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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Singleton.h>
#include <Kernel/Devices/RandomDevice.h>
#include <Kernel/Net/NetworkAdapter.h>
#include <Kernel/Net/Routing.h>
#include <Kernel/Net/UDP.h>
#include <Kernel/Net/UDPSocket.h>
#include <Kernel/Process.h>
#include <Kernel/Random.h>
namespace Kernel {
void UDPSocket::for_each(Function<void(const UDPSocket&)> callback)
{
sockets_by_port().for_each_shared([&](const auto& socket) {
callback(*socket.value);
});
}
static Singleton<MutexProtected<HashMap<u16, UDPSocket*>>> s_map;
MutexProtected<HashMap<u16, UDPSocket*>>& UDPSocket::sockets_by_port()
{
return *s_map;
}
RefPtr<UDPSocket> UDPSocket::from_port(u16 port)
{
return sockets_by_port().with_shared([&](const auto& table) -> RefPtr<UDPSocket> {
auto it = table.find(port);
if (it == table.end())
return {};
return (*it).value;
});
}
UDPSocket::UDPSocket(int protocol, NonnullOwnPtr<DoubleBuffer> receive_buffer)
: IPv4Socket(SOCK_DGRAM, protocol, move(receive_buffer), {})
{
}
UDPSocket::~UDPSocket()
{
sockets_by_port().with_exclusive([&](auto& table) {
table.remove(local_port());
});
}
ErrorOr<NonnullRefPtr<UDPSocket>> UDPSocket::try_create(int protocol, NonnullOwnPtr<DoubleBuffer> receive_buffer)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) UDPSocket(protocol, move(receive_buffer)));
}
ErrorOr<size_t> UDPSocket::protocol_size(ReadonlyBytes raw_ipv4_packet)
{
auto& ipv4_packet = *(const IPv4Packet*)(raw_ipv4_packet.data());
auto& udp_packet = *static_cast<const UDPPacket*>(ipv4_packet.payload());
return udp_packet.length() - sizeof(UDPPacket);
}
ErrorOr<size_t> UDPSocket::protocol_receive(ReadonlyBytes raw_ipv4_packet, UserOrKernelBuffer& buffer, size_t buffer_size, [[maybe_unused]] int flags)
{
auto& ipv4_packet = *(const IPv4Packet*)(raw_ipv4_packet.data());
auto& udp_packet = *static_cast<const UDPPacket*>(ipv4_packet.payload());
VERIFY(udp_packet.length() >= sizeof(UDPPacket)); // FIXME: This should be rejected earlier.
size_t read_size = min(buffer_size, udp_packet.length() - sizeof(UDPPacket));
SOCKET_TRY(buffer.write(udp_packet.payload(), read_size));
return read_size;
}
ErrorOr<size_t> UDPSocket::protocol_send(const UserOrKernelBuffer& data, size_t data_length)
{
auto routing_decision = route_to(peer_address(), local_address(), bound_interface());
if (routing_decision.is_zero())
return set_so_error(EHOSTUNREACH);
auto ipv4_payload_offset = routing_decision.adapter->ipv4_payload_offset();
data_length = min(data_length, routing_decision.adapter->mtu() - ipv4_payload_offset - sizeof(UDPPacket));
const size_t udp_buffer_size = sizeof(UDPPacket) + data_length;
auto packet = routing_decision.adapter->acquire_packet_buffer(ipv4_payload_offset + udp_buffer_size);
if (!packet)
return set_so_error(ENOMEM);
memset(packet->buffer->data() + ipv4_payload_offset, 0, sizeof(UDPPacket));
auto& udp_packet = *reinterpret_cast<UDPPacket*>(packet->buffer->data() + ipv4_payload_offset);
udp_packet.set_source_port(local_port());
udp_packet.set_destination_port(peer_port());
udp_packet.set_length(udp_buffer_size);
SOCKET_TRY(data.read(udp_packet.payload(), data_length));
routing_decision.adapter->fill_in_ipv4_header(*packet, local_address(), routing_decision.next_hop,
peer_address(), IPv4Protocol::UDP, udp_buffer_size, type_of_service(), ttl());
routing_decision.adapter->send_packet(packet->bytes());
return data_length;
}
ErrorOr<void> UDPSocket::protocol_connect(OpenFileDescription&, ShouldBlock)
{
set_role(Role::Connected);
set_connected(true);
return {};
}
ErrorOr<u16> UDPSocket::protocol_allocate_local_port()
{
constexpr u16 first_ephemeral_port = 32768;
constexpr u16 last_ephemeral_port = 60999;
constexpr u16 ephemeral_port_range_size = last_ephemeral_port - first_ephemeral_port;
u16 first_scan_port = first_ephemeral_port + get_good_random<u16>() % ephemeral_port_range_size;
return sockets_by_port().with_exclusive([&](auto& table) -> ErrorOr<u16> {
for (u16 port = first_scan_port;;) {
auto it = table.find(port);
if (it == table.end()) {
set_local_port(port);
table.set(port, this);
return port;
}
++port;
if (port > last_ephemeral_port)
port = first_ephemeral_port;
if (port == first_scan_port)
break;
}
return set_so_error(EADDRINUSE);
});
}
ErrorOr<void> UDPSocket::protocol_bind()
{
return sockets_by_port().with_exclusive([&](auto& table) -> ErrorOr<void> {
if (table.contains(local_port()))
return set_so_error(EADDRINUSE);
table.set(local_port(), this);
return {};
});
}
}
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