--- zzzz-none-000/linux-4.4.271/net/ipv4/sysctl_net_ipv4.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/net/ipv4/sysctl_net_ipv4.c	2023-04-19 10:22:30.000000000 +0000
@@ -813,6 +813,13 @@
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= &one
 	},
+	{
+		.procname	= "ip_use_legacy_tos",
+		.data		= &sysctl_ip_use_legacy_tos,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
 	{ }
 };