fixed a long standing binding issue with spawned sockets and TCP. also fixed bind() address checking rules.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20866 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/network/protocols/tcp/EndpointManager.cpp

@@ -257,11 +257,21 @@ EndpointManager::Bind(TCPEndpoint *endpoint, const sockaddr *address)
 
 
 status_t
-EndpointManager::_BindToAddress(TCPEndpoint *endpoint, const sockaddr *address)
+EndpointManager::BindChild(TCPEndpoint *endpoint)
+{
+	BenaphoreLocker _(fLock);
+	return _Bind(endpoint, *endpoint->LocalAddress());
+}
+
+
+status_t
+EndpointManager::_BindToAddress(TCPEndpoint *endpoint, const sockaddr *_address)
 {
 	TRACE(("EndpointManager::BindToAddress(%p)\n", endpoint));
 
-	uint16 port = AddressModule()->get_port(address);
+	ConstSocketAddress address(AddressModule(), _address);
+
+	uint16 port = address.Port();
 
 	// TODO this check follows very typical UNIX semantics
 	//      and generally should be improved.
@@ -270,33 +280,20 @@ EndpointManager::_BindToAddress(TCPEndpoint *endpoint, const sockaddr *address)
 
 	EndpointTable::Iterator portUsers = fEndpointHash.Lookup(port);
 
-	// If there is already an endpoint bound to that port, SO_REUSEADDR has to be
-	// specified by the new endpoint to be allowed to bind to that same port.
-	// Alternatively, all endpoints must have the SO_REUSEPORT option set.
-	if (portUsers.HasNext()) {
+	while (portUsers.HasNext()) {
 		TCPEndpoint *user = portUsers.Next();
 
-		if ((endpoint->socket->options & SO_REUSEADDR) == 0
-			&& ((endpoint->socket->options & SO_REUSEPORT) == 0
-				|| (user->socket->options & SO_REUSEPORT) == 0))
-			return EADDRINUSE;
-
-		do {
-			// check if this endpoint binds to a wildcard address
-			if (user->LocalAddress().IsEmpty(false)) {
-				// you cannot specialize a wildcard endpoint - you have to open
-				// the wildcard endpoint last
-				return B_PERMISSION_DENIED;
-			}
-
-			if (portUsers.HasNext())
-				user = portUsers.Next();
-			else
-				break;
-		} while (true);
+		if (user->LocalAddress().IsEmpty(false)
+			|| address.EqualTo(*user->LocalAddress(), false)) {
+			if ((endpoint->socket->options & SO_REUSEADDR) == 0)
+				return EADDRINUSE;
+			// TODO lock endpoint before retriving state?
+			if (user->State() != TIME_WAIT && user->State() != CLOSED)
+				return EADDRINUSE;
+		}
 	}
 
-	return _Bind(endpoint, address);
+	return _Bind(endpoint, *address);
 }
 
 
@@ -368,10 +365,8 @@ EndpointManager::Unbind(TCPEndpoint *endpoint)
 
 	BenaphoreLocker _(fLock);
 
-	if (!fEndpointHash.Remove(endpoint)) {
-		if (!endpoint->fSpawned)
-			panic("bound endpoint %p not in hash!", endpoint);
-	}
+	if (!fEndpointHash.Remove(endpoint))
+		panic("bound endpoint %p not in hash!", endpoint);
 
 	fConnectionHash.Remove(endpoint);
 

src/add-ons/kernel/network/protocols/tcp/EndpointManager.h

@@ -71,6 +71,7 @@ class EndpointManager : public DoublyLinkedListLinkImpl<EndpointManager> {
 		status_t SetPassive(TCPEndpoint *endpoint);
 
 		status_t Bind(TCPEndpoint *endpoint, const sockaddr *address);
+		status_t BindChild(TCPEndpoint *endpoint);
 		status_t Unbind(TCPEndpoint *endpoint);
 
 		status_t ReplyWithReset(tcp_segment_header &segment,

src/add-ons/kernel/network/protocols/tcp/TCPEndpoint.cpp

@@ -241,8 +241,7 @@ TCPEndpoint::TCPEndpoint(net_socket *socket)
 	fSlowStartThreshold(0),
 	fState(CLOSED),
 	fFlags(FLAG_OPTION_WINDOW_SCALE | FLAG_OPTION_TIMESTAMP),
-	fError(B_OK),
-	fSpawned(false)
+	fError(B_OK)
 {
 	//gStackModule->init_timer(&fTimer, _TimeWait, this);
 
@@ -823,7 +822,6 @@ TCPEndpoint::Spawn(TCPEndpoint *parent, tcp_segment_header &segment,
 
 	fState = SYNCHRONIZE_RECEIVED;
 	fManager = parent->fManager;
-	fSpawned = true;
 
 	LocalAddress().SetTo(&buffer->destination);
 	PeerAddress().SetTo(&buffer->source);
@@ -831,6 +829,9 @@ TCPEndpoint::Spawn(TCPEndpoint *parent, tcp_segment_header &segment,
 	TRACE("Spawn()");
 
 	// TODO: proper error handling!
+	if (fManager->BindChild(this) < B_OK)
+		return DROP;
+
 	if (_PrepareSendPath(*PeerAddress()) < B_OK)
 		return DROP;
 

src/add-ons/kernel/network/protocols/tcp/TCPEndpoint.h

@@ -169,8 +169,6 @@ class TCPEndpoint : public net_protocol, public ProtocolSocket {
 		uint32			fFlags;
 		status_t		fError;
 
-		bool			fSpawned;
-
 		// timer
 		net_timer		fRetransmitTimer;
 		net_timer		fPersistTimer;