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arp

Address Resolution Protocol

IPv4 -> MAC

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struct arp
{
    u16 htype;
    u16 ptype;
    u8  hlen;
    u8  plen;
    u16 opcode;
    u8  srchw[hlen];
    u8  srcpr[plen];
    u8  dsthw[hlen];
    u8  dstpr[plen];
};

len

对于 eth :

  • hlen = 6
  • plen = 4

opcode

  • REQUEST - 查询对方
  • REPLY - 回复查询

warning

转换为大端字节序

todo

  • arp cache