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Kernel: Implement basic recvfrom

This commit is contained in:
Bananymous 2024-02-02 13:50:00 +02:00
parent 7b287a1d5b
commit 0f154c3173
20 changed files with 339 additions and 116 deletions
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4
kernel/include/kernel/FS/Inode.h
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@ -102,6 +102,7 @@ namespace Kernel
// Socket API
BAN::ErrorOr<void> bind(const sockaddr* address, socklen_t address_len);
BAN::ErrorOr<ssize_t> sendto(const sys_sendto_t*);
BAN::ErrorOr<ssize_t> recvfrom(sys_recvfrom_t*);
// General API
BAN::ErrorOr<size_t> read(off_t, BAN::ByteSpan buffer);
@ -126,7 +127,8 @@ namespace Kernel
// Socket API
virtual BAN::ErrorOr<void> bind_impl(const sockaddr*, socklen_t) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<ssize_t> sendto_impl(const sys_sendto_t*) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<ssize_t> sendto_impl(const sys_sendto_t*) { return BAN::Error::from_errno(ENOTSUP); }
virtual BAN::ErrorOr<ssize_t> recvfrom_impl(sys_recvfrom_t*) { return BAN::Error::from_errno(ENOTSUP); }
// General API
virtual BAN::ErrorOr<size_t> read_impl(off_t, BAN::ByteSpan) { return BAN::Error::from_errno(ENOTSUP); }

8
kernel/include/kernel/Networking/E1000/E1000.h
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@ -23,7 +23,7 @@ namespace Kernel
static BAN::ErrorOr<BAN::RefPtr<E1000>> create(PCI::Device&);
~E1000();
virtual uint8_t* get_mac_address() override { return m_mac_address; }
virtual BAN::MACAddress get_mac_address() const override { return m_mac_address; }
virtual bool link_up() override { return m_link_up; }
virtual int link_speed() override;
@ -66,11 +66,7 @@ namespace Kernel
BAN::UniqPtr<DMARegion> m_rx_descriptor_region;
BAN::UniqPtr<DMARegion> m_tx_descriptor_region;
uint8_t m_mac_address[6] {};
uint16_t m_rx_current {};
uint16_t m_tx_current {};
void* m_rx_buffers[E1000_RX_DESCRIPTOR_COUNT] {};
void* m_tx_buffers[E1000_TX_DESCRIPTOR_COUNT] {};
BAN::MACAddress m_mac_address {};
bool m_link_up { false };
friend class BAN::RefPtr<E1000>;

30
kernel/include/kernel/Networking/IPv4.h
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@ -1,10 +1,38 @@
#pragma once
#include <BAN/ByteSpan.h>
#include <BAN/Endianness.h>
#include <BAN/IPv4.h>
#include <BAN/Vector.h>
namespace Kernel
{
BAN::ErrorOr<void> add_ipv4_header(BAN::Vector<uint8_t>&, uint32_t src_ipv4, uint32_t dst_ipv4, uint8_t protocol);
struct IPv4Header
{
uint8_t version_IHL;
uint8_t DSCP_ECN;
BAN::NetworkEndian<uint16_t> total_length { 0 };
BAN::NetworkEndian<uint16_t> identification { 0 };
BAN::NetworkEndian<uint16_t> flags_frament { 0 };
uint8_t time_to_live;
uint8_t protocol;
BAN::NetworkEndian<uint16_t> checksum { 0 };
BAN::IPv4Address src_address;
BAN::IPv4Address dst_address;
constexpr uint16_t calculate_checksum() const
{
return 0xFFFF
- (((uint16_t)version_IHL << 8) | DSCP_ECN)
- total_length
- identification
- flags_frament
- (((uint16_t)time_to_live << 8) | protocol);
}
};
static_assert(sizeof(IPv4Header) == 20);
void add_ipv4_header(BAN::ByteSpan packet, BAN::IPv4Address src_ipv4, BAN::IPv4Address dst_ipv4, uint8_t protocol);
}

