netstack/udp: connect with the AF_UNSPEC address family means disconnect

PiperOrigin-RevId: 256433283

1 files changed, 42 insertions, 37 deletions

diff --git a/pkg/tcpip/tcpip.go b/pkg/tcpip/tcpip.go
index 966b3acfd..c61f96fb0 100644
--- a/pkg/tcpip/tcpip.go
+++ b/pkg/tcpip/tcpip.go
@@ -66,43 +66,44 @@ func (e *Error) IgnoreStats() bool {
 
 // Errors that can be returned by the network stack.
 var (
-	ErrUnknownProtocol       = &Error{msg: "unknown protocol"}
-	ErrUnknownNICID          = &Error{msg: "unknown nic id"}
-	ErrUnknownDevice         = &Error{msg: "unknown device"}
-	ErrUnknownProtocolOption = &Error{msg: "unknown option for protocol"}
-	ErrDuplicateNICID        = &Error{msg: "duplicate nic id"}
-	ErrDuplicateAddress      = &Error{msg: "duplicate address"}
-	ErrNoRoute               = &Error{msg: "no route"}
-	ErrBadLinkEndpoint       = &Error{msg: "bad link layer endpoint"}
-	ErrAlreadyBound          = &Error{msg: "endpoint already bound", ignoreStats: true}
-	ErrInvalidEndpointState  = &Error{msg: "endpoint is in invalid state"}
-	ErrAlreadyConnecting     = &Error{msg: "endpoint is already connecting", ignoreStats: true}
-	ErrAlreadyConnected      = &Error{msg: "endpoint is already connected", ignoreStats: true}
-	ErrNoPortAvailable       = &Error{msg: "no ports are available"}
-	ErrPortInUse             = &Error{msg: "port is in use"}
-	ErrBadLocalAddress       = &Error{msg: "bad local address"}
-	ErrClosedForSend         = &Error{msg: "endpoint is closed for send"}
-	ErrClosedForReceive      = &Error{msg: "endpoint is closed for receive"}
-	ErrWouldBlock            = &Error{msg: "operation would block", ignoreStats: true}
-	ErrConnectionRefused     = &Error{msg: "connection was refused"}
-	ErrTimeout               = &Error{msg: "operation timed out"}
-	ErrAborted               = &Error{msg: "operation aborted"}
-	ErrConnectStarted        = &Error{msg: "connection attempt started", ignoreStats: true}
-	ErrDestinationRequired   = &Error{msg: "destination address is required"}
-	ErrNotSupported          = &Error{msg: "operation not supported"}
-	ErrQueueSizeNotSupported = &Error{msg: "queue size querying not supported"}
-	ErrNotConnected          = &Error{msg: "endpoint not connected"}
-	ErrConnectionReset       = &Error{msg: "connection reset by peer"}
-	ErrConnectionAborted     = &Error{msg: "connection aborted"}
-	ErrNoSuchFile            = &Error{msg: "no such file"}
-	ErrInvalidOptionValue    = &Error{msg: "invalid option value specified"}
-	ErrNoLinkAddress         = &Error{msg: "no remote link address"}
-	ErrBadAddress            = &Error{msg: "bad address"}
-	ErrNetworkUnreachable    = &Error{msg: "network is unreachable"}
-	ErrMessageTooLong        = &Error{msg: "message too long"}
-	ErrNoBufferSpace         = &Error{msg: "no buffer space available"}
-	ErrBroadcastDisabled     = &Error{msg: "broadcast socket option disabled"}
-	ErrNotPermitted          = &Error{msg: "operation not permitted"}
+	ErrUnknownProtocol           = &Error{msg: "unknown protocol"}
+	ErrUnknownNICID              = &Error{msg: "unknown nic id"}
+	ErrUnknownDevice             = &Error{msg: "unknown device"}
+	ErrUnknownProtocolOption     = &Error{msg: "unknown option for protocol"}
+	ErrDuplicateNICID            = &Error{msg: "duplicate nic id"}
+	ErrDuplicateAddress          = &Error{msg: "duplicate address"}
+	ErrNoRoute                   = &Error{msg: "no route"}
+	ErrBadLinkEndpoint           = &Error{msg: "bad link layer endpoint"}
+	ErrAlreadyBound              = &Error{msg: "endpoint already bound", ignoreStats: true}
+	ErrInvalidEndpointState      = &Error{msg: "endpoint is in invalid state"}
+	ErrAlreadyConnecting         = &Error{msg: "endpoint is already connecting", ignoreStats: true}
+	ErrAlreadyConnected          = &Error{msg: "endpoint is already connected", ignoreStats: true}
+	ErrNoPortAvailable           = &Error{msg: "no ports are available"}
+	ErrPortInUse                 = &Error{msg: "port is in use"}
+	ErrBadLocalAddress           = &Error{msg: "bad local address"}
+	ErrClosedForSend             = &Error{msg: "endpoint is closed for send"}
+	ErrClosedForReceive          = &Error{msg: "endpoint is closed for receive"}
+	ErrWouldBlock                = &Error{msg: "operation would block", ignoreStats: true}
+	ErrConnectionRefused         = &Error{msg: "connection was refused"}
+	ErrTimeout                   = &Error{msg: "operation timed out"}
+	ErrAborted                   = &Error{msg: "operation aborted"}
+	ErrConnectStarted            = &Error{msg: "connection attempt started", ignoreStats: true}
+	ErrDestinationRequired       = &Error{msg: "destination address is required"}
+	ErrNotSupported              = &Error{msg: "operation not supported"}
+	ErrQueueSizeNotSupported     = &Error{msg: "queue size querying not supported"}
+	ErrNotConnected              = &Error{msg: "endpoint not connected"}
+	ErrConnectionReset           = &Error{msg: "connection reset by peer"}
+	ErrConnectionAborted         = &Error{msg: "connection aborted"}
+	ErrNoSuchFile                = &Error{msg: "no such file"}
+	ErrInvalidOptionValue        = &Error{msg: "invalid option value specified"}
+	ErrNoLinkAddress             = &Error{msg: "no remote link address"}
+	ErrBadAddress                = &Error{msg: "bad address"}
+	ErrNetworkUnreachable        = &Error{msg: "network is unreachable"}
+	ErrMessageTooLong            = &Error{msg: "message too long"}
+	ErrNoBufferSpace             = &Error{msg: "no buffer space available"}
+	ErrBroadcastDisabled         = &Error{msg: "broadcast socket option disabled"}
+	ErrNotPermitted              = &Error{msg: "operation not permitted"}
+	ErrAddressFamilyNotSupported = &Error{msg: "address family not supported by protocol"}
 )
 
 // Errors related to Subnet
@@ -339,6 +340,10 @@ type Endpoint interface {
 	//		get the actual result. The first call to Connect after the socket has
 	//		connected returns nil. Calling connect again results in ErrAlreadyConnected.
 	//	Anything else -- the attempt to connect failed.
+	//
+	// If address.Addr is empty, this means that Enpoint has to be
+	// disconnected if this is supported, otherwise
+	// ErrAddressFamilyNotSupported must be returned.
 	Connect(address FullAddress) *Error
 
 	// Shutdown closes the read and/or write end of the endpoint connection