func cmdAdd(args *skel.CmdArgs) error {
n, err := loadConf(args.StdinData)
if err != nil {
return err
}
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", netns, err)
}
defer netns.Close()
if err = createMacvlan(n, args.IfName, netns); err != nil {
return err
}
// run the IPAM plugin and get back the config to apply
result, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
if err != nil {
return err
}
if result.IP4 == nil {
return errors.New("IPAM plugin returned missing IPv4 config")
}
err = netns.Do(func(_ ns.NetNS) error {
return ipam.ConfigureIface(args.IfName, result)
})
if err != nil {
return err
}
result.DNS = n.DNS
return result.Print()
}
func cmdAdd(args *skel.CmdArgs) error {
conf := NetConf{}
if err := json.Unmarshal(args.StdinData, &conf); err != nil {
return fmt.Errorf("failed to load netconf: %v", err)
}
if err := ip.EnableIP4Forward(); err != nil {
return fmt.Errorf("failed to enable forwarding: %v", err)
}
// run the IPAM plugin and get back the config to apply
result, err := ipam.ExecAdd(conf.IPAM.Type, args.StdinData)
if err != nil {
return err
}
if result.IP4 == nil {
return errors.New("IPAM plugin returned missing IPv4 config")
}
hostVethName, err := setupContainerVeth(args.Netns, args.IfName, conf.MTU, result)
if err != nil {
return err
}
if err = setupHostVeth(hostVethName, result.IP4); err != nil {
return err
}
if conf.IPMasq {
chain := utils.FormatChainName(conf.Name, args.ContainerID)
comment := utils.FormatComment(conf.Name, args.ContainerID)
if err = ip.SetupIPMasq(&result.IP4.IP, chain, comment); err != nil {
return err
}
}
result.DNS = conf.DNS
return result.Print()
}
func cmdAdd(args *skel.CmdArgs) error {
// Unmarshall the network config, and perform validation
conf := NetConf{}
if err := json.Unmarshal(args.StdinData, &conf); err != nil {
return fmt.Errorf("failed to load netconf: %v", err)
}
ConfigureLogging(conf.LogLevel)
workload, orchestrator, err := GetIdentifiers(args)
if err != nil {
return err
}
logger := CreateContextLogger(workload)
// Allow the hostname to be overridden by the network config
if conf.Hostname != "" {
hostname = conf.Hostname
}
logger.WithFields(log.Fields{
"Orchestrator": orchestrator,
"Node": hostname,
}).Info("Extracted identifiers")
logger.WithFields(log.Fields{"NetConfg": conf}).Info("Loaded CNI NetConf")
calicoClient, err := CreateClient(conf)
if err != nil {
return err
}
// Always check if there's an existing endpoint.
endpoints, err := calicoClient.WorkloadEndpoints().List(api.WorkloadEndpointMetadata{
Node: hostname,
Orchestrator: orchestrator,
Workload: workload})
if err != nil {
return err
}
logger.Debugf("Retrieved endpoints: %v", endpoints)
var endpoint *api.WorkloadEndpoint
if len(endpoints.Items) == 1 {
endpoint = &endpoints.Items[0]
}
fmt.Fprintf(os.Stderr, "Calico CNI checking for existing endpoint: %v\n", endpoint)
// Collect the result in this variable - this is ultimately what gets "returned" by this function by printing
// it to stdout.
var result *types.Result
// If running under Kubernetes then branch off into the kubernetes code, otherwise handle everything in this
// function.
if orchestrator == "k8s" {
if result, err = k8s.CmdAddK8s(args, conf, hostname, calicoClient, endpoint); err != nil {
return err
}
} else {
// Default CNI behavior - use the CNI network name as the Calico profile.
profileID := conf.Name
if endpoint != nil {
// There is an existing endpoint - no need to create another.
// This occurs when adding an existing container to a new CNI network
// Find the IP address from the endpoint and use that in the response.
// Don't create the veth or do any networking.
// Just update the profile on the endpoint. The profile will be created if needed during the
// profile processing step.
fmt.Fprintf(os.Stderr, "Calico CNI appending profile: %s\n", profileID)
endpoint.Spec.Profiles = append(endpoint.Spec.Profiles, profileID)
result, err = CreateResultFromEndpoint(endpoint)
logger.WithField("result", result).Debug("Created result from endpoint")
if err != nil {
return err
}
} else {
// There's no existing endpoint, so we need to do the following:
// 1) Call the configured IPAM plugin to get IP address(es)
// 2) Configure the Calico endpoint
// 3) Create the veth, configuring it on both the host and container namespace.
