Userspace: Implement super simple DHCP client

Scheduler doesn't have to depend on the fact that allocations should
work when same amount of memory is just deallocated

BAN/include/BAN/Endianness.h

@@ -58,6 +58,11 @@ namespace BAN
 	template<integral T>
 	struct LittleEndian
 	{
+		constexpr LittleEndian(T value)
+		{
+			raw = host_to_little_endian(value);
+		}
+
 		constexpr operator T() const
 		{
 			return host_to_little_endian(raw);
@@ -69,6 +74,11 @@ namespace BAN
 	template<integral T>
 	struct BigEndian
 	{
+		constexpr BigEndian(T value)
+		{
+			raw = host_to_big_endian(value);
+		}
+
 		constexpr operator T() const
 		{
 			return host_to_big_endian(raw);
@@ -77,4 +87,7 @@ namespace BAN
 		T raw;
 	};
 
+	template<integral T>
+	using NetworkEndian = BigEndian<T>;
+
 }

BAN/include/BAN/IPv4.h

@@ -0,0 +1,73 @@
+#pragma once
+
+#include <BAN/Formatter.h>
+#include <BAN/Hash.h>
+
+namespace BAN
+{
+
+	struct IPv4Address
+	{
+		constexpr IPv4Address(uint32_t u32_address)
+		{
+			address[0] = u32_address >> 24;
+			address[1] = u32_address >> 16;
+			address[2] = u32_address >>  8;
+			address[3] = u32_address >>  0;
+		}
+
+		constexpr uint32_t as_u32() const
+		{
+			return
+				((uint32_t)address[0] << 24) |
+				((uint32_t)address[1] << 16) |
+				((uint32_t)address[2] <<  8) |
+				((uint32_t)address[3] <<  0);
+		}
+
+		constexpr bool operator==(const IPv4Address& other) const
+		{
+			return
+				address[0] == other.address[0] &&
+				address[1] == other.address[1] &&
+				address[2] == other.address[2] &&
+				address[3] == other.address[3];
+		}
+
+		uint8_t address[4];
+	};
+	static_assert(sizeof(IPv4Address) == 4);
+
+	template<>
+	struct hash<IPv4Address>
+	{
+		constexpr hash_t operator()(IPv4Address ipv4) const
+		{
+			return hash<uint32_t>()(ipv4.as_u32());
+		}
+	};
+
+}
+
+namespace BAN::Formatter
+{
+
+	template<typename F>
+	void print_argument(F putc, const IPv4Address& ipv4, const ValueFormat&)
+	{
+		ValueFormat format {
+			.base = 10,
+			.percision = 0,
+			.fill = 0,
+			.upper = false,
+		};
+
+		print_argument(putc, ipv4.address[0], format);
+		for (size_t i = 1; i < 4; i++)
+		{
+			putc('.');
+			print_argument(putc, ipv4.address[i], format);
+		}
+	}
+
+}

BAN/include/BAN/LinkedList.h

@@ -42,6 +42,8 @@ namespace BAN
 		iterator remove(iterator);
 		void clear();
 
+		iterator move_element_to_other_linked_list(LinkedList& dest_list, iterator dest_iter, iterator src_iter);
+
 		iterator begin()				{ return iterator(m_data, empty()); }
 		const_iterator begin() const	{ return const_iterator(m_data, empty()); }
 		iterator end()					{ return iterator(m_last, true); }
@@ -65,7 +67,11 @@ namespace BAN
 			Node* prev;
 		};
 
-		ErrorOr<Node*> allocate_node() const;
+		template<typename... Args>
+		ErrorOr<Node*> allocate_node(Args&&...) const;
+
+		Node* remove_node(iterator);
+		void insert_node(iterator, Node*);
 
 		Node* m_data = nullptr;
 		Node* m_last = nullptr;
@@ -137,6 +143,31 @@ namespace BAN
 		return *this;
 	}
 
+	template<typename T>
+	LinkedList<T>::Node* LinkedList<T>::remove_node(iterator iter)
+	{
+		ASSERT(!empty() && iter);
+		Node* node = iter.m_current;
+		Node* prev = node->prev;
+		Node* next = node->next;
+		(prev ? prev->next : m_data) = next;
+		(next ? next->prev : m_last) = prev;
+		m_size--;
+		return node;
+	}
+
+	template<typename T>
+	void LinkedList<T>::insert_node(iterator iter, Node* node)
+	{
+		Node* next = iter.m_past_end ? nullptr : iter.m_current;
+		Node* prev = next ? next->prev : m_last;
+		node->next = next;
+		node->prev = prev;
+		(prev ? prev->next : m_data) = node;
+		(next ? next->prev : m_last) = node;
+		m_size++;
+	}
+
 	template<typename T>
 	ErrorOr<void> LinkedList<T>::push_back(const T& value)
 	{
@@ -158,15 +189,8 @@ namespace BAN
 	template<typename T>
 	ErrorOr<void> LinkedList<T>::insert(iterator iter, T&& value)
 	{
-		Node* next = iter.m_past_end ? nullptr : iter.m_current;
-		Node* prev = next ? next->prev : m_last;
-		Node* new_node = TRY(allocate_node());
-		new (&new_node->value) T(move(value));
-		new_node->next = next;
-		new_node->prev = prev;
-		(prev ? prev->next : m_data) = new_node;
-		(next ? next->prev : m_last) = new_node;
-		m_size++;
+		Node* new_node = TRY(allocate_node(move(value)));
+		insert_node(iter, new_node);
 		return {};
 	}
 
@@ -181,21 +205,15 @@ namespace BAN
 	template<typename... Args>
 	ErrorOr<void> LinkedList<T>::emplace(iterator iter, Args&&... args)
 	{
-		Node* next = iter.m_past_end ? nullptr : iter.m_current;
-		Node* prev = next ? next->prev : m_last;
-		Node* new_node = TRY(allocate_node());
-		new (&new_node->value) T(forward<Args>(args)...);
-		new_node->next = next;
-		new_node->prev = prev;
-		(prev ? prev->next : m_data) = new_node;
-		(next ? next->prev : m_last) = new_node;
-		m_size++;
+		Node* new_node = TRY(allocate_node(forward<Args>(args)...));
+		insert_node(iter, new_node);
 		return {};
 	}
 
 	template<typename T>
 	void LinkedList<T>::pop_back()
 	{
+		ASSERT(!empty());
 		remove(iterator(m_last, false));
 	}
 
@@ -203,14 +221,10 @@ namespace BAN
 	LinkedList<T>::iterator LinkedList<T>::remove(iterator iter)
 	{
 		ASSERT(!empty() && iter);
-		Node* node = iter.m_current;
-		Node* prev = node->prev;
+		Node* node = remove_node(iter);
 		Node* next = node->next;
 		node->value.~T();
 		BAN::deallocator(node);
-		(prev ? prev->next : m_data) = next;
-		(next ? next->prev : m_last) = prev;
-		m_size--;
 		return next ? iterator(next, false) : iterator(m_last, true);
 	}
 
@@ -230,6 +244,16 @@ namespace BAN
 		m_size = 0;
 	}
 
+	template<typename T>
+	LinkedList<T>::iterator LinkedList<T>::move_element_to_other_linked_list(LinkedList& dest_list, iterator dest_iter, iterator src_iter)
+	{
+		ASSERT(!empty() && src_iter);
+		Node* node = remove_node(src_iter);
+		iterator ret = node->next ? iterator(node->next, false) : iterator(m_last, true);
+		dest_list.insert_node(dest_iter, node);
+		return ret;
+	}
+
 	template<typename T>
 	const T& LinkedList<T>::back() const
 	{
@@ -284,11 +308,13 @@ namespace BAN
 	}
 
 	template<typename T>
-	ErrorOr<typename LinkedList<T>::Node*> LinkedList<T>::allocate_node() const
+	template<typename... Args>
+	ErrorOr<typename LinkedList<T>::Node*> LinkedList<T>::allocate_node(Args&&... args) const
 	{
 		Node* node = (Node*)BAN::allocator(sizeof(Node));
 		if (node == nullptr)
 			return Error::from_errno(ENOMEM);
+		new (&node->value) T(forward<Args>(args)...);
 		return node;
 	}
 

BAN/include/BAN/MAC.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <BAN/Formatter.h>
+
+namespace BAN
+{
+
+	struct MACAddress
+	{
+		uint8_t address[6];
+	};
+
+}
+
+namespace BAN::Formatter
+{
+
+	template<typename F>
+	void print_argument(F putc, const MACAddress& mac, const ValueFormat&)
+	{
+		ValueFormat format {
+			.base = 16,
+			.percision = 0,
+			.fill = 2,
+			.upper = true,
+		};
+
+		print_argument(putc, mac.address[0], format);
+		for (size_t i = 1; i < 6; i++)
+		{
+			putc(':');
+			print_argument(putc, mac.address[i], format);
+		}
+	}
+
+}

BAN/include/BAN/Sort.h

@@ -1,8 +1,9 @@
 #pragma once
 
+#include <BAN/Math.h>
 #include <BAN/Swap.h>
 #include <BAN/Traits.h>
-#include <BAN/Math.h>
+#include <BAN/Vector.h>
 
 namespace BAN::sort
 {
@@ -175,6 +176,61 @@ namespace BAN::sort
 		detail::intro_sort_impl(begin, end, 2 * Math::ilog2(len), comp);
 	}
 
+	namespace detail
+	{
+
+		template<unsigned_integral T>
+		consteval T lsb_index(T value)
+		{
+			for (T result = 0;; result++)
+				if (value & (1 << result))
+					return result;
+		}
+
+	}
+
+	template<typename It, size_t radix = 256>
+	requires is_unsigned_v<typename It::value_type> && (radix > 0 && (radix & (radix - 1)) == 0)
+	BAN::ErrorOr<void> radix_sort(It begin, It end)
+	{
+		using value_type = typename It::value_type;
+
+		const size_t len = distance(begin, end);
+		if (len <= 1)
+			return {};
+
+		Vector<value_type> temp;
+		TRY(temp.resize(len));
+
+		Vector<size_t> counts;
+		TRY(counts.resize(radix));
+
+		constexpr size_t mask  = radix - 1;
+		constexpr size_t shift = detail::lsb_index(radix);
+
+		for (size_t s = 0; s < sizeof(value_type) * 8; s += shift)
+		{
+			for (auto& cnt : counts)
+				cnt = 0;
+			for (It it = begin; it != end; ++it)
+				counts[(*it >> s) & mask]++;
+
+			for (size_t i = 0; i < radix - 1; i++)
+				counts[i + 1] += counts[i];
+
+			for (It it = end; it != begin;)
+			{
+				--it;
+				temp[--counts[(*it >> s) & mask]] = *it;
+			}
+
+			for (size_t j = 0; j < temp.size(); j++)
+				*next(begin, j) = temp[j];
+		}
+
+		return {};
+	}
+
 	template<typename It, typename Comp = less<typename It::value_type>>
 	void sort(It begin, It end, Comp comp = {})
 	{

kernel/CMakeLists.txt

@@ -49,7 +49,14 @@ set(KERNEL_SOURCES
 	kernel/Memory/MemoryRegion.cpp
 	kernel/Memory/PhysicalRange.cpp
 	kernel/Memory/VirtualRange.cpp
-	kernel/Networking/E1000.cpp
+	kernel/Networking/ARPTable.cpp
+	kernel/Networking/E1000/E1000.cpp
+	kernel/Networking/E1000/E1000E.cpp
+	kernel/Networking/IPv4.cpp
+	kernel/Networking/NetworkInterface.cpp
+	kernel/Networking/NetworkManager.cpp
+	kernel/Networking/NetworkSocket.cpp
+	kernel/Networking/UDPSocket.cpp
 	kernel/OpenFileDescriptorSet.cpp
 	kernel/Panic.cpp
 	kernel/PCI.cpp

kernel/include/kernel/FS/Inode.h

@@ -11,6 +11,7 @@
 #include <kernel/Credentials.h>
 #include <kernel/SpinLock.h>
 
+#include <sys/socket.h>
 #include <sys/types.h>
 #include <time.h>
 
@@ -86,6 +87,8 @@ namespace Kernel
 		virtual bool is_pipe() const { return false; }
 		virtual bool is_tty() const { return false; }
 
+		void on_close();
+
 		// Directory API
 		BAN::ErrorOr<BAN::RefPtr<Inode>> find_inode(BAN::StringView);
 		BAN::ErrorOr<void> list_next_inodes(off_t, DirectoryEntryList*, size_t);
@@ -96,6 +99,11 @@ namespace Kernel
 		// Link API
 		BAN::ErrorOr<BAN::String> link_target();
 
+		// 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);
 		BAN::ErrorOr<size_t> write(off_t, BAN::ConstByteSpan buffer);
@@ -104,7 +112,11 @@ namespace Kernel
 		BAN::ErrorOr<void> chown(uid_t, gid_t);
 		bool has_data() const;
 
+		BAN::ErrorOr<long> ioctl(int request, void* arg);
+
 	protected:
+		virtual void on_close_impl() {}
+
 		// Directory API
 		virtual BAN::ErrorOr<BAN::RefPtr<Inode>> find_inode_impl(BAN::StringView)				{ return BAN::Error::from_errno(ENOTSUP); }
 		virtual BAN::ErrorOr<void> list_next_inodes_impl(off_t, DirectoryEntryList*, size_t)	{ return BAN::Error::from_errno(ENOTSUP); }
@@ -115,6 +127,11 @@ namespace Kernel
 		// Link API
 		virtual BAN::ErrorOr<BAN::String> link_target_impl()				{ return BAN::Error::from_errno(ENOTSUP); }
 
+		// 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> 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); }
 		virtual BAN::ErrorOr<size_t> write_impl(off_t, BAN::ConstByteSpan)	{ return BAN::Error::from_errno(ENOTSUP); }
@@ -123,6 +140,8 @@ namespace Kernel
 		virtual BAN::ErrorOr<void> chown_impl(uid_t, gid_t)					{ return BAN::Error::from_errno(ENOTSUP); }
 		virtual bool has_data_impl() const { dwarnln("nonblock not supported"); return true; }
 
