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Kernel: Return the correct result for FIONREAD on datagram sockets

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Before this commit, we only checked the receive buffer on the socket,
which is unused on datagram streams. Now we return the actual size of
the datagram without the protocol headers, which required the protocol
to tell us what the size of the payload is.
This commit is contained in:
sin-ack 2021-09-11 19:38:05 +00:00 • committed by Ali Mohammad Pur
parent e4a1bc1542
commit 3da0c072f4
6 changed files with 26 additions and 1 deletions
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7
Kernel/Net/TCPSocket.cpp
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@ -161,6 +161,13 @@ ErrorOr<NonnullRefPtr<TCPSocket>> TCPSocket::try_create(int protocol, NonnullOwn
return adopt_nonnull_ref_or_enomem(new (nothrow) TCPSocket(protocol, move(receive_buffer), move(scratch_buffer)));
}
ErrorOr<size_t> TCPSocket::protocol_size(ReadonlyBytes raw_ipv4_packet)
{
auto& ipv4_packet = *reinterpret_cast<const IPv4Packet*>(raw_ipv4_packet.data());
auto& tcp_packet = *static_cast<const TCPPacket*>(ipv4_packet.payload());
return raw_ipv4_packet.size() - sizeof(IPv4Packet) - tcp_packet.header_size();
}
ErrorOr<size_t> TCPSocket::protocol_receive(ReadonlyBytes raw_ipv4_packet, UserOrKernelBuffer& buffer, size_t buffer_size, [[maybe_unused]] int flags)
{
auto& ipv4_packet = *reinterpret_cast<const IPv4Packet*>(raw_ipv4_packet.data());