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 /* ICMP type */
  59 #define ICMP_TIMXCEED   11
  60
  61 /* TCP Flags */
  62 #define TCPFLAGS_FIN    0x01
  63 #define TCPFLAGS_SYN    0x02
  64 #define TCPFLAGS_RST    0x04
  65 #define TCPFLAGS_PSH    0x08
  66 #define TCPFLAGS_ACK    0x10
  67 #define TCPFLAGS_URG    0x20
  68 #define TCPFLAGS_ECN_ECHO       0x40
  69 #define TCPFLAGS_CWR    0x80
  70
  71 /* IP Options Parameters -- for IP Options te*/
  72 #define IPOPT_EOL            0x0
  73 #define IPOLEN_EOL           0x1
  74 #define IPOPT_NOP            0x1
  75 #define IPOLEN_NOP           0x1
  76 #define IPOPT_RR             0x7
  77 #define IPOLEN_RR           0x27 /* Maximum length; up to 9 IP addresses */
  78 #define IPOPT_TS            0x44
  79 #define IPOLEN_TS           0x28
  80 #define IPOPT_FAKED         0xff
  81 #define IPOLEN_FAKED         0x4
  82
  83 /* TCP Options Parameters */
  84 #define TCPOPT_EOL             0
  85 #define TCPOLEN_EOL            1
  86 #define TCPOPT_NOP             1
  87 #define TCPOLEN_NOP            1
  88 #define TCPOPT_MAXSEG          2
  89 #define TCPOLEN_MAXSEG         4
  90 #define TCPOPT_WINDOW          3
  91 #define TCPOLEN_WINDOW         3
  92 #define TCPOPT_SACK_PERMITTED  4
  93 #define TCPOLEN_SACK_PERMITTED 2
  94 #define TCPOPT_SACK            5
  95 #define TCPOPT_TIMESTAMP       8
  96 #define TCPOLEN_TIMESTAMP     10
  97 #define TCPOPT_FAKED        0x19
  98 #define TCPOLEN_FAKED        0x4
  99
 100 struct IpHeader {
 101   uint8         ip_vhl;  /* version (4bits) & header length (4 bits) */
 102   uint8         ip_tos;  /* type of service */
 103   uint16        ip_len;  /* length of IP datagram */
 104   uint16        ip_id;   /* identification (for frags) */
 105   uint16        ip_off;  /* offset (within a fragment) and flags (3 bits) */
 106   uint8         ip_ttl;  /* time to live */
 107   uint8         ip_p;    /* protocol number */
 108   uint16        ip_xsum; /* checksum */
 109   uint32        ip_src;  /* source address */
 110   uint32        ip_dst;  /* destination address */
 111 };
 112
 113 /* Pseudo header for doing TCP checksum calculation */
 114 struct PseudoIpHeader {
 115   uint32        filler[2];
 116   uint8         zero;
 117   uint8         ip_p;
 118   uint16        ip_len;
 119   uint32        ip_src;
 120   uint32        ip_dst;
 121 };
 122
 123 struct TcpHeader {
 124   uint16        tcp_sport;      /* source port */
 125   uint16        tcp_dport;      /* destination port */
 126   uint32        tcp_seq;        /* sequence number */
 127   uint32        tcp_ack;        /* acknoledgement number */
 128   uint8         tcp_hl;         /* header length (4 bits) */
 129   uint8         tcp_flags;      /* flags */
 130   uint16        tcp_win;        /* advertized window size */
 131   uint16        tcp_xsum;       /* checksum */
 132   uint16        tcp_urp;        /* urgent pointer */
 133 };
 134
 135
 136
 137 struct IcmpHeader {
 138   uint8         icmp_type;      /* ICMP message type */
 139   uint8         icmp_code;      /* Message code */
 140   uint16        icmp_xsum;      /* checksum */
 141   uint16        icmp_unused;    /* unused field */
 142   uint16        icmp_mtu;       /* MTU of limiting interface */
 143 };
 144
 145 struct IPPacket {
 146   struct IpHeader *ip;
 147   struct TcpHeader *tcp;
 148 };
 149
 150 struct ICMPUnreachableErrorPacket {
 151   struct IpHeader ip;
 152   struct IcmpHeader icmp;
 153   struct IpHeader off_ip;
 154   /* 8-first bytes of TCP header */
 155   uint16 tcp_sport;
 156   uint16 tcp_dport;
 157   uint32 tcp_seqno;
 158 };
 159
 160 struct ICMPTimeExceededErrorPacket {
 161   struct IpHeader ip;
 162   struct IcmpHeader icmp;
 163   struct IpHeader off_ip;
 164   /* 8-first bytes of Tcpheader */
 165   uint16 tcp_sport;
 166   uint16 tcp_dport;
 167   uint32 tcp_seqno;
 168 };
 169
 170 char *InetAddress(uint32 addr);
 171
 172 uint16 InetChecksum(uint16 *ip_addr, uint16 *tcp_addr,  uint16 ip_len, uint16 tcp_len);
 173
 174 void PrintTcpPacket(struct IPPacket *p);
 175 void PrintICMPUnreachableErrorPacket(struct ICMPUnreachableErrorPacket *p);
 176
 177 void WriteIPPacket(struct IPPacket *p,
 178                    uint32 src,
 179                    uint32 dst,
 180                    uint16 sport,
 181                    uint16 dport,
 182                    uint32 seq,
 183                    uint32 ack,
 184                    uint8 flags,
 185                    uint16 win,
 186                    uint16 urp,
 187                    uint16 datalen,
 188                    uint16 ip_optlen,
 189                    uint16 optlen,
 190                    uint8 iptos,
 191                    uint8 u4tf);
 192
 193 void ReadIPPacket(struct IPPacket *p, uint32 *src, uint32 *dst,
 194                   uint16 *sport, uint16 *dport, uint32 *seq, uint32 *ack,
 195                   uint8 *flags, uint16 *win, uint16 *urp, uint16 *datalen,
 196                   uint16 *ip_optlen, uint16 *optlen);
 197
 198 void StorePacket (struct IPPacket *p);
 199
 200 struct IPPacket *FindHeaderBoundaries(char *p);
 201
 202 struct IPPacket *AllocateIPPacket(int ip_optlen, int tcp_optlen, int datalen, char *str);
 203
 204 void FreeIPPacket(struct IPPacket **pkt_p);
 205
 206 #endif /* _INET_H_ */