[DCCP]: Add support for abortive release
This continues from the previous patch and adds support for actively aborting
a DCCP connection, using a Reset Code 2, "Aborted" to inform the peer of an
abortive release.
I have tried this in various client/server settings and it works as expected.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 5f47b45..73006b7 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -276,6 +276,12 @@
return inet_csk_listen_start(sk, backlog);
}
+static inline int dccp_need_reset(int state)
+{
+ return state != DCCP_CLOSED && state != DCCP_LISTEN &&
+ state != DCCP_REQUESTING;
+}
+
int dccp_disconnect(struct sock *sk, int flags)
{
struct inet_connection_sock *icsk = inet_csk(sk);
@@ -286,10 +292,15 @@
if (old_state != DCCP_CLOSED)
dccp_set_state(sk, DCCP_CLOSED);
- /* ABORT function of RFC793 */
+ /*
+ * This corresponds to the ABORT function of RFC793, sec. 3.8
+ * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted".
+ */
if (old_state == DCCP_LISTEN) {
inet_csk_listen_stop(sk);
- /* FIXME: do the active reset thing */
+ } else if (dccp_need_reset(old_state)) {
+ dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
+ sk->sk_err = ECONNRESET;
} else if (old_state == DCCP_REQUESTING)
sk->sk_err = ECONNRESET;