[PATCH net-next v3 0/7] tcp: completely support active reset

[PATCH net-next v3 0/7] tcp: completely support active reset

[Jason Xing]

From: Jason Xing <kernelxing@tencent.com>

This time the patch series finally covers all the cases in the active
reset logic. After this, we can know the related exact reason(s).

v3
Link: https://lore.kernel.org/all/20240731120955.23542-1-kerneljasonxing@gmail.com/
1. introduce TCP_DISCONNECT_WITH_DATA reason (Eric)
2. use a better name 'TCP_KEEPALIVE_TIMEOUT' (Eric)
3. add three reviewed-by tags (Eric)

v2
Link: https://lore.kernel.org/all/20240730133513.99986-1-kerneljasonxing@gmail.com/
1. use RFC 9293 in the comment and changelog instead of old RFC 793
2. correct the comment and changelog in patch 5

Jason Xing (7):
  tcp: rstreason: introduce SK_RST_REASON_TCP_ABORT_ON_CLOSE for active
    reset
  tcp: rstreason: introduce SK_RST_REASON_TCP_ABORT_ON_LINGER for active
    reset
  tcp: rstreason: introduce SK_RST_REASON_TCP_ABORT_ON_MEMORY for active
    reset
  tcp: rstreason: introduce SK_RST_REASON_TCP_STATE for active reset
  tcp: rstreason: introduce SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT for
    active reset
  tcp: rstreason: introduce SK_RST_REASON_TCP_DISCONNECT_WITH_DATA for
    active reset
  tcp: rstreason: let it work finally in tcp_send_active_reset()

 include/net/rstreason.h | 39 +++++++++++++++++++++++++++++++++++++++
 net/ipv4/tcp.c          | 19 +++++++++++--------
 net/ipv4/tcp_output.c   |  2 +-
 net/ipv4/tcp_timer.c    |  6 +++---
 4 files changed, 54 insertions(+), 12 deletions(-)

-- 
2.37.3

[PATCH net-next v3 1/7] tcp: rstreason: introduce SK_RST_REASON_TCP_ABORT_ON_CLOSE for active reset

[Jason Xing]

From: Jason Xing <kernelxing@tencent.com>

Introducing a new type TCP_ABORT_ON_CLOSE for tcp reset reason to handle
the case where more data is unread in closing phase.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
---
 include/net/rstreason.h | 6 ++++++
 net/ipv4/tcp.c          | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/net/rstreason.h b/include/net/rstreason.h
index 2575c85d7f7a..fa6bfd0d7d69 100644
--- a/include/net/rstreason.h
+++ b/include/net/rstreason.h
@@ -17,6 +17,7 @@
 	FN(TCP_ABORT_ON_DATA)		\
 	FN(TCP_TIMEWAIT_SOCKET)		\
 	FN(INVALID_SYN)			\
+	FN(TCP_ABORT_ON_CLOSE)		\
 	FN(MPTCP_RST_EUNSPEC)		\
 	FN(MPTCP_RST_EMPTCP)		\
 	FN(MPTCP_RST_ERESOURCE)		\
@@ -84,6 +85,11 @@ enum sk_rst_reason {
 	 * an error, send a reset"
 	 */
 	SK_RST_REASON_INVALID_SYN,
+	/**
+	 * @SK_RST_REASON_TCP_ABORT_ON_CLOSE: abort on close
+	 * corresponding to LINUX_MIB_TCPABORTONCLOSE
+	 */
+	SK_RST_REASON_TCP_ABORT_ON_CLOSE,
 
 	/* Copy from include/uapi/linux/mptcp.h.
 	 * These reset fields will not be changed since they adhere to
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index e03a342c9162..2e010add0317 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2833,7 +2833,7 @@ void __tcp_close(struct sock *sk, long timeout)
 		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONCLOSE);
 		tcp_set_state(sk, TCP_CLOSE);
 		tcp_send_active_reset(sk, sk->sk_allocation,
-				      SK_RST_REASON_NOT_SPECIFIED);
+				      SK_RST_REASON_TCP_ABORT_ON_CLOSE);
 	} else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
 		/* Check zero linger _after_ checking for unread data. */
 		sk->sk_prot->disconnect(sk, 0);
-- 
2.37.3

