68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
package bridge
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
|
|
log "github.com/Sirupsen/logrus"
|
|
"github.com/vishvananda/netlink"
|
|
)
|
|
|
|
var bridgeNetworks []*net.IPNet
|
|
|
|
func init() {
|
|
// Here we don't follow the convention of using the 1st IP of the range for the gateway.
|
|
// This is to use the same gateway IPs as the /24 ranges, which predate the /16 ranges.
|
|
// In theory this shouldn't matter - in practice there's bound to be a few scripts relying
|
|
// on the internal addressing or other stupid things like that.
|
|
// They shouldn't, but hey, let's not break them unless we really have to.
|
|
for _, addr := range []string{
|
|
"172.17.42.1/16", // Don't use 172.16.0.0/16, it conflicts with EC2 DNS 172.16.0.23
|
|
"10.0.42.1/16", // Don't even try using the entire /8, that's too intrusive
|
|
"10.1.42.1/16",
|
|
"10.42.42.1/16",
|
|
"172.16.42.1/24",
|
|
"172.16.43.1/24",
|
|
"172.16.44.1/24",
|
|
"10.0.42.1/24",
|
|
"10.0.43.1/24",
|
|
"192.168.42.1/24",
|
|
"192.168.43.1/24",
|
|
"192.168.44.1/24",
|
|
} {
|
|
ip, net, err := net.ParseCIDR(addr)
|
|
if err != nil {
|
|
log.Errorf("Failed to parse address %s", addr)
|
|
continue
|
|
}
|
|
net.IP = ip
|
|
bridgeNetworks = append(bridgeNetworks, net)
|
|
}
|
|
}
|
|
|
|
func SetupBridgeIPv4(i *Interface) error {
|
|
bridgeIPv4, err := electBridgeIPv4(i.Config)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
log.Debugf("Creating bridge interface %q with network %s", i.Config.BridgeName, bridgeIPv4)
|
|
return netlink.AddrAdd(i.Link, &netlink.Addr{bridgeIPv4, ""})
|
|
}
|
|
|
|
func electBridgeIPv4(config *Configuration) (*net.IPNet, error) {
|
|
// Use the requested IPv4 IP and mark when available.
|
|
if config.AddressIPv4 != nil {
|
|
return config.AddressIPv4, nil
|
|
}
|
|
|
|
// Try to automatically elect appropriate brige IPv4 settings.
|
|
for _, n := range bridgeNetworks {
|
|
// TODO CheckNameserverOverlaps
|
|
// TODO CheckRouteOverlaps
|
|
return n, nil
|
|
}
|
|
|
|
return nil, fmt.Errorf("Couldn't find an address range for interface %q", config.BridgeName)
|
|
}
|