netdev - [PATCH net-next] ipv6: tcp: send consistent autoflowlabel in RST packets

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Date:   Thu, 22 Sep 2022 09:50:36 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Neal Cardwell <ncardwell@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next] ipv6: tcp: send consistent autoflowlabel in RST packets

From: Eric Dumazet <edumazet@...gle.com>

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

Fixes: aa51b80e1af4 ("ipv6: tcp: send consistent autoflowlabel in SYN_RECV state")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv6/tcp_ipv6.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 06beed4e23bf0cf6269ac03e60cfa4849c45ec76..a8adda623da15f9d396257c53d267c935e995be0 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/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:
-- 
2.37.3.998.g577e59143f-goog