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ipsetmanager.go
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ipsetmanager.go
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package ipsetmanager
import (
"encoding/base64"
"fmt"
"io"
"net"
"strings"
"sync"
ipsetpackage "github.com/aporeto-inc/go-ipset/ipset"
"github.com/spaolacci/murmur3"
"go.aporeto.io/enforcerd/trireme-lib/controller/constants"
"go.aporeto.io/enforcerd/trireme-lib/policy"
"go.uber.org/zap"
)
const (
//IPv6DefaultIP is the default ip of v6
IPv6DefaultIP = "::/0"
//IPv4DefaultIP is the default ip for v4
IPv4DefaultIP = "0.0.0.0/0"
//IPsetV4 version for ipv4
IPsetV4 = iota
//IPsetV6 version for ipv6
IPsetV6
processPortSetPrefix = "ProcPort-"
proxyPortSetPrefix = "Proxy-"
targetTCPSuffix = "TargetTCP"
targetUDPSuffix = "TargetUDP"
excludedSuffix = "Excluded"
)
//TargetAndExcludedNetworks interface is used to interact with target and excluded networks
type TargetAndExcludedNetworks interface {
//CreateIPsetsForTargetAndExcludedNetworks creates the ipsets for target and excluded networks
CreateIPsetsForTargetAndExcludedNetworks() error
//UpdateIPsetsForTargetAndExcludedNetworks updates the ipsets accordingly.
UpdateIPsetsForTargetAndExcludedNetworks([]string, []string, []string) error
//GetIPsetNamesForTargetAndExcludedNetworks returns the ipsets names for tcp, udp and excluded networks
GetIPsetNamesForTargetAndExcludedNetworks() (string, string, string)
}
//ServerL3 interface is used to interact with the ipsets required to program
//ports that the server(PU) listens on in L3 datapath.
type ServerL3 interface {
//CreateServerPortSet creates the ipset.
CreateServerPortSet(contextID string) error
//GetServerPortSetName returns the name of the portset created
GetServerPortSetName(contextID string) string
//DestroyServerPortSet destroys the server port set.
DestroyServerPortSet(contextID string) error
//AddPortToServerPortSet adds port to the portset.
AddPortToServerPortSet(contextID string, port string) error
//DeletePortFromServerPortSet deletes the port from port set.
DeletePortFromServerPortSet(contextID string, port string) error
}
// ACLL3 interface is used to interact with the ipsets required for
// application and network acl's in L3.
type ACLL3 interface {
//RegisterExternalNets registers the ipsets corresponding the external networks.
RegisterExternalNets(contextID string, extnets policy.IPRuleList) error
//AddACLIPsets adds the IPs in the ipsets corresponding to the external network service ID.
UpdateACLIPsets([]string, string)
//DestroyUnusedIPsets will remove the unused ipsets.
DestroyUnusedIPsets()
//RemoveExternalNets removes the external networks corresponding to the PU contextID.
RemoveExternalNets(contextID string)
//GetACLIPsets returns the ipset string that correspond to the external networks in the argument
GetACLIPsetsNames(extnets policy.IPRuleList) []string
// DeleteEntryFromIPset delete an entry from an ipset
DeleteEntryFromIPset(ips []string, serviceID string)
}
//ProxyL4 interface is used to interact with the ipsets required for
//L4/L7 Services. These include dependent services and exposed Services
type ProxyL4 interface {
//CreateProxySets creates the ipsets to implement L4/L7 services
CreateProxySets(contextID string) error
//GetProxyIPsetNames returns the ipset strings that correspond to the pu
GetProxySetNames(contextID string) (string, string)
//DestroyProxySet destroys the ipsets being used for L4/L7 services
DestroyProxySets(contextID string)
//FlushProxySets flushes the proxy IPsets
FlushProxySets(contextID string)
//AddIPPortToDependentService adds ip port to the dependent service
AddIPPortToDependentService(contextID string, ip *net.IPNet, port string) error
//AddPortToExposedService adds the port that this service is exposing
AddPortToExposedService(contextID string, port string) error
}
//DestroyAll destroys all the ipsets created.
type DestroyAll interface {
//DestroyAllIPsets destroys the created ipsets.
