mirror of
https://github.com/moby/moby.git
synced 2026-07-12 02:25:19 +00:00
4740820716
An ioctl() call to get the "interface index" for a kernel module triggers the kernel to try to load the module, if the process is running with CAP_SYS_MODULE. This tends to be more reliable than "modprobe" for docker-in-docker. If the ioctl() method fails, fall back to trying "modprobe". Signed-off-by: Rob Murray <rob.murray@docker.com>
94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
package ns
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/containerd/log"
|
|
"github.com/docker/docker/internal/modprobe"
|
|
"github.com/docker/docker/internal/nlwrap"
|
|
"github.com/vishvananda/netns"
|
|
)
|
|
|
|
var (
|
|
initNs netns.NsHandle
|
|
initNl nlwrap.Handle
|
|
initOnce sync.Once
|
|
// NetlinkSocketsTimeout represents the default timeout duration for the sockets
|
|
NetlinkSocketsTimeout = 3 * time.Second
|
|
)
|
|
|
|
// Init initializes a new network namespace
|
|
func Init() {
|
|
var err error
|
|
initNs, err = netns.Get()
|
|
if err != nil {
|
|
log.G(context.TODO()).Errorf("could not get initial namespace: %v", err)
|
|
}
|
|
initNl, err = nlwrap.NewHandle(getSupportedNlFamilies()...)
|
|
if err != nil {
|
|
log.G(context.TODO()).Errorf("could not create netlink handle on initial namespace: %v", err)
|
|
}
|
|
err = initNl.SetSocketTimeout(NetlinkSocketsTimeout)
|
|
if err != nil {
|
|
log.G(context.TODO()).Warnf("Failed to set the timeout on the default netlink handle sockets: %v", err)
|
|
}
|
|
}
|
|
|
|
// ParseHandlerInt transforms the namespace handler into an integer
|
|
func ParseHandlerInt() int {
|
|
return int(getHandler())
|
|
}
|
|
|
|
// GetHandler returns the namespace handler
|
|
func getHandler() netns.NsHandle {
|
|
initOnce.Do(Init)
|
|
return initNs
|
|
}
|
|
|
|
// NlHandle returns the netlink handler
|
|
func NlHandle() nlwrap.Handle {
|
|
initOnce.Do(Init)
|
|
return initNl
|
|
}
|
|
|
|
func getSupportedNlFamilies() []int {
|
|
fams := []int{syscall.NETLINK_ROUTE}
|
|
// NETLINK_XFRM test
|
|
if err := checkXfrmSocket(); err != nil {
|
|
log.G(context.TODO()).Warnf("Could not load necessary modules for IPSEC rules: %v", err)
|
|
} else {
|
|
fams = append(fams, syscall.NETLINK_XFRM)
|
|
}
|
|
// NETLINK_NETFILTER test
|
|
if err := modprobe.LoadModules(context.TODO(), checkNfSocket, "nf_conntrack", "nf_conntrack_netlink"); err != nil {
|
|
log.G(context.TODO()).Warnf("Could not load necessary modules for Conntrack: %v", err)
|
|
} else {
|
|
fams = append(fams, syscall.NETLINK_NETFILTER)
|
|
}
|
|
|
|
return fams
|
|
}
|
|
|
|
// API check on required xfrm modules (xfrm_user, xfrm_algo)
|
|
func checkXfrmSocket() error {
|
|
fd, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_RAW, syscall.NETLINK_XFRM)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
syscall.Close(fd)
|
|
return nil
|
|
}
|
|
|
|
// API check on required nf_conntrack* modules (nf_conntrack, nf_conntrack_netlink)
|
|
func checkNfSocket() error {
|
|
fd, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_RAW, syscall.NETLINK_NETFILTER)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
syscall.Close(fd)
|
|
return nil
|
|
}
|