ea2d686468
There's nothing handling these results, and they're logged as debug-logs, so we may as well remove the returned variables. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
107 lines
3.6 KiB
Go
107 lines
3.6 KiB
Go
//go:build linux
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// +build linux
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package iptables
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import (
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"context"
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"errors"
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"net"
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"syscall"
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"github.com/containerd/containerd/log"
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"github.com/docker/docker/libnetwork/types"
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"github.com/vishvananda/netlink"
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)
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// checkConntrackProgrammable checks if the handle supports the
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// NETLINK_NETFILTER and the base modules are loaded.
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func checkConntrackProgrammable(nlh *netlink.Handle) error {
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if !nlh.SupportsNetlinkFamily(syscall.NETLINK_NETFILTER) {
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return errors.New("conntrack is not available")
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}
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return nil
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}
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// DeleteConntrackEntries deletes all the conntrack connections on the host for the specified IP
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// Returns the number of flows deleted for IPv4, IPv6 else error
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func DeleteConntrackEntries(nlh *netlink.Handle, ipv4List []net.IP, ipv6List []net.IP) error {
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if err := checkConntrackProgrammable(nlh); err != nil {
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return err
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}
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var totalIPv4FlowPurged uint
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for _, ipAddress := range ipv4List {
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flowPurged, err := purgeConntrackState(nlh, syscall.AF_INET, ipAddress)
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if err != nil {
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log.G(context.TODO()).Warnf("Failed to delete conntrack state for %s: %v", ipAddress, err)
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continue
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}
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totalIPv4FlowPurged += flowPurged
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}
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var totalIPv6FlowPurged uint
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for _, ipAddress := range ipv6List {
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flowPurged, err := purgeConntrackState(nlh, syscall.AF_INET6, ipAddress)
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if err != nil {
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log.G(context.TODO()).Warnf("Failed to delete conntrack state for %s: %v", ipAddress, err)
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continue
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}
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totalIPv6FlowPurged += flowPurged
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}
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if totalIPv4FlowPurged > 0 || totalIPv6FlowPurged > 0 {
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log.G(context.TODO()).Debugf("DeleteConntrackEntries purged ipv4:%d, ipv6:%d", totalIPv4FlowPurged, totalIPv6FlowPurged)
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}
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return nil
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}
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func DeleteConntrackEntriesByPort(nlh *netlink.Handle, proto types.Protocol, ports []uint16) error {
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if err := checkConntrackProgrammable(nlh); err != nil {
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return err
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}
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var totalIPv4FlowPurged uint
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var totalIPv6FlowPurged uint
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for _, port := range ports {
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filter := &netlink.ConntrackFilter{}
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if err := filter.AddProtocol(uint8(proto)); err != nil {
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log.G(context.TODO()).Warnf("Failed to delete conntrack state for %s port %d: %v", proto.String(), port, err)
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continue
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}
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if err := filter.AddPort(netlink.ConntrackOrigDstPort, port); err != nil {
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log.G(context.TODO()).Warnf("Failed to delete conntrack state for %s port %d: %v", proto.String(), port, err)
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continue
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}
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v4FlowPurged, err := nlh.ConntrackDeleteFilter(netlink.ConntrackTable, syscall.AF_INET, filter)
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if err != nil {
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log.G(context.TODO()).Warnf("Failed to delete conntrack state for IPv4 %s port %d: %v", proto.String(), port, err)
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}
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totalIPv4FlowPurged += v4FlowPurged
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v6FlowPurged, err := nlh.ConntrackDeleteFilter(netlink.ConntrackTable, syscall.AF_INET6, filter)
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if err != nil {
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log.G(context.TODO()).Warnf("Failed to delete conntrack state for IPv6 %s port %d: %v", proto.String(), port, err)
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}
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totalIPv6FlowPurged += v6FlowPurged
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}
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if totalIPv4FlowPurged > 0 || totalIPv6FlowPurged > 0 {
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log.G(context.TODO()).Debugf("DeleteConntrackEntriesByPort for %s ports purged ipv4:%d, ipv6:%d", proto.String(), totalIPv4FlowPurged, totalIPv6FlowPurged)
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}
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return nil
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}
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func purgeConntrackState(nlh *netlink.Handle, family netlink.InetFamily, ipAddress net.IP) (uint, error) {
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filter := &netlink.ConntrackFilter{}
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// NOTE: doing the flush using the ipAddress is safe because today there cannot be multiple networks with the same subnet
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// so it will not be possible to flush flows that are of other containers
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if err := filter.AddIP(netlink.ConntrackNatAnyIP, ipAddress); err != nil {
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return 0, err
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}
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return nlh.ConntrackDeleteFilter(netlink.ConntrackTable, family, filter)
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}
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