xfrm: Add xfrm_tunnel_skb_cb to the skb common buffer

IPsec vti_rcv needs to remind the tunnel pointer to
check it later at the vti_rcv_cb callback. So add
this pointer to the IPsec common buffer, initialize
it and check it to avoid transport state matching of
a tunneled packet.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

1 files changed, 38 insertions, 12 deletions

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 345a150..3311259 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -599,16 +599,27 @@ struct xfrm_mgr {
 int xfrm_register_km(struct xfrm_mgr *km);
 int xfrm_unregister_km(struct xfrm_mgr *km);
 
+struct xfrm_tunnel_skb_cb {
+	union {
+		struct inet_skb_parm h4;
+		struct inet6_skb_parm h6;
+	} header;
+
+	union {
+		struct ip_tunnel *ip4;
+		struct ip6_tnl *ip6;
+	} tunnel;
+};
+
+#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
+
 /*
  * This structure is used for the duration where packets are being
  * transformed by IPsec.  As soon as the packet leaves IPsec the
  * area beyond the generic IP part may be overwritten.
  */
 struct xfrm_skb_cb {
-	union {
-		struct inet_skb_parm h4;
-		struct inet6_skb_parm h6;
-        } header;
+	struct xfrm_tunnel_skb_cb header;
 
         /* Sequence number for replay protection. */
 	union {
@@ -630,10 +641,7 @@ struct xfrm_skb_cb {
  * to transmit header information to the mode input/output functions.
  */
 struct xfrm_mode_skb_cb {
-	union {
-		struct inet_skb_parm h4;
-		struct inet6_skb_parm h6;
-	} header;
+	struct xfrm_tunnel_skb_cb header;
 
 	/* Copied from header for IPv4, always set to zero and DF for IPv6. */
 	__be16 id;
@@ -665,10 +673,7 @@ struct xfrm_mode_skb_cb {
  * related information.
  */
 struct xfrm_spi_skb_cb {
-	union {
-		struct inet_skb_parm h4;
-		struct inet6_skb_parm h6;
-	} header;
+	struct xfrm_tunnel_skb_cb header;
 
 	unsigned int daddroff;
 	unsigned int family;
@@ -1510,6 +1515,7 @@ int xfrm4_rcv(struct sk_buff *skb);
 
 static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
 {
+	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
 	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
 	return xfrm_input(skb, nexthdr, spi, 0);
@@ -1781,4 +1787,24 @@ static inline int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family,
 	return 0;
 }
 
+static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
+				    unsigned int family)
+{
+	bool tunnel = false;
+
+	switch(family) {
+	case AF_INET:
+		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
+			tunnel = true;
+		break;
+	case AF_INET6:
+		if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
+			tunnel = true;
+		break;
+	}
+	if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
+		return -EINVAL;
+
+	return 0;
+}
 #endif	/* _NET_XFRM_H */