alias_local.h revision 145927
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 145927 2005-05-05 21:05:38Z 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/* Use kernel allocator. */ 52#if defined(_KERNEL) && defined(_SYS_MALLOC_H_) 53MALLOC_DECLARE(M_ALIAS); 54#define malloc(x) malloc(x, M_ALIAS, M_NOWAIT|M_ZERO) 55#define calloc(x, n) malloc(x*n) 56#define free(x) free(x, M_ALIAS) 57#endif 58 59/* XXX: LibAliasSetTarget() uses this constant. */ 60#ifdef _KERNEL 61#define INADDR_NONE 0xffffffff 62#endif 63 64/* Sizes of input and output link tables */ 65#define LINK_TABLE_OUT_SIZE 101 66#define LINK_TABLE_IN_SIZE 4001 67 68struct proxy_entry; 69 70struct libalias { 71 LIST_ENTRY(libalias) instancelist; 72 73 int packetAliasMode; /* Mode flags */ 74 /* - documented in alias.h */ 75 76 struct in_addr aliasAddress; /* Address written onto source */ 77 /* field of IP packet. */ 78 79 struct in_addr targetAddress; /* IP address incoming packets */ 80 /* are sent to if no aliasing */ 81 /* link already exists */ 82 83 struct in_addr nullAddress; /* Used as a dummy parameter for */ 84 /* some function calls */ 85 86 LIST_HEAD (, alias_link) linkTableOut[LINK_TABLE_OUT_SIZE]; 87 /* Lookup table of pointers to */ 88 /* chains of link records. Each */ 89 90 LIST_HEAD (, alias_link) linkTableIn[LINK_TABLE_IN_SIZE]; 91 /* link record is doubly indexed */ 92 /* into input and output lookup */ 93 /* tables. */ 94 95 /* Link statistics */ 96 int icmpLinkCount; 97 int udpLinkCount; 98 int tcpLinkCount; 99 int pptpLinkCount; 100 int protoLinkCount; 101 int fragmentIdLinkCount; 102 int fragmentPtrLinkCount; 103 int sockCount; 104 105 int cleanupIndex; /* Index to chain of link table */ 106 /* being inspected for old links */ 107 108 int timeStamp; /* System time in seconds for */ 109 /* current packet */ 110 111 int lastCleanupTime; /* Last time 112 * IncrementalCleanup() */ 113 /* was called */ 114 115 int houseKeepingResidual; /* used by HouseKeeping() */ 116 117 int deleteAllLinks; /* If equal to zero, DeleteLink() */ 118 /* will not remove permanent links */ 119#ifndef NO_LOGGING 120 FILE *monitorFile; /* File descriptor for link */ 121#endif 122 /* statistics monitoring file */ 123 124 int newDefaultLink; /* Indicates if a new aliasing */ 125 /* link has been created after a */ 126 /* call to PacketAliasIn/Out(). */ 127 128#ifndef NO_FW_PUNCH 129 int fireWallFD; /* File descriptor to be able to */ 130 /* control firewall. Opened by */ 131 /* PacketAliasSetMode on first */ 132 /* setting the PKT_ALIAS_PUNCH_FW */ 133 /* flag. */ 134 int fireWallBaseNum; /* The first firewall entry 135 * free for our use */ 136 int fireWallNumNums; /* How many entries can we 137 * use? */ 138 int fireWallActiveNum; /* Which entry did we last 139 * use? */ 140 char *fireWallField; /* bool array for entries */ 141#endif 142 143 unsigned int skinnyPort; /* TCP port used by the Skinny */ 144 /* protocol. */ 145 146 struct proxy_entry *proxyList; 147 148 struct in_addr true_addr; /* in network byte order. */ 149 u_short true_port; /* in host byte order. */ 150 151}; 152 153/* Macros */ 154 155/* 156 * The following macro is used to update an 157 * internet checksum. "delta" is a 32-bit 158 * accumulation of all the changes to the 159 * checksum (adding in new 16-bit words and 160 * subtracting out old words), and "cksum" 161 * is the checksum value to be updated. 