From: David S. Miller <davem@sunset.davemloft.net>
Date: Fri, 20 Jan 2006 19:57:07 +0000 (-0800)
Subject: [NETFILTER]: Unbreak x-tables on x86.
X-Git-Tag: v2.6.16-rc2~252^2~11
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6fbfc9688448aac064edbaccb5d30ecd565a9105;p=linux-2.6

[NETFILTER]: Unbreak x-tables on x86.

x86 defines __alignof__(long long) as 8 yet it gives 4
for a struct containing a long long, ho hum... so my
simplified form doesn't work everywhere.

So use Harald Welte's original patch, which should work
on all platforms.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index 59ff6c430c..6500d4e59d 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -19,7 +19,21 @@ struct xt_get_revision
 /* For standard target */
 #define XT_RETURN (-NF_REPEAT - 1)
 
-#define XT_ALIGN(s) (((s) + (__alignof__(u_int64_t)-1)) & ~(__alignof__(u_int64_t)-1))
+/* this is a dummy structure to find out the alignment requirement for a struct
+ * containing all the fundamental data types that are used in ipt_entry,
+ * ip6t_entry and arpt_entry.  This sucks, and it is a hack.  It will be my
+ * personal pleasure to remove it -HW
+ */
+struct _xt_align
+{
+	u_int8_t u8;
+	u_int16_t u16;
+	u_int32_t u32;
+	u_int64_t u64;
+};
+
+#define XT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) 	\
+			& ~(__alignof__(struct _xt_align)-1))
 
 /* Standard return verdict, or do jump. */
 #define XT_STANDARD_TARGET ""