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Kernel: Add simple ARP routing layer

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This replaces the previous placeholder routing layer with a real one!
It's still very primitive, doesn't deal with things like timeouts very
well, and will probably need several more iterations to support more
normal networking things.

I haven't confirmed that this works with anything other than the QEMU
user networking layer, but I suspect that's what nearly everybody is
using at this point, so that's the important target to keep working.
This commit is contained in:
Conrad Pankoff 2019-08-28 21:58:01 +10:00 • committed by Andreas Kling
parent 626e176cab
commit 6d1418aa7a
6 changed files with 146 additions and 47 deletions
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32
Kernel/Net/TCPSocket.cpp
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@ -125,16 +125,8 @@ int TCPSocket::protocol_send(const void* data, int data_length)
void TCPSocket::send_tcp_packet(u16 flags, const void* payload, int payload_size)
{
if (!m_adapter) {
if (has_specific_local_address()) {
m_adapter = NetworkAdapter::from_ipv4_address(local_address());
} else {
m_adapter = adapter_for_route_to(peer_address());
if (m_adapter)
set_local_address(m_adapter->ipv4_address());
}
}
ASSERT(!!m_adapter);
auto routing_decision = route_to(peer_address(), local_address());
ASSERT(!!routing_decision.adapter);
auto buffer = ByteBuffer::create_zeroed(sizeof(TCPPacket) + payload_size);
auto& tcp_packet = *(TCPPacket*)(buffer.pointer());
@ -170,7 +162,7 @@ void TCPSocket::send_tcp_packet(u16 flags, const void* payload, int payload_size
tcp_packet.sequence_number(),
tcp_packet.ack_number());
#endif
m_adapter->send_ipv4(MACAddress(), peer_address(), IPv4Protocol::TCP, buffer.data(), buffer.size());
routing_decision.adapter->send_ipv4(routing_decision.next_hop, peer_address(), IPv4Protocol::TCP, buffer.data(), buffer.size());
m_packets_out++;
m_bytes_out += buffer.size();
@ -249,19 +241,11 @@ KResult TCPSocket::protocol_listen()
KResult TCPSocket::protocol_connect(FileDescription& description, ShouldBlock should_block)
{
if (!m_adapter) {
if (has_specific_local_address()) {
m_adapter = NetworkAdapter::from_ipv4_address(local_address());
if (!m_adapter)
return KResult(-EADDRNOTAVAIL);
} else {
m_adapter = adapter_for_route_to(peer_address());
if (!m_adapter)
return KResult(-EHOSTUNREACH);
set_local_address(m_adapter->ipv4_address());
}
}
auto routing_decision = route_to(peer_address(), local_address());
if (!routing_decision.adapter || routing_decision.next_hop.is_zero())
return KResult(-EHOSTUNREACH);
if (!has_specific_local_address())
set_local_address(routing_decision.adapter->ipv4_address());
allocate_local_port_if_needed();