ITQC/containernetworking-plugins
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ns: add interface, use it, and fix thread-related namespace switch issues

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Add a namespace object interface for somewhat cleaner code when
creating and switching between network namespaces.  All created
namespaces are now mounted in /var/run/netns to ensure they
have persistent inodes and paths that can be passed around
between plugin components without relying on the current namespace
being correct.

Also remove the thread-locking arguments from the ns package
per https://github.com/appc/cni/issues/183 by doing all the namespace
changes in a separate goroutine that locks/unlocks itself, instead of
the caller having to track OS thread locking.
This commit is contained in:
Dan Williams
2016-04-05 11:10:31 -05:00
parent 3e1c3c60da
commit c0d34c692f
19 changed files with 373 additions and 460 deletions
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13
plugins/main/ipvlan/ipvlan.go
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@ -18,7 +18,6 @@ import (
"encoding/json"
"errors"
"fmt"
"os"
"runtime"
"github.com/containernetworking/cni/pkg/ip"
@ -65,7 +64,7 @@ func modeFromString(s string) (netlink.IPVlanMode, error) {
}
}
func createIpvlan(conf *NetConf, ifName string, netns *os.File) error {
func createIpvlan(conf *NetConf, ifName string, netns ns.NetNS) error {
mode, err := modeFromString(conf.Mode)
if err != nil {
return err
@ -97,7 +96,7 @@ func createIpvlan(conf *NetConf, ifName string, netns *os.File) error {
return fmt.Errorf("failed to create ipvlan: %v", err)
}
return ns.WithNetNS(netns, false, func(_ *os.File) error {
return netns.Do(func(_ ns.NetNS) error {
err := renameLink(tmpName, ifName)
if err != nil {
return fmt.Errorf("failed to rename ipvlan to %q: %v", ifName, err)
@ -112,9 +111,9 @@ func cmdAdd(args *skel.CmdArgs) error {
return err
}
netns, err := os.Open(args.Netns)
netns, err := ns.GetNS(args.Netns)
if err != nil {
return fmt.Errorf("failed to open netns %q: %v", netns, err)
return fmt.Errorf("failed to open netns %q: %v", args.Netns, err)
}
defer netns.Close()
@ -131,7 +130,7 @@ func cmdAdd(args *skel.CmdArgs) error {
return errors.New("IPAM plugin returned missing IPv4 config")
}
err = ns.WithNetNS(netns, false, func(_ *os.File) error {
err = netns.Do(func(_ ns.NetNS) error {
return ipam.ConfigureIface(args.IfName, result)
})
if err != nil {
@ -153,7 +152,7 @@ func cmdDel(args *skel.CmdArgs) error {
return err
}
return ns.WithNetNSPath(args.Netns, false, func(hostNS *os.File) error {
return ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
return ip.DelLinkByName(args.IfName)
})
}