mirror of
https://github.com/k3s-io/k3s.git
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e8381db778
* Update Kubernetes to v1.21.0 * Update to golang v1.16.2 * Update dependent modules to track with upstream * Switch to upstream flannel * Track changes to upstream cloud-controller-manager and FeatureGates Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// +build !windows
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// Copyright 2015 flannel 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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// +build !windows
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package hostgw
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import (
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"fmt"
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"sync"
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"github.com/flannel-io/flannel/backend"
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"github.com/flannel-io/flannel/pkg/ip"
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"github.com/flannel-io/flannel/subnet"
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"github.com/vishvananda/netlink"
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"golang.org/x/net/context"
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)
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func init() {
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backend.Register("host-gw", New)
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}
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type HostgwBackend struct {
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sm subnet.Manager
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extIface *backend.ExternalInterface
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}
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func New(sm subnet.Manager, extIface *backend.ExternalInterface) (backend.Backend, error) {
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if !extIface.ExtAddr.Equal(extIface.IfaceAddr) {
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return nil, fmt.Errorf("your PublicIP differs from interface IP, meaning that probably you're on a NAT, which is not supported by host-gw backend")
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}
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be := &HostgwBackend{
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sm: sm,
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extIface: extIface,
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}
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return be, nil
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}
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func (be *HostgwBackend) RegisterNetwork(ctx context.Context, wg *sync.WaitGroup, config *subnet.Config) (backend.Network, error) {
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n := &backend.RouteNetwork{
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SimpleNetwork: backend.SimpleNetwork{
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ExtIface: be.extIface,
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},
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SM: be.sm,
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BackendType: "host-gw",
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Mtu: be.extIface.Iface.MTU,
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LinkIndex: be.extIface.Iface.Index,
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}
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n.GetRoute = func(lease *subnet.Lease) *netlink.Route {
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return &netlink.Route{
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Dst: lease.Subnet.ToIPNet(),
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Gw: lease.Attrs.PublicIP.ToIP(),
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LinkIndex: n.LinkIndex,
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}
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}
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attrs := subnet.LeaseAttrs{
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PublicIP: ip.FromIP(be.extIface.ExtAddr),
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BackendType: "host-gw",
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}
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l, err := be.sm.AcquireLease(ctx, &attrs)
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switch err {
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case nil:
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n.SubnetLease = l
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case context.Canceled, context.DeadlineExceeded:
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return nil, err
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default:
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return nil, fmt.Errorf("failed to acquire lease: %v", err)
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}
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return n, nil
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}
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