typedef struct Block Block;

typedef struct Block Block;
struct Block
{
Block *next;

uchar *rp;
uchar *wp;
uchar *lim;

uchar base[];
};

#define BLEN(s) ((s)->wp - (s)->rp)

Block* allocb(int size);
Block* copyblock(Block*, int);
#define freeb(b) free(b)

enum {
Eaddrlen= 6,
ETHERHDRSIZE= 14, /* size of an ethernet header */
Maxpkt= 2000,
};

typedef struct Macent Macent;
struct Macent
{
uchar ea[Eaddrlen];
ushort port;
};

typedef struct Etherpkt Etherpkt;
struct Etherpkt
{
uchar d[Eaddrlen];
uchar s[Eaddrlen];
uchar type[2];
uchar data[1500];
};

enum
{
Cdcunion = 6,
Scether = 6,
Fnether = 15,
};

int debug;
int setmac;

int nprom;
int nmulti;
uchar multiaddr[32][Eaddrlen];

/* to be filled in by *init() */
uchar macaddr[Eaddrlen];

Macent mactab[127];

void etheriq(Block*);

int (*epreceive)(Dev*);
void (*eptransmit)(Dev*, Block*);
int (*eppromiscuous)(Dev*, int);
int (*epmulticast)(Dev*, uchar*, int);