64 lines
1.9 KiB
Go
64 lines
1.9 KiB
Go
package routing
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import (
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"errors"
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"fmt"
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"net"
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)
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var (
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ErrAddOutboundSubnet = errors.New("cannot add outbound subnet to routes")
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)
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type OutboundRoutesSetter interface {
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SetOutboundRoutes(outboundSubnets []net.IPNet) error
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}
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func (r *routing) SetOutboundRoutes(outboundSubnets []net.IPNet) error {
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defaultInterface, defaultGateway, err := r.DefaultRoute()
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if err != nil {
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return err
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}
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return r.setOutboundRoutes(outboundSubnets, defaultInterface, defaultGateway)
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}
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func (r *routing) setOutboundRoutes(outboundSubnets []net.IPNet,
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defaultInterfaceName string, defaultGateway net.IP) error {
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r.stateMutex.Lock()
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defer r.stateMutex.Unlock()
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subnetsToRemove := findSubnetsToRemove(r.outboundSubnets, outboundSubnets)
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subnetsToAdd := findSubnetsToAdd(r.outboundSubnets, outboundSubnets)
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if len(subnetsToAdd) == 0 && len(subnetsToRemove) == 0 {
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return nil
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}
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r.removeOutboundSubnets(subnetsToRemove, defaultInterfaceName, defaultGateway)
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return r.addOutboundSubnets(subnetsToAdd, defaultInterfaceName, defaultGateway)
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}
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func (r *routing) removeOutboundSubnets(subnets []net.IPNet,
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defaultInterfaceName string, defaultGateway net.IP) {
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for _, subnet := range subnets {
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const table = 0
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if err := r.deleteRouteVia(subnet, defaultGateway, defaultInterfaceName, table); err != nil {
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r.logger.Error("cannot remove outdated outbound subnet from routing: " + err.Error())
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continue
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}
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r.outboundSubnets = removeSubnetFromSubnets(r.outboundSubnets, subnet)
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}
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}
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func (r *routing) addOutboundSubnets(subnets []net.IPNet,
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defaultInterfaceName string, defaultGateway net.IP) error {
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for _, subnet := range subnets {
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const table = 0
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if err := r.addRouteVia(subnet, defaultGateway, defaultInterfaceName, table); err != nil {
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return fmt.Errorf("%w: %s: %s", ErrAddOutboundSubnet, subnet, err)
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}
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r.outboundSubnets = append(r.outboundSubnets, subnet)
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}
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return nil
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}
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