netfilter: ebt_limit: add CONFIG_COMPAT support

ebt_limit structure is larger on 64 bit systems due
to "long" type used in the (kernel-only) data section.

Setting .compatsize is enough in this case, these values
have no meaning in userspace.

Signed-off-by: Florian Westphal <fwestphal@astaro.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/net/bridge/netfilter/ebt_limit.c b/net/bridge/netfilter/ebt_limit.c
index 9dd16e6b10e7..7a8182710eb3 100644
--- a/net/bridge/netfilter/ebt_limit.c
+++ b/net/bridge/netfilter/ebt_limit.c
@@ -84,6 +84,19 @@ static bool ebt_limit_mt_check(const struct xt_mtchk_param *par)
         return true;
 }
 
+
+#ifdef CONFIG_COMPAT
+/*
+ * no conversion function needed --
+ * only avg/burst have meaningful values in userspace.
+ */
+struct ebt_compat_limit_info {
+        compat_uint_t avg, burst;
+        compat_ulong_t prev;
+        compat_uint_t credit, credit_cap, cost;
+};
+#endif
+
 static struct xt_match ebt_limit_mt_reg __read_mostly = {
         .name           = "limit",
         .revision       = 0,
@@ -91,6 +104,9 @@ static struct xt_match ebt_limit_mt_reg __read_mostly = {
         .match          = ebt_limit_mt,
         .checkentry     = ebt_limit_mt_check,
         .matchsize      = sizeof(struct ebt_limit_info),
+#ifdef CONFIG_COMPAT
+        .compatsize     = sizeof(struct ebt_compat_limit_info),
+#endif
         .me             = THIS_MODULE,
 };