On Thu, Jun 09, 2016 at 10:48:18PM +0800, Xin Long wrote:
> Now sctp doesn't change socket state upon shutdown reception. It changes
> just the assoc state, even though it's a TCP-style socket.
>
> For some cases, if we really need to check sk->sk_state, it's necessary to
> fix this issue, at least when we use ss or netstat to dump, we can get a
> more exact information.
>
> As an improvement, we will change sk->sk_state when we change asoc->state
> to SHUTDOWN_RECEIVED, and also do it in sctp_shutdown to keep consistent
> with sctp_close.
>
> Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Acked-by: Marcelo R. Leitner <marcelo.leitner@xxxxxxxxx>
> ---
> net/sctp/sm_sideeffect.c | 4 +++-
> net/sctp/socket.c | 8 ++++++--
> 2 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
> index aa37122..12d4519 100644
> --- a/net/sctp/sm_sideeffect.c
> +++ b/net/sctp/sm_sideeffect.c
> @@ -806,8 +806,10 @@ static void sctp_cmd_new_state(sctp_cmd_seq_t *cmds,
>
> /* Set the RCV_SHUTDOWN flag when a SHUTDOWN is received. */
> if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
> - sctp_sstate(sk, ESTABLISHED))
> + sctp_sstate(sk, ESTABLISHED)) {
> + sk->sk_state = SCTP_SS_CLOSING;
> sk->sk_shutdown |= RCV_SHUTDOWN;
> + }
> }
>
> if (sctp_state(asoc, COOKIE_WAIT)) {
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 67154b8..125ddcb 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -4193,6 +4193,7 @@ static void sctp_shutdown(struct sock *sk, int how)
> return;
>
> if (how & SEND_SHUTDOWN) {
> + sk->sk_state = SCTP_SS_CLOSING;
> ep = sctp_sk(sk)->ep;
> if (!list_empty(&ep->asocs)) {
> asoc = list_entry(ep->asocs.next,
> @@ -7564,10 +7565,13 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
> /* If the association on the newsk is already closed before accept()
> * is called, set RCV_SHUTDOWN flag.
> */
> - if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP))
> + if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
> + newsk->sk_state = SCTP_SS_CLOSING;
> newsk->sk_shutdown |= RCV_SHUTDOWN;
> + } else {
> + newsk->sk_state = SCTP_SS_ESTABLISHED;
> + }
>
> - newsk->sk_state = SCTP_SS_ESTABLISHED;
> release_sock(newsk);
> }
>
> --
> 2.1.0
>
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