--- zzzz-none-000/linux-4.1.52/net/sctp/output.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/net/sctp/output.c	2022-03-02 11:37:14.000000000 +0000
@@ -363,6 +363,10 @@
 	skb->sk = sk;
 	skb->destructor = sctp_packet_release_owner;
 
+#ifdef CONFIG_AVM_SK_TC_INDEX
+	skb->tc_index = sk->sk_tc_index;
+#endif
+
 	/*
 	 * The data chunks have already been accounted for in sctp_sendmsg(),
 	 * therefore only reserve a single byte to keep socket around until