#ifndef IP_H

#define IP_H

#include <stddef.h>

#include <stdint.h>

#include <sys/types.h>

#include "net.h"

#define IP_VERSION_IPV4 4

#define IP_HDR_SIZE_MIN 20

#define IP_HDR_SIZE_MAX 60

#define IP_TOTAL_SIZE_MAX UINT16_MAX /* maximum value of uint16 */

#define IP_PAYLOAD_SIZE_MAX (IP_TOTAL_SIZE_MAX - IP_HDR_SIZE_MIN)

#define IP_ADDR_LEN 4

#define IP_ADDR_STR_LEN 16 /* "ddd.ddd.ddd.ddd\0" */

#define IP_ENDPOINT_STR_LEN (IP_ADDR_STR_LEN + 6) /* xxx.xxx.xxx.xxx:yyyyy\n */

#define IP_PROTOCOL_ICMP 0x01

#define IP_PROTOCOL_TCP 0x06

#define IP_PROTOCOL_UDP 0x11

typedef uint32_t ip_addr_t;

struct ip_endpoint {

ip_addr_t addr;

uint16_t port;

};

struct ip_iface {

};

extern const ip_addr_t IP_ADDR_ANY;

extern const ip_addr_t IP_ADDR_BROADCAST;

extern int

ip_addr_pton(const char *p, ip_addr_t *n);

extern char *

ip_addr_ntop(const ip_addr_t n, char *p, size_t size);

extern int

ip_endpoint_pton(const char *p, struct ip_endpoint *n);

extern char *

ip_endpoint_ntop(const struct ip_endpoint *n, char *p, size_t size);

extern int

ip_route_set_default_gateway(struct ip_iface *iface, const char *gateway);

extern struct ip_iface *

ip_route_get_iface(ip_addr_t dst);

extern struct ip_iface *

ip_iface_alloc(const char *addr, const char *netmask);

extern int

ip_iface_register(struct net_device *dev, struct ip_iface *iface);

extern struct ip_iface *

ip_iface_select(ip_addr_t addr);

extern ssize_t

ip_output(uint8_t protocol, const uint8_t *data, size_t len, ip_addr_t src, ip_addr_t dst);

extern int

ip_protocol_register(const char *name, uint8_t type, void (*handler)(const uint8_t *data, size_t len, ip_addr_t src, ip_addr_t dst, struct ip_iface *iface));

extern char *

ip_protocol_name(uint8_t type);

extern int

ip_init(void);