linux-kernel - [PATCH net-next v3 2/2] tcp: add LINUX_MIB_PAWS_TW

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Message-ID: <20250325144704.14363-3-jiayuan.chen@linux.dev>
Date: Tue, 25 Mar 2025 22:47:04 +0800
From: Jiayuan Chen <jiayuan.chen@...ux.dev>
To: netdev@...r.kernel.org,
	edumazet@...gle.com
Cc: linux-kernel@...r.kernel.org,
	kuniyu@...zon.com,
	davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	dsahern@...nel.org,
	ncardwell@...gle.com,
	mrpre@....com,
	Jiayuan Chen <jiayuan.chen@...ux.dev>
Subject: [PATCH net-next v3 2/2] tcp: add LINUX_MIB_PAWS_TW_REJECTED counter

When TCP is in TIME_WAIT state, PAWS verification uses
LINUX_PAWSESTABREJECTED, which is ambiguous and cannot be distinguished
from other PAWS verification processes.

Moreover, when PAWS occurs in TIME_WAIT, we typically need to pay special
attention to upstream network devices, so we added a new counter, like the
existing PAWS_OLD_ACK one.

Also we update the doc with previously missing PAWS_OLD_ACK.

usage:
'''
nstat -az | grep PAWSTimewait
TcpExtPAWSTimewait              1                  0.0
'''

Suggested-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Jiayuan Chen <jiayuan.chen@...ux.dev>
---
 Documentation/networking/net_cachelines/snmp.rst | 2 ++
 include/net/dropreason-core.h                    | 1 +
 include/uapi/linux/snmp.h                        | 1 +
 net/ipv4/proc.c                                  | 1 +
 net/ipv4/tcp_minisocks.c                         | 2 +-
 5 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/networking/net_cachelines/snmp.rst b/Documentation/networking/net_cachelines/snmp.rst
index bc96efc92cf5..bd44b3eebbef 100644
--- a/Documentation/networking/net_cachelines/snmp.rst
+++ b/Documentation/networking/net_cachelines/snmp.rst
@@ -37,6 +37,8 @@ unsigned_long  LINUX_MIB_TIMEWAITKILLED
 unsigned_long  LINUX_MIB_PAWSACTIVEREJECTED
 unsigned_long  LINUX_MIB_PAWSESTABREJECTED
 unsigned_long  LINUX_MIB_TSECR_REJECTED
+unsigned_long  LINUX_MIB_PAWS_OLD_ACK
+unsigned_long  LINUX_MIB_PAWS_TW_REJECTED
 unsigned_long  LINUX_MIB_DELAYEDACKLOST
 unsigned_long  LINUX_MIB_LISTENOVERFLOWS
 unsigned_long  LINUX_MIB_LISTENDROPS
diff --git a/include/net/dropreason-core.h b/include/net/dropreason-core.h
index 9701d7f936f6..bea77934a235 100644
--- a/include/net/dropreason-core.h
+++ b/include/net/dropreason-core.h
@@ -287,6 +287,7 @@ enum skb_drop_reason {
 	/**
 	 * @SKB_DROP_REASON_TCP_RFC7323_TW_PAWS: PAWS check, socket is in
 	 * TIME_WAIT state.
+	 * Corresponds to LINUX_MIB_PAWS_TW_REJECTED.
 	 */
 	SKB_DROP_REASON_TCP_RFC7323_TW_PAWS,
 	/**
diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h
index eb9fb776fdc3..cca7f7eb6e9c 100644
--- a/include/uapi/linux/snmp.h
+++ b/include/uapi/linux/snmp.h
@@ -188,6 +188,7 @@ enum
 	LINUX_MIB_PAWSESTABREJECTED,		/* PAWSEstabRejected */
 	LINUX_MIB_TSECRREJECTED,		/* TSEcrRejected */
 	LINUX_MIB_PAWS_OLD_ACK,			/* PAWSOldAck */
+	LINUX_MIB_PAWS_TW_REJECTED,		/* PAWSTimewait */
 	LINUX_MIB_DELAYEDACKS,			/* DelayedACKs */
 	LINUX_MIB_DELAYEDACKLOCKED,		/* DelayedACKLocked */
 	LINUX_MIB_DELAYEDACKLOST,		/* DelayedACKLost */
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 10cbeb76c274..ea2f01584379 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -191,6 +191,7 @@ static const struct snmp_mib snmp4_net_list[] = {
 	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
 	SNMP_MIB_ITEM("TSEcrRejected", LINUX_MIB_TSECRREJECTED),
 	SNMP_MIB_ITEM("PAWSOldAck", LINUX_MIB_PAWS_OLD_ACK),
+	SNMP_MIB_ITEM("PAWSTimewait", LINUX_MIB_PAWS_TW_REJECTED),
 	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
 	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
 	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 27511bf58c0f..43d7852ce07e 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -248,7 +248,7 @@ tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb,
 
 	if (paws_reject) {
 		*drop_reason = SKB_DROP_REASON_TCP_RFC7323_TW_PAWS;
-		__NET_INC_STATS(twsk_net(tw), LINUX_MIB_PAWSESTABREJECTED);
+		__NET_INC_STATS(twsk_net(tw), LINUX_MIB_PAWS_TW_REJECTED);
 	}
 
 	if (!th->rst) {
-- 
2.47.1