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Message-Id: <20240802102112.9199-7-kerneljasonxing@gmail.com>
Date: Fri, 2 Aug 2024 18:21:11 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
dsahern@...nel.org,
kuniyu@...zon.com
Cc: netdev@...r.kernel.org,
Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next v4 6/7] tcp: rstreason: introduce SK_RST_REASON_TCP_DISCONNECT_WITH_DATA for active reset
From: Jason Xing <kernelxing@...cent.com>
When user tries to disconnect a socket and there are more data written
into tcp write queue, we should tell users about this reset reason.
Signed-off-by: Jason Xing <kernelxing@...cent.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.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
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