DestroyAllIPsets() error
}
//IPsetPrefix returns the prefix used to construct the ipset.
type IPsetPrefix interface {
//GetIPsetPrefix returns the prefix.
GetIPsetPrefix() string
}
//IPSetManager interface is used by supervisor. This interface provides the supervisor to
//create ipsets corresponding to service ID.
type IPSetManager interface {
TargetAndExcludedNetworks
ServerL3
ACLL3
ProxyL4
DestroyAll
IPsetPrefix
Reset()
}
type ipsetInfo struct {
contextIDs map[string]bool
name string
addresses map[string]bool
}
type aclHandler struct {
serviceIDtoACLIPset map[string]*ipsetInfo
contextIDtoServiceIDs map[string]map[string]bool
toDestroy []string
}
type targetNetwork struct {
tcp []string
udp []string
}
type excludedNetwork struct {
excluded []string
}
type handler struct {
sync.RWMutex
ipsetPrefix string
ipFilter func(net.IP) bool
ipsetParams *ipsetpackage.Params
acl aclHandler
tn targetNetwork
en excludedNetwork
dynamicUpdates map[string][]string
}
const (
ipv4String = "v4-"
ipv6String = "v6-"
)
var ipv4Handler = &handler{
ipsetPrefix: constants.ChainPrefix + ipv4String,
ipFilter: func(ip net.IP) bool {
return (ip.To4() != nil)
},
ipsetParams: &ipsetpackage.Params{},
acl: aclHandler{
serviceIDtoACLIPset: map[string]*ipsetInfo{},
contextIDtoServiceIDs: map[string]map[string]bool{},
},
tn: targetNetwork{tcp: []string{}, udp: []string{}},
en: excludedNetwork{excluded: []string{}},
dynamicUpdates: map[string][]string{},
}
var ipv6Handler = &handler{
ipsetPrefix: constants.ChainPrefix + ipv6String,
ipFilter: func(ip net.IP) bool {
return (ip.To4() == nil)
},
ipsetParams: &ipsetpackage.Params{HashFamily: "inet6"},
acl: aclHandler{
serviceIDtoACLIPset: map[string]*ipsetInfo{},
contextIDtoServiceIDs: map[string]map[string]bool{},
},
tn: targetNetwork{tcp: []string{}, udp: []string{}},
en: excludedNetwork{excluded: []string{}},
dynamicUpdates: map[string][]string{},
}
//V4 returns the ipv4 instance of ipsetmanager
func V4() IPSetManager {
return ipv4Handler
}
//V6 returns the ipv6 instance of ipsetmanager
func V6() IPSetManager {
return ipv6Handler
}
func (ipHandler *handler) DestroyAllIPsets() error {
if err := destroyAll(ipHandler.ipsetPrefix); err != nil {
return err
}
return nil
}
func (ipHandler *handler) Reset() {
ipHandler.Lock()
ipHandler.acl = aclHandler{
serviceIDtoACLIPset: map[string]*ipsetInfo{},
contextIDtoServiceIDs: map[string]map[string]bool{},
}
ipHandler.tn = targetNetwork{tcp: []string{}, udp: []string{}}
ipHandler.en = excludedNetwork{excluded: []string{}}
ipHandler.Unlock()
}
func (ipHandler *handler) CreateIPsetsForTargetAndExcludedNetworks() error {
targetTCPName := ipHandler.ipsetPrefix + targetTCPSuffix
targetUDPName := ipHandler.ipsetPrefix + targetUDPSuffix
excludedName := ipHandler.ipsetPrefix + excludedSuffix
existingSets, err := listIPSets()
if err != nil {
return fmt.Errorf("unable to read current sets: %s", err)
}
setIndex := map[string]struct{}{}
for _, s := range existingSets {
setIndex[s] = struct{}{}
}
createIPSet := func(name string) error {
var ipset Ipset
var err error
if _, ok := setIndex[name]; !ok {
ipset, err = newIpset(name, "hash:net", ipHandler.ipsetParams)
if err != nil {
return err
}
} else {
ipset = getIpset(name)
}
if err = ipset.Flush(); err != nil {
return err
}
return nil
}
if err := createIPSet(targetTCPName); err != nil {
return err
}
if err := createIPSet(targetUDPName); err != nil {
return err
}
if err := createIPSet(excludedName); err != nil {
return err
}
return nil
}
func updateIPSets(ipset Ipset, old []string, new []string) error {
// We need to delete first, because of nomatch.
