64 lines
2.2 KiB
Go
64 lines
2.2 KiB
Go
//go:build linux
|
|
// +build linux
|
|
|
|
package iptables
|
|
|
|
import (
|
|
"errors"
|
|
"net"
|
|
"syscall"
|
|
|
|
"github.com/sirupsen/logrus"
|
|
"github.com/vishvananda/netlink"
|
|
)
|
|
|
|
var (
|
|
// ErrConntrackNotConfigurable means that conntrack module is not loaded or does not have the netlink module loaded
|
|
ErrConntrackNotConfigurable = errors.New("conntrack is not available")
|
|
)
|
|
|
|
// IsConntrackProgrammable returns true if the handle supports the NETLINK_NETFILTER and the base modules are loaded
|
|
func IsConntrackProgrammable(nlh *netlink.Handle) bool {
|
|
return nlh.SupportsNetlinkFamily(syscall.NETLINK_NETFILTER)
|
|
}
|
|
|
|
// DeleteConntrackEntries deletes all the conntrack connections on the host for the specified IP
|
|
// Returns the number of flows deleted for IPv4, IPv6 else error
|
|
func DeleteConntrackEntries(nlh *netlink.Handle, ipv4List []net.IP, ipv6List []net.IP) (uint, uint, error) {
|
|
if !IsConntrackProgrammable(nlh) {
|
|
return 0, 0, ErrConntrackNotConfigurable
|
|
}
|
|
|
|
var totalIPv4FlowPurged uint
|
|
for _, ipAddress := range ipv4List {
|
|
flowPurged, err := purgeConntrackState(nlh, syscall.AF_INET, ipAddress)
|
|
if err != nil {
|
|
logrus.Warnf("Failed to delete conntrack state for %s: %v", ipAddress, err)
|
|
continue
|
|
}
|
|
totalIPv4FlowPurged += flowPurged
|
|
}
|
|
|
|
var totalIPv6FlowPurged uint
|
|
for _, ipAddress := range ipv6List {
|
|
flowPurged, err := purgeConntrackState(nlh, syscall.AF_INET6, ipAddress)
|
|
if err != nil {
|
|
logrus.Warnf("Failed to delete conntrack state for %s: %v", ipAddress, err)
|
|
continue
|
|
}
|
|
totalIPv6FlowPurged += flowPurged
|
|
}
|
|
|
|
logrus.Debugf("DeleteConntrackEntries purged ipv4:%d, ipv6:%d", totalIPv4FlowPurged, totalIPv6FlowPurged)
|
|
return totalIPv4FlowPurged, totalIPv6FlowPurged, nil
|
|
}
|
|
|
|
func purgeConntrackState(nlh *netlink.Handle, family netlink.InetFamily, ipAddress net.IP) (uint, error) {
|
|
filter := &netlink.ConntrackFilter{}
|
|
// NOTE: doing the flush using the ipAddress is safe because today there cannot be multiple networks with the same subnet
|
|
// so it will not be possible to flush flows that are of other containers
|
|
if err := filter.AddIP(netlink.ConntrackNatAnyIP, ipAddress); err != nil {
|
|
return 0, err
|
|
}
|
|
return nlh.ConntrackDeleteFilter(netlink.ConntrackTable, family, filter)
|
|
}
|