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xfrm: Fix double ESP trailer insertion in IPsec crypto offload.

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[ Upstream commit 94579ac3f6d0820adc83b5dc5358ead0158101e9 ]

During IPsec performance testing, we see bad ICMP checksum. The error packet
has duplicated ESP trailer due to double validate_xmit_xfrm calls. The first call
is from ip_output, but the packet cannot be sent because
netif_xmit_frozen_or_stopped is true and the packet gets dev_requeue_skb. The second
call is from NET_TX softirq. However after the first call, the packet already
has the ESP trailer.

Fix by marking the skb with XFRM_XMIT bit after the packet is handled by
validate_xmit_xfrm to avoid duplicate ESP trailer insertion.

Fixes: f6e27114a6 ("net: Add a xfrm validate function to validate_xmit_skb")
Signed-off-by: Huy Nguyen <[email protected]>
Reviewed-by: Boris Pismenny <[email protected]>
Reviewed-by: Raed Salem <[email protected]>
Reviewed-by: Saeed Mahameed <[email protected]>
Signed-off-by: Steffen Klassert <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Huy Nguyen 2020-06-01 16:39:37 -05:00 • committed by Sasha Levin
commit 41b2debf35
2 changed files with 4 additions and 1 deletions
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4
net/xfrm/xfrm_device.c
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@ -82,7 +82,7 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
struct xfrm_offload *xo = xfrm_offload(skb);
struct sec_path *sp;
if (!xo)
if (!xo || (xo->flags & XFRM_XMIT))
return skb;
if (!(features & NETIF_F_HW_ESP))
@ -103,6 +103,8 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur
return skb;
}
xo->flags |= XFRM_XMIT;
if (skb_is_gso(skb)) {
struct net_device *dev = skb->dev;