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    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.


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