netdev - Re: [PATCH net-next v2 1/2] inet: Add IP_LOCAL_PORT

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Message-ID: <CANn89iJmmENm6DTP4qjkN23j_KT7ZS_hweR5qks4VETsUzA_eQ@mail.gmail.com>
Date:   Tue, 10 Jan 2023 15:28:58 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        kernel-team@...udflare.com, Marek Majkowski <marek@...udflare.com>
Subject: Re: [PATCH net-next v2 1/2] inet: Add IP_LOCAL_PORT_RANGE socket option

On Tue, Jan 10, 2023 at 2:37 PM Jakub Sitnicki <jakub@...udflare.com> wrote:
>
> Users who want to share a single public IP address for outgoing connections
> between several hosts traditionally reach for SNAT. However, SNAT requires
> state keeping on the node(s) performing the NAT.
>

> v1 -> v2:
>  * Fix the corner case when the per-socket range doesn't overlap with the
>    per-netns range. Fallback correctly to the per-netns range. (Kuniyuki)
>
> Reviewed-by: Marek Majkowski <marek@...udflare.com>
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---
>  include/net/inet_sock.h         |  4 ++++
>  include/net/ip.h                |  3 ++-
>  include/uapi/linux/in.h         |  1 +
>  net/ipv4/inet_connection_sock.c | 25 +++++++++++++++++++++++--
>  net/ipv4/inet_hashtables.c      |  2 +-
>  net/ipv4/ip_sockglue.c          | 18 ++++++++++++++++++
>  net/ipv4/udp.c                  |  2 +-
>  7 files changed, 50 insertions(+), 5 deletions(-)


Being an INET option, I think net/sctp/socket.c should also be changed.

Not clear if selinux_socket_bind() needs any change, I would CC
SELINUX maintainers for advice.