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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2023-06-14 13:02:02 +0300 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2023-06-16 11:29:50 +0300 |
| commit | f015b900bc3285322029b4a7d132d6aeb0e51857 (patch) | |
| tree | 74e9b1038bb936d0e2f16b2d8e98e9687a1ce24e /net/ipv4 | |
| parent | 842665a9008a53ff13ac22a4e4b8ae2f10e92aca (diff) | |
| download | linux-f015b900bc3285322029b4a7d132d6aeb0e51857.tar.xz | |
xfrm: Linearize the skb after offloading if needed.
With offloading enabled, esp_xmit() gets invoked very late, from within
validate_xmit_xfrm() which is after validate_xmit_skb() validates and
linearizes the skb if the underlying device does not support fragments.
esp_output_tail() may add a fragment to the skb while adding the auth
tag/ IV. Devices without the proper support will then send skb->data
points to with the correct length so the packet will have garbage at the
end. A pcap sniffer will claim that the proper data has been sent since
it parses the skb properly.
It is not affected with INET_ESP_OFFLOAD disabled.
Linearize the skb after offloading if the sending hardware requires it.
It was tested on v4, v6 has been adopted.
Fixes: 7785bba299a8d ("esp: Add a software GRO codepath")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/esp4_offload.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/esp4_offload.c b/net/ipv4/esp4_offload.c index 3969fa805679..ee848be59e65 100644 --- a/net/ipv4/esp4_offload.c +++ b/net/ipv4/esp4_offload.c @@ -340,6 +340,9 @@ static int esp_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_ secpath_reset(skb); + if (skb_needs_linearize(skb, skb->dev->features) && + __skb_linearize(skb)) + return -ENOMEM; return 0; } |