463 lines
13 KiB
Go
463 lines
13 KiB
Go
package netlink
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import (
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"fmt"
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"unsafe"
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"github.com/vishvananda/netlink/nl"
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"golang.org/x/sys/unix"
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)
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func writeStateAlgo(a *XfrmStateAlgo) []byte {
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algo := nl.XfrmAlgo{
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AlgKeyLen: uint32(len(a.Key) * 8),
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AlgKey: a.Key,
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}
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end := len(a.Name)
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if end > 64 {
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end = 64
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}
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copy(algo.AlgName[:end], a.Name)
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return algo.Serialize()
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}
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func writeStateAlgoAuth(a *XfrmStateAlgo) []byte {
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algo := nl.XfrmAlgoAuth{
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AlgKeyLen: uint32(len(a.Key) * 8),
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AlgTruncLen: uint32(a.TruncateLen),
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AlgKey: a.Key,
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}
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end := len(a.Name)
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if end > 64 {
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end = 64
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}
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copy(algo.AlgName[:end], a.Name)
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return algo.Serialize()
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}
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func writeStateAlgoAead(a *XfrmStateAlgo) []byte {
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algo := nl.XfrmAlgoAEAD{
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AlgKeyLen: uint32(len(a.Key) * 8),
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AlgICVLen: uint32(a.ICVLen),
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AlgKey: a.Key,
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}
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end := len(a.Name)
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if end > 64 {
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end = 64
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}
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copy(algo.AlgName[:end], a.Name)
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return algo.Serialize()
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}
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func writeMark(m *XfrmMark) []byte {
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mark := &nl.XfrmMark{
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Value: m.Value,
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Mask: m.Mask,
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}
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if mark.Mask == 0 {
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mark.Mask = ^uint32(0)
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}
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return mark.Serialize()
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}
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func writeReplayEsn(replayWindow int) []byte {
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replayEsn := &nl.XfrmReplayStateEsn{
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OSeq: 0,
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Seq: 0,
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OSeqHi: 0,
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SeqHi: 0,
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ReplayWindow: uint32(replayWindow),
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}
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// Linux stores the bitmap to identify the already received sequence packets in blocks of uint32 elements.
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// Therefore bitmap length is the minimum number of uint32 elements needed. The following is a ceiling operation.
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bytesPerElem := int(unsafe.Sizeof(replayEsn.BmpLen)) // Any uint32 variable is good for this
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replayEsn.BmpLen = uint32((replayWindow + (bytesPerElem * 8) - 1) / (bytesPerElem * 8))
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return replayEsn.Serialize()
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}
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// XfrmStateAdd will add an xfrm state to the system.
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// Equivalent to: `ip xfrm state add $state`
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func XfrmStateAdd(state *XfrmState) error {
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return pkgHandle.XfrmStateAdd(state)
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}
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// XfrmStateAdd will add an xfrm state to the system.
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// Equivalent to: `ip xfrm state add $state`
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func (h *Handle) XfrmStateAdd(state *XfrmState) error {
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return h.xfrmStateAddOrUpdate(state, nl.XFRM_MSG_NEWSA)
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}
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// XfrmStateAllocSpi will allocate an xfrm state in the system.
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// Equivalent to: `ip xfrm state allocspi`
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func XfrmStateAllocSpi(state *XfrmState) (*XfrmState, error) {
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return pkgHandle.xfrmStateAllocSpi(state)
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}
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// XfrmStateUpdate will update an xfrm state to the system.
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// Equivalent to: `ip xfrm state update $state`
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func XfrmStateUpdate(state *XfrmState) error {
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return pkgHandle.XfrmStateUpdate(state)
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}
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// XfrmStateUpdate will update an xfrm state to the system.
