mptcp: MP_FAIL suboption sending
This patch added the MP_FAIL suboption sending support.
Add a new flag named send_mp_fail in struct mptcp_subflow_context. If
this flag is set, send out MP_FAIL suboption.
Add a new member fail_seq in struct mptcp_out_options to save the data
sequence number to put into the MP_FAIL suboption.
An MP_FAIL option could be included in a RST or on the subflow-level
ACK.
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Geliang Tang <geliangtang@xiaomi.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index d276ce1..3e4a79c 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -27,6 +27,7 @@
#define OPTION_MPTCP_PRIO BIT(9)
#define OPTION_MPTCP_RST BIT(10)
#define OPTION_MPTCP_DSS BIT(11)
+#define OPTION_MPTCP_FAIL BIT(12)
/* MPTCP option subtypes */
#define MPTCPOPT_MP_CAPABLE 0
@@ -68,6 +69,7 @@
#define TCPOLEN_MPTCP_PRIO_ALIGN 4
#define TCPOLEN_MPTCP_FASTCLOSE 12
#define TCPOLEN_MPTCP_RST 4
+#define TCPOLEN_MPTCP_FAIL 12
#define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)
@@ -429,6 +431,7 @@ struct mptcp_subflow_context {
mpc_map : 1,
backup : 1,
send_mp_prio : 1,
+ send_mp_fail : 1,
rx_eof : 1,
can_ack : 1, /* only after processing the remote a key */
disposable : 1, /* ctx can be free at ulp release time */