ipv6: tcp: send consistent autoflowlabel in RST packets

Blamed commit added a txhash parameter to tcp_v6_send_response()
but forgot to update tcp_v6_send_reset() accordingly.

Fixes: aa51b80e ("ipv6: tcp: send consistent autoflowlabel in SYN_RECV state")
Signed-off-by: NEric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20220922165036.1795862-1-eric.dumazet@gmail.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

net/ipv6/tcp_ipv6.c

@@ -1001,6 +1001,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 	__be32 label = 0;
 	u32 priority = 0;
 	struct net *net;
+	u32 txhash = 0;
 	int oif = 0;
 
 	if (th->rst)
@@ -1073,10 +1074,12 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 			if (np->repflow)
 				label = ip6_flowlabel(ipv6h);
 			priority = sk->sk_priority;
+			txhash = sk->sk_hash;
 		}
 		if (sk->sk_state == TCP_TIME_WAIT) {
 			label = cpu_to_be32(inet_twsk(sk)->tw_flowlabel);
 			priority = inet_twsk(sk)->tw_priority;
+			txhash = inet_twsk(sk)->tw_txhash;
 		}
 	} else {
 		if (net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_TCP_RESET)
@@ -1084,7 +1087,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
 	}
 
 	tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1,
-			     ipv6_get_dsfield(ipv6h), label, priority, 0);
+			     ipv6_get_dsfield(ipv6h), label, priority, txhash);
 
 #ifdef CONFIG_TCP_MD5SIG
 out: