[PATCH ipsec-next] esp: check the NETIF_F_HW_ESP_TX_CSUM bit before segmenting

[Shannon Nelson]

If I understand correctly, we should not be asking for a
checksum offload on an ipsec packet if the netdev isn't
advertising NETIF_F_HW_ESP_TX_CSUM.  In that case, we should
clear the NETIF_F_CSUM_MASK bits.

Signed-off-by: Shannon Nelson <shannon.nel...@oracle.com>
---
 net/ipv4/esp4_offload.c | 2 ++
 net/ipv6/esp6_offload.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index da5635f..7cf755e 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -138,6 +138,8 @@ static struct sk_buff *esp4_gso_segment(struct sk_buff *skb,
        if (!(features & NETIF_F_HW_ESP) || !x->xso.offload_handle ||
            (x->xso.dev != skb->dev))
                esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
+       else if (!(features & NETIF_F_HW_ESP_TX_CSUM))
+               esp_features = features & ~NETIF_F_CSUM_MASK;
 
        xo->flags |= XFRM_GSO_SEGMENT;
 
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
index 3fd1ec7..27f59b6 100644
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c
@@ -165,6 +165,8 @@ static struct sk_buff *esp6_gso_segment(struct sk_buff *skb,
        if (!(features & NETIF_F_HW_ESP) || !x->xso.offload_handle ||
            (x->xso.dev != skb->dev))
                esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
+       else if (!(features & NETIF_F_HW_ESP_TX_CSUM))
+               esp_features = features & ~NETIF_F_CSUM_MASK;
 
        xo->flags |= XFRM_GSO_SEGMENT;
 
-- 
2.7.4