[SECMARK]: Add secmark support to conntrack

Add a secmark field to IP and NF conntracks, so that security markings
on packets can be copied to their associated connections, and also
copied back to packets as required.  This is similar to the network
mark field currently used with conntrack, although it is intended for
enforcement of security policy rather than network policy.

Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 30 insertions, 0 deletions

diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index dbe7a114d0c5..411117815807 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -114,6 +114,10 @@ struct nf_conn
         u_int32_t mark;
 #endif
 
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+        u_int32_t secmark;
+#endif
+
         /* Storage reserved for other modules: */
         union nf_conntrack_proto proto;
 
diff --git a/include/net/netfilter/nf_conntrack_compat.h b/include/net/netfilter/nf_conntrack_compat.h
index 3cac19fb3648..f1b1482d7200 100644
--- a/include/net/netfilter/nf_conntrack_compat.h
+++ b/include/net/netfilter/nf_conntrack_compat.h
@@ -20,6 +20,19 @@ static inline u_int32_t *nf_ct_get_mark(const struct sk_buff *skb,
 }
 #endif /* CONFIG_IP_NF_CONNTRACK_MARK */
 
+#ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
+static inline u_int32_t *nf_ct_get_secmark(const struct sk_buff *skb,
+                                           u_int32_t *ctinfo)
+{
+        struct ip_conntrack *ct = ip_conntrack_get(skb, ctinfo);
+
+        if (ct)
+                return &ct->secmark;
+        else
+                return NULL;
+}
+#endif /* CONFIG_IP_NF_CONNTRACK_SECMARK */
+
 #ifdef CONFIG_IP_NF_CT_ACCT
 static inline struct ip_conntrack_counter *
 nf_ct_get_counters(const struct sk_buff *skb)
@@ -70,6 +83,19 @@ static inline u_int32_t *nf_ct_get_mark(const struct sk_buff *skb,
 }
 #endif /* CONFIG_NF_CONNTRACK_MARK */
 
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+static inline u_int32_t *nf_ct_get_secmark(const struct sk_buff *skb,
+                                           u_int32_t *ctinfo)
+{
+        struct nf_conn *ct = nf_ct_get(skb, ctinfo);
+
+        if (ct)
+                return &ct->secmark;
+        else
+                return NULL;
+}
+#endif /* CONFIG_NF_CONNTRACK_MARK */
+
 #ifdef CONFIG_NF_CT_ACCT
 static inline struct ip_conntrack_counter *
 nf_ct_get_counters(const struct sk_buff *skb)