// For example, if old has 1.2.3.4 and new has !1.2.3.4, then we delete the 1.2.3.4 first
// before we can add the 1.2.3.4 with the nomatch option.
deleteMap := map[string]bool{}
addMap := map[string]bool{}
for _, net := range old {
deleteMap[net] = true
}
for _, net := range new {
if _, ok := deleteMap[net]; ok {
deleteMap[net] = false
continue
}
addMap[net] = true
}
for net, delete := range deleteMap {
if delete {
if err := delFromIPset(ipset, net); err != nil {
zap.L().Debug("unable to remove network from set", zap.Error(err))
}
}
}
for net, add := range addMap {
if add {
if err := addToIPset(ipset, net); err != nil {
return fmt.Errorf("unable to update target set: %s", err)
}
}
}
return nil
}
func (ipHandler *handler) UpdateIPsetsForTargetAndExcludedNetworks(tcp []string, udp []string, excluded []string) error {
filterIPs := func(ips []string) []string {
var filteredIPs []string
for _, ip := range ips {
parsable := ip
if strings.HasPrefix(ip, "!") {
parsable = ip[1:]
}
netIP := net.ParseIP(parsable)
if netIP == nil {
netIP, _, _ = net.ParseCIDR(parsable)
}
if ipHandler.ipFilter(netIP) {
filteredIPs = append(filteredIPs, ip)
}
}
return filteredIPs
}
tcpSet := getIpset(ipHandler.ipsetPrefix + targetTCPSuffix)
udpSet := getIpset(ipHandler.ipsetPrefix + targetUDPSuffix)
excludedSet := getIpset(ipHandler.ipsetPrefix + excludedSuffix)
tcpFilterIPs := filterIPs(tcp)
if err := updateIPSets(tcpSet, ipHandler.tn.tcp, tcpFilterIPs); err != nil {
return err
}
udpFilterIPs := filterIPs(udp)
if err := updateIPSets(udpSet, ipHandler.tn.udp, udpFilterIPs); err != nil {
return err
}
excludedFilterIPs := filterIPs(excluded)
if err := updateIPSets(excludedSet, ipHandler.en.excluded, excludedFilterIPs); err != nil {
return err
}
ipHandler.tn.tcp = tcpFilterIPs
ipHandler.tn.udp = udpFilterIPs
ipHandler.en.excluded = excludedFilterIPs
return nil
}
func (ipHandler *handler) GetIPsetNamesForTargetAndExcludedNetworks() (string, string, string) {
return ipHandler.ipsetPrefix + targetTCPSuffix, ipHandler.ipsetPrefix + targetUDPSuffix, ipHandler.ipsetPrefix + excludedSuffix
}
func (ipHandler *handler) getServerPortSetName(contextID string) string {
prefix := ipHandler.ipsetPrefix + processPortSetPrefix
return createName(contextID, prefix)
}
func (ipHandler *handler) getProxyIPSetNames(contextID string) (string, string) {
prefix := ipHandler.ipsetPrefix + proxyPortSetPrefix
name := createName(contextID, prefix)
return name + "-dst", name + "-srv"
}
func (ipHandler *handler) GetProxySetNames(contextID string) (string, string) {
return ipHandler.getProxyIPSetNames(contextID)
}
func (ipHandler *handler) DestroyProxySets(contextID string) {
destSetName, srvSetName := ipHandler.getProxyIPSetNames(contextID)
ips := getIpset(destSetName)
if err := ips.Destroy(); err != nil {
zap.L().Warn("Failed to destroy proxyPortSet", zap.String("SetName", destSetName), zap.Error(err))
}
ips = getIpset(srvSetName)
if err := ips.Destroy(); err != nil {
zap.L().Warn("Failed to clear proxy port set", zap.String("set name", srvSetName), zap.Error(err))
}
}
//CreateProxySets creates the ipsets for L4/L7 services
func (ipHandler *handler) CreateProxySets(contextID string) error {
destSetName, srvSetName := ipHandler.getProxyIPSetNames(contextID)
if _, err := newIpset(destSetName, "hash:net,port", ipHandler.ipsetParams); err != nil {
return fmt.Errorf("unable to create ipset for %s: %s", destSetName, err)
}
// create ipset for port match
if _, err := newIpset(srvSetName, proxySetPortIpsetType, nil); err != nil {
return fmt.Errorf("unable to create ipset for %s: %s", srvSetName, err)
}
return nil
}
func (ipHandler *handler) FlushProxySets(contextID string) {
destSetName, srvSetName := ipHandler.getProxyIPSetNames(contextID)
ips := getIpset(destSetName)
if err := ips.Flush(); err != nil {
zap.L().Warn("Failed to flush dest proxy port set", zap.String("SetName", destSetName), zap.Error(err))
}
ips = getIpset(srvSetName)
if err := ips.Flush(); err != nil {
zap.L().Warn("Failed to flush server proxy port set", zap.String("set name", srvSetName), zap.Error(err))
}
}
func (ipHandler *handler) AddIPPortToDependentService(contextID string, addr *net.IPNet, port string) error {
destSetName, _ := ipHandler.getProxyIPSetNames(contextID)
ips := getIpset(destSetName)
if ipHandler.ipFilter(addr.IP) {
pair := addr.String() + "," + port
if err := ips.Add(pair, 0); err != nil {
return fmt.Errorf("unable to add dependent ip %s to ipset: %s", pair, err)
}
}
return nil
}
func (ipHandler *handler) AddPortToExposedService(contextID string, port string) error {
_, srvSetName := ipHandler.getProxyIPSetNames(contextID)
ips := getIpset(srvSetName)
if err := ips.Add(port, 0); err != nil {
return fmt.Errorf("unable to add port %s to exposed service %s", port, err)
}
return nil
}
func (ipHandler *handler) GetServerPortSetName(contextID string) string {
return ipHandler.getServerPortSetName(contextID)
}
func (ipHandler *handler) CreateServerPortSet(contextID string) error {
if _, err := newIpset(ipHandler.getServerPortSetName(contextID), portSetIpsetType, nil); err != nil {
return err
}
return nil
}
func (ipHandler *handler) DestroyServerPortSet(contextID string) error {
portSetName := ipHandler.getServerPortSetName(contextID)
ips := getIpset(portSetName)
if err := ips.Destroy(); err != nil {
return fmt.Errorf("Failed to delete pu port set "+portSetName, zap.Error(err))
}
return nil
}
func (ipHandler *handler) AddPortToServerPortSet(contextID string, port string) error {
ips := getIpset(ipHandler.getServerPortSetName(contextID))
if err := ips.Add(port, 0); err != nil {
return fmt.Errorf("unable to add port to portset: %s", err)
}
return nil
}
func (ipHandler *handler) DeletePortFromServerPortSet(contextID string, port string) error {
ips := getIpset(ipHandler.getServerPortSetName(contextID))
if err := ips.Del(port); err != nil {
return fmt.Errorf("unable to delete port from portset: %s", err)
}
return nil
}
// RegisterExternalNets registers the contextID and the corresponding serviceIDs
func (ipHandler *handler) RegisterExternalNets(contextID string, extnets policy.IPRuleList) error {
ipHandler.Lock()
defer ipHandler.Unlock()
processExtnets := func() error {
for _, extnet := range extnets {
var ipset *ipsetInfo
serviceID := extnet.Policy.ServiceID
if ipset = ipHandler.acl.serviceIDtoACLIPset[serviceID]; ipset == nil {
var err error
if ipset, err = ipHandler.createACLIPset(serviceID); err != nil {
return err
}
}
// make sure to include updates that were added dynamically by the DNS proxy
addrs := extnet.Addresses
if dynamicAddrs, ok := ipHandler.dynamicUpdates[serviceID]; ok {
addrs = append(addrs, dynamicAddrs...)
}
ipHandler.synchronizeIPsinIpset(ipset, addrs)
// have a backreference from serviceID to contextID
ipset.contextIDs[contextID] = true
}
return nil
}
processOlderExtnets := func() {
newExtnets := map[string]bool{}
for _, extnet := range extnets {
serviceID := extnet.Policy.ServiceID
newExtnets[serviceID] = true
m, ok := ipHandler.acl.contextIDtoServiceIDs[contextID]
if ok && m[serviceID] {
delete(m, serviceID)
}
}
for serviceID := range ipHandler.acl.contextIDtoServiceIDs[contextID] {
ipHandler.reduceReferenceFromServiceID(contextID, serviceID)
}
ipHandler.acl.contextIDtoServiceIDs[contextID] = newExtnets
}
if err := processExtnets(); err != nil {
return err
}
processOlderExtnets()
return nil
}
// deleteDynamicAddresses must only be alled by DeleteEntryFromIPset to update the internal map of dyanamic addresses
func (ipHandler *handler) deleteDynamicAddresses(ips []string, serviceID string) {
if dynAddrs, ok := ipHandler.dynamicUpdates[serviceID]; ok {
ipMap := make(map[string]struct{}, len(ips))
for _, ip := range ips {
ipMap[ip] = struct{}{}
}
newAddrs := make([]string, 0, len(dynAddrs))
for _, dynAddr := range dynAddrs {
if _, ok := ipMap[dynAddr]; ok {
continue
}
newAddrs = append(newAddrs, dynAddr)
}
ipHandler.dynamicUpdates[serviceID] = newAddrs
}
}
// DeleteEntryFromIPset delete an entry from an ipset
func (ipHandler *handler) DeleteEntryFromIPset(ips []string, serviceID string) {
ipHandler.Lock()
defer ipHandler.Unlock()
ipHandler.deleteDynamicAddresses(ips, serviceID)
for _, address := range ips {
parsableAddress := address
if strings.HasPrefix(address, "!") {
parsableAddress = address[1:]
}
netIP := net.ParseIP(parsableAddress)
if netIP == nil {
netIP, _, _ = net.ParseCIDR(parsableAddress)
}
if ipset := ipHandler.acl.serviceIDtoACLIPset[serviceID]; ipset != nil {
ipsetHandler := getIpset(ipset.name)
delFromIPset(ipsetHandler, netIP.String()) // nolint
delete(ipset.addresses, address)
}
}
}
// updateDynamicAddresses must only be called by UpdateACLIPsets to update the internal map of dynamic addresses
func (ipHandler *handler) updateDynamicAddresses(addresses []string, serviceID string) {
// no need to lock, already done by the caller
if dynAddrs, ok := ipHandler.dynamicUpdates[serviceID]; ok {
ipMap := make(map[string]struct{}, len(dynAddrs))
for _, ip := range dynAddrs {
ipMap[ip] = struct{}{}
}
newAddrs := make([]string, 0, len(addresses))
for _, ip := range addresses {
if _, ok := ipMap[ip]; ok {
continue
}
newAddrs = append(newAddrs, ip)
}
ipHandler.dynamicUpdates[serviceID] = append(dynAddrs, newAddrs...)
} else {
ipHandler.dynamicUpdates[serviceID] = addresses
}
}
//UpdateACLIPsets updates the ip addresses in the ipsets corresponding to the serviceID
func (ipHandler *handler) UpdateACLIPsets(addresses []string, serviceID string) {
ipHandler.Lock()
defer ipHandler.Unlock()
ipHandler.updateDynamicAddresses(addresses, serviceID)
for _, address := range addresses {
parsableAddress := address
if strings.HasPrefix(address, "!") {
parsableAddress = address[1:]
}
netIP := net.ParseIP(parsableAddress)
if netIP == nil {
netIP, _, _ = net.ParseCIDR(parsableAddress)
}
if !ipHandler.ipFilter(netIP) {
continue
}
if ipset := ipHandler.acl.serviceIDtoACLIPset[serviceID]; ipset != nil {
ipsetHandler := getIpset(ipset.name)
if err := addToIPset(ipsetHandler, address); err != nil {
zap.L().Error("Error adding IPs to ipset", zap.String("ipset", ipset.name), zap.String("address", address))
}
ipset.addresses[address] = true
}
}
}
func hashServiceID(serviceID string) string {
hash := murmur3.New64()
if _, err := io.WriteString(hash, serviceID); err != nil {
return ""
}
return base64.URLEncoding.EncodeToString(hash.Sum(nil))
}
func (ipHandler *handler) synchronizeIPsinIpset(ipsetInfo *ipsetInfo, addresses []string) {
newips := map[string]bool{}
ipsetHandler := getIpset(ipsetInfo.name)
var addrToAdd, addrToDelete []string
for _, address := range addresses {
parsableAddress := address
if strings.HasPrefix(address, "!") {
parsableAddress = address[1:]
}
netIP := net.ParseIP(parsableAddress)
if netIP == nil {
netIP, _, _ = net.ParseCIDR(parsableAddress)
}
if !ipHandler.ipFilter(netIP) {
continue
}
newips[address] = true
if _, ok := ipsetInfo.addresses[address]; !ok {
addrToAdd = append(addrToAdd, address)
}
delete(ipsetInfo.addresses, address)
}
for address, val := range ipsetInfo.addresses {
if val {
addrToDelete = append(addrToDelete, address)
}
}
if err := updateIPSets(ipsetHandler, addrToDelete, addrToAdd); err != nil {
zap.L().Error("Error updating ipset during sync", zap.Error(err))
}
ipsetInfo.addresses = newips
}
func (ipHandler *handler) createACLIPset(serviceID string) (*ipsetInfo, error) {
ipsetName := ipHandler.ipsetPrefix + "ext-" + hashServiceID(serviceID)
if _, err := newIpset(ipsetName, "hash:net", ipHandler.ipsetParams); err != nil {
return nil, err
}
ipset := &ipsetInfo{contextIDs: map[string]bool{}, name: ipsetName, addresses: map[string]bool{}}
ipHandler.acl.serviceIDtoACLIPset[serviceID] = ipset
return ipset, nil
}
func (ipHandler *handler) deleteServiceID(serviceID string) {
ipsetInfo := ipHandler.acl.serviceIDtoACLIPset[serviceID]
ipHandler.acl.toDestroy = append(ipHandler.acl.toDestroy, ipsetInfo.name)
delete(ipHandler.acl.serviceIDtoACLIPset, serviceID)
}
//reduceReferenceFromServiceID reduces the reference for the serviceID.