[PATCH net-next v3 2/7] tcp: rstreason: introduce SK_RST_REASON_TCP_ABORT_ON_LINGER for active reset

[Jason Xing]

From: Jason Xing <kernelxing@tencent.com>

Introducing a new type TCP_ABORT_ON_LINGER for tcp reset reason to handle
negative linger value case.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
---
 include/net/rstreason.h | 6 ++++++
 net/ipv4/tcp.c          | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/net/rstreason.h b/include/net/rstreason.h
index fa6bfd0d7d69..fbbaeb969e6a 100644
--- a/include/net/rstreason.h
+++ b/include/net/rstreason.h
@@ -18,6 +18,7 @@
 	FN(TCP_TIMEWAIT_SOCKET)		\
 	FN(INVALID_SYN)			\
 	FN(TCP_ABORT_ON_CLOSE)		\
+	FN(TCP_ABORT_ON_LINGER)		\
 	FN(MPTCP_RST_EUNSPEC)		\
 	FN(MPTCP_RST_EMPTCP)		\
 	FN(MPTCP_RST_ERESOURCE)		\
@@ -90,6 +91,11 @@ enum sk_rst_reason {
 	 * corresponding to LINUX_MIB_TCPABORTONCLOSE
 	 */
 	SK_RST_REASON_TCP_ABORT_ON_CLOSE,
+	/**
+	 * @SK_RST_REASON_TCP_ABORT_ON_LINGER: abort on linger
+	 * corresponding to LINUX_MIB_TCPABORTONLINGER
+	 */
+	SK_RST_REASON_TCP_ABORT_ON_LINGER,
 
 	/* Copy from include/uapi/linux/mptcp.h.
 	 * These reset fields will not be changed since they adhere to
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 2e010add0317..5b0f1d1fc697 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2908,7 +2908,7 @@ void __tcp_close(struct sock *sk, long timeout)
 		if (READ_ONCE(tp->linger2) < 0) {
 			tcp_set_state(sk, TCP_CLOSE);
 			tcp_send_active_reset(sk, GFP_ATOMIC,
-					      SK_RST_REASON_NOT_SPECIFIED);
+					      SK_RST_REASON_TCP_ABORT_ON_LINGER);
 			__NET_INC_STATS(sock_net(sk),
 					LINUX_MIB_TCPABORTONLINGER);
 		} else {
-- 
2.37.3

[PATCH net-next v3 3/7] tcp: rstreason: introduce SK_RST_REASON_TCP_ABORT_ON_MEMORY for active reset

[Jason Xing]

From: Jason Xing <kernelxing@tencent.com>

Introducing a new type TCP_ABORT_ON_MEMORY for tcp reset reason to handle
out of memory case.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
---
 include/net/rstreason.h | 6 ++++++
 net/ipv4/tcp.c          | 2 +-
 net/ipv4/tcp_timer.c    | 2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/net/rstreason.h b/include/net/rstreason.h
index fbbaeb969e6a..eef658da8952 100644
--- a/include/net/rstreason.h
+++ b/include/net/rstreason.h
@@ -19,6 +19,7 @@
 	FN(INVALID_SYN)			\
 	FN(TCP_ABORT_ON_CLOSE)		\
 	FN(TCP_ABORT_ON_LINGER)		\
+	FN(TCP_ABORT_ON_MEMORY)		\
 	FN(MPTCP_RST_EUNSPEC)		\
 	FN(MPTCP_RST_EMPTCP)		\
 	FN(MPTCP_RST_ERESOURCE)		\
@@ -96,6 +97,11 @@ enum sk_rst_reason {
 	 * corresponding to LINUX_MIB_TCPABORTONLINGER
 	 */
 	SK_RST_REASON_TCP_ABORT_ON_LINGER,
+	/**
+	 * @SK_RST_REASON_TCP_ABORT_ON_MEMORY: abort on memory
+	 * corresponding to LINUX_MIB_TCPABORTONMEMORY
+	 */
+	SK_RST_REASON_TCP_ABORT_ON_MEMORY,
 
