/
driver.go
374 lines (301 loc) · 9.19 KB
/
driver.go
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package simplebridge
import (
"flag"
"fmt"
"net"
"strconv"
"sync"
log "github.com/Sirupsen/logrus"
"github.com/docker/docker/network"
"github.com/docker/docker/pkg/iptables"
"github.com/docker/docker/sandbox"
"github.com/docker/docker/state"
"github.com/vishvananda/netlink"
)
const maxVethName = 8
type BridgeDriver struct {
state state.State
mutex sync.Mutex
}
func (d *BridgeDriver) GetNetwork(id string) (network.Network, error) {
return d.loadNetwork(id)
}
func (d *BridgeDriver) Restore(s state.State) error {
d.state = s
return nil
}
func (d *BridgeDriver) loadEndpoint(name, endpoint string) (*BridgeEndpoint, error) {
iface, err := d.getEndpointProperty(name, endpoint, "interfaceName")
if err != nil {
return nil, err
}
hwAddr, err := d.getEndpointProperty(name, endpoint, "hwAddr")
if err != nil {
return nil, err
}
mtu, err := d.getEndpointProperty(name, endpoint, "mtu")
if err != nil {
return nil, err
}
mtuInt, _ := strconv.ParseUint(mtu, 10, 32)
network, err := d.loadNetwork(name)
if err != nil {
return nil, err
}
return &BridgeEndpoint{
ID: endpoint,
interfaceName: iface,
hwAddr: hwAddr,
mtu: uint(mtuInt),
network: network,
}, nil
}
func (d *BridgeDriver) saveEndpoint(name string, ep *BridgeEndpoint) error {
if err := d.setEndpointProperty(name, ep.ID, "interfaceName", ep.ID); err != nil {
return err
}
if err := d.setEndpointProperty(name, ep.ID, "hwAddr", ep.hwAddr); err != nil {
return err
}
if err := d.setEndpointProperty(name, ep.ID, "mtu", strconv.Itoa(int(ep.mtu))); err != nil {
return err
}
return nil
}
func vethNameTooLong(name string) bool {
return len(name) > maxVethName // FIXME write a test for this
}
// discovery driver? should it be hooked here or in the core?
func (d *BridgeDriver) Link(id, name string, s sandbox.Sandbox, replace bool) (network.Endpoint, error) {
if vethNameTooLong(name) {
return nil, fmt.Errorf("name %q is too long, must be 8 characters", name)
}
d.mutex.Lock()
defer d.mutex.Unlock()
network, err := d.loadNetwork(id)
if err != nil {
return nil, err
}
ep := &BridgeEndpoint{
network: network,
ID: name,
}
if ep, err := d.loadEndpoint(id, name); ep != nil && err != nil && !replace {
return nil, fmt.Errorf("Endpoint %q already taken", name)
}
if err := d.createEndpoint(id, name); err != nil {
fmt.Println("[fail] d.createEndpoint")
return nil, err
}
if err := ep.configure(name, s); err != nil {
fmt.Println("[fail] ep.configure")
return nil, err
}
if err := d.saveEndpoint(id, ep); err != nil {
fmt.Println("[fail] d.saveEndpoint")
return nil, err
}
return ep, nil
}
func (d *BridgeDriver) Unlink(netid, name string, sb sandbox.Sandbox) error {
d.mutex.Lock()
defer d.mutex.Unlock()
ep, err := d.loadEndpoint(netid, name)
if err != nil {
return fmt.Errorf("No endpoint for name %q: %v", name, err)
}
if err := ep.deconfigure(name); err != nil {
return err
}
if err := d.removeEndpoint(netid, name); err != nil {
return err
}
return nil
}
func (d *BridgeDriver) saveNetwork(id string, bridge *BridgeNetwork) error {
// FIXME allocator, address will be broken if not saved
if err := d.setNetworkProperty(id, "bridgeInterface", bridge.bridge.Name); err != nil {
return err
}
if err := d.setNetworkProperty(id, "address", bridge.network.String()); err != nil {
return err
}
return nil
}
func (d *BridgeDriver) loadNetwork(id string) (*BridgeNetwork, error) {
iface, err := d.getNetworkProperty(id, "bridgeInterface")
if err != nil {
return nil, err
}
addr, err := d.getNetworkProperty(id, "address")
if err != nil {
return nil, err
}
ip, ipNet, err := net.ParseCIDR(addr)
ipNet.IP = ip
return &BridgeNetwork{
// DEMO FIXME
//vxlan: &netlink.Vxlan{LinkAttrs: netlink.LinkAttrs{Name: "vx" + iface}},
bridge: &netlink.Bridge{LinkAttrs: netlink.LinkAttrs{Name: iface}},
ID: id,
driver: d,
network: ipNet,
ipallocator: NewIPAllocator(id, ipNet, nil, nil),
}, nil
}
func (d *BridgeDriver) AddNetwork(id string, args []string) error {
// FIXME this should be abstracted from the network driver
fs := flag.NewFlagSet("simplebridge", flag.ContinueOnError)
// FIXME need to figure out a way to prop usage
fs.Usage = func() {}
peer := fs.String("peer", "", "VXLan peer to contact")
vlanid := fs.Uint("vid", 42, "VXLan VLAN ID")
port := fs.Uint("port", 0, "VXLan Tunneling Port")
if err := fs.Parse(args); err != nil {
return err
}
if err := d.createNetwork(id); err != nil {
return err
