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//go:build linux
// +build linux
package overlay
import (
"fmt"
"net"
"syscall"
"github.com/docker/docker/libnetwork/driverapi"
"github.com/docker/docker/libnetwork/ns"
"github.com/docker/docker/libnetwork/types"
"github.com/gogo/protobuf/proto"
"github.com/sirupsen/logrus"
)
// 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)
}
if n.secure && len(d.keys) == 0 {
return fmt.Errorf("cannot join secure network: encryption keys not present")
}
nlh := ns.NlHandle()
if n.secure && !nlh.SupportsNetlinkFamily(syscall.NETLINK_XFRM) {
return fmt.Errorf("cannot join secure network: required modules to install IPSEC rules are missing on host")
}
s := n.getSubnetforIP(ep.addr)
if s == nil {
return fmt.Errorf("could not find subnet for endpoint %s", eid)
}
if err := n.joinSandbox(s, false, true); err != nil {
return fmt.Errorf("network sandbox join failed: %v", err)
}
sbox := n.sandbox()
overlayIfName, containerIfName, err := createVethPair()
if err != nil {
return err
}
ep.ifName = containerIfName
if err = d.writeEndpointToStore(ep); err != nil {
return fmt.Errorf("failed to update overlay endpoint %.7s to local data store: %v", ep.id, err)
}
// 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))
mtu := n.maxMTU()
veth, err := nlh.LinkByName(overlayIfName)
if err != nil {
return fmt.Errorf("cound not find link by name %s: %v", overlayIfName, err)
}
err = nlh.LinkSetMTU(veth, mtu)
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 = nlh.LinkByName(containerIfName)
if err != nil {
return fmt.Errorf("could not find link by name %s: %v", containerIfName, err)
}
err = nlh.LinkSetMTU(veth, mtu)
if err != nil {
return err
}
if err = nlh.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 {
logrus.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.peerAdd(nid, eid, ep.addr.IP, ep.addr.Mask, ep.mac, net.ParseIP(d.advertiseAddress), false, false, true)
if err = d.checkEncryption(nid, nil, true, true); err != nil {
logrus.Warn(err)
}
buf, err := proto.Marshal(&PeerRecord{
EndpointIP: ep.addr.String(),
EndpointMAC: ep.mac.String(),
TunnelEndpointIP: d.advertiseAddress,
})
if err != nil {
return err
}
if err := jinfo.AddTableEntry(ovPeerTable, eid, buf); err != nil {
logrus.Errorf("overlay: Failed adding table entry to joininfo: %v", err)
}
return nil
}
func (d *driver) DecodeTableEntry(tablename string, key string, value []byte) (string, map[string]string) {
if tablename != ovPeerTable {
logrus.Errorf("DecodeTableEntry: unexpected table name %s", tablename)
return "", nil
}
var peer PeerRecord
if err := proto.Unmarshal(value, &peer); err != nil {
logrus.Errorf("DecodeTableEntry: failed to unmarshal peer record for key %s: %v", key, err)
return "", nil
}
return key, map[string]string{
"Host IP": peer.TunnelEndpointIP,
}
}
func (d *driver) EventNotify(etype driverapi.EventType, nid, tableName, key string, value []byte) {
if tableName != ovPeerTable {
logrus.Errorf("Unexpected table notification for table %s received", tableName)
return
}
eid := key
var peer PeerRecord
if err := proto.Unmarshal(value, &peer); err != nil {
logrus.Errorf("Failed to unmarshal peer record: %v", err)
return
}
// Ignore local peers. We already know about them and they
// should not be added to vxlan fdb.
if peer.TunnelEndpointIP == d.advertiseAddress {
return
}
addr, err := types.ParseCIDR(peer.EndpointIP)
if err != nil {
logrus.Errorf("Invalid peer IP %s received in event notify", peer.EndpointIP)
return
}
mac, err := net.ParseMAC(peer.EndpointMAC)
if err != nil {
logrus.Errorf("Invalid mac %s received in event notify", peer.EndpointMAC)
return
}
vtep := net.ParseIP(peer.TunnelEndpointIP)
if vtep == nil {
logrus.Errorf("Invalid VTEP %s received in event notify", peer.TunnelEndpointIP)
return
}
if etype == driverapi.Delete {
d.peerDelete(nid, eid, addr.IP, addr.Mask, mac, vtep, false)
return
}
d.peerAdd(nid, eid, addr.IP, addr.Mask, mac, vtep, false, false, false)
}
// 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)
}
d.peerDelete(nid, eid, ep.addr.IP, ep.addr.Mask, ep.mac, net.ParseIP(d.advertiseAddress), true)
n.leaveSandbox()
return nil
}
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