 	/* Copy from include/uapi/linux/mptcp.h.
 	 * These reset fields will not be changed since they adhere to
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 5b0f1d1fc697..fd928c447ce8 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2927,7 +2927,7 @@ void __tcp_close(struct sock *sk, long timeout)
 		if (tcp_check_oom(sk, 0)) {
 			tcp_set_state(sk, TCP_CLOSE);
 			tcp_send_active_reset(sk, GFP_ATOMIC,
-					      SK_RST_REASON_NOT_SPECIFIED);
+					      SK_RST_REASON_TCP_ABORT_ON_MEMORY);
 			__NET_INC_STATS(sock_net(sk),
 					LINUX_MIB_TCPABORTONMEMORY);
 		} else if (!check_net(sock_net(sk))) {
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 4d40615dc8fc..0fba4a4fb988 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -125,7 +125,7 @@ static int tcp_out_of_resources(struct sock *sk, bool do_reset)
 			do_reset = true;
 		if (do_reset)
 			tcp_send_active_reset(sk, GFP_ATOMIC,
-					      SK_RST_REASON_NOT_SPECIFIED);
+					      SK_RST_REASON_TCP_ABORT_ON_MEMORY);
 		tcp_done(sk);
 		__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONMEMORY);
 		return 1;
-- 
2.37.3

[PATCH net-next v3 4/7] tcp: rstreason: introduce SK_RST_REASON_TCP_STATE for active reset

[Jason Xing]

From: Jason Xing <kernelxing@tencent.com>

Introducing a new type TCP_STATE to handle some reset conditions
appearing in RFC 793 due to its socket state. Actually, we can look
into RFC 9293 which has no discrepancy about this part.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
---
v3
Link: https://lore.kernel.org/all/20240731120955.23542-5-kerneljasonxing@gmail.com/
1. remove one case from tcp_disconnect, which will be separately
categorized as another reason in the later patch (Eric)

V2
Link: https://lore.kernel.org/all/20240730200633.93761-1-kuniyu@amazon.com/
1. use RFC 9293 instead of RFC 793 which is too old (Kuniyuki)
---
 include/net/rstreason.h |  6 ++++++
 net/ipv4/tcp.c          | 10 ++++++----
 net/ipv4/tcp_timer.c    |  2 +-
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/include/net/rstreason.h b/include/net/rstreason.h
index eef658da8952..bbf20d0bbde7 100644
--- a/include/net/rstreason.h
+++ b/include/net/rstreason.h
@@ -20,6 +20,7 @@
 	FN(TCP_ABORT_ON_CLOSE)		\
 	FN(TCP_ABORT_ON_LINGER)		\
 	FN(TCP_ABORT_ON_MEMORY)		\
+	FN(TCP_STATE)			\
 	FN(MPTCP_RST_EUNSPEC)		\
 	FN(MPTCP_RST_EMPTCP)		\
 	FN(MPTCP_RST_ERESOURCE)		\
@@ -102,6 +103,11 @@ enum sk_rst_reason {
 	 * corresponding to LINUX_MIB_TCPABORTONMEMORY
 	 */
 	SK_RST_REASON_TCP_ABORT_ON_MEMORY,
+	/**
+	 * @SK_RST_REASON_TCP_STATE: abort on tcp state
+	 * Please see RFC 9293 for all possible reset conditions
+	 */
+	SK_RST_REASON_TCP_STATE,
 
