forked from moby/libnetwork
/
neigh_linux.go
138 lines (110 loc) · 2.88 KB
/
neigh_linux.go
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package osl
import (
"bytes"
"fmt"
"net"
"github.com/vishvananda/netlink"
)
// NeighOption is a function option type to set interface options
type NeighOption func(nh *neigh)
type neigh struct {
dstIP net.IP
dstMac net.HardwareAddr
linkName string
linkDst string
family int
}
func (n *networkNamespace) findNeighbor(dstIP net.IP, dstMac net.HardwareAddr) *neigh {
n.Lock()
defer n.Unlock()
for _, nh := range n.neighbors {
if nh.dstIP.Equal(dstIP) && bytes.Equal(nh.dstMac, dstMac) {
return nh
}
}
return nil
}
func (n *networkNamespace) DeleteNeighbor(dstIP net.IP, dstMac net.HardwareAddr) error {
nh := n.findNeighbor(dstIP, dstMac)
if nh == nil {
return fmt.Errorf("could not find the neighbor entry to delete")
}
return nsInvoke(n.nsPath(), func(nsFD int) error { return nil }, func(callerFD int) error {
var iface netlink.Link
if nh.linkDst != "" {
var err error
iface, err = netlink.LinkByName(nh.linkDst)
if err != nil {
return fmt.Errorf("could not find interface with destination name %s: %v",
nh.linkDst, err)
}
}
nlnh := &netlink.Neigh{
IP: dstIP,
State: netlink.NUD_PERMANENT,
Family: nh.family,
}
if nlnh.Family > 0 {
nlnh.HardwareAddr = dstMac
nlnh.Flags = netlink.NTF_SELF
}
if nh.linkDst != "" {
nlnh.LinkIndex = iface.Attrs().Index
}
if err := netlink.NeighDel(nlnh); err != nil {
return fmt.Errorf("could not delete neighbor entry: %v", err)
}
for i, nh := range n.neighbors {
if nh.dstIP.Equal(dstIP) && bytes.Equal(nh.dstMac, dstMac) {
n.neighbors = append(n.neighbors[:i], n.neighbors[i+1:]...)
}
}
return nil
})
}
func (n *networkNamespace) AddNeighbor(dstIP net.IP, dstMac net.HardwareAddr, options ...NeighOption) error {
nh := n.findNeighbor(dstIP, dstMac)
if nh != nil {
// If it exists silently return
return nil
}
nh = &neigh{
dstIP: dstIP,
dstMac: dstMac,
}
nh.processNeighOptions(options...)
if nh.linkName != "" {
nh.linkDst = n.findDst(nh.linkName, false)
if nh.linkDst == "" {
return fmt.Errorf("could not find the interface with name %s", nh.linkName)
}
}
return nsInvoke(n.nsPath(), func(nsFD int) error { return nil }, func(callerFD int) error {
var iface netlink.Link
if nh.linkDst != "" {
var err error
iface, err = netlink.LinkByName(nh.linkDst)
if err != nil {
return fmt.Errorf("could not find interface with destination name %s: %v",
nh.linkDst, err)
}
}
nlnh := &netlink.Neigh{
IP: dstIP,
HardwareAddr: dstMac,
State: netlink.NUD_PERMANENT,
Family: nh.family,
}
if nlnh.Family > 0 {
nlnh.Flags = netlink.NTF_SELF
}
if nh.linkDst != "" {
nlnh.LinkIndex = iface.Attrs().Index
}
if err := netlink.NeighSet(nlnh); err != nil {
return fmt.Errorf("could not add neighbor entry: %v", err)
}
n.neighbors = append(n.neighbors, nh)
return nil
})
}