// 1) Run the IPAM plugin and make sure there's an IP address returned.
logger.WithFields(log.Fields{"paths": os.Getenv("CNI_PATH"),
"type": conf.IPAM.Type}).Debug("Looking for IPAM plugin in paths")
result, err = ipam.ExecAdd(conf.IPAM.Type, args.StdinData)
logger.WithField("result", result).Info("Got result from IPAM plugin")
if err != nil {
return err
}
// Parse endpoint labels passed in by Mesos, and store in a map.
labels := map[string]string{}
for _, label := range conf.Args.Mesos.NetworkInfo.Labels.Labels {
labels[label.Key] = label.Value
}
// 2) Create the endpoint object
endpoint = api.NewWorkloadEndpoint()
endpoint.Metadata.Name = args.IfName
endpoint.Metadata.Node = hostname
endpoint.Metadata.Orchestrator = orchestrator
endpoint.Metadata.Workload = workload
endpoint.Metadata.Labels = labels
endpoint.Spec.Profiles = []string{profileID}
logger.WithField("endpoint", endpoint).Debug("Populated endpoint (without nets)")
if err = PopulateEndpointNets(endpoint, result); err != nil {
// Cleanup IP allocation and return the error.
ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return err
}
logger.WithField("endpoint", endpoint).Info("Populated endpoint (with nets)")
fmt.Fprintf(os.Stderr, "Calico CNI using IPs: %s\n", endpoint.Spec.IPNetworks)
// 3) Set up the veth
hostVethName, contVethMac, err := DoNetworking(args, conf, result, logger, "")
if err != nil {
// Cleanup IP allocation and return the error.
ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return err
}
logger.WithFields(log.Fields{
"HostVethName": hostVethName,
"ContainerVethMac": contVethMac,
}).Info("Networked namespace")
mac, err := net.ParseMAC(contVethMac)
if err != nil {
// Cleanup IP allocation and return the error.
ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return err
}
endpoint.Spec.MAC = &cnet.MAC{HardwareAddr: mac}
endpoint.Spec.InterfaceName = hostVethName
}
// Write the endpoint object (either the newly created one, or the updated one with a new ProfileIDs).
if _, err := calicoClient.WorkloadEndpoints().Apply(endpoint); err != nil {
// Cleanup IP allocation and return the error.
ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return err
}
logger.WithField("endpoint", endpoint).Info("Wrote endpoint to datastore")
}
// Handle profile creation - this is only done if there isn't a specific policy handler.
if conf.Policy.PolicyType == "" {
logger.Debug("Handling profiles")
// Start by checking if the profile already exists. If it already exists then there is no work to do.
// The CNI plugin never updates a profile.
exists := true
_, err = calicoClient.Profiles().Get(api.ProfileMetadata{Name: conf.Name})
if err != nil {
_, ok := err.(errors.ErrorResourceDoesNotExist)
if ok {
exists = false
} else {
// Cleanup IP allocation and return the error.
ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return err
}
}
if !exists {
// The profile doesn't exist so needs to be created. The rules vary depending on whether k8s is being used.
// Under k8s (without full policy support) the rule is permissive and allows all traffic.
// Otherwise, incoming traffic is only allowed from profiles with the same tag.
fmt.Fprintf(os.Stderr, "Calico CNI creating profile: %s\n", conf.Name)
var inboundRules []api.Rule
if orchestrator == "k8s" {
inboundRules = []api.Rule{{Action: "allow"}}
} else {
inboundRules = []api.Rule{{Action: "allow", Source: api.EntityRule{Tag: conf.Name}}}
}
profile := &api.Profile{
Metadata: api.ProfileMetadata{
Name: conf.Name,
Tags: []string{conf.Name},
},
Spec: api.ProfileSpec{
EgressRules: []api.Rule{{Action: "allow"}},
IngressRules: inboundRules,
},
}
logger.WithField("profile", profile).Info("Creating profile")
if _, err := calicoClient.Profiles().Create(profile); err != nil {
// Cleanup IP allocation and return the error.
ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return err
}
}
}
return result.Print()
}
func cmdAdd(args *skel.CmdArgs) error {
n, err := loadNetConf(args.StdinData)
if err != nil {
return err
}
br, err := setupBridge(n)
if err != nil {
return err
}
if err = setupVeth(args.Netns, br, args.IfName, n.MTU, n.HairpinMode); err != nil {
return err
}
// run the IPAM plugin and get back the config to apply
result, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
if err != nil {
return err
}
if result.IP4 == nil {
return errors.New("IPAM plugin returned missing IPv4 config")
}
if result.IP4.Gateway == nil && n.IsGW {
result.IP4.Gateway = calcGatewayIP(&result.IP4.IP)
}
err = ns.WithNetNSPath(args.Netns, false, func(hostNS *os.File) error {
return ipam.ConfigureIface(args.IfName, result)
})
if err != nil {
return err
}
if n.IsGW {
gwn := &net.IPNet{
IP: result.IP4.Gateway,
Mask: result.IP4.IP.Mask,
}
if err = ensureBridgeAddr(br, gwn); err != nil {
return err
}
if err := ip.EnableIP4Forward(); err != nil {
return fmt.Errorf("failed to enable forwarding: %v", err)
}
}
if n.IPMasq {
chain := utils.FormatChainName(n.Name, args.ContainerID)
comment := utils.FormatComment(n.Name, args.ContainerID)
if err = ip.SetupIPMasq(ip.Network(&result.IP4.IP), chain, comment); err != nil {
return err
}
}
result.DNS = n.DNS
return result.Print()
}
// CmdAddK8s performs the "ADD" operation on a kubernetes pod
// Having kubernetes code in its own file avoids polluting the mainline code. It's expected that the kubernetes case will
// more special casing than the mainline code.
func CmdAddK8s(args *skel.CmdArgs, conf utils.NetConf, hostname string, calicoClient *calicoclient.Client, endpoint *api.WorkloadEndpoint) (*types.Result, error) {
var err error
var result *types.Result
k8sArgs := utils.K8sArgs{}
err = types.LoadArgs(args.Args, &k8sArgs)
if err != nil {
return nil, err
}
utils.ConfigureLogging(conf.LogLevel)
workload, orchestrator, err := utils.GetIdentifiers(args)
if err != nil {
return nil, err
}
logger := utils.CreateContextLogger(workload)
logger.WithFields(log.Fields{
"Orchestrator": orchestrator,
"Node": hostname,
}).Info("Extracted identifiers for CmdAddK8s")
if endpoint != nil {
// This happens when Docker or the node restarts. K8s calls CNI with the same parameters as before.
// Do the networking (since the network namespace was destroyed and recreated).
// There's an existing endpoint - no need to create another. Find the IP address from the endpoint
// and use that in the response.
result, err = utils.CreateResultFromEndpoint(endpoint)
if err != nil {
return nil, err
}
logger.WithField("result", result).Debug("Created result from existing endpoint")
// If any labels changed whilst the container was being restarted, they will be picked up by the policy
// controller so there's no need to update the labels here.
} else {
client, err := newK8sClient(conf, logger)
if err != nil {
return nil, err
}
logger.WithField("client", client).Debug("Created Kubernetes client")
if conf.IPAM.Type == "host-local" && strings.EqualFold(conf.IPAM.Subnet, "usePodCidr") {
// We've been told to use the "host-local" IPAM plugin with the Kubernetes podCidr for this node.
// Replace the actual value in the args.StdinData as that's what's passed to the IPAM plugin.
fmt.Fprintf(os.Stderr, "Calico CNI fetching podCidr from Kubernetes\n")
var stdinData map[string]interface{}
if err := json.Unmarshal(args.StdinData, &stdinData); err != nil {
return nil, err
}
podCidr, err := getPodCidr(client, conf, hostname)
if err != nil {
return nil, err
}
logger.WithField("podCidr", podCidr).Info("Fetched podCidr")
stdinData["ipam"].(map[string]interface{})["subnet"] = podCidr
fmt.Fprintf(os.Stderr, "Calico CNI passing podCidr to host-local IPAM: %s\n", podCidr)
args.StdinData, err = json.Marshal(stdinData)
if err != nil {
return nil, err
}
logger.WithField("stdin", args.StdinData).Debug("Updated stdin data")
}
// Run the IPAM plugin
logger.Debugf("Calling IPAM plugin %s", conf.IPAM.Type)
result, err = ipam.ExecAdd(conf.IPAM.Type, args.StdinData)
if err != nil {
return nil, err
}
logger.Debugf("IPAM plugin returned: %+v", result)
// Create the endpoint object and configure it.
endpoint = api.NewWorkloadEndpoint()
endpoint.Metadata.Name = args.IfName
endpoint.Metadata.Node = hostname
endpoint.Metadata.Orchestrator = orchestrator
endpoint.Metadata.Workload = workload
endpoint.Metadata.Labels = make(map[string]string)
// Set the profileID according to whether Kubernetes policy is required.
