xfrm: choose protocol family by skb protocol
We need to choose the protocol family by skb->protocol. Otherwise we
call the wrong xfrm{4,6}_local_error handler in case an ipv6 sockets is
used in ipv4 mode, in which case we should call down to xfrm4_local_error
(ip6 sockets are a superset of ip4 ones).
We are called before before ip_output functions, so skb->protocol is
not reset.
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index b41d2d1..ac5b025 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1728,9 +1728,9 @@
{
struct sock *sk = skb->sk;
- if (sk && sk->sk_family == AF_INET6)
+ if (sk && skb->protocol == htons(ETH_P_IPV6))
return ip6_skb_dst_mtu(skb);
- else if (sk && sk->sk_family == AF_INET)
+ else if (sk && skb->protocol == htons(ETH_P_IP))
return ip_skb_dst_mtu(skb);
return dst_mtu(skb_dst(skb));
}
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index 6f5fc61..3bb2cdc 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -216,9 +216,17 @@
void xfrm_local_error(struct sk_buff *skb, int mtu)
{
+ unsigned int proto;
struct xfrm_state_afinfo *afinfo;
- afinfo = xfrm_state_get_afinfo(skb->sk->sk_family);
+ if (skb->protocol == htons(ETH_P_IP))
+ proto = AF_INET;
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ proto = AF_INET6;
+ else
+ return;
+
+ afinfo = xfrm_state_get_afinfo(proto);
if (!afinfo)
return;