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   1 /******************************************************************************
   2
   3 file: ltp2tcp.h
   4
   5 Author: Samuel Jero
   6
   7 Date: 12/2010
   8
   9 Description:  Header file for LTP 2 TCP Conversion
  10
  11
  12 Special Types Used:
  13         1)u_char
  14         2)u_int32_t
  15 ******************************************************************************/
  16 #ifndef _LTP2TCP_H_
  17 #define _LTP2TCP_H_
  18
  19 #include <stdlib.h>
  20 #include <stdarg.h>
  21 #include <string.h>
  22 #include <arpa/inet.h>
  23 #include <netinet/tcp.h>
  24 #include <pcap.h>
  25 #include "ltp.h"
  26 #include "encap.h"
  27
  28
  29
  30
  31 extern int debug;                       /*set to 1 to turn on debugging information, see ltp2tcp.c*/
  32 extern int MAX_SESSION;         /* max session size, see ltp2tcp.c*/
  33
  34
  35
  36
  37 /*session table*/
  38 struct session{
  39         int             max;            /*max used session*/
  40         struct tbl      *table;         /*session table */
  41         int             size;           /*session table size */
  42 };
  43
  44 /*session table structure*/
  45 struct tbl{
  46         int             num;            /*LTP session num */
  47         u_int32_t       start;          /*start sequence number*/
  48         int                     acked;          /* length of session that has been acked */
  49         int                     length;         /* length of session */
  50         int                     seq_id;         /*sequential Session id*/
  51         struct cl*      a_lst;          /*list of claims*/
  52 };
  53
  54 /*claim structure*/
  55 struct cl{
  56         struct cl*      next;           /*pointer to next claim*/
  57         int             offset;         /*offset for this data piece*/
  58         int             length;         /*length of this data peice*/
  59 };
  60
  61 /*converter state*/
  62 struct conversion_state{
  63         int                             seq_num;        /* Largest TCP sequence Number used*/
  64         int                             ack_num;        /* Largest TCP acknowledgment Number used*/
  65         int                             win;            /* Largest TCP window used*/
  66         int                             started;        /* 1 if we have found any LTP so far, 0 otherwise*/
  67         int                                     sender_id;      /* LTP sender ID for this connection*/
  68         int                                     seq_ses_id; /* Number of LTP sessions in this connection so far*/
  69         struct session          ses;            /* Session Table Structure*/
  70         void*                           en_priv;        /* Pointer for Encapsulation data*/
  71         struct encap_ops*       en_ops;         /* Pointer to encapsulation operations*/
  72         pcap_t*                         in;                     /*libpcap input file discriptor*/
  73         pcap_dumper_t*          out;            /*libpcap output file discriptor*/
  74         int                                     ses_min;        /*session filtering: low*/
  75         int                                     ses_max;        /*session filtering: high*/
  76 };
  77 struct conversion_state state;
  78
  79 #define MAX_PACKET      1600            /*Maximum size of TCP packet*/
  80 #define WIN_FACTOR      10000           /*Size of TCP window*/
  81 #define TBL_SZ          10000           /*Size of Session Table*/
  82
  83
  84
  85 /*debug printf
  86  * Levels:
  87  *      0) Always print even if debug isn't specified
  88  *  1) Errors and warnings... Don't overload the screen with too much output
  89  *  2) Notes and per-packet processing info... as verbose as needed
  90  */
  91 void dbgprintf(int level, const char *fmt, ...);
  92
  93
  94 #endif