Date: Tue, 25 Aug 2015 20:25:27 +0200
From: Thomas Graf <tgraf@suug.ch>
To: Joe Stringer <joestringer@nicira.com>
Cc: netdev@vger.kernel.org, pshelar@nicira.com, linux-kernel@vger.kernel.org,
        pablo@netfilter.org, fwestpha@redhat.com, hannes@redhat.com,
        jpettit@nicira.com, jesse@nicira.com, netfilter-devel@vger.kernel.org,
        Andy Zhou <azhou@nicira.com>
Subject: Re: [PATCHv5 net-next 05/10] openvswitch: Add conntrack action
Message-ID: <20150825182527.GJ3707@pox.localdomain>
References: <1440462740-23358-1-git-send-email-joestringer@nicira.com>
 <1440462740-23358-6-git-send-email-joestringer@nicira.com>
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On 08/24/15 at 05:32pm, Joe Stringer wrote:
> Expose the kernel connection tracker via OVS. Userspace components can
> make use of the CT action to populate the connection state (ct_state)
> field for a flow. This state can be subsequently matched.
> 
> Exposed connection states are OVS_CS_F_*:
> - NEW (0x01) - Beginning of a new connection.
> - ESTABLISHED (0x02) - Part of an existing connection.
> - RELATED (0x04) - Related to an established connection.
> - INVALID (0x20) - Could not track the connection for this packet.
> - REPLY_DIR (0x40) - This packet is in the reply direction for the flow.
> - TRACKED (0x80) - This packet has been sent through conntrack.
> 
> When the CT action is executed by itself, it will send the packet
> through the connection tracker and populate the ct_state field with one
> or more of the connection state flags above. The CT action will always
> set the TRACKED bit.
> 
> When the COMMIT flag is passed to the conntrack action, this specifies
> that information about the connection should be stored. This allows
> subsequent packets for the same (or related) connections to be
> correlated with this connection. Sending subsequent packets for the
> connection through conntrack allows the connection tracker to consider
> the packets as ESTABLISHED, RELATED, and/or REPLY_DIR.
> 
> The CT action may optionally take a zone to track the flow within. This
> allows connections with the same 5-tuple to be kept logically separate
> from connections in other zones. If the zone is specified, then the
> "ct_zone" match field will be subsequently populated with the zone id.
> 
> IP fragments are handled by transparently assembling them as part of the
> CT action. The maximum received unit (MRU) size is tracked so that
> refragmentation can occur during output.
> 
> IP frag handling contributed by Andy Zhou.
> 
> Signed-off-by: Joe Stringer <joestringer@nicira.com>
> Signed-off-by: Justin Pettit <jpettit@nicira.com>
> Signed-off-by: Andy Zhou <azhou@nicira.com>

Acked-by: Thomas Graf <tgraf@suug.ch>
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