fix various linting issues

addr_linux.go

@@ -159,11 +159,13 @@ func (h *Handle) addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error
 	// value should be "forever". To compensate for that, only add the attributes if at least one of the values is
 	// non-zero, which means the caller has explicitly set them
 	if addr.ValidLft > 0 || addr.PreferedLft > 0 {
-		cachedata := nl.IfaCacheInfo{unix.IfaCacheinfo{
-			Valid:    uint32(addr.ValidLft),
-			Prefered: uint32(addr.PreferedLft),
-		}}
-		req.AddData(nl.NewRtAttr(unix.IFA_CACHEINFO, cachedata.Serialize()))
+		cacheData := nl.IfaCacheInfo{
+			IfaCacheinfo: unix.IfaCacheinfo{
+				Valid:    uint32(addr.ValidLft),
+				Prefered: uint32(addr.PreferedLft),
+			},
+		}
+		req.AddData(nl.NewRtAttr(unix.IFA_CACHEINFO, cacheData.Serialize()))
 	}
 
 	_, err := req.Execute(unix.NETLINK_ROUTE, 0)

conntrack_linux.go

@@ -502,10 +502,6 @@ func parseBERaw64(r *bytes.Reader, v *uint64) {
 	binary.Read(r, binary.BigEndian, v)
 }
 
-func parseRaw32(r *bytes.Reader, v *uint32) {
-	binary.Read(r, nl.NativeEndian(), v)
-}
-
 func parseByteAndPacketCounters(r *bytes.Reader) (bytes, packets uint64) {
 	for i := 0; i < 2; i++ {
 		switch _, t, _ := parseNfAttrTL(r); t {
@@ -641,7 +637,7 @@ func parseRawData(data []byte) *ConntrackFlow {
 		if nested, t, l := parseNfAttrTL(reader); nested {
 			switch t {
 			case nl.CTA_TUPLE_ORIG:
-				if nested, t, l = parseNfAttrTL(reader); nested && t == nl.CTA_TUPLE_IP {
+				if nested, t, _ = parseNfAttrTL(reader); nested && t == nl.CTA_TUPLE_IP {
 					parseIpTuple(reader, &s.Forward)
 				}
 			case nl.CTA_TUPLE_REPLY:

devlink_linux.go

@@ -257,11 +257,10 @@ type DevlinkParam struct {
 }
 
 // DevlinkParamValue contains values of the parameter
-// Data field contains specific type which can be casted by unsing info from the DevlinkParam.Type field
+// Data field contains specific type which can be cast using info from the [DevlinkParam.Type] field
 type DevlinkParamValue struct {
-	rawData []byte
-	Data    interface{}
-	CMODE   uint8 // possible values are in nl.DEVLINK_PARAM_CMODE_* constants
+	Data  interface{}
+	CMODE uint8 // possible values are in nl.DEVLINK_PARAM_CMODE_* constants
 }
 
 // parseAttributes parses provided Netlink Attributes and populates DevlinkParam, returns error if occured
@@ -324,7 +323,7 @@ func (dlpv *DevlinkParamValue) parseAttributes(attrs []syscall.NetlinkRouteAttr,
 		switch paramType {
 		case nl.DEVLINK_PARAM_TYPE_U8:
 			dlpv.Data = uint8(0)
-			if rawData != nil && len(rawData) == 1 {
+			if len(rawData) == 1 {
 				dlpv.Data = uint8(rawData[0])
 			}
 		case nl.DEVLINK_PARAM_TYPE_U16:
@@ -431,13 +430,13 @@ func (d *DevlinkDevice) parseAttributes(attrs []syscall.NetlinkRouteAttr) error
 	return nil
 }
 
-func (dev *DevlinkDevice) parseEswitchAttrs(msgs [][]byte) {
+func (d *DevlinkDevice) parseEswitchAttrs(msgs [][]byte) {
 	m := msgs[0]
 	attrs, err := nl.ParseRouteAttr(m[nl.SizeofGenlmsg:])
 	if err != nil {
 		return
 	}
-	dev.parseAttributes(attrs)
+	d.parseAttributes(attrs)
 }
 
 func (h *Handle) getEswitchAttrs(family *GenlFamily, dev *DevlinkDevice) {
@@ -544,7 +543,7 @@ func (h *Handle) createCmdReq(cmd uint8, bus string, device string) (*GenlFamily
 	return f, req, nil
 }
 
