net.h

#ifndef NET_H
#define NET_H

#include <stdint.h>
#include <unistd.h>

#define NETDEV_TYPE_ETHERNET (0x0001)

#define NETDEV_FLAG_BROADCAST (0x0001)
#define NETDEV_FLAG_MULTICAST (0x0002)
#define NETDEV_FLAG_P2P (0x0004)
#define NETDEV_FLAG_LOOPBACK (0x0008)
#define NETDEV_FLAG_NOARP (0x0010)
#define NETDEV_FLAG_PROMISC (0x0020)
#define NETDEV_FLAG_RUNNING (0x0040)
#define NETDEV_FLAG_UP (0x0080)

#include "ethernet.h"
#define NETDEV_PROTO_IP ETHERNET_TYPE_IP
#define NETDEV_PROTO_ARP ETHERNET_TYPE_ARP
#define NETDEV_PROTO_IPV6 ETHERNET_TYPE_IPV6

#define NETIF_FAMILY_IPV4 (0x02)

#ifndef IFNAMSIZ
#define IFNAMSIZ (16)
#endif

struct netdev;

struct netif {
  struct netif *next;
  uint8_t family;
  struct netdev *dev;
  // Depends on implementation of protocols.
};

struct netdev_ops {
  int (*open)(struct netdev *dev, int opt);
  int (*close)(struct netdev *dev);
  int (*run)(struct netdev *dev);
  int (*stop)(struct netdev *dev);
  ssize_t (*tx)(struct netdev *dev, uint16_t type, uint8_t *packet, size_t size,
                const void *dst);
};

struct netdev_def {
  uint16_t type;
  uint16_t mtu;
  uint16_t flags;
  uint16_t hlen;
  uint16_t alen;
  struct netdev_ops *ops;
};

struct netdev {
  struct netdev *next;
  struct netif *ifs;
  char name[IFNAMSIZ];
  uint16_t type;
  uint16_t mtu;
  uint16_t flags;
  uint16_t hlen;
  uint16_t alen;
  uint8_t addr[16];
  uint8_t peer[16];
  uint8_t broadcast[16];
  void (*rx_handler)(struct netdev *dev, uint16_t type, uint8_t *packet,
                     size_t plen);
  struct netdev_ops *ops;
  void *priv;
};

int netdev_driver_register(struct netdev_def *def);
int netdev_proto_register(unsigned short type,
                          void (*handler)(uint8_t *packet, size_t plen,
                                          struct netdev *dev));

struct netdev *netdev_root(void);
struct netdev *netdev_alloc(uint16_t type);
int netdev_add_netif(struct netdev *dev, struct netif *netif);
struct netif *netdev_get_netif(struct netdev *dev, int family);

#endif