xfrm: Export xfrm_parse_spi.

We need it in the ESP offload handlers, so export it.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

include/net/xfrm.h

@@ -1520,6 +1520,7 @@ int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
 		    int encap_type);
 int xfrm4_transport_finish(struct sk_buff *skb, int async);
 int xfrm4_rcv(struct sk_buff *skb);
+int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
 
 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
 {

net/xfrm/xfrm_input.c

@@ -170,6 +170,7 @@ int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
 	*seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
 	return 0;
 }
+EXPORT_SYMBOL(xfrm_parse_spi);
 
 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
 {