func LinkGetProtinfo(link Link) (Protinfo, error) {
base := link.Attrs()
ensureIndex(base)
var pi Protinfo
req := nl.NewNetlinkRequest(syscall.RTM_GETLINK, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(syscall.AF_BRIDGE)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, 0)
if err != nil {
return pi, err
}
for _, m := range msgs {
ans := nl.DeserializeIfInfomsg(m)
if int(ans.Index) != base.Index {
continue
}
attrs, err := nl.ParseRouteAttr(m[ans.Len():])
if err != nil {
return pi, err
}
for _, attr := range attrs {
if attr.Attr.Type != syscall.IFLA_PROTINFO|syscall.NLA_F_NESTED {
continue
}
infos, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return pi, err
}
var pi Protinfo
for _, info := range infos {
switch info.Attr.Type {
case nl.IFLA_BRPORT_MODE:
pi.Hairpin = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_GUARD:
pi.Guard = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_FAST_LEAVE:
pi.FastLeave = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_PROTECT:
pi.RootBlock = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_LEARNING:
pi.Learning = byteToBool(info.Value[0])
case nl.IFLA_BRPORT_UNICAST_FLOOD:
pi.Flood = byteToBool(info.Value[0])
}
}
return pi, nil
}
}
return pi, fmt.Errorf("Device with index %d not found", base.Index)
}
func parseU32Data(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error) {
native = nl.NativeEndian()
u32 := filter.(*U32)
detailed := false
for _, datum := range data {
switch datum.Attr.Type {
case nl.TCA_U32_SEL:
detailed = true
sel := nl.DeserializeTcU32Sel(datum.Value)
// only parse if we have a very basic redirect
if sel.Flags&nl.TC_U32_TERMINAL == 0 || sel.Nkeys != 1 {
return detailed, nil
}
case nl.TCA_U32_ACT:
table, err := nl.ParseRouteAttr(datum.Value)
if err != nil {
return detailed, err
}
if len(table) != 1 || table[0].Attr.Type != nl.TCA_ACT_TAB {
return detailed, fmt.Errorf("Action table not formed properly")
}
aattrs, err := nl.ParseRouteAttr(table[0].Value)
for _, aattr := range aattrs {
switch aattr.Attr.Type {
case nl.TCA_KIND:
actionType := string(aattr.Value[:len(aattr.Value)-1])
// only parse if the action is mirred
if actionType != "mirred" {
return detailed, nil
}
case nl.TCA_OPTIONS:
adata, err := nl.ParseRouteAttr(aattr.Value)
if err != nil {
return detailed, err
}
for _, adatum := range adata {
switch adatum.Attr.Type {
case nl.TCA_MIRRED_PARMS:
mir := nl.DeserializeTcMirred(adatum.Value)
u32.RedirIndex = int(mir.Ifindex)
}
}
}
}
}
}
return detailed, nil
}
func parseNetemData(qdisc Qdisc, value []byte) error {
netem := qdisc.(*Netem)
opt := nl.DeserializeTcNetemQopt(value)
netem.Latency = opt.Latency
netem.Limit = opt.Limit
netem.Loss = opt.Loss
netem.Gap = opt.Gap
netem.Duplicate = opt.Duplicate
netem.Jitter = opt.Jitter
data, err := nl.ParseRouteAttr(value[nl.SizeofTcNetemQopt:])
if err != nil {
return err
}
for _, datum := range data {
switch datum.Attr.Type {
case nl.TCA_NETEM_CORR:
opt := nl.DeserializeTcNetemCorr(datum.Value)
netem.DelayCorr = opt.DelayCorr
netem.LossCorr = opt.LossCorr
netem.DuplicateCorr = opt.DupCorr
case nl.TCA_NETEM_CORRUPT:
opt := nl.DeserializeTcNetemCorrupt(datum.Value)
netem.CorruptProb = opt.Probability
netem.CorruptCorr = opt.Correlation
case nl.TCA_NETEM_REORDER:
opt := nl.DeserializeTcNetemReorder(datum.Value)
netem.ReorderProb = opt.Probability
netem.ReorderCorr = opt.Correlation
}
}
return nil
}
func parseFwData(filter Filter, data []syscall.NetlinkRouteAttr) (bool, error) {
native = nl.NativeEndian()
