Multicast broken on x86_64 (Patch Included)

[Brian Childs]

csum-partial.c in 2.4.25 and 2.6.3 has a bug that causes it to compute
the checksum incorrectly.

As a result, multicast doesn't work.  It looks as though iptables is
also affected.

Anyway, here's a simple patch.

Brian

diff -ruN linux-2.4.25-orig/arch/x86_64/lib/csum-partial.c linux-2.4.25/arch/x86_64/lib/csum-partial.c
--- linux-2.4.25-orig/arch/x86_64/lib/csum-partial.c	2003-06-13 10:51:32.000000000 -0400
+++ linux-2.4.25/arch/x86_64/lib/csum-partial.c	2004-02-26 11:20:17.000000000 -0500
@@ -141,6 +141,6 @@
  */
 unsigned short ip_compute_csum(unsigned char * buff, int len)
 {
-	return ~csum_partial(buff,len,0); 
+	return csum_fold(csum_partial(buff,len,0));
 }
 

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