1 files changed, 10 insertions, 0 deletions

diff --git a/net/dccp/sysctl.c b/net/dccp/sysctl.c
index 1260aabac5e1..9364b2fb4dbd 100644
--- a/net/dccp/sysctl.c
+++ b/net/dccp/sysctl.c
@@ -18,6 +18,9 @@
 #error This file should not be compiled without CONFIG_SYSCTL defined
 #endif
 
+/* rate-limit for syncs in reply to sequence-invalid packets; RFC 4340, 7.5.4 */
+int sysctl_dccp_sync_ratelimit  __read_mostly = HZ / 8;
+
 static struct ctl_table dccp_default_table[] = {
         {
                 .procname       = "seq_window",
@@ -89,6 +92,13 @@ static struct ctl_table dccp_default_table[] = {
                 .mode           = 0644,
                 .proc_handler   = proc_dointvec,
         },
+        {
+                .procname       = "sync_ratelimit",
+                .data           = &sysctl_dccp_sync_ratelimit,
+                .maxlen         = sizeof(sysctl_dccp_sync_ratelimit),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec_ms_jiffies,
+        },
 
         { .ctl_name = 0, }
 };