alias_local.h revision 59046 
1/* -*- mode: c; tab-width: 3; c-basic-offset: 3; -*-
2    Alias_local.h contains the function prototypes for alias.c,
3    alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well
4    as any future add-ons).  It also includes macros, globals and
5    struct definitions shared by more than one alias*.c file.
6
7    This include file is intended to be used only within the aliasing
8    software.  Outside world interfaces are defined in alias.h
9
10    This software is placed into the public domain with no restrictions
11    on its distribution.
12
13    Initial version:  August, 1996  (cjm)
14
15     <updated several times by original author and Eivind Eklund>
16
17    $FreeBSD: head/sys/netinet/libalias/alias_local.h 59046 2000-04-05 14:23:42Z ru $
18*/
19#ifndef ALIAS_LOCAL_H
20#define ALIAS_LOCAL_H
21
22#ifndef NULL
23#define NULL 0
24#endif
25
26/*
27    Macros
28 */
29
30/*
31   The following macro is used to update an
32   internet checksum.  "delta" is a 32-bit
33   accumulation of all the changes to the
34   checksum (adding in new 16-bit words and
35   subtracting out old words), and "cksum"
36   is the checksum value to be updated.
37*/
38#define ADJUST_CHECKSUM(acc, cksum) { \
39    acc += cksum; \
40    if (acc < 0) \
41    { \
42        acc = -acc; \
43        acc = (acc >> 16) + (acc & 0xffff); \
44        acc += acc >> 16; \
45        cksum = (u_short) ~acc; \
46    } \
47    else \
48    { \
49        acc = (acc >> 16) + (acc & 0xffff); \
50        acc += acc >> 16; \
51        cksum = (u_short) acc; \
52    } \
53}
54
55
56/*
57    Globals
58*/
59
60extern int packetAliasMode;
61
62
63/*
64    Structs
65*/
66
67struct alias_link;    /* Incomplete structure */
68
69
70/*
71    Prototypes
72*/
73
74/* General utilities */
75u_short IpChecksum(struct ip *);
76u_short TcpChecksum(struct ip *);
77void DifferentialChecksum(u_short *, u_short *, u_short *, int);
78
79/* Internal data access */
80struct alias_link *
81FindIcmpIn(struct in_addr, struct in_addr, u_short);
82
83struct alias_link *
84FindIcmpOut(struct in_addr, struct in_addr, u_short);
85
86struct alias_link *
87FindFragmentIn1(struct in_addr, struct in_addr, u_short);
88
89struct alias_link *
90FindFragmentIn2(struct in_addr, struct in_addr, u_short);
91
92struct alias_link *
93AddFragmentPtrLink(struct in_addr, u_short);
94
95struct alias_link *
96FindFragmentPtr(struct in_addr, u_short);
97
98struct alias_link *
99FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char);
100
101struct alias_link *
102FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
103
104struct in_addr
105FindOriginalAddress(struct in_addr);
106
107struct in_addr
108FindAliasAddress(struct in_addr);
109
110/* External data access/modification */
111void GetFragmentAddr(struct alias_link *, struct in_addr *);
112void SetFragmentAddr(struct alias_link *, struct in_addr);
113void GetFragmentPtr(struct alias_link *, char **);
114void SetFragmentPtr(struct alias_link *, char *);
115void SetStateIn(struct alias_link *, int);
116void SetStateOut(struct alias_link *, int);
117int GetStateIn(struct alias_link *);
118int GetStateOut(struct alias_link *);
119struct in_addr GetOriginalAddress(struct alias_link *);
120struct in_addr GetDestAddress(struct alias_link *);
121struct in_addr GetAliasAddress(struct alias_link *);
122struct in_addr GetDefaultAliasAddress(void);
123void SetDefaultAliasAddress(struct in_addr);
124u_short GetOriginalPort(struct alias_link *);
125u_short GetAliasPort(struct alias_link *);
126struct in_addr GetProxyAddress(struct alias_link *);
127void SetProxyAddress(struct alias_link *, struct in_addr);
128u_short GetProxyPort(struct alias_link *);
129void SetProxyPort(struct alias_link *, u_short);
130void SetAckModified(struct alias_link *);
131int GetAckModified(struct alias_link *);
132int GetDeltaAckIn(struct ip *, struct alias_link *);
133int GetDeltaSeqOut(struct ip *, struct alias_link *);
134void AddSeq(struct ip *, struct alias_link *, int);
135void SetExpire(struct alias_link *, int);
136void ClearCheckNewLink(void);
137#ifndef NO_FW_PUNCH
138void PunchFWHole(struct alias_link *);
139#endif
140
141
142/* Housekeeping function */
143void HouseKeeping(void);
144
145/* Tcp specfic routines */
146/*lint -save -library Suppress flexelint warnings */
147
148/* FTP routines */
149void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
150
151/* IRC routines */
152void AliasHandleIrcOut(struct ip *, struct alias_link *, int);
153
154/* NetBIOS routines */
155int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
156int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
157
158/* CUSeeMe routines */
159void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
160void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
161
162/* Transparent proxy routines */
163int ProxyCheck(struct ip *, struct in_addr *, u_short *);
164void ProxyModify(struct alias_link *, struct ip *, int, int);
165
166
167enum alias_tcp_state {
168    ALIAS_TCP_STATE_NOT_CONNECTED,
169    ALIAS_TCP_STATE_CONNECTED,
170    ALIAS_TCP_STATE_DISCONNECTED
171};
172
173int GetPptpAlias (struct in_addr*);
174/*lint -restore */
175#endif /* defined(ALIAS_LOCAL_H) */
176