+		virtual BAN::ErrorOr<long> ioctl_impl(int request, void* arg)		{ return BAN::Error::from_errno(ENOTSUP); }
+
 	protected:
 		mutable RecursivePrioritySpinLock m_lock;
 

kernel/include/kernel/Networking/ARPTable.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <BAN/HashMap.h>
+#include <BAN/UniqPtr.h>
+#include <kernel/Networking/NetworkInterface.h>
+
+namespace Kernel
+{
+
+	class ARPTable
+	{
+		BAN_NON_COPYABLE(ARPTable);
+		BAN_NON_MOVABLE(ARPTable);
+
+	public:
+		static BAN::ErrorOr<BAN::UniqPtr<ARPTable>> create();
+
+		BAN::ErrorOr<BAN::MACAddress> get_mac_from_ipv4(NetworkInterface&, BAN::IPv4Address);
+
+		void handle_arp_packet(BAN::ConstByteSpan);
+
+	private:
+		ARPTable();
+
+	private:
+		struct ARPReply
+		{
+			BAN::IPv4Address ipv4_address { 0 };
+			BAN::MACAddress mac_address;
+		};
+
+	private:
+		SpinLock m_lock;
+
+		BAN::HashMap<BAN::IPv4Address, BAN::MACAddress> m_arp_table;
+
+		BAN::Atomic<bool>	m_has_got_reply;
+		ARPReply			m_reply;
+
+		friend class BAN::UniqPtr<ARPTable>;
+	};
+
+}

kernel/include/kernel/Networking/E1000.h

@@ -1,62 +0,0 @@
-#pragma once
-
-#include <BAN/UniqPtr.h>
-#include <kernel/InterruptController.h>
-#include <kernel/Networking/NetworkDriver.h>
-#include <kernel/PCI.h>
-
-#define E1000_NUM_RX_DESC 32
-#define E1000_NUM_TX_DESC 8
-
-namespace Kernel
-{
-
-	class E1000 final : public NetworkDriver, public Interruptable
-	{
-	public:
-		static bool probe(PCI::Device&);
-		static BAN::ErrorOr<BAN::UniqPtr<E1000>> create(PCI::Device&);
-		~E1000();
-
-		virtual uint8_t* get_mac_address() override { return m_mac_address; }
-		virtual BAN::ErrorOr<void> send_packet(const void* data, uint16_t len) override;
-
-		virtual bool link_up() override { return m_link_up; }
-		virtual int link_speed() override;
-
-		virtual void handle_irq() override { ASSERT_NOT_REACHED(); }
-
-	private:
-		E1000(PCI::Device& pci_device) : m_pci_device(pci_device) {}
-		BAN::ErrorOr<void> initialize();
-
-		static void interrupt_handler();
-
-		uint32_t read32(uint16_t reg);
-		void write32(uint16_t reg, uint32_t value);
-
-		void detect_eeprom();
-		uint32_t eeprom_read(uint8_t addr);
-		BAN::ErrorOr<void> read_mac_address();
-
-		void initialize_rx();
-		void initialize_tx();
-
-		void enable_link();
-		BAN::ErrorOr<void> enable_interrupts();
-
-		void handle_receive();
-
-	private:
-		PCI::Device&			m_pci_device;
-		BAN::UniqPtr<PCI::BarRegion> m_bar_region;
-		bool					m_has_eerprom { false };
-		uint8_t					m_mac_address[6] {};
-		uint16_t				m_rx_current {};
-		uint16_t				m_tx_current {};
-		struct e1000_rx_desc*	m_rx_descs[E1000_NUM_RX_DESC] {};
-		struct e1000_tx_desc*	m_tx_descs[E1000_NUM_TX_DESC] {};
-		bool					m_link_up { false };
-	};
-
-}

kernel/include/kernel/Networking/E1000/Definitions.h

@@ -0,0 +1,202 @@
+#pragma once
+
+#include <stdint.h>
+
+namespace Kernel
+{
+
+	enum E1000_REG : uint32_t
+	{
+		REG_CTRL	= 0x0000,
+		REG_STATUS	= 0x0008,
+		REG_EERD	= 0x0014,
+		REG_ICR		= 0x00C0,
+		REG_ITR		= 0x00C4,
+		REG_IMS		= 0x00D0,
+		REG_IMC		= 0x00D8,
+		REG_IVAR	= 0x00E4,
+		REG_EITR	= 0x00E8,
+		REG_RCTL	= 0x0100,
+		REG_TCTL	= 0x0400,
+		REG_TIPG	= 0x0410,
+		REG_RDBAL0	= 0x2800,
+		REG_RDBAH0	= 0x2804,
+		REG_RDLEN0	= 0x2808,
+		REG_RDH0	= 0x2810,
+		REG_RDT0	= 0x2818,
+		REG_TDBAL	= 0x3800,
+		REG_TDBAH	= 0x3804,
+		REG_TDLEN	= 0x3808,
+		REG_TDH		= 0x3810,
+		REG_TDT		= 0x3818,
+		REG_MTA		= 0x5200,
+	};
+
+	enum E1000_CTRL : uint32_t
+	{
+		CTRL_FD			= 1u << 0,
+		CTRL_GIOMD		= 1u << 2,
+		CTRL_ASDE		= 1u << 5,
+		CTRL_SLU		= 1u << 6,
+		CTRL_FRCSPD		= 1u << 11,
+		CTRL_FCRDBLX	= 1u << 12,
+		CTRL_ADVD3WUC	= 1u << 20,
+		CTRL_RST		= 1u << 26,
+		CTRL_RFCE		= 1u << 27,
+		CTRL_TFCE		= 1u << 28,
+		CTRL_VME		= 1u << 30,
+		CTRL_PHY_RST	= 1u << 31,
+
+		CTRL_SPEED_10MB		= 0b00 << 8,
+		CTRL_SPEED_100MB	= 0b01 << 8,
+		CTRL_SPEED_1000MB1	= 0b10 << 8,
+		CTRL_SPEED_1000MB2	= 0b11 << 8,
+	};
+
+	enum E1000_STATUS : uint32_t
+	{
+		STATUS_LU = 1 << 1,
+
+		STATUS_SPEED_MASK		= 0b11 << 6,
+		STATUS_SPEED_10MB		= 0b00 << 6,
+		STATUS_SPEED_100MB		= 0b01 << 6,
+		STATUS_SPEED_1000MB1	= 0b10 << 6,
+		STATUS_SPEED_1000MB2	= 0b11 << 6,
+	};
+
+	enum E1000_ICR : uint32_t
+	{
+		ICR_TXDW	= 1 << 0,
+		ICR_TXQE	= 1 << 1,
+		ICR_LSC		= 1 << 2,
+		ICR_RXDMT0	= 1 << 4,
+		ICR_RXO		= 1 << 6,
+		ICR_RXT0	= 1 << 7,
+		ICR_MDAC	= 1 << 9,
+		ICR_TXD_LOW	= 1 << 15,
+		ICR_SRPD	= 1 << 16,
+		ICR_ACK		= 1 << 17,
+		ICR_MNG		= 1 << 18,
+		ICR_RxQ0	= 1 << 20,
+		ICR_RxQ1	= 1 << 21,
+		ICR_TxQ0	= 1 << 22,
+		ICR_TxQ1	= 1 << 23,
+		ICR_Other	= 1 << 24,
+	};
+
+	enum E1000_IMS : uint32_t
+	{
+		IMS_TXDW	= 1 << 0,
+		IMS_TXQE	= 1 << 1,
+		IMS_LSC		= 1 << 2,
+		IMS_RXDMT0	= 1 << 4,
+		IMS_RXO		= 1 << 6,
+		IMS_RXT0	= 1 << 7,
+		IMS_MDAC	= 1 << 9,
+		IMS_TXD_LOW	= 1 << 15,
+		IMS_SRPD	= 1 << 16,
+		IMS_ACK		= 1 << 17,
+		IMS_MNG		= 1 << 18,
+		IMS_RxQ0	= 1 << 20,
+		IMS_RxQ1	= 1 << 21,
+		IMS_TxQ0	= 1 << 22,
+		IMS_TxQ1	= 1 << 23,
+		IMS_Other	= 1 << 24,
+	};
+
+	enum E1000_IMC : uint32_t
+	{
+		IMC_TXDW	= 1 << 0,
+		IMC_TXQE	= 1 << 1,
+		IMC_LSC		= 1 << 2,
+		IMC_RXDMT0	= 1 << 4,
+		IMC_RXO		= 1 << 6,
+		IMC_RXT0	= 1 << 7,
+		IMC_MDAC	= 1 << 9,
+		IMC_TXD_LOW	= 1 << 15,
+		IMC_SRPD	= 1 << 16,
+		IMC_ACK		= 1 << 17,
+		IMC_MNG		= 1 << 18,
+		IMC_RxQ0	= 1 << 20,
+		IMC_RxQ1	= 1 << 21,
+		IMC_TxQ0	= 1 << 22,
+		IMC_TxQ1	= 1 << 23,
+		IMC_Other	= 1 << 24,
+	};
+
+	enum E1000_TCTL : uint32_t
+	{
+		TCTL_EN			= 1 << 1,
+		TCTL_PSP		= 1 << 3,
+		TCTL_CT_IEEE	= 15 << 4,
+		TCTL_SWXOFF		= 1 << 22,
+		TCTL_PBE		= 1 << 23,
+		TCTL_RCTL		= 1 << 24,
+		TCTL_UNORTX		= 1 << 25,
+		TCTL_MULR		= 1 << 28,
+	};
+
+	enum E1000_RCTL : uint32_t
+	{
+		RCTL_EN		= 1 << 1,
+		RCTL_SBP	= 1 << 2,
+		RCTL_UPE	= 1 << 3,
+		RCTL_MPE	= 1 << 4,
+		RCTL_BAM	= 1 << 15,
+		RCTL_VFE	= 1 << 18,
+		RCTL_CFIEN	= 1 << 19,
+		RCTL_CFI	= 1 << 20,
+		RCTL_DPF	= 1 << 22,
+		RCTL_PMCF	= 1 << 23,
+		RCTL_BSEX	= 1 << 25,
+		RCTL_SECRC	= 1 << 26,
+
+		RCTL_RDMTS_1_2	= 0b00 << 8,
+		RCTL_RDMTS_1_4	= 0b01 << 8,
+		RCTL_RDMTS_1_8	= 0b10 << 8,
+
+		RCTL_LBM_NORMAL	= 0b00 << 6,
+		RCTL_LBM_MAC	= 0b01 << 6,
+
+		RCTL_BSIZE_256		= (0b11 << 16),
+		RCTL_BSIZE_512		= (0b10 << 16),
+		RCTL_BSIZE_1024		= (0b01 << 16),
+		RCTL_BSIZE_2048		= (0b00 << 16),
+		RCTL_BSIZE_4096		= (0b11 << 16) | RCTL_BSEX,
+		RCTL_BSIZE_8192		= (0b10 << 16) | RCTL_BSEX,
+		RCTL_BSIZE_16384	= (0b01 << 16) | RCTL_BSEX,
+	};
+
+	enum E1000_CMD : uint8_t
+	{
+		CMD_EOP		= 1 << 0,
+		CMD_IFCS	= 1 << 1,
+		CMD_IC		= 1 << 2,
+		CMD_RS		= 1 << 3,
+		CMD_DEXT	= 1 << 5,
+		CMD_VLE		= 1 << 6,
+		CMD_IDE		= 1 << 7,
+	};
+
+	struct e1000_rx_desc
+	{
+		uint64_t addr;
+		uint16_t length;
+		uint16_t checksum;
+		uint8_t status;
+		uint8_t errors;
+		uint16_t special;
+	} __attribute__((packed));
+
+	struct e1000_tx_desc
+	{
+		uint64_t addr;
+		uint16_t length;
+		uint8_t cso;
+		uint8_t cmd;
+		uint8_t status;
+		uint8_t css;
+		uint16_t special;
+	} __attribute__((packed));
+
+}

kernel/include/kernel/Networking/E1000/E1000.h

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <BAN/UniqPtr.h>
+#include <kernel/InterruptController.h>
+#include <kernel/Memory/DMARegion.h>
+#include <kernel/Networking/E1000/Definitions.h>
+#include <kernel/Networking/NetworkInterface.h>
+#include <kernel/PCI.h>
+
+#define E1000_RX_DESCRIPTOR_COUNT 256
+#define E1000_TX_DESCRIPTOR_COUNT 256
+
+#define E1000_RX_BUFFER_SIZE 8192
+#define E1000_TX_BUFFER_SIZE 8192
+
+namespace Kernel
+{
+
+	class E1000 : public NetworkInterface, public Interruptable
+	{
+	public:
+		static bool probe(PCI::Device&);
+		static BAN::ErrorOr<BAN::RefPtr<E1000>> create(PCI::Device&);
+		~E1000();
+
+		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;
+
+		virtual void handle_irq() final override;
+
+	protected:
+		E1000(PCI::Device& pci_device)
+			: m_pci_device(pci_device)
+		{ }
+		BAN::ErrorOr<void> initialize();
+
+		virtual void detect_eeprom();
+		virtual uint32_t eeprom_read(uint8_t addr);
+
+		uint32_t read32(uint16_t reg);
+		void write32(uint16_t reg, uint32_t value);
+
+		virtual BAN::ErrorOr<void> send_raw_bytes(BAN::ConstByteSpan) override;
+
+	private:
+		BAN::ErrorOr<void> read_mac_address();
+
+		BAN::ErrorOr<void> initialize_rx();
+		BAN::ErrorOr<void> initialize_tx();
+
+		void enable_link();
+		BAN::ErrorOr<void> enable_interrupt();
+
+		void handle_receive();
+
+	protected:
+		PCI::Device&					m_pci_device;
+		BAN::UniqPtr<PCI::BarRegion>	m_bar_region;
+		bool							m_has_eerprom { false };
+
+	private:
+		BAN::UniqPtr<DMARegion>	m_rx_buffer_region;
+		BAN::UniqPtr<DMARegion>	m_tx_buffer_region;
+		BAN::UniqPtr<DMARegion>	m_rx_descriptor_region;
+		BAN::UniqPtr<DMARegion>	m_tx_descriptor_region;
+
+		BAN::MACAddress	m_mac_address {};
+		bool		m_link_up { false };
+
+		friend class BAN::RefPtr<E1000>;
+	};
+
+}

kernel/include/kernel/Networking/E1000/E1000E.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <kernel/Networking/E1000/E1000.h>
+
+namespace Kernel
+{
+
+	class E1000E final : public E1000
+	{
+	public:
+		static bool probe(PCI::Device&);
+		static BAN::ErrorOr<BAN::RefPtr<E1000E>> create(PCI::Device&);
+
+	protected:
+		virtual void detect_eeprom() override;
+		virtual uint32_t eeprom_read(uint8_t addr) override;
+
+	private:
+		E1000E(PCI::Device& pci_device)
+			: E1000(pci_device)
+		{ }
+
+	private:
+		friend class BAN::RefPtr<E1000E>;
+	};
+
+}

kernel/include/kernel/Networking/IPv4.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <BAN/ByteSpan.h>
+#include <BAN/Endianness.h>
+#include <BAN/IPv4.h>
+#include <BAN/Vector.h>
+
+namespace Kernel
+{
+
+	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);
+
+}

kernel/include/kernel/Networking/NetworkDriver.h

@@ -1,20 +0,0 @@
-#pragma once
-
-#include <BAN/Errors.h>
-
-namespace Kernel
-{
-
-	class NetworkDriver
-	{
-	public:
-		virtual ~NetworkDriver() {}
-
-		virtual uint8_t* get_mac_address() = 0;
-		virtual BAN::ErrorOr<void> send_packet(const void* data, uint16_t len) = 0;
-
-		virtual bool link_up() = 0;
-		virtual int link_speed() = 0;
-	};
-
-}

