Re: [patch v2.3 1/4] netfilter: xt_ipvs (netfilter matcher for IPVS)

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Simon Horman wrote:
From:	Hannes Eder <heder@xxxxxxxxxx>

This implements the kernel-space side of the netfilter matcher xt_ipvs.
@@ -0,0 +1,25 @@
+#ifndef _XT_IPVS_H
+#define _XT_IPVS_H
+
+#define XT_IPVS_IPVS_PROPERTY	(1 << 0) /* all other options imply this one */
+#define XT_IPVS_PROTO		(1 << 1)
+#define XT_IPVS_VADDR		(1 << 2)
+#define XT_IPVS_VPORT		(1 << 3)
+#define XT_IPVS_DIR		(1 << 4)
+#define XT_IPVS_METHOD		(1 << 5)
+#define XT_IPVS_VPORTCTL	(1 << 6)
+#define XT_IPVS_MASK		((1 << 7) - 1)
+#define XT_IPVS_ONCE_MASK	(XT_IPVS_MASK & ~XT_IPVS_IPVS_PROPERTY)
+
+struct xt_ipvs_mtinfo {
+	union nf_inet_addr	vaddr, vmask;
+	__be16			vport;
+	__u16			l4proto;
+	__u16			fwd_method;
It seems you could use __u8 for both l4proto and fwd_method
and reduce the match size by 2 bytes.

+	__be16			vportctl;
+
+	__u8			invert;
+	__u8			bitmask;
+};
+static bool
+ipvs_mt(const struct sk_buff *skb, struct xt_action_param *par)
+...
+ if (data->bitmask & XT_IPVS_DIR) {
+		enum ip_conntrack_info ctinfo;
+		struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
+
+		if (ct == NULL || ct == &nf_conntrack_untracked) {
We're using per-cpu structures for nf_conntrack_untracked in the
current net-next/nf-next tree, so this doesn't work anymore. You
need to use nf_ct_is_untracked() instead.

+			match = false;
+			goto out_put_cp;
+		}

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