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setup_ipv4.go
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setup_ipv4.go
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package bridge
import (
"fmt"
"io/ioutil"
"path/filepath"
log "github.com/Sirupsen/logrus"
"github.com/docker/libnetwork/types"
"github.com/vishvananda/netlink"
)
func setupBridgeIPv4(config *networkConfiguration, i *bridgeInterface) error {
addrv4, _, err := i.addresses()
if err != nil {
return fmt.Errorf("failed to retrieve bridge interface addresses: %v", err)
}
if !types.CompareIPNet(addrv4.IPNet, config.AddressIPv4) {
if addrv4.IPNet != nil {
if err := netlink.AddrDel(i.Link, &addrv4); err != nil {
return fmt.Errorf("failed to remove current ip address from bridge: %v", err)
}
}
log.Debugf("Assigning address to bridge interface %s: %s", config.BridgeName, config.AddressIPv4)
if err := netlink.AddrAdd(i.Link, &netlink.Addr{IPNet: config.AddressIPv4}); err != nil {
return &IPv4AddrAddError{IP: config.AddressIPv4, Err: err}
}
}
// Store bridge network and default gateway
i.bridgeIPv4 = config.AddressIPv4
i.gatewayIPv4 = config.AddressIPv4.IP
return nil
}
func setupGatewayIPv4(config *networkConfiguration, i *bridgeInterface) error {
if !i.bridgeIPv4.Contains(config.DefaultGatewayIPv4) {
return &ErrInvalidGateway{}
}
// Store requested default gateway
i.gatewayIPv4 = config.DefaultGatewayIPv4
return nil
}
func setupLoopbackAdressesRouting(config *networkConfiguration, i *bridgeInterface) error {
sysPath := filepath.Join("/proc/sys/net/ipv4/conf", config.BridgeName, "route_localnet")
ipv4LoRoutingData, err := ioutil.ReadFile(sysPath)
if err != nil {
return fmt.Errorf("Cannot read IPv4 local routing setup: %v", err)
}
// Enable loopback adresses routing only if it isn't already enabled
if ipv4LoRoutingData[0] != '1' {
if err := ioutil.WriteFile(sysPath, []byte{'1', '\n'}, 0644); err != nil {
return fmt.Errorf("Unable to enable local routing for hairpin mode: %v", err)
}
}
return nil
}