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package netlink
import (
"errors"
"fmt"
"net"
"strings"
"syscall"
"github.com/vishvananda/netlink/nl"
"golang.org/x/sys/unix"
)
type PDP struct {
Version uint32
TID uint64
PeerAddress net.IP
MSAddress net.IP
Flow uint16
NetNSFD uint32
ITEI uint32
OTEI uint32
}
func (pdp *PDP) String() string {
elems := []string{}
elems = append(elems, fmt.Sprintf("Version: %d", pdp.Version))
if pdp.Version == 0 {
elems = append(elems, fmt.Sprintf("TID: %d", pdp.TID))
} else if pdp.Version == 1 {
elems = append(elems, fmt.Sprintf("TEI: %d/%d", pdp.ITEI, pdp.OTEI))
}
elems = append(elems, fmt.Sprintf("MS-Address: %s", pdp.MSAddress))
elems = append(elems, fmt.Sprintf("Peer-Address: %s", pdp.PeerAddress))
return fmt.Sprintf("{%s}", strings.Join(elems, " "))
}
func (p *PDP) parseAttributes(attrs []syscall.NetlinkRouteAttr) error {
for _, a := range attrs {
switch a.Attr.Type {
case nl.GENL_GTP_ATTR_VERSION:
p.Version = native.Uint32(a.Value)
case nl.GENL_GTP_ATTR_TID:
p.TID = native.Uint64(a.Value)
case nl.GENL_GTP_ATTR_PEER_ADDRESS:
p.PeerAddress = net.IP(a.Value)
case nl.GENL_GTP_ATTR_MS_ADDRESS:
p.MSAddress = net.IP(a.Value)
case nl.GENL_GTP_ATTR_FLOW:
p.Flow = native.Uint16(a.Value)
case nl.GENL_GTP_ATTR_NET_NS_FD:
p.NetNSFD = native.Uint32(a.Value)
case nl.GENL_GTP_ATTR_I_TEI:
p.ITEI = native.Uint32(a.Value)
case nl.GENL_GTP_ATTR_O_TEI:
p.OTEI = native.Uint32(a.Value)
}
}
return nil
}
func parsePDP(msgs [][]byte) ([]*PDP, error) {
pdps := make([]*PDP, 0, len(msgs))
for _, m := range msgs {
attrs, err := nl.ParseRouteAttr(m[nl.SizeofGenlmsg:])
if err != nil {
return nil, err
}
pdp := &PDP{}
if err := pdp.parseAttributes(attrs); err != nil {
return nil, err
}
pdps = append(pdps, pdp)
}
return pdps, nil
}
// If the returned error is [ErrDumpInterrupted], results may be inconsistent
// or incomplete.
func (h *Handle) GTPPDPList() ([]*PDP, error) {
f, err := h.GenlFamilyGet(nl.GENL_GTP_NAME)
if err != nil {
return nil, err
}
msg := &nl.Genlmsg{
Command: nl.GENL_GTP_CMD_GETPDP,
Version: nl.GENL_GTP_VERSION,
}
req := h.newNetlinkRequest(int(f.ID), unix.NLM_F_DUMP)
req.AddData(msg)
msgs, executeErr := req.Execute(unix.NETLINK_GENERIC, 0)
if executeErr != nil && !errors.Is(err, ErrDumpInterrupted) {
return nil, executeErr
}
pdps, err := parsePDP(msgs)
if err != nil {
return nil, err
}
return pdps, executeErr
}
// If the returned error is [ErrDumpInterrupted], results may be inconsistent
// or incomplete.
