ecnprobe/inet.h

   1 /*
   2  Copyright (c) 2000
   3  International Computer Science Institute
   4  All rights reserved.
   5
   6  This file may contain software code originally developed for the
   7  Sting project. The Sting software carries the following copyright:
   8
   9  Copyright (c) 1998, 1999
  10  Stefan Savage and the University of Washington.
  11  All rights reserved.
  12
  13  Redistribution and use in source and binary forms, with or without
  14  modification, are permitted provided that the following conditions
  15  are met:
  16  1. Redistributions of source code must retain the above copyright
  17     notice, this list of conditions and the following disclaimer.
  18  2. Redistributions in binary form must reproduce the above copyright
  19     notice, this list of conditions and the following disclaimer in the
  20     documentation and/or other materials provided with the distribution.
  21  3. All advertising materials mentioning features or use of this software
  22     must display the following acknowledgment:
  23       This product includes software developed by ACIRI, the AT&T
  24       Center for Internet Research at ICSI (the International Computer
  25       Science Institute). This product may also include software developed
  26       by Stefan Savage at the University of Washington.
  27  4. The names of ACIRI, ICSI, Stefan Savage and University of Washington
  28     may not be used to endorse or promote products derived from this software
  29     without specific prior written permission.
  30
  31  THIS SOFTWARE IS PROVIDED BY ICSI AND CONTRIBUTORS ``AS IS'' AND
  32  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  33  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  34  ARE DISCLAIMED.  IN NO EVENT SHALL ICSI OR CONTRIBUTORS BE LIABLE
  35  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  39  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  40  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  41  SUCH DAMAGE.
  42 */
  43
  44 #ifndef _INET_H_
  45 #define _INET_H_
  46
  47 /* XXX These are machine/compiler dependent */
  48 typedef unsigned char uint8;
  49 typedef unsigned short uint16;
  50 typedef unsigned int uint32;
  51
  52 #define IPPROTOCOL_ICMP         1
  53 #define IPPROTOCOL_IGMP         2
  54 #define IPPROTOCOL_TCP          6
  55 #define IPPROTOCOL_UDP          17
  56 #define IP_DF 0x4000
  57
  58 /* TCP Flags */
  59 #define TCPFLAGS_FIN    0x01
  60 #define TCPFLAGS_SYN    0x02
  61 #define TCPFLAGS_RST    0x04
  62 #define TCPFLAGS_PSH    0x08
  63 #define TCPFLAGS_ACK    0x10
  64 #define TCPFLAGS_URG    0x20
  65 #define TCPFLAGS_ECN_ECHO       0x40
  66 #define TCPFLAGS_CWR    0x80
  67
  68 /* IP Options Parameters -- for IP Options te*/
  69 #define IPOPT_EOL            0x0
  70 #define IPOLEN_EOL           0x1
  71 #define IPOPT_NOP            0x1
  72 #define IPOLEN_NOP           0x1
  73 #define IPOPT_RR             0x7
  74 #define IPOLEN_RR           0x27 /* Maximum length; up to 9 IP addresses */
  75 #define IPOPT_TS            0x44
  76 #define IPOLEN_TS           0x28
  77 #define IPOPT_FAKED         0xff
  78 #define IPOLEN_FAKED         0x4
  79
  80 /* TCP Options Parameters */
  81 #define TCPOPT_EOL             0
  82 #define TCPOLEN_EOL            1
  83 #define TCPOPT_NOP             1
  84 #define TCPOLEN_NOP            1
  85 #define TCPOPT_MAXSEG          2
  86 #define TCPOLEN_MAXSEG         4
  87 #define TCPOPT_WINDOW          3
  88 #define TCPOLEN_WINDOW         3
  89 #define TCPOPT_SACK_PERMITTED  4
  90 #define TCPOLEN_SACK_PERMITTED 2
  91 #define TCPOPT_SACK            5
  92 #define TCPOPT_TIMESTAMP       8
