[PATCH 5.11 125/210] xfrm: Provide private skb extensions for segmented and hw offloaded ESP packets

Greg Kroah-Hartman
2021-04-12T09:33:01Z

From: Steffen Klassert <steffen.klassert@secunet.com>

[ Upstream commit c7dbf4c08868d9db89b8bfe8f8245ca61b01ed2f ]

Commit 94579ac3f6d0 ("xfrm: Fix double ESP trailer insertion in IPsec
crypto offload.") added a XFRM_XMIT flag to avoid duplicate ESP trailer
insertion on HW offload. This flag is set on the secpath that is shared
amongst segments. This lead to a situation where some segments are
not transformed correctly when segmentation happens at layer 3.

Fix this by using private skb extensions for segmented and hw offloaded
ESP packets.

Fixes: 94579ac3f6d0 ("xfrm: Fix double ESP trailer insertion in IPsec crypto offload.")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/ipv4/esp4_offload.c | 11 ++++++++++-
net/ipv6/esp6_offload.c | 11 ++++++++++-
net/xfrm/xfrm_device.c | 2 --
3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c
index d5c0f5a2a551..5aa7344dbec7 100644
--- a/net/ipv4/esp4_offload.c
+++ b/net/ipv4/esp4_offload.c
@@ -314,8 +314,17 @@ static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_
ip_hdr(skb)->tot_len = htons(skb->len);
ip_send_check(ip_hdr(skb));

- if (hw_offload)
+ if (hw_offload) {
+ if (!skb_ext_add(skb, SKB_EXT_SEC_PATH))
+ return -ENOMEM;
+
+ xo = xfrm_offload(skb);
+ if (!xo)
+ return -EINVAL;
+
+ xo->flags |= XFRM_XMIT;
return 0;
+ }

err = esp_output_tail(x, skb, &esp);
if (err)
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
index f35203ab39f5..4af56affaafd 100644
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c
@@ -348,8 +348,17 @@ static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features

ipv6_hdr(skb)->payload_len = htons(len);

- if (hw_offload)
+ if (hw_offload) {
+ if (!skb_ext_add(skb, SKB_EXT_SEC_PATH))
+ return -ENOMEM;
+
+ xo = xfrm_offload(skb);
+ if (!xo)
+ return -EINVAL;
+
+ xo->flags |= XFRM_XMIT;
return 0;
+ }

err = esp6_output_tail(x, skb, &esp);
if (err)
diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index edf11893dbe8..6d6917b68856 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -134,8 +134,6 @@ 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) && unlikely(x->xso.dev != dev)) {
struct sk_buff *segs;

--
2.30.2