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// +build linux
// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ip
import (
"fmt"
"net"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/current"
"github.com/vishvananda/netlink"
)
func ValidateExpectedInterfaceIPs(ifName string, resultIPs []*current.IPConfig) error {
// Ensure ips
for _, ips := range resultIPs {
ourAddr := netlink.Addr{IPNet: &ips.Address}
match := false
link, err := netlink.LinkByName(ifName)
if err != nil {
return fmt.Errorf("Cannot find container link %v", ifName)
}
addrList, err := netlink.AddrList(link, netlink.FAMILY_ALL)
if err != nil {
return fmt.Errorf("Cannot obtain List of IP Addresses")
}
for _, addr := range addrList {
if addr.Equal(ourAddr) {
match = true
break
}
}
if match == false {
return fmt.Errorf("Failed to match addr %v on interface %v", ourAddr, ifName)
}
// Convert the host/prefixlen to just prefix for route lookup.
_, ourPrefix, err := net.ParseCIDR(ourAddr.String())
findGwy := &netlink.Route{Dst: ourPrefix}
routeFilter := netlink.RT_FILTER_DST
var family int
switch {
case ips.Version == "4":
family = netlink.FAMILY_V4
case ips.Version == "6":
family = netlink.FAMILY_V6
default:
return fmt.Errorf("Invalid IP Version %v for interface %v", ips.Version, ifName)
}
gwy, err := netlink.RouteListFiltered(family, findGwy, routeFilter)
if err != nil {
return fmt.Errorf("Error %v trying to find Gateway %v for interface %v", err, ips.Gateway, ifName)
}
if gwy == nil {
return fmt.Errorf("Failed to find Gateway %v for interface %v", ips.Gateway, ifName)
}
}
return nil
}
func ValidateExpectedRoute(resultRoutes []*types.Route) error {
// Ensure that each static route in prevResults is found in the routing table
for _, route := range resultRoutes {
find := &netlink.Route{Dst: &route.Dst, Gw: route.GW}
routeFilter := netlink.RT_FILTER_DST | netlink.RT_FILTER_GW
var family int
switch {
case route.Dst.IP.To4() != nil:
family = netlink.FAMILY_V4
// Default route needs Dst set to nil
if route.Dst.String() == "0.0.0.0/0" {
find = &netlink.Route{Dst: nil, Gw: route.GW}
routeFilter = netlink.RT_FILTER_DST
}
case len(route.Dst.IP) == net.IPv6len:
family = netlink.FAMILY_V6
// Default route needs Dst set to nil
if route.Dst.String() == "::/0" {
find = &netlink.Route{Dst: nil, Gw: route.GW}
routeFilter = netlink.RT_FILTER_DST
}
default:
return fmt.Errorf("Invalid static route found %v", route)
}
wasFound, err := netlink.RouteListFiltered(family, find, routeFilter)
if err != nil {
return fmt.Errorf("Expected Route %v not route table lookup error %v", route, err)
}
if wasFound == nil {
return fmt.Errorf("Expected Route %v not found in routing table", route)
}
}
return nil
}
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