alias_local.h revision 145925
1/*- 2 * Copyright (c) 2001 Charles Mott <cm@linktel.net> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/netinet/libalias/alias_local.h 145925 2005-05-05 20:22:09Z glebius $ 27 */ 28 29/* 30 * Alias_local.h contains the function prototypes for alias.c, 31 * alias_db.c, alias_util.c and alias_ftp.c, alias_irc.c (as well 32 * as any future add-ons). It also includes macros, globals and 33 * struct definitions shared by more than one alias*.c file. 34 * 35 * This include file is intended to be used only within the aliasing 36 * software. Outside world interfaces are defined in alias.h 37 * 38 * This software is placed into the public domain with no restrictions 39 * on its distribution. 40 * 41 * Initial version: August, 1996 (cjm) 42 * 43 * <updated several times by original author and Eivind Eklund> 44 */ 45 46#ifndef _ALIAS_LOCAL_H_ 47#define _ALIAS_LOCAL_H_ 48 49#include <sys/queue.h> 50 51/* Sizes of input and output link tables */ 52#define LINK_TABLE_OUT_SIZE 101 53#define LINK_TABLE_IN_SIZE 4001 54 55struct proxy_entry; 56 57struct libalias { 58 LIST_ENTRY(libalias) instancelist; 59 60 int packetAliasMode; /* Mode flags */ 61 /* - documented in alias.h */ 62 63 struct in_addr aliasAddress; /* Address written onto source */ 64 /* field of IP packet. */ 65 66 struct in_addr targetAddress; /* IP address incoming packets */ 67 /* are sent to if no aliasing */ 68 /* link already exists */ 69 70 struct in_addr nullAddress; /* Used as a dummy parameter for */ 71 /* some function calls */ 72 73 LIST_HEAD (, alias_link) linkTableOut[LINK_TABLE_OUT_SIZE]; 74 /* Lookup table of pointers to */ 75 /* chains of link records. Each */ 76 77 LIST_HEAD (, alias_link) linkTableIn[LINK_TABLE_IN_SIZE]; 78 /* link record is doubly indexed */ 79 /* into input and output lookup */ 80 /* tables. */ 81 82 /* Link statistics */ 83 int icmpLinkCount; 84 int udpLinkCount; 85 int tcpLinkCount; 86 int pptpLinkCount; 87 int protoLinkCount; 88 int fragmentIdLinkCount; 89 int fragmentPtrLinkCount; 90 int sockCount; 91 92 int cleanupIndex; /* Index to chain of link table */ 93 /* being inspected for old links */ 94 95 int timeStamp; /* System time in seconds for */ 96 /* current packet */ 97 98 int lastCleanupTime; /* Last time 99 * IncrementalCleanup() */ 100 /* was called */ 101 102 int houseKeepingResidual; /* used by HouseKeeping() */ 103 104 int deleteAllLinks; /* If equal to zero, DeleteLink() */ 105 /* will not remove permanent links */ 106#ifndef NO_LOGGING 107 FILE *monitorFile; /* File descriptor for link */ 108#endif 109 /* statistics monitoring file */ 110 111 int newDefaultLink; /* Indicates if a new aliasing */ 112 /* link has been created after a */ 113 /* call to PacketAliasIn/Out(). */ 114 115#ifndef NO_FW_PUNCH 116 int fireWallFD; /* File descriptor to be able to */ 117 /* control firewall. Opened by */ 118 /* PacketAliasSetMode on first */ 119 /* setting the PKT_ALIAS_PUNCH_FW */ 120 /* flag. */ 121 int fireWallBaseNum; /* The first firewall entry 122 * free for our use */ 123 int fireWallNumNums; /* How many entries can we 124 * use? */ 125 int fireWallActiveNum; /* Which entry did we last 126 * use? */ 127 char *fireWallField; /* bool array for entries */ 128#endif 129 130 unsigned int skinnyPort; /* TCP port used by the Skinny */ 131 /* protocol. */ 132 133 struct proxy_entry *proxyList; 134 135 struct in_addr true_addr; /* in network byte order. */ 136 u_short true_port; /* in host byte order. */ 137 138}; 139 140/* Macros */ 141 142/* 143 * The following macro is used to update an 144 * internet checksum. "delta" is a 32-bit 145 * accumulation of all the changes to the 146 * checksum (adding in new 16-bit words and 147 * subtracting out old words), and "cksum" 148 * is the checksum value to be updated. 