net.h

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/* net.h */

#define NETSTK      8192        /* Stack size for network setup */
#define NETPRIO     500         /* Network startup priority     */
#define NETBOOTFILE 128     /* Size of the netboot filename */

/* Constants used in the networking code */

#define ETH_ARP     0x0806      /* Ethernet type for ARP    */
#define ETH_IP      0x0800      /* Ethernet type for IP     */
#define ETH_IPv6    0x86DD      /* Ethernet type for IPv6   */

/* Format of an Ethernet packet carrying IPv4 and UDP */

#pragma pack(2)
struct  netpacket   {
    byte    net_ethdst[ETH_ADDR_LEN];/* Ethernet dest. MAC address  */
    byte    net_ethsrc[ETH_ADDR_LEN];/* Ethernet source MAC address */
    uint16  net_ethtype;        /* Ethernet type field      */
    byte    net_ipvh;       /* IP version and hdr length    */
    byte    net_iptos;      /* IP type of service       */
    uint16  net_iplen;      /* IP total packet length   */
    uint16  net_ipid;       /* IP datagram ID       */
    uint16  net_ipfrag;     /* IP flags & fragment offset   */
    byte    net_ipttl;      /* IP time-to-live      */
    byte    net_ipproto;        /* IP protocol (actually type)  */
    uint16  net_ipcksum;        /* IP checksum          */
    uint32  net_ipsrc;      /* IP source address        */
    uint32  net_ipdst;      /* IP destination address   */
    union {
     struct {
      uint16    net_udpsport;   /* UDP source protocol port */
      uint16    net_udpdport;   /* UDP destination protocol port*/
      uint16    net_udplen; /* UDP total length     */
      uint16    net_udpcksum;   /* UDP checksum         */
      byte      net_udpdata[1500-28];/* UDP payload (1500-above)*/
     };
     struct {
      byte      net_ictype; /* ICMP message type        */
      byte      net_iccode; /* ICMP code field (0 for ping) */
      uint16    net_iccksum;    /* ICMP message checksum    */
      uint16    net_icident;    /* ICMP identifier      */
      uint16    net_icseq;  /* ICMP sequence number     */
      byte      net_icdata[1500-28];/* ICMP payload (1500-above)*/
     };
    };
};
#pragma pack()

#define PACKLEN sizeof(struct netpacket)

extern  bpid32  netbufpool;     /* ID of net packet buffer pool */

struct  network {           /* Network information      */
    uint32  ipucast;        /* Computer's IP unicast address*/
    uint32  ipbcast;        /* IP broadcast address     */
    uint32  ipmask;         /* IP address mask      */
    uint32  ipprefix;       /* IP (network) prefix      */
    uint32  iprouter;       /* Default router address   */
    uint32  bootserver;     /* Boot server address      */
    uint32  dnsserver;      /* DNS server address       */
    uint32  ntpserver;      /* NTP (time) server address    */
    bool8   ipvalid;        /* nonzero => above are valid   */
    byte    ethucast[ETH_ADDR_LEN]; /* Ethernet multicast address   */
    byte    ethbcast[ETH_ADDR_LEN]; /* Ethernet broadcast address   */
    char    bootfile[NETBOOTFILE];  /* Name of boot file        */
};

extern  struct  network NetData;    /* Local Network Interface info */