netdev - Re: [PATCH] ip.7: Document IP_LOCAL_PORT

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Message-ID: <d6682d52-25b3-a79f-c4db-6d720986b273@gmail.com>
Date:   Sun, 5 Feb 2023 14:16:00 +0100
From:   Alejandro Colomar <alx.manpages@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>,
        Michael Kerrisk <mtk.manpages@...il.com>
Cc:     linux-man@...r.kernel.org, netdev@...r.kernel.org,
        kernel-team@...udflare.com
Subject: Re: [PATCH] ip.7: Document IP_LOCAL_PORT_RANGE socket option

Hi Jakub,

On 2/1/23 13:36, Jakub Sitnicki wrote:
> Linux commit 91d0b78c5177 ("inet: Add IP_LOCAL_PORT_RANGE socket option")
> introduced a new socket option available for AF_INET and AF_INET6 sockets.
> 
> Option will be available starting from Linux 6.3. Document it.
> 
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---
> Submitting this man page update as the author of the feature.
> 
> We did a technical review of the man page text together with the code [1].

The formatting LGTM.  Could you please resend when it arrives to Linus's tree?

Cheers,

Alex

> 
> [1]: https://lore.kernel.org/all/20221221-sockopt-port-range-v6-0-be255cc0e51f@cloudflare.com/
> ---
>   man7/ip.7 | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
> 
> diff --git a/man7/ip.7 b/man7/ip.7
> index f69af1b32..f166c3b57 100644
> --- a/man7/ip.7
> +++ b/man7/ip.7
> @@ -439,6 +439,27 @@ and
>   .B IP_TOS
>   are ignored.
>   .TP
> +.BR IP_LOCAL_PORT_RANGE " (since Linux 6.3)"
> +Set or get the per-socket default local port range. This option can be used to
> +clamp down the global local port range, defined by the
> +.I ip_local_port_range
> +.I /proc
> +interface described below, for a given socket.
> +.IP
> +The option takes an
> +.I uint32_t
> +value with the high 16 bits set to the upper range bound, and the low 16 bits
> +set to the lower range bound. Range bounds are inclusive. The 16-bit values
> +should be in host byte order.
> +.IP
> +The lower bound has to be less than the upper bound when both bounds are not
> +zero. Otherwise, setting the option fails with EINVAL.
> +.IP
> +If either bound is outside of the global local port range, or is zero, then that
> +bound has no effect.
> +.IP
> +To reset the setting, pass zero as both the upper and the lower bound.
> +.TP
>   .BR IP_MSFILTER " (since Linux 2.4.22 / 2.5.68)"
>   This option provides access to the advanced full-state filtering API.
>   Argument is an

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