1 files changed, 14 insertions, 0 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index c7fc10724948..98ac0d7552a1 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1514,6 +1514,20 @@ cookie_preserve_enable - BOOLEAN
 
         Default: 1
 
+cookie_hmac_alg - STRING
+        Select the hmac algorithm used when generating the cookie value sent by
+        a listening sctp socket to a connecting client in the INIT-ACK chunk.
+        Valid values are:
+        * md5
+        * sha1
+        * none
+        Ability to assign md5 or sha1 as the selected alg is predicated on the
+        configuarion of those algorithms at build time (CONFIG_CRYPTO_MD5 and
+        CONFIG_CRYPTO_SHA1).
+
+        Default: Dependent on configuration.  MD5 if available, else SHA1 if
+        available, else none.
+
 rcvbuf_policy - INTEGER
         Determines if the receive buffer is attributed to the socket or to
         association.   SCTP supports the capability to create multiple