// If it's not, then just use the network name (which is the normal behavior)
// otherwise use one based on the Kubernetes pod's Namespace.
if conf.Policy.PolicyType == "k8s" {
endpoint.Spec.Profiles = []string{fmt.Sprintf("k8s_ns.%s", k8sArgs.K8S_POD_NAMESPACE)}
} else {
endpoint.Spec.Profiles = []string{conf.Name}
}
// Populate the endpoint with the output from the IPAM plugin.
if err = utils.PopulateEndpointNets(endpoint, result); err != nil {
// Cleanup IP allocation and return the error.
utils.ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return nil, err
}
logger.WithField("endpoint", endpoint).Info("Populated endpoint")
// Only attempt to fetch the labels from Kubernetes if the policy type has been set to "k8s"
// This allows users to run the plugin under Kubernetes without needing it to access the Kubernetes API
if conf.Policy.PolicyType == "k8s" {
labels, err := getK8sLabels(client, k8sArgs)
if err != nil {
// Cleanup IP allocation and return the error.
utils.ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return nil, err
}
logger.WithField("labels", labels).Info("Fetched K8s labels")
endpoint.Metadata.Labels = labels
}
}
fmt.Fprintf(os.Stderr, "Calico CNI using IPs: %s\n", endpoint.Spec.IPNetworks)
// Whether the endpoint existed or not, the veth needs (re)creating.
hostVethName := k8sbackend.VethNameForWorkload(workload)
_, contVethMac, err := utils.DoNetworking(args, conf, result, logger, hostVethName)
if err != nil {
// Cleanup IP allocation and return the error.
logger.Errorf("Error setting up networking: %s", err)
utils.ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return nil, err
}
mac, err := net.ParseMAC(contVethMac)
if err != nil {
// Cleanup IP allocation and return the error.
logger.Errorf("Error parsing MAC (%s): %s", contVethMac, err)
utils.ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return nil, err
}
endpoint.Spec.MAC = &cnet.MAC{HardwareAddr: mac}
endpoint.Spec.InterfaceName = hostVethName
logger.WithField("endpoint", endpoint).Info("Added Mac and interface name to endpoint")
// Write the endpoint object (either the newly created one, or the updated one)
if _, err := calicoClient.WorkloadEndpoints().Apply(endpoint); err != nil {
// Cleanup IP allocation and return the error.
utils.ReleaseIPAllocation(logger, conf.IPAM.Type, args.StdinData)
return nil, err
}
logger.Info("Wrote updated endpoint to datastore")
return result, nil
}
func cmdAdd(args *skel.CmdArgs) error {
n, err := loadNetConf(args.StdinData)
if err != nil {
return err
}
if n.IsDefaultGW {
n.IsGW = true
}
br, err := setupBridge(n)
if err != nil {
return err
}
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
if err = setupVeth(netns, br, args.IfName, n.MTU, n.HairpinMode); err != nil {
return err
}
// run the IPAM plugin and get back the config to apply
result, err := ipam.ExecAdd(n.IPAM.Type, args.StdinData)
if err != nil {
return err
}
// TODO: make this optional when IPv6 is supported
if result.IP4 == nil {
return errors.New("IPAM plugin returned missing IPv4 config")
}
if result.IP4.Gateway == nil && n.IsGW {
result.IP4.Gateway = calcGatewayIP(&result.IP4.IP)
}
if err := netns.Do(func(_ ns.NetNS) error {
// set the default gateway if requested
if n.IsDefaultGW {
_, defaultNet, err := net.ParseCIDR("0.0.0.0/0")
if err != nil {
return err
}
for _, route := range result.IP4.Routes {
if defaultNet.String() == route.Dst.String() {
if route.GW != nil && !route.GW.Equal(result.IP4.Gateway) {
return fmt.Errorf(
"isDefaultGateway ineffective because IPAM sets default route via %q",
route.GW,
)
}
}
}
result.IP4.Routes = append(
result.IP4.Routes,
types.Route{Dst: *defaultNet, GW: result.IP4.Gateway},
)
// TODO: IPV6
}
if err := ipam.ConfigureIface(args.IfName, result); err != nil {
return err
}
if err := ip.SetHWAddrByIP(args.IfName, result.IP4.IP.IP, nil /* TODO IPv6 */); err != nil {
return err
}
return nil
}); err != nil {
return err
}
if n.IsGW {
gwn := &net.IPNet{
IP: result.IP4.Gateway,
Mask: result.IP4.IP.Mask,
}
if err = ensureBridgeAddr(br, gwn, n.ForceAddress); err != nil {
return err
}
if err := ip.SetHWAddrByIP(n.BrName, gwn.IP, nil /* TODO IPv6 */); err != nil {
return err
}
if err := ip.EnableIP4Forward(); err != nil {
return fmt.Errorf("failed to enable forwarding: %v", err)
}
}
if n.IPMasq {
chain := utils.FormatChainName(n.Name, args.ContainerID)
comment := utils.FormatComment(n.Name, args.ContainerID)
if err = ip.SetupIPMasq(ip.Network(&result.IP4.IP), chain, comment); err != nil {
return err
}
}
result.DNS = n.DNS
return result.Print()
}