149 */ 150#define ADJUST_CHECKSUM(acc, cksum) \ 151 do { \ 152 acc += cksum; \ 153 if (acc < 0) { \ 154 acc = -acc; \ 155 acc = (acc >> 16) + (acc & 0xffff); \ 156 acc += acc >> 16; \ 157 cksum = (u_short) ~acc; \ 158 } else { \ 159 acc = (acc >> 16) + (acc & 0xffff); \ 160 acc += acc >> 16; \ 161 cksum = (u_short) acc; \ 162 } \ 163 } while (0) 164 165 166/* Prototypes */ 167 168/* General utilities */ 169u_short IpChecksum(struct ip *_pip); 170u_short TcpChecksum(struct ip *_pip); 171void 172DifferentialChecksum(u_short * _cksum, void * _new, void * _old, int _n); 173 174/* Internal data access */ 175struct alias_link * 176FindIcmpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 177 u_short _id_alias, int _create); 178struct alias_link * 179FindIcmpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 180 u_short _id, int _create); 181struct alias_link * 182FindFragmentIn1(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 183 u_short _ip_id); 184struct alias_link * 185FindFragmentIn2(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 186 u_short _ip_id); 187struct alias_link * 188 AddFragmentPtrLink(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id); 189struct alias_link * 190 FindFragmentPtr(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id); 191struct alias_link * 192FindProtoIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 193 u_char _proto); 194struct alias_link * 195FindProtoOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 196 u_char _proto); 197struct alias_link * 198FindUdpTcpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 199 u_short _dst_port, u_short _alias_port, u_char _proto, int _create); 200struct alias_link * 201FindUdpTcpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 202 u_short _src_port, u_short _dst_port, u_char _proto, int _create); 203struct alias_link * 204AddPptp(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 205 struct in_addr _alias_addr, u_int16_t _src_call_id); 206struct alias_link * 207FindPptpOutByCallId(struct libalias *la, struct in_addr _src_addr, 208 struct in_addr _dst_addr, u_int16_t _src_call_id); 209struct alias_link * 210FindPptpInByCallId(struct libalias *la, struct in_addr _dst_addr, 211 struct in_addr _alias_addr, u_int16_t _dst_call_id); 212struct alias_link * 213FindPptpOutByPeerCallId(struct libalias *la, struct in_addr _src_addr, 214 struct in_addr _dst_addr, u_int16_t _dst_call_id); 215struct alias_link * 216FindPptpInByPeerCallId(struct libalias *la, struct in_addr _dst_addr, 217 struct in_addr _alias_addr, u_int16_t _alias_call_id); 218struct alias_link * 219FindRtspOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 220 u_short _src_port, u_short _alias_port, u_char _proto); 221struct in_addr 222 FindOriginalAddress(struct libalias *la, struct in_addr _alias_addr); 223struct in_addr 224 FindAliasAddress(struct libalias *la, struct in_addr _original_addr); 225 226/* External data access/modification */ 227int 228FindNewPortGroup(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 229 u_short _src_port, u_short _dst_port, u_short _port_count, 230 u_char _proto, u_char _align); 231void GetFragmentAddr(struct alias_link *_lnk, struct in_addr *_src_addr); 232void SetFragmentAddr(struct alias_link *_lnk, struct in_addr _src_addr); 233void GetFragmentPtr(struct alias_link *_lnk, char **_fptr); 234void SetFragmentPtr(struct alias_link *_lnk, char *fptr); 235void SetStateIn(struct alias_link *_lnk, int _state); 236void SetStateOut(struct alias_link *_lnk, int _state); 237int GetStateIn (struct alias_link *_lnk); 238int GetStateOut(struct alias_link *_lnk); 239struct in_addr 240 GetOriginalAddress(struct alias_link *_lnk); 241struct in_addr 242 GetDestAddress(struct alias_link *_lnk); 243struct in_addr 244 