289 lines
7.3 KiB
Go
289 lines
7.3 KiB
Go
|
package netlink
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"log"
|
||
|
|
"net"
|
||
|
|
"strings"
|
||
|
|
"syscall"
|
||
|
|
|
||
|
|
"github.com/vishvananda/netlink/nl"
|
||
|
|
"github.com/vishvananda/netns"
|
||
|
|
)
|
||
|
|
|
||
|
|
// IFA_FLAGS is a u32 attribute.
|
||
|
|
const IFA_FLAGS = 0x8
|
||
|
|
|
||
|
|
// 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 {
|
||
|
|
return pkgHandle.AddrAdd(link, addr)
|
||
|
|
}
|
||
|
|
|
||
|
|
// AddrAdd will add an IP address to a link device.
|
||
|
|
// Equivalent to: `ip addr add $addr dev $link`
|
||
|
|
func (h *Handle) AddrAdd(link Link, addr *Addr) error {
|
||
|
|
req := h.newNetlinkRequest(syscall.RTM_NEWADDR, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.NLM_F_ACK)
|
||
|
|
return h.addrHandle(link, addr, req)
|
||
|
|
}
|
||
|
|
|
||
|
|
// AddrReplace will replace (or, if not present, add) an IP address on a link device.
|
||
|
|
// Equivalent to: `ip addr replace $addr dev $link`
|
||
|
|
func AddrReplace(link Link, addr *Addr) error {
|
||
|
|
return pkgHandle.AddrReplace(link, addr)
|
||
|
|
}
|
||
|
|
|
||
|
|
// AddrReplace will replace (or, if not present, add) an IP address on a link device.
|
||
|
|
// Equivalent to: `ip addr replace $addr dev $link`
|
||
|
|
func (h *Handle) AddrReplace(link Link, addr *Addr) error {
|
||
|
|
req := h.newNetlinkRequest(syscall.RTM_NEWADDR, syscall.NLM_F_CREATE|syscall.NLM_F_REPLACE|syscall.NLM_F_ACK)
|
||
|
|
return h.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 {
|
||
|
|
return pkgHandle.AddrDel(link, addr)
|
||
|
|
}
|
||
|
|
|
||
|
|
// AddrDel will delete an IP address from a link device.
|
||
|
|
// Equivalent to: `ip addr del $addr dev $link`
|
||
|
|
func (h *Handle) AddrDel(link Link, addr *Addr) error {
|
||
|
|
req := h.newNetlinkRequest(syscall.RTM_DELADDR, syscall.NLM_F_ACK)
|
||
|
|
return h.addrHandle(link, addr, req)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (h *Handle) 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")
|
||
|
|
}
|
||
|
|
h.ensureIndex(base)
|
||
|
|
|
||
|
|
family := nl.GetIPFamily(addr.IP)
|
||
|
|
|
||
|
|
msg := nl.NewIfAddrmsg(family)
|
||
|
|
msg.Index = uint32(base.Index)
|
||
|
|
msg.Scope = uint8(addr.Scope)
|
||
|
|
prefixlen, _ := addr.Mask.Size()
|
||
|
|
msg.Prefixlen = uint8(prefixlen)
|
||
|
|
req.AddData(msg)
|
||
|
|
|
||
|
|
var localAddrData []byte
|
||
|
|
if family == FAMILY_V4 {
|
||
|
|
localAddrData = addr.IP.To4()
|
||
|
|
} else {
|
||
|
|
localAddrData = addr.IP.To16()
|
||
|
|
}
|
||
|
|
|
||
|
|
localData := nl.NewRtAttr(syscall.IFA_LOCAL, localAddrData)
|
||
|
|
req.AddData(localData)
|
||
|
|
var peerAddrData []byte
|
||
|
|
if addr.Peer != nil {
|
||
|
|
if family == FAMILY_V4 {
|
||
|
|
peerAddrData = addr.Peer.IP.To4()
|
||
|
|
} else {
|
||
|
|
peerAddrData = addr.Peer.IP.To16()
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
peerAddrData = localAddrData
|
||
|
|
}
|
||
|
|
|
||
|
|
addressData := nl.NewRtAttr(syscall.IFA_ADDRESS, peerAddrData)
|
||
|
|
req.AddData(addressData)
|
||
|
|
|
||
|
|
if addr.Flags != 0 {
|
||
|
|
if addr.Flags <= 0xff {
|
||
|
|
msg.IfAddrmsg.Flags = uint8(addr.Flags)
|
||
|
|
} else {
|
||
|
|
b := make([]byte, 4)
|
||
|
|
native.PutUint32(b, uint32(addr.Flags))
|
||
|
|
flagsData := nl.NewRtAttr(IFA_FLAGS, b)
|
||
|
|
req.AddData(flagsData)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if addr.Broadcast != nil {
|
||
|
|
req.AddData(nl.NewRtAttr(syscall.IFA_BROADCAST, addr.Broadcast))
|
||
|
|
}
|
||
|
|
|
||
|
|
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) {
|
||
|
|
return pkgHandle.AddrList(link, family)