11
kernel/include/kernel/Networking/NetworkInterface.h
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@ -2,7 +2,9 @@
#include <BAN/Errors.h>
#include <BAN/ByteSpan.h>
#include <BAN/MAC.h>
#include <kernel/Device/Device.h>
#include <kernel/Networking/IPv4.h>
namespace Kernel
{
@ -19,13 +21,14 @@ namespace Kernel
NetworkInterface();
virtual ~NetworkInterface() {}
virtual uint8_t* get_mac_address() = 0;
uint32_t get_ipv4_address() const { return m_ipv4_address; }
virtual BAN::MACAddress get_mac_address() const = 0;
BAN::IPv4Address get_ipv4_address() const { return m_ipv4_address; }
virtual bool link_up() = 0;
virtual int link_speed() = 0;
BAN::ErrorOr<void> add_interface_header(BAN::Vector<uint8_t>&, uint8_t destination_mac[6]);
size_t interface_header_size() const;
void add_interface_header(BAN::ByteSpan packet, BAN::MACAddress destination);
virtual dev_t rdev() const override { return m_rdev; }
virtual BAN::StringView name() const override { return m_name; }
@ -38,7 +41,7 @@ namespace Kernel
const dev_t m_rdev;
char m_name[10];
uint32_t m_ipv4_address {};
BAN::IPv4Address m_ipv4_address { 0 };
};
}

2
kernel/include/kernel/Networking/NetworkManager.h
View File

@ -32,6 +32,8 @@ namespace Kernel
BAN::ErrorOr<BAN::RefPtr<NetworkSocket>> create_socket(SocketType, mode_t, uid_t, gid_t);
void on_receive(BAN::ConstByteSpan);
private:
NetworkManager();

10
kernel/include/kernel/Networking/NetworkSocket.h
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@ -4,6 +4,8 @@
#include <kernel/FS/TmpFS/Inode.h>
#include <kernel/Networking/NetworkInterface.h>
#include <netinet/in.h>
namespace Kernel
{
@ -16,16 +18,22 @@ namespace Kernel
void bind_interface_and_port(NetworkInterface*, uint16_t port);
~NetworkSocket();
virtual BAN::ErrorOr<void> add_protocol_header(BAN::Vector<uint8_t>&, uint16_t src_port, uint16_t dst_port) = 0;
virtual size_t protocol_header_size() const = 0;
virtual void add_protocol_header(BAN::ByteSpan packet, uint16_t src_port, uint16_t dst_port) = 0;
virtual uint8_t protocol() const = 0;
virtual void add_packet(BAN::ConstByteSpan, BAN::IPv4Address sender_address, uint16_t sender_port) = 0;
protected:
NetworkSocket(mode_t mode, uid_t uid, gid_t gid);
virtual BAN::ErrorOr<size_t> read_packet(BAN::ByteSpan, sockaddr_in* sender_address) = 0;
virtual void on_close_impl() override;
virtual BAN::ErrorOr<void> bind_impl(const sockaddr* address, socklen_t address_len) override;
virtual BAN::ErrorOr<ssize_t> sendto_impl(const sys_sendto_t*) override;
virtual BAN::ErrorOr<ssize_t> recvfrom_impl(sys_recvfrom_t*) override;
protected:
NetworkInterface* m_interface = nullptr;

33
kernel/include/kernel/Networking/UDPSocket.h
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@ -1,23 +1,54 @@
#pragma once
#include <BAN/CircularQueue.h>
#include <BAN/Endianness.h>
#include <kernel/Memory/VirtualRange.h>
#include <kernel/Networking/NetworkInterface.h>
#include <kernel/Networking/NetworkSocket.h>
#include <kernel/Semaphore.h>
namespace Kernel
{
struct UDPHeader
{
BAN::NetworkEndian<uint16_t> src_port;
BAN::NetworkEndian<uint16_t> dst_port;
BAN::NetworkEndian<uint16_t> length;
BAN::NetworkEndian<uint16_t> checksum;
};
static_assert(sizeof(UDPHeader) == 8);
class UDPSocket final : public NetworkSocket
{
public:
static BAN::ErrorOr<BAN::RefPtr<UDPSocket>> create(mode_t, uid_t, gid_t);
virtual BAN::ErrorOr<void> add_protocol_header(BAN::Vector<uint8_t>&, uint16_t src_port, uint16_t dst_port) override;
virtual size_t protocol_header_size() const override { return sizeof(UDPHeader); }
virtual void add_protocol_header(BAN::ByteSpan packet, uint16_t src_port, uint16_t dst_port) override;
virtual uint8_t protocol() const override { return 0x11; }
protected:
virtual void add_packet(BAN::ConstByteSpan, BAN::IPv4Address sender_addr, uint16_t sender_port) override;
virtual BAN::ErrorOr<size_t> read_packet(BAN::ByteSpan, sockaddr_in* sender_address) override;
private:
UDPSocket(mode_t, uid_t, gid_t);
struct PacketInfo
{
BAN::IPv4Address sender_addr;
uint16_t sender_port;
size_t packet_size;
};
private:
static constexpr size_t packet_buffer_size = 10 * PAGE_SIZE;
BAN::UniqPtr<VirtualRange> m_packet_buffer;
BAN::CircularQueue<PacketInfo, 128> m_packets;
size_t m_packet_total_size { 0 };
Semaphore m_semaphore;
friend class BAN::RefPtr<UDPSocket>;
};

