ref: b8986a889d7e3a445c0265c5cfb3b1db385db756
dir: /sys/src/boot/alphapc/ip.h/
typedef struct Udphdr Udphdr; struct Udphdr { uchar d[6]; /* Ethernet destination */ uchar s[6]; /* Ethernet source */ uchar type[2]; /* Ethernet packet type */ uchar vihl; /* Version and header length */ uchar tos; /* Type of service */ uchar length[2]; /* packet length */ uchar id[2]; /* Identification */ uchar frag[2]; /* Fragment information */ /* Udp pseudo ip really starts here */ uchar ttl; uchar udpproto; /* Protocol */ uchar udpplen[2]; /* Header plus data length */ uchar udpsrc[4]; /* Ip source */ uchar udpdst[4]; /* Ip destination */ uchar udpsport[2]; /* Source port */ uchar udpdport[2]; /* Destination port */ uchar udplen[2]; /* data length */ uchar udpcksum[2]; /* Checksum */ }; typedef struct Etherhdr Etherhdr; struct Etherhdr { uchar d[6]; uchar s[6]; uchar type[2]; /* Now we have the ip fields */ uchar vihl; /* Version and header length */ uchar tos; /* Type of service */ uchar length[2]; /* packet length */ uchar id[2]; /* Identification */ uchar frag[2]; /* Fragment information */ uchar ttl; /* Time to live */ uchar proto; /* Protocol */ uchar cksum[2]; /* Header checksum */ uchar src[4]; /* Ip source */ uchar dst[4]; /* Ip destination */ }; enum { IP_VER = 0x40, IP_HLEN = 0x05, UDP_EHSIZE = 22, UDP_PHDRSIZE = 12, UDP_HDRSIZE = 20, ETHER_HDR = 14, IP_UDPPROTO = 17, ET_IP = 0x800, Bcastip = 0xffffffff, BPportsrc = 68, BPportdst = 67, TFTPport = 69, Timeout = 5000, /* milliseconds */ Bootrequest = 1, Bootreply = 2, Tftp_READ = 1, Tftp_WRITE = 2, Tftp_DATA = 3, Tftp_ACK = 4, Tftp_ERROR = 5, Segsize = 512, TFTPSZ = Segsize+10, }; typedef struct Bootp Bootp; struct Bootp { uchar op; /* opcode */ uchar htype; /* hardware type */ uchar hlen; /* hardware address len */ uchar hops; /* hops */ uchar xid[4]; /* a random number */ uchar secs[2]; /* elapsed snce client started booting */ uchar pad[2]; uchar ciaddr[4]; /* client IP address (client tells server) */ uchar yiaddr[4]; /* client IP address (server tells client) */ uchar siaddr[4]; /* server IP address */ uchar giaddr[4]; /* gateway IP address */ uchar chaddr[16]; /* client hardware address */ char sname[64]; /* server host name (optional) */ char file[128]; /* boot file name */ char vend[128]; /* vendor-specific goo */ }; typedef struct Netaddr Netaddr; struct Netaddr { ulong ip; ushort port; char ea[Eaddrlen]; };