[IPSEC]: Fix inter address family IPsec tunnel handling.

Signed-off-by: Kazunori MIYAZAWA <kazunori@miyazawa.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 3 deletions

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 62188c6a06dd..75279402ccf4 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -84,14 +84,21 @@ int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
 
 int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
 {
+        struct xfrm_mode *inner_mode = x->inner_mode;
         int err;
 
         err = x->outer_mode->afinfo->extract_input(x, skb);
         if (err)
                 return err;
 
-        skb->protocol = x->inner_mode->afinfo->eth_proto;
-        return x->inner_mode->input2(x, skb);
+        if (x->sel.family == AF_UNSPEC) {
+                inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
+                if (inner_mode == NULL)
+                        return -EAFNOSUPPORT;
+        }
+
+        skb->protocol = inner_mode->afinfo->eth_proto;
+        return inner_mode->input2(x, skb);
 }
 EXPORT_SYMBOL(xfrm_prepare_input);
 
@@ -101,6 +108,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
         __be32 seq;
         struct xfrm_state *x;
         xfrm_address_t *daddr;
+        struct xfrm_mode *inner_mode;
         unsigned int family;
         int decaps = 0;
         int async = 0;
@@ -207,7 +215,15 @@ resume:
 
                 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
 
-                if (x->inner_mode->input(x, skb)) {
+                inner_mode = x->inner_mode;
+
+                if (x->sel.family == AF_UNSPEC) {
+                        inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
+                        if (inner_mode == NULL)
+                                goto drop;
+                }
+
+                if (inner_mode->input(x, skb)) {
                         XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMODEERROR);
                         goto drop;
                 }