On 12/04/2015 12:14 PM, Marcelo Ricardo Leitner wrote:
> SCTP echoes a cookie o INIT ACK chunks that contains a timestamp, for
> detecting stale cookies. This cookie is echoed back to the server by the
> client and then that timestamp is checked.
>
> Thing is, if the listening socket is using packet timestamping, the
> cookie is encoded with ktime_get() value and checked against
> ktime_get_real(), as done by __net_timestamp().
>
> The fix is to sctp also use ktime_get_real(), so we can compare bananas
> with bananas later no matter if packet timestamping was enabled or not.
>
> Fixes: 52db882f3fc2 ("net: sctp: migrate cookie life from timeval to ktime")
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
Acked-by: Vlad Yasevich <vyasevich@xxxxxxxxx>
-vlad
> ---
> net/sctp/sm_make_chunk.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index 763e06a55155b2a9e0a9d918ecc1fe2dd6d9e0c0..5d6a03fad3789a12290f5f14c5a7efa69c98f41a 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -1652,7 +1652,7 @@ static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
>
> /* Set an expiration time for the cookie. */
> cookie->c.expiration = ktime_add(asoc->cookie_life,
> - ktime_get());
> + ktime_get_real());
>
> /* Copy the peer's init packet. */
> memcpy(&cookie->c.peer_init[0], init_chunk->chunk_hdr,
> @@ -1780,7 +1780,7 @@ no_hmac:
> if (sock_flag(ep->base.sk, SOCK_TIMESTAMP))
> kt = skb_get_ktime(skb);
> else
> - kt = ktime_get();
> + kt = ktime_get_real();
>
> if (!asoc && ktime_before(bear_cookie->expiration, kt)) {
> /*
>
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