kernel/include/kernel/Networking/NetworkInterface.h

@@ -0,0 +1,70 @@
+#pragma once
+
+#include <BAN/Errors.h>
+#include <BAN/ByteSpan.h>
+#include <BAN/MAC.h>
+#include <kernel/Device/Device.h>
+#include <kernel/Networking/IPv4.h>
+
+namespace Kernel
+{
+
+	struct EthernetHeader
+	{
+		BAN::MACAddress dst_mac;
+		BAN::MACAddress src_mac;
+		BAN::NetworkEndian<uint16_t> ether_type;
+	};
+	static_assert(sizeof(EthernetHeader) == 14);
+
+	enum EtherType : uint16_t
+	{
+		IPv4 = 0x0800,
+		ARP = 0x0806,
+	};
+
+	class NetworkInterface : public CharacterDevice
+	{
+		BAN_NON_COPYABLE(NetworkInterface);
+		BAN_NON_MOVABLE(NetworkInterface);
+
+	public:
+		enum class Type
+		{
+			Ethernet,
+		};
+
+	public:
+		NetworkInterface();
+		virtual ~NetworkInterface() {}
+
+		virtual BAN::MACAddress get_mac_address() const = 0;
+
+		BAN::IPv4Address get_ipv4_address() const { return m_ipv4_address; }
+		void set_ipv4_address(BAN::IPv4Address new_address) { m_ipv4_address = new_address; }
+
+		BAN::IPv4Address get_netmask() const { return m_netmask; }
+		void set_netmask(BAN::IPv4Address new_netmask) { m_netmask = new_netmask; }
+
+		virtual bool link_up() = 0;
+		virtual int link_speed() = 0;
+
+		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; }
+
+		virtual BAN::ErrorOr<void> send_raw_bytes(BAN::ConstByteSpan) = 0;
+
+	private:
+		const Type m_type;
+
+		const dev_t m_rdev;
+		char m_name[10];
+
+		BAN::IPv4Address m_ipv4_address { 0 };
+		BAN::IPv4Address m_netmask { 0 };
+	};
+
+}

kernel/include/kernel/Networking/NetworkManager.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include <BAN/Vector.h>
+#include <kernel/FS/TmpFS/FileSystem.h>
+#include <kernel/Networking/ARPTable.h>
+#include <kernel/Networking/NetworkInterface.h>
+#include <kernel/Networking/NetworkSocket.h>
+#include <kernel/PCI.h>
+
+#include <netinet/in.h>
+
+namespace Kernel
+{
+
+	class NetworkManager : public TmpFileSystem
+	{
+		BAN_NON_COPYABLE(NetworkManager);
+		BAN_NON_MOVABLE(NetworkManager);
+
+	public:
+		enum class SocketType
+		{
+			STREAM,
+			DGRAM,
+			SEQPACKET,
+		};
+
+	public:
+		static BAN::ErrorOr<void> initialize();
+		static NetworkManager& get();
+
+		ARPTable& arp_table() { return *m_arp_table; }
+
+		BAN::ErrorOr<void> add_interface(PCI::Device& pci_device);
+
+		void unbind_socket(uint16_t port, BAN::RefPtr<NetworkSocket>);
+		BAN::ErrorOr<void> bind_socket(uint16_t port, BAN::RefPtr<NetworkSocket>);
+
+		BAN::ErrorOr<BAN::RefPtr<NetworkSocket>> create_socket(SocketType, mode_t, uid_t, gid_t);
+
+		void on_receive(BAN::ConstByteSpan);
+
+	private:
+		NetworkManager();
+
+	private:
+		BAN::UniqPtr<ARPTable>							m_arp_table;
+		BAN::Vector<BAN::RefPtr<NetworkInterface>>		m_interfaces;
+		BAN::HashMap<int, BAN::WeakPtr<NetworkSocket>>	m_bound_sockets;
+	};
+
+}

kernel/include/kernel/Networking/NetworkSocket.h

@@ -0,0 +1,53 @@
+#pragma once
+
+#include <BAN/WeakPtr.h>
+#include <kernel/FS/TmpFS/Inode.h>
+#include <kernel/Networking/NetworkInterface.h>
+
+#include <netinet/in.h>
+
+namespace Kernel
+{
+
+	enum NetworkProtocol : uint8_t
+	{
+		UDP = 0x11,
+	};
+
+	class NetworkSocket : public TmpInode, public BAN::Weakable<NetworkSocket>
+	{
+		BAN_NON_COPYABLE(NetworkSocket);
+		BAN_NON_MOVABLE(NetworkSocket);
+
+	public:
+		static constexpr uint16_t PORT_NONE = 0;
+
+	public:
+		void bind_interface_and_port(NetworkInterface*, uint16_t port);
+		~NetworkSocket();
+
+		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 NetworkProtocol 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;
+
+		virtual BAN::ErrorOr<long> ioctl_impl(int request, void* arg) override;
+
+	protected:
+		NetworkInterface*	m_interface	= nullptr;
+		uint16_t			m_port		= PORT_NONE;
+	};
+
+}

kernel/include/kernel/Networking/UDPSocket.h

@@ -0,0 +1,55 @@
+#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 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 NetworkProtocol protocol() const override { return NetworkProtocol::UDP; }
+
+	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>;
+	};
+
+}

kernel/include/kernel/OpenFileDescriptorSet.h

@@ -23,6 +23,8 @@ namespace Kernel
 
 		BAN::ErrorOr<int> open(BAN::StringView absolute_path, int flags);
 
+		BAN::ErrorOr<int> socket(int domain, int type, int protocol);
+
 		BAN::ErrorOr<void> pipe(int fds[2]);
 
 		BAN::ErrorOr<int> dup(int);

kernel/include/kernel/Process.h

@@ -16,6 +16,7 @@
 
 #include <sys/banan-os.h>
 #include <sys/mman.h>
+#include <sys/socket.h>
 #include <termios.h>
 
 namespace LibELF { class LoadableELF; }
@@ -111,6 +112,13 @@ namespace Kernel
 		BAN::ErrorOr<long> sys_chmod(const char*, mode_t);
 		BAN::ErrorOr<long> sys_chown(const char*, uid_t, gid_t);
 
+		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_ioctl(int fildes, int request, void* arg);
+
 		BAN::ErrorOr<long> sys_pipe(int fildes[2]);
 		BAN::ErrorOr<long> sys_dup(int fildes);
 		BAN::ErrorOr<long> sys_dup2(int fildes, int fildes2);

kernel/include/kernel/Scheduler.h

@@ -44,34 +44,26 @@ namespace Kernel
 		BAN::ErrorOr<void> add_thread(Thread*);
 
 	private:
-		struct ActiveThread
+		struct SchedulerThread
 		{
-			ActiveThread(Thread* thread) : thread(thread) {}
-			Thread* thread;
-			uint64_t padding;
-		};
+			SchedulerThread(Thread* thread)
+				: thread(thread)
+			{}
 
-		struct SleepingThread
-		{
-			SleepingThread(Thread* thread, uint64_t wake_time) : thread(thread), wake_time(wake_time) {}
 			Thread* thread;
+			union
+			{
 				uint64_t	wake_time;
-		};
-
-		struct BlockingThread
-		{
-			BlockingThread(Thread* thread, Semaphore* semaphore) : thread(thread), semaphore(semaphore) {}
-			Thread* thread;
 				Semaphore*	semaphore;
-			uint8_t padding[sizeof(uint64_t) - sizeof(Semaphore*)];
+			};
 		};
 
 		Thread* m_idle_thread { nullptr };
-		BAN::LinkedList<ActiveThread> m_active_threads;
-		BAN::LinkedList<SleepingThread> m_sleeping_threads;
-		BAN::LinkedList<BlockingThread> m_blocking_threads;
+		BAN::LinkedList<SchedulerThread> m_active_threads;
+		BAN::LinkedList<SchedulerThread> m_sleeping_threads;
+		BAN::LinkedList<SchedulerThread> m_blocking_threads;
 
-		BAN::LinkedList<ActiveThread>::iterator m_current_thread;
+		BAN::LinkedList<SchedulerThread>::iterator m_current_thread;
 
 		friend class Process;
 	};

kernel/kernel/FS/Inode.cpp

@@ -56,6 +56,12 @@ namespace Kernel
 		return true;
 	}
 
+	void Inode::on_close()
+	{
+		LockGuard _(m_lock);
+		on_close_impl();
+	}
+
 	BAN::ErrorOr<BAN::RefPtr<Inode>> Inode::find_inode(BAN::StringView name)
 	{
 		LockGuard _(m_lock);
@@ -110,6 +116,30 @@ namespace Kernel
 		return link_target_impl();
 	}
 
+	BAN::ErrorOr<void> Inode::bind(const sockaddr* address, socklen_t address_len)
+	{
+		LockGuard _(m_lock);
+		if (!mode().ifsock())
+			return BAN::Error::from_errno(ENOTSOCK);
+		return bind_impl(address, address_len);
+	}
+
+	BAN::ErrorOr<ssize_t> Inode::sendto(const sys_sendto_t* arguments)
+	{
+		LockGuard _(m_lock);
+		if (!mode().ifsock())
+			return BAN::Error::from_errno(ENOTSOCK);
+		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);
@@ -153,4 +183,10 @@ namespace Kernel
 		return has_data_impl();
 	}
 
+	BAN::ErrorOr<long> Inode::ioctl(int request, void* arg)
+	{
+		LockGuard _(m_lock);
+		return ioctl_impl(request, arg);
+	}
+
 }

kernel/kernel/Networking/ARPTable.cpp

@@ -0,0 +1,108 @@
+#include <kernel/LockGuard.h>
+#include <kernel/Networking/ARPTable.h>
+#include <kernel/Timer/Timer.h>
+
+namespace Kernel
+{
+
+	struct ARPPacket
+	{
+		BAN::NetworkEndian<uint16_t>	htype;
+		BAN::NetworkEndian<uint16_t>	ptype;
+		BAN::NetworkEndian<uint8_t>		hlen;
+		BAN::NetworkEndian<uint8_t>		plen;
+		BAN::NetworkEndian<uint16_t>	oper;
+		BAN::MACAddress					sha;
+		BAN::IPv4Address				spa;
+		BAN::MACAddress					tha;
+		BAN::IPv4Address				tpa;
+	};
+	static_assert(sizeof(ARPPacket) == 28);
+
+	enum ARPOperation : uint16_t
+	{
+		Request = 1,
+		Reply = 2,
+	};
+
+	static constexpr BAN::IPv4Address	s_broadcast_ipv4 { 0xFFFFFFFF };
+	static constexpr BAN::MACAddress	s_broadcast_mac {{ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }};
+
+	BAN::ErrorOr<BAN::UniqPtr<ARPTable>> ARPTable::create()
+	{
+		return TRY(BAN::UniqPtr<ARPTable>::create());
+	}
+
+	ARPTable::ARPTable()
+	{
+
+	}
+
+	BAN::ErrorOr<BAN::MACAddress> ARPTable::get_mac_from_ipv4(NetworkInterface& interface, BAN::IPv4Address ipv4_address)
+	{
+		LockGuard _(m_lock);
+
+		if (ipv4_address == s_broadcast_ipv4)
+			return s_broadcast_mac;
+		if (m_arp_table.contains(ipv4_address))
+			return m_arp_table[ipv4_address];
+
+		BAN::Vector<uint8_t> full_packet_buffer;
+		TRY(full_packet_buffer.resize(sizeof(ARPPacket) + sizeof(EthernetHeader)));
+		auto full_packet = BAN::ByteSpan { full_packet_buffer.span() };
+
+		auto& ethernet_header = full_packet.as<EthernetHeader>();
+		ethernet_header.dst_mac = s_broadcast_mac;
+		ethernet_header.src_mac = interface.get_mac_address();
+		ethernet_header.ether_type = EtherType::ARP;
+
+		auto& arp_request = full_packet.slice(sizeof(EthernetHeader)).as<ARPPacket>();
+		arp_request.htype = 0x0001;
+		arp_request.ptype = EtherType::IPv4;
+		arp_request.hlen = 0x06;
+		arp_request.plen = 0x04;
+		arp_request.oper = ARPOperation::Request;
+		arp_request.sha = interface.get_mac_address();
+		arp_request.spa = interface.get_ipv4_address();
+		arp_request.tha = {{ 0, 0, 0, 0, 0, 0 }};
+		arp_request.tpa = ipv4_address;
+
+		TRY(interface.send_raw_bytes(full_packet));
+
+		uint64_t timeout = SystemTimer::get().ms_since_boot() + 5'000;
+		while (!m_has_got_reply)
+			if (SystemTimer::get().ms_since_boot() >= timeout)
+				return BAN::Error::from_errno(ETIMEDOUT);
+		ASSERT_EQ(m_reply.ipv4_address, ipv4_address);
+
+		BAN::MACAddress mac_address = m_reply.mac_address;
+		(void)m_arp_table.insert(ipv4_address, m_reply.mac_address);
+		m_has_got_reply = false;
+
+		dprintln("IPv4 {} resolved to MAC {}", ipv4_address, mac_address);
+
+		return mac_address;
+	}
+
+	void ARPTable::handle_arp_packet(BAN::ConstByteSpan buffer)
+	{
+		auto& arp_packet = buffer.as<const ARPPacket>();
+		if (arp_packet.oper != ARPOperation::Reply)
+		{
+			dprintln("Unhandled non-rely ARP packet (operation {2H})", (uint16_t)arp_packet.oper);
+			return;
+		}
+
+		if (arp_packet.ptype != EtherType::IPv4)
+		{
+			dprintln("Unhandled non-ipv4 ARP packet (ptype {2H})", (uint16_t)arp_packet.ptype);
+			return;
+		}
+
+		ASSERT(!m_has_got_reply);
+		m_has_got_reply = true;
+		m_reply.ipv4_address = arp_packet.spa;
+		m_reply.mac_address = arp_packet.sha;
+	}
+
+}

