+/* Values for tcpi_ecn_mode after negotiation */
+#define TCPI_ECN_MODE_DISABLED 0x0
+#define TCPI_ECN_MODE_RFC3168 0x1
+#define TCPI_ECN_MODE_ACCECN 0x2
+#define TCPI_ECN_MODE_PENDING 0x3
+
+/* Values for accecn_opt_seen */
+#define TCP_ACCECN_OPT_NOT_SEEN 0x0
+#define TCP_ACCECN_OPT_EMPTY_SEEN 0x1
+#define TCP_ACCECN_OPT_COUNTER_SEEN 0x2
+#define TCP_ACCECN_OPT_FAIL_SEEN 0x3
+
+/* Values for accecn_fail_mode */
+#define TCP_ACCECN_ACE_FAIL_SEND BIT(0)
+#define TCP_ACCECN_ACE_FAIL_RECV BIT(1)
+#define TCP_ACCECN_OPT_FAIL_SEND BIT(2)
+#define TCP_ACCECN_OPT_FAIL_RECV BIT(3)
+