  93 #define TCPOLEN_TIMESTAMP     10
  94 #define TCPOPT_FAKED        0x19
  95 #define TCPOLEN_FAKED        0x4
  96
  97 struct IpHeader {
  98   uint8         ip_vhl;  /* version (4bits) & header length (4 bits) */
  99   uint8         ip_tos;  /* type of service */
 100   uint16        ip_len;  /* length of IP datagram */
 101   uint16        ip_id;   /* identification (for frags) */
 102   uint16        ip_off;  /* offset (within a fragment) and flags (3 bits) */
 103   uint8         ip_ttl;  /* time to live */
 104   uint8         ip_p;    /* protocol number */
 105   uint16        ip_xsum; /* checksum */
 106   uint32        ip_src;  /* source address */
 107   uint32        ip_dst;  /* destination address */
 108 };
 109
 110 /* Pseudo header for doing TCP checksum calculation */
 111 struct PseudoIpHeader {
 112   uint32        filler[2];
 113   uint8         zero;
 114   uint8         ip_p;
 115   uint16        ip_len;
 116   uint32        ip_src;
 117   uint32        ip_dst;
 118 };
 119
 120 struct TcpHeader {
 121   uint16        tcp_sport;      /* source port */
 122   uint16        tcp_dport;      /* destination port */
 123   uint32        tcp_seq;        /* sequence number */
 124   uint32        tcp_ack;        /* acknoledgement number */
 125   uint8         tcp_hl;         /* header length (4 bits) */
 126   uint8         tcp_flags;      /* flags */
 127   uint16        tcp_win;        /* advertized window size */
 128   uint16        tcp_xsum;       /* checksum */
 129   uint16        tcp_urp;        /* urgent pointer */
 130 };
 131
 132
 133
 134 struct IcmpHeader {
 135   uint8         icmp_type;      /* ICMP message type */
 136   uint8         icmp_code;      /* Message code */
 137   uint16        icmp_xsum;      /* checksum */
 138   uint16        icmp_unused;    /* unused field */
 139   uint16        icmp_mtu;       /* MTU of limiting interface */
 140 };
 141
 142 struct IPPacket {
 143   struct IpHeader *ip;
 144   struct TcpHeader *tcp;
 145 };
 146
 147 struct ICMPUnreachableErrorPacket {
 148   struct IpHeader ip;
 149   struct IcmpHeader icmp;
 150   struct IpHeader off_ip;
 151   /* 8-first bytes of TCP header */
 152   uint16 tcp_sport;
 153   uint16 tcp_dport;
 154   uint32 tcp_seqno;
 155 };
 156
 157 char *InetAddress(uint32 addr);
 158
 159 uint16 InetChecksum(uint16 *ip_addr, uint16 *tcp_addr,  uint16 ip_len, uint16 tcp_len);
 160
 161 void PrintTcpPacket(struct IPPacket *p);
 162 void PrintICMPUnreachableErrorPacket(struct ICMPUnreachableErrorPacket *p);
 163
 164 void WriteIPPacket(struct IPPacket *p,
 165                    uint32 src,
 166                    uint32 dst,
 167                    uint16 sport,
 168                    uint16 dport,
 169                    uint32 seq,
 170                    uint32 ack,
 171                    uint8 flags,
 172                    uint16 win,
 173                    uint16 urp,
 174                    uint16 datalen,
 175                    uint16 ip_optlen,
 176                    uint16 optlen,
 177                    uint8 iptos,
 178                    uint8 u4tf);
 179
 180 void ReadIPPacket(struct IPPacket *p, uint32 *src, uint32 *dst,
 181                   uint16 *sport, uint16 *dport, uint32 *seq, uint32 *ack,
 182                   uint8 *flags, uint16 *win, uint16 *urp, uint16 *datalen,
 183                   uint16 *ip_optlen, uint16 *optlen);
 184
 185 void StorePacket (struct IPPacket *p);
 186
 187 struct IPPacket *FindHeaderBoundaries(char *p);
 188
 189 struct IPPacket *AllocateIPPacket(int ip_optlen, int tcp_optlen, int datalen, char *str);
 190
 191 void FreeIPPacket(struct IPPacket **pkt_p);
 192
 193 #endif /* _INET_H_ */