}
bridge, err := d.createBridge(id, *vlanid, *port, *peer)
if err != nil {
return err
}
if err := d.saveNetwork(id, bridge); err != nil {
return err
}
return nil
}
func (d *BridgeDriver) RemoveNetwork(id string) error {
bridge, err := d.loadNetwork(id)
if err != nil {
return err
}
if err := d.removeNetwork(id); err != nil {
return err
}
return bridge.destroy()
}
func (d *BridgeDriver) createBridge(id string, vlanid uint, port uint, peer string) (*BridgeNetwork, error) {
dockerbridge := &netlink.Bridge{netlink.LinkAttrs{Name: id}}
if err := netlink.LinkAdd(dockerbridge); err != nil {
log.Printf("Error add bridge %#v", dockerbridge)
return nil, err
}
addr, err := GetBridgeIP()
if err != nil {
return nil, err
}
if err := netlink.AddrAdd(dockerbridge, &netlink.Addr{IPNet: addr}); err != nil {
log.Println("Error add addr bridge")
return nil, err
}
if err := netlink.LinkSetUp(dockerbridge); err != nil {
log.Println("Error up bridge")
return nil, err
}
if err := setupIPTables(id, addr, true, true); err != nil {
return nil, err
}
var vxlan *netlink.Vxlan
if peer != "" {
vxlan = &netlink.Vxlan{
// DEMO FIXME: name collisions, better error recovery
LinkAttrs: netlink.LinkAttrs{Name: "vx" + id},
VxlanId: int(vlanid),
Group: net.ParseIP(peer),
Port: int(port),
Learning: true,
Proxy: true,
L2miss: true,
}
if err := netlink.LinkAdd(vxlan); err != nil {
log.Println("Error linkadd")
return nil, err
}
if err := netlink.LinkSetMaster(vxlan, dockerbridge); err != nil {
log.Println("Error linksetmaster")
return nil, err
}
if err := netlink.LinkSetUp(vxlan); err != nil {
log.Println("Error linksetmaster")
return nil, err
}
}
return &BridgeNetwork{
vxlan: vxlan,
bridge: dockerbridge,
ID: id,
driver: d,
network: addr,
ipallocator: NewIPAllocator(id, addr, nil, nil),
}, nil
}
func (d *BridgeDriver) destroyBridge(b *netlink.Bridge, v *netlink.Vxlan) error {
// DEMO FIXME
if v != nil {
if err := netlink.LinkDel(v); err != nil {
return err
}
}
return netlink.LinkDel(b)
}
// FIXME remove last two parameters
func setupIPTables(bridgeIface string, addr net.Addr, icc, ipmasq bool) error {
// Enable NAT
if ipmasq {
natArgs := []string{"POSTROUTING", "-t", "nat", "-s", addr.String(), "!", "-o", bridgeIface, "-j", "MASQUERADE"}
if !iptables.Exists(natArgs...) {
if output, err := iptables.Raw(append([]string{"-I"}, natArgs...)...); err != nil {
return fmt.Errorf("Unable to enable network bridge NAT: %s", err)
} else if len(output) != 0 {
return &iptables.ChainError{Chain: "POSTROUTING", Output: output}
}
}
}
var (
args = []string{"FORWARD", "-i", bridgeIface, "-o", bridgeIface, "-j"}
acceptArgs = append(args, "ACCEPT")
dropArgs = append(args, "DROP")
)
if !icc {
iptables.Raw(append([]string{"-D"}, acceptArgs...)...)
if !iptables.Exists(dropArgs...) {
log.Debugf("Disable inter-container communication")
if output, err := iptables.Raw(append([]string{"-I"}, dropArgs...)...); err != nil {
return fmt.Errorf("Unable to prevent intercontainer communication: %s", err)
} else if len(output) != 0 {
return fmt.Errorf("Error disabling intercontainer communication: %s", output)
}
}
} else {
iptables.Raw(append([]string{"-D"}, dropArgs...)...)
if !iptables.Exists(acceptArgs...) {
log.Debugf("Enable inter-container communication")
if output, err := iptables.Raw(append([]string{"-I"}, acceptArgs...)...); err != nil {
return fmt.Errorf("Unable to allow intercontainer communication: %s", err)
} else if len(output) != 0 {
return fmt.Errorf("Error enabling intercontainer communication: %s", output)
}
}
}
// Accept all non-intercontainer outgoing packets
outgoingArgs := []string{"FORWARD", "-i", bridgeIface, "!", "-o", bridgeIface, "-j", "ACCEPT"}
if !iptables.Exists(outgoingArgs...) {
if output, err := iptables.Raw(append([]string{"-I"}, outgoingArgs...)...); err != nil {
return fmt.Errorf("Unable to allow outgoing packets: %s", err)
} else if len(output) != 0 {
return &iptables.ChainError{Chain: "FORWARD outgoing", Output: output}
}
}
// Accept incoming packets for existing connections
existingArgs := []string{"FORWARD", "-o", bridgeIface, "-m", "conntrack", "--ctstate", "RELATED,ESTABLISHED", "-j", "ACCEPT"}
if !iptables.Exists(existingArgs...) {
if output, err := iptables.Raw(append([]string{"-I"}, existingArgs...)...); err != nil {
return fmt.Errorf("Unable to allow incoming packets: %s", err)
} else if len(output) != 0 {
return &iptables.ChainError{Chain: "FORWARD incoming", Output: output}
}
}
return nil
}