fw := filter.(*Fw)
detailed := true
for _, datum := range data {
switch datum.Attr.Type {
case nl.TCA_FW_MASK:
fw.Mask = native.Uint32(datum.Value[0:4])
case nl.TCA_FW_CLASSID:
fw.ClassId = native.Uint32(datum.Value[0:4])
case nl.TCA_FW_INDEV:
fw.InDev = string(datum.Value[:len(datum.Value)-1])
case nl.TCA_FW_POLICE:
adata, _ := nl.ParseRouteAttr(datum.Value)
for _, aattr := range adata {
switch aattr.Attr.Type {
case nl.TCA_POLICE_TBF:
fw.Police = *nl.DeserializeTcPolice(aattr.Value)
case nl.TCA_POLICE_RATE:
fw.Rtab = DeserializeRtab(aattr.Value)
case nl.TCA_POLICE_PEAKRATE:
fw.Ptab = DeserializeRtab(aattr.Value)
}
}
}
}
return detailed, nil
}
func NeighDeserialize(m []byte) (*Neigh, error) {
msg := deserializeNdmsg(m)
neigh := Neigh{
LinkIndex: int(msg.Index),
Family: int(msg.Family),
State: int(msg.State),
Type: int(msg.Type),
Flags: int(msg.Flags),
}
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
for _, attr := range attrs {
switch attr.Attr.Type {
case NDA_DST:
neigh.IP = net.IP(attr.Value)
case NDA_LLADDR:
neigh.HardwareAddr = net.HardwareAddr(attr.Value)
}
}
return &neigh, nil
}
// XfrmPolicyList gets a list of xfrm policies in the system.
// Equivalent to: `ip xfrm policy show`.
// The list can be filtered by ip family.
func XfrmPolicyList(family int) ([]XfrmPolicy, error) {
req := nl.NewNetlinkRequest(nl.XFRM_MSG_GETPOLICY, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_XFRM, nl.XFRM_MSG_NEWPOLICY)
if err != nil {
return nil, err
}
var res []XfrmPolicy
for _, m := range msgs {
msg := nl.DeserializeXfrmUserpolicyInfo(m)
if family != FAMILY_ALL && family != int(msg.Sel.Family) {
continue
}
var policy XfrmPolicy
policy.Dst = msg.Sel.Daddr.ToIPNet(msg.Sel.PrefixlenD)
policy.Src = msg.Sel.Saddr.ToIPNet(msg.Sel.PrefixlenS)
policy.Priority = int(msg.Priority)
policy.Index = int(msg.Index)
policy.Dir = Dir(msg.Dir)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.XFRMA_TMPL:
max := len(attr.Value)
for i := 0; i < max; i += nl.SizeofXfrmUserTmpl {
var resTmpl XfrmPolicyTmpl
tmpl := nl.DeserializeXfrmUserTmpl(attr.Value[i : i+nl.SizeofXfrmUserTmpl])
resTmpl.Dst = tmpl.XfrmId.Daddr.ToIP()
resTmpl.Src = tmpl.Saddr.ToIP()
resTmpl.Proto = Proto(tmpl.XfrmId.Proto)
resTmpl.Mode = Mode(tmpl.Mode)
resTmpl.Reqid = int(tmpl.Reqid)
policy.Tmpls = append(policy.Tmpls, resTmpl)
}
}
}
res = append(res, policy)
}
return res, nil
}
// deserializeRoute decodes a binary netlink message into a Route struct
func deserializeRoute(m []byte) (Route, error) {
msg := nl.DeserializeRtMsg(m)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return Route{}, err
}
route := Route{
Scope: Scope(msg.Scope),
Protocol: int(msg.Protocol),
Table: int(msg.Table),
Type: int(msg.Type),
Tos: int(msg.Tos),
Flags: int(msg.Flags),
}
native := nl.NativeEndian()
for _, attr := range attrs {
switch attr.Attr.Type {
case syscall.RTA_GATEWAY:
route.Gw = net.IP(attr.Value)
case syscall.RTA_PREFSRC:
route.Src = net.IP(attr.Value)
case syscall.RTA_DST:
route.Dst = &net.IPNet{
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Dst_len), 8*len(attr.Value)),
}
case syscall.RTA_OIF:
route.LinkIndex = int(native.Uint32(attr.Value[0:4]))
case syscall.RTA_IIF:
route.ILinkIndex = int(native.Uint32(attr.Value[0:4]))
case syscall.RTA_PRIORITY:
route.Priority = int(native.Uint32(attr.Value[0:4]))
case syscall.RTA_TABLE:
route.Table = int(native.Uint32(attr.Value[0:4]))
}
}
return route, nil
}
// XfrmStateList gets a list of xfrm states in the system.
// Equivalent to: `ip xfrm state show`.
// The list can be filtered by ip family.
func XfrmStateList(family int) ([]XfrmState, error) {
req := nl.NewNetlinkRequest(nl.XFRM_MSG_GETSA, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_XFRM, nl.XFRM_MSG_NEWSA)
if err != nil {
return nil, err
}
var res []XfrmState
for _, m := range msgs {
msg := nl.DeserializeXfrmUsersaInfo(m)
if family != FAMILY_ALL && family != int(msg.Family) {
continue
}
var state XfrmState
state.Dst = msg.Id.Daddr.ToIP()
state.Src = msg.Saddr.ToIP()
state.Proto = Proto(msg.Id.Proto)
state.Mode = Mode(msg.Mode)
state.Spi = int(nl.Swap32(msg.Id.Spi))
state.Reqid = int(msg.Reqid)
state.ReplayWindow = int(msg.ReplayWindow)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.XFRMA_ALG_AUTH, nl.XFRMA_ALG_CRYPT:
var resAlgo *XfrmStateAlgo
if attr.Attr.Type == nl.XFRMA_ALG_AUTH {
if state.Auth == nil {
state.Auth = new(XfrmStateAlgo)
}
resAlgo = state.Auth
} else {
state.Crypt = new(XfrmStateAlgo)
resAlgo = state.Crypt
}
algo := nl.DeserializeXfrmAlgo(attr.Value[:])
(*resAlgo).Name = nl.BytesToString(algo.AlgName[:])
(*resAlgo).Key = algo.AlgKey
case nl.XFRMA_ALG_AUTH_TRUNC:
if state.Auth == nil {
state.Auth = new(XfrmStateAlgo)
}
algo := nl.DeserializeXfrmAlgoAuth(attr.Value[:])
state.Auth.Name = nl.BytesToString(algo.AlgName[:])
state.Auth.Key = algo.AlgKey
state.Auth.TruncateLen = int(algo.AlgTruncLen)
case nl.XFRMA_ENCAP:
encap := nl.DeserializeXfrmEncapTmpl(attr.Value[:])
state.Encap = new(XfrmStateEncap)
state.Encap.Type = EncapType(encap.EncapType)
state.Encap.SrcPort = int(nl.Swap16(encap.EncapSport))
state.Encap.DstPort = int(nl.Swap16(encap.EncapDport))
state.Encap.OriginalAddress = encap.EncapOa.ToIP()
}
}
res = append(res, state)
}
return res, nil
}
// QdiscList gets a list of qdiscs in the system.
// Equivalent to: `tc qdisc show`.
// The list can be filtered by link.
func QdiscList(link Link) ([]Qdisc, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETQDISC, syscall.NLM_F_DUMP)
index := int32(0)
if link != nil {
base := link.Attrs()
ensureIndex(base)
index = int32(base.Index)
}
msg := &nl.TcMsg{
Family: nl.FAMILY_ALL,
Ifindex: index,
}
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWQDISC)
if err != nil {
return nil, err
}
var res []Qdisc
for _, m := range msgs {
msg := nl.DeserializeTcMsg(m)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
// skip qdiscs from other interfaces
if link != nil && msg.Ifindex != index {
continue
}
base := QdiscAttrs{
LinkIndex: int(msg.Ifindex),
Handle: msg.Handle,
Parent: msg.Parent,
Refcnt: msg.Info,
}
var qdisc Qdisc
qdiscType := ""
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.TCA_KIND:
qdiscType = string(attr.Value[:len(attr.Value)-1])
switch qdiscType {
case "pfifo_fast":
qdisc = &PfifoFast{}
case "prio":
qdisc = &Prio{}
case "tbf":
qdisc = &Tbf{}
case "ingress":
qdisc = &Ingress{}
case "htb":
qdisc = &Htb{}
case "netem":
qdisc = &Netem{}
default:
qdisc = &GenericQdisc{QdiscType: qdiscType}
}
case nl.TCA_OPTIONS:
switch qdiscType {
case "pfifo_fast":
// pfifo returns TcPrioMap directly without wrapping it in rtattr
if err := parsePfifoFastData(qdisc, attr.Value); err != nil {
return nil, err
}
case "prio":
// prio returns TcPrioMap directly without wrapping it in rtattr
if err := parsePrioData(qdisc, attr.Value); err != nil {
return nil, err
}
case "tbf":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
if err := parseTbfData(qdisc, data); err != nil {
return nil, err
}
case "htb":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
if err := parseHtbData(qdisc, data); err != nil {
return nil, err
}
case "netem":
if err := parseNetemData(qdisc, attr.Value); err != nil {
return nil, err
}
// no options for ingress
}
}
}
*qdisc.Attrs() = base
res = append(res, qdisc)
}
return res, nil
}
// FilterList gets a list of filters in the system.