-// DevlinkGetDeviceByName provides a pointer to devlink device and nil error,
+// DevLinkGetDeviceByName provides a pointer to devlink device and nil error,
 // otherwise returns an error code.
 func (h *Handle) DevLinkGetDeviceByName(Bus string, Device string) (*DevlinkDevice, error) {
 	f, req, err := h.createCmdReq(nl.DEVLINK_CMD_GET, Bus, Device)
@@ -563,7 +562,7 @@ func (h *Handle) DevLinkGetDeviceByName(Bus string, Device string) (*DevlinkDevi
 	return dev, err
 }
 
-// DevlinkGetDeviceByName provides a pointer to devlink device and nil error,
+// DevLinkGetDeviceByName provides a pointer to devlink device and nil error,
 // otherwise returns an error code.
 func DevLinkGetDeviceByName(Bus string, Device string) (*DevlinkDevice, error) {
 	return pkgHandle.DevLinkGetDeviceByName(Bus, Device)
@@ -650,7 +649,7 @@ func parseDevLinkAllPortList(msgs [][]byte) ([]*DevlinkPort, error) {
 	return ports, nil
 }
 
-// DevLinkGetPortList provides a pointer to devlink ports and nil error,
+// DevLinkGetAllPortList provides a pointer to devlink ports and nil error,
 // otherwise returns an error code.
 // If the returned error is [ErrDumpInterrupted], results may be inconsistent
 // or incomplete.
@@ -677,7 +676,7 @@ func (h *Handle) DevLinkGetAllPortList() ([]*DevlinkPort, error) {
 	return ports, executeErr
 }
 
-// DevLinkGetPortList provides a pointer to devlink ports and nil error,
+// DevLinkGetAllPortList provides a pointer to devlink ports and nil error,
 // otherwise returns an error code.
 // If the returned error is [ErrDumpInterrupted], results may be inconsistent
 // or incomplete.
@@ -698,7 +697,7 @@ func parseDevlinkPortMsg(msgs [][]byte) (*DevlinkPort, error) {
 	return port, nil
 }
 
-// DevLinkGetPortByIndexprovides a pointer to devlink device and nil error,
+// DevLinkGetPortByIndex a pointer to devlink device and nil error,
 // otherwise returns an error code.
 func (h *Handle) DevLinkGetPortByIndex(Bus string, Device string, PortIndex uint32) (*DevlinkPort, error) {
 

ioctl_linux.go

@@ -27,8 +27,9 @@ const (
 	ETH_SS_STATS
 	// ETH_SS_PRIV_FLAGS are driver private flag names
 	ETH_SS_PRIV_FLAGS
-	// _ETH_SS_NTUPLE_FILTERS is deprecated
-	_ETH_SS_NTUPLE_FILTERS
+
+	// Deprecated: _ETH_SS_NTUPLE_FILTERS is deprecated
+	_ETH_SS_NTUPLE_FILTERS //nolint:unused
 	// ETH_SS_FEATURES are device feature names
 	ETH_SS_FEATURES
 	// ETH_SS_RSS_HASH_FUNCS is RSS hush function names

link_linux.go

@@ -2915,22 +2915,6 @@ func parseBondArpIpTargets(value []byte) []net.IP {
 	return targets
 }
 
-func addBondSlaveAttrs(bondSlave *BondSlave, linkInfo *nl.RtAttr) {
-	data := linkInfo.AddRtAttr(nl.IFLA_INFO_SLAVE_DATA, nil)
-
-	data.AddRtAttr(nl.IFLA_BOND_SLAVE_STATE, nl.Uint8Attr(uint8(bondSlave.State)))
-	data.AddRtAttr(nl.IFLA_BOND_SLAVE_MII_STATUS, nl.Uint8Attr(uint8(bondSlave.MiiStatus)))
-	data.AddRtAttr(nl.IFLA_BOND_SLAVE_LINK_FAILURE_COUNT, nl.Uint32Attr(bondSlave.LinkFailureCount))
-	data.AddRtAttr(nl.IFLA_BOND_SLAVE_QUEUE_ID, nl.Uint16Attr(bondSlave.QueueId))
-	data.AddRtAttr(nl.IFLA_BOND_SLAVE_AD_AGGREGATOR_ID, nl.Uint16Attr(bondSlave.AggregatorId))
-	data.AddRtAttr(nl.IFLA_BOND_SLAVE_AD_ACTOR_OPER_PORT_STATE, nl.Uint8Attr(bondSlave.AdActorOperPortState))
-	data.AddRtAttr(nl.IFLA_BOND_SLAVE_AD_PARTNER_OPER_PORT_STATE, nl.Uint16Attr(bondSlave.AdPartnerOperPortState))
-
-	if mac := bondSlave.PermHardwareAddr; mac != nil {
-		data.AddRtAttr(nl.IFLA_BOND_SLAVE_PERM_HWADDR, []byte(mac))
-	}
-}
-
 func parseBondSlaveData(slave LinkSlave, data []syscall.NetlinkRouteAttr) {
 	bondSlave := slave.(*BondSlave)
 	for i := range data {

neigh_linux.go

@@ -120,12 +120,6 @@ func (h *Handle) NeighAppend(neigh *Neigh) error {
 	return h.neighAdd(neigh, unix.NLM_F_CREATE|unix.NLM_F_APPEND)
 }
 
