[IPSEC]: Move xfrm_state_check into xfrm_output.c

The functions xfrm_state_check and xfrm_state_check_space are only used by
the output code in xfrm_output.c so we can move them over.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -1013,7 +1013,6 @@ extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
 extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
 extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
 extern void xfrm_replay_notify(struct xfrm_state *x, int event);
-extern int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb);
 extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
 extern int xfrm_init_state(struct xfrm_state *x);
 extern int xfrm_output(struct sk_buff *skb);

net/xfrm/xfrm_output.c

@@ -18,6 +18,28 @@
 #include <net/dst.h>
 #include <net/xfrm.h>
 
+static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
+{
+	int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev)
+		- skb_headroom(skb);
+
+	if (nhead > 0)
+		return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
+
+	/* Check tail too... */
+	return 0;
+}
+
+static int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb)
+{
+	int err = xfrm_state_check_expire(x);
+	if (err < 0)
+		goto err;
+	err = xfrm_state_check_space(x, skb);
+err:
+	return err;
+}
+
 int xfrm_output(struct sk_buff *skb)
 {
 	struct dst_entry *dst = skb->dst;

net/xfrm/xfrm_state.c

@@ -1152,29 +1152,6 @@ int xfrm_state_check_expire(struct xfrm_state *x)
 }
 EXPORT_SYMBOL(xfrm_state_check_expire);
 
-static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
-{
-	int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev)
-		- skb_headroom(skb);
-
-	if (nhead > 0)
-		return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
-
-	/* Check tail too... */
-	return 0;
-}
-
-int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb)
-{
-	int err = xfrm_state_check_expire(x);
-	if (err < 0)
-		goto err;
-	err = xfrm_state_check_space(x, skb);
-err:
-	return err;
-}
-EXPORT_SYMBOL(xfrm_state_check);
-
 struct xfrm_state *
 xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto,
 		  unsigned short family)