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joinleave.go
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joinleave.go
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package overlay
import (
"fmt"
"net"
log "github.com/Sirupsen/logrus"
"github.com/docker/libnetwork/driverapi"
"github.com/docker/libnetwork/types"
"github.com/vishvananda/netlink"
)
// Join method is invoked when a Sandbox is attached to an endpoint.
func (d *driver) Join(nid, eid string, sboxKey string, jinfo driverapi.JoinInfo, options map[string]interface{}) error {
if err := validateID(nid, eid); err != nil {
return err
}
n := d.network(nid)
if n == nil {
return fmt.Errorf("could not find network with id %s", nid)
}
ep := n.endpoint(eid)
if ep == nil {
return fmt.Errorf("could not find endpoint with id %s", eid)
}
s := n.getSubnetforIP(ep.addr)
if s == nil {
return fmt.Errorf("could not find subnet for endpoint %s", eid)
}
if err := n.obtainVxlanID(s); err != nil {
return fmt.Errorf("couldn't get vxlan id for %q: %v", s.subnetIP.String(), err)
}
if err := n.joinSandbox(); err != nil {
return fmt.Errorf("network sandbox join failed: %v", err)
}
if err := n.joinSubnetSandbox(s); err != nil {
return fmt.Errorf("subnet sandbox join failed for %q: %v", s.subnetIP.String(), err)
}
// joinSubnetSandbox gets called when an endpoint comes up on a new subnet in the
// overlay network. Hence the Endpoint count should be updated outside joinSubnetSandbox
n.incEndpointCount()
sbox := n.sandbox()
overlayIfName, containerIfName, err := createVethPair()
if err != nil {
return err
}
ep.ifName = overlayIfName
// Set the container interface and its peer MTU to 1450 to allow
// for 50 bytes vxlan encap (inner eth header(14) + outer IP(20) +
// outer UDP(8) + vxlan header(8))
veth, err := netlink.LinkByName(overlayIfName)
if err != nil {
return fmt.Errorf("cound not find link by name %s: %v", overlayIfName, err)
}
err = netlink.LinkSetMTU(veth, vxlanVethMTU)
if err != nil {
return err
}
if err := sbox.AddInterface(overlayIfName, "veth",
sbox.InterfaceOptions().Master(s.brName)); err != nil {
return fmt.Errorf("could not add veth pair inside the network sandbox: %v", err)
}
veth, err = netlink.LinkByName(containerIfName)
if err != nil {
return fmt.Errorf("could not find link by name %s: %v", containerIfName, err)
}
err = netlink.LinkSetMTU(veth, vxlanVethMTU)
if err != nil {
return err
}
if err := netlink.LinkSetHardwareAddr(veth, ep.mac); err != nil {
return fmt.Errorf("could not set mac address (%v) to the container interface: %v", ep.mac, err)
}
for _, sub := range n.subnets {
if sub == s {
continue
}
if err := jinfo.AddStaticRoute(sub.subnetIP, types.NEXTHOP, s.gwIP.IP); err != nil {
log.Errorf("Adding subnet %s static route in network %q failed\n", s.subnetIP, n.id)
}
}
if iNames := jinfo.InterfaceName(); iNames != nil {
err = iNames.SetNames(containerIfName, "eth")
if err != nil {
return err
}
}
d.peerDbAdd(nid, eid, ep.addr.IP, ep.addr.Mask, ep.mac,
net.ParseIP(d.bindAddress), true)
d.pushLocalEndpointEvent("join", nid, eid)
return nil
}
// Leave method is invoked when a Sandbox detaches from an endpoint.
func (d *driver) Leave(nid, eid string) error {
if err := validateID(nid, eid); err != nil {
return err
}
n := d.network(nid)
if n == nil {
return fmt.Errorf("could not find network with id %s", nid)
}
ep := n.endpoint(eid)
if ep == nil {
return types.InternalMaskableErrorf("could not find endpoint with id %s", eid)
}
if d.notifyCh != nil {
d.notifyCh <- ovNotify{
action: "leave",
nid: nid,
eid: eid,
}
}
n.leaveSandbox()
return nil
}