X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=KernelLand%2FModules%2FIPStack%2Fmain.c;h=82373ece03c5344ad5ecf97078dc6d090e09a0dd;hb=17b6125504e385c169193f3c8e29ced340425979;hp=bc920f1f6d97af9deff6d7cc64ce4c029fc4d7a2;hpb=d0b4559f2936f6d9f06be0f7c3c51527a480ec0d;p=tpg%2Facess2.git

diff --git a/KernelLand/Modules/IPStack/main.c b/KernelLand/Modules/IPStack/main.c
index bc920f1f..82373ece 100644
--- a/KernelLand/Modules/IPStack/main.c
+++ b/KernelLand/Modules/IPStack/main.c
@@ -108,6 +108,26 @@ int IPStack_CompareAddress(int AddressType, const void *Address1, const void *Ad
 	return 0;
 }
 
+bool IPStack_AddressIsBroadcast(int AddrType, const void *Addr, int SubnetBits)
+{
+	const size_t	addrsize = IPStack_GetAddressSize(AddrType);
+	const Uint8	*addr = Addr;
+	
+	ASSERTC( SubnetBits, >=, 0 );
+	ASSERTC( SubnetBits, <=, addrsize * 8 );
+	const size_t	host_bits = addrsize*8 - SubnetBits;
+	
+	for( int i = 0; i < host_bits/8; i ++ )
+	{
+		if( addr[addrsize-i-1] != 0xFF )
+			return false;
+	}
+	Uint8	mask = 0xFF >> (8-(host_bits%8));
+	if( (addr[addrsize-host_bits/8-1] & mask) != mask )
+		return false;
+	return true;
+}
+
 const char *IPStack_PrintAddress(int AddressType, const void *Address)
 {
 	switch( AddressType )