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tcp: mark skbs with SCM_TIMESTAMPING_OPT_STATS

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SOF_TIMESTAMPING_OPT_STATS can be enabled and disabled
while packets are collected on the error queue.
So, checking SOF_TIMESTAMPING_OPT_STATS in sk->sk_tsflags
is not enough to safely assume that the skb contains
OPT_STATS data.

Add a bit in sock_exterr_skb to indicate whether the
skb contains opt_stats data.

Fixes: 1c885808e4 ("tcp: SOF_TIMESTAMPING_OPT_STATS option for SO_TIMESTAMPING")
Reported-by: JongHwan Kim <[email protected]>
Signed-off-by: Soheil Hassas Yeganeh <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Soheil Hassas Yeganeh 2017-03-18 17:03:00 -04:00 • committed by David S. Miller
commit 4ef1b28694
3 changed files with 14 additions and 7 deletions
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2
net/socket.c
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@ -706,7 +706,7 @@ void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
SCM_TIMESTAMPING, sizeof(tss), &tss);
if (skb_is_err_queue(skb) && skb->len &&
(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS))
SKB_EXT_ERR(skb)->opt_stats)
put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS,
skb->len, skb->data);
}