 	/* Copy from include/uapi/linux/mptcp.h.
 	 * These reset fields will not be changed since they adhere to
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index fd928c447ce8..24777e48bcc8 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3025,9 +3025,11 @@ int tcp_disconnect(struct sock *sk, int flags)
 		inet_csk_listen_stop(sk);
 	} else if (unlikely(tp->repair)) {
 		WRITE_ONCE(sk->sk_err, ECONNABORTED);
-	} else if (tcp_need_reset(old_state) ||
-		   (tp->snd_nxt != tp->write_seq &&
-		    (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) {
+	} else if (tcp_need_reset(old_state)) {
+		tcp_send_active_reset(sk, gfp_any(), SK_RST_REASON_TCP_STATE);
+		WRITE_ONCE(sk->sk_err, ECONNRESET);
+	} else if (tp->snd_nxt != tp->write_seq &&
+		   (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK)) {
 		/* The last check adjusts for discrepancy of Linux wrt. RFC
 		 * states
 		 */
@@ -4649,7 +4651,7 @@ int tcp_abort(struct sock *sk, int err)
 	if (!sock_flag(sk, SOCK_DEAD)) {
 		if (tcp_need_reset(sk->sk_state))
 			tcp_send_active_reset(sk, GFP_ATOMIC,
-					      SK_RST_REASON_NOT_SPECIFIED);
+					      SK_RST_REASON_TCP_STATE);
 		tcp_done_with_error(sk, err);
 	}
 
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 0fba4a4fb988..3910f6d8614e 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -779,7 +779,7 @@ static void tcp_keepalive_timer (struct timer_list *t)
 				goto out;
 			}
 		}
-		tcp_send_active_reset(sk, GFP_ATOMIC, SK_RST_REASON_NOT_SPECIFIED);
+		tcp_send_active_reset(sk, GFP_ATOMIC, SK_RST_REASON_TCP_STATE);
 		goto death;
 	}
 
-- 
2.37.3

[PATCH net-next v3 5/7] tcp: rstreason: introduce SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT for active reset

[Jason Xing]

From: Jason Xing <kernelxing@tencent.com>

When we find keepalive timeout here, we should send an RST to the
other side.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
---
v3
Link: https://lore.kernel.org/all/20240731120955.23542-6-kerneljasonxing@gmail.com/
1. chose a better reason name (Eric)

v2
Link: https://lore.kernel.org/all/CAL+tcoB-12pUS0adK8M_=C97aXewYYmDA6rJKLXvAXEHvEsWjA@mail.gmail.com/
1. correct the comment and changelog
---
 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 bbf20d0bbde7..9c0c46df0e73 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_KEEPALIVE_TIMEOUT)	\
 	FN(MPTCP_RST_EUNSPEC)		\
 	FN(MPTCP_RST_EMPTCP)		\
 	FN(MPTCP_RST_ERESOURCE)		\
@@ -108,6 +109,12 @@ enum sk_rst_reason {
 	 * Please see RFC 9293 for all possible reset conditions
 	 */
 	SK_RST_REASON_TCP_STATE,
+	/**
+	 * @SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT: time to timeout
+	 * When we have already run out of all the chances, which means
+	 * keepalive timeout, we have to reset the connection
+	 */
+	SK_RST_REASON_TCP_KEEPALIVE_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..86169127e4d1 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_KEEPALIVE_TIMEOUT);
 			tcp_write_err(sk);
 			goto out;
 		}
-- 
2.37.3

[PATCH net-next v3 6/7] tcp: rstreason: introduce SK_RST_REASON_TCP_DISCONNECT_WITH_DATA for active reset

[Jason Xing]

From: Jason Xing <kernelxing@tencent.com>

When user tries to disconnect a socket and there are more data written
into tcp write queue, we have to send an RST.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
--
v3
Link: Link: https://lore.kernel.org/all/20240731120955.23542-5-kerneljasonxing@gmail.com/
1. This case is different from previous patch, so we need to write
it into a new patch. (Eric)
---
 include/net/rstreason.h | 8 ++++++++
 net/ipv4/tcp.c          | 3 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/net/rstreason.h b/include/net/rstreason.h
index 9c0c46df0e73..69cb2e52b7da 100644
--- a/include/net/rstreason.h
+++ b/include/net/rstreason.h
@@ -22,6 +22,7 @@
 	FN(TCP_ABORT_ON_MEMORY)		\
 	FN(TCP_STATE)			\
 	FN(TCP_KEEPALIVE_TIMEOUT)	\
+	FN(TCP_DISCONNECT_WITH_DATA)	\
 	FN(MPTCP_RST_EUNSPEC)		\
 	FN(MPTCP_RST_EMPTCP)		\
 	FN(MPTCP_RST_ERESOURCE)		\
@@ -115,6 +116,13 @@ enum sk_rst_reason {
 	 * keepalive timeout, we have to reset the connection
 	 */
 	SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT,
+	/**
+	 * @SK_RST_REASON_TCP_DISCONNECT_WITH_DATA: disconnect when write
+	 * queue is not empty
+	 * It means user has written data into the write queue when doing
+	 * disconnecting, so we have to send an RST.
+	 */
+	SK_RST_REASON_TCP_DISCONNECT_WITH_DATA,
 