kernel/kernel/Networking/E1000.cpp

@@ -1,374 +0,0 @@
-#include <kernel/IDT.h>
-#include <kernel/InterruptController.h>
-#include <kernel/IO.h>
-#include <kernel/Memory/PageTable.h>
-#include <kernel/MMIO.h>
-#include <kernel/Networking/E1000.h>
-
-#define DEBUG_E1000 1
-
-#define E1000_REG_CTRL				0x0000
-#define E1000_REG_STATUS			0x0008
-#define E1000_REG_EEPROM			0x0014
-#define E1000_REG_INT_CAUSE_READ	0x00C0
-#define E1000_REG_INT_RATE			0x00C4
-#define E1000_REG_INT_MASK_SET		0x00D0
-#define E1000_REG_INT_MASK_CLEAR	0x00D8
-#define E1000_REG_RCTRL				0x0100
-#define E1000_REG_RXDESCLO			0x2800
-#define E1000_REG_RXDESCHI			0x2804
-#define E1000_REG_RXDESCLEN			0x2808
-#define E1000_REG_RXDESCHEAD		0x2810
-#define E1000_REG_RXDESCTAIL		0x2818
-#define E1000_REG_TXDESCLO			0x3800
-#define E1000_REG_TXDESCHI			0x3804
-#define E1000_REG_TXDESCLEN			0x3808
-#define E1000_REG_TXDESCHEAD		0x3810
-#define E1000_REG_TXDESCTAIL		0x3818
-#define E1000_REG_TCTRL				0x0400
-#define E1000_REG_TIPG				0x0410
-
-#define E1000_STATUS_LINK_UP		0x02
-#define E1000_STATUS_SPEED_MASK		0xC0
-#define E1000_STATUS_SPEED_10MB		0x00
-#define E1000_STATUS_SPEED_100MB	0x40
-#define E1000_STATUS_SPEED_1000MB1	0x80
-#define E1000_STATUS_SPEED_1000MB2	0xC0
-
-#define E1000_CTRL_SET_LINK_UP		0x40
-
-#define E1000_INT_TXDW		(1 << 0)
-#define E1000_INT_TXQE		(1 << 1)
-#define E1000_INT_LSC		(1 << 2)
-#define E1000_INT_RXSEQ		(1 << 3)
-#define E1000_INT_RXDMT0	(1 << 4)
-#define E1000_INT_RXO		(1 << 6)
-#define E1000_INT_RXT0		(1 << 7)
-#define E1000_INT_MDAC		(1 << 9)
-#define E1000_INT_RXCFG		(1 << 10)
-#define E1000_INT_PHYINT	(1 << 12)
-#define E1000_INT_TXD_LOW	(1 << 15)
-#define E1000_INT_SRPD		(1 << 16)
-
-
-#define E1000_TCTL_EN			(1 << 1)
-#define E1000_TCTL_PSP			(1 << 3)
-#define E1000_TCTL_CT_SHIFT		4
-#define E1000_TCTL_COLD_SHIFT	12
-#define E1000_TCTL_SWXOFF		(1 << 22)
-#define E1000_TCTL_RTLC			(1 << 24)
-
-#define E1000_RCTL_EN				(1 << 1)
-#define E1000_RCTL_SBP				(1 << 2)
-#define E1000_RCTL_UPE				(1 << 3)
-#define E1000_RCTL_MPE				(1 << 4)
-#define E1000_RCTL_LPE				(1 << 5)
-#define E1000_RCTL_LBM_NONE			(0 << 6)
-#define E1000_RCTL_LBM_PHY			(3 << 6)
-#define E1000_RTCL_RDMTS_HALF		(0 << 8)
-#define E1000_RTCL_RDMTS_QUARTER	(1 << 8)
-#define E1000_RTCL_RDMTS_EIGHTH		(2 << 8)
-#define E1000_RCTL_MO_36			(0 << 12)
-#define E1000_RCTL_MO_35			(1 << 12)
-#define E1000_RCTL_MO_34			(2 << 12)
-#define E1000_RCTL_MO_32			(3 << 12)
-#define E1000_RCTL_BAM				(1 << 15)
-#define E1000_RCTL_VFE				(1 << 18)
-#define E1000_RCTL_CFIEN			(1 << 19)
-#define E1000_RCTL_CFI				(1 << 20)
-#define E1000_RCTL_DPF				(1 << 22)
-#define E1000_RCTL_PMCF				(1 << 23)
-#define E1000_RCTL_SECRC			(1 << 26)
-
-#define E1000_RCTL_BSIZE_256		(3 << 16)
-#define E1000_RCTL_BSIZE_512		(2 << 16)
-#define E1000_RCTL_BSIZE_1024		(1 << 16)
-#define E1000_RCTL_BSIZE_2048		(0 << 16)
-#define E1000_RCTL_BSIZE_4096		((3 << 16) | (1 << 25))
-#define E1000_RCTL_BSIZE_8192		((2 << 16) | (1 << 25))
-#define E1000_RCTL_BSIZE_16384		((1 << 16) | (1 << 25))
-
-namespace Kernel
-{
-
-	struct e1000_rx_desc
-	{
-		volatile uint64_t addr;
-		volatile uint16_t length;
-		volatile uint16_t checksum;
-		volatile uint8_t status;
-		volatile uint8_t errors;
-		volatile uint16_t special;
-	} __attribute__((packed));
-
-	struct e1000_tx_desc
-	{
-		volatile uint64_t addr;
-		volatile uint16_t length;
-		volatile uint8_t cso;
-		volatile uint8_t cmd;
-		volatile uint8_t status;
-		volatile uint8_t css;
-		volatile uint16_t special;
-	} __attribute__((packed));
-
-	// https://www.intel.com/content/dam/doc/manual/pci-pci-x-family-gbe-controllers-software-dev-manual.pdf (section 5.2)
-	bool E1000::probe(PCI::Device& pci_device)
-	{
-		// Intel device
-		if (pci_device.vendor_id() != 0x8086)
-			return false;
-
-		switch (pci_device.device_id())
-		{
-			case 0x1019:
-			case 0x101A:
-			case 0x1010:
-			case 0x1012:
-			case 0x101D:
-			case 0x1079:
-			case 0x107A:
-			case 0x107B:
-			case 0x100F:
-			case 0x1011:
-			case 0x1026:
-			case 0x1027:
-			case 0x1028:
-			case 0x1107:
-			case 0x1112:
-			case 0x1013:
-			case 0x1018:
-			case 0x1076:
-			case 0x1077:
-			case 0x1078:
-			case 0x1017:
-			case 0x1016:
-			case 0x100e:
-			case 0x1015:
-				return true;
-			default:
-				return false;
-		}
-	}
-
-	BAN::ErrorOr<BAN::UniqPtr<E1000>> E1000::create(PCI::Device& pci_device)
-	{
-		E1000* e1000 = new E1000();
-		ASSERT(e1000);
-		if (auto ret = e1000->initialize(pci_device); ret.is_error())
-		{
-			delete e1000;
-			return ret.release_error();
-		}
-		return BAN::UniqPtr<E1000>::adopt(e1000);
-	}
-
-	E1000::~E1000()
-	{
-	}
-
-	BAN::ErrorOr<void> E1000::initialize(PCI::Device& pci_device)
-	{
-		m_bar_region = TRY(pci_device.allocate_bar_region(0));
-		pci_device.enable_bus_mastering();
-
-		detect_eeprom();
-
-		TRY(read_mac_address());
-		
-
-		initialize_rx();
-		initialize_tx();
-
-		enable_link();
-		enable_interrupts();
-		
-#if DEBUG_E1000
-		dprintln("E1000 at PCI {}:{}.{}", pci_device.bus(), pci_device.dev(), 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("  link up: {}", link_up());
-		if (link_up())
-			dprintln("  link speed: {} Mbps", link_speed());
-#endif
-
-		return {};
-	}
-
-	void E1000::write32(uint16_t reg, uint32_t value)
-	{
-		m_bar_region->write32(reg, value);
-	}
-
-	uint32_t E1000::read32(uint16_t reg)
-	{
-		return m_bar_region->read32(reg);
-	}
-
-	void E1000::detect_eeprom()
-	{
-		m_has_eerprom = false;
-		write32(E1000_REG_EEPROM, 0x01);
-		for (int i = 0; i < 1000 && !m_has_eerprom; i++)
-			if (read32(E1000_REG_EEPROM) & 0x10)
-				m_has_eerprom = true;
-	}
-
-	uint32_t E1000::eeprom_read(uint8_t address)
-	{
-		uint32_t tmp = 0;
-		if (m_has_eerprom)
-		{
-			write32(E1000_REG_EEPROM, ((uint32_t)address << 8) | 1);
-			while (!((tmp = read32(E1000_REG_EEPROM)) & (1 << 4)))
-				continue;
-		}
-		else
-		{
-			write32(E1000_REG_EEPROM, ((uint32_t)address << 2) | 1);
-			while (!((tmp = read32(E1000_REG_EEPROM)) & (1 << 1)))
-				continue;
-		}
-		return (tmp >> 16) & 0xFFFF;
-	}
-
-	BAN::ErrorOr<void> E1000::read_mac_address()
-	{
-		if (m_has_eerprom)
-		{
-			uint32_t temp = eeprom_read(0);
-			m_mac_address[0] = temp;
-			m_mac_address[1] = temp >> 8;
-			
-			temp = eeprom_read(1);
-			m_mac_address[2] = temp;
-			m_mac_address[3] = temp >> 8;
-			
-			temp = eeprom_read(2);
-			m_mac_address[4] = temp;
-			m_mac_address[5] = temp >> 8;
-
-			return {};
-		}
-
-		if (read32(0x5400) == 0)
-		{
-			dwarnln("no mac address");
-			return BAN::Error::from_errno(EINVAL);
-		}
-
-		for (int i = 0; i < 6; i++)
-			m_mac_address[i] = (uint8_t)read32(0x5400 + i * 8);
-
-		return {};
-	}
-
-	void E1000::initialize_rx()
-	{
-		uint8_t* ptr = (uint8_t*)kmalloc(sizeof(e1000_rx_desc) * E1000_NUM_RX_DESC + 16, 16, true);
-		ASSERT(ptr);
-
-		e1000_rx_desc* descs = (e1000_rx_desc*)ptr;
-		for (int i = 0; i < E1000_NUM_RX_DESC; i++)
-		{
-			// FIXME
-			m_rx_descs[i] = &descs[i];
-			m_rx_descs[i]->addr = 0;
-			m_rx_descs[i]->status = 0;
-		}
-
-		write32(E1000_REG_RXDESCLO, (uintptr_t)ptr >> 32);
-		write32(E1000_REG_RXDESCHI, (uintptr_t)ptr & 0xFFFFFFFF);
-		write32(E1000_REG_RXDESCLEN, E1000_NUM_RX_DESC * sizeof(e1000_rx_desc));
-		write32(E1000_REG_RXDESCHEAD, 0);
-		write32(E1000_REG_RXDESCTAIL, E1000_NUM_RX_DESC - 1);
-
-		m_rx_current = 0;
-		
-		uint32_t rctrl = 0;
-		rctrl |= E1000_RCTL_EN;
-		rctrl |= E1000_RCTL_SBP;
-		rctrl |= E1000_RCTL_UPE;
-		rctrl |= E1000_RCTL_MPE;
-		rctrl |= E1000_RCTL_LBM_NONE;
-		rctrl |= E1000_RTCL_RDMTS_HALF;
-		rctrl |= E1000_RCTL_BAM;
-		rctrl |= E1000_RCTL_SECRC;
-		rctrl |= E1000_RCTL_BSIZE_8192;
-
-   		write32(E1000_REG_RCTRL, rctrl);
-	}
-
-	void E1000::initialize_tx()
-	{
-		auto* ptr = (uint8_t*)kmalloc(sizeof(e1000_tx_desc) * E1000_NUM_TX_DESC + 16, 16, true);
-		ASSERT(ptr);
-
-		auto* descs = (e1000_tx_desc*)ptr;
-		for(int i = 0; i < E1000_NUM_TX_DESC; i++)
-		{
-			// FIXME
-			m_tx_descs[i] = &descs[i];
-			m_tx_descs[i]->addr = 0;
-			m_tx_descs[i]->cmd = 0;
-		}
-
-		write32(E1000_REG_TXDESCHI, (uintptr_t)ptr >> 32);
-		write32(E1000_REG_TXDESCLO, (uintptr_t)ptr & 0xFFFFFFFF);
-		write32(E1000_REG_TXDESCLEN, E1000_NUM_TX_DESC * sizeof(e1000_tx_desc));
-		write32(E1000_REG_TXDESCHEAD, 0);
-		write32(E1000_REG_TXDESCTAIL, 0);
-
-		m_tx_current = 0;
-
-		write32(E1000_REG_TCTRL, read32(E1000_REG_TCTRL) | E1000_TCTL_EN | E1000_TCTL_PSP);
-		write32(E1000_REG_TIPG, 0x0060200A);
-	}
-
-	void E1000::enable_link()
-	{
-		write32(E1000_REG_CTRL, read32(E1000_REG_CTRL) | E1000_CTRL_SET_LINK_UP);
-		m_link_up = !!(read32(E1000_REG_STATUS) & E1000_STATUS_LINK_UP);
-	}
-
-	int E1000::link_speed()
-	{
-		if (!link_up())
-			return 0;
-		uint32_t speed = read32(E1000_REG_STATUS) & E1000_STATUS_SPEED_MASK;
-		if (speed == E1000_STATUS_SPEED_10MB)
-			return 10;
-		if (speed == E1000_STATUS_SPEED_100MB)
-			return 100;
-		if (speed == E1000_STATUS_SPEED_1000MB1)
-			return 1000;
-		if (speed == E1000_STATUS_SPEED_1000MB2)
-			return 1000;
-		return 0;
-	}
-
-	void E1000::enable_interrupts()
-	{
-		write32(E1000_REG_INT_RATE, 6000);
-		write32(E1000_REG_INT_MASK_SET, E1000_INT_LSC | E1000_INT_RXT0 | E1000_INT_RXO);
-		read32(E1000_REG_INT_CAUSE_READ);
-
-		// FIXME: implement PCI interrupt allocation
-		//IDT::register_irq_handler(irq, E1000::interrupt_handler);
-		//InterruptController::enable_irq(irq);
-	}
-
-	BAN::ErrorOr<void> E1000::send_packet(const void* data, uint16_t len)
-	{
-		(void)data;
-		(void)len;
-		return BAN::Error::from_errno(ENOTSUP);
-	}
-
-}

