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 23 /* 24 Macros 25 */ 26 27 /* 28 The following macro is used to update an 29 internet checksum. "delta" is a 32-bit 30 accumulation of all the changes to the 31 checksum (adding in new 16-bit words and 32 subtracting out old words), and "cksum" 33 is the checksum value to be updated. 34 */ 35 #define ADJUST_CHECKSUM(acc, cksum) { \ 36 acc += cksum; \ 37 if (acc < 0) \ 38 { \ 39 acc = -acc; \ 40 acc = (acc >> 16) + (acc & 0xffff); \ 41 acc += acc >> 16; \ 42 cksum = (u_short) ~acc; \ 43 } \ 44 else \ 45 { \ 46 acc = (acc >> 16) + (acc & 0xffff); \ 47 acc += acc >> 16; \ 48 cksum = (u_short) acc; \ 49 } \ 50 } 51 52 53 /* 54 Globals 55 */ 56 57 extern int packetAliasMode; 58 59 60 /* 61 Structs 62 */ 63 64 struct alias_link; /* Incomplete structure */ 65 66 67 /* 68 Prototypes 69 */ 70 71 /* General utilities */ 72 u_short IpChecksum(struct ip *); 73 u_short TcpChecksum(struct ip *); 74 void DifferentialChecksum(u_short *, u_short *, u_short *, int); 75 76 /* Internal data access */ 77 struct alias_link * 78 FindIcmpIn(struct in_addr, struct in_addr, u_short); 79 80 struct alias_link * 81 FindIcmpOut(struct in_addr, struct in_addr, u_short); 82 83 struct alias_link * 84 FindFragmentIn1(struct in_addr, struct in_addr, u_short); 85 86 struct alias_link * 87 FindFragmentIn2(struct in_addr, struct in_addr, u_short); 88 89 struct alias_link * 90 AddFragmentPtrLink(struct in_addr, u_short); 91 92 struct alias_link * 93 FindFragmentPtr(struct in_addr, u_short); 94 95 struct alias_link * 96 FindUdpTcpIn (struct in_addr, struct in_addr, u_short, u_short, u_char); 97 98 struct alias_link * 99 FindUdpTcpOut(struct in_addr, struct in_addr, u_short, u_short, u_char); 100 101 struct in_addr 102 FindOriginalAddress(struct in_addr); 103 104 struct in_addr 105 FindAliasAddress(struct in_addr); 106 107 /* External data access/modification */ 108 void GetFragmentAddr(struct alias_link *, struct in_addr *); 109 void SetFragmentAddr(struct alias_link *, struct in_addr); 110 void GetFragmentPtr(struct alias_link *, char **); 111 void SetFragmentPtr(struct alias_link *, char *); 112 void SetStateIn(struct alias_link *, int); 113 void SetStateOut(struct alias_link *, int); 114 int GetStateIn(struct alias_link *); 115 int GetStateOut(struct alias_link *); 116 struct in_addr GetOriginalAddress(struct alias_link *); 117 struct in_addr GetDestAddress(struct alias_link *); 118 struct in_addr GetAliasAddress(struct alias_link *); 119 struct in_addr GetDefaultAliasAddress(void); 120 void SetDefaultAliasAddress(struct in_addr); 121 u_short GetOriginalPort(struct alias_link *); 122 u_short GetAliasPort(struct alias_link *); 123 struct in_addr GetProxyAddress(struct alias_link *); 124 void SetProxyAddress(struct alias_link *, struct in_addr); 125 u_short GetProxyPort(struct alias_link *); 126 void SetProxyPort(struct alias_link *, u_short); 127 void SetAckModified(struct alias_link *); 128 int GetAckModified(struct alias_link *); 129 int GetDeltaAckIn(struct ip *, struct alias_link *); 130 int GetDeltaSeqOut(struct ip *, struct alias_link *); 131 void AddSeq(struct ip *, struct alias_link *, int); 132 void SetExpire(struct alias_link *, int); 133 void ClearCheckNewLink(void); 134 #ifndef NO_FW_PUNCH 135 void PunchFWHole(struct alias_link *); 136 #endif 137 138 139 /* Housekeeping function */ 140 void HouseKeeping(void); 141 142 /* Tcp specfic routines */ 143 /*lint -save -library Suppress flexelint warnings */ 144 145 /* FTP routines */ 146 void AliasHandleFtpOut(struct ip *, struct alias_link *, int); 147 148 /* IRC routines */ 149 void AliasHandleIrcOut(struct ip *, struct alias_link *, int); 150 151 /* NetBIOS routines */ 152 int AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short); 153 int AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *); 154 155 /* CUSeeMe routines */ 156 void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *); 157 void AliasHandleCUSeeMeIn(struct ip *, struct in_addr); 158 159 /* Transparent proxy routines */ 160 int ProxyCheck(struct ip *, struct in_addr *, u_short *); 161 void ProxyModify(struct alias_link *, struct ip *, int, int); 162 163 164 enum alias_tcp_state { 165 ALIAS_TCP_STATE_NOT_CONNECTED, 166 ALIAS_TCP_STATE_CONNECTED, 167 ALIAS_TCP_STATE_DISCONNECTED 168 }; 169 170 int GetPptpAlias (struct in_addr*); 171 /*lint -restore */ 172 #endif /* defined(ALIAS_LOCAL_H) */ 173