alias_local.h revision 63899 
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 63899 2000-07-26 23:15:46Z archie $
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 *
99FindProtoIn(struct in_addr, struct in_addr, u_char);
100
101struct alias_link *
102FindProtoOut(struct in_addr, struct in_addr, u_char);
103
104struct alias_link *
105FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char);
106
107struct alias_link *
108FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
109
110struct alias_link *
111FindPptpIn(struct in_addr, struct in_addr, u_short);
112
113struct alias_link *
114FindPptpOut(struct in_addr, struct in_addr, u_short);
115
116struct alias_link *
117QueryUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char);
118
119struct alias_link *
120QueryUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
121
122struct alias_link *
123FindRtspOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
124
125struct in_addr
126FindOriginalAddress(struct in_addr);
127
128struct in_addr
129FindAliasAddress(struct in_addr);
130
131/* External data access/modification */
132int FindNewPortGroup(struct in_addr, struct in_addr,
133                     u_short, u_short, u_short, u_char, u_char);
134void GetFragmentAddr(struct alias_link *, struct in_addr *);
135void SetFragmentAddr(struct alias_link *, struct in_addr);
136void GetFragmentPtr(struct alias_link *, char **);
137void SetFragmentPtr(struct alias_link *, char *);
138void SetStateIn(struct alias_link *, int);
139void SetStateOut(struct alias_link *, int);
140int GetStateIn(struct alias_link *);
141int GetStateOut(struct alias_link *);
142struct in_addr GetOriginalAddress(struct alias_link *);
143struct in_addr GetDestAddress(struct alias_link *);
144struct in_addr GetAliasAddress(struct alias_link *);
145struct in_addr GetDefaultAliasAddress(void);
146void SetDefaultAliasAddress(struct in_addr);
147u_short GetOriginalPort(struct alias_link *);
148u_short GetAliasPort(struct alias_link *);
149struct in_addr GetProxyAddress(struct alias_link *);
150void SetProxyAddress(struct alias_link *, struct in_addr);
151u_short GetProxyPort(struct alias_link *);
152void SetProxyPort(struct alias_link *, u_short);
153void SetAckModified(struct alias_link *);
154int GetAckModified(struct alias_link *);
155int GetDeltaAckIn(struct ip *, struct alias_link *);
156int GetDeltaSeqOut(struct ip *, struct alias_link *);
157void AddSeq(struct ip *, struct alias_link *, int);
158void SetExpire(struct alias_link *, int);
159void ClearCheckNewLink(void);
160void SetLastLineCrlfTermed(struct alias_link *, int);
161int GetLastLineCrlfTermed(struct alias_link *);
162#ifndef NO_FW_PUNCH
163void PunchFWHole(struct alias_link *);
164#endif
165
166
167/* Housekeeping function */
168void HouseKeeping(void);
169
170/* Tcp specfic routines */
171/*lint -save -library Suppress flexelint warnings */
172
173/* FTP routines */
174void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
175
176/* IRC routines */
177void AliasHandleIrcOut(struct ip *, struct alias_link *, int);
178
179/* RTSP routines */
180void AliasHandleRtspOut(struct ip *, struct alias_link *, int);
181
182/* PPTP routines */
183int  PptpGetCallID(struct ip *, u_short *);
184void PptpSetCallID(struct ip *, u_short);
185void AliasHandlePptpOut(struct ip *, struct alias_link *);
186void AliasHandlePptpIn(struct ip *, struct alias_link *);
187
188/* NetBIOS routines */
189int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
190int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
191
192/* CUSeeMe routines */
193void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
194void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
195
196/* Transparent proxy routines */
197int ProxyCheck(struct ip *, struct in_addr *, u_short *);
198void ProxyModify(struct alias_link *, struct ip *, int, int);
199
200
201enum alias_tcp_state {
202    ALIAS_TCP_STATE_NOT_CONNECTED,
203    ALIAS_TCP_STATE_CONNECTED,
204    ALIAS_TCP_STATE_DISCONNECTED
205};
206/*lint -restore */
207#endif /* defined(ALIAS_LOCAL_H) */
208