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Date:   Sat, 2 Jan 2021 19:36:04 +0100
From:   Pali =?utf-8?B?Um9ow6Fy?= <pali@kernel.org>
To:     "Alejandro Colomar (man-pages)" <alx.manpages@gmail.com>
Cc:     linux-man@vger.kernel.org, Michael Kerrisk <mtk.manpages@gmail.com>
Subject: Re: [PATCH] netdevice.7: Update documentation for SIOCGIFADDR
 SIOCSIFADDR SIOCDIFADDR
Message-ID: <20210102183604.ocbhegclbkugm45l@pali>
References: <20210102140254.16714-1-pali@kernel.org>
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On Saturday 02 January 2021 19:10:54 Pali Rohár wrote:
> Hello!
> 
> On Saturday 02 January 2021 19:04:06 Alejandro Colomar (man-pages) wrote:
> > I've seen there's ifr_ifindex too (see SIOCGIFNAME).
> > Can it be used in the same way as ifr6_ifindex?
> 
> Sorry, I do not know too. In all applications I saw that they are using
> ifr_name for IPv4 stuff.
> 
> This needs to be tested if ifr_ifindex instead of ifr_name works for
> specifying IPv4 address.

Now I can answer, no, it cannot be used. ifr_ifindex is part of union
structure where is also ifr_addr. So you can specify either ifr_ifindex
or ifr_addr, but not both fields at the same time.

Therefore network interface for IPv4 address can be specified only via
ifr_name.