kernel/kernel/Networking/E1000/E1000.cpp

@@ -0,0 +1,305 @@
+#include <kernel/IDT.h>
+#include <kernel/InterruptController.h>
+#include <kernel/IO.h>
+#include <kernel/Memory/PageTable.h>
+#include <kernel/MMIO.h>
+#include <kernel/Networking/E1000/E1000.h>
+#include <kernel/Networking/NetworkManager.h>
+
+#define DEBUG_E1000 1
+
+namespace Kernel
+{
+
+	// https://www.intel.com/content/dam/doc/manual/pci-pci-x-family-gbe-controllers-software-dev-manual.pdf (section 5.2)
+	bool E1000::probe(PCI::Device& pci_device)
+	{
+		// Intel device
+		if (pci_device.vendor_id() != 0x8086)
+			return false;
+
+		switch (pci_device.device_id())
+		{
+			case 0x1019:
+			case 0x101A:
+			case 0x1010:
+			case 0x1012:
+			case 0x101D:
+			case 0x1079:
+			case 0x107A:
+			case 0x107B:
+			case 0x100F:
+			case 0x1011:
+			case 0x1026:
+			case 0x1027:
+			case 0x1028:
+			case 0x1107:
+			case 0x1112:
+			case 0x1013:
+			case 0x1018:
+			case 0x1076:
+			case 0x1077:
+			case 0x1078:
+			case 0x1017:
+			case 0x1016:
+			case 0x100e:
+			case 0x1015:
+				return true;
+			default:
+				return false;
+		}
+	}
+
+	BAN::ErrorOr<BAN::RefPtr<E1000>> E1000::create(PCI::Device& pci_device)
+	{
+		auto e1000 = TRY(BAN::RefPtr<E1000>::create(pci_device));
+		TRY(e1000->initialize());
+		return e1000;
+	}
+
+	E1000::~E1000()
+	{
+	}
+
+	BAN::ErrorOr<void> E1000::initialize()
+	{
+		m_bar_region = TRY(m_pci_device.allocate_bar_region(0));
+		m_pci_device.enable_bus_mastering();
+
+		detect_eeprom();
+		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: {}", m_mac_address);
+#endif
+
+		TRY(initialize_rx());
+		TRY(initialize_tx());
+
+		enable_link();
+		TRY(enable_interrupt());
+
+		m_link_up = !!(read32(REG_STATUS) & STATUS_LU);
+
+#if DEBUG_E1000
+		dprintln("  link up: {}", link_up());
+		if (link_up())
+		{
+			int speed = link_speed();
+			dprintln("  link speed: {} Mbps", speed);
+		}
+#endif
+
+		return {};
+	}
+
+	void E1000::write32(uint16_t reg, uint32_t value)
+	{
+		m_bar_region->write32(reg, value);
+	}
+
+	uint32_t E1000::read32(uint16_t reg)
+	{
+		return m_bar_region->read32(reg);
+	}
+
+	void E1000::detect_eeprom()
+	{
+		m_has_eerprom = false;
+		write32(REG_EERD, 0x01);
+		for (int i = 0; i < 1000 && !m_has_eerprom; i++)
+			if (read32(REG_EERD) & 0x10)
+				m_has_eerprom = true;
+	}
+
+	uint32_t E1000::eeprom_read(uint8_t address)
+	{
+		uint32_t tmp = 0;
+		if (m_has_eerprom)
+		{
+			write32(REG_EERD, ((uint32_t)address << 8) | 1);
+			while (!((tmp = read32(REG_EERD)) & (1 << 4)))
+				continue;
+		}
+		else
+		{
+			write32(REG_EERD, ((uint32_t)address << 2) | 1);
+			while (!((tmp = read32(REG_EERD)) & (1 << 1)))
+				continue;
+		}
+		return (tmp >> 16) & 0xFFFF;
+	}
+
+	BAN::ErrorOr<void> E1000::read_mac_address()
+	{
+		if (m_has_eerprom)
+		{
+			uint32_t temp = eeprom_read(0);
+			m_mac_address.address[0] = temp;
+			m_mac_address.address[1] = temp >> 8;
+
+			temp = eeprom_read(1);
+			m_mac_address.address[2] = temp;
+			m_mac_address.address[3] = temp >> 8;
+
+			temp = eeprom_read(2);
+			m_mac_address.address[4] = temp;
+			m_mac_address.address[5] = temp >> 8;
+
+			return {};
+		}
+
+		if (read32(0x5400) == 0)
+		{
+			dwarnln("no mac address");
+			return BAN::Error::from_errno(EINVAL);
+		}
+
+		for (int i = 0; i < 6; i++)
+			m_mac_address.address[i] = (uint8_t)read32(0x5400 + i * 8);
+
+		return {};
+	}
+
+	BAN::ErrorOr<void> E1000::initialize_rx()
+	{
+		m_rx_buffer_region = TRY(DMARegion::create(E1000_RX_BUFFER_SIZE * E1000_RX_DESCRIPTOR_COUNT));
+		m_rx_descriptor_region = TRY(DMARegion::create(sizeof(e1000_rx_desc) * E1000_RX_DESCRIPTOR_COUNT));
+
+		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++)
+		{
+			rx_descriptors[i].addr = m_rx_buffer_region->paddr() + E1000_RX_BUFFER_SIZE * i;
+			rx_descriptors[i].status = 0;
+		}
+
+		write32(REG_RDBAL0, m_rx_descriptor_region->paddr() & 0xFFFFFFFF);
+		write32(REG_RDBAH0, m_rx_descriptor_region->paddr() >> 32);
+		write32(REG_RDLEN0, E1000_RX_DESCRIPTOR_COUNT * sizeof(e1000_rx_desc));
+		write32(REG_RDH0, 0);
+		write32(REG_RDT0, E1000_RX_DESCRIPTOR_COUNT - 1);
+
+		uint32_t rctrl = 0;
+		rctrl |= RCTL_EN;
+		rctrl |= RCTL_SBP;
+		rctrl |= RCTL_UPE;
+		rctrl |= RCTL_MPE;
+		rctrl |= RCTL_LBM_NORMAL;
+		rctrl |= RCTL_RDMTS_1_2;
+		rctrl |= RCTL_BAM;
+		rctrl |= RCTL_SECRC;
+		rctrl |= RCTL_BSIZE_8192;
+   		write32(REG_RCTL, rctrl);
+
+		return {};
+	}
+
+	BAN::ErrorOr<void> E1000::initialize_tx()
+	{
+		m_tx_buffer_region = TRY(DMARegion::create(E1000_TX_BUFFER_SIZE * E1000_TX_DESCRIPTOR_COUNT));
+		m_tx_descriptor_region = TRY(DMARegion::create(sizeof(e1000_tx_desc) * E1000_TX_DESCRIPTOR_COUNT));
+
+		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++)
+		{
+			tx_descriptors[i].addr = m_tx_buffer_region->paddr() + E1000_TX_BUFFER_SIZE * i;
+			tx_descriptors[i].cmd = 0;
+		}
+
+		write32(REG_TDBAL, m_tx_descriptor_region->paddr() & 0xFFFFFFFF);
+		write32(REG_TDBAH, m_tx_descriptor_region->paddr() >> 32);
+		write32(REG_TDLEN, E1000_TX_DESCRIPTOR_COUNT * sizeof(e1000_tx_desc));
+		write32(REG_TDH, 0);
+		write32(REG_TDT, 0);
+
+		write32(REG_TCTL, TCTL_EN | TCTL_PSP);
+		write32(REG_TIPG, 0x0060200A);
+
+		return {};
+	}
+
+	void E1000::enable_link()
+	{
+		write32(REG_CTRL, read32(REG_CTRL) | CTRL_SLU);
+	}
+
+	int E1000::link_speed()
+	{
+		if (!link_up())
+			return 0;
+		uint32_t speed = read32(REG_STATUS) & STATUS_SPEED_MASK;
+		if (speed == STATUS_SPEED_10MB)
+			return 10;
+		if (speed == STATUS_SPEED_100MB)
+			return 100;
+		if (speed == STATUS_SPEED_1000MB1)
+			return 1000;
+		if (speed == STATUS_SPEED_1000MB2)
+			return 1000;
+		return 0;
+	}
+
+	BAN::ErrorOr<void> E1000::enable_interrupt()
+	{
+		write32(REG_ITR, 0x1000);
+
+		write32(REG_IVAR, 1 << 3);
+		write32(REG_EITR, 0x1000);
+
+		write32(REG_IMS, IMC_RxQ0);
+		read32(REG_ICR);
+
+		TRY(m_pci_device.reserve_irqs(1));
+		set_irq(m_pci_device.get_irq(0));
+		Interruptable::enable_interrupt();
+
+		return {};
+	}
+
+	BAN::ErrorOr<void> E1000::send_raw_bytes(BAN::ConstByteSpan buffer)
+	{
+		ASSERT_LTE(buffer.size(), E1000_TX_BUFFER_SIZE);
+
+		CriticalScope _;
+
+		size_t tx_current = read32(REG_TDT) % E1000_TX_DESCRIPTOR_COUNT;
+
+		auto* tx_buffer = reinterpret_cast<void*>(m_tx_buffer_region->vaddr() + E1000_TX_BUFFER_SIZE * tx_current);
+		memcpy(tx_buffer, buffer.data(), buffer.size());
+
+		auto& descriptor = reinterpret_cast<volatile e1000_tx_desc*>(m_tx_descriptor_region->vaddr())[tx_current];
+		descriptor.length = buffer.size();
+		descriptor.status = 0;
+		descriptor.cmd = CMD_EOP | CMD_IFCS | CMD_RS;
+
+		write32(REG_TDT, (tx_current + 1) % E1000_TX_DESCRIPTOR_COUNT);
+		while (descriptor.status == 0)
+			continue;
+
+		return {};
+	}
+
+	void E1000::handle_irq()
+	{
+		if (read32(REG_ICR) & ICR_RxQ0)
+			return;
+
+		for (;;) {
+			uint32_t rx_current = (read32(REG_RDT0) + 1) % E1000_RX_DESCRIPTOR_COUNT;
+
+			auto& descriptor = reinterpret_cast<volatile e1000_rx_desc*>(m_rx_descriptor_region->vaddr())[rx_current];
+			if (!(descriptor.status & 1))
+				break;
+			ASSERT_LTE((uint16_t)descriptor.length, E1000_RX_BUFFER_SIZE);
+
+			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);
+		}
+	}
+
+}

kernel/kernel/Networking/E1000/E1000E.cpp

@@ -0,0 +1,43 @@
+#include <kernel/Networking/E1000/E1000E.h>
+#include <kernel/Timer/Timer.h>
+
+#define E1000E_VENDOR_INTEL 0x8086
+#define E1000E_DEVICE_82574 0x10D3
+
+namespace Kernel
+{
+
+	bool E1000E::probe(PCI::Device& pci_device)
+	{
+		if (pci_device.vendor_id() != E1000E_VENDOR_INTEL)
+			return false;
+		switch (pci_device.device_id())
+		{
+			case E1000E_DEVICE_82574:
+				return true;
+		}
+		return false;
+	}
+
+	BAN::ErrorOr<BAN::RefPtr<E1000E>> E1000E::create(PCI::Device& pci_device)
+	{
+		auto e1000e = TRY(BAN::RefPtr<E1000E>::create(pci_device));
+		TRY(e1000e->initialize());
+		return e1000e;
+	}
+
+	void E1000E::detect_eeprom()
+	{
+		m_has_eerprom = true;
+	}
+
+	uint32_t E1000E::eeprom_read(uint8_t addr)
+	{
+		uint32_t tmp;
+		write32(REG_EERD, ((uint32_t)addr << 2) | 1);
+		while (!((tmp = read32(REG_EERD)) & (1 << 1)))
+			continue;
+		return tmp >> 16;
+	}
+
+}

kernel/kernel/Networking/IPv4.cpp

@@ -0,0 +1,22 @@
+#include <BAN/Endianness.h>
+#include <kernel/Networking/IPv4.h>
+
+namespace Kernel
+{
+
+	void add_ipv4_header(BAN::ByteSpan packet, BAN::IPv4Address src_ipv4, BAN::IPv4Address dst_ipv4, uint8_t protocol)
+	{
+		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;
+	}
+
+}

kernel/kernel/Networking/NetworkInterface.cpp

@@ -0,0 +1,50 @@
+#include <BAN/Endianness.h>
+#include <kernel/FS/DevFS/FileSystem.h>
+#include <kernel/Networking/NetworkInterface.h>
+
+#include <sys/sysmacros.h>
+#include <string.h>
+
+namespace Kernel
+{
+
+	static dev_t get_network_rdev_major()
+	{
+		static dev_t major = DevFileSystem::get().get_next_dev();
+		return major;
+	}
+
+	static dev_t get_network_rdev_minor()
+	{
+		static dev_t minor = 0;
+		return minor++;
+	}
+
+	NetworkInterface::NetworkInterface()
+		: CharacterDevice(0400, 0, 0)
+		, m_type(Type::Ethernet)
+		, m_rdev(makedev(get_network_rdev_major(), get_network_rdev_minor()))
+	{
+		ASSERT(minor(m_rdev) < 10);
+		ASSERT(m_type == Type::Ethernet);
+
+		strcpy(m_name, "ethx");
+		m_name[3] = minor(m_rdev) + '0';
+	}
+
+	size_t NetworkInterface::interface_header_size() const
+	{
+		ASSERT(m_type == Type::Ethernet);
+		return sizeof(EthernetHeader);
+	}
+
+	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;
+	}
+
+}

kernel/kernel/Networking/NetworkManager.cpp

@@ -0,0 +1,159 @@
+#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>
+
+namespace Kernel
+{
+
+	static BAN::UniqPtr<NetworkManager> s_instance;
+
+	BAN::ErrorOr<void> NetworkManager::initialize()
+	{
+		ASSERT(!s_instance);
+		NetworkManager* manager_ptr = new NetworkManager();
+		if (manager_ptr == nullptr)
+			return BAN::Error::from_errno(ENOMEM);
+		auto manager = BAN::UniqPtr<NetworkManager>::adopt(manager_ptr);
+		manager->m_arp_table = TRY(ARPTable::create());
+		TRY(manager->TmpFileSystem::initialize(0777, 0, 0));
+		s_instance = BAN::move(manager);
+		return {};
+	}
+
+	NetworkManager& NetworkManager::get()
+	{
+		ASSERT(s_instance);
+		return *s_instance;
+	}
+
+	NetworkManager::NetworkManager()
+		: TmpFileSystem(128)
+	{ }
+
+	BAN::ErrorOr<void> NetworkManager::add_interface(PCI::Device& pci_device)
+	{
+		BAN::RefPtr<NetworkInterface> interface;
+
+		switch (pci_device.subclass())
+		{
+			case 0x00:
+				if (E1000::probe(pci_device))
+				{
+					interface = TRY(E1000::create(pci_device));
+					break;
+				}
+				if (E1000E::probe(pci_device))
+				{
+					interface = TRY(E1000E::create(pci_device));
+					break;
+				}
+				// fall through
+			default:
+				dprintln("unsupported network controller (pci {2H}.{2H}.{2H})", pci_device.class_code(), pci_device.subclass(), pci_device.prog_if());
+				dprintln("  vendor id: {4H}", pci_device.vendor_id());
+				dprintln("  device id: {4H}", pci_device.device_id());
+				return BAN::Error::from_errno(ENOTSUP);
+		}
+
+		ASSERT(interface);
+
+		TRY(m_interfaces.push_back(interface));
+		DevFileSystem::get().add_device(interface);
+
+		return {};
+	}
+
+	BAN::ErrorOr<BAN::RefPtr<NetworkSocket>> NetworkManager::create_socket(SocketType type, mode_t mode, uid_t uid, gid_t gid)
+	{
+		ASSERT((mode & Inode::Mode::TYPE_MASK) == 0);
+
+		if (type != SocketType::DGRAM)
+			return BAN::Error::from_errno(EPROTOTYPE);
+
+		auto udp_socket = TRY(UDPSocket::create(mode | Inode::Mode::IFSOCK, uid, gid));
+		return BAN::RefPtr<NetworkSocket>(udp_socket);
+	}
+
+	void NetworkManager::unbind_socket(uint16_t port, BAN::RefPtr<NetworkSocket> socket)
+	{
+		if (m_bound_sockets.contains(port))
+		{
+			ASSERT(m_bound_sockets[port].valid());
+			ASSERT(m_bound_sockets[port].lock() == socket);
+			m_bound_sockets.remove(port);
+		}
+		NetworkManager::get().remove_from_cache(socket);
+	}
+
+	BAN::ErrorOr<void> NetworkManager::bind_socket(uint16_t port, BAN::RefPtr<NetworkSocket> socket)
+	{
+		if (m_interfaces.empty())
+			return BAN::Error::from_errno(EADDRNOTAVAIL);
+
+		if (port != NetworkSocket::PORT_NONE)
+		{
+			if (m_bound_sockets.contains(port))
+				return BAN::Error::from_errno(EADDRINUSE);
+			TRY(m_bound_sockets.insert(port, socket));
+		}
+
+		// FIXME: actually determine proper interface
+		auto interface = m_interfaces.front();
+		socket->bind_interface_and_port(interface.ptr(), port);
+
+		return {};
+	}
+
+	void NetworkManager::on_receive(BAN::ConstByteSpan packet)
+	{
+		auto ethernet_header = packet.as<const EthernetHeader>();
+
+		switch (ethernet_header.ether_type)
+		{
+			case EtherType::ARP:
+			{
+				m_arp_table->handle_arp_packet(packet.slice(sizeof(EthernetHeader)));
+				break;
+			}
+			case EtherType::IPv4:
+			{
+				auto ipv4 = packet.slice(sizeof(EthernetHeader));
+				auto& ipv4_header = ipv4.as<const IPv4Header>();
+				auto src_ipv4 = ipv4_header.src_address;
+				switch (ipv4_header.protocol)
+				{
+					case NetworkProtocol::UDP:
+					{
+						auto udp = ipv4.slice(sizeof(IPv4Header));
+						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);
+						break;
+					}
+					default:
+						dprintln("Unknown network protocol 0x{2H}", ipv4_header.protocol);
+						break;
+				}
+				break;
+			}
+			default:
+				dprintln("Unknown EtherType 0x{4H}", (uint16_t)ethernet_header.ether_type);
+				break;
+		}
+	}
+
+}

