On Thu, 9 Feb 2012, Bart De Schuymer wrote:
Op 3/02/2012 8:21, joe@xxxxxxx schreef:
What I've seen is that ebt_among extension of ebtables uses
__alignof__(_xt_align) while the corresponding kernel module uses
__alignof__(ebt_replace) to determin the alignment in EBT_ALIGN().
These are the results of these values on different platforms:
x86 x86_64 ppc
__alignof__(_xt_align) 4 8 8
__alignof__(ebt_replace) 4 8 4
So I assume here we can see why ebtales fails to add rules which use the
among extension.
I'm using kernel 2.6.33 and ebtables 2.0.10-4
Is this a known issue or are there any suggestions how to circumvent this
problem?
Thankyou very much.
The userspace alignment was changed to _xt_align to fix an alignment issue on
a userspace32-kernel64 system (I think it was for an ARM device). So
userspace must be right. The kernel alignment macro needs to change so it
also uses _xt_align instead of ebt_replace. The userspace changes date back
from June 29, 2009.
Can you do these changes and provide a patch?
Thank you very much for the input. I did the proposed changes which solved
my problem.
See below for the patch (hopefully it's the way you expect it...)
Best regards,
Joerg
---
diff -rupN a/include/linux/netfilter_bridge/ebtables.h
b/include/linux/netfilter_bridge/ebtables.h
--- a/include/linux/netfilter_bridge/ebtables.h 2010-08-02
19:27:18.000000000 +0200
+++ b/include/linux/netfilter_bridge/ebtables.h 2012-02-10
12:01:56.464822589 +0100
@@ -285,8 +285,8 @@ struct ebt_table {
struct module *me;
};
-#define EBT_ALIGN(s) (((s) + (__alignof__(struct ebt_replace)-1)) & \
- ~(__alignof__(struct ebt_replace)-1))
+#define EBT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) & \
+ ~(__alignof__(struct _xt_align)-1))
extern struct ebt_table *ebt_register_table(struct net *net,
const struct ebt_table
*table);
extern void ebt_unregister_table(struct ebt_table *table);
--
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