sctp: handle association restarts when the socket is closed.

[firefly-linux-kernel-4.4.55.git] / net / sctp / sm_statefuns.c

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 6eb26403de6a7d9b9b0103ed8fc58a9534dfec04..edc204b05c825b1b8a97f0d37c049a1b5d75c008 100644 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -1782,9 +1782,22 @@ static sctp_disposition_t sctp_sf_do_dupcook_a(struct net *net,
        /* Update the content of current association. */
        sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_ASSOC, SCTP_ASOC(new_asoc));
        sctp_add_cmd_sf(commands, SCTP_CMD_EVENT_ULP, SCTP_ULPEVENT(ev));
-       sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
-                       SCTP_STATE(SCTP_STATE_ESTABLISHED));
-       sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
+       if (sctp_state(asoc, SHUTDOWN_PENDING) &&
+           (sctp_sstate(asoc->base.sk, CLOSING) ||
+            sock_flag(asoc->base.sk, SOCK_DEAD))) {
+               /* if were currently in SHUTDOWN_PENDING, but the socket
+                * has been closed by user, don't transition to ESTABLISHED.
+                * Instead trigger SHUTDOWN bundled with COOKIE_ACK.
+                */
+               sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
+               return sctp_sf_do_9_2_start_shutdown(net, ep, asoc,
+                                                    SCTP_ST_CHUNK(0), NULL,
+                                                    commands);
+       } else {
+               sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
+                               SCTP_STATE(SCTP_STATE_ESTABLISHED));
+               sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
+       }
        return SCTP_DISPOSITION_CONSUME;
 
 nomem_ev: