netdev - Re: [PATCH v2 08/17] net: psp: add socket security association code

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Message-ID: <685cabeaa2ef6_2a5da42944b@willemb.c.googlers.com.notmuch>
Date: Wed, 25 Jun 2025 22:09:46 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Daniel Zahka <daniel.zahka@...il.com>, 
 Donald Hunter <donald.hunter@...il.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, 
 Jonathan Corbet <corbet@....net>, 
 Andrew Lunn <andrew+netdev@...n.ch>
Cc: Saeed Mahameed <saeedm@...dia.com>, 
 Leon Romanovsky <leon@...nel.org>, 
 Tariq Toukan <tariqt@...dia.com>, 
 Boris Pismenny <borisp@...dia.com>, 
 Kuniyuki Iwashima <kuniyu@...gle.com>, 
 Willem de Bruijn <willemb@...gle.com>, 
 David Ahern <dsahern@...nel.org>, 
 Neal Cardwell <ncardwell@...gle.com>, 
 Patrisious Haddad <phaddad@...dia.com>, 
 Raed Salem <raeds@...dia.com>, 
 Jianbo Liu <jianbol@...dia.com>, 
 Dragos Tatulea <dtatulea@...dia.com>, 
 Rahul Rameshbabu <rrameshbabu@...dia.com>, 
 Stanislav Fomichev <sdf@...ichev.me>, 
 Toke Høiland-Jørgensen <toke@...hat.com>, 
 Alexander Lobakin <aleksander.lobakin@...el.com>, 
 Jacob Keller <jacob.e.keller@...el.com>, 
 netdev@...r.kernel.org
Subject: Re: [PATCH v2 08/17] net: psp: add socket security association code

Daniel Zahka wrote:
> From: Jakub Kicinski <kuba@...nel.org>
> 
> Add the ability to install PSP Rx and Tx crypto keys on TCP
> connections. Netlink ops are provided for both operations.
> Rx side combines allocating a new Rx key and installing it
> on the socket. Theoretically these are separate actions,
> but in practice they will always be used one after the
> other. We can add distinct "alloc" and "install" ops later.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Daniel Zahka <daniel.zahka@...il.com>
> Co-developed-by: Daniel Zahka <daniel.zahka@...il.com>

> +static inline bool psp_is_nondata(struct sk_buff *skb, struct psp_assoc *pas)
> +{
> +	bool fin = !!(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN);
> +	u32 end_seq = TCP_SKB_CB(skb)->end_seq;
> +	u32 seq = TCP_SKB_CB(skb)->seq;
> +	bool pure_fin;
> +
> +	pure_fin = fin && end_seq - seq == 1;
> +
> +	return seq == end_seq || (pure_fin && seq == pas->upgrade_seq);
> +}

Minor: with that test against pas->upgrade_seq this function does more
than its name implies. Maybe psp_is_allowed_nondata_at_upgrade or so.