limen/include/net.h

#pragma once
#include <cstdint>
#include <span>
#include "eth.h"
#include "ipv4.h"
#include "span_writer.h"
#include "callback_list.h"

namespace net {

struct state {
    eth::mac_addr mac;
    ipv4::ip4_addr ip;
};

using frame_callback = bool (*)(std::span<const uint8_t> frame);

using frame_cb_list = callback_list<frame_callback, 16>;
using frame_cb_handle = frame_cb_list::node*;

using ethertype_handler = void (*)(std::span<const uint8_t> frame, span_writer& tx);
using mac_filter = bool (*)(const eth::mac_addr& dst);

bool init();
const state& get_state();
frame_cb_handle add_frame_callback(frame_callback cb);
void remove_frame_callback(frame_cb_handle h);
void poll(std::span<uint8_t> tx);
void send_raw(std::span<const uint8_t> data);
void register_ethertype(uint16_t ethertype_be, ethertype_handler fn);
void register_mac_filter(mac_filter fn);

} // namespace net