Orion

/*
 * This file represents the core of the Kernel Networking System.  It contains
 * the outwards facing interface, as well as the internal interface for the
 * lower levels to make use of.
 */

#include <stdint.h>
#include <string.h>
#include "net.h"
#include "../mem/heap.h"

NetIF *netifs;

/* Switch the endian of integers */
static uint16_t
switch_endian16(uint16_t nb)
{
	return (nb>>8) | (nb<<8);
}
static uint32_t
switch_endian32(uint32_t nb)
{
	return ((nb>>24)&0xff)      |
	       ((nb<<8)&0xff0000)   |
	       ((nb>>8)&0xff00)     |
	       ((nb<<24)&0xff000000);
}

/* Host to Network byte order */
uint16_t
htons(uint16_t hostshort)
{
	return switch_endian16(hostshort);
}
uint32_t
htonl(uint32_t hostlong)
{
	return switch_endian32(hostlong);
}

/* Network to Host byte order */
uint16_t
ntohs(uint16_t netshort)
{
	return switch_endian16(netshort);
}
uint32_t
ntohl(uint32_t netlong)
{
	return switch_endian32(netlong);
}

/* Intialise Networking */
void
init_net(void)
{
	char ip[] = {10,0,2,2};
	memcpy(netifs->gatewayIp, ip, 4);
	arp_request(netifs, ip, netifs->gatewayMac);

	/* Send ICMP ECHO */
	char icmp[12] = {
		8, 0,
		0xF7, 0xFE,
		0x00, 0x01,
		0, 0
	};
	char pip[] = {1,1,1,1};
	ipv4_send_packet(netifs, pip, 1, 0, icmp, 12);
}

/* Register a Network Driver */
NetIF *
net_create_interface(uint16_t type, void (*transmit)(void *, size_t),
                     void (*get_mac)(char *buf))
{
	NetIF *netif = kmalloc(sizeof(NetIF));
	netif->type = type;
	netif->transmit = transmit;
	netif->get_mac = get_mac;
	netif->get_mac(netif->mac);
	netif->ip[0] = 10;
	netif->ip[1] =  0;
	netif->ip[2] =  2;
	netif->ip[3] = 15;

	/* Link into list */
	netif->next = netifs;
	netifs = netif;
}