func (ipHandler *handler) reduceReferenceFromServiceID(contextID string, serviceID string) {
var ipset *ipsetInfo
if ipset = ipHandler.acl.serviceIDtoACLIPset[serviceID]; ipset == nil {
zap.L().Error("Could not find ipset corresponding to serviceID", zap.String("serviceID", serviceID))
return
}
delete(ipset.contextIDs, contextID)
// there are no references from any pu. safe to destroy now
if len(ipset.contextIDs) == 0 {
ipHandler.deleteServiceID(serviceID)
}
}
// DestroyUnusedIPsets destroys the unused ipsets.
func (ipHandler *handler) DestroyUnusedIPsets() {
ipHandler.Lock()
defer ipHandler.Unlock()
for _, ipsetName := range ipHandler.acl.toDestroy {
ipsetHandler := getIpset(ipsetName)
if err := ipsetHandler.Destroy(); err != nil {
zap.L().Warn("Failed to destroy ipset", zap.String("ipset", ipsetName), zap.Error(err))
}
}
ipHandler.acl.toDestroy = nil
}
// RemoveExternalNets is called when the contextID is being unsupervised such that all the external nets can be deleted.
func (ipHandler *handler) RemoveExternalNets(contextID string) {
ipHandler.Lock()
m, ok := ipHandler.acl.contextIDtoServiceIDs[contextID]
if ok {
for serviceID := range m {
ipHandler.reduceReferenceFromServiceID(contextID, serviceID)
}
}
delete(ipHandler.acl.contextIDtoServiceIDs, contextID)
ipHandler.Unlock()
ipHandler.DestroyUnusedIPsets()
}
func (ipHandler *handler) GetIPsetPrefix() string {
return ipHandler.ipsetPrefix
}
// GetACLIPsets returns the ipset names corresponding to the serviceIDs.
func (ipHandler *handler) GetACLIPsetsNames(extnets policy.IPRuleList) []string {
ipHandler.Lock()
defer ipHandler.Unlock()
var ipsets []string
for _, extnet := range extnets {
serviceID := extnet.Policy.ServiceID
ipsetInfo, ok := ipHandler.acl.serviceIDtoACLIPset[serviceID]
if ok {
ipsets = append(ipsets, ipsetInfo.name)
}
}
return ipsets
}
//createName takes the contextID and prefix and returns a name after processing
func createName(contextID string, prefix string) string {
hash := murmur3.New64()
if _, err := io.WriteString(hash, contextID); err != nil {
return ""
}
output := base64.URLEncoding.EncodeToString(hash.Sum(nil))
if len(contextID) > 4 {
contextID = contextID[:4] + output[:4]
} else {
contextID = contextID + output[:4]
}
if len(prefix) > 16 {
prefix = prefix[:16]
}
return (prefix + contextID)
}
//V4test returns the test handler for ipv4
func V4test() IPSetManager {
return &handler{
ipsetPrefix: "TRI-" + ipv4String,
ipFilter: func(ip net.IP) bool {
return (ip.To4() != nil)
},
ipsetParams: &ipsetpackage.Params{},
acl: aclHandler{
serviceIDtoACLIPset: map[string]*ipsetInfo{},
contextIDtoServiceIDs: map[string]map[string]bool{},
},
tn: targetNetwork{tcp: []string{}, udp: []string{}},
en: excludedNetwork{excluded: []string{}},
}
}
//V6test returns the test handler for ipv6
func V6test() IPSetManager {
return &handler{
ipsetPrefix: "TRI-" + ipv6String,
ipFilter: func(ip net.IP) bool {
return (ip.To4() == nil)
},
ipsetParams: &ipsetpackage.Params{HashFamily: "inet6"},
acl: aclHandler{
serviceIDtoACLIPset: map[string]*ipsetInfo{},
contextIDtoServiceIDs: map[string]map[string]bool{},
},
tn: targetNetwork{tcp: []string{}, udp: []string{}},
en: excludedNetwork{excluded: []string{}},
}
}