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node_addressing.go
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node_addressing.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package linux
import (
"net"
"github.com/vishvananda/netlink"
"github.com/cilium/cilium/pkg/cidr"
"github.com/cilium/cilium/pkg/datapath/types"
"github.com/cilium/cilium/pkg/defaults"
"github.com/cilium/cilium/pkg/ip"
"github.com/cilium/cilium/pkg/node"
"github.com/cilium/cilium/pkg/option"
)
// FIXME: This currently maps to the code in pkg/node/node_address.go. That
// code should really move into this package.
func listLocalAddresses(family int) ([]net.IP, error) {
var addresses []net.IP
ipsToExclude := node.GetExcludedIPs()
addrs, err := netlink.AddrList(nil, family)
if err != nil {
return nil, err
}
for _, addr := range addrs {
if addr.Scope > option.Config.AddressScopeMax {
continue
}
if ip.IsExcluded(ipsToExclude, addr.IP) {
continue
}
if addr.IP.IsLoopback() || addr.IP.IsLinkLocalUnicast() {
continue
}
addresses = append(addresses, addr.IP)
}
if option.Config.AddressScopeMax < int(netlink.SCOPE_LINK) {
if hostDevice, err := netlink.LinkByName(defaults.HostDevice); hostDevice != nil && err == nil {
addrs, err = netlink.AddrList(hostDevice, family)
if err != nil {
return nil, err
}
for _, addr := range addrs {
if addr.Scope == int(netlink.SCOPE_LINK) {
addresses = append(addresses, addr.IP)
}
}
}
}
return addresses, nil
}
type addressFamilyIPv4 struct{}
func (a *addressFamilyIPv4) Router() net.IP {
return node.GetInternalIPv4Router()
}
func (a *addressFamilyIPv4) PrimaryExternal() net.IP {
return node.GetIPv4()
}
func (a *addressFamilyIPv4) AllocationCIDR() *cidr.CIDR {
return node.GetIPv4AllocRange()
}
func (a *addressFamilyIPv4) LocalAddresses() ([]net.IP, error) {
return listLocalAddresses(netlink.FAMILY_V4)
}
// LoadBalancerNodeAddresses returns all IPv4 node addresses on which the
// loadbalancer should implement HostPort and NodePort services.
func (a *addressFamilyIPv4) LoadBalancerNodeAddresses() []net.IP {
addrs := node.GetNodePortIPv4Addrs()
addrs = append(addrs, net.IPv4zero)
return addrs
}
type addressFamilyIPv6 struct{}
func (a *addressFamilyIPv6) Router() net.IP {
return node.GetIPv6Router()
}
func (a *addressFamilyIPv6) PrimaryExternal() net.IP {
return node.GetIPv6()
}
func (a *addressFamilyIPv6) AllocationCIDR() *cidr.CIDR {
return node.GetIPv6AllocRange()
}
func (a *addressFamilyIPv6) LocalAddresses() ([]net.IP, error) {
return listLocalAddresses(netlink.FAMILY_V6)
}
// LoadBalancerNodeAddresses returns all IPv6 node addresses on which the
// loadbalancer should implement HostPort and NodePort services.
func (a *addressFamilyIPv6) LoadBalancerNodeAddresses() []net.IP {
addrs := node.GetNodePortIPv6Addrs()
addrs = append(addrs, net.IPv6zero)
return addrs
}
type linuxNodeAddressing struct {
ipv6 addressFamilyIPv6
ipv4 addressFamilyIPv4
}
// NewNodeAddressing returns a new linux node addressing model
func NewNodeAddressing() types.NodeAddressing {
return &linuxNodeAddressing{}
}
func (n *linuxNodeAddressing) IPv6() types.NodeAddressingFamily {
return &n.ipv6
}
func (n *linuxNodeAddressing) IPv4() types.NodeAddressingFamily {
return &n.ipv4
}