[IPSEC]: Move tunnel parsing for IPv4 out of xfrm4_input

This patch moves the tunnel parsing for IPv4 out of xfrm4_input and into
xfrm4_tunnel.  This change is in line with what IPv6 does and will allow
us to merge the two input functions.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 2 deletions

diff --git a/net/ipv4/xfrm4_tunnel.c b/net/ipv4/xfrm4_tunnel.c
index 83e9580feac4..326845195620 100644
--- a/net/ipv4/xfrm4_tunnel.c
+++ b/net/ipv4/xfrm4_tunnel.c
@@ -48,20 +48,25 @@ static struct xfrm_type ipip_type = {
         .output         = ipip_output
 };
 
+static int xfrm_tunnel_rcv(struct sk_buff *skb)
+{
+        return xfrm4_rcv_spi(skb, IPPROTO_IP, ip_hdr(skb)->saddr);
+}
+
 static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
 {
         return -ENOENT;
 }
 
 static struct xfrm_tunnel xfrm_tunnel_handler = {
-        .handler        =       xfrm4_rcv,
+        .handler        =       xfrm_tunnel_rcv,
         .err_handler    =       xfrm_tunnel_err,
         .priority       =       2,
 };
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 static struct xfrm_tunnel xfrm64_tunnel_handler = {
-        .handler        =       xfrm4_rcv,
+        .handler        =       xfrm_tunnel_rcv,
         .err_handler    =       xfrm_tunnel_err,
         .priority       =       2,
 };