 	/* Copy from include/uapi/linux/mptcp.h.
 	 * These reset fields will not be changed since they adhere to
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 24777e48bcc8..8514257f4ecd 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3033,7 +3033,8 @@ int tcp_disconnect(struct sock *sk, int flags)
 		/* The last check adjusts for discrepancy of Linux wrt. RFC
 		 * states
 		 */
-		tcp_send_active_reset(sk, gfp_any(), SK_RST_REASON_NOT_SPECIFIED);
+		tcp_send_active_reset(sk, gfp_any(),
+				      SK_RST_REASON_TCP_DISCONNECT_WITH_DATA);
 		WRITE_ONCE(sk->sk_err, ECONNRESET);
 	} else if (old_state == TCP_SYN_SENT)
 		WRITE_ONCE(sk->sk_err, ECONNRESET);
-- 
2.37.3

[PATCH net-next v3 7/7] tcp: rstreason: let it work finally in tcp_send_active_reset()

[Jason Xing]

From: Jason Xing <kernelxing@tencent.com>

Now it's time to let it work by using the 'reason' parameter in
the trace world :)

Signed-off-by: Jason Xing <kernelxing@tencent.com>
---
 net/ipv4/tcp_output.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 16c48df8df4c..cdd0def14427 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -3649,7 +3649,7 @@ void tcp_send_active_reset(struct sock *sk, gfp_t priority,
 	/* skb of trace_tcp_send_reset() keeps the skb that caused RST,
 	 * skb here is different to the troublesome skb, so use NULL
 	 */
-	trace_tcp_send_reset(sk, NULL, SK_RST_REASON_NOT_SPECIFIED);
+	trace_tcp_send_reset(sk, NULL, reason);
 }
 
 /* Send a crossed SYN-ACK during socket establishment.
-- 
2.37.3

Re: [PATCH net-next v3 6/7] tcp: rstreason: introduce SK_RST_REASON_TCP_DISCONNECT_WITH_DATA for active reset

[Eric Dumazet]

On Thu, Aug 1, 2024 at 4:55 PM Jason Xing <kerneljasonxing@gmail.com> wrote:
>
> From: Jason Xing <kernelxing@tencent.com>
>
> When user tries to disconnect a socket and there are more data written
> into tcp write queue, we have to send an RST.
>
> Signed-off-by: Jason Xing <kernelxing@tencent.com>

Reviewed-by: Eric Dumazet <edumazet@google.com>

Re: [PATCH net-next v3 7/7] tcp: rstreason: let it work finally in tcp_send_active_reset()

[Eric Dumazet]

On Thu, Aug 1, 2024 at 4:55 PM Jason Xing <kerneljasonxing@gmail.com> wrote:
>
> From: Jason Xing <kernelxing@tencent.com>
>
> Now it's time to let it work by using the 'reason' parameter in
> the trace world :)
>
> Signed-off-by: Jason Xing <kernelxing@tencent.com>
> ---
>  net/ipv4/tcp_output.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
> index 16c48df8df4c..cdd0def14427 100644
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -3649,7 +3649,7 @@ void tcp_send_active_reset(struct sock *sk, gfp_t priority,
>         /* skb of trace_tcp_send_reset() keeps the skb that caused RST,
>          * skb here is different to the troublesome skb, so use NULL
>          */
> -       trace_tcp_send_reset(sk, NULL, SK_RST_REASON_NOT_SPECIFIED);
> +       trace_tcp_send_reset(sk, NULL, reason);

