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xfrm: replay: Fix the update of replay_esn->oseq_hi for GSO

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When skb needs GSO and wrap around happens, if xo->seq.low (seqno of
the first skb segment) is before the last seq number but oseq (seqno
of the last segment) is after it, xo->seq.low is still bigger than
replay_esn->oseq while oseq is smaller than it, so the update of
replay_esn->oseq_hi is missed for this case wrap around because of
the change in the cited commit.

For example, if sending a packet with gso_segs=3 while old
replay_esn->oseq=0xfffffffe, we calculate:
    xo->seq.low = 0xfffffffe + 1 = 0x0xffffffff
    oseq = 0xfffffffe + 3 = 0x1
(oseq < replay_esn->oseq) is true, but (xo->seq.low <
replay_esn->oseq) is false, so replay_esn->oseq_hi is not incremented.

To fix this issue, change the outer checking back for the update of
replay_esn->oseq_hi. And add new checking inside for the update of
packet's oseq_hi.

Fixes: 4b549ccce9 ("xfrm: replay: Fix ESN wrap around for GSO")
Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Reviewed-by: Patrisious Haddad <phaddad@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Jianbo Liu 2024-11-12 14:10:31 +02:00 committed by Steffen Klassert
parent 9bb88c6596
commit c05c5e5aa1
1 changed files with 6 additions and 4 deletions
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10
net/xfrm/xfrm_replay.c
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@ -714,10 +714,12 @@ static int xfrm_replay_overflow_offload_esn(struct xfrm_state *x, struct sk_buff
oseq += skb_shinfo(skb)->gso_segs;
}
if (unlikely(xo->seq.low < replay_esn->oseq)) {
XFRM_SKB_CB(skb)->seq.output.hi = ++oseq_hi;
xo->seq.hi = oseq_hi;
replay_esn->oseq_hi = oseq_hi;
if (unlikely(oseq < replay_esn->oseq)) {
replay_esn->oseq_hi = ++oseq_hi;
if (xo->seq.low < replay_esn->oseq) {
XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi;
xo->seq.hi = oseq_hi;
}
if (replay_esn->oseq_hi == 0) {
replay_esn->oseq--;
replay_esn->oseq_hi--;