// Equivalent to: `tc filter show`.
// Generally retunrs nothing if link and parent are not specified.
func FilterList(link Link, parent uint32) ([]Filter, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETTFILTER, syscall.NLM_F_DUMP)
msg := &nl.TcMsg{
Family: nl.FAMILY_ALL,
Parent: parent,
}
if link != nil {
base := link.Attrs()
ensureIndex(base)
msg.Ifindex = int32(base.Index)
}
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWTFILTER)
if err != nil {
return nil, err
}
var res []Filter
for _, m := range msgs {
msg := nl.DeserializeTcMsg(m)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
base := FilterAttrs{
LinkIndex: int(msg.Ifindex),
Handle: msg.Handle,
Parent: msg.Parent,
}
base.Priority, base.Protocol = MajorMinor(msg.Info)
base.Protocol = nl.Swap16(base.Protocol)
var filter Filter
filterType := ""
detailed := false
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.TCA_KIND:
filterType = string(attr.Value[:len(attr.Value)-1])
switch filterType {
case "u32":
filter = &U32{}
case "fw":
filter = &Fw{}
default:
filter = &GenericFilter{FilterType: filterType}
}
case nl.TCA_OPTIONS:
switch filterType {
case "u32":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
detailed, err = parseU32Data(filter, data)
if err != nil {
return nil, err
}
case "fw":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
detailed, err = parseFwData(filter, data)
if err != nil {
return nil, err
}
}
}
}
// only return the detailed version of the filter
if detailed {
*filter.Attrs() = base
res = append(res, filter)
}
}
return res, nil
}
// ClassList gets a list of classes in the system.
// Equivalent to: `tc class show`.
// Generally returns nothing if link and parent are not specified.
func ClassList(link Link, parent uint32) ([]Class, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETTCLASS, syscall.NLM_F_DUMP)
msg := &nl.TcMsg{
Family: nl.FAMILY_ALL,
Parent: parent,
}
if link != nil {
base := link.Attrs()
ensureIndex(base)
msg.Ifindex = int32(base.Index)
}
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWTCLASS)
if err != nil {
return nil, err
}
var res []Class
for _, m := range msgs {
msg := nl.DeserializeTcMsg(m)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
base := ClassAttrs{
LinkIndex: int(msg.Ifindex),
Handle: msg.Handle,
Parent: msg.Parent,
}
var class Class
classType := ""
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.TCA_KIND:
classType = string(attr.Value[:len(attr.Value)-1])
switch classType {
case "htb":
class = &HtbClass{}
default:
class = &GenericClass{ClassType: classType}
}
case nl.TCA_OPTIONS:
switch classType {
case "htb":
data, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
_, err = parseHtbClassData(class, data)
if err != nil {
return nil, err
}
}
}
}
*class.Attrs() = base
res = append(res, class)
}
return res, nil
}
// RuleList lists rules in the system.
