netdev - [PATCH net-next v3 1/6] tcp: introduce another three dropreasons in receive path

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Date: Mon, 12 Feb 2024 17:28:22 +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,
	kerneljasonxing@...il.com,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next v3 1/6] tcp: introduce another three dropreasons in receive path

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

Soon later patches can use these relatively more accurate
reasons to recognise and find out the cause.

Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
 include/net/dropreason-core.h | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
index 7cedece5dbbb..92513acca431 100644
--- a/include/net/dropreason-core.h
+++ b/include/net/dropreason-core.h
@@ -31,6 +31,8 @@
 	FN(TCP_AOFAILURE)		\
 	FN(SOCKET_BACKLOG)		\
 	FN(TCP_FLAGS)			\
+	FN(TCP_CONNREQNOTACCEPTABLE)			\
+	FN(TCP_ABORTONDATA)			\
 	FN(TCP_ZEROWINDOW)		\
 	FN(TCP_OLD_DATA)		\
 	FN(TCP_OVERWINDOW)		\
@@ -38,6 +40,7 @@
 	FN(TCP_RFC7323_PAWS)		\
 	FN(TCP_OLD_SEQUENCE)		\
 	FN(TCP_INVALID_SEQUENCE)	\
+	FN(TCP_INVALID_ACK_SEQUENCE)	\
 	FN(TCP_RESET)			\
 	FN(TCP_INVALID_SYN)		\
 	FN(TCP_CLOSE)			\
@@ -207,6 +210,17 @@ enum skb_drop_reason {
 	SKB_DROP_REASON_SOCKET_BACKLOG,
 	/** @SKB_DROP_REASON_TCP_FLAGS: TCP flags invalid */
 	SKB_DROP_REASON_TCP_FLAGS,
+	/**
+	 * @SKB_DROP_REASON_TCP_CONNREQNOTACCEPTABLE: connection request is not
+	 * acceptable. This reason currently is a little bit obscure. It could
+	 * be split into more specific reasons in the future.
+	 */
+	SKB_DROP_REASON_TCP_CONNREQNOTACCEPTABLE,
+	/**
+	 * @SKB_DROP_REASON_TCP_ABORTONDATA: abort on data, corresponding to
+	 * LINUX_MIB_TCPABORTONDATA
+	 */
+	SKB_DROP_REASON_TCP_ABORTONDATA,
 	/**
 	 * @SKB_DROP_REASON_TCP_ZEROWINDOW: TCP receive window size is zero,
 	 * see LINUX_MIB_TCPZEROWINDOWDROP
@@ -231,13 +245,19 @@ enum skb_drop_reason {
 	SKB_DROP_REASON_TCP_OFOMERGE,
 	/**
 	 * @SKB_DROP_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
-	 * LINUX_MIB_PAWSESTABREJECTED
+	 * LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
 	 */
 	SKB_DROP_REASON_TCP_RFC7323_PAWS,
 	/** @SKB_DROP_REASON_TCP_OLD_SEQUENCE: Old SEQ field (duplicate packet) */
 	SKB_DROP_REASON_TCP_OLD_SEQUENCE,
 	/** @SKB_DROP_REASON_TCP_INVALID_SEQUENCE: Not acceptable SEQ field */
 	SKB_DROP_REASON_TCP_INVALID_SEQUENCE,
+	/**
+	 * @SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
+	 * field. because of ack sequence is not in the window between snd_una
+	 * and snd_nxt
+	 */
+	SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE,
 	/** @SKB_DROP_REASON_TCP_RESET: Invalid RST packet */
 	SKB_DROP_REASON_TCP_RESET,
 	/**
-- 
2.37.3