feat: netlink queueNum/table config options

cmd/root.go

@@ -174,6 +174,8 @@ type cliConfig struct {
 
 type cliConfigIO struct {
 	QueueSize   uint32 `mapstructure:"queueSize"`
+	QueueNum    uint16 `mapstructure:"queueNum"`
+	Table       string `mapstructure:"table"`
 	ReadBuffer  int    `mapstructure:"rcvBuf"`
 	WriteBuffer int    `mapstructure:"sndBuf"`
 	Local       bool   `mapstructure:"local"`
@@ -221,6 +223,8 @@ func (c *cliConfig) fillIO(config *engine.Config) error {
 			WriteBuffer: c.IO.WriteBuffer,
 			Local:       c.IO.Local,
 			RST:         c.IO.RST,
+			QueueNum:    c.IO.QueueNum,
+			Table:       c.IO.Table,
 		})
 	}
 

io/nfqueue.go

@@ -19,18 +19,18 @@ import (
 )
 
 const (
-	nfqueueNum              = 100
+	nfqueueDefaultQueueNum  = 100
 	nfqueueMaxPacketLen     = 0xFFFF
 	nfqueueDefaultQueueSize = 128
 
 	nfqueueConnMarkAccept = 1001
 	nfqueueConnMarkDrop   = 1002
 
-	nftFamily = "inet"
-	nftTable  = "opengfw"
+	nftFamily       = "inet"
+	nftDefaultTable = "opengfw"
 )
 
-func generateNftRules(local, rst bool) (*nftTableSpec, error) {
+func generateNftRules(local, rst bool, nfqueueNum int, nftTable string) (*nftTableSpec, error) {
 	if local && rst {
 		return nil, errors.New("tcp rst is not supported in local mode")
 	}
@@ -64,7 +64,7 @@ func generateNftRules(local, rst bool) (*nftTableSpec, error) {
 	return table, nil
 }
 
-func generateIptRules(local, rst bool) ([]iptRule, error) {
+func generateIptRules(local, rst bool, nfqueueNum int) ([]iptRule, error) {
 	if local && rst {
 		return nil, errors.New("tcp rst is not supported in local mode")
 	}
@@ -94,10 +94,12 @@ var _ PacketIO = (*nfqueuePacketIO)(nil)
 var errNotNFQueuePacket = errors.New("not an NFQueue packet")
 
 type nfqueuePacketIO struct {
-	n     *nfqueue.Nfqueue
-	local bool
-	rst   bool
-	rSet  bool // whether the nftables/iptables rules have been set
+	n        *nfqueue.Nfqueue
+	local    bool
+	rst      bool
+	rSet     bool // whether the nftables/iptables rules have been set
+	queueNum int
+	table    string // nftable name
 
 	// iptables not nil = use iptables instead of nftables
 	ipt4 *iptables.IPTables
@@ -108,6 +110,8 @@ type nfqueuePacketIO struct {
 
 type NFQueuePacketIOConfig struct {
 	QueueSize   uint32
+	QueueNum    uint16
+	Table       string
 	ReadBuffer  int
 	WriteBuffer int
 	Local       bool
@@ -118,6 +122,12 @@ func NewNFQueuePacketIO(config NFQueuePacketIOConfig) (PacketIO, error) {
 	if config.QueueSize == 0 {
 		config.QueueSize = nfqueueDefaultQueueSize
 	}
+	if config.QueueNum == 0 {
+		config.QueueNum = nfqueueDefaultQueueNum
+	}
+	if config.Table == "" {
+		config.Table = nftDefaultTable
+	}
 	var ipt4, ipt6 *iptables.IPTables
 	var err error
 	if nftCheck() != nil {
@@ -132,7 +142,7 @@ func NewNFQueuePacketIO(config NFQueuePacketIOConfig) (PacketIO, error) {
 		}
 	}
 	n, err := nfqueue.Open(&nfqueue.Config{
-		NfQueue:      nfqueueNum,
+		NfQueue:      config.QueueNum,
 		MaxPacketLen: nfqueueMaxPacketLen,
 		MaxQueueLen:  config.QueueSize,
 		Copymode:     nfqueue.NfQnlCopyPacket,
@@ -156,11 +166,13 @@ func NewNFQueuePacketIO(config NFQueuePacketIOConfig) (PacketIO, error) {
 		}
 	}
 	return &nfqueuePacketIO{
-		n:     n,
-		local: config.Local,
-		rst:   config.RST,
-		ipt4:  ipt4,
-		ipt6:  ipt6,
+		n:        n,
+		local:    config.Local,
+		rst:      config.RST,
+		queueNum: int(config.QueueNum),
+		table:    config.Table,
+		ipt4:     ipt4,
+		ipt6:     ipt6,
 		protectedDialer: &net.Dialer{
 			Control: func(network, address string, c syscall.RawConn) error {
 				var err error
@@ -214,7 +226,7 @@ func (n *nfqueuePacketIO) Register(ctx context.Context, cb PacketCallback) error
 		if n.ipt4 != nil {
 			err = n.setupIpt(n.local, n.rst, false)
 		} else {
-			err = n.setupNft(n.local, n.rst, false)
+			err = n.setupNft(n.local, n.rst, false, n.queueNum)
 		}
 		if err != nil {
 			return err
@@ -274,7 +286,7 @@ func (n *nfqueuePacketIO) Close() error {
 		if n.ipt4 != nil {
 			_ = n.setupIpt(n.local, n.rst, true)
 		} else {
-			_ = n.setupNft(n.local, n.rst, true)
+			_ = n.setupNft(n.local, n.rst, true, n.queueNum)
 		}
 		n.rSet = false
 	}
@@ -286,17 +298,17 @@ func (n *nfqueuePacketIO) SetCancelFunc(cancelFunc context.CancelFunc) error {
 	return nil
 }
 
-func (n *nfqueuePacketIO) setupNft(local, rst, remove bool) error {
-	rules, err := generateNftRules(local, rst)
+func (n *nfqueuePacketIO) setupNft(local, rst, remove bool, nfqueueNum int) error {
+	rules, err := generateNftRules(local, rst, nfqueueNum, n.table)
 	if err != nil {
 		return err
 	}
 	rulesText := rules.String()
 	if remove {
-		err = nftDelete(nftFamily, nftTable)
+		err = nftDelete(nftFamily, n.table)
 	} else {
 		// Delete first to make sure no leftover rules
-		_ = nftDelete(nftFamily, nftTable)
+		_ = nftDelete(nftFamily, n.table)
 		err = nftAdd(rulesText)
 	}
 	if err != nil {
@@ -306,7 +318,7 @@ func (n *nfqueuePacketIO) setupNft(local, rst, remove bool) error {
 }
 
 func (n *nfqueuePacketIO) setupIpt(local, rst, remove bool) error {
-	rules, err := generateIptRules(local, rst)
+	rules, err := generateIptRules(local, rst, n.queueNum)
 	if err != nil {
 		return err
 	}