kernel/kernel/Networking/NetworkSocket.cpp

@@ -0,0 +1,185 @@
+#include <kernel/Networking/IPv4.h>
+#include <kernel/Networking/NetworkManager.h>
+#include <kernel/Networking/NetworkSocket.h>
+
+#include <net/if.h>
+
+namespace Kernel
+{
+
+	NetworkSocket::NetworkSocket(mode_t mode, uid_t uid, gid_t gid)
+		// FIXME: what the fuck is this
+		: TmpInode(
+			NetworkManager::get(),
+			MUST(NetworkManager::get().allocate_inode(create_inode_info(mode, uid, gid))),
+			create_inode_info(mode, uid, gid)
+		)
+	{ }
+
+	NetworkSocket::~NetworkSocket()
+	{
+	}
+
+	void NetworkSocket::on_close_impl()
+	{
+		if (m_interface)
+			NetworkManager::get().unbind_socket(m_port, this);
+	}
+
+	void NetworkSocket::bind_interface_and_port(NetworkInterface* interface, uint16_t port)
+	{
+		ASSERT(!m_interface);
+		ASSERT(interface);
+		m_interface = interface;
+		m_port = port;
+	}
+
+	BAN::ErrorOr<void> NetworkSocket::bind_impl(const sockaddr* address, socklen_t address_len)
+	{
+		if (address_len != sizeof(sockaddr_in))
+			return BAN::Error::from_errno(EINVAL);
+		auto* addr_in = reinterpret_cast<const sockaddr_in*>(address);
+		return NetworkManager::get().bind_socket(addr_in->sin_port, this);
+	}
+
+	BAN::ErrorOr<ssize_t> NetworkSocket::sendto_impl(const sys_sendto_t* arguments)
+	{
+		if (arguments->dest_len != sizeof(sockaddr_in))
+			return BAN::Error::from_errno(EINVAL);
+		if (arguments->flags)
+		{
+			dprintln("flags not supported");
+			return BAN::Error::from_errno(ENOTSUP);
+		}
+
+		if (!m_interface)
+			TRY(NetworkManager::get().bind_socket(PORT_NONE, this));
+
+		auto* destination = reinterpret_cast<const sockaddr_in*>(arguments->dest_addr);
+		auto  message = BAN::ConstByteSpan((const uint8_t*)arguments->message, arguments->length);
+
+		uint16_t dst_port = destination->sin_port;
+		if (dst_port == PORT_NONE)
+			return BAN::Error::from_errno(EINVAL);
+
+		auto dst_addr = BAN::IPv4Address(destination->sin_addr.s_addr);
+		auto dst_mac = TRY(NetworkManager::get().arp_table().get_mac_from_ipv4(*m_interface, dst_addr));
+
+		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(payload_offset + payload_size));
+
+		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, dst_port);
+		add_ipv4_header(packet_bytespan.slice(ipv4_header_offset), m_interface->get_ipv4_address(), dst_addr, protocol());
+		m_interface->add_interface_header(packet_bytespan.slice(interface_header_offset), dst_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));
+	}
+
+	BAN::ErrorOr<long> NetworkSocket::ioctl_impl(int request, void* arg)
+	{
+		if (!arg)
+		{
+			dprintln("No argument provided");
+			return BAN::Error::from_errno(EINVAL);
+		}
+		if (m_interface == nullptr)
+		{
+			dprintln("No interface bound");
+			return BAN::Error::from_errno(EADDRNOTAVAIL);
+		}
+
+		auto* ifreq = reinterpret_cast<struct ifreq*>(arg);
+
+		switch (request)
+		{
+			case SIOCGIFADDR:
+			{
+				auto ipv4_address = m_interface->get_ipv4_address();
+				ifreq->ifr_ifru.ifru_addr.sa_family = AF_INET;
+				memcpy(ifreq->ifr_ifru.ifru_addr.sa_data, &ipv4_address, sizeof(ipv4_address));
+				return 0;
+			}
+			case SIOCSIFADDR:
+			{
+				if (ifreq->ifr_ifru.ifru_addr.sa_family != AF_INET)
+					return BAN::Error::from_errno(EADDRNOTAVAIL);
+				BAN::IPv4Address ipv4_address { *reinterpret_cast<uint32_t*>(ifreq->ifr_ifru.ifru_addr.sa_data) };
+				m_interface->set_ipv4_address(ipv4_address);
+				dprintln("IPv4 address set to {}", m_interface->get_ipv4_address());
+				return 0;
+			}
+			case SIOCGIFNETMASK:
+			{
+				auto netmask_address = m_interface->get_netmask();
+				ifreq->ifr_ifru.ifru_netmask.sa_family = AF_INET;
+				memcpy(ifreq->ifr_ifru.ifru_netmask.sa_data, &netmask_address, sizeof(netmask_address));
+				return 0;
+			}
+			case SIOCSIFNETMASK:
+			{
+				if (ifreq->ifr_ifru.ifru_netmask.sa_family != AF_INET)
+					return BAN::Error::from_errno(EADDRNOTAVAIL);
+				BAN::IPv4Address netmask { *reinterpret_cast<uint32_t*>(ifreq->ifr_ifru.ifru_netmask.sa_data) };
+				m_interface->set_netmask(netmask);
+				dprintln("Netmask set to {}", m_interface->get_netmask());
+				return 0;
+			}
+			case SIOCGIFHWADDR:
+			{
+				auto mac_address = m_interface->get_mac_address();
+				ifreq->ifr_ifru.ifru_hwaddr.sa_family = AF_INET;
+				memcpy(ifreq->ifr_ifru.ifru_hwaddr.sa_data, &mac_address, sizeof(mac_address));
+				return 0;
+			}
+			default:
+				return BAN::Error::from_errno(EINVAL);
+		}
+	}
+
+}

kernel/kernel/Networking/UDPSocket.cpp

@@ -0,0 +1,101 @@
+#include <kernel/Memory/Heap.h>
+#include <kernel/Networking/UDPSocket.h>
+#include <kernel/Thread.h>
+
+namespace Kernel
+{
+
+	BAN::ErrorOr<BAN::RefPtr<UDPSocket>> UDPSocket::create(mode_t mode, uid_t uid, gid_t 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)
+	{ }
+
+	void UDPSocket::add_protocol_header(BAN::ByteSpan packet, uint16_t src_port, uint16_t dst_port)
+	{
+		auto& header = packet.as<UDPHeader>();
+		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 _;
+
+		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;
+	}
+
+}

kernel/kernel/OpenFileDescriptorSet.cpp

@@ -1,8 +1,10 @@
 #include <kernel/FS/Pipe.h>
 #include <kernel/FS/VirtualFileSystem.h>
+#include <kernel/Networking/NetworkManager.h>
 #include <kernel/OpenFileDescriptorSet.h>
 
 #include <fcntl.h>
+#include <sys/socket.h>
 
 namespace Kernel
 {
@@ -76,6 +78,38 @@ namespace Kernel
 		return fd;
 	}
 
+	BAN::ErrorOr<int> OpenFileDescriptorSet::socket(int domain, int type, int protocol)
+	{
+		using SocketType = NetworkManager::SocketType;
+
+		if (domain != AF_INET)
+			return BAN::Error::from_errno(EAFNOSUPPORT);
+		if (protocol != 0)
+			return BAN::Error::from_errno(EPROTONOSUPPORT);
+
+		SocketType sock_type;
+		switch (type)
+		{
+			case SOCK_STREAM:
+				sock_type = SocketType::STREAM;
+				break;
+			case SOCK_DGRAM:
+				sock_type = SocketType::DGRAM;
+				break;
+			case SOCK_SEQPACKET:
+				sock_type = SocketType::SEQPACKET;
+				break;
+			default:
+				return BAN::Error::from_errno(EPROTOTYPE);
+		}
+
+		auto socket = TRY(NetworkManager::get().create_socket(sock_type, 0777, m_credentials.euid(), m_credentials.egid()));
+
+		int fd = TRY(get_free_fd());
+		m_open_files[fd] = TRY(BAN::RefPtr<OpenFileDescription>::create(socket, "no-path"sv, 0, O_RDWR));
+		return fd;
+	}
+
 	BAN::ErrorOr<void> OpenFileDescriptorSet::pipe(int fds[2])
 	{
 		TRY(get_free_fd_pair(fds));
@@ -242,6 +276,8 @@ namespace Kernel
 		if (m_open_files[fd]->flags & O_WRONLY && m_open_files[fd]->inode->is_pipe())
 			((Pipe*)m_open_files[fd]->inode.ptr())->close_writing();
 
+		m_open_files[fd]->inode->on_close();
+
 		m_open_files[fd].clear();
 
 		return {};

kernel/kernel/PCI.cpp

@@ -2,7 +2,7 @@
 #include <kernel/IO.h>
 #include <kernel/Memory/PageTable.h>
 #include <kernel/MMIO.h>
-#include <kernel/Networking/E1000.h>
+#include <kernel/Networking/NetworkManager.h>
 #include <kernel/PCI.h>
 #include <kernel/Storage/ATA/AHCI/Controller.h>
 #include <kernel/Storage/ATA/ATAController.h>
@@ -183,17 +183,8 @@ namespace Kernel::PCI
 				}
 				case 0x02:
 				{
-					switch (pci_device.subclass())
-					{
-						case 0x00:
-							if (E1000::probe(pci_device))
-								if (auto res = E1000::create(pci_device); res.is_error())
-									dprintln("E1000: {}", res.error());
-							break;
-						default:
-							dprintln("unsupported ethernet device (pci {2H}.{2H}.{2H})", pci_device.class_code(), pci_device.subclass(), pci_device.prog_if());
-							break;
-					}
+					if (auto res = NetworkManager::get().add_interface(pci_device); res.is_error())
+						dprintln("{}", res.error());
 					break;
 				}
 				default:
@@ -259,7 +250,7 @@ namespace Kernel::PCI
 		device.write_word(PCI_REG_COMMAND, command);
 
 #if DEBUG_PCI
-		dprintln("created BAR region for PCI {}:{}.{}",
+		dprintln("created BAR region for PCI {2H}:{2H}.{2H}",
 			device.bus(),
 			device.dev(),
 			device.func()
@@ -493,12 +484,12 @@ namespace Kernel::PCI
 		return {};
 	}
 
-	static uint64_t msi_message_address()
+	static constexpr uint64_t msi_message_address()
 	{
 		return 0xFEE00000;
 	}
 
-	static uint32_t msi_message_data(uint8_t irq)
+	static constexpr uint32_t msi_message_data(uint8_t irq)
 	{
 		return (IRQ_VECTOR_BASE + irq) & 0xFF;
 	}

kernel/kernel/Process.cpp

@@ -895,6 +895,70 @@ namespace Kernel
 		return 0;
 	}
 
+	BAN::ErrorOr<long> Process::sys_socket(int domain, int type, int protocol)
+	{
+		LockGuard _(m_lock);
+		return TRY(m_open_file_descriptors.socket(domain, type, protocol));
+	}
+
+
+	BAN::ErrorOr<long> Process::sys_bind(int socket, const sockaddr* address, socklen_t address_len)
+	{
+		LockGuard _(m_lock);
+		TRY(validate_pointer_access(address, address_len));
+
+		auto inode = TRY(m_open_file_descriptors.inode_of(socket));
+		if (!inode->mode().ifsock())
+			return BAN::Error::from_errno(ENOTSOCK);
+
+		TRY(inode->bind(address, address_len));
+		return 0;
+	}
+
+	BAN::ErrorOr<long> Process::sys_sendto(const sys_sendto_t* arguments)
+	{
+		LockGuard _(m_lock);
+		TRY(validate_pointer_access(arguments, sizeof(sys_sendto_t)));
+		TRY(validate_pointer_access(arguments->message, arguments->length));
+		TRY(validate_pointer_access(arguments->dest_addr, arguments->dest_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->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_ioctl(int fildes, int request, void* arg)
+	{
+		LockGuard _(m_lock);
+		auto inode = TRY(m_open_file_descriptors.inode_of(fildes));
+		return TRY(inode->ioctl(request, arg));
+	}
+
 	BAN::ErrorOr<long> Process::sys_pipe(int fildes[2])
 	{
 		LockGuard _(m_lock);

kernel/kernel/Scheduler.cpp

@@ -5,7 +5,7 @@
 #include <kernel/InterruptController.h>
 #include <kernel/Process.h>
 #include <kernel/Scheduler.h>
-#include <kernel/Timer/PIT.h>
+#include <kernel/Timer/Timer.h>
 
 #define SCHEDULER_VERIFY_STACK 1
 #define SCHEDULER_VERIFY_INTERRUPT_STATE 1
@@ -116,12 +116,11 @@ namespace Kernel
 		uint64_t current_time = SystemTimer::get().ms_since_boot();
 		while (!m_sleeping_threads.empty() && m_sleeping_threads.front().wake_time <= current_time)
 		{
-			Thread* thread = m_sleeping_threads.front().thread;
-			m_sleeping_threads.remove(m_sleeping_threads.begin());
-
-			// This should work as we released enough memory from sleeping thread
-			static_assert(sizeof(ActiveThread) == sizeof(SleepingThread));
-			MUST(m_active_threads.emplace_back(thread));
+			m_sleeping_threads.move_element_to_other_linked_list(
+				m_active_threads,
+				m_active_threads.end(),
+				m_sleeping_threads.begin()
+			);
 		}
 	}
 
@@ -286,23 +285,26 @@ namespace Kernel
 
 		ASSERT(m_current_thread);
 
-		Thread* sleeping = m_current_thread->thread;
-
 		if (save_current_thread())
 		{
 			ENABLE_INTERRUPTS();
 			return;
 		}
-		remove_and_advance_current_thread();
 
 		auto it = m_sleeping_threads.begin();
 		for (; it != m_sleeping_threads.end(); it++)
 			if (wake_time <= it->wake_time)
 				break;
 
