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Kernel+ifconfig: Add an MTU value to NetworkAdapter

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This defaults to 1500 for all adapters, but LoopbackAdapter increases
it to 65536 on construction.

If an IPv4 packet is larger than the MTU, we'll need to break it into
smaller fragments before transmitting it. This part is a FIXME. :^)
This commit is contained in:
Andreas Kling 2019-11-28 07:12:05 +01:00
parent 70fadbad37
commit 75ed262fe5
5 changed files with 18 additions and 4 deletions
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14
Kernel/Net/NetworkAdapter.cpp
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@ -70,8 +70,14 @@ void NetworkAdapter::send(const MACAddress& destination, const ARPPacket& packet
void NetworkAdapter::send_ipv4(const MACAddress& destination_mac, const IPv4Address& destination_ipv4, IPv4Protocol protocol, const u8* payload, size_t payload_size, u8 ttl)
{
size_t size_in_bytes = sizeof(EthernetFrameHeader) + sizeof(IPv4Packet) + payload_size;
auto buffer = ByteBuffer::create_zeroed(size_in_bytes);
size_t ipv4_packet_size = sizeof(IPv4Packet) + payload_size;
if (ipv4_packet_size > mtu()) {
// FIXME: Implement IP fragmentation.
ASSERT_NOT_REACHED();
}
size_t ethernet_frame_size = sizeof(EthernetFrameHeader) + sizeof(IPv4Packet) + payload_size;
auto buffer = ByteBuffer::create_zeroed(ethernet_frame_size);
auto& eth = *(EthernetFrameHeader*)buffer.data();
eth.set_source(mac_address());
eth.set_destination(destination_mac);
@ -87,9 +93,9 @@ void NetworkAdapter::send_ipv4(const MACAddress& destination_mac, const IPv4Addr
ipv4.set_ttl(ttl);
ipv4.set_checksum(ipv4.compute_checksum());
m_packets_out++;
m_bytes_out += size_in_bytes;
m_bytes_out += ethernet_frame_size;
memcpy(ipv4.payload(), payload, payload_size);
send_raw((const u8*)&eth, size_in_bytes);
send_raw((const u8*)&eth, ethernet_frame_size);
}
void NetworkAdapter::did_receive(const u8* data, int length)