--- zzzz-none-000/linux-3.10.107/net/sctp/output.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/net/sctp/output.c	2021-11-10 11:53:56.000000000 +0000
@@ -373,6 +373,9 @@
 	skb_orphan(skb);
 	skb->sk = sk;
 	skb->destructor = sctp_packet_release_owner;
+#ifdef CONFIG_NET_SCHED
+	skb->tc_index = sk->sk_tc_index;
+#endif
 
 	/*
 	 * The data chunks have already been accounted for in sctp_sendmsg(),