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| author | Christian Langrock <christian.langrock@secunet.com> | 2022-10-17 08:34:47 +0200 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2022-10-19 09:00:53 +0200 |
| commit | 4b549ccce941798703f159b227aa28c716aa78fa (patch) | |
| tree | 3fa86e1058150975d089ffa94dfe041fede45d0a /net/xfrm/xfrm_device.c | |
| parent | d83f7040e18489265b4b121f33f99b02e52dabda (diff) | |
| download | lwn-4b549ccce941798703f159b227aa28c716aa78fa.tar.gz lwn-4b549ccce941798703f159b227aa28c716aa78fa.zip | |
xfrm: replay: Fix ESN wrap around for GSO
When using GSO it can happen that the wrong seq_hi is used for the last
packets before the wrap around. This can lead to double usage of a
sequence number. To avoid this, we should serialize this last GSO
packet.
Fixes: d7dbefc45cf5 ("xfrm: Add xfrm_replay_overflow functions for offloading")
Co-developed-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Christian Langrock <christian.langrock@secunet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_device.c')
| -rw-r--r-- | net/xfrm/xfrm_device.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c index 5f5aafd418af..21269e8f2db4 100644 --- a/net/xfrm/xfrm_device.c +++ b/net/xfrm/xfrm_device.c @@ -97,6 +97,18 @@ static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb) } } +static inline bool xmit_xfrm_check_overflow(struct sk_buff *skb) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + __u32 seq = xo->seq.low; + + seq += skb_shinfo(skb)->gso_segs; + if (unlikely(seq < xo->seq.low)) + return true; + + return false; +} + struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again) { int err; @@ -134,7 +146,8 @@ struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t featur return skb; } - if (skb_is_gso(skb) && unlikely(x->xso.dev != dev)) { + if (skb_is_gso(skb) && (unlikely(x->xso.dev != dev) || + unlikely(xmit_xfrm_check_overflow(skb)))) { struct sk_buff *segs; /* Packet got rerouted, fixup features and segment it. */ |