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package util
import (
"fmt"
"net"
"slices"
"github.com/containers/common/libnetwork/types"
"github.com/containers/common/libnetwork/util"
"github.com/containers/common/pkg/config"
)
func CreateBridge(n NetUtil, network *types.Network, usedNetworks []*net.IPNet, subnetPools []config.SubnetPool, checkBridgeConflict bool) error {
if network.NetworkInterface != "" {
if checkBridgeConflict {
bridges := GetBridgeInterfaceNames(n)
if slices.Contains(bridges, network.NetworkInterface) {
return fmt.Errorf("bridge name %s already in use", network.NetworkInterface)
}
}
if !types.NameRegex.MatchString(network.NetworkInterface) {
return fmt.Errorf("bridge name %s invalid: %w", network.NetworkInterface, types.ErrInvalidName)
}
} else {
var err error
network.NetworkInterface, err = GetFreeDeviceName(n)
if err != nil {
return err
}
}
ipamDriver := network.IPAMOptions[types.Driver]
// also do this when the driver is unset
if ipamDriver == "" || ipamDriver == types.HostLocalIPAMDriver {
if len(network.Subnets) == 0 {
freeSubnet, err := GetFreeIPv4NetworkSubnet(usedNetworks, subnetPools)
if err != nil {
return err
}
network.Subnets = append(network.Subnets, *freeSubnet)
}
// ipv6 enabled means dual stack, check if we already have
// a ipv4 or ipv6 subnet and add one if not.
if network.IPv6Enabled {
ipv4 := false
ipv6 := false
for _, subnet := range network.Subnets {
if util.IsIPv6(subnet.Subnet.IP) {
ipv6 = true
}
if util.IsIPv4(subnet.Subnet.IP) {
ipv4 = true
}
}
if !ipv4 {
freeSubnet, err := GetFreeIPv4NetworkSubnet(usedNetworks, subnetPools)
if err != nil {
return err
}
network.Subnets = append(network.Subnets, *freeSubnet)
}
if !ipv6 {
freeSubnet, err := GetFreeIPv6NetworkSubnet(usedNetworks)
if err != nil {
return err
}
network.Subnets = append(network.Subnets, *freeSubnet)
}
}
network.IPAMOptions[types.Driver] = types.HostLocalIPAMDriver
}
return nil
}
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