From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick McHardy Subject: Re: SOCK_RAW does not receive broadcast (with VLAN unless PROMISC) Date: Tue, 09 Jun 2009 15:14:33 +0200 Message-ID: <4A2E6039.2060805@trash.net> References: <91ac27070906081105x30171bedra10d244d382a6934@mail.gmail.com> <20090608.143454.161329513.davem@davemloft.net> <4A2E4077.8080407@trash.net> <91ac27070906090427k6f57745xc72f9fcb6801957a@mail.gmail.com> <4A2E4A32.1060705@trash.net> <91ac27070906090608me50af3bv23b150d8d0cd0080@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Cc: David Miller , linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: Gil Beniamini Return-path: Received: from stinky.trash.net ([213.144.137.162]:62834 "EHLO stinky.trash.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752108AbZFINOd (ORCPT ); Tue, 9 Jun 2009 09:14:33 -0400 In-Reply-To: <91ac27070906090608me50af3bv23b150d8d0cd0080@mail.gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: Please don't top-post. Gil Beniamini wrote: > On the specific NIC (eth1) no vlan is defined, and in the new Linux > the application receive NOTHING at all. In order to debug, I start > "wireshark as root" and "wireshark" set PROMISC on, and the > application start receive the raw packets as expected. Later I started > setting PROMISC by my application, and it can receive the packets even > when "wireshark" is not running. > The problem that I have with PROMISC mode, is that I need to do the > irelevant unicast filtering in software rather than get it from the > hardware (as it works in old kernel 2.6.20). in older kernels the hardware filtering was inconsistent. Some drivers behaved as today, meaning they filtered out all VLANs unless locally configured, some filtered nothing until the first VLAN was added, at which point they would filter all other VLANs (and maybe enable header stripping). The behaviour you describe is intended, only locally configured VLANs are received unless you switch to promiscous mode.