129 lines
3.0 KiB
Go
129 lines
3.0 KiB
Go
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package netlink
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import (
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"fmt"
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"net"
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"strings"
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"syscall"
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"github.com/vishvananda/netlink/nl"
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)
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// AddrAdd will add an IP address to a link device.
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// Equivalent to: `ip addr add $addr dev $link`
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func AddrAdd(link Link, addr *Addr) error {
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req := nl.NewNetlinkRequest(syscall.RTM_NEWADDR, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
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return addrHandle(link, addr, req)
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}
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// AddrDel will delete an IP address from a link device.
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// Equivalent to: `ip addr del $addr dev $link`
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func AddrDel(link Link, addr *Addr) error {
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req := nl.NewNetlinkRequest(syscall.RTM_DELADDR, syscall.NLM_F_ACK)
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return addrHandle(link, addr, req)
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}
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func addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error {
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base := link.Attrs()
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if addr.Label != "" && !strings.HasPrefix(addr.Label, base.Name) {
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return fmt.Errorf("label must begin with interface name")
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}
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ensureIndex(base)
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family := nl.GetIPFamily(addr.IP)
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msg := nl.NewIfAddrmsg(family)
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msg.Index = uint32(base.Index)
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prefixlen, _ := addr.Mask.Size()
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msg.Prefixlen = uint8(prefixlen)
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req.AddData(msg)
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var addrData []byte
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if family == FAMILY_V4 {
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addrData = addr.IP.To4()
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} else {
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addrData = addr.IP.To16()
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}
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localData := nl.NewRtAttr(syscall.IFA_LOCAL, addrData)
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req.AddData(localData)
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addressData := nl.NewRtAttr(syscall.IFA_ADDRESS, addrData)
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req.AddData(addressData)
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if addr.Label != "" {
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labelData := nl.NewRtAttr(syscall.IFA_LABEL, nl.ZeroTerminated(addr.Label))
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req.AddData(labelData)
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}
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_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
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return err
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}
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// AddrList gets a list of IP addresses in the system.
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// Equivalent to: `ip addr show`.
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// The list can be filtered by link and ip family.
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func AddrList(link Link, family int) ([]Addr, error) {
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req := nl.NewNetlinkRequest(syscall.RTM_GETADDR, syscall.NLM_F_DUMP)
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msg := nl.NewIfInfomsg(family)
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req.AddData(msg)
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msgs, err := req.Execute(syscall.NETLINK_ROUTE, syscall.RTM_NEWADDR)
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if err != nil {
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return nil, err
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}
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index := 0
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if link != nil {
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base := link.Attrs()
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ensureIndex(base)
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index = base.Index
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}
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var res []Addr
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for _, m := range msgs {
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msg := nl.DeserializeIfAddrmsg(m)
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if link != nil && msg.Index != uint32(index) {
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// Ignore messages from other interfaces
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continue
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}
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attrs, err := nl.ParseRouteAttr(m[msg.Len():])
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if err != nil {
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return nil, err
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}
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var local, dst *net.IPNet
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var addr Addr
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for _, attr := range attrs {
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switch attr.Attr.Type {
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case syscall.IFA_ADDRESS:
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dst = &net.IPNet{
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IP: attr.Value,
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Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
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}
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case syscall.IFA_LOCAL:
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local = &net.IPNet{
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IP: attr.Value,
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Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
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}
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case syscall.IFA_LABEL:
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addr.Label = string(attr.Value[:len(attr.Value)-1])
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}
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}
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// IFA_LOCAL should be there but if not, fall back to IFA_ADDRESS
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if local != nil {
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addr.IPNet = local
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} else {
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addr.IPNet = dst
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}
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res = append(res, addr)
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}
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return res, nil
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}
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