-// NeighAppend will append an entry to FDB
-// Equivalent to: `bridge fdb append...`
-func neighAdd(neigh *Neigh, mode int) error {
-	return pkgHandle.neighAdd(neigh, mode)
-}
-
 // NeighAppend will append an entry to FDB
 // Equivalent to: `bridge fdb append...`
 func (h *Handle) neighAdd(neigh *Neigh, mode int) error {

netlink_test.go

@@ -54,7 +54,7 @@ func skipUnlessKModuleLoaded(t *testing.T, moduleNames ...string) {
 
 	failed := false
 	for _, name := range moduleNames {
-		if found, _ := foundRequiredMods[name]; !found {
+		if !foundRequiredMods[name] {
 			t.Logf("Test requires missing kmodule %q.", name)
 			failed = true
 		}
@@ -217,7 +217,7 @@ func setUpNamedNetlinkTestWithKModule(t *testing.T, moduleNames ...string) (stri
 
 	failed := false
 	for _, name := range moduleNames {
-		if found, _ := foundRequiredMods[name]; !found {
+		if !foundRequiredMods[name] {
 			t.Logf("Test requires missing kmodule %q.", name)
 			failed = true
 		}

nl/nl_linux.go

@@ -19,17 +19,20 @@ import (
 	"golang.org/x/sys/unix"
 )
 
+// Family type definitions
 const (
-	// Family type definitions
 	FAMILY_ALL  = unix.AF_UNSPEC
 	FAMILY_V4   = unix.AF_INET
 	FAMILY_V6   = unix.AF_INET6
 	FAMILY_MPLS = unix.AF_MPLS
-	// Arbitrary set value (greater than default 4k) to allow receiving
-	// from kernel more verbose messages e.g. for statistics,
+)
+
+const (
+	// RECEIVE_BUFFER_SIZE is an arbitrary set value (greater than default 4k)
+	// to allow receiving from kernel more verbose messages e.g. for statistics,
 	// tc rules or filters, or other more memory requiring data.
 	RECEIVE_BUFFER_SIZE = 65536
-	// Kernel netlink pid
+	// PidKernel is the kernel netlink pid.
 	PidKernel     uint32 = 0
 	SizeofCnMsgOp        = 0x18
 )
@@ -42,7 +45,7 @@ var nextSeqNr uint32
 // Default netlink socket timeout, 60s
 var SocketTimeoutTv = unix.Timeval{Sec: 60, Usec: 0}
 
-// ErrorMessageReporting is the default error message reporting configuration for the new netlink sockets
+// EnableErrorMessageReporting is the default error message reporting configuration for the new netlink sockets
 var EnableErrorMessageReporting bool = false
 
 // ErrDumpInterrupted is an instance of errDumpInterrupted, used to report that
@@ -91,15 +94,15 @@ func NativeEndian() binary.ByteOrder {
 	return nativeEndian
 }
 
-// Byte swap a 16 bit value if we aren't big endian
+// Swap16 byte-swaps a 16 bit value if we aren't big endian.
 func Swap16(i uint16) uint16 {
 	if NativeEndian() == binary.BigEndian {
 		return i
 	}
 	return (i&0xff00)>>8 | (i&0xff)<<8
 }
 
-// Byte swap a 32 bit value if aren't big endian
+// Swap32 byte-swaps a 32 bit value if aren't big endian.
 func Swap32(i uint32) uint32 {
 	if NativeEndian() == binary.BigEndian {
 		return i
@@ -672,7 +675,8 @@ func dummyMsgIterFunc(msg []byte) bool {
 	return true
 }
 
-// Create a new netlink request from proto and flags
+// NewNetlinkRequest creates a new netlink request from proto and flags.
+//
 // Note the Len value will be inaccurate once data is added until
 // the message is serialized
 func NewNetlinkRequest(proto, flags int) *NetlinkRequest {
@@ -784,7 +788,7 @@ func executeInNetns(newNs, curNs netns.NsHandle) (func(), error) {
 	return restore, nil
 }
 