1
kernel/include/kernel/Process.h
View File

@ -115,6 +115,7 @@ namespace Kernel
BAN::ErrorOr<long> sys_socket(int domain, int type, int protocol);
BAN::ErrorOr<long> sys_bind(int socket, const sockaddr* address, socklen_t address_len);
BAN::ErrorOr<long> sys_sendto(const sys_sendto_t*);
BAN::ErrorOr<long> sys_recvfrom(sys_recvfrom_t*);
BAN::ErrorOr<long> sys_pipe(int fildes[2]);
BAN::ErrorOr<long> sys_dup(int fildes);

8
kernel/kernel/FS/Inode.cpp
View File

@ -132,6 +132,14 @@ namespace Kernel
return sendto_impl(arguments);
};
BAN::ErrorOr<ssize_t> Inode::recvfrom(sys_recvfrom_t* arguments)
{
LockGuard _(m_lock);
if (!mode().ifsock())
return BAN::Error::from_errno(ENOTSOCK);
return recvfrom_impl(arguments);
};
BAN::ErrorOr<size_t> Inode::read(off_t offset, BAN::ByteSpan buffer)
{
LockGuard _(m_lock);

32
kernel/kernel/Networking/E1000/E1000.cpp
View File

@ -4,6 +4,7 @@
#include <kernel/Memory/PageTable.h>
#include <kernel/MMIO.h>
#include <kernel/Networking/E1000/E1000.h>
#include <kernel/Networking/NetworkManager.h>
#define DEBUG_E1000 1
@ -69,14 +70,7 @@ namespace Kernel
TRY(read_mac_address());
#if DEBUG_E1000
dprintln("E1000 at PCI {}:{}.{}", m_pci_device.bus(), m_pci_device.dev(), m_pci_device.func());
dprintln(" MAC: {2H}:{2H}:{2H}:{2H}:{2H}:{2H}",
m_mac_address[0],
m_mac_address[1],
m_mac_address[2],
m_mac_address[3],
m_mac_address[4],
m_mac_address[5]
);
dprintln(" MAC: {}", m_mac_address);
#endif
TRY(initialize_rx());
@ -141,16 +135,16 @@ namespace Kernel
if (m_has_eerprom)
{
uint32_t temp = eeprom_read(0);
m_mac_address[0] = temp;
m_mac_address[1] = temp >> 8;
m_mac_address.address[0] = temp;
m_mac_address.address[1] = temp >> 8;
temp = eeprom_read(1);
m_mac_address[2] = temp;
m_mac_address[3] = temp >> 8;
m_mac_address.address[2] = temp;
m_mac_address.address[3] = temp >> 8;
temp = eeprom_read(2);
m_mac_address[4] = temp;
m_mac_address[5] = temp >> 8;
m_mac_address.address[4] = temp;
m_mac_address.address[5] = temp >> 8;
return {};
}
@ -162,7 +156,7 @@ namespace Kernel
}
for (int i = 0; i < 6; i++)
m_mac_address[i] = (uint8_t)read32(0x5400 + i * 8);
m_mac_address.address[i] = (uint8_t)read32(0x5400 + i * 8);
return {};
}
@ -175,7 +169,6 @@ namespace Kernel
auto* rx_descriptors = reinterpret_cast<volatile e1000_rx_desc*>(m_rx_descriptor_region->vaddr());
for (size_t i = 0; i < E1000_RX_DESCRIPTOR_COUNT; i++)
{
m_rx_buffers[i] = reinterpret_cast<void*>(m_rx_buffer_region->vaddr() + E1000_RX_BUFFER_SIZE * i);
rx_descriptors[i].addr = m_rx_buffer_region->paddr() + E1000_RX_BUFFER_SIZE * i;
rx_descriptors[i].status = 0;
}
@ -209,7 +202,6 @@ namespace Kernel
auto* tx_descriptors = reinterpret_cast<volatile e1000_tx_desc*>(m_tx_descriptor_region->vaddr());
for (size_t i = 0; i < E1000_TX_DESCRIPTOR_COUNT; i++)
{
m_tx_buffers[i] = reinterpret_cast<void*>(m_tx_buffer_region->vaddr() + E1000_TX_BUFFER_SIZE * i);
tx_descriptors[i].addr = m_tx_buffer_region->paddr() + E1000_TX_BUFFER_SIZE * i;
tx_descriptors[i].cmd = 0;
}
@ -300,8 +292,10 @@ namespace Kernel
break;
ASSERT_LTE((uint16_t)descriptor.length, E1000_RX_BUFFER_SIZE);
// FIXME: do something with the packet :)
dprintln("got {} byte packet", (uint16_t)descriptor.length);
NetworkManager::get().on_receive(BAN::ConstByteSpan {
reinterpret_cast<const uint8_t*>(m_rx_buffer_region->vaddr() + rx_current * E1000_RX_BUFFER_SIZE),
descriptor.length
});
descriptor.status = 0;
write32(REG_RDT0, rx_current);

