alias_local.h revision 59356 
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 59356 2000-04-18 10:18:21Z 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 *
99FindPptpIn(struct in_addr, struct in_addr);
100
101struct alias_link *
102FindPptpOut(struct in_addr, struct in_addr);
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 in_addr
111FindOriginalAddress(struct in_addr);
112
113struct in_addr
114FindAliasAddress(struct in_addr);
115
116/* External data access/modification */
117void GetFragmentAddr(struct alias_link *, struct in_addr *);
118void SetFragmentAddr(struct alias_link *, struct in_addr);
119void GetFragmentPtr(struct alias_link *, char **);
120void SetFragmentPtr(struct alias_link *, char *);
121void SetStateIn(struct alias_link *, int);
122void SetStateOut(struct alias_link *, int);
123int GetStateIn(struct alias_link *);
124int GetStateOut(struct alias_link *);
125struct in_addr GetOriginalAddress(struct alias_link *);
126struct in_addr GetDestAddress(struct alias_link *);
127struct in_addr GetAliasAddress(struct alias_link *);
128struct in_addr GetDefaultAliasAddress(void);
129void SetDefaultAliasAddress(struct in_addr);
130u_short GetOriginalPort(struct alias_link *);
131u_short GetAliasPort(struct alias_link *);
132struct in_addr GetProxyAddress(struct alias_link *);
133void SetProxyAddress(struct alias_link *, struct in_addr);
134u_short GetProxyPort(struct alias_link *);
135void SetProxyPort(struct alias_link *, u_short);
136void SetAckModified(struct alias_link *);
137int GetAckModified(struct alias_link *);
138int GetDeltaAckIn(struct ip *, struct alias_link *);
139int GetDeltaSeqOut(struct ip *, struct alias_link *);
140void AddSeq(struct ip *, struct alias_link *, int);
141void SetExpire(struct alias_link *, int);
142void ClearCheckNewLink(void);
143#ifndef NO_FW_PUNCH
144void PunchFWHole(struct alias_link *);
145#endif
146
147
148/* Housekeeping function */
149void HouseKeeping(void);
150
151/* Tcp specfic routines */
152/*lint -save -library Suppress flexelint warnings */
153
154/* FTP routines */
155void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
156
157/* IRC routines */
158void AliasHandleIrcOut(struct ip *, struct alias_link *, int);
159
160/* NetBIOS routines */
161int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
162int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
163
164/* CUSeeMe routines */
165void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
166void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);
167
168/* Transparent proxy routines */
169int ProxyCheck(struct ip *, struct in_addr *, u_short *);
170void ProxyModify(struct alias_link *, struct ip *, int, int);
171
172
173enum alias_tcp_state {
174    ALIAS_TCP_STATE_NOT_CONNECTED,
175    ALIAS_TCP_STATE_CONNECTED,
176    ALIAS_TCP_STATE_DISCONNECTED
177};
178/*lint -restore */
179#endif /* defined(ALIAS_LOCAL_H) */
180