// Equivalent to: ip rule list
func RuleList(family int) ([]Rule, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETRULE, syscall.NLM_F_DUMP|syscall.NLM_F_REQUEST)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWRULE)
if err != nil {
return nil, err
}
native := nl.NativeEndian()
var res = make([]Rule, 0)
for i := range msgs {
msg := nl.DeserializeRtMsg(msgs[i])
attrs, err := nl.ParseRouteAttr(msgs[i][msg.Len():])
if err != nil {
return nil, err
}
rule := NewRule()
rule.RtMsg = msg
for j := range attrs {
switch attrs[j].Attr.Type {
case syscall.RTA_TABLE:
rule.Table = int(native.Uint32(attrs[j].Value[0:4]))
case nl.FRA_SRC:
rule.Src = &net.IPNet{
IP: attrs[j].Value,
Mask: net.CIDRMask(int(msg.Src_len), 8*len(attrs[j].Value)),
}
case nl.FRA_DST:
rule.Dst = &net.IPNet{
IP: attrs[j].Value,
Mask: net.CIDRMask(int(msg.Dst_len), 8*len(attrs[j].Value)),
}
case nl.FRA_FWMARK:
rule.Mark = int(native.Uint32(attrs[j].Value[0:4]))
case nl.FRA_FWMASK:
rule.Mask = int(native.Uint32(attrs[j].Value[0:4]))
case nl.FRA_TUN_ID:
rule.TunID = uint(native.Uint64(attrs[j].Value[0:4]))
case nl.FRA_IIFNAME:
rule.IifName = string(attrs[j].Value[:len(attrs[j].Value)-1])
case nl.FRA_OIFNAME:
rule.OifName = string(attrs[j].Value[:len(attrs[j].Value)-1])
case nl.FRA_SUPPRESS_PREFIXLEN:
i := native.Uint32(attrs[j].Value[0:4])
if i != 0xffffffff {
rule.SuppressPrefixlen = int(i)
}
case nl.FRA_SUPPRESS_IFGROUP:
i := native.Uint32(attrs[j].Value[0:4])
if i != 0xffffffff {
rule.SuppressIfgroup = int(i)
}
case nl.FRA_FLOW:
rule.Flow = int(native.Uint32(attrs[j].Value[0:4]))
case nl.FRA_GOTO:
rule.Goto = int(native.Uint32(attrs[j].Value[0:4]))
case nl.FRA_PRIORITY:
rule.Priority = int(native.Uint32(attrs[j].Value[0:4]))
}
}
res = append(res, *rule)
}
return res, nil
}
// linkDeserialize deserializes a raw message received from netlink into
// a link object.
func linkDeserialize(m []byte) (Link, error) {
msg := nl.DeserializeIfInfomsg(m)
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
base := LinkAttrs{Index: int(msg.Index), Flags: linkFlags(msg.Flags)}
var link Link
linkType := ""
for _, attr := range attrs {
switch attr.Attr.Type {
case syscall.IFLA_LINKINFO:
infos, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return nil, err
}
for _, info := range infos {
switch info.Attr.Type {
case nl.IFLA_INFO_KIND:
linkType = string(info.Value[:len(info.Value)-1])
switch linkType {
case "dummy":
link = &Dummy{}
case "ifb":
link = &Ifb{}
case "bridge":
link = &Bridge{}
case "vlan":
link = &Vlan{}
case "veth":
link = &Veth{}
case "vxlan":
link = &Vxlan{}
case "bond":
link = &Bond{}
case "ipvlan":
link = &IPVlan{}
case "macvlan":
link = &Macvlan{}
case "macvtap":
link = &Macvtap{}
case "gretap":
link = &Gretap{}
default:
link = &GenericLink{LinkType: linkType}
}
case nl.IFLA_INFO_DATA:
data, err := nl.ParseRouteAttr(info.Value)
if err != nil {
return nil, err
}
switch linkType {
case "vlan":
parseVlanData(link, data)
case "vxlan":
parseVxlanData(link, data)
case "bond":
parseBondData(link, data)
case "ipvlan":
parseIPVlanData(link, data)
case "macvlan":
parseMacvlanData(link, data)
case "macvtap":
parseMacvtapData(link, data)
case "gretap":
parseGretapData(link, data)
}
}
}
case syscall.IFLA_ADDRESS:
var nonzero bool
for _, b := range attr.Value {
if b != 0 {
nonzero = true
}
}
if nonzero {
base.HardwareAddr = attr.Value[:]
}
case syscall.IFLA_IFNAME:
base.Name = string(attr.Value[:len(attr.Value)-1])
case syscall.IFLA_MTU:
base.MTU = int(native.Uint32(attr.Value[0:4]))
case syscall.IFLA_LINK:
base.ParentIndex = int(native.Uint32(attr.Value[0:4]))
case syscall.IFLA_MASTER:
base.MasterIndex = int(native.Uint32(attr.Value[0:4]))
case syscall.IFLA_TXQLEN:
base.TxQLen = int(native.Uint32(attr.Value[0:4]))
case syscall.IFLA_IFALIAS:
base.Alias = string(attr.Value[:len(attr.Value)-1])
}
}
// Links that don't have IFLA_INFO_KIND are hardware devices
if link == nil {
link = &Device{}
}
*link.Attrs() = base
return link, nil
}
// AddrList gets a list of IP addresses in the system.