-		// This should work as we released enough memory from active thread
-		static_assert(sizeof(ActiveThread) == sizeof(SleepingThread));
-		MUST(m_sleeping_threads.emplace(it, sleeping, wake_time));
+		m_current_thread->wake_time = wake_time;
+		m_active_threads.move_element_to_other_linked_list(
+			m_sleeping_threads,
+			it,
+			m_current_thread
+		);
+
+		m_current_thread = {};
+		advance_current_thread();
 
 		execute_current_thread();
 		ASSERT_NOT_REACHED();
@@ -315,18 +317,21 @@ namespace Kernel
 
 		ASSERT(m_current_thread);
 
-		Thread* blocking = m_current_thread->thread;
-
 		if (save_current_thread())
 		{
 			ENABLE_INTERRUPTS();
 			return;
 		}
-		remove_and_advance_current_thread();
 
-		// This should work as we released enough memory from active thread
-		static_assert(sizeof(ActiveThread) == sizeof(BlockingThread));
-		MUST(m_blocking_threads.emplace_back(blocking, semaphore));
+		m_current_thread->semaphore = semaphore;
+		m_active_threads.move_element_to_other_linked_list(
+			m_blocking_threads,
+			m_blocking_threads.end(),
+			m_current_thread
+		);
+
+		m_current_thread = {};
+		advance_current_thread();
 
 		execute_current_thread();
 		ASSERT_NOT_REACHED();
@@ -340,12 +345,11 @@ namespace Kernel
 		{
 			if (it->semaphore == semaphore)
 			{
-				auto thread = it->thread;
-				it = m_blocking_threads.remove(it);
-
-				// This should work as we released enough memory from active thread
-				static_assert(sizeof(ActiveThread) == sizeof(BlockingThread));
-				MUST(m_active_threads.emplace_back(thread));
+				it = m_blocking_threads.move_element_to_other_linked_list(
+					m_active_threads,
+					m_active_threads.end(),
+					it
+				);
 			}
 			else
 			{
@@ -362,13 +366,11 @@ namespace Kernel
 		{
 			if (it->thread->tid() == tid)
 			{
-				Thread* thread = it->thread;
-				m_blocking_threads.remove(it);
-
-				// This should work as we released enough memory from active thread
-				static_assert(sizeof(ActiveThread) == sizeof(BlockingThread));
-				MUST(m_active_threads.emplace_back(thread));
-
+				m_blocking_threads.move_element_to_other_linked_list(
+					m_active_threads,
+					m_active_threads.end(),
+					it
+				);
 				return;
 			}
 		}
@@ -377,13 +379,11 @@ namespace Kernel
 		{
 			if (it->thread->tid() == tid)
 			{
-				Thread* thread = it->thread;
-				m_sleeping_threads.remove(it);
-
-				// This should work as we released enough memory from active thread
-				static_assert(sizeof(ActiveThread) == sizeof(BlockingThread));
-				MUST(m_active_threads.emplace_back(thread));
-
+				m_sleeping_threads.move_element_to_other_linked_list(
+					m_active_threads,
+					m_active_threads.end(),
+					it
+				);
 				return;
 			}
 		}

kernel/kernel/Syscall.cpp

@@ -213,6 +213,21 @@ namespace Kernel
 		case SYS_LOAD_KEYMAP:
 			ret = Process::current().sys_load_keymap((const char*)arg1);
 			break;
+		case SYS_SOCKET:
+			ret = Process::current().sys_socket((int)arg1, (int)arg2, (int)arg3);
+			break;
+		case SYS_BIND:
+			ret = Process::current().sys_bind((int)arg1, (const sockaddr*)arg2, (socklen_t)arg3);
+			break;
+		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;
+		case SYS_IOCTL:
+			ret = Process::current().sys_ioctl((int)arg1, (int)arg2, (void*)arg3);
+			break;
 		default:
 			dwarnln("Unknown syscall {}", syscall);
 			break;

kernel/kernel/kernel.cpp

@@ -15,6 +15,7 @@
 #include <kernel/Memory/Heap.h>
 #include <kernel/Memory/kmalloc.h>
 #include <kernel/Memory/PageTable.h>
+#include <kernel/Networking/NetworkManager.h>
 #include <kernel/PCI.h>
 #include <kernel/PIC.h>
 #include <kernel/Process.h>
@@ -187,6 +188,8 @@ static void init2(void*)
 	if (auto res = PS2Controller::initialize(); res.is_error())
 		dprintln("{}", res.error());
 
+	MUST(NetworkManager::initialize());
+
 	// NOTE: PCI devices are the last ones to be initialized
 	//       so other devices can reserve predefined interrupts
 	PCI::PCIManager::initialize();

libc/CMakeLists.txt

@@ -17,8 +17,10 @@ set(LIBC_SOURCES
 	stdlib.cpp
 	string.cpp
 	strings.cpp
+	stropts.cpp
 	sys/banan-os.cpp
 	sys/mman.cpp
+	sys/socket.cpp
 	sys/stat.cpp
 	sys/wait.cpp
 	termios.cpp

libc/include/net/if.h

@@ -5,6 +5,8 @@
 
 #include <sys/cdefs.h>
 
+#include <sys/socket.h>
+
 #define IF_NAMESIZE 16
 
 __BEGIN_DECLS
@@ -15,6 +17,22 @@ struct if_nameindex
 	char* if_name;		/* Null-terminated name of the interface. */
 };
 
+struct ifreq
+{
+	union {
+		struct sockaddr ifru_addr;
+		struct sockaddr ifru_netmask;
+		struct sockaddr ifru_hwaddr;
+		unsigned char __min_storage[sizeof(sockaddr) + 6];
+	} ifr_ifru;
+};
+
+#define SIOCGIFADDR		1	/* Get interface address */
+#define SIOCSIFADDR		2	/* Set interface address */
+#define SIOCGIFNETMASK	3	/* Get network mask */
+#define SIOCSIFNETMASK	4	/* Set network mask */
+#define SIOCGIFHWADDR	5	/* Get hardware address */
+
 void					if_freenameindex(struct if_nameindex* ptr);
 char*					if_indextoname(unsigned ifindex, char* ifname);
 struct if_nameindex*	if_nameindex(void);

libc/include/stropts.h

@@ -0,0 +1,153 @@
+#ifndef _STROPTS_H
+#define _STROPTS_H 1
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stropts.h.html
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define __need_uid_t
+#define __need_gid_t
+#include <sys/types.h>
+
+typedef __UINT32_TYPE__ t_uscalar_t;
+typedef __INT32_TYPE__ t_scalar_t;
+
+struct bandinfo
+{
+	int				bi_flag;	/* Flushing type. */
+	unsigned char	bi_pri;		/* Priority band. */
+};
+
+struct strbuf
+{
+	char*	buf;	/* Pointer to buffer. */
+	int		len;	/* Length of data. */
+	int		maxlen;	/* Maximum buffer length. */
+};
+
+struct strpeek
+{
+	struct strbuf	ctlbuf;		/* The control portion of the message. */
+	struct strbuf	databuf;	/* The data portion of the message. */
+	t_uscalar_t		flags;		/* RS_HIPRI or 0. */
+};
+
+struct strfdinsert
+{
+	struct strbuf	ctlbuf;		/* The control portion of the message. */
+	struct strbuf	databuf;	/* The data portion of the message. */
+	int				fildes;		/* File descriptor of the other STREAM. */
+	t_uscalar_t		flags;		/* RS_HIPRI or 0. */
+	int				offset;		/* Relative location of the stored value. */
+};
+
+struct strioctl
+{
+	int		ic_cmd;		/* ioctl() command. */
+	char*	ic_dp;		/* Pointer to buffer. */
+	int		ic_len;		/* Length of data. */
+	int		ic_timout;	/* Timeout for response. */
+};
+
+struct strrecvfd
+{
+	int		fd;		/* Received file descriptor. */
+	gid_t	gid;	/* GID of sender. */
+	uid_t	uid;	/* UID of sender. */
+};
+
+#define FMNAMESZ 128
+
+struct str_mlist
+{
+	char	l_name[FMNAMESZ+1];	/* A STREAMS module name. */
+};
+
+struct str_list
+{
+	struct str_mlist*	sl_modlist;	/* STREAMS module names. */
+	int					sl_nmods;	/* Number of STREAMS module names. */
+};
+
+#define I_ATMARK	1
+#define I_CANPUT	2
+#define I_CKBAND	3
+#define I_FDINSERT	4
+#define I_FIND		5
+#define I_FLUSH		6
+#define I_FLUSHBAND	7
+#define I_GETBAND	8
+#define I_GETCLTIME	9
+#define I_GETSIG	10
+#define I_GRDOPT	11
+#define I_GWROPT	12
+#define I_LINK		13
+#define I_LIST		14
+#define I_LOOK		15
+#define I_NREAD		16
+#define I_PEEK		17
+#define I_PLINK		18
+#define I_POP		19
+#define I_PUNLINK	20
+#define I_PUSH		21
+#define I_RECVFD	22
+#define I_SENDFD	23
+#define I_SETCLTIME	24
+#define I_SETSIG	25
+#define I_SRDOPT	26
+#define I_STR		27
+#define I_SWROPT	28
+#define I_UNLINK	29
+
+#define FLUSHR	1
+#define FLUSHRW	2
+#define FLUSHW	3
+
+#define S_BANDURG	1
+#define S_ERROR		2
+#define S_HANGUP	3
+#define S_HIPRI		4
+#define S_INPUT		5
+#define S_MSG		6
+#define S_OUTPUT	7
+#define S_RDBAND	8
+#define S_RDNORM	9
+#define S_WRBAND	10
+#define S_WRNORM	11
+
+#define RS_HIPRI 1
+
+#define RMSGD		1
+#define RMSGN		2
+#define RNORM		3
+#define RPROTDAT	4
+#define RPROTDIS	5
+#define RPROTNORM	6
+
+#define SNDZERO 1
+
+#define ANYMARK		1
+#define LASTMARK	2
+
+#define MUXID_ALL 1
+
+#define MORECTL		1
+#define MOREDATA	2
+#define MSG_ANY		3
+#define MSG_BAND	4
+#define MSG_HIPRI	5
+
+int fattach(int, const char*);
+int fdetach(const char*);
+int getmsg(int, struct strbuf* __restrict, struct strbuf* __restrict, int* __restrict);
+int getpmsg(int, struct strbuf* __restrict, struct strbuf* __restrict, int* __restrict, int* __restrict);
+int ioctl(int, int, ...);
+int isastream(int);
+int putmsg(int, const struct strbuf*, const struct strbuf*, int);
+int putpmsg(int, const struct strbuf*, const struct strbuf*, int, int);
+
+__END_DECLS
+
+#endif

libc/include/sys/socket.h

@@ -105,6 +105,26 @@ struct linger
 #define SHUT_WR		0x02
 #define SHUT_RDWR	(SHUT_RD | SHUT_WR)
 
+struct sys_sendto_t
+{
+	int socket;
+	const void* message;
+	size_t length;
+	int flags;
+	const struct sockaddr* dest_addr;
+	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);

libc/include/sys/syscall.h

@@ -63,6 +63,11 @@ __BEGIN_DECLS
 #define SYS_PREAD 62
 #define SYS_CHOWN 63
 #define SYS_LOAD_KEYMAP 64
+#define SYS_SOCKET 65
+#define SYS_BIND 66
+#define SYS_SENDTO 67
+#define SYS_RECVFROM 68
+#define SYS_IOCTL 69
 
 __END_DECLS
 

libc/stropts.cpp

@@ -0,0 +1,14 @@
+#include <stdarg.h>
+#include <stropts.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+int ioctl(int fildes, int request, ...)
+{
+	va_list args;
+	va_start(args, request);
+	void* extra = va_arg(args, void*);
+	va_end(args);
+
+	return syscall(SYS_IOCTL, fildes, request, extra);
+}

libc/sys/socket.cpp

@@ -0,0 +1,40 @@
+#include <sys/socket.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+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 {
+		.socket = socket,
+		.message = message,
+		.length = length,
+		.flags = flags,
+		.dest_addr = dest_addr,
+		.dest_len = dest_len
+	};
+	return syscall(SYS_SENDTO, &arguments);
+}
+
+int socket(int domain, int type, int protocol)
+{
+	return syscall(SYS_SOCKET, domain, type, protocol);
+}

script/qemu.sh

@@ -20,9 +20,11 @@ else
 fi
 
 qemu-system-$BANAN_ARCH												\
-	-m 128															\
+	-m 1G															\
 	-smp 2															\
 	$BIOS_ARGS														\
 	-drive format=raw,id=disk,file=${BANAN_DISK_IMAGE_PATH},if=none	\
+	-device e1000e,netdev=net										\
+	-netdev user,id=net												\
 	$DISK_ARGS														\
 	$@																\

userspace/CMakeLists.txt

@@ -8,6 +8,7 @@ set(USERSPACE_PROJECTS
 	chmod
 	cp
 	dd
+	dhcp-client
 	echo
 	id
 	init

userspace/dhcp-client/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(dhcp-client CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable(dhcp-client ${SOURCES})
+target_compile_options(dhcp-client PUBLIC -O2 -g)
+target_link_libraries(dhcp-client PUBLIC libc)
+
+add_custom_target(dhcp-client-install
+	COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/dhcp-client ${BANAN_BIN}/
+	DEPENDS dhcp-client
+)

