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 $FreeBSD$ 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 60 extern int packetAliasMode; 61 62 63 /* 64 Structs 65 */ 66 67 struct alias_link; /* Incomplete structure */ 68 69 70 /* 71 Prototypes 72 */ 73 74 /* General utilities */ 75 u_short IpChecksum(struct ip *); 76 u_short TcpChecksum(struct ip *); 77 void DifferentialChecksum(u_short *, u_short *, u_short *, int); 78 79 /* Internal data access */ 80 struct alias_link * 81 FindIcmpIn(struct in_addr, struct in_addr, u_short); 82 83 struct alias_link * 84 FindIcmpOut(struct in_addr, struct in_addr, u_short); 85 86 struct alias_link * 87 FindFragmentIn1(struct in_addr, struct in_addr, u_short); 88 89 struct alias_link * 90 FindFragmentIn2(struct in_addr, struct in_addr, u_short); 91 92 struct alias_link * 93 AddFragmentPtrLink(struct in_addr, u_short); 94 95 struct alias_link * 96 FindFragmentPtr(struct in_addr, u_short); 97 98 struct alias_link * 99 FindProtoIn(struct in_addr, struct in_addr, u_char); 100 101 struct alias_link * 102 FindProtoOut(struct in_addr, struct in_addr, u_char); 103 104 struct alias_link * 105 FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char); 106 107 struct alias_link * 108 FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char); 109 110 struct in_addr 111 FindOriginalAddress(struct in_addr); 112 113 struct in_addr 114 FindAliasAddress(struct in_addr); 115 116 /* External data access/modification */ 117 void GetFragmentAddr(struct alias_link *, struct in_addr *); 118 void SetFragmentAddr(struct alias_link *, struct in_addr); 119 void GetFragmentPtr(struct alias_link *, char **); 120 void SetFragmentPtr(struct alias_link *, char *); 121 void SetStateIn(struct alias_link *, int); 122 void SetStateOut(struct alias_link *, int); 123 int GetStateIn(struct alias_link *); 124 int GetStateOut(struct alias_link *); 125 struct in_addr GetOriginalAddress(struct alias_link *); 126 struct in_addr GetDestAddress(struct alias_link *); 127 struct in_addr GetAliasAddress(struct alias_link *); 128 struct in_addr GetDefaultAliasAddress(void); 129 void SetDefaultAliasAddress(struct in_addr); 130 u_short GetOriginalPort(struct alias_link *); 131 u_short GetAliasPort(struct alias_link *); 132 struct in_addr GetProxyAddress(struct alias_link *); 133 void SetProxyAddress(struct alias_link *, struct in_addr); 134 u_short GetProxyPort(struct alias_link *); 135 void SetProxyPort(struct alias_link *, u_short); 136 void SetAckModified(struct alias_link *); 137 int GetAckModified(struct alias_link *); 138 int GetDeltaAckIn(struct ip *, struct alias_link *); 139 int GetDeltaSeqOut(struct ip *, struct alias_link *); 140 void AddSeq(struct ip *, struct alias_link *, int); 141 void SetExpire(struct alias_link *, int); 142 void ClearCheckNewLink(void); 143 #ifndef NO_FW_PUNCH 144 void PunchFWHole(struct alias_link *); 145 #endif 146 147 148 /* Housekeeping function */ 149 void HouseKeeping(void); 150 151 /* Tcp specfic routines */ 152 /*lint -save -library Suppress flexelint warnings */ 153 154 /* FTP routines */ 155 void AliasHandleFtpOut(struct ip *, struct alias_link *, int); 156 157 /* IRC routines */ 158 void AliasHandleIrcOut(struct ip *, struct alias_link *, int); 159 160 /* NetBIOS routines */ 161 int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short); 162 int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *); 163 164 /* CUSeeMe routines */ 165 void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *); 166 void AliasHandleCUSeeMeIn(struct ip *, struct in_addr); 167 168 /* Transparent proxy routines */ 169 int ProxyCheck(struct ip *, struct in_addr *, u_short *); 170 void ProxyModify(struct alias_link *, struct ip *, int, int); 171 172 173 enum 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