Kernel/LibC: Implement basic ioctl for network addresses

kernel/include/kernel/FS/Inode.h

@@ -112,6 +112,8 @@ 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() {}
 
@@ -138,6 +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/NetworkInterface.h

@@ -11,6 +11,9 @@ namespace Kernel
 
 	class NetworkInterface : public CharacterDevice
 	{
+		BAN_NON_COPYABLE(NetworkInterface);
+		BAN_NON_MOVABLE(NetworkInterface);
+
 	public:
 		enum class Type
 		{
@@ -22,7 +25,12 @@ namespace Kernel
 		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;
@@ -42,6 +50,7 @@ namespace Kernel
 		char m_name[10];
 
 		BAN::IPv4Address m_ipv4_address { 0 };
+		BAN::IPv4Address m_netmask { 0 };
 	};
 
 }

kernel/include/kernel/Networking/NetworkSocket.h

@@ -35,6 +35,8 @@ namespace Kernel
 		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/Process.h

@@ -117,6 +117,8 @@ namespace Kernel
 		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/kernel/FS/Inode.cpp

@@ -183,4 +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/NetworkSocket.cpp

@@ -2,6 +2,8 @@
 #include <kernel/Networking/NetworkManager.h>
 #include <kernel/Networking/NetworkSocket.h>
 
+#include <net/if.h>
+
 namespace Kernel
 {
 
@@ -123,4 +125,65 @@ namespace Kernel
 		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/Process.cpp

@@ -952,6 +952,13 @@ namespace Kernel
 		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/Syscall.cpp

@@ -225,6 +225,9 @@ namespace Kernel
 		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;