--- zzzz-none-000/linux-4.4.60/net/socket.c	2017-04-08 07:53:53.000000000 +0000
+++ jet-2400-727/linux-4.4.60/net/socket.c	2021-03-17 14:36:41.000000000 +0000
@@ -890,6 +890,9 @@
 	void __user *argp = (void __user *)arg;
 	int pid, err;
 	struct net *net;
+#ifdef CONFIG_AVM_SK_TC_INDEX
+	unsigned long tc_index;
+#endif
 
 	sock = file->private_data;
 	sk = sock->sk;
@@ -951,6 +954,21 @@
 				err = dlci_ioctl_hook(cmd, argp);
 			mutex_unlock(&dlci_ioctl_mutex);
 			break;
+
+#ifdef CONFIG_AVM_SK_TC_INDEX
+		case SIOCSET_TC_INDEX:
+			err = -EFAULT;
+			if (get_user(tc_index, (unsigned long __user *)argp))
+				break;
+			sock->sk->sk_tc_index = tc_index;
+			err = 0;
+			break;
+
+		case SIOCGET_TC_INDEX:
+			err = put_user(sock->sk->sk_tc_index, (unsigned long __user *)argp);
+			break;
+#endif
+
 		default:
 			err = sock_do_ioctl(net, sock, cmd, arg);
 			break;