55
kernel/kernel/Networking/IPv4.cpp
View File

@ -4,50 +4,19 @@
namespace Kernel
{
struct IPv4Header
void add_ipv4_header(BAN::ByteSpan packet, BAN::IPv4Address src_ipv4, BAN::IPv4Address dst_ipv4, uint8_t protocol)
{
uint8_t version_IHL;
uint8_t DSCP_ECN;
BAN::NetworkEndian<uint16_t> total_length;
BAN::NetworkEndian<uint16_t> identification;
BAN::NetworkEndian<uint16_t> flags_frament;
uint8_t time_to_live;
uint8_t protocol;
BAN::NetworkEndian<uint16_t> header_checksum;
BAN::NetworkEndian<uint32_t> src_address;
BAN::NetworkEndian<uint32_t> dst_address;
uint16_t checksum() const
{
return 0xFFFF
- (((uint16_t)version_IHL << 8) | DSCP_ECN)
- total_length
- identification
- flags_frament
- (((uint16_t)time_to_live << 8) | protocol);
}
};
static_assert(sizeof(IPv4Header) == 20);
BAN::ErrorOr<void> add_ipv4_header(BAN::Vector<uint8_t>& packet, uint32_t src_ipv4, uint32_t dst_ipv4, uint8_t protocol)
{
TRY(packet.resize(packet.size() + sizeof(IPv4Header)));
memmove(packet.data() + sizeof(IPv4Header), packet.data(), packet.size() - sizeof(IPv4Header));
auto* header = reinterpret_cast<IPv4Header*>(packet.data());
header->version_IHL = 0x45;
header->DSCP_ECN = 0x10;
header->total_length = packet.size();
header->identification = 1;
header->flags_frament = 0x00;
header->time_to_live = 0x40;
header->protocol = protocol;
header->header_checksum = header->checksum();
header->src_address = src_ipv4;
header->dst_address = dst_ipv4;
return {};
auto& header = packet.as<IPv4Header>();
header.version_IHL = 0x45;
header.DSCP_ECN = 0x10;
header.total_length = packet.size();
header.identification = 1;
header.flags_frament = 0x00;
header.time_to_live = 0x40;
header.protocol = protocol;
header.checksum = header.calculate_checksum();
header.src_address = src_ipv4;
header.dst_address = dst_ipv4;
}
}

