alias_local.h revision 61861
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 61861 2000-06-20 11:41:48Z 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 * 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 in_addr 117FindOriginalAddress(struct in_addr); 118 119struct in_addr 120FindAliasAddress(struct in_addr); 121 122/* External data access/modification */ 123void GetFragmentAddr(struct alias_link *, struct in_addr *); 124void SetFragmentAddr(struct alias_link *, struct in_addr); 125void GetFragmentPtr(struct alias_link *, char **); 126void SetFragmentPtr(struct alias_link *, char *); 127void SetStateIn(struct alias_link *, int); 128void SetStateOut(struct alias_link *, int); 129int GetStateIn(struct alias_link *); 130int GetStateOut(struct alias_link *); 131struct in_addr GetOriginalAddress(struct alias_link *); 132struct in_addr GetDestAddress(struct alias_link *); 133struct in_addr GetAliasAddress(struct alias_link *); 134struct in_addr GetDefaultAliasAddress(void); 135void SetDefaultAliasAddress(struct in_addr); 136u_short GetOriginalPort(struct alias_link *); 137u_short GetAliasPort(struct alias_link *); 138struct in_addr GetProxyAddress(struct alias_link *); 139void SetProxyAddress(struct alias_link *, struct in_addr); 140u_short GetProxyPort(struct alias_link *); 141void SetProxyPort(struct alias_link *, u_short); 142void SetAckModified(struct alias_link *); 143int GetAckModified(struct alias_link *); 144int GetDeltaAckIn(struct ip *, struct alias_link *); 145int GetDeltaSeqOut(struct ip *, struct alias_link *); 146void AddSeq(struct ip *, struct alias_link *, int); 147void SetExpire(struct alias_link *, int); 148void ClearCheckNewLink(void); 149void SetLastLineCrlfTermed(struct alias_link *, int); 150int GetLastLineCrlfTermed(struct alias_link *); 151#ifndef NO_FW_PUNCH 152void PunchFWHole(struct alias_link *); 153#endif 154 155 156/* Housekeeping function */ 157void HouseKeeping(void); 158 159/* Tcp specfic routines */ 160/*lint -save -library Suppress flexelint warnings */ 161 162/* FTP routines */ 163void AliasHandleFtpOut(struct ip *, struct alias_link *, int); 164 165/* IRC routines */ 166void AliasHandleIrcOut(struct ip *, struct alias_link *, int); 167 168/* PPTP routines */ 169int PptpGetCallID(struct ip *, u_short *); 170void PptpSetCallID(struct ip *, u_short); 171void AliasHandlePptpOut(struct ip *, struct alias_link *); 172void AliasHandlePptpIn(struct ip *, struct alias_link *); 173 174/* NetBIOS routines */ 175int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short); 176int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *); 177 178/* CUSeeMe routines */ 179void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *); 180void AliasHandleCUSeeMeIn(struct ip *, struct in_addr); 181 182/* Transparent proxy routines */ 183int ProxyCheck(struct ip *, struct in_addr *, u_short *); 184void ProxyModify(struct alias_link *, struct ip *, int, int); 185 186 187enum alias_tcp_state { 188 ALIAS_TCP_STATE_NOT_CONNECTED, 189 ALIAS_TCP_STATE_CONNECTED, 190 ALIAS_TCP_STATE_DISCONNECTED 191}; 192/*lint -restore */ 193#endif /* defined(ALIAS_LOCAL_H) */ 194