mirror of https://github.com/vishvananda/netlink
115 lines
2.7 KiB
Go
115 lines
2.7 KiB
Go
package netlink
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"strings"
|
|
"syscall"
|
|
|
|
"github.com/vishvananda/netlink/nl"
|
|
)
|
|
|
|
// AddrAdd will add an IP address to a link device.
|
|
// Equivalent to: `ip addr add $addr dev $link`
|
|
func AddrAdd(link Link, addr *Addr) error {
|
|
|
|
req := nl.NewNetlinkRequest(syscall.RTM_NEWADDR, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
|
|
return addrHandle(link, addr, req)
|
|
}
|
|
|
|
// AddrDel will delete an IP address from a link device.
|
|
// Equivalent to: `ip addr del $addr dev $link`
|
|
func AddrDel(link Link, addr *Addr) error {
|
|
req := nl.NewNetlinkRequest(syscall.RTM_DELADDR, syscall.NLM_F_ACK)
|
|
return addrHandle(link, addr, req)
|
|
}
|
|
|
|
func addrHandle(link Link, addr *Addr, req *nl.NetlinkRequest) error {
|
|
base := link.Attrs()
|
|
if addr.Label != "" && !strings.HasPrefix(addr.Label, base.Name) {
|
|
return fmt.Errorf("label must begin with interface name")
|
|
}
|
|
ensureIndex(base)
|
|
|
|
family := nl.GetIPFamily(addr.IP)
|
|
|
|
msg := nl.NewIfAddrmsg(family)
|
|
msg.Index = uint32(base.Index)
|
|
prefixlen, _ := addr.Mask.Size()
|
|
msg.Prefixlen = uint8(prefixlen)
|
|
req.AddData(msg)
|
|
|
|
var addrData []byte
|
|
if family == FAMILY_V4 {
|
|
addrData = addr.IP.To4()
|
|
} else {
|
|
addrData = addr.IP.To16()
|
|
}
|
|
|
|
localData := nl.NewRtAttr(syscall.IFA_LOCAL, addrData)
|
|
req.AddData(localData)
|
|
|
|
addressData := nl.NewRtAttr(syscall.IFA_ADDRESS, addrData)
|
|
req.AddData(addressData)
|
|
|
|
if addr.Label != "" {
|
|
labelData := nl.NewRtAttr(syscall.IFA_LABEL, nl.ZeroTerminated(addr.Label))
|
|
req.AddData(labelData)
|
|
}
|
|
|
|
_, err := req.Execute(syscall.NETLINK_ROUTE, 0)
|
|
return err
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
res := make([]Addr, 0)
|
|
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 addr Addr
|
|
for _, attr := range attrs {
|
|
switch attr.Attr.Type {
|
|
case syscall.IFA_ADDRESS:
|
|
addr.IPNet = &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])
|
|
}
|
|
}
|
|
res = append(res, addr)
|
|
}
|
|
|
|
return res, nil
|
|
}
|