24
kernel/kernel/Networking/NetworkInterface.cpp
View File

@ -10,8 +10,8 @@ namespace Kernel
struct EthernetHeader
{
uint8_t dst_mac[6];
uint8_t src_mac[6];
BAN::MACAddress dst_mac;
BAN::MACAddress src_mac;
BAN::NetworkEndian<uint16_t> ether_type;
};
static_assert(sizeof(EthernetHeader) == 14);
@ -40,19 +40,19 @@ namespace Kernel
m_name[3] = minor(m_rdev) + '0';
}
BAN::ErrorOr<void> NetworkInterface::add_interface_header(BAN::Vector<uint8_t>& packet, uint8_t destination_mac[6])
size_t NetworkInterface::interface_header_size() const
{
ASSERT(m_type == Type::Ethernet);
return sizeof(EthernetHeader);
}
TRY(packet.resize(packet.size() + sizeof(EthernetHeader)));
memmove(packet.data() + sizeof(EthernetHeader), packet.data(), packet.size() - sizeof(EthernetHeader));
auto* header = reinterpret_cast<EthernetHeader*>(packet.data());
memcpy(header->dst_mac, destination_mac, 6);
memcpy(header->src_mac, get_mac_address(), 6);
header->ether_type = 0x0800; // ipv4
return {};
void NetworkInterface::add_interface_header(BAN::ByteSpan packet, BAN::MACAddress destination)
{
ASSERT(m_type == Type::Ethernet);
auto& header = packet.as<EthernetHeader>();
header.dst_mac = destination;
header.src_mac = get_mac_address();
header.ether_type = 0x0800;
}
}

25
kernel/kernel/Networking/NetworkManager.cpp
View File

@ -1,7 +1,9 @@
#include <BAN/Endianness.h>
#include <BAN/UniqPtr.h>
#include <kernel/FS/DevFS/FileSystem.h>
#include <kernel/Networking/E1000/E1000.h>
#include <kernel/Networking/E1000/E1000E.h>
#include <kernel/Networking/IPv4.h>
#include <kernel/Networking/NetworkManager.h>
#include <kernel/Networking/UDPSocket.h>
@ -106,4 +108,27 @@ namespace Kernel
return {};
}
void NetworkManager::on_receive(BAN::ConstByteSpan packet)
{
// FIXME: properly handle packet parsing
auto ipv4 = packet.slice(14);
auto& ipv4_header = ipv4.as<const IPv4Header>();
auto src_ipv4 = ipv4_header.src_address;
auto udp = ipv4.slice(20);
auto& udp_header = udp.as<const UDPHeader>();
uint16_t src_port = udp_header.src_port;
uint16_t dst_port = udp_header.dst_port;
if (!m_bound_sockets.contains(dst_port))
{
dprintln("no one is listening on port {}", dst_port);
return;
}
auto raw = udp.slice(8);
m_bound_sockets[dst_port].lock()->add_packet(raw, src_ipv4, src_port);
}
}

58
kernel/kernel/Networking/NetworkSocket.cpp
View File

@ -65,18 +65,62 @@ namespace Kernel
return BAN::Error::from_errno(EINVAL);
}
static uint8_t dest_mac[6] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
static BAN::MACAddress dest_mac {{ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }};
const size_t interface_header_offset = 0;
const size_t interface_header_size = m_interface->interface_header_size();
const size_t ipv4_header_offset = interface_header_offset + interface_header_size;
const size_t ipv4_header_size = sizeof(IPv4Header);
const size_t protocol_header_offset = ipv4_header_offset + ipv4_header_size;
const size_t protocol_header_size = this->protocol_header_size();
const size_t payload_offset = protocol_header_offset + protocol_header_size;
const size_t payload_size = message.size();
BAN::Vector<uint8_t> full_packet;
TRY(full_packet.resize(message.size()));
memcpy(full_packet.data(), message.data(), message.size());
TRY(add_protocol_header(full_packet, m_port, destination->sin_port));
TRY(add_ipv4_header(full_packet, m_interface->get_ipv4_address(), destination->sin_addr.s_addr, protocol()));
TRY(m_interface->add_interface_header(full_packet, dest_mac));
TRY(full_packet.resize(payload_offset + payload_size));
TRY(m_interface->send_raw_bytes(BAN::ConstByteSpan { full_packet.span() }));
BAN::ByteSpan packet_bytespan { full_packet.span() };
memcpy(full_packet.data() + payload_offset, message.data(), payload_size);
add_protocol_header(packet_bytespan.slice(protocol_header_offset), m_port, destination->sin_port);
add_ipv4_header(packet_bytespan.slice(ipv4_header_offset), m_interface->get_ipv4_address(), destination->sin_addr.s_addr, protocol());
m_interface->add_interface_header(packet_bytespan.slice(interface_header_offset), dest_mac);
TRY(m_interface->send_raw_bytes(packet_bytespan));
return arguments->length;
}
BAN::ErrorOr<ssize_t> NetworkSocket::recvfrom_impl(sys_recvfrom_t* arguments)
{
sockaddr_in* sender_addr = nullptr;
if (arguments->address)
{
ASSERT(arguments->address_len);
if (*arguments->address_len < (socklen_t)sizeof(sockaddr_in))
*arguments->address_len = 0;
else
{
sender_addr = reinterpret_cast<sockaddr_in*>(arguments->address);
*arguments->address_len = sizeof(sockaddr_in);
}
}
if (!m_interface)
{
dprintln("No interface bound");
return BAN::Error::from_errno(EINVAL);
}
if (m_port == PORT_NONE)
{
dprintln("No port bound");
return BAN::Error::from_errno(EINVAL);
}
return TRY(read_packet(BAN::ByteSpan { reinterpret_cast<uint8_t*>(arguments->buffer), arguments->length }, sender_addr));
}
}

