netdev - [PATCH net-next 5/6] tcp: rstreason: introduce SK_RST_REASON_TCP

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Message-Id: <20240730133513.99986-6-kerneljasonxing@gmail.com>
Date: Tue, 30 Jul 2024 21:35:12 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	dsahern@...nel.org
Cc: netdev@...r.kernel.org,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next 5/6] tcp: rstreason: introduce SK_RST_REASON_TCP_TIMEOUT for active reset

From: Jason Xing <kernelxing@...cent.com>

Only when user sets TCP_USER_TIMEOUT option and there is no left
chance to proceed, we will send an RST to the other side.

Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
 include/net/rstreason.h | 7 +++++++
 net/ipv4/tcp_timer.c    | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/net/rstreason.h b/include/net/rstreason.h
index fecaa57f1634..ca10aaebd768 100644
--- a/include/net/rstreason.h
+++ b/include/net/rstreason.h
@@ -21,6 +21,7 @@
 	FN(TCP_ABORT_ON_LINGER)		\
 	FN(TCP_ABORT_ON_MEMORY)		\
 	FN(TCP_STATE)			\
+	FN(TCP_TIMEOUT)			\
 	FN(MPTCP_RST_EUNSPEC)		\
 	FN(MPTCP_RST_EMPTCP)		\
 	FN(MPTCP_RST_ERESOURCE)		\
@@ -108,6 +109,12 @@ enum sk_rst_reason {
 	 * Please see RFC 793 for all possible reset conditions
 	 */
 	SK_RST_REASON_TCP_STATE,
+	/**
+	 * @SK_RST_REASON_TCP_TIMEOUT: time to timeout
+	 * When user sets TCP_USER_TIMEOUT options and run out of all the
+	 * chance, we have to reset the connection
+	 */
+	SK_RST_REASON_TCP_TIMEOUT,
 
 	/* Copy from include/uapi/linux/mptcp.h.
 	 * These reset fields will not be changed since they adhere to
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 3910f6d8614e..bd403300e4c4 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -807,7 +807,7 @@ static void tcp_keepalive_timer (struct timer_list *t)
 		    (user_timeout == 0 &&
 		    icsk->icsk_probes_out >= keepalive_probes(tp))) {
 			tcp_send_active_reset(sk, GFP_ATOMIC,
-					      SK_RST_REASON_NOT_SPECIFIED);
+					      SK_RST_REASON_TCP_TIMEOUT);
 			tcp_write_err(sk);
 			goto out;
 		}
-- 
2.37.3