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// Equivalent to: `ip xfrm state update $state`
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func (h *Handle) XfrmStateUpdate(state *XfrmState) error {
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return h.xfrmStateAddOrUpdate(state, nl.XFRM_MSG_UPDSA)
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}
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func (h *Handle) xfrmStateAddOrUpdate(state *XfrmState, nlProto int) error {
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// A state with spi 0 can't be deleted so don't allow it to be set
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if state.Spi == 0 {
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return fmt.Errorf("Spi must be set when adding xfrm state.")
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}
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req := h.newNetlinkRequest(nlProto, unix.NLM_F_CREATE|unix.NLM_F_EXCL|unix.NLM_F_ACK)
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msg := xfrmUsersaInfoFromXfrmState(state)
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if state.ESN {
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if state.ReplayWindow == 0 {
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return fmt.Errorf("ESN flag set without ReplayWindow")
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}
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msg.Flags |= nl.XFRM_STATE_ESN
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msg.ReplayWindow = 0
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}
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limitsToLft(state.Limits, &msg.Lft)
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req.AddData(msg)
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if state.Auth != nil {
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out := nl.NewRtAttr(nl.XFRMA_ALG_AUTH_TRUNC, writeStateAlgoAuth(state.Auth))
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req.AddData(out)
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}
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if state.Crypt != nil {
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out := nl.NewRtAttr(nl.XFRMA_ALG_CRYPT, writeStateAlgo(state.Crypt))
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req.AddData(out)
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}
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if state.Aead != nil {
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out := nl.NewRtAttr(nl.XFRMA_ALG_AEAD, writeStateAlgoAead(state.Aead))
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req.AddData(out)
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}
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if state.Encap != nil {
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encapData := make([]byte, nl.SizeofXfrmEncapTmpl)
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encap := nl.DeserializeXfrmEncapTmpl(encapData)
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encap.EncapType = uint16(state.Encap.Type)
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encap.EncapSport = nl.Swap16(uint16(state.Encap.SrcPort))
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encap.EncapDport = nl.Swap16(uint16(state.Encap.DstPort))
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encap.EncapOa.FromIP(state.Encap.OriginalAddress)
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out := nl.NewRtAttr(nl.XFRMA_ENCAP, encapData)
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req.AddData(out)
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}
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if state.Mark != nil {
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out := nl.NewRtAttr(nl.XFRMA_MARK, writeMark(state.Mark))
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req.AddData(out)
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}
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if state.ESN {
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out := nl.NewRtAttr(nl.XFRMA_REPLAY_ESN_VAL, writeReplayEsn(state.ReplayWindow))
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req.AddData(out)
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}
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if state.OutputMark != 0 {
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out := nl.NewRtAttr(nl.XFRMA_OUTPUT_MARK, nl.Uint32Attr(uint32(state.OutputMark)))
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req.AddData(out)
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}
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ifId := nl.NewRtAttr(nl.XFRMA_IF_ID, nl.Uint32Attr(uint32(state.Ifid)))
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req.AddData(ifId)
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_, err := req.Execute(unix.NETLINK_XFRM, 0)
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return err
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}
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func (h *Handle) xfrmStateAllocSpi(state *XfrmState) (*XfrmState, error) {
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req := h.newNetlinkRequest(nl.XFRM_MSG_ALLOCSPI,
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unix.NLM_F_CREATE|unix.NLM_F_EXCL|unix.NLM_F_ACK)
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msg := &nl.XfrmUserSpiInfo{}
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msg.XfrmUsersaInfo = *(xfrmUsersaInfoFromXfrmState(state))
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// 1-255 is reserved by IANA for future use
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msg.Min = 0x100
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msg.Max = 0xffffffff
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req.AddData(msg)
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if state.Mark != nil {
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out := nl.NewRtAttr(nl.XFRMA_MARK, writeMark(state.Mark))
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req.AddData(out)
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}
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msgs, err := req.Execute(unix.NETLINK_XFRM, 0)
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if err != nil {
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return nil, err
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}
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return parseXfrmState(msgs[0], FAMILY_ALL)
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}
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// XfrmStateDel will delete an xfrm state from the system. Note that
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// the Algos are ignored when matching the state to delete.
