--- zzzz-none-000/linux-5.4.213/net/ipv4/tcp_output.c	2022-09-15 10:04:56.000000000 +0000
+++ miami-7690-761/linux-5.4.213/net/ipv4/tcp_output.c	2024-05-29 11:20:02.000000000 +0000
@@ -1106,6 +1106,10 @@
 
 	skb_set_dst_pending_confirm(skb, sk->sk_dst_pending_confirm);
 
+#ifdef CONFIG_AVM_SK_TC_INDEX
+	skb->tc_index = sk->sk_tc_index;
+#endif
+
 	/* Build TCP header and checksum it. */
 	th = (struct tcphdr *)skb->data;
 	th->source		= inet->inet_sport;
@@ -1350,6 +1354,10 @@
 	buff->truesize += nlen;
 	skb->truesize -= nlen;
 
+#ifdef CONFIG_AVM_SK_TC_INDEX
+	skb->tc_index = sk->sk_tc_index;
+#endif
+
 	/* Correct the sequence numbers. */
 	TCP_SKB_CB(buff)->seq = TCP_SKB_CB(skb)->seq + len;
 	TCP_SKB_CB(buff)->end_seq = TCP_SKB_CB(skb)->end_seq;