+.
+.IP \fBmod_nw_src\fB:\fIip\fR
+Sets the IPv4 source address to \fIip\fR.
+.
+.IP \fBmod_nw_dst\fB:\fIip\fR
+Sets the IPv4 destination address to \fIip\fR.
+.
+.IP \fBmod_tp_src\fB:\fIport\fR
+Sets the TCP or UDP source port to \fIport\fR.
+.
+.IP \fBmod_tp_dst\fB:\fIport\fR
+Sets the TCP or UDP destination port to \fIport\fR.
+.
+.IP \fBmod_nw_tos\fB:\fItos\fR
+Sets the IP ToS/DSCP field to \fItos\fR. Valid values are between 0 and
+255, inclusive. Note that the two lower reserved bits are never
+modified.
+.
+.RE
+.IP
+The following actions are Nicira vendor extensions that, as of this writing, are
+only known to be implemented by Open vSwitch:
+.
+.RS
+.
+.IP \fBresubmit\fB:\fIport\fR
+Re-searches the OpenFlow flow table with the \fBin_port\fR field
+replaced by \fIport\fR and executes the actions found, if any, in
+addition to any other actions in this flow entry. Recursive
+\fBresubmit\fR actions are ignored.
+.
+.IP \fBset_tunnel\fB:\fIid\fR
+If outputting to a port that encapsulates the packet in a tunnel and supports
+an identifier (such as GRE), sets the identifier to \fBid\fR.
+.