--- zzzz-none-000/linux-4.19.183/net/socket.c	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/net/socket.c	2023-06-28 08:54:21.000000000 +0000
@@ -996,6 +996,9 @@
 	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;
@@ -1070,6 +1073,21 @@
 
 			err = open_related_ns(&net->ns, get_net_ns);
 			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;