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// Equivalent to: `ip xfrm state del $state`
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func XfrmStateDel(state *XfrmState) error {
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return pkgHandle.XfrmStateDel(state)
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}
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// XfrmStateDel will delete an xfrm state from the system. Note that
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// the Algos are ignored when matching the state to delete.
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// Equivalent to: `ip xfrm state del $state`
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func (h *Handle) XfrmStateDel(state *XfrmState) error {
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_, err := h.xfrmStateGetOrDelete(state, nl.XFRM_MSG_DELSA)
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return err
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}
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// XfrmStateList gets a list of xfrm states in the system.
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// Equivalent to: `ip [-4|-6] xfrm state show`.
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// The list can be filtered by ip family.
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func XfrmStateList(family int) ([]XfrmState, error) {
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return pkgHandle.XfrmStateList(family)
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}
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// XfrmStateList gets a list of xfrm states in the system.
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// Equivalent to: `ip xfrm state show`.
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// The list can be filtered by ip family.
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func (h *Handle) XfrmStateList(family int) ([]XfrmState, error) {
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req := h.newNetlinkRequest(nl.XFRM_MSG_GETSA, unix.NLM_F_DUMP)
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msgs, err := req.Execute(unix.NETLINK_XFRM, nl.XFRM_MSG_NEWSA)
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if err != nil {
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return nil, err
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}
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var res []XfrmState
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for _, m := range msgs {
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if state, err := parseXfrmState(m, family); err == nil {
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res = append(res, *state)
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} else if err == familyError {
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continue
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} else {
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return nil, err
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}
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}
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return res, nil
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}
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// XfrmStateGet gets the xfrm state described by the ID, if found.
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// Equivalent to: `ip xfrm state get ID [ mark MARK [ mask MASK ] ]`.
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// Only the fields which constitue the SA ID must be filled in:
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// ID := [ src ADDR ] [ dst ADDR ] [ proto XFRM-PROTO ] [ spi SPI ]
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// mark is optional
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func XfrmStateGet(state *XfrmState) (*XfrmState, error) {
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return pkgHandle.XfrmStateGet(state)
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}
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// XfrmStateGet gets the xfrm state described by the ID, if found.
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// Equivalent to: `ip xfrm state get ID [ mark MARK [ mask MASK ] ]`.
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// Only the fields which constitue the SA ID must be filled in:
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// ID := [ src ADDR ] [ dst ADDR ] [ proto XFRM-PROTO ] [ spi SPI ]
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// mark is optional
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func (h *Handle) XfrmStateGet(state *XfrmState) (*XfrmState, error) {
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return h.xfrmStateGetOrDelete(state, nl.XFRM_MSG_GETSA)
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}
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func (h *Handle) xfrmStateGetOrDelete(state *XfrmState, nlProto int) (*XfrmState, error) {
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req := h.newNetlinkRequest(nlProto, unix.NLM_F_ACK)
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msg := &nl.XfrmUsersaId{}
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msg.Family = uint16(nl.GetIPFamily(state.Dst))
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msg.Daddr.FromIP(state.Dst)
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msg.Proto = uint8(state.Proto)
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msg.Spi = nl.Swap32(uint32(state.Spi))
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req.AddData(msg)
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if state.Mark != nil {
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out := nl.NewRtAttr(nl.XFRMA_MARK, writeMark(state.Mark))
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req.AddData(out)
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}
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if state.Src != nil {
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out := nl.NewRtAttr(nl.XFRMA_SRCADDR, state.Src.To16())
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req.AddData(out)
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}
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ifId := nl.NewRtAttr(nl.XFRMA_IF_ID, nl.Uint32Attr(uint32(state.Ifid)))
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req.AddData(ifId)
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resType := nl.XFRM_MSG_NEWSA
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if nlProto == nl.XFRM_MSG_DELSA {
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resType = 0
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}
