lkml.org 
[lkml]   [2013]   [May]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 05/15] connection tracking helper for SLP
On Tue, May 07, 2013 at 04:18:13PM +0200, Jiri Slaby wrote:
> From: Jiri Bohac <jbohac@suse.cz>
>
> A simple connection tracking helper for SLP. Marks replies to a
> SLP broadcast query as ESTABLISHED to allow them to pass through the
> firewall.
>
> Signed-off-by: Jiri Bohac <jbohac@suse.cz>
> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
> Cc: netfilter-devel@vger.kernel.org
> Cc: netfilter@vger.kernel.org
> Cc: coreteam@netfilter.org
> Cc: netdev@vger.kernel.org
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Patrick McHardy <kaber@trash.net>
> Cc: Pablo Neira Ayuso <pablo@netfilter.org>
> ---
> net/netfilter/Kconfig | 15 +++++
> net/netfilter/Makefile | 1 +
> net/netfilter/nf_conntrack_slp.c | 131 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 147 insertions(+)
> create mode 100644 net/netfilter/nf_conntrack_slp.c
>
> diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
> index 56d22ca..ec61b30 100644
> --- a/net/netfilter/Kconfig
> +++ b/net/netfilter/Kconfig
> @@ -320,6 +320,21 @@ config NF_CONNTRACK_TFTP
>
> To compile it as a module, choose M here. If unsure, say N.
>
> +config NF_CONNTRACK_SLP
> + tristate "SLP protocol support"
> + depends on NF_CONNTRACK
> + depends on NETFILTER_ADVANCED
> + help
> + SLP queries are sometimes sent as broadcast messages from an
> + unprivileged port and responded to with unicast messages to the
> + same port. This make them hard to firewall properly because connection
> + tracking doesn't deal with broadcasts. This helper tracks locally
> + originating broadcast SLP queries and the corresponding
> + responses. It relies on correct IP address configuration, specifically
> + netmask and broadcast address.

We have the user-space helper infrastructure in the conntrack-tools,
this helper has to go there.


\
 
 \ /
  Last update: 2013-05-08 04:41    [W:0.194 / U:5.940 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site