GetAliasAddress(struct alias_link *_lnk); 245struct in_addr 246 GetDefaultAliasAddress(struct libalias *la); 247void SetDefaultAliasAddress(struct libalias *la, struct in_addr _alias_addr); 248u_short GetOriginalPort(struct alias_link *_lnk); 249u_short GetAliasPort(struct alias_link *_lnk); 250struct in_addr 251 GetProxyAddress(struct alias_link *_lnk); 252void SetProxyAddress(struct alias_link *_lnk, struct in_addr _addr); 253u_short GetProxyPort(struct alias_link *_lnk); 254void SetProxyPort(struct alias_link *_lnk, u_short _port); 255void SetAckModified(struct alias_link *_lnk); 256int GetAckModified(struct alias_link *_lnk); 257int GetDeltaAckIn(struct ip *_pip, struct alias_link *_lnk); 258int GetDeltaSeqOut(struct ip *_pip, struct alias_link *_lnk); 259void AddSeq (struct ip *_pip, struct alias_link *_lnk, int _delta); 260void SetExpire (struct alias_link *_lnk, int _expire); 261void ClearCheckNewLink(struct libalias *la); 262void SetProtocolFlags(struct alias_link *_lnk, int _pflags); 263int GetProtocolFlags(struct alias_link *_lnk); 264void SetDestCallId(struct alias_link *_lnk, u_int16_t _cid); 265 266#ifndef NO_FW_PUNCH 267void PunchFWHole(struct alias_link *_lnk); 268 269#endif 270 271/* Housekeeping function */ 272void HouseKeeping(struct libalias *); 273 274/* Tcp specfic routines */ 275/* lint -save -library Suppress flexelint warnings */ 276 277/* FTP routines */ 278void 279AliasHandleFtpOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 280 int _maxpacketsize); 281 282/* IRC routines */ 283void 284AliasHandleIrcOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 285 int _maxsize); 286 287/* RTSP routines */ 288void 289AliasHandleRtspOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 290 int _maxpacketsize); 291 292/* PPTP routines */ 293void AliasHandlePptpOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); 294void AliasHandlePptpIn(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); 295int AliasHandlePptpGreOut(struct libalias *la, struct ip *_pip); 296int AliasHandlePptpGreIn(struct libalias *la, struct ip *_pip); 297 298/* NetBIOS routines */ 299int 300AliasHandleUdpNbt(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 301 struct in_addr *_alias_address, u_short _alias_port); 302int 303AliasHandleUdpNbtNS(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 304 struct in_addr *_alias_address, u_short * _alias_port, 305 struct in_addr *_original_address, u_short * _original_port); 306 307/* CUSeeMe routines */ 308void AliasHandleCUSeeMeOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); 309void AliasHandleCUSeeMeIn(struct libalias *la, struct ip *_pip, struct in_addr _original_addr); 310 311/* Skinny routines */ 312void AliasHandleSkinny(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); 313 314/* Transparent proxy routines */ 315int 316ProxyCheck(struct libalias *la, struct ip *_pip, struct in_addr *_proxy_server_addr, 317 u_short * _proxy_server_port); 318void 319ProxyModify(struct libalias *la, struct alias_link *_lnk, struct ip *_pip, 320 int _maxpacketsize, int _proxy_type); 321 322enum alias_tcp_state { 323 ALIAS_TCP_STATE_NOT_CONNECTED, 324 ALIAS_TCP_STATE_CONNECTED, 325 ALIAS_TCP_STATE_DISCONNECTED 326}; 327 328#if defined(_NETINET_IP_H_) 329static __inline void * 330ip_next(struct ip *iphdr) 331{ 332 char *p = (char *)iphdr; 333 return (&p[iphdr->ip_hl * 4]); 334} 335#endif 336 337#if defined(_NETINET_TCP_H_) 338static __inline void * 339tcp_next(struct tcphdr *tcphdr) 340{ 341 char *p = (char *)tcphdr; 342 return (&p[tcphdr->th_off * 4]); 343} 344#endif 345 346#if defined(_NETINET_UDP_H_) 347static __inline void * 348udp_next(struct udphdr *udphdr) 349{ 350 return ((void *)(udphdr + 1)); 351} 352#endif 353 354/*lint -restore */ 355 356#endif /* !_ALIAS_LOCAL_H_ */ 357