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msgs, err := req.Execute(unix.NETLINK_XFRM, uint16(resType))
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if err != nil {
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return nil, err
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}
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if nlProto == nl.XFRM_MSG_DELSA {
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return nil, nil
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}
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s, err := parseXfrmState(msgs[0], FAMILY_ALL)
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if err != nil {
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return nil, err
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}
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return s, nil
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}
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var familyError = fmt.Errorf("family error")
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func xfrmStateFromXfrmUsersaInfo(msg *nl.XfrmUsersaInfo) *XfrmState {
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var state XfrmState
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state.Dst = msg.Id.Daddr.ToIP()
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state.Src = msg.Saddr.ToIP()
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state.Proto = Proto(msg.Id.Proto)
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state.Mode = Mode(msg.Mode)
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state.Spi = int(nl.Swap32(msg.Id.Spi))
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state.Reqid = int(msg.Reqid)
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state.ReplayWindow = int(msg.ReplayWindow)
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lftToLimits(&msg.Lft, &state.Limits)
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curToStats(&msg.Curlft, &msg.Stats, &state.Statistics)
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return &state
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}
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func parseXfrmState(m []byte, family int) (*XfrmState, error) {
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msg := nl.DeserializeXfrmUsersaInfo(m)
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// This is mainly for the state dump
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if family != FAMILY_ALL && family != int(msg.Family) {
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return nil, familyError
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}
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state := xfrmStateFromXfrmUsersaInfo(msg)
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attrs, err := nl.ParseRouteAttr(m[nl.SizeofXfrmUsersaInfo:])
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if err != nil {
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return nil, err
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}
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for _, attr := range attrs {
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switch attr.Attr.Type {
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case nl.XFRMA_ALG_AUTH, nl.XFRMA_ALG_CRYPT:
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var resAlgo *XfrmStateAlgo
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if attr.Attr.Type == nl.XFRMA_ALG_AUTH {
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if state.Auth == nil {
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state.Auth = new(XfrmStateAlgo)
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}
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resAlgo = state.Auth
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} else {
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state.Crypt = new(XfrmStateAlgo)
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resAlgo = state.Crypt
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}
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algo := nl.DeserializeXfrmAlgo(attr.Value[:])
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(*resAlgo).Name = nl.BytesToString(algo.AlgName[:])
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(*resAlgo).Key = algo.AlgKey
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case nl.XFRMA_ALG_AUTH_TRUNC:
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if state.Auth == nil {
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state.Auth = new(XfrmStateAlgo)
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}
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algo := nl.DeserializeXfrmAlgoAuth(attr.Value[:])
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state.Auth.Name = nl.BytesToString(algo.AlgName[:])
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state.Auth.Key = algo.AlgKey
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state.Auth.TruncateLen = int(algo.AlgTruncLen)
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case nl.XFRMA_ALG_AEAD:
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state.Aead = new(XfrmStateAlgo)
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algo := nl.DeserializeXfrmAlgoAEAD(attr.Value[:])
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state.Aead.Name = nl.BytesToString(algo.AlgName[:])
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state.Aead.Key = algo.AlgKey
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state.Aead.ICVLen = int(algo.AlgICVLen)
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case nl.XFRMA_ENCAP:
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encap := nl.DeserializeXfrmEncapTmpl(attr.Value[:])
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state.Encap = new(XfrmStateEncap)
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state.Encap.Type = EncapType(encap.EncapType)
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state.Encap.SrcPort = int(nl.Swap16(encap.EncapSport))
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state.Encap.DstPort = int(nl.Swap16(encap.EncapDport))
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state.Encap.OriginalAddress = encap.EncapOa.ToIP()
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case nl.XFRMA_MARK:
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mark := nl.DeserializeXfrmMark(attr.Value[:])
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state.Mark = new(XfrmMark)
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state.Mark.Value = mark.Value
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state.Mark.Mask = mark.Mask
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case nl.XFRMA_OