github.com/rawahars/moby@v24.0.4+incompatible/libnetwork/drivers/overlay/overlayutils/utils.go (about)

     1  // Package overlayutils provides utility functions for overlay networks
     2  package overlayutils
     3  
     4  import (
     5  	"fmt"
     6  	"sync"
     7  )
     8  
     9  var (
    10  	mutex        sync.RWMutex
    11  	vxlanUDPPort = defaultVXLANUDPPort
    12  )
    13  
    14  const defaultVXLANUDPPort uint32 = 4789
    15  
    16  // ConfigVXLANUDPPort configures the VXLAN UDP port (data path port) number.
    17  // If no port is set, the default (4789) is returned. Valid port numbers are
    18  // between 1024 and 49151.
    19  func ConfigVXLANUDPPort(vxlanPort uint32) error {
    20  	if vxlanPort == 0 {
    21  		vxlanPort = defaultVXLANUDPPort
    22  	}
    23  	// IANA procedures for each range in detail
    24  	// The Well Known Ports, aka the System Ports, from 0-1023
    25  	// The Registered Ports, aka the User Ports, from 1024-49151
    26  	// The Dynamic Ports, aka the Private Ports, from 49152-65535
    27  	// So we can allow range between 1024 to 49151
    28  	if vxlanPort < 1024 || vxlanPort > 49151 {
    29  		return fmt.Errorf("VXLAN UDP port number is not in valid range (1024-49151): %d", vxlanPort)
    30  	}
    31  	mutex.Lock()
    32  	vxlanUDPPort = vxlanPort
    33  	mutex.Unlock()
    34  	return nil
    35  }
    36  
    37  // VXLANUDPPort returns Vxlan UDP port number
    38  func VXLANUDPPort() uint32 {
    39  	mutex.RLock()
    40  	defer mutex.RUnlock()
    41  	return vxlanUDPPort
    42  }