[netstack] Move SO_REUSEPORT and SO_REUSEADDR option to SocketOptions.

This changes also introduces:
- `SocketOptionsHandler` interface which can be implemented by endpoints to
  handle endpoint specific behavior on SetSockOpt. This is analogous to what
  Linux does.
- `DefaultSocketOptionsHandler` which is a default implementation of the above.
  This is embedded in all endpoints so that we don't have to uselessly
  implement empty functions. Endpoints with specific behavior can override the
  embedded method by manually defining its own implementation.

PiperOrigin-RevId: 343158301

1 files changed, 8 insertions, 15 deletions

diff --git a/pkg/sentry/socket/netstack/netstack.go b/pkg/sentry/socket/netstack/netstack.go
index d48b92c66..bf6d8c5dc 100644
--- a/pkg/sentry/socket/netstack/netstack.go
+++ b/pkg/sentry/socket/netstack/netstack.go
@@ -1112,25 +1112,16 @@ func getSockOptSocket(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, fam
 			return nil, syserr.ErrInvalidArgument
 		}
 
-		v, err := ep.GetSockOptBool(tcpip.ReuseAddressOption)
-		if err != nil {
-			return nil, syserr.TranslateNetstackError(err)
-		}
-		vP := primitive.Int32(boolToInt32(v))
-		return &vP, nil
+		v := primitive.Int32(boolToInt32(ep.SocketOptions().GetReuseAddress()))
+		return &v, nil
 
 	case linux.SO_REUSEPORT:
 		if outLen < sizeOfInt32 {
 			return nil, syserr.ErrInvalidArgument
 		}
 
-		v, err := ep.GetSockOptBool(tcpip.ReusePortOption)
-		if err != nil {
-			return nil, syserr.TranslateNetstackError(err)
-		}
-
-		vP := primitive.Int32(boolToInt32(v))
-		return &vP, nil
+		v := primitive.Int32(boolToInt32(ep.SocketOptions().GetReusePort()))
+		return &v, nil
 
 	case linux.SO_BINDTODEVICE:
 		var v tcpip.BindToDeviceOption
@@ -1869,7 +1860,8 @@ func setSockOptSocket(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, nam
 		}
 
 		v := usermem.ByteOrder.Uint32(optVal)
-		return syserr.TranslateNetstackError(ep.SetSockOptBool(tcpip.ReuseAddressOption, v != 0))
+		ep.SocketOptions().SetReuseAddress(v != 0)
+		return nil
 
 	case linux.SO_REUSEPORT:
 		if len(optVal) < sizeOfInt32 {
@@ -1877,7 +1869,8 @@ func setSockOptSocket(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, nam
 		}
 
 		v := usermem.ByteOrder.Uint32(optVal)
-		return syserr.TranslateNetstackError(ep.SetSockOptBool(tcpip.ReusePortOption, v != 0))
+		ep.SocketOptions().SetReusePort(v != 0)
+		return nil
 
 	case linux.SO_BINDTODEVICE:
 		n := bytes.IndexByte(optVal, 0)