From ca263a814b494f17fe674dbf6c24535fb2d63859 Mon Sep 17 00:00:00 2001
From: Tom D <40675700+twitchy-jsonp@users.noreply.github.com>
Date: Wed, 13 Feb 2019 01:06:43 -0800
Subject: [PATCH] Add support for inverted set lookups. (#10)

---
 expr/lookup.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/expr/lookup.go b/expr/lookup.go
index 50dd5fc..67ab165 100644
--- a/expr/lookup.go
+++ b/expr/lookup.go
@@ -29,6 +29,7 @@ type Lookup struct {
 
 	SetID   uint32
 	SetName string
+	Invert  bool
 }
 
 func (e *Lookup) marshal() ([]byte, error) {
@@ -40,6 +41,9 @@ func (e *Lookup) marshal() ([]byte, error) {
 	if e.DestRegister != 0 {
 		opAttrs = append(opAttrs, netlink.Attribute{Type: unix.NFTA_LOOKUP_DREG, Data: binaryutil.BigEndian.PutUint32(e.DestRegister)})
 	}
+	if e.Invert {
+		opAttrs = append(opAttrs, netlink.Attribute{Type: unix.NFTA_LOOKUP_FLAGS, Data: binaryutil.BigEndian.PutUint32(unix.NFT_LOOKUP_F_INV)})
+	}
 	opAttrs = append(opAttrs,
 		netlink.Attribute{Type: unix.NFTA_LOOKUP_SET, Data: []byte(e.SetName + "\x00")},
 		netlink.Attribute{Type: unix.NFTA_LOOKUP_SET_ID, Data: binaryutil.BigEndian.PutUint32(e.SetID)},