// Equivalent to: `ip addr show`.
// The list can be filtered by link and ip family.
func AddrList(link Link, family int) ([]Addr, error) {
req := nl.NewNetlinkRequest(syscall.RTM_GETADDR, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWADDR)
if err != nil {
return nil, err
}
index := 0
if link != nil {
base := link.Attrs()
ensureIndex(base)
index = base.Index
}
var res []Addr
for _, m := range msgs {
msg := nl.DeserializeIfAddrmsg(m)
if link != nil && msg.Index != uint32(index) {
// Ignore messages from other interfaces
continue
}
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
if err != nil {
return nil, err
}
var local, dst *net.IPNet
var addr Addr
for _, attr := range attrs {
switch attr.Attr.Type {
case syscall.IFA_ADDRESS:
dst = &net.IPNet{
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
}
case syscall.IFA_LOCAL:
local = &net.IPNet{
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
}
case syscall.IFA_LABEL:
addr.Label = string(attr.Value[:len(attr.Value)-1])
case IFA_FLAGS:
addr.Flags = int(native.Uint32(attr.Value[0:4]))
}
}
// IFA_LOCAL should be there but if not, fall back to IFA_ADDRESS
if local != nil {
addr.IPNet = local
} else {
addr.IPNet = dst
}
addr.Scope = int(msg.Scope)
res = append(res, addr)
}
return res, nil
}
// AddrSubscribe takes a chan down which notifications will be sent
// when addresses change. Close the 'done' chan to stop subscription.
func AddrSubscribe(ch chan<- AddrUpdate, done <-chan struct{}) error {
s, err := nl.Subscribe(syscall.NETLINK_ROUTE, syscall.RTNLGRP_IPV4_IFADDR, syscall.RTNLGRP_IPV6_IFADDR)
if err != nil {
return err
}
if done != nil {
go func() {
<-done
s.Close()
}()
}
go func() {
defer close(ch)
for {
msgs, err := s.Receive()
if err != nil {
log.Printf("netlink.AddrSubscribe: Receive() error: %v", err)
return
}
for _, m := range msgs {
msgType := m.Header.Type
if msgType != syscall.RTM_NEWADDR && msgType != syscall.RTM_DELADDR {
log.Printf("netlink.AddrSubscribe: bad message type: %d", msgType)
continue
}
msg := nl.DeserializeIfAddrmsg(m.Data)
attrs, err := nl.ParseRouteAttr(m.Data[msg.Len():])
if err != nil {
log.Printf("netlink.AddrSubscribe: nl.ParseRouteAttr() error: %v", err)
return
}
var local, dst *net.IPNet
var addr Addr
for _, attr := range attrs {
switch attr.Attr.Type {
case syscall.IFA_ADDRESS:
dst = &net.IPNet{
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
}
case syscall.IFA_LOCAL:
local = &net.IPNet{
IP: attr.Value,
Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
}
case syscall.IFA_LABEL:
addr.Label = string(attr.Value[:len(attr.Value)-1])
case IFA_FLAGS:
addr.Flags = int(native.Uint32(attr.Value[0:4]))
}
}
// IFA_LOCAL should be there but if not, fall back to IFA_ADDRESS
if local != nil {
addr.IPNet = local
} else {
addr.IPNet = dst
}
ch <- AddrUpdate{LinkAddress: *addr.IPNet, LinkIndex: int(msg.Index), NewAddr: msgType == syscall.RTM_NEWADDR}
}
}
}()
return nil
}