162 */ 163#define ADJUST_CHECKSUM(acc, cksum) \ 164 do { \ 165 acc += cksum; \ 166 if (acc < 0) { \ 167 acc = -acc; \ 168 acc = (acc >> 16) + (acc & 0xffff); \ 169 acc += acc >> 16; \ 170 cksum = (u_short) ~acc; \ 171 } else { \ 172 acc = (acc >> 16) + (acc & 0xffff); \ 173 acc += acc >> 16; \ 174 cksum = (u_short) acc; \ 175 } \ 176 } while (0) 177 178 179/* Prototypes */ 180 181/* General utilities */ 182u_short IpChecksum(struct ip *_pip); 183u_short TcpChecksum(struct ip *_pip); 184void 185DifferentialChecksum(u_short * _cksum, void * _new, void * _old, int _n); 186 187/* Internal data access */ 188struct alias_link * 189FindIcmpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 190 u_short _id_alias, int _create); 191struct alias_link * 192FindIcmpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 193 u_short _id, int _create); 194struct alias_link * 195FindFragmentIn1(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 196 u_short _ip_id); 197struct alias_link * 198FindFragmentIn2(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 199 u_short _ip_id); 200struct alias_link * 201 AddFragmentPtrLink(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id); 202struct alias_link * 203 FindFragmentPtr(struct libalias *la, struct in_addr _dst_addr, u_short _ip_id); 204struct alias_link * 205FindProtoIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 206 u_char _proto); 207struct alias_link * 208FindProtoOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 209 u_char _proto); 210struct alias_link * 211FindUdpTcpIn(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 212 u_short _dst_port, u_short _alias_port, u_char _proto, int _create); 213struct alias_link * 214FindUdpTcpOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 215 u_short _src_port, u_short _dst_port, u_char _proto, int _create); 216struct alias_link * 217AddPptp(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 218 struct in_addr _alias_addr, u_int16_t _src_call_id); 219struct alias_link * 220FindPptpOutByCallId(struct libalias *la, struct in_addr _src_addr, 221 struct in_addr _dst_addr, u_int16_t _src_call_id); 222struct alias_link * 223FindPptpInByCallId(struct libalias *la, struct in_addr _dst_addr, 224 struct in_addr _alias_addr, u_int16_t _dst_call_id); 225struct alias_link * 226FindPptpOutByPeerCallId(struct libalias *la, struct in_addr _src_addr, 227 struct in_addr _dst_addr, u_int16_t _dst_call_id); 228struct alias_link * 229FindPptpInByPeerCallId(struct libalias *la, struct in_addr _dst_addr, 230 struct in_addr _alias_addr, u_int16_t _alias_call_id); 231struct alias_link * 232FindRtspOut(struct libalias *la, struct in_addr _src_addr, struct in_addr _dst_addr, 233 u_short _src_port, u_short _alias_port, u_char _proto); 234struct in_addr 235 FindOriginalAddress(struct libalias *la, struct in_addr _alias_addr); 236struct in_addr 237 FindAliasAddress(struct libalias *la, struct in_addr _original_addr); 238 239/* External data access/modification */ 240int 241FindNewPortGroup(struct libalias *la, struct in_addr _dst_addr, struct in_addr _alias_addr, 242 u_short _src_port, u_short _dst_port, u_short _port_count, 243 u_char _proto, u_char _align); 244void GetFragmentAddr(struct alias_link *_lnk, struct in_addr *_src_addr); 245void SetFragmentAddr(struct alias_link *_lnk, struct in_addr _src_addr); 246void GetFragmentPtr(struct alias_link *_lnk, char **_fptr); 247void SetFragmentPtr(struct alias_link *_lnk, char *fptr); 248void SetStateIn(struct alias_link *_lnk, int _state); 249void SetStateOut(struct alias_link *_lnk, int _state); 250int GetStateIn (struct alias_link *_lnk); 251int GetStateOut(struct alias_link *_lnk); 252struct in_addr 253 GetOriginalAddress(struct alias_link *_lnk); 254struct in_addr 255 GetDestAddress(struct alias_link *_lnk); 256struct in_addr 257 GetAliasAddress(struct alias_link *_lnk); 258struct in_addr 259 GetDefaultAliasAddress(struct libalias *la); 260void SetDefaultAliasAddress(struct