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Annotation of embedaddon/dhcdrop/src/net.h, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * net.h
                      3:  *
                      4:  *  Created on: 05.08.2009
                      5:  *      Author: Chebotarev Roman
                      6:  */
                      7: 
                      8: #ifndef NET_H_
                      9: #define NET_H_
                     10: 
                     11: #pragma pack(1)
                     12: 
                     13: #define ETH_ALEN       6               /* Octets in one ethernet addr   */
                     14: 
                     15: #define        ETHERTYPE_IP            0x0800          /* IP */
                     16: #define        ETHERTYPE_ARP           0x0806          /* Address resolution */
                     17: 
                     18: /* 10Mb/s ethernet header */
                     19: struct eth_header
                     20: {
                     21:   u_int8_t  ether_dhost[ETH_ALEN];     /* destination eth addr */
                     22:   u_int8_t  ether_shost[ETH_ALEN];     /* source ether addr    */
                     23:   u_int16_t ether_type;                        /* packet type ID field */
                     24: } __attribute__ ((__packed__));
                     25: 
                     26: /*
                     27:  * Structure of an internet header, naked of options.
                     28:  */
                     29: struct iphdr
                     30: {
                     31: #if __BYTE_ORDER == __LITTLE_ENDIAN
                     32:     unsigned int ihl:4;
                     33:     unsigned int version:4;
                     34: #elif __BYTE_ORDER == __BIG_ENDIAN
                     35:     unsigned int version:4;
                     36:     unsigned int ihl:4;
                     37: #else
                     38: # error "Please fix <bits/endian.h>"
                     39: #endif
                     40:     uint8_t tos;
                     41:     uint16_t tot_len;
                     42:     uint16_t id;
                     43:     uint16_t frag_off;
                     44:     uint8_t ttl;
                     45:     uint8_t protocol;
                     46:     uint16_t check;
                     47:     uint32_t saddr;
                     48:     uint32_t daddr;
                     49:     /*The options start here. */
                     50: };
                     51: 
                     52: /* ARP header */
                     53: struct arp_header
                     54: {
                     55:     uint16_t   arp_hwtype;   /* Format of hardware address */
                     56:     uint16_t   arp_proto;   /* Format of protocol address */
                     57:     uint8_t            arp_hwlen;     /* Length of hardware address */
                     58:     uint8_t    arp_palen;     /* Length of protocol address */
                     59:     uint16_t   arp_oper;      /* ARP opcode (command) */
                     60: };
                     61: 
                     62: /* UDP header as specified by RFC 768, August 1980. */
                     63: 
                     64: struct pseudo_header
                     65: {
                     66:     unsigned int src_addr;
                     67:     unsigned int dst_addr;
                     68:     unsigned char zero ;
                     69:     unsigned char proto;
                     70:     unsigned short length;
                     71: };
                     72: 
                     73: struct udphdr
                     74: {
                     75:        uint16_t source;
                     76:        uint16_t dest;
                     77:        uint16_t len;
                     78:        uint16_t check;
                     79: };
                     80: 
                     81: struct arp_packet_net_header
                     82: {
                     83:        struct eth_header eth_head;
                     84:        struct arp_header arp_head;
                     85: };
                     86: 
                     87: struct arp_data
                     88: {
                     89:        uint8_t         from_ether[ETH_ALEN];
                     90:        uint32_t        from_ip;
                     91:        uint8_t         to_ether[ETH_ALEN];
                     92:        uint32_t        to_ip;
                     93: };
                     94: 
                     95: struct dhcp_packet_net_header
                     96: {
                     97:     struct eth_header eth_head;
                     98:     struct iphdr ip_header;
                     99:     struct udphdr udp_header;
                    100: };
                    101: 
                    102: #endif /* NET_H_ */