xfrm: introduce basic mark infrastructure

Add basic structuring and accessors for xfrm mark

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/xfrm.h

@@ -267,8 +267,8 @@ enum xfrm_attr_type_t {
 	XFRMA_ALG_COMP,		/* struct xfrm_algo */
 	XFRMA_ENCAP,		/* struct xfrm_algo + struct xfrm_encap_tmpl */
 	XFRMA_TMPL,		/* 1 or more struct xfrm_user_tmpl */
-	XFRMA_SA,
-	XFRMA_POLICY,
+	XFRMA_SA,		/* struct xfrm_usersa_info  */
+	XFRMA_POLICY,		/*struct xfrm_userpolicy_info */
 	XFRMA_SEC_CTX,		/* struct xfrm_sec_ctx */
 	XFRMA_LTIME_VAL,
 	XFRMA_REPLAY_VAL,
@@ -276,17 +276,23 @@ enum xfrm_attr_type_t {
 	XFRMA_ETIMER_THRESH,
 	XFRMA_SRCADDR,		/* xfrm_address_t */
 	XFRMA_COADDR,		/* xfrm_address_t */
-	XFRMA_LASTUSED,
+	XFRMA_LASTUSED,		/* unsigned long  */
 	XFRMA_POLICY_TYPE,	/* struct xfrm_userpolicy_type */
 	XFRMA_MIGRATE,
 	XFRMA_ALG_AEAD,		/* struct xfrm_algo_aead */
 	XFRMA_KMADDRESS,        /* struct xfrm_user_kmaddress */
 	XFRMA_ALG_AUTH_TRUNC,	/* struct xfrm_algo_auth */
+	XFRMA_MARK,		/* struct xfrm_mark */
 	__XFRMA_MAX
 
 #define XFRMA_MAX (__XFRMA_MAX - 1)
 };
 
+struct xfrm_mark {
+	__u32           v; /* value */
+	__u32           m; /* mask */
+};
+
 enum xfrm_sadattr_type_t {
 	XFRMA_SAD_UNSPEC,
 	XFRMA_SAD_CNT,

include/net/xfrm.h

@@ -140,6 +140,7 @@ struct xfrm_state {
 
 	struct xfrm_id		id;
 	struct xfrm_selector	sel;
+	struct xfrm_mark	mark;
 
 	u32			genid;
 
@@ -481,6 +482,7 @@ struct xfrm_policy {
 
 	u32			priority;
 	u32			index;
+	struct xfrm_mark	mark;
 	struct xfrm_selector	selector;
 	struct xfrm_lifetime_cfg lft;
 	struct xfrm_lifetime_cur curlft;
@@ -1570,4 +1572,24 @@ static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
 }
 #endif
 
+static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m)
+{
+	if (attrs[XFRMA_MARK])
+		memcpy(m, nla_data(attrs[XFRMA_MARK]), sizeof(m));
+	else
+		m->v = m->m = 0;
+
+	return m->v & m->m;
+}
+
+static inline int xfrm_mark_put(struct sk_buff *skb, struct xfrm_mark *m)
+{
+	if (m->m | m->v)
+		NLA_PUT(skb, XFRMA_MARK, sizeof(struct xfrm_mark), m);
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
 #endif	/* _NET_XFRM_H */