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eth.h

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/*!     \file include/net/eth.h
 *      \brief Ethernet driver header.
 *      \author Andrea Righi <drizzt@inwind.it>
 *      \date Last update: 2003-11-09
 *      \note Copyright (&copy;) 2003 Andrea Righi
 */

#ifndef ETH_H
#define ETH_H

#include <kernel/semaphore.h>

//! IP packet type.
#define ETH_FRAME_IP            0x0800
//! ARP packet type.
#define ETH_FRAME_ARP           0x0806
//! Size of an ethernet address (a.k.a. MAC).
#define ETH_ADDR_LEN            6
//! Size of the ethernet header.
#define ETH_HEAD_LEN            14
//! Minimum ethernet packet size.
#define ETH_MIN_LEN             60
//! Maximum ethernet packet size.
#define ETH_FRAME_LEN           1514
//! Ethernet MTU (Maximum transfer unit).
#define ETH_MTU                 (ETH_FRAME_LEN - ETH_HEAD_LEN)

//! Send and receive buffers size.
#define ETH_RECV_BUF_DIM        10

//! Physical packet structure.
typedef struct phys_packet
{
        //! The packet size.
        size_t length;
        //! The packet content.
        uint8_t data[ETH_FRAME_LEN];
} phys_packet_t;

//! An ethernet buffer structure.
typedef struct eth_buf
{
        //! The packets pointers.
        phys_packet_t packet[ETH_RECV_BUF_DIM];
        //! The position of the next packet received.
        int     read,
        //! The position of the next packet to be sent.
                write,
        //! The amount of packets in the buffer.
                count;
        //! A mutex semaphore for the buffer.
        semaphore_t mutex;
} eth_buf_t;

/** \ingroup Network
 *  \defgroup NetEthernet Ethernet Layer
 *  The ethernet layer.
 *  @{
 */

//! An ethernet packet structure.
typedef struct ethernet
{
        //! Destination MAC address.
        uint8_t  dst[ETH_ADDR_LEN];
        //! Source MAC address.
        uint8_t  src[ETH_ADDR_LEN];
        //! The packet type.
        uint16_t type;
        //! The packet content.
        uint8_t data[1];
}  __attribute__ ((packed)) ethernet_t;

// --- Prototypes ----------------------------------------------------- //

void to_eth_layer(ethernet_t *packet, size_t len);
int send_eth_packet(const uint8_t *to, const void *data, size_t len, uint16_t type);
bool is_eth_promisc();
void ifconfig(char *cmd);

/** @} */ // end of NetEthernet

#endif

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