[NETFILTER]: ipt_ULOG: add compat conversion functions

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 40 insertions, 0 deletions

diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
index d26bbd2daaa..a2bcba70af5 100644
--- a/net/ipv4/netfilter/ipt_ULOG.c
+++ b/net/ipv4/netfilter/ipt_ULOG.c
@@ -349,12 +349,52 @@ static int ipt_ulog_checkentry(const char *tablename,
         return 1;
 }
 
+#ifdef CONFIG_COMPAT
+struct compat_ipt_ulog_info {
+        compat_uint_t   nl_group;
+        compat_size_t   copy_range;
+        compat_size_t   qthreshold;
+        char            prefix[ULOG_PREFIX_LEN];
+};
+
+static void compat_from_user(void *dst, void *src)
+{
+        struct compat_ipt_ulog_info *cl = src;
+        struct ipt_ulog_info l = {
+                .nl_group       = cl->nl_group,
+                .copy_range     = cl->copy_range,
+                .qthreshold     = cl->qthreshold,
+        };
+
+        memcpy(l.prefix, cl->prefix, sizeof(l.prefix));
+        memcpy(dst, &l, sizeof(l));
+}
+
+static int compat_to_user(void __user *dst, void *src)
+{
+        struct ipt_ulog_info *l = src;
+        struct compat_ipt_ulog_info cl = {
+                .nl_group       = l->nl_group,
+                .copy_range     = l->copy_range,
+                .qthreshold     = l->qthreshold,
+        };
+
+        memcpy(cl.prefix, l->prefix, sizeof(cl.prefix));
+        return copy_to_user(dst, &cl, sizeof(cl)) ? -EFAULT : 0;
+}
+#endif /* CONFIG_COMPAT */
+
 static struct xt_target ipt_ulog_reg = {
         .name           = "ULOG",
         .family         = AF_INET,
         .target         = ipt_ulog_target,
         .targetsize     = sizeof(struct ipt_ulog_info),
         .checkentry     = ipt_ulog_checkentry,
+#ifdef CONFIG_COMPAT
+        .compatsize     = sizeof(struct compat_ipt_ulog_info),
+        .compat_from_user = compat_from_user,
+        .compat_to_user = compat_to_user,
+#endif
         .me             = THIS_MODULE,
 };