[PATCH net-next 3/3] xfrm: Determine inner GSO type from packet inner protocol

[Jianbo Liu <jianbol@nvidia.com>]

The GSO segmentation functions for ESP tunnel mode
(xfrm4_tunnel_gso_segment and xfrm6_tunnel_gso_segment) were
determining the inner packet's L2 protocol type by checking the static
x->inner_mode.family field from the xfrm state.

This is unreliable. In tunnel mode, the state's actual inner family
could be defined by x->inner_mode.family or by
x->inner_mode_iaf.family. Checking only the former can lead to a
mismatch with the actual packet being processed, causing GSO to create
segments with the wrong L2 header type.

This patch fixes the bug by deriving the inner mode directly from the
packet's inner protocol stored in XFRM_MODE_SKB_CB(skb)->protocol.

Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
---
 net/ipv4/esp4_offload.c | 6 ++++--
 net/ipv6/esp6_offload.c | 6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index e0d94270da28..05828d4cb6cd 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -122,8 +122,10 @@ static struct sk_buff *xfrm4_tunnel_gso_segment(struct xfrm_state *x,
 						struct sk_buff *skb,
 						netdev_features_t features)
 {
-	__be16 type = x->inner_mode.family == AF_INET6 ? htons(ETH_P_IPV6)
-						       : htons(ETH_P_IP);
+	const struct xfrm_mode *inner_mode = xfrm_ip2inner_mode(x,
+					XFRM_MODE_SKB_CB(skb)->protocol);
+	__be16 type = inner_mode->family == AF_INET6 ? htons(ETH_P_IPV6)
+						     : htons(ETH_P_IP);
 
 	return skb_eth_gso_segment(skb, features, type);
 }
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
index 7b41fb4f00b5..22410243ebe8 100644
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c
@@ -158,8 +158,10 @@ static struct sk_buff *xfrm6_tunnel_gso_segment(struct xfrm_state *x,
 						struct sk_buff *skb,
 						netdev_features_t features)
 {
-	__be16 type = x->inner_mode.family == AF_INET ? htons(ETH_P_IP)
-						      : htons(ETH_P_IPV6);
+	const struct xfrm_mode *inner_mode = xfrm_ip2inner_mode(x,
+					XFRM_MODE_SKB_CB(skb)->protocol);
+	__be16 type = inner_mode->family == AF_INET ? htons(ETH_P_IP)
+						    : htons(ETH_P_IPV6);
 
 	return skb_eth_gso_segment(skb, features, type);
 }
-- 
2.49.0