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mapper_linux.go
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/
mapper_linux.go
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package portmapper
import (
"net"
"sync"
"github.com/docker/docker/libnetwork/iptables"
"github.com/docker/docker/libnetwork/portallocator"
)
// PortMapper manages the network address translation
type PortMapper struct {
bridgeName string
// udp:ip:port
currentMappings map[string]*mapping
lock sync.Mutex
proxyPath string
allocator *portallocator.PortAllocator
chain *iptables.ChainInfo
}
// SetIptablesChain sets the specified chain into portmapper
func (pm *PortMapper) SetIptablesChain(c *iptables.ChainInfo, bridgeName string) {
pm.chain = c
pm.bridgeName = bridgeName
}
// AppendForwardingTableEntry adds a port mapping to the forwarding table
func (pm *PortMapper) AppendForwardingTableEntry(proto string, sourceIP net.IP, sourcePort int, containerIP string, containerPort int) error {
return pm.forward(iptables.Append, proto, sourceIP, sourcePort, containerIP, containerPort)
}
// DeleteForwardingTableEntry removes a port mapping from the forwarding table
func (pm *PortMapper) DeleteForwardingTableEntry(proto string, sourceIP net.IP, sourcePort int, containerIP string, containerPort int) error {
return pm.forward(iptables.Delete, proto, sourceIP, sourcePort, containerIP, containerPort)
}
func (pm *PortMapper) forward(action iptables.Action, proto string, sourceIP net.IP, sourcePort int, containerIP string, containerPort int) error {
if pm.chain == nil {
return nil
}
return pm.chain.Forward(action, sourceIP, sourcePort, proto, containerIP, containerPort, pm.bridgeName)
}