From 385f80f4ef5b5aa1e6d369d1574d754497f13a7a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Sch=C3=A4r?= <jan@monogon.tech>
Date: Wed, 26 Feb 2025 12:27:31 +0100
Subject: [PATCH] Use const instead of var where possible

---
 gen.go   | 3 ++-
 obj.go   | 2 +-
 rule.go  | 2 +-
 set.go   | 6 ++++--
 table.go | 2 +-
 5 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/gen.go b/gen.go
index 4ebcfbe..0d4580d 100644
--- a/gen.go
+++ b/gen.go
@@ -3,6 +3,7 @@ package nftables
 import (
 	"encoding/binary"
 	"fmt"
+
 	"github.com/mdlayher/netlink"
 	"golang.org/x/sys/unix"
 )
@@ -13,7 +14,7 @@ type GenMsg struct {
 	ProcComm string // [16]byte - max 16bytes - kernel TASK_COMM_LEN
 }
 
-var genHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWGEN)
+const genHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWGEN)
 
 func genFromMsg(msg netlink.Message) (*GenMsg, error) {
 	if got, want := msg.Header.Type, genHeaderType; got != want {
diff --git a/obj.go b/obj.go
index 3fcd6d7..634931b 100644
--- a/obj.go
+++ b/obj.go
@@ -25,7 +25,7 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-var (
+const (
 	newObjHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWOBJ)
 	delObjHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_DELOBJ)
 )
diff --git a/rule.go b/rule.go
index 0706834..ad708d0 100644
--- a/rule.go
+++ b/rule.go
@@ -25,7 +25,7 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-var (
+const (
 	newRuleHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWRULE)
 	delRuleHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_DELRULE)
 )
diff --git a/set.go b/set.go
index a7441d9..446132f 100644
--- a/set.go
+++ b/set.go
@@ -166,7 +166,9 @@ var (
 		TypeTimeDay,
 		TypeCGroupV2,
 	}
+)
 
+const (
 	// ctLabelBitSize is defined in https://git.netfilter.org/nftables/tree/src/ct.c.
 	ctLabelBitSize uint32 = 128
 
@@ -737,7 +739,7 @@ func (cc *Conn) FlushSet(s *Set) {
 	})
 }
 
-var (
+const (
 	newSetHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWSET)
 	delSetHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_DELSET)
 )
@@ -837,7 +839,7 @@ func parseSetDatatype(magic uint32) (SetDatatype, error) {
 	return dt, nil
 }
 
-var (
+const (
 	newElemHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWSETELEM)
 	delElemHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_DELSETELEM)
 )
diff --git a/table.go b/table.go
index c391b7b..79e486b 100644
--- a/table.go
+++ b/table.go
@@ -21,7 +21,7 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-var (
+const (
 	newTableHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_NEWTABLE)
 	delTableHeaderType = netlink.HeaderType((unix.NFNL_SUBSYS_NFTABLES << 8) | unix.NFT_MSG_DELTABLE)
 )