From: Xin Long <lucien....@gmail.com> Date: Sat, 30 Jul 2016 14:09:09 +0800
> Prior to this patch, once sctp received SHUTDOWN or shutdown with RD, > sk->sk_shutdown would be set with RCV_SHUTDOWN, and all events would > be dropped in sctp_ulpq_tail_event(). It would cause: > > 1. some notifications couldn't be received by users. like > SCTP_SHUTDOWN_COMP generated by sctp_sf_do_4_C(). > > 2. sctp would also never trigger sk_data_ready when the association > was closed, making it harder to identify the end of the association > by calling recvmsg() and getting an EOF. It was not convenient for > kernel users. > > The check here should be stopping delivering DATA chunks after receiving > SHUTDOWN, and stopping delivering ANY chunks after sctp_close(). > > So this patch is to allow notifications to enqueue into receive queue > even if sk->sk_shutdown is set to RCV_SHUTDOWN in sctp_ulpq_tail_event, > but if sk->sk_shutdown == RCV_SHUTDOWN | SEND_SHUTDOWN, it drops all > events. > > Signed-off-by: Xin Long <lucien....@gmail.com> Applied.
