To enable SNAT, run configure with the "--enable-snat" flag. This has
only been tested with the 2.6.23 kernel...more diverse testing will follow.
Documentation and a cleaner build setup will also be in a future check-in.
Allow vendors to define their own actions. Actions were originally fixed-
length, which was a bit constraining. Actions now contain a length field,
which gives them more flexibility.
Stripping VLANs is now done through the OFPAT_STRIP_VLAN action (i.e., you
don't specify a magic value in the generirc VLAN action). Also, it is now
possible to modify the priority bits associated with the VLAN tag through
the OFPAT_SET_VLAN_PCP action. The OFPAT_SET_DL_VLAN has been renamed to
OFPAT_SET_VLAN_VID.
This new OpenFlow message format provides a cleaner interface and greater
detail and control over ports. It is now possible to see what features
the switch's port is currently configured as having, what it's advertising,
and what it's capable of handling. It is also possible to return the
features advertised by the port's peer.
802.1D Spanning Tree Protocol supports a maximum of 255 ports per bridge,
but OpenFlow supported 256, so 1 port had to not implement STP. This
gets rid of the problem by reducing the maximum number of ports to 255.
This cleans up the handling of modifying existing flows. There now exists
OFPFC_MODIFY and OFPFC_MODIFY_STRICT commands, which have the same matching
characteristics to their OFPFC_DELETE* counterparts. When adding a flow that
already exists, the counters and timers are now reset (ie, its treated as a
new flow). This commit also adds the "--strict" option to dpctl to allow
strict matching for "mod-flows" and "del-flows".
Older versions of OpenFlow pre-defined a few different types of tables and the
Features Reply message would indicate how many of those entries existed. This
was very inflexible, so now the Features Reply just indicates how many tables
there are. The controller now sends a Table Stats request to find out how
many entries are supported and the fields that can be wildcarded.
This change also removes the "buffer_mb" field from the Features Reply, since
it was not being used and seemed to be of limited value.
The original packet-out format allowed multiple actions to be specified for
buffered packets, but only a destination port for messages including data.
This change makes packet-out more consistent by allowing multiple actions
regardless of how the packet is stored.
This change also disallows sending packets through the incoming port without
explicitly using the OFPP_IN_PORT virtual port.
This updates the OpenFlow protocol version and changes the names of
structure members, so any software that uses OpenFlow will need to be
updated to match.
Justin Pettit
Ben Pfaff
Ben Pfaff