-// Create a netlink socket with a given protocol (e.g. NETLINK_ROUTE)
+// Subscribe creates a netlink socket with a given protocol (e.g. NETLINK_ROUTE)
 // and subscribe it to multicast groups passed in variable argument list.
 // Returns the netlink socket on which Receive() method can be called
 // to retrieve the messages from the kernel.
@@ -1050,7 +1054,7 @@ func ParseRouteAttr(b []byte) ([]syscall.NetlinkRouteAttr, error) {
 }
 
 // ParseRouteAttrAsMap parses provided buffer that contains raw RtAttrs and returns a map of parsed
-// atttributes indexed by attribute type or error if occured.
+// attributes indexed by attribute type or error if occurred.
 func ParseRouteAttrAsMap(b []byte) (map[uint16]syscall.NetlinkRouteAttr, error) {
 	attrMap := make(map[uint16]syscall.NetlinkRouteAttr)
 

nl/tc_linux.go

@@ -445,15 +445,15 @@ const (
 	TCA_HTB_MAX = TCA_HTB_CEIL64
 )
 
-//struct tc_htb_opt {
+// struct tc_htb_opt {
 //	struct tc_ratespec	rate;
 //	struct tc_ratespec	ceil;
 //	__u32	buffer;
 //	__u32	cbuffer;
 //	__u32	quantum;
 //	__u32	level;		/* out only */
 //	__u32	prio;
-//};
+// };
 
 type TcHtbCopt struct {
 	Rate    TcRateSpec
@@ -1123,7 +1123,7 @@ const (
 	TCA_FLOWER_KEY_ENC_OPTS
 	TCA_FLOWER_KEY_ENC_OPTS_MASK
 
-	__TCA_FLOWER_MAX
+	__TCA_FLOWER_MAX //nolint:unused
 )
 
 const TCA_CLS_FLAGS_SKIP_HW = 1 << 0 /* don't offload filter to HW */

qdisc_linux.go

@@ -769,22 +769,6 @@ func tick2Time(tick uint32) uint32 {
 	return uint32(float64(tick) / TickInUsec())
 }
 
-func time2Ktime(time uint32) uint32 {
-	return uint32(float64(time) * ClockFactor())
-}
-
-func ktime2Time(ktime uint32) uint32 {
-	return uint32(float64(ktime) / ClockFactor())
-}
-
-func burst(rate uint64, buffer uint32) uint32 {
-	return uint32(float64(rate) * float64(tick2Time(buffer)) / TIME_UNITS_PER_SEC)
-}
-
-func latency(rate uint64, limit, buffer uint32) float64 {
-	return TIME_UNITS_PER_SEC*(float64(limit)/float64(rate)) - float64(tick2Time(buffer))
-}
-
 func Xmittime(rate uint64, size uint32) uint32 {
 	// https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/tree/tc/tc_core.c#n62
 	return time2Tick(uint32(TIME_UNITS_PER_SEC * (float64(size) / float64(rate))))

route_test.go

@@ -1020,6 +1020,9 @@ func BenchmarkRouteListFilteredNew(b *testing.B) {
 	defer tearDown()
 
 	link, err := setUpRoutesBench(b)
+	if err != nil {
+		b.Fatal(err)
+	}
 
 	b.ResetTimer()
 	b.ReportAllocs()
@@ -1043,6 +1046,9 @@ func BenchmarkRouteListIter(b *testing.B) {
 	defer tearDown()
 
 	link, err := setUpRoutesBench(b)
+	if err != nil {
+		b.Fatal(err)
+	}
 
 	b.ResetTimer()
 	b.ReportAllocs()

xfrm_policy_linux.go

@@ -344,8 +344,8 @@ func parseXfrmPolicy(m []byte, family int) (*XfrmPolicy, error) {
 	for _, attr := range attrs {
 		switch attr.Attr.Type {
 		case nl.XFRMA_TMPL:
-			max := len(attr.Value)
-			for i := 0; i < max; i += nl.SizeofXfrmUserTmpl {
+			maxVal := len(attr.Value)
+			for i := 0; i < maxVal; i += nl.SizeofXfrmUserTmpl {
 				var resTmpl XfrmPolicyTmpl
 				tmpl := nl.DeserializeXfrmUserTmpl(attr.Value[i : i+nl.SizeofXfrmUserTmpl])
 				resTmpl.Dst = tmpl.XfrmId.Daddr.ToIP()