Vendor latest k8s.io/cri-api and netlink

* Bump k8s.io/cri-api to latest version - v0.23.0-alpha.4
* Vendor github.com/vishvananda/netlink for network stats

Signed-off-by: David Porter <porterdavid@google.com>

vendor/github.com/vishvananda/netlink/netns_linux.go

@@ -0,0 +1,141 @@
+package netlink
+
+// Network namespace ID functions
+//
+// The kernel has a weird concept called the network namespace ID.
+// This is different from the file reference in proc (and any bind-mounted
+// namespaces, etc.)
+//
+// Instead, namespaces can be assigned a numeric ID at any time. Once set,
+// the ID is fixed. The ID can either be set manually by the user, or
+// automatically, triggered by certain kernel actions. The most common kernel
+// action that triggers namespace ID creation is moving one end of a veth pair
+// in to that namespace.
+
+import (
+	"fmt"
+
+	"github.com/vishvananda/netlink/nl"
+	"golang.org/x/sys/unix"
+)
+
+// These can be replaced by the values from sys/unix when it is next released.
+const (
+	_ = iota
+	NETNSA_NSID
+	NETNSA_PID
+	NETNSA_FD
+)
+
+// GetNetNsIdByPid looks up the network namespace ID for a given pid (really thread id).
+// Returns -1 if the namespace does not have an ID set.
+func (h *Handle) GetNetNsIdByPid(pid int) (int, error) {
+	return h.getNetNsId(NETNSA_PID, uint32(pid))
+}
+
+// GetNetNsIdByPid looks up the network namespace ID for a given pid (really thread id).
+// Returns -1 if the namespace does not have an ID set.
+func GetNetNsIdByPid(pid int) (int, error) {
+	return pkgHandle.GetNetNsIdByPid(pid)
+}
+
+// SetNetNSIdByPid sets the ID of the network namespace for a given pid (really thread id).
+// The ID can only be set for namespaces without an ID already set.
+func (h *Handle) SetNetNsIdByPid(pid, nsid int) error {
+	return h.setNetNsId(NETNSA_PID, uint32(pid), uint32(nsid))
+}
+
+// SetNetNSIdByPid sets the ID of the network namespace for a given pid (really thread id).
+// The ID can only be set for namespaces without an ID already set.
+func SetNetNsIdByPid(pid, nsid int) error {
+	return pkgHandle.SetNetNsIdByPid(pid, nsid)
+}
+
+// GetNetNsIdByFd looks up the network namespace ID for a given fd.
+// fd must be an open file descriptor to a namespace file.
+// Returns -1 if the namespace does not have an ID set.
+func (h *Handle) GetNetNsIdByFd(fd int) (int, error) {
+	return h.getNetNsId(NETNSA_FD, uint32(fd))
+}
+
+// GetNetNsIdByFd looks up the network namespace ID for a given fd.
+// fd must be an open file descriptor to a namespace file.
+// Returns -1 if the namespace does not have an ID set.
+func GetNetNsIdByFd(fd int) (int, error) {
+	return pkgHandle.GetNetNsIdByFd(fd)
+}
+
+// SetNetNSIdByFd sets the ID of the network namespace for a given fd.
+// fd must be an open file descriptor to a namespace file.
+// The ID can only be set for namespaces without an ID already set.
+func (h *Handle) SetNetNsIdByFd(fd, nsid int) error {
+	return h.setNetNsId(NETNSA_FD, uint32(fd), uint32(nsid))
+}
+
+// SetNetNSIdByFd sets the ID of the network namespace for a given fd.
+// fd must be an open file descriptor to a namespace file.
+// The ID can only be set for namespaces without an ID already set.
+func SetNetNsIdByFd(fd, nsid int) error {
+	return pkgHandle.SetNetNsIdByFd(fd, nsid)
+}
+
+// getNetNsId requests the netnsid for a given type-val pair
+// type should be either NETNSA_PID or NETNSA_FD
+func (h *Handle) getNetNsId(attrType int, val uint32) (int, error) {
+	req := h.newNetlinkRequest(unix.RTM_GETNSID, unix.NLM_F_REQUEST)
+
+	rtgen := nl.NewRtGenMsg()
+	req.AddData(rtgen)
+
+	b := make([]byte, 4, 4)
+	native.PutUint32(b, val)
+	attr := nl.NewRtAttr(attrType, b)
+	req.AddData(attr)
+
+	msgs, err := req.Execute(unix.NETLINK_ROUTE, unix.RTM_NEWNSID)
+
+	if err != nil {
+		return 0, err
+	}
+
+	for _, m := range msgs {
+		msg := nl.DeserializeRtGenMsg(m)
+
+		attrs, err := nl.ParseRouteAttr(m[msg.Len():])
+		if err != nil {
+			return 0, err
+		}
+
+		for _, attr := range attrs {
+			switch attr.Attr.Type {
+			case NETNSA_NSID:
+				return int(int32(native.Uint32(attr.Value))), nil
+			}
+		}
+	}
+
+	return 0, fmt.Errorf("unexpected empty result")
+}
+
+// setNetNsId sets the netnsid for a given type-val pair
+// type should be either NETNSA_PID or NETNSA_FD
+// The ID can only be set for namespaces without an ID already set
+func (h *Handle) setNetNsId(attrType int, val uint32, newnsid uint32) error {
+	req := h.newNetlinkRequest(unix.RTM_NEWNSID, unix.NLM_F_REQUEST|unix.NLM_F_ACK)
+
+	rtgen := nl.NewRtGenMsg()
+	req.AddData(rtgen)
+
+	b := make([]byte, 4, 4)
+	native.PutUint32(b, val)
+	attr := nl.NewRtAttr(attrType, b)
+	req.AddData(attr)
+
+	b1 := make([]byte, 4, 4)
+	native.PutUint32(b1, newnsid)
+	attr1 := nl.NewRtAttr(NETNSA_NSID, b1)
+	req.AddData(attr1)
+
+	_, err := req.Execute(unix.NETLINK_ROUTE, unix.RTM_NEWNSID)
+	return err
+}