commands/dhcpd/arp.h

   1 /*      arp.h - Address Resolution Protocol packet format.
   2  *                                                      Author: Kees J. Bot
   3  *                                                              16 Dec 2000
   4  */
   5 #ifndef ARP_H
   6 #define ARP_H
   7
   8 typedef struct arp46 {
   9         ether_addr_t    dstaddr;
  10         ether_addr_t    srcaddr;
  11         ether_type_t    ethtype;        /* ARP_PROTO. */
  12         u16_t           hdr, pro;       /* ARP_ETHERNET & ETH_IP_PROTO. */
  13         u8_t            hln, pln;       /* 6 & 4. */
  14         u16_t           op;             /* ARP_REQUEST or ARP_REPLY. */
  15         ether_addr_t    sha;            /* Source hardware address. */
  16         u8_t            spa[4];         /* Source protocol address. */
  17         ether_addr_t    tha;            /* Likewise for the target. */
  18         u8_t            tpa[4];
  19         char            padding[60 - (4*6 + 2*4 + 4*2 + 2*1)];
  20 } arp46_t;
  21
  22 #define ARP_ETHERNET    1       /* ARP on Ethernet. */
  23 #define ARP_REQUEST     1       /* A request for an IP address. */
  24 #define ARP_REPLY       2       /* A reply to a request. */
  25
  26 #endif /* ARP_H */