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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 (h *Handle) AddrList(link Link, family int) ([]Addr, error) {
|
||
|
|
req := h.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
|
||
|
|
}
|
||
|
|
|
||
|
|
indexFilter := 0
|
||
|
|
if link != nil {
|
||
|
|
base := link.Attrs()
|
||
|
|
h.ensureIndex(base)
|
||
|
|
indexFilter = base.Index
|
||
|
|
}
|
||
|
|
|
||
|
|
var res []Addr
|
||
|
|
for _, m := range msgs {
|
||
|
|
addr, msgFamily, ifindex, err := parseAddr(m)
|
||
|
|
if err != nil {
|
||
|
|
return res, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if link != nil && ifindex != indexFilter {
|
||
|
|
// Ignore messages from other interfaces
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
if family != FAMILY_ALL && msgFamily != family {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
res = append(res, addr)
|
||
|
|
}
|
||
|
|
|
||
|
|
return res, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func parseAddr(m []byte) (addr Addr, family, index int, err error) {
|
||
|
|
msg := nl.DeserializeIfAddrmsg(m)
|
||
|
|
|
||
|
|
family = -1
|
||
|
|
index = -1
|
||
|
|
|
||
|
|
attrs, err1 := nl.ParseRouteAttr(m[msg.Len():])
|
||
|
|
if err1 != nil {
|
||
|
|
err = err1
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
family = int(msg.Family)
|
||
|
|
index = int(msg.Index)
|
||
|
|
|
||
|
|
var local, dst *net.IPNet
|
||
|
|
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)),
|
||
|
|
}
|
||
|
|
addr.Peer = dst
|
||
|
|
case syscall.IFA_LOCAL:
|
||
|
|
local = &net.IPNet{
|
||
|
|
IP: attr.Value,
|
||
|
|
Mask: net.CIDRMask(int(msg.Prefixlen), 8*len(attr.Value)),
|
||
|
|
}
|
||
|
|
addr.IPNet = local
|
||
|
|
case syscall.IFA_BROADCAST:
|
||
|
|
addr.Broadcast = 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]))
|
||
|
|
case nl.IFA_CACHEINFO:
|
||
|
|
ci := nl.DeserializeIfaCacheInfo(attr.Value)
|
||
|
|
addr.PreferedLft = int(ci.IfaPrefered)
|
||
|
|
addr.ValidLft = int(ci.IfaValid)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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)
|
||
|
|
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
type AddrUpdate struct {
|
||
|
|
LinkAddress net.IPNet
|
||
|
|
LinkIndex int
|
||
|
|
Flags int
|
||
|
|
Scope int
|
||
|
|
PreferedLft int
|
||
|
|
ValidLft int
|
||
|
|
NewAddr bool // true=added false=deleted
|
||
|
|
}
|
||
|
|
|
||
|
|
// 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 {
|
||
|
|
return addrSubscribe(netns.None(), netns.None(), ch, done)
|
||
|
|
}
|
||
|
|
|
||
|
|
// AddrSubscribeAt works like AddrSubscribe plus it allows the caller
|
||
|
|
// to choose the network namespace in which to subscribe (ns).
|
||
|
|
func AddrSubscribeAt(ns netns.NsHandle, ch chan<- AddrUpdate, done <-chan struct{}) error {
|
||
|
|
return addrSubscribe(ns, netns.None(), ch, done)
|
||
|
|
}
|
||
|
|
|
||
|
|
func addrSubscribe(newNs, curNs netns.NsHandle, ch chan<- AddrUpdate, done <-chan struct{}) error {
|
||
|
|
s, err := nl.SubscribeAt(newNs, curNs, 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
|
||
|
|
}
|
||
|
|
|
||
|
|
addr, _, ifindex, err := parseAddr(m.Data)
|
||
|
|
if err != nil {
|
||
|
|
log.Printf("netlink.AddrSubscribe: could not parse address: %v", err)
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
ch <- AddrUpdate{LinkAddress: *addr.IPNet,
|
||
|
|
LinkIndex: ifindex,
|
||
|
|
NewAddr: msgType == syscall.RTM_NEWADDR,
|
||
|
|
Flags: addr.Flags,
|
||
|
|
Scope: addr.Scope,
|
||
|
|
PreferedLft: addr.PreferedLft,
|
||
|
|
ValidLft: addr.ValidLft}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|