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-rw-r--r--sysdeps/gnu/netinet/tcp.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/sysdeps/gnu/netinet/tcp.h b/sysdeps/gnu/netinet/tcp.h
index 06e8414b58..278fc9d8a5 100644
--- a/sysdeps/gnu/netinet/tcp.h
+++ b/sysdeps/gnu/netinet/tcp.h
@@ -173,7 +173,9 @@ enum
# define TCPI_OPT_TIMESTAMPS 1
# define TCPI_OPT_SACK 2
# define TCPI_OPT_WSCALE 4
-# define TCPI_OPT_ECN 8
+# define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */
+# define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
+# define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
/* Values for tcpi_state. */
enum tcp_ca_state