alias_local.h revision 67980 
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 67980 2000-10-30 17:24:12Z 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, int);
82
83struct alias_link *
84FindIcmpOut(struct in_addr, struct in_addr, u_short, int);
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, int);
106
107struct alias_link *
108FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char, int);
109
110struct alias_link *
111AddPptp(struct in_addr, struct in_addr, struct in_addr, u_int16_t);
112
113struct alias_link *
114FindPptpOutByCallId(struct in_addr, struct in_addr, u_int16_t);
115
116struct alias_link *
117FindPptpInByCallId(struct in_addr, struct in_addr, u_int16_t);
118
119struct alias_link *
120FindPptpOutByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
121
122struct alias_link *
123FindPptpInByPeerCallId(struct in_addr, struct in_addr, u_int16_t);
124
125struct alias_link *
126FindRtspOut(struct in_addr, struct in_addr, u_short, u_short, u_char);
127
128struct in_addr
129FindOriginalAddress(struct in_addr);
130
131struct in_addr
132FindAliasAddress(struct in_addr);
133
134/* External data access/modification */
135int FindNewPortGroup(struct in_addr, struct in_addr,
136                     u_short, u_short, u_short, u_char, u_char);
137void GetFragmentAddr(struct alias_link *, struct in_addr *);
138void SetFragmentAddr(struct alias_link *, struct in_addr);
139void GetFragmentPtr(struct alias_link *, char **);
140void SetFragmentPtr(struct alias_link *, char *);
141void SetStateIn(struct alias_link *, int);
142void SetStateOut(struct alias_link *, int);
143int GetStateIn(struct alias_link *);
144int GetStateOut(struct alias_link *);
145struct in_addr GetOriginalAddress(struct alias_link *);
146struct in_addr GetDestAddress(struct alias_link *);
147struct in_addr GetAliasAddress(struct alias_link *);
148struct in_addr GetDefaultAliasAddress(void);
149void SetDefaultAliasAddress(struct in_addr);
150u_short GetOriginalPort(struct alias_link *);
151u_short GetAliasPort(struct alias_link *);
152struct in_addr GetProxyAddress(struct alias_link *);
153void SetProxyAddress(struct alias_link *, struct in_addr);
154u_short GetProxyPort(struct alias_link *);
155void SetProxyPort(struct alias_link *, u_short);
156void SetAckModified(struct alias_link *);
157int GetAckModified(struct alias_link *);
158int GetDeltaAckIn(struct ip *, struct alias_link *);
159int GetDeltaSeqOut(struct ip *, struct alias_link *);
160void AddSeq(struct ip *, struct alias_link *, int);
161void SetExpire(struct alias_link *, int);
162void ClearCheckNewLink(void);
163void SetLastLineCrlfTermed(struct alias_link *, int);
164int GetLastLineCrlfTermed(struct alias_link *);
165void SetDestCallId(struct alias_link *, u_int16_t);
166#ifndef NO_FW_PUNCH
167void PunchFWHole(struct alias_link *);
168#endif
169
170
171/* Housekeeping function */
172void HouseKeeping(void);
173
174/* Tcp specfic routines */
175/*lint -save -library Suppress flexelint warnings */
176
177/* FTP routines */
178void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
179
180/* IRC routines */
181void AliasHandleIrcOut(struct ip *, struct alias_link *, int);
182
183/* RTSP routines */
184void AliasHandleRtspOut(struct ip *, struct alias_link *, int);
185
186/* PPTP routines */
187void AliasHandlePptpOut(struct ip *, struct alias_link *);
188void AliasHandlePptpIn(struct ip *, struct alias_link *);
189int AliasHandlePptpGreOut(struct ip *);
190int AliasHandlePptpGreIn(struct ip *);
191
192/* NetBIOS routines */
193int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
194int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
195
196/* CUSeeMe routines */
197void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
198void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
199
200/* Transparent proxy routines */
201int ProxyCheck(struct ip *, struct in_addr *, u_short *);
202void ProxyModify(struct alias_link *, struct ip *, int, int);
203
204
205enum alias_tcp_state {
206    ALIAS_TCP_STATE_NOT_CONNECTED,
207    ALIAS_TCP_STATE_CONNECTED,
208    ALIAS_TCP_STATE_DISCONNECTED
209};
210/*lint -restore */
211#endif /* defined(ALIAS_LOCAL_H) */
212