Reviewed-by: Eric Dumazet <edumazet@google.com>

Re: [PATCH net-next v3 5/7] tcp: rstreason: introduce SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT for active reset

[Eric Dumazet]

On Thu, Aug 1, 2024 at 4:55 PM Jason Xing <kerneljasonxing@gmail.com> wrote:
>
> From: Jason Xing <kernelxing@tencent.com>
>
> When we find keepalive timeout here, we should send an RST to the
> other side.
>
> Signed-off-by: Jason Xing <kernelxing@tencent.com>

Note that this changelog does not really match the code.

We were sending an RST already.

Precise changelogs are needed to avoid extra work by stable teams,
that can 'catch' things based on some keywords, not only Fixes: tags.

Reviewed-by: Eric Dumazet <edumazet@google.com>

Re: [PATCH net-next v3 4/7] tcp: rstreason: introduce SK_RST_REASON_TCP_STATE for active reset

[Eric Dumazet]

On Thu, Aug 1, 2024 at 4:55 PM Jason Xing <kerneljasonxing@gmail.com> wrote:
>
> From: Jason Xing <kernelxing@tencent.com>
>
> Introducing a new type TCP_STATE to handle some reset conditions
> appearing in RFC 793 due to its socket state. Actually, we can look
> into RFC 9293 which has no discrepancy about this part.
>
> Signed-off-by: Jason Xing <kernelxing@tencent.com>

I really think this SK_RST_REASON_TCP_STATE is weak.

'Please see RFC 9293' does not help, this RFC has more than 5000 lines in it :/

Reviewed-by: Eric Dumazet <edumazet@google.com>

Re: [PATCH net-next v3 5/7] tcp: rstreason: introduce SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT for active reset

[Jason Xing]

Hello Eric,

On Fri, Aug 2, 2024 at 5:35 PM Eric Dumazet <edumazet@google.com> wrote:
>
> On Thu, Aug 1, 2024 at 4:55 PM Jason Xing <kerneljasonxing@gmail.com> wrote:
> >
> > From: Jason Xing <kernelxing@tencent.com>
> >
> > When we find keepalive timeout here, we should send an RST to the
> > other side.
> >
> > Signed-off-by: Jason Xing <kernelxing@tencent.com>
>
> Note that this changelog does not really match the code.
>
> We were sending an RST already.
>
> Precise changelogs are needed to avoid extra work by stable teams,
> that can 'catch' things based on some keywords, not only Fixes: tags.

Thanks for reminding me. I will revise the changelog.

>
> Reviewed-by: Eric Dumazet <edumazet@google.com>

Thanks!

Re: [PATCH net-next v3 4/7] tcp: rstreason: introduce SK_RST_REASON_TCP_STATE for active reset

[Jason Xing]

Hello Eric,

On Fri, Aug 2, 2024 at 5:41 PM Eric Dumazet <edumazet@google.com> wrote:
>
> On Thu, Aug 1, 2024 at 4:55 PM Jason Xing <kerneljasonxing@gmail.com> wrote:
> >
> > From: Jason Xing <kernelxing@tencent.com>
> >
> > Introducing a new type TCP_STATE to handle some reset conditions
> > appearing in RFC 793 due to its socket state. Actually, we can look
> > into RFC 9293 which has no discrepancy about this part.
> >
> > Signed-off-by: Jason Xing <kernelxing@tencent.com>
>
> I really think this SK_RST_REASON_TCP_STATE is weak.
>
> 'Please see RFC 9293' does not help, this RFC has more than 5000 lines in it :/

Yes, there are various reasons and conditions written in RFC 9293
nearly all over the place. I'm unable to conclude and get an union
name. Sorry about that. If I figure out a better name in the future,
I'll let you know.

>
> Reviewed-by: Eric Dumazet <edumazet@google.com>

Thanks for all your help.

Thanks,
Jason