netdev - [PATCH v2 net-next 0/3] tcp: add a new PAWS

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Message-ID: <20250113135558.3180360-1-edumazet@google.com>
Date: Mon, 13 Jan 2025 13:55:55 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Simon Horman <horms@...nel.org>, 
	Neal Cardwell <ncardwell@...gle.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, 
	Jason Xing <kerneljasonxing@...il.com>, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 0/3] tcp: add a new PAWS_ACK drop reason

Current TCP_RFC7323_PAWS drop reason is too generic and can
cause confusion.

One common source for these drops are ACK packets coming too late.

A prior packet with payload already changed tp->rcv_nxt.

Add TCP_RFC7323_PAWS_ACK new drop reason, and do not
generate a DUPACK for such old ACK.

v2:
- Also add matching LINUX_MIB_PAWS_OLD_ACK SNMP counter.
- fix a typo in one changelog.

Eric Dumazet (3):
  tcp: add drop_reason support to tcp_disordered_ack()
  tcp: add TCP_RFC7323_PAWS_ACK drop reason
  tcp: add LINUX_MIB_PAWS_OLD_ACK SNMP counter

 include/net/dropreason-core.h |  6 +++
 include/uapi/linux/snmp.h     |  1 +
 net/ipv4/proc.c               |  1 +
 net/ipv4/tcp_input.c          | 84 +++++++++++++++++++++--------------
 4 files changed, 59 insertions(+), 33 deletions(-)

-- 
2.47.1.613.gc27f4b7a9f-goog