dca23ad451
Calling AddPort before AddProtocol returns an error, which means ConntrackDeleteFilter has been called without port filter. Signed-off-by: Sang Heon Lee <developistBV@gmail.com>
74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
// Copyright 2020 CNI authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package utils
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
|
|
"github.com/vishvananda/netlink"
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
// Assigned Internet Protocol Numbers
|
|
// https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml
|
|
const (
|
|
PROTOCOL_TCP = 6
|
|
PROTOCOL_UDP = 17
|
|
PROTOCOL_SCTP = 132
|
|
)
|
|
|
|
// getNetlinkFamily returns the Netlink IP family constant
|
|
func getNetlinkFamily(isIPv6 bool) netlink.InetFamily {
|
|
if isIPv6 {
|
|
return unix.AF_INET6
|
|
}
|
|
return unix.AF_INET
|
|
}
|
|
|
|
// DeleteConntrackEntriesForDstIP delete the conntrack entries for the connections
|
|
// specified by the given destination IP and protocol
|
|
func DeleteConntrackEntriesForDstIP(dstIP string, protocol uint8) error {
|
|
ip := net.ParseIP(dstIP)
|
|
if ip == nil {
|
|
return fmt.Errorf("error deleting connection tracking state, bad IP %s", ip)
|
|
}
|
|
family := getNetlinkFamily(ip.To4() == nil)
|
|
|
|
filter := &netlink.ConntrackFilter{}
|
|
filter.AddIP(netlink.ConntrackOrigDstIP, ip)
|
|
filter.AddProtocol(protocol)
|
|
|
|
_, err := netlink.ConntrackDeleteFilter(netlink.ConntrackTable, family, filter)
|
|
if err != nil {
|
|
return fmt.Errorf("error deleting connection tracking state for protocol: %d IP: %s, error: %v", protocol, ip, err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// DeleteConntrackEntriesForDstPort delete the conntrack entries for the connections specified
|
|
// by the given destination port, protocol and IP family
|
|
func DeleteConntrackEntriesForDstPort(port uint16, protocol uint8, family netlink.InetFamily) error {
|
|
filter := &netlink.ConntrackFilter{}
|
|
filter.AddProtocol(protocol)
|
|
filter.AddPort(netlink.ConntrackOrigDstPort, port)
|
|
|
|
_, err := netlink.ConntrackDeleteFilter(netlink.ConntrackTable, family, filter)
|
|
if err != nil {
|
|
return fmt.Errorf("error deleting connection tracking state for protocol: %d Port: %d, error: %v", protocol, port, err)
|
|
}
|
|
return nil
|
|
}
|