* datalink_control() also need to accept structures smaller than ifreq as long

as the interface name can be specified.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38015 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/network/stack/datalink.cpp

@@ -309,12 +309,15 @@ datalink_control(net_domain* _domain, int32 option, void* value,
 
 		default:
 		{
-			if (*_length < sizeof(struct ifreq))
+			// We also accept partial ifreqs as long as the name is complete.
+			if (*_length < IF_NAMESIZE)
 				return B_BAD_VALUE;
 
+			size_t length = min_c(sizeof(struct ifreq), *_length);
+
 			// try to pass the request to an existing interface
 			struct ifreq request;
-			if (user_memcpy(&request, value, sizeof(struct ifreq)) < B_OK)
+			if (user_memcpy(&request, value, length) != B_OK)
 				return B_BAD_ADDRESS;
 
 			Interface* interface = get_interface(domain, request.ifr_name);

src/add-ons/kernel/network/stack/interfaces.cpp

@@ -649,6 +649,9 @@ Interface::Control(net_domain* domain, int32 option, ifreq& request,
 	switch (option) {
 		case SIOCSIFFLAGS:
 		{
+			if (length != sizeof(ifreq))
+				return B_BAD_VALUE;
+
 			uint32 requestFlags = request.ifr_flags;
 			uint32 oldFlags = flags;
 			status_t status = B_OK;
@@ -677,6 +680,9 @@ Interface::Control(net_domain* domain, int32 option, ifreq& request,
 		
 		case B_SOCKET_SET_ALIAS:
 		{
+			if (length != sizeof(ifaliasreq))
+				return B_BAD_VALUE;
+
 			RecursiveLocker locker(fLock);
 
 			ifaliasreq aliasRequest;
@@ -726,6 +732,9 @@ Interface::Control(net_domain* domain, int32 option, ifreq& request,
 		case SIOCSIFDSTADDR:
 		case SIOCDIFADDR:
 		{
+			if (length != sizeof(ifreq))
+				return B_BAD_VALUE;
+
 			RecursiveLocker locker(fLock);
 			
 			InterfaceAddress* address = NULL;