diff --git a/Kernel/Net/IPv4Socket.cpp b/Kernel/Net/IPv4Socket.cpp
index fb0a19052a..17d1e07300 100644
--- a/Kernel/Net/IPv4Socket.cpp
+++ b/Kernel/Net/IPv4Socket.cpp
@@ -774,7 +774,15 @@ ErrorOr<void> IPv4Socket::ioctl(OpenFileDescription&, unsigned request, Userspac
         return ioctl_arp();
 
     case FIONREAD: {
-        int readable = m_receive_buffer->immediately_readable();
+        int readable = 0;
+        if (buffer_mode() == BufferMode::Bytes) {
+            readable = static_cast<int>(m_receive_buffer->immediately_readable());
+        } else {
+            if (m_receive_queue.size() != 0u) {
+                readable = static_cast<int>(TRY(protocol_size(m_receive_queue.first().data->bytes())));
+            }
+        }
+
         return copy_to_user(static_ptr_cast<int*>(arg), &readable);
     }
     }
diff --git a/Kernel/Net/IPv4Socket.h b/Kernel/Net/IPv4Socket.h
index 6f1addbc2f..b9bcbf6821 100644
--- a/Kernel/Net/IPv4Socket.h
+++ b/Kernel/Net/IPv4Socket.h
@@ -84,6 +84,7 @@ protected:
     virtual ErrorOr<size_t> protocol_send(const UserOrKernelBuffer&, size_t) { return ENOTIMPL; }
     virtual ErrorOr<void> protocol_connect(OpenFileDescription&, ShouldBlock) { return {}; }
     virtual ErrorOr<u16> protocol_allocate_local_port() { return ENOPROTOOPT; }
+    virtual ErrorOr<size_t> protocol_size(ReadonlyBytes /* raw_ipv4_packet */) { return ENOTIMPL; }
     virtual bool protocol_is_disconnected() const { return false; }
 
     virtual void shut_down_for_reading() override;
diff --git a/Kernel/Net/TCPSocket.cpp b/Kernel/Net/TCPSocket.cpp
index b3091b85b5..fa7eb8cc10 100644
--- a/Kernel/Net/TCPSocket.cpp
+++ b/Kernel/Net/TCPSocket.cpp
@@ -161,6 +161,13 @@ ErrorOr<NonnullRefPtr<TCPSocket>> TCPSocket::try_create(int protocol, NonnullOwn
     return adopt_nonnull_ref_or_enomem(new (nothrow) TCPSocket(protocol, move(receive_buffer), move(scratch_buffer)));
 }
 
+ErrorOr<size_t> TCPSocket::protocol_size(ReadonlyBytes raw_ipv4_packet)
+{
+    auto& ipv4_packet = *reinterpret_cast<const IPv4Packet*>(raw_ipv4_packet.data());
+    auto& tcp_packet = *static_cast<const TCPPacket*>(ipv4_packet.payload());
+    return raw_ipv4_packet.size() - sizeof(IPv4Packet) - tcp_packet.header_size();
+}
+
 ErrorOr<size_t> TCPSocket::protocol_receive(ReadonlyBytes raw_ipv4_packet, UserOrKernelBuffer& buffer, size_t buffer_size, [[maybe_unused]] int flags)
 {
     auto& ipv4_packet = *reinterpret_cast<const IPv4Packet*>(raw_ipv4_packet.data());
diff --git a/Kernel/Net/TCPSocket.h b/Kernel/Net/TCPSocket.h
index b8c60c3fd6..4cf0f32296 100644
--- a/Kernel/Net/TCPSocket.h
+++ b/Kernel/Net/TCPSocket.h
@@ -174,6 +174,7 @@ private:
     virtual ErrorOr<size_t> protocol_send(const UserOrKernelBuffer&, size_t) override;
     virtual ErrorOr<void> protocol_connect(OpenFileDescription&, ShouldBlock) override;
     virtual ErrorOr<u16> protocol_allocate_local_port() override;
+    virtual ErrorOr<size_t> protocol_size(ReadonlyBytes raw_ipv4_packet) override;
     virtual bool protocol_is_disconnected() const override;
     virtual ErrorOr<void> protocol_bind() override;
     virtual ErrorOr<void> protocol_listen(bool did_allocate_port) override;
diff --git a/Kernel/Net/UDPSocket.cpp b/Kernel/Net/UDPSocket.cpp
index 0a6b4eb7f8..691cc5dd49 100644
--- a/Kernel/Net/UDPSocket.cpp
+++ b/Kernel/Net/UDPSocket.cpp
@@ -59,6 +59,13 @@ ErrorOr<NonnullRefPtr<UDPSocket>> UDPSocket::try_create(int protocol, NonnullOwn
     return adopt_nonnull_ref_or_enomem(new (nothrow) UDPSocket(protocol, move(receive_buffer)));
 }
 
+ErrorOr<size_t> UDPSocket::protocol_size(ReadonlyBytes raw_ipv4_packet)
+{
+    auto& ipv4_packet = *(const IPv4Packet*)(raw_ipv4_packet.data());
+    auto& udp_packet = *static_cast<const UDPPacket*>(ipv4_packet.payload());
+    return udp_packet.length() - sizeof(UDPPacket);
+}
+
 ErrorOr<size_t> UDPSocket::protocol_receive(ReadonlyBytes raw_ipv4_packet, UserOrKernelBuffer& buffer, size_t buffer_size, [[maybe_unused]] int flags)
 {
     auto& ipv4_packet = *(const IPv4Packet*)(raw_ipv4_packet.data());
diff --git a/Kernel/Net/UDPSocket.h b/Kernel/Net/UDPSocket.h
index 74845b7a27..0678c207be 100644
--- a/Kernel/Net/UDPSocket.h
+++ b/Kernel/Net/UDPSocket.h
@@ -27,6 +27,7 @@ private:
 
     virtual ErrorOr<size_t> protocol_receive(ReadonlyBytes raw_ipv4_packet, UserOrKernelBuffer& buffer, size_t buffer_size, int flags) override;
     virtual ErrorOr<size_t> protocol_send(const UserOrKernelBuffer&, size_t) override;
+    virtual ErrorOr<size_t> protocol_size(ReadonlyBytes raw_ipv4_packet) override;
     virtual ErrorOr<void> protocol_connect(OpenFileDescription&, ShouldBlock) override;
     virtual ErrorOr<u16> protocol_allocate_local_port() override;
     virtual ErrorOr<void> protocol_bind() override;