netdev - Re: EACCES sending UDP to broadcast address?

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Date:	Thu, 09 Apr 2015 22:28:43 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org
Subject: Re: EACCES sending UDP to broadcast address?

From: Ben Greear <greearb@...delatech.com>
Date: Thu, 09 Apr 2015 18:04:44 -0700

> I'm running as root user, 4.0-rc6 + hack kernel.
> 
> User-space app is (or should be) trying to send a UDP frame
> to 255.255.255.255 destination.
> 
> I am getting EACCESS from sendmmsg.
> 
> Is this expected?  Is there something even more special than root these
> days?

You can't send to broadcast addresses without setting the
SOCK_BROADCAST socket option.

I didn't know the answer to this, it took me 10 seconds of grepping
around under net/ipv4 to figure it out.  You could have done this
too.
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