102
kernel/kernel/Networking/UDPSocket.cpp
View File

@ -1,39 +1,101 @@
#include <BAN/Endianness.h>
#include <kernel/Memory/Heap.h>
#include <kernel/Networking/UDPSocket.h>
#include <kernel/Thread.h>
namespace Kernel
{
struct UDPHeader
{
BAN::NetworkEndian<uint16_t> src_port;
BAN::NetworkEndian<uint16_t> dst_port;
BAN::NetworkEndian<uint16_t> length;
BAN::NetworkEndian<uint16_t> checksum;
};
static_assert(sizeof(UDPHeader) == 8);
BAN::ErrorOr<BAN::RefPtr<UDPSocket>> UDPSocket::create(mode_t mode, uid_t uid, gid_t gid)
{
return TRY(BAN::RefPtr<UDPSocket>::create(mode, uid, gid));
auto socket = TRY(BAN::RefPtr<UDPSocket>::create(mode, uid, gid));
socket->m_packet_buffer = TRY(VirtualRange::create_to_vaddr_range(
PageTable::kernel(),
KERNEL_OFFSET,
~(uintptr_t)0,
packet_buffer_size,
PageTable::Flags::ReadWrite | PageTable::Flags::Present,
true
));
return socket;
}
UDPSocket::UDPSocket(mode_t mode, uid_t uid, gid_t gid)
: NetworkSocket(mode, uid, gid)
{ }
BAN::ErrorOr<void> UDPSocket::add_protocol_header(BAN::Vector<uint8_t>& packet, uint16_t src_port, uint16_t dst_port)
void UDPSocket::add_protocol_header(BAN::ByteSpan packet, uint16_t src_port, uint16_t dst_port)
{
TRY(packet.resize(packet.size() + sizeof(UDPHeader)));
memmove(packet.data() + sizeof(UDPHeader), packet.data(), packet.size() - sizeof(UDPHeader));
auto& header = packet.as<UDPHeader>();
header.src_port = src_port;
header.dst_port = dst_port;
header.length = packet.size();
header.checksum = 0;
}
auto* header = reinterpret_cast<UDPHeader*>(packet.data());
header->src_port = src_port;
header->dst_port = dst_port;
header->length = packet.size();
header->checksum = 0;
void UDPSocket::add_packet(BAN::ConstByteSpan packet, BAN::IPv4Address sender_addr, uint16_t sender_port)
{
CriticalScope _;
return {};
if (m_packets.full())
{
dprintln("Packet buffer full, dropping packet");
return;
}
if (!m_packets.empty() && m_packet_total_size > m_packet_buffer->size())
{
dprintln("Packet buffer full, dropping packet");
return;
}
void* buffer = reinterpret_cast<void*>(m_packet_buffer->vaddr() + m_packet_total_size);
memcpy(buffer, packet.data(), packet.size());
m_packets.push(PacketInfo {
.sender_addr = sender_addr,
.sender_port = sender_port,
.packet_size = packet.size()
});
m_packet_total_size += packet.size();
m_semaphore.unblock();
}
BAN::ErrorOr<size_t> UDPSocket::read_packet(BAN::ByteSpan buffer, sockaddr_in* sender_addr)
{
while (m_packets.empty())
TRY(Thread::current().block_or_eintr(m_semaphore));
CriticalScope _;
if (m_packets.empty())
return read_packet(buffer, sender_addr);
auto packet_info = m_packets.front();
m_packets.pop();
size_t nread = BAN::Math::min<size_t>(packet_info.packet_size, buffer.size());
memcpy(
buffer.data(),
(const void*)m_packet_buffer->vaddr(),
nread
);
memmove(
(void*)m_packet_buffer->vaddr(),
(void*)(m_packet_buffer->vaddr() + packet_info.packet_size),
m_packet_total_size - packet_info.packet_size
);
m_packet_total_size -= packet_info.packet_size;
if (sender_addr)
{
sender_addr->sin_family = AF_INET;
sender_addr->sin_port = packet_info.sender_port;
sender_addr->sin_addr.s_addr = packet_info.sender_addr.as_u32();
}
return nread;
}
}

