netdev - [PATCH net-next 0/2] tcp: add a new PAWS

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Message-ID: <20250110143315.571872-1-edumazet@google.com>
Date: Fri, 10 Jan 2025 14:33:13 +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>, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 0/2] 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.

Eric Dumazet (2):
  tcp: add drop_reason support to tcp_disordered_ack()
  tcp: add TCP_RFC7323_PAWS_ACK drop reason

 include/net/dropreason-core.h |  5 +++
 net/ipv4/tcp_input.c          | 85 +++++++++++++++++++++--------------
 2 files changed, 56 insertions(+), 34 deletions(-)

-- 
2.47.1.613.gc27f4b7a9f-goog