1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index eeecb8547a2a..32d7d77b4a01 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -81,6 +81,12 @@ enum {
         TCP_DATA_OFFSET = __cpu_to_be32(0xF0000000)
 }; 
 
+/*
+ * TCP general constants
+ */
+#define TCP_MSS_DEFAULT          536U   /* IPv4 (RFC1122, RFC2581) */
+#define TCP_MSS_DESIRED         1220U   /* IPv6 (tunneled), EDNS0 (RFC3226) */
+
 /* TCP socket options */
 #define TCP_NODELAY             1       /* Turn off Nagle's algorithm. */
 #define TCP_MAXSEG              2       /* Limit MSS */