1 files changed, 20 insertions, 0 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 649a36d99c73..a2bcac9b388e 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1833,6 +1833,19 @@ static int tcp_v4_init_sock(struct sock *sk)
         tp->af_specific = &tcp_sock_ipv4_specific;
 #endif
 
+        /* TCP Cookie Transactions */
+        if (sysctl_tcp_cookie_size > 0) {
+                /* Default, cookies without s_data_payload. */
+                tp->cookie_values =
+                        kzalloc(sizeof(*tp->cookie_values),
+                                sk->sk_allocation);
+                if (tp->cookie_values != NULL)
+                        kref_init(&tp->cookie_values->kref);
+        }
+        /* Presumed zeroed, in order of appearance:
+         *      cookie_in_always, cookie_out_never,
+         *      s_data_constant, s_data_in, s_data_out
+         */
         sk->sk_sndbuf = sysctl_tcp_wmem[1];
         sk->sk_rcvbuf = sysctl_tcp_rmem[1];
 
@@ -1886,6 +1899,13 @@ void tcp_v4_destroy_sock(struct sock *sk)
                 sk->sk_sndmsg_page = NULL;
         }
 
+        /* TCP Cookie Transactions */
+        if (tp->cookie_values != NULL) {
+                kref_put(&tp->cookie_values->kref,
+                         tcp_cookie_values_release);
+                tp->cookie_values = NULL;
+        }
+
         percpu_counter_dec(&tcp_sockets_allocated);
 }