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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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)
{
LOCKER(sockets_by_port().lock(), Lock::Mode::Shared);
for (auto it : sockets_by_port().resource())
callback(*it.value);
}
static auto s_map = AK::make_singleton<Lockable<HashMap<u16, UDPSocket*>>>();
Lockable<HashMap<u16, UDPSocket*>>& UDPSocket::sockets_by_port()
{
return *s_map;
}
SocketHandle<UDPSocket> UDPSocket::from_port(u16 port)
{
RefPtr<UDPSocket> socket;
{
LOCKER(sockets_by_port().lock(), Lock::Mode::Shared);
auto it = sockets_by_port().resource().find(port);
if (it == sockets_by_port().resource().end())
return {};
socket = (*it).value;
ASSERT(socket);
}
return { *socket };
}
UDPSocket::UDPSocket(int protocol)
: IPv4Socket(SOCK_DGRAM, protocol)
{
}
UDPSocket::~UDPSocket()
{
LOCKER(sockets_by_port().lock());
sockets_by_port().resource().remove(local_port());
}
NonnullRefPtr<UDPSocket> UDPSocket::create(int protocol)
{
return adopt(*new UDPSocket(protocol));
}
KResultOr<size_t> UDPSocket::protocol_receive(const KBuffer& packet_buffer, void* buffer, size_t buffer_size, int flags)
{
(void)flags;
auto& ipv4_packet = *(const IPv4Packet*)(packet_buffer.data());
auto& udp_packet = *static_cast<const UDPPacket*>(ipv4_packet.payload());
ASSERT(udp_packet.length() >= sizeof(UDPPacket)); // FIXME: This should be rejected earlier.
ASSERT(buffer_size >= (udp_packet.length() - sizeof(UDPPacket)));
memcpy(buffer, udp_packet.payload(), udp_packet.length() - sizeof(UDPPacket));
return udp_packet.length() - sizeof(UDPPacket);
}
KResultOr<size_t> UDPSocket::protocol_send(const void* data, size_t data_length)
{
auto routing_decision = route_to(peer_address(), local_address(), bound_interface());
if (routing_decision.is_zero())
return KResult(-EHOSTUNREACH);
auto buffer = ByteBuffer::create_zeroed(sizeof(UDPPacket) + data_length);
auto& udp_packet = *(UDPPacket*)(buffer.data());
udp_packet.set_source_port(local_port());
udp_packet.set_destination_port(peer_port());
udp_packet.set_length(sizeof(UDPPacket) + data_length);
memcpy(udp_packet.payload(), data, data_length);
klog() << "sending as udp packet from " << routing_decision.adapter->ipv4_address().to_string().characters() << ":" << local_port() << " to " << peer_address().to_string().characters() << ":" << peer_port() << "!";
routing_decision.adapter->send_ipv4(routing_decision.next_hop, peer_address(), IPv4Protocol::UDP, buffer, ttl());
return data_length;
}
KResult UDPSocket::protocol_connect(FileDescription&, ShouldBlock)
{
m_role = Role::Connected;
set_connected(true);
return KSuccess;
}
int UDPSocket::protocol_allocate_local_port()
{
static const u16 first_ephemeral_port = 32768;
static const u16 last_ephemeral_port = 60999;
static const 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;
LOCKER(sockets_by_port().lock());
for (u16 port = first_scan_port;;) {
auto it = sockets_by_port().resource().find(port);
if (it == sockets_by_port().resource().end()) {
set_local_port(port);
sockets_by_port().resource().set(port, this);
return port;
}
++port;
if (port > last_ephemeral_port)
port = first_ephemeral_port;
if (port == first_scan_port)
break;
}
return -EADDRINUSE;
}
KResult UDPSocket::protocol_bind()
{
LOCKER(sockets_by_port().lock());
if (sockets_by_port().resource().contains(local_port()))
return KResult(-EADDRINUSE);
sockets_by_port().resource().set(local_port(), this);
return KSuccess;
}
}
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