libalias *la, struct in_addr _alias_addr); 261u_short GetOriginalPort(struct alias_link *_lnk); 262u_short GetAliasPort(struct alias_link *_lnk); 263struct in_addr 264 GetProxyAddress(struct alias_link *_lnk); 265void SetProxyAddress(struct alias_link *_lnk, struct in_addr _addr); 266u_short GetProxyPort(struct alias_link *_lnk); 267void SetProxyPort(struct alias_link *_lnk, u_short _port); 268void SetAckModified(struct alias_link *_lnk); 269int GetAckModified(struct alias_link *_lnk); 270int GetDeltaAckIn(struct ip *_pip, struct alias_link *_lnk); 271int GetDeltaSeqOut(struct ip *_pip, struct alias_link *_lnk); 272void AddSeq (struct ip *_pip, struct alias_link *_lnk, int _delta); 273void SetExpire (struct alias_link *_lnk, int _expire); 274void ClearCheckNewLink(struct libalias *la); 275void SetProtocolFlags(struct alias_link *_lnk, int _pflags); 276int GetProtocolFlags(struct alias_link *_lnk); 277void SetDestCallId(struct alias_link *_lnk, u_int16_t _cid); 278 279#ifndef NO_FW_PUNCH 280void PunchFWHole(struct alias_link *_lnk); 281 282#endif 283 284/* Housekeeping function */ 285void HouseKeeping(struct libalias *); 286 287/* Tcp specfic routines */ 288/* lint -save -library Suppress flexelint warnings */ 289 290/* FTP routines */ 291void 292AliasHandleFtpOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 293 int _maxpacketsize); 294 295/* IRC routines */ 296void 297AliasHandleIrcOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 298 int _maxsize); 299 300/* RTSP routines */ 301void 302AliasHandleRtspOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 303 int _maxpacketsize); 304 305/* PPTP routines */ 306void AliasHandlePptpOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); 307void AliasHandlePptpIn(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); 308int AliasHandlePptpGreOut(struct libalias *la, struct ip *_pip); 309int AliasHandlePptpGreIn(struct libalias *la, struct ip *_pip); 310 311/* NetBIOS routines */ 312int 313AliasHandleUdpNbt(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 314 struct in_addr *_alias_address, u_short _alias_port); 315int 316AliasHandleUdpNbtNS(struct libalias *la, struct ip *_pip, struct alias_link *_lnk, 317 struct in_addr *_alias_address, u_short * _alias_port, 318 struct in_addr *_original_address, u_short * _original_port); 319 320/* CUSeeMe routines */ 321void AliasHandleCUSeeMeOut(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); 322void AliasHandleCUSeeMeIn(struct libalias *la, struct ip *_pip, struct in_addr _original_addr); 323 324/* Skinny routines */ 325void AliasHandleSkinny(struct libalias *la, struct ip *_pip, struct alias_link *_lnk); 326 327/* Transparent proxy routines */ 328int 329ProxyCheck(struct libalias *la, struct ip *_pip, struct in_addr *_proxy_server_addr, 330 u_short * _proxy_server_port); 331void 332ProxyModify(struct libalias *la, struct alias_link *_lnk, struct ip *_pip, 333 int _maxpacketsize, int _proxy_type); 334 335enum alias_tcp_state { 336 ALIAS_TCP_STATE_NOT_CONNECTED, 337 ALIAS_TCP_STATE_CONNECTED, 338 ALIAS_TCP_STATE_DISCONNECTED 339}; 340 341#if defined(_NETINET_IP_H_) 342static __inline void * 343ip_next(struct ip *iphdr) 344{ 345 char *p = (char *)iphdr; 346 return (&p[iphdr->ip_hl * 4]); 347} 348#endif 349 350#if defined(_NETINET_TCP_H_) 351static __inline void * 352tcp_next(struct tcphdr *tcphdr) 353{ 354 char *p = (char *)tcphdr; 355 return (&p[tcphdr->th_off * 4]); 356} 357#endif 358 359#if defined(_NETINET_UDP_H_) 360static __inline void * 361udp_next(struct udphdr *udphdr) 362{ 363 return ((void *)(udphdr + 1)); 364} 365#endif 366 367/*lint -restore */ 368 369#endif /* !_ALIAS_LOCAL_H_ */ 370