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xfrm: Fix eth_hdr(skb)->h_proto to reflect inner IP version

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IPSec tunnel mode supports encapsulation of IPv4 over IPv6 and vice-versa.

The outer IP header is stripped and the inner IP inherits the original
Ethernet header. Tcpdump fails to properly decode the inner packet in
case that h_proto is different than the inner IP version.

Fix h_proto to reflect the inner IP version.

Signed-off-by: Yossi Kuperman <yossiku@mellanox.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Yossi Kuperman 2018-01-23 00:16:21 +02:00 committed by Steffen Klassert
parent aa5dd6fa6f
commit 5efec5c655
2 changed files with 2 additions and 0 deletions
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1
net/ipv4/xfrm4_mode_tunnel.c
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@ -92,6 +92,7 @@ static int xfrm4_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
skb_reset_network_header(skb);
skb_mac_header_rebuild(skb);
eth_hdr(skb)->h_proto = skb->protocol;
err = 0;

1
net/ipv6/xfrm6_mode_tunnel.c
View File

@ -92,6 +92,7 @@ static int xfrm6_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
skb_reset_network_header(skb);
skb_mac_header_rebuild(skb);
eth_hdr(skb)->h_proto = skb->protocol;
err = 0;