* Multicast broken on x86_64 (Patch Included)
@ 2004-02-26 16:26 Brian Childs
0 siblings, 0 replies; 2+ messages in thread
From: Brian Childs @ 2004-02-26 16:26 UTC (permalink / raw)
To: linux-kernel
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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2004-02-26 16:26 Multicast broken on x86_64 (Patch Included) Brian Childs
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2004-02-26 17:14 ` Andi Kleen
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