{Ethernet, IP, ICMP, UDP, TCP} headers

header.h

@@ -1,78 +1,78 @@
 // Ethernet header
 struct ethheader
 {
-	u_char ether_dhost[6]; // destination host address
-	u_char ether_shost[6]; // source host address
-	u_short ether_type;    // IP? ARP? RARP? etc
+    u_char ether_dhost[6]; // destination host address
+    u_char ether_shost[6]; // source host address
+    u_short ether_type;    // IP? ARP? RARP? etc
 };
 
 // IP Header
 struct ipheader
 {
-	unsigned char iph_ihl : 4,       // IP header length
-		iph_ver : 4;                 // IP version
-	unsigned char iph_tos;           // Type of service
-	unsigned short int iph_len;      // IP Packet length (data + header)
-	unsigned short int iph_ident;    // Identification
-	unsigned short int iph_flag : 3, // Fragmentation flags
-		iph_offset : 13;             // Flags offset
-	unsigned char iph_ttl;           // Time to Live
-	unsigned char iph_protocol;      // Protocol type
-	unsigned short int iph_chksum;   // IP datagram checksum
-	struct in_addr iph_sourceip;     // Source IP address
-	struct in_addr iph_destip;       // Destination IP address
+    unsigned char iph_ihl : 4,       // IP header length
+        iph_ver : 4;                 // IP version
+    unsigned char iph_tos;           // Type of service
+    unsigned short int iph_len;      // IP Packet length (data + header)
+    unsigned short int iph_ident;    // Identification
+    unsigned short int iph_flag : 3, // Fragmentation flags
+        iph_offset : 13;             // Flags offset
+    unsigned char iph_ttl;           // Time to Live
+    unsigned char iph_protocol;      // Protocol type
+    unsigned short int iph_chksum;   // IP datagram checksum
+    struct in_addr iph_sourceip;     // Source IP address
+    struct in_addr iph_destip;       // Destination IP address
 };
 
 // ICMP Header
 struct icmpheader
 {
-	unsigned char icmp_type;        // ICMP message type
-	unsigned char icmp_code;        // Error code
-	unsigned short int icmp_chksum; // Checksum for ICMP Header and data
-	unsigned short int icmp_id;     // Used for identifying request
-	unsigned short int icmp_seq;    // Sequence number
+    unsigned char icmp_type;        // ICMP message type
+    unsigned char icmp_code;        // Error code
+    unsigned short int icmp_chksum; // Checksum for ICMP Header and data
+    unsigned short int icmp_id;     // Used for identifying request
+    unsigned short int icmp_seq;    // Sequence number
 };
 
 // UDP Header
 struct udpheader
 {
-	u_int16_t udp_sport; // source port
-	u_int16_t udp_dport; // destination port
-	u_int16_t udp_ulen;  // udp length
-	u_int16_t udp_sum;   // udp checksum
+    u_int16_t udp_sport; // source port
+    u_int16_t udp_dport; // destination port
+    u_int16_t udp_ulen;  // udp length
+    u_int16_t udp_sum;   // udp checksum
 };
 
 // TCP Header
 struct tcpheader
 {
-	u_short tcp_sport; // source port
-	u_short tcp_dport; // destination port
-	u_int tcp_seq;	   // sequence number
-	u_int tcp_ack;	   // acknowledgement number
-	u_char tcp_offx2;  // data offset, rsvd
-	#define TH_OFF(th) (((th)->tcp_offx2 & 0xf0) >> 4)
-	u_char tcp_flags;
-	#define TH_FIN 0x01
-	#define TH_SYN 0x02
-	#define TH_RST 0x04
-	#define TH_PUSH 0x08
-	#define TH_ACK 0x10
-	#define TH_URG 0x20
-	#define TH_ECE 0x40
-	#define TH_CWR 0x80
-	#define TH_FLAGS (TH_FIN | TH_SYN | TH_RST | TH_ACK | TH_URG | TH_ECE | TH_CWR)
-	u_short tcp_win; // window
-	u_short tcp_sum; // checksum
-	u_short tcp_urp; // urgent pointer
+    u_short tcp_sport; // source port
+    u_short tcp_dport; // destination port
+    u_int tcp_seq;     // sequence number
+    u_int tcp_ack;     // acknowledgement number
+    u_char tcp_offx2;  // data offset, rsvd
+#define TH_OFF(th) (((th)->tcp_offx2 & 0xf0) >> 4)
+    u_char tcp_flags;
+#define TH_FIN 0x01
+#define TH_SYN 0x02
+#define TH_RST 0x04
+#define TH_PUSH 0x08
+#define TH_ACK 0x10
+#define TH_URG 0x20
+#define TH_ECE 0x40
+#define TH_CWR 0x80
+#define TH_FLAGS (TH_FIN | TH_SYN | TH_RST | TH_ACK | TH_URG | TH_ECE | TH_CWR)
+    u_short tcp_win; // window
+    u_short tcp_sum; // checksum
+    u_short tcp_urp; // urgent pointer
 };
 
 // Psuedo TCP header
 struct pseudo_tcp
 {
-	unsigned saddr, daddr;
-	unsigned char mbz;
-	unsigned char ptcl;
-	unsigned short tcpl;
-	struct tcpheader tcp;
-	char payload[1500];
+    unsigned saddr, daddr;
+    unsigned char mbz;
+    unsigned char ptcl;
+    unsigned short tcpl;
+    struct tcpheader tcp;
+    char payload[1500];
 };