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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Heap/kmalloc.h>
#include <Kernel/Interrupts/InterruptDisabler.h>
#include <Kernel/Library/StdLib.h>
#include <Kernel/Net/EtherType.h>
#include <Kernel/Net/NetworkAdapter.h>
#include <Kernel/Net/NetworkingManagement.h>
#include <Kernel/Tasks/Process.h>
namespace Kernel {
NetworkAdapter::NetworkAdapter(NonnullOwnPtr<KString> interface_name)
: m_name(move(interface_name))
{
}
NetworkAdapter::~NetworkAdapter() = default;
void NetworkAdapter::send_packet(ReadonlyBytes packet)
{
m_packets_out++;
m_bytes_out += packet.size();
send_raw(packet);
}
void NetworkAdapter::send(MACAddress const& destination, ARPPacket const& packet)
{
size_t size_in_bytes = sizeof(EthernetFrameHeader) + sizeof(ARPPacket);
auto buffer_result = NetworkByteBuffer::create_zeroed(size_in_bytes);
if (buffer_result.is_error()) {
dbgln("Dropping ARP packet targeted at {} as there is not enough memory to buffer it", packet.target_hardware_address().to_string());
return;
}
auto* eth = (EthernetFrameHeader*)buffer_result.value().data();
eth->set_source(mac_address());
eth->set_destination(destination);
eth->set_ether_type(EtherType::ARP);
memcpy(eth->payload(), &packet, sizeof(ARPPacket));
send_packet({ (u8 const*)eth, size_in_bytes });
}
void NetworkAdapter::fill_in_ipv4_header(PacketWithTimestamp& packet, IPv4Address const& source_ipv4, MACAddress const& destination_mac, IPv4Address const& destination_ipv4, IPv4Protocol protocol, size_t payload_size, u8 type_of_service, u8 ttl)
{
size_t ipv4_packet_size = sizeof(IPv4Packet) + payload_size;
VERIFY(ipv4_packet_size <= mtu());
size_t ethernet_frame_size = ipv4_payload_offset() + payload_size;
VERIFY(packet.buffer->size() == ethernet_frame_size);
memset(packet.buffer->data(), 0, ipv4_payload_offset());
auto& eth = *(EthernetFrameHeader*)packet.buffer->data();
eth.set_source(mac_address());
eth.set_destination(destination_mac);
eth.set_ether_type(EtherType::IPv4);
auto& ipv4 = *(IPv4Packet*)eth.payload();
ipv4.set_version(4);
ipv4.set_internet_header_length(5);
ipv4.set_dscp_and_ecn(type_of_service);
ipv4.set_source(source_ipv4);
ipv4.set_destination(destination_ipv4);
ipv4.set_protocol((u8)protocol);
ipv4.set_length(ipv4_packet_size);
ipv4.set_ident(1);
ipv4.set_ttl(ttl);
ipv4.set_checksum(ipv4.compute_checksum());
}
void NetworkAdapter::did_receive(ReadonlyBytes payload)
{
InterruptDisabler disabler;
m_packets_in++;
m_bytes_in += payload.size();
if (m_packet_queue_size == max_packet_buffers) {
// FIXME: Keep track of the number of dropped packets
return;
}
auto packet = acquire_packet_buffer(payload.size());
if (!packet) {
dbgln("Discarding packet because we're out of memory");
return;
}
memcpy(packet->buffer->data(), payload.data(), payload.size());
m_packet_queue.append(*packet);
m_packet_queue_size++;
if (on_receive)
on_receive();
}
size_t NetworkAdapter::dequeue_packet(u8* buffer, size_t buffer_size, UnixDateTime& packet_timestamp)
{
InterruptDisabler disabler;
if (m_packet_queue.is_empty())
return 0;
auto packet_with_timestamp = m_packet_queue.take_first();
m_packet_queue_size--;
packet_timestamp = packet_with_timestamp->timestamp;
auto& packet_buffer = packet_with_timestamp->buffer;
size_t packet_size = packet_buffer->size();
VERIFY(packet_size <= buffer_size);
memcpy(buffer, packet_buffer->data(), packet_size);
release_packet_buffer(*packet_with_timestamp);
return packet_size;
}
RefPtr<PacketWithTimestamp> NetworkAdapter::acquire_packet_buffer(size_t size)
{
auto packet = m_unused_packets.with([size](auto& unused_packets) -> RefPtr<PacketWithTimestamp> {
if (unused_packets.is_empty())
return nullptr;
auto unused_packet = unused_packets.take_first();
if (unused_packet->buffer->capacity() >= size)
return unused_packet;
unused_packets.append(*unused_packet);
return nullptr;
});
if (packet) {
packet->timestamp = kgettimeofday();
packet->buffer->set_size(size);
return packet;
}
auto buffer_or_error = KBuffer::try_create_with_size("NetworkAdapter: Packet buffer"sv, size, Memory::Region::Access::ReadWrite, AllocationStrategy::AllocateNow);
if (buffer_or_error.is_error())
return {};
packet = adopt_ref_if_nonnull(new (nothrow) PacketWithTimestamp { buffer_or_error.release_value(), kgettimeofday() });
if (!packet)
return {};
packet->buffer->set_size(size);
return packet;
}
void NetworkAdapter::release_packet_buffer(PacketWithTimestamp& packet)
{
m_unused_packets.with([&packet](auto& unused_packets) {
unused_packets.append(packet);
});
}
void NetworkAdapter::set_ipv4_address(IPv4Address const& address)
{
m_ipv4_address = address;
}
void NetworkAdapter::set_ipv4_netmask(IPv4Address const& netmask)
{
m_ipv4_netmask = netmask;
}
}
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