func GTPPDPList() ([]*PDP, error) {
return pkgHandle.GTPPDPList()
}
func gtpPDPGet(req *nl.NetlinkRequest) (*PDP, error) {
msgs, err := req.Execute(unix.NETLINK_GENERIC, 0)
if err != nil {
return nil, err
}
pdps, err := parsePDP(msgs)
if err != nil {
return nil, err
}
if len(pdps) != 1 {
return nil, fmt.Errorf("invalid reqponse for GENL_GTP_CMD_GETPDP")
}
return pdps[0], nil
}
func (h *Handle) GTPPDPByTID(link Link, tid int) (*PDP, error) {
f, err := h.GenlFamilyGet(nl.GENL_GTP_NAME)
if err != nil {
return nil, err
}
msg := &nl.Genlmsg{
Command: nl.GENL_GTP_CMD_GETPDP,
Version: nl.GENL_GTP_VERSION,
}
req := h.newNetlinkRequest(int(f.ID), 0)
req.AddData(msg)
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_VERSION, nl.Uint32Attr(0)))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_LINK, nl.Uint32Attr(uint32(link.Attrs().Index))))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_TID, nl.Uint64Attr(uint64(tid))))
return gtpPDPGet(req)
}
func GTPPDPByTID(link Link, tid int) (*PDP, error) {
return pkgHandle.GTPPDPByTID(link, tid)
}
func (h *Handle) GTPPDPByITEI(link Link, itei int) (*PDP, error) {
f, err := h.GenlFamilyGet(nl.GENL_GTP_NAME)
if err != nil {
return nil, err
}
msg := &nl.Genlmsg{
Command: nl.GENL_GTP_CMD_GETPDP,
Version: nl.GENL_GTP_VERSION,
}
req := h.newNetlinkRequest(int(f.ID), 0)
req.AddData(msg)
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_VERSION, nl.Uint32Attr(1)))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_LINK, nl.Uint32Attr(uint32(link.Attrs().Index))))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_I_TEI, nl.Uint32Attr(uint32(itei))))
return gtpPDPGet(req)
}
func GTPPDPByITEI(link Link, itei int) (*PDP, error) {
return pkgHandle.GTPPDPByITEI(link, itei)
}
func (h *Handle) GTPPDPByMSAddress(link Link, addr net.IP) (*PDP, error) {
f, err := h.GenlFamilyGet(nl.GENL_GTP_NAME)
if err != nil {
return nil, err
}
msg := &nl.Genlmsg{
Command: nl.GENL_GTP_CMD_GETPDP,
Version: nl.GENL_GTP_VERSION,
}
req := h.newNetlinkRequest(int(f.ID), 0)
req.AddData(msg)
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_VERSION, nl.Uint32Attr(0)))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_LINK, nl.Uint32Attr(uint32(link.Attrs().Index))))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_MS_ADDRESS, []byte(addr.To4())))
return gtpPDPGet(req)
}
func GTPPDPByMSAddress(link Link, addr net.IP) (*PDP, error) {
return pkgHandle.GTPPDPByMSAddress(link, addr)
}
func (h *Handle) GTPPDPAdd(link Link, pdp *PDP) error {
f, err := h.GenlFamilyGet(nl.GENL_GTP_NAME)
if err != nil {
return err
}
msg := &nl.Genlmsg{
Command: nl.GENL_GTP_CMD_NEWPDP,
Version: nl.GENL_GTP_VERSION,
}
req := h.newNetlinkRequest(int(f.ID), unix.NLM_F_EXCL|unix.NLM_F_ACK)
req.AddData(msg)
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_VERSION, nl.Uint32Attr(pdp.Version)))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_LINK, nl.Uint32Attr(uint32(link.Attrs().Index))))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_PEER_ADDRESS, []byte(pdp.PeerAddress.To4())))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_MS_ADDRESS, []byte(pdp.MSAddress.To4())))
switch pdp.Version {
case 0:
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_TID, nl.Uint64Attr(pdp.TID)))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_FLOW, nl.Uint16Attr(pdp.Flow)))
case 1:
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_I_TEI, nl.Uint32Attr(pdp.ITEI)))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_O_TEI, nl.Uint32Attr(pdp.OTEI)))
default:
return fmt.Errorf("unsupported GTP version: %d", pdp.Version)
}
_, err = req.Execute(unix.NETLINK_GENERIC, 0)
return err
}
func GTPPDPAdd(link Link, pdp *PDP) error {
return pkgHandle.GTPPDPAdd(link, pdp)
}
func (h *Handle) GTPPDPDel(link Link, pdp *PDP) error {
f, err := h.GenlFamilyGet(nl.GENL_GTP_NAME)
if err != nil {
return err
}
msg := &nl.Genlmsg{
Command: nl.GENL_GTP_CMD_DELPDP,
Version: nl.GENL_GTP_VERSION,
}
req := h.newNetlinkRequest(int(f.ID), unix.NLM_F_EXCL|unix.NLM_F_ACK)
req.AddData(msg)
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_VERSION, nl.Uint32Attr(pdp.Version)))
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_LINK, nl.Uint32Attr(uint32(link.Attrs().Index))))
switch pdp.Version {
case 0:
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_TID, nl.Uint64Attr(pdp.TID)))
case 1:
req.AddData(nl.NewRtAttr(nl.GENL_GTP_ATTR_I_TEI, nl.Uint32Attr(pdp.ITEI)))
default:
return fmt.Errorf("unsupported GTP version: %d", pdp.Version)
}
_, err = req.Execute(unix.NETLINK_GENERIC, 0)
return err
}
func GTPPDPDel(link Link, pdp *PDP) error {
return pkgHandle.GTPPDPDel(link, pdp)
}
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