add rate limiter

internal/net/net.go

@@ -1,5 +1,28 @@
 package net
 
+import (
+	"net"
+	"syscall"
+)
+
+type SetBuffer interface {
+	SetReadBuffer(bytes int) error
+	SetWriteBuffer(bytes int) error
+}
+
+type SyscallConn interface {
+	SyscallConn() (syscall.RawConn, error)
+}
+
+type RemoteAddr interface {
+	RemoteAddr() net.Addr
+}
+
+// tcpraw.TCPConn
+type SetDSCP interface {
+	SetDSCP(int) error
+}
+
 func IsIPv4(address string) bool {
 	return address != "" && address[0] != ':' && address[0] != '['
 }

internal/net/udp/conn.go

@@ -0,0 +1,29 @@
+package udp
+
+import (
+	"io"
+	"net"
+
+	xnet "github.com/go-gost/x/internal/net"
+)
+
+type Conn interface {
+	net.PacketConn
+	io.Reader
+	io.Writer
+	ReadUDP
+	WriteUDP
+	xnet.SetBuffer
+	xnet.SyscallConn
+	xnet.RemoteAddr
+}
+
+type ReadUDP interface {
+	ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error)
+	ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAddr, err error)
+}
+
+type WriteUDP interface {
+	WriteToUDP(b []byte, addr *net.UDPAddr) (int, error)
+	WriteMsgUDP(b, oob []byte, addr *net.UDPAddr) (n, oobn int, err error)
+}