Fix/acl for forward (#1305)

Fix ACL on routed traffic and code refactor

client/firewall/nftables/ipsetstore_linux.go

@@ -0,0 +1,85 @@
+package nftables
+
+import (
+	"net"
+)
+
+type ipsetStore struct {
+	ipsetReference map[string]int
+	ipsets         map[string]map[string]struct{} // ipsetName -> list of ips
+}
+
+func newIpsetStore() *ipsetStore {
+	return &ipsetStore{
+		ipsetReference: make(map[string]int),
+		ipsets:         make(map[string]map[string]struct{}),
+	}
+}
+
+func (s *ipsetStore) ips(ipsetName string) (map[string]struct{}, bool) {
+	r, ok := s.ipsets[ipsetName]
+	return r, ok
+}
+
+func (s *ipsetStore) newIpset(ipsetName string) map[string]struct{} {
+	s.ipsetReference[ipsetName] = 0
+	ipList := make(map[string]struct{})
+	s.ipsets[ipsetName] = ipList
+	return ipList
+}
+
+func (s *ipsetStore) deleteIpset(ipsetName string) {
+	delete(s.ipsetReference, ipsetName)
+	delete(s.ipsets, ipsetName)
+}
+
+func (s *ipsetStore) DeleteIpFromSet(ipsetName string, ip net.IP) {
+	ipList, ok := s.ipsets[ipsetName]
+	if !ok {
+		return
+	}
+	delete(ipList, ip.String())
+}
+
+func (s *ipsetStore) AddIpToSet(ipsetName string, ip net.IP) {
+	ipList, ok := s.ipsets[ipsetName]
+	if !ok {
+		return
+	}
+	ipList[ip.String()] = struct{}{}
+}
+
+func (s *ipsetStore) IsIpInSet(ipsetName string, ip net.IP) bool {
+	ipList, ok := s.ipsets[ipsetName]
+	if !ok {
+		return false
+	}
+	_, ok = ipList[ip.String()]
+	return ok
+}
+
+func (s *ipsetStore) AddReferenceToIpset(ipsetName string) {
+	s.ipsetReference[ipsetName]++
+}
+
+func (s *ipsetStore) DeleteReferenceFromIpSet(ipsetName string) {
+	r, ok := s.ipsetReference[ipsetName]
+	if !ok {
+		return
+	}
+	if r == 0 {
+		return
+	}
+	s.ipsetReference[ipsetName]--
+}
+
+func (s *ipsetStore) HasReferenceToSet(ipsetName string) bool {
+	if _, ok := s.ipsetReference[ipsetName]; !ok {
+		return false
+	}
+	if s.ipsetReference[ipsetName] == 0 {
+		return false
+	}
+
+	return true
+}