forked from github/multus-cni
120 lines
3.6 KiB
Go
120 lines
3.6 KiB
Go
// Copyright (c) 2019 Multus Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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package netutils
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import (
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"github.com/containernetworking/cni/pkg/skel"
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cnitypes "github.com/containernetworking/cni/pkg/types"
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"github.com/containernetworking/cni/pkg/types/current"
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"github.com/containernetworking/plugins/pkg/ns"
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"github.com/intel/multus-cni/logging"
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"github.com/vishvananda/netlink"
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"net"
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"strings"
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)
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// DeleteDefaultGW removes the default gateway from marked interfaces.
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func DeleteDefaultGW(args *skel.CmdArgs, ifName string, res *cnitypes.Result) (*current.Result, error) {
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result, err := current.NewResultFromResult(*res)
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if err != nil {
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return nil, logging.Errorf("DeleteDefaultGW: Error creating new from current CNI result: %v", err)
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}
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netns, err := ns.GetNS(args.Netns)
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if err != nil {
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return nil, logging.Errorf("DeleteDefaultGW: Error getting namespace %v", err)
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}
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defer netns.Close()
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err = netns.Do(func(_ ns.NetNS) error {
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var err error
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link, _ := netlink.LinkByName(ifName)
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routes, _ := netlink.RouteList(link, netlink.FAMILY_ALL)
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for _, nlroute := range routes {
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if nlroute.Dst == nil {
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err = netlink.RouteDel(&nlroute)
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}
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}
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return err
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})
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var newRoutes []*cnitypes.Route
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for _, route := range result.Routes {
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if mask, _ := route.Dst.Mask.Size(); mask != 0 {
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newRoutes = append(newRoutes, route)
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}
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}
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result.Routes = newRoutes
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return result, err
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}
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// SetDefaultGW adds a default gateway on a specific interface
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func SetDefaultGW(args *skel.CmdArgs, ifName string, gateways []net.IP, res *cnitypes.Result) (*current.Result, error) {
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// Use the current CNI result...
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result, err := current.NewResultFromResult(*res)
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if err != nil {
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return nil, logging.Errorf("SetDefaultGW: Error creating new CNI result from current: %v", err)
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}
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// This ensures we're acting within the net namespace for the pod.
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netns, err := ns.GetNS(args.Netns)
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if err != nil {
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return nil, logging.Errorf("SetDefaultGW: Error getting namespace %v", err)
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}
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defer netns.Close()
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var newResultDefaultRoutes []*cnitypes.Route
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// Do this within the net namespace.
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err = netns.Do(func(_ ns.NetNS) error {
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var err error
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// Pick up the link info as we need the index.
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link, _ := netlink.LinkByName(ifName)
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// Cycle through all the desired gateways.
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for _, gw := range gateways {
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// Create a new route (note: dst is nil by default)
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logging.Debugf("SetDefaultGW: Adding default route on %v (index: %v) to %v", ifName, link.Attrs().Index, gw)
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newDefaultRoute := netlink.Route{
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LinkIndex: link.Attrs().Index,
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Gw: gw,
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}
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// Build a new element for the results route
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// Set a correct CIDR depending on IP type
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_, dstipnet, _ := net.ParseCIDR("::0/0")
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if strings.Count(gw.String(), ":") < 2 {
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_, dstipnet, _ = net.ParseCIDR("0.0.0.0/0")
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}
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newResultDefaultRoutes = append(newResultDefaultRoutes, &cnitypes.Route{Dst: *dstipnet, GW: gw})
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// Perform the creation of the default route....
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err = netlink.RouteAdd(&newDefaultRoute)
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if err != nil {
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logging.Errorf("SetDefaultGW: Error adding route: %v", err)
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}
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}
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return err
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})
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result.Routes = newResultDefaultRoutes
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return result, err
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}
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