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sctp: sctp should change socket state when shutdown is received

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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@gmail.com>
Acked-by: Marcelo R. Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2016-06-09 22:48:18 +08:00 committed by David S. Miller
parent d6cf3a85b4
commit d46e416c11
2 changed files with 9 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
net/sctp/sm_sideeffect.c
View file

@ -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)) {

8
net/sctp/socket.c
View file

@ -4195,6 +4195,7 @@ 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,
@ -7566,10 +7567,13 @@ 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);
}