userspace/dhcp-client/main.cpp

@@ -0,0 +1,380 @@
+#include <BAN/Endianness.h>
+#include <BAN/IPv4.h>
+#include <BAN/MAC.h>
+#include <BAN/Vector.h>
+
+#include <fcntl.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stropts.h>
+#include <sys/socket.h>
+
+#define DEBUG_DHCP 0
+
+struct DHCPPacket
+{
+	uint8_t							op;
+	uint8_t							htype	{ 0x01 };
+	uint8_t							hlen	{ 0x06 };
+	uint8_t							hops	{ 0x00 };
+	BAN::NetworkEndian<uint32_t>	xid		{ 0x3903F326 };
+	BAN::NetworkEndian<uint16_t>	secs	{ 0x0000 };
+	BAN::NetworkEndian<uint16_t>	flags	{ 0x0000 };
+	BAN::NetworkEndian<uint32_t>	ciaddr	{ 0 };
+	BAN::NetworkEndian<uint32_t>	yiaddr	{ 0 };
+	BAN::NetworkEndian<uint32_t>	siaddr	{ 0 };
+	BAN::NetworkEndian<uint32_t>	giaddr	{ 0 };
+	BAN::MACAddress					chaddr;
+	uint8_t							padding[10] {};
+	uint8_t							legacy[192] {};
+	BAN::NetworkEndian<uint32_t>	magic_cookie	{ 0x63825363 };
+	uint8_t 						options[0x100];
+};
+static_assert(offsetof(DHCPPacket, options) == 240);
+
+enum DHCPType
+{
+	SubnetMask = 1,
+	Router = 3,
+	DomainNameServer = 6,
+	RequestedIPv4Address= 50,
+	DHCPMessageType = 53,
+	ServerIdentifier = 54,
+	ParameterRequestList = 55,
+	End = 255,
+};
+
+enum DHCPMessageType
+{
+	INVALID = 0,
+	DHCPDISCOVER = 1,
+	DHCPOFFER = 2,
+	DHCPREQUEST = 3,
+	DHCPDECLINE = 4,
+	DHCPACK = 5,
+};
+
+BAN::MACAddress get_mac_address(int socket)
+{
+	ifreq ifreq;
+	if (ioctl(socket, SIOCGIFHWADDR, &ifreq) == -1)
+	{
+		perror("ioctl");
+		exit(1);
+	}
+
+	BAN::MACAddress mac_address;
+	memcpy(&mac_address, ifreq.ifr_ifru.ifru_hwaddr.sa_data, sizeof(mac_address));
+	return mac_address;
+}
+
+void update_ipv4_info(int socket, BAN::IPv4Address address, BAN::IPv4Address subnet)
+{
+	{
+		ifreq ifreq;
+		ifreq.ifr_ifru.ifru_addr.sa_family = AF_INET;
+		*(uint32_t*)ifreq.ifr_ifru.ifru_addr.sa_data = address.as_u32();
+		if (ioctl(socket, SIOCSIFADDR, &ifreq) == -1)
+		{
+			perror("ioctl");
+			exit(1);
+		}
+	}
+
+	{
+		ifreq ifreq;
+		ifreq.ifr_ifru.ifru_netmask.sa_family = AF_INET;
+		*(uint32_t*)ifreq.ifr_ifru.ifru_netmask.sa_data = subnet.as_u32();
+		if (ioctl(socket, SIOCSIFNETMASK, &ifreq) == -1)
+		{
+			perror("ioctl");
+			exit(1);
+		}
+	}
+}
+
+void send_dhcp_packet(int socket, const DHCPPacket& dhcp_packet, BAN::IPv4Address server_ipv4)
+{
+	sockaddr_in server_addr;
+	server_addr.sin_family = AF_INET;
+	server_addr.sin_port = 67;
+	server_addr.sin_addr.s_addr = server_ipv4.as_u32();;
+
+	if (sendto(socket, &dhcp_packet, sizeof(DHCPPacket), 0, (sockaddr*)&server_addr, sizeof(server_addr)) == -1)
+	{
+		perror("sendto");
+		exit(1);
+	}
+}
+
+void send_dhcp_discover(int socket, BAN::MACAddress mac_address)
+{
+	DHCPPacket dhcp_packet;
+	dhcp_packet.op = 0x01;
+	dhcp_packet.chaddr = mac_address;
+
+	size_t idx = 0;
+
+	dhcp_packet.options[idx++] = DHCPMessageType;
+	dhcp_packet.options[idx++] = 0x01;
+	dhcp_packet.options[idx++] = DHCPDISCOVER;
+
+	dhcp_packet.options[idx++] = ParameterRequestList;
+	dhcp_packet.options[idx++] = 0x03;
+	dhcp_packet.options[idx++] = DomainNameServer;
+	dhcp_packet.options[idx++] = SubnetMask;
+	dhcp_packet.options[idx++] = Router;
+
+	dhcp_packet.options[idx++] = 0xFF;
+
+	send_dhcp_packet(socket, dhcp_packet, BAN::IPv4Address { 0xFFFFFFFF });
+}
+
+void send_dhcp_request(int socket, BAN::MACAddress mac_address, BAN::IPv4Address offered_ipv4, BAN::IPv4Address server_ipv4)
+{
+	DHCPPacket dhcp_packet;
+	dhcp_packet.op = 0x01;
+	dhcp_packet.siaddr = server_ipv4.as_u32();
+	dhcp_packet.chaddr = mac_address;
+
+	size_t idx = 0;
+
+	dhcp_packet.options[idx++] = DHCPMessageType;
+	dhcp_packet.options[idx++] = 0x01;
+	dhcp_packet.options[idx++] = DHCPREQUEST;
+
+	dhcp_packet.options[idx++] = RequestedIPv4Address;
+	dhcp_packet.options[idx++] = 0x04;
+	dhcp_packet.options[idx++] = offered_ipv4.address[0];
+	dhcp_packet.options[idx++] = offered_ipv4.address[1];
+	dhcp_packet.options[idx++] = offered_ipv4.address[2];
+	dhcp_packet.options[idx++] = offered_ipv4.address[3];
+
+	dhcp_packet.options[idx++] = 0xFF;
+
+	send_dhcp_packet(socket, dhcp_packet, BAN::IPv4Address { 0xFFFFFFFF });
+}
+
+struct DHCPPacketInfo
+{
+	enum DHCPMessageType message_type	{ INVALID };
+	BAN::IPv4Address address			{ 0 };
+	BAN::IPv4Address subnet				{ 0 };
+	BAN::IPv4Address server				{ 0 };
+	BAN::Vector<BAN::IPv4Address> routers;
+	BAN::Vector<BAN::IPv4Address> dns;
+};
+
+DHCPPacketInfo parse_dhcp_packet(const DHCPPacket& packet)
+{
+	DHCPPacketInfo packet_info;
+	packet_info.address = BAN::IPv4Address(packet.yiaddr);
+
+	const uint8_t* options = packet.options;
+	while (*options != End)
+	{
+		uint8_t type = *options++;
+		uint8_t length = *options++;
+
+		switch (type)
+		{
+			case SubnetMask:
+			{
+				if (length != 4)
+				{
+					fprintf(stderr, "Subnet mask with invalid length %hhu\n", length);
+					break;
+				}
+				uint32_t raw = *reinterpret_cast<const BAN::NetworkEndian<uint32_t>*>(options);
+				packet_info.subnet = BAN::IPv4Address(raw);
+				break;
+			}
+			case Router:
+			{
+				if (length % 4 != 0)
+				{
+					fprintf(stderr, "Router with invalid length %hhu\n", length);
+					break;
+				}
+				for (int i = 0; i < length; i += 4)
+				{
+					uint32_t raw = *reinterpret_cast<const BAN::NetworkEndian<uint32_t>*>(options + i);
+					MUST(packet_info.routers.emplace_back(raw));
+				}
+				break;
+			}
+			case DomainNameServer:
+			{
+				if (length % 4 != 0)
+				{
+					fprintf(stderr, "DNS with invalid length %hhu\n", length);
+					break;
+				}
+				for (int i = 0; i < length; i += 4)
+				{
+					uint32_t raw = *reinterpret_cast<const BAN::NetworkEndian<uint32_t>*>(options + i);
+					MUST(packet_info.dns.emplace_back(raw));
+				}
+				break;
+			}
+			case DHCPMessageType:
+			{
+				if (length != 1)
+				{
+					fprintf(stderr, "DHCP Message Type with invalid length %hhu\n", length);
+					break;
+				}
+				switch (*options)
+				{
+					case DHCPDISCOVER:	packet_info.message_type = DHCPDISCOVER;	break;
+					case DHCPOFFER:		packet_info.message_type = DHCPOFFER;		break;
+					case DHCPREQUEST:	packet_info.message_type = DHCPREQUEST;		break;
+					case DHCPDECLINE:	packet_info.message_type = DHCPDECLINE;		break;
+					case DHCPACK:		packet_info.message_type = DHCPACK;			break;
+				}
+				break;
+			}
+			case ServerIdentifier:
+			{
+				if (length != 4)
+				{
+					fprintf(stderr, "Server identifier with invalid length %hhu\n", length);
+					break;
+				}
+				uint32_t raw = *reinterpret_cast<const BAN::NetworkEndian<uint32_t>*>(options);
+				packet_info.server = BAN::IPv4Address(raw);
+				break;
+			}
+		}
+
+		options += length;
+	}
+
+	return packet_info;
+}
+
+BAN::Optional<DHCPPacketInfo> read_dhcp_packet(int socket)
+{
+	DHCPPacket dhcp_packet;
+
+	ssize_t nrecv = recvfrom(socket, &dhcp_packet, sizeof(dhcp_packet), 0, nullptr, nullptr);
+	if (nrecv == -1)
+	{
+		perror("revcfrom");
+		return {};
+	}
+
+	if (nrecv <= (ssize_t)offsetof(DHCPPacket, options))
+	{
+		fprintf(stderr, "invalid DHCP offer\n");
+		return {};
+	}
+
+	if (dhcp_packet.magic_cookie != 0x63825363)
+	{
+		fprintf(stderr, "invalid DHCP offer\n");
+		return {};
+	}
+
+	return parse_dhcp_packet(dhcp_packet);
+}
+
+int main()
+{
+	int socket = ::socket(AF_INET, SOCK_DGRAM, 0);
+	if (socket == -1)
+	{
+		perror("socket");
+		return 1;
+	}
+
+	sockaddr_in client_addr;
+	client_addr.sin_family = AF_INET;
+	client_addr.sin_port = 68;
+	client_addr.sin_addr.s_addr = 0x00000000;
+
+	if (bind(socket, (sockaddr*)&client_addr, sizeof(client_addr)) == -1)
+	{
+		perror("bind");
+		return 1;
+	}
+
+	auto mac_address = get_mac_address(socket);
+#if DEBUG_DHCP
+	BAN::Formatter::println(putchar, "MAC: {}", mac_address);
+#endif
+
+	send_dhcp_discover(socket, mac_address);
+#if DEBUG_DHCP
+	printf("DHCPDISCOVER sent\n");
+#endif
+
+	auto dhcp_offer = read_dhcp_packet(socket);
+	if (!dhcp_offer.has_value())
+		return 1;
+	if (dhcp_offer->message_type != DHCPOFFER)
+	{
+		fprintf(stderr, "DHCP server did not respond with DHCPOFFER\n");
+		return 1;
+	}
+
+#if DEBUG_DHCP
+	BAN::Formatter::println(putchar, "DHCPOFFER");
+	BAN::Formatter::println(putchar, "  IP     {}", dhcp_offer->address);
+	BAN::Formatter::println(putchar, "  SUBNET {}", dhcp_offer->subnet);
+	BAN::Formatter::println(putchar, "  SERVER {}", dhcp_offer->server);
+#endif
+
+	send_dhcp_request(socket, mac_address, dhcp_offer->address, dhcp_offer->server);
+#if DEBUG_DHCP
+	printf("DHCPREQUEST sent\n");
+#endif
+
+	auto dhcp_ack = read_dhcp_packet(socket);
+	if (!dhcp_ack.has_value())
+		return 1;
+	if (dhcp_ack->message_type != DHCPACK)
+	{
+		fprintf(stderr, "DHCP server did not respond with DHCPACK\n");
+		return 1;
+	}
+
+#if DEBUG_DHCP
+	BAN::Formatter::println(putchar, "DHCPACK");
+	BAN::Formatter::println(putchar, "  IP     {}", dhcp_ack->address);
+	BAN::Formatter::println(putchar, "  SUBNET {}", dhcp_ack->subnet);
+	BAN::Formatter::println(putchar, "  SERVER {}", dhcp_ack->server);
+#endif
+
+	if (dhcp_offer->address != dhcp_ack->address)
+	{
+		fprintf(stderr, "DHCP server OFFER and ACK ips don't match\n");
+		return 1;
+	}
+
+	update_ipv4_info(socket, dhcp_ack->address, dhcp_ack->subnet);
+
+	if (true)
+	{
+		uint32_t packet = 0x12345678;
+
+		sockaddr_in server_addr;
+		server_addr.sin_family = AF_INET;
+		server_addr.sin_port = 67;
+		server_addr.sin_addr.s_addr = dhcp_ack->routers.front().as_u32();
+		server_addr.sin_addr.s_addr = (192 << 24) | (168 << 16) | (1 << 8) | 203;
+
+		if (sendto(socket, &packet, sizeof(packet), 0, (sockaddr*)&server_addr, sizeof(server_addr)) == -1)
+		{
+			perror("sendto");
+			exit(1);
+		}
+	}
+
+	close(socket);
+
+	return 0;
+}

userspace/init/main.cpp

@@ -29,6 +29,12 @@ int main()
 	if (load_keymap("/usr/share/keymaps/fi.keymap") == -1)
 		perror("load_keymap");
 
+	if (fork() == 0)
+	{
+		execl("/bin/dhcp-client", "dhcp-client", NULL);
+		exit(1);
+	}
+
 	bool first = true;
 
 	termios termios;

userspace/test-sort/main.cpp

@@ -16,26 +16,37 @@ bool is_sorted(BAN::Vector<T>& vec)
 
 #define CURRENT_NS() ({ timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); ts.tv_sec * 1'000'000'000 + ts.tv_nsec; })
 
-#define TEST(name, function, count) do {												\
-		BAN::Vector<int> ivec(count, 0);												\
-		for (int& i : ivec)																\
-			i = rand() % 100;															\
+#define TEST_ALGORITHM(ms, function) do {								\
+		uint64_t duration_us = 0;										\
+		printf(#function "\n");											\
+		for (size_t size = 100; duration_us < ms * 1000; size *= 10) {	\
+			BAN::Vector<unsigned> data(size, 0);						\
+			for (auto& val : data)										\
+				val = rand() % 100;										\
 			uint64_t start_ns = CURRENT_NS();							\
-		function(ivec.begin(), ivec.end());												\
-		uint64_t end_ns = CURRENT_NS();													\
-		uint64_t dur_us = (end_ns - start_ns) / 1000;									\
-		printf(name " (" #count "): %s\n", is_sorted(ivec) ? "success" : "fail");		\
-		printf("  took %" PRIu64 ".%03" PRIu64 " ms\n", dur_us / 1000, dur_us % 1000);	\
+			(void)function(data.begin(), data.end());					\
+			uint64_t stop_ns = CURRENT_NS();							\
+			if (!is_sorted(data)) {										\
+				printf("  \e[31mFAILED!\e[m\n");						\
+				break;													\
+			}															\
+			duration_us = (stop_ns - start_ns) / 1'000;					\
+			printf("  %5d.%03d ms (%zu)\n",								\
+				(int)(duration_us / 1000),								\
+				(int)(duration_us % 1000),								\
+				size													\
+			);															\
+		}																\
 	} while (0)
 
 int main()
 {
 	srand(time(0));
-	TEST("exchange sort", BAN::sort::exchange_sort, 100);
-	TEST("exchange sort", BAN::sort::exchange_sort, 1000);
-	TEST("exchange sort", BAN::sort::exchange_sort, 10000);
-
-	TEST("quick sort", BAN::sort::quick_sort, 100);
-	TEST("quick sort", BAN::sort::quick_sort, 1000);
-	TEST("quick sort", BAN::sort::quick_sort, 10000);
+	TEST_ALGORITHM(100,  BAN::sort::exchange_sort);
+	TEST_ALGORITHM(100,  BAN::sort::quick_sort);
+	TEST_ALGORITHM(100,  BAN::sort::insertion_sort);
+	TEST_ALGORITHM(100,  BAN::sort::heap_sort);
+	TEST_ALGORITHM(100,  BAN::sort::intro_sort);
+	TEST_ALGORITHM(1000, BAN::sort::sort);
+	TEST_ALGORITHM(1000, BAN::sort::radix_sort);
 }