24
kernel/kernel/Process.cpp
View File

@ -915,7 +915,6 @@ namespace Kernel
return 0;
}
BAN::ErrorOr<long> Process::sys_sendto(const sys_sendto_t* arguments)
{
LockGuard _(m_lock);
@ -930,6 +929,29 @@ namespace Kernel
return TRY(inode->sendto(arguments));
}
BAN::ErrorOr<long> Process::sys_recvfrom(sys_recvfrom_t* arguments)
{
if (arguments->address && !arguments->address_len)
return BAN::Error::from_errno(EINVAL);
if (!arguments->address && arguments->address_len)
return BAN::Error::from_errno(EINVAL);
LockGuard _(m_lock);
TRY(validate_pointer_access(arguments, sizeof(sys_recvfrom_t)));
TRY(validate_pointer_access(arguments->buffer, arguments->length));
if (arguments->address)
{
TRY(validate_pointer_access(arguments->address_len, sizeof(*arguments->address_len)));
TRY(validate_pointer_access(arguments->address, *arguments->address_len));
}
auto inode = TRY(m_open_file_descriptors.inode_of(arguments->socket));
if (!inode->mode().ifsock())
return BAN::Error::from_errno(ENOTSOCK);
return TRY(inode->recvfrom(arguments));
}
BAN::ErrorOr<long> Process::sys_pipe(int fildes[2])
{
LockGuard _(m_lock);

3
kernel/kernel/Syscall.cpp
View File

@ -222,6 +222,9 @@ namespace Kernel
case SYS_SENDTO:
ret = Process::current().sys_sendto((const sys_sendto_t*)arg1);
break;
case SYS_RECVFROM:
ret = Process::current().sys_recvfrom((sys_recvfrom_t*)arg1);
break;
default:
dwarnln("Unknown syscall {}", syscall);
break;

10
libc/include/sys/socket.h
View File

@ -115,6 +115,16 @@ struct sys_sendto_t
socklen_t dest_len;
};
struct sys_recvfrom_t
{
int socket;
void* buffer;
size_t length;
int flags;
struct sockaddr* address;
socklen_t* address_len;
};
int accept(int socket, struct sockaddr* __restrict address, socklen_t* __restrict address_len);
int bind(int socket, const struct sockaddr* address, socklen_t address_len);
int connect(int socket, const struct sockaddr* address, socklen_t address_len);

1
libc/include/sys/syscall.h
View File

@ -66,6 +66,7 @@ __BEGIN_DECLS
#define SYS_SOCKET 65
#define SYS_BIND 66
#define SYS_SENDTO 67
#define SYS_RECVFROM 68
__END_DECLS

14
libc/sys/socket.cpp
View File

@ -7,6 +7,20 @@ int bind(int socket, const struct sockaddr* address, socklen_t address_len)
return syscall(SYS_BIND, socket, address, address_len);
}
ssize_t recvfrom(int socket, void* __restrict buffer, size_t length, int flags, struct sockaddr* __restrict address, socklen_t* __restrict address_len)
{
sys_recvfrom_t arguments {
.socket = socket,
.buffer = buffer,
.length = length,
.flags = flags,
.address = address,
.address_len = address_len
};
return syscall(SYS_RECVFROM, &arguments);
}
ssize_t sendto(int socket, const void* message, size_t length, int flags, const struct sockaddr* dest_addr, socklen_t dest_len)
{
sys_sendto_t arguments {