This is a note to let you know that I've just added the patch titled
xfrm: Fix double ESP trailer insertion in IPsec crypto offload.
to the 5.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xfrm-fix-double-esp-trailer-insertion-in-ipsec-crypt.patch
and it can be found in the queue-5.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 53eceaf4a99cee09d9951353839344e7ff9ff924
Author: Huy Nguyen <huyn@xxxxxxxxxxxx>
Date: Mon Jun 1 16:39:37 2020 -0500
xfrm: Fix double ESP trailer insertion in IPsec crypto offload.
[ 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: f6e27114a60a ("net: Add a xfrm validate function to validate_xmit_skb")
Signed-off-by: Huy Nguyen <huyn@xxxxxxxxxxxx>
Reviewed-by: Boris Pismenny <borisp@xxxxxxxxxxxx>
Reviewed-by: Raed Salem <raeds@xxxxxxxxxxxx>
Reviewed-by: Saeed Mahameed <saeedm@xxxxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 8f71c111e65af..03024701c79f7 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1013,6 +1013,7 @@ struct xfrm_offload {
#define XFRM_GRO 32
#define XFRM_ESP_NO_TRAILER 64
#define XFRM_DEV_RESUME 128
+#define XFRM_XMIT 256
__u32 status;
#define CRYPTO_SUCCESS 1
diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index f50d1f97cf8ec..626096bd0d294 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -108,7 +108,7 @@ 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))
@@ -129,6 +129,8 @@ 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;
