change per bit set in the header
51
* (there may be no changes and there are two special cases where
52
* the receiver implicitly knows what changed -- see below).
53
*
54
* There are 5 numbers which can change (they are always inserted
55
* in the following order): TCP urgent pointer, window,
56
* acknowlegement, sequence number and IP ID. (The urgent pointer
57
* is different from the others in that its value is sent, not the
58
* change in value.) Since typical use of SLIP links is biased
59
* toward small packets (see comments on MTU/MSS below), changes
60
* use a variable length coding with one octet for numbers in the
61
* range 1 - 255 and 3 octets (0, MSB, LSB) for numbers in the
62
* range 256 - 65535 or 0. (If the change in sequence number or
63
* ack is more than 65535, an uncompressed packet is sent.)
64
*/
65
66
/*
67
* Packet types (must not conflict with IP protocol version)
68
*
69
* The top nibble of the first octet is the packet type. There are
70
* three possible types: IP (not proto TCP or tcp with one of the
71
* control flags set); uncompressed TCP (a normal IP/TCP packet but
72
* with the 8-bit protocol field replaced by an 8-bit connection id --
73
* this type of packet syncs the sender & receiver); and compressed
74
* TCP (described above).
75
*
76
* LSB of 4-bit field is TCP "PUSH" bit (a worthless anachronism) and
77
* is logically part of the 4-bit "changes" field that follows. Top
78
* three bits are actual packet type. For backward compatibility
79
* and in the interest of conserving bits, numbers are chosen so the
80
* IP protocol version number (4) which normally appears in this nibble
81
* means "IP packet".
82
*/
83
84
/* packet types */
85
#define TYPE_IP 0x40
86
#define TYPE_UNCOMPRESSED_TCP 0x70
87
#define TYPE_COMPRESSED_TCP 0x80
88
#define TYPE_ERROR 0x00
89
90
/* Bits in first octet of compressed packet */
91
#define NEW_C 0x40
/* flag bits for what changed in a packet */
92
#define NEW_I 0x20
93
#define NEW_S 0x08
94
#define NEW_A 0x04
95
#define NEW_W 0x02
96
#define NEW_U 0x01
97
98
/* reserved, special-case values of above */
99
#define SPECIAL_I (NEW_S|NEW_W|NEW_U)
/* echoed interactive traffic */
100
#define SPECIAL_D (NEW_S|NEW_A|NEW_W|NEW_U)
/* unidirectional data */
101
#define SPECIALS_MASK (NEW_S|NEW_A|NEW_W|NEW_U)
102
103
#define TCP_PUSH_BIT 0x10
104
105
106
/*
107
* "state" data for each active tcp conversation on the wire. This is
108
* basically a copy of the entire IP/TCP header from the last packet
109
* we saw from the conversation together with a small identifier
110
* the transmit & receive ends of the line use to locate saved header.
111
*/
112
struct
cstate {
113
struct
cstate *cs_next;
/* next most recently used state (xmit only) */
114
u16_t
cs_hlen;
/* size of hdr (receive only) */
115
u8_t
cs_id;
/* connection # associated with this state */
116
u8_t
cs_filler;
117
union
{
118
char
csu_hdr[MAX_HDR];
119
struct
ip_hdr
csu_ip;
/* ip/tcp hdr from most recent packet */
120
} vjcs_u;
121
};
122
#define cs_ip vjcs_u.csu_ip
123
#define cs_hdr vjcs_u.csu_hdr
124
125
126
struct
vjstat {
127
u32_t
vjs_packets;
/* outbound packets */
128
u32_t
vjs_compressed;
/* outbound compressed packets */
129
u32_t
vjs_searches;
/* searches for connection state */
130
u32_t
vjs_misses;
/* times couldn't find conn. state */
131
u32_t
vjs_uncompressedin;
/* inbound uncompressed packets */
132
u32_t
vjs_compressedin;
/* inbound compressed packets */
133
u32_t
vjs_errorin;
/* inbound unknown type packets */
134
u32_t
vjs_tossed;
/* inbound packets tossed because of error */
135
};
136
137
/*
138
* all the state data for one serial line (we need one of these per line).
139
*/
140
struct
vjcompress {
141
struct
cstate *last_cs;
/* most recently used tstate */
142
u8_t
last_recv;
/* last rcvd conn. id */
143
u8_t
last_xmit;
/* last sent conn. id */
144
u16_t
flags
;
145
u8_t
maxSlotIndex;
146
u8_t
compressSlot;
/* Flag indicating OK to compress slot ID. */
147
#if LINK_STATS
148
struct
vjstat stats;
149
#endif
150
struct
cstate tstate[MAX_SLOTS];
/* xmit connection states */
151
struct
cstate rstate[MAX_SLOTS];
/* receive connection states */
152
};
153
154
/* flag values */
155
#define VJF_TOSS 1U
/* tossing rcvd frames because of input err */
156
157
extern
void
vj_compress_init (
struct
vjcompress *comp);
158
extern
u8_t
vj_compress_tcp (
struct
vjcompress *comp,
struct
pbuf
**pb);
159
extern
void
vj_uncompress_err (
struct
vjcompress *comp);
160
extern
int
vj_uncompress_uncomp(
struct
pbuf
*nb,
struct
vjcompress *comp);
161
extern
int
vj_uncompress_tcp (
struct
pbuf
**nb,
struct
vjcompress *comp);
162
163
#ifdef __cplusplus
164
}
165
#endif
166
167
#endif
/* VJ_H */
168
169
#endif
/* PPP_SUPPORT && VJ_SUPPORT */
ip.h
flags
GLbitfield flags
Definition:
glext.h:7161
u32_t
uint32_t u32_t
Definition:
arch.h:129
u8_t
uint8_t u8_t
Definition:
arch.h:125
u16_t
uint16_t u16_t
Definition:
arch.h:127
ppp_opts.h
ip_hdr
Definition:
ip4.h:73
pbuf
Definition:
pbuf.h:186
tcp_priv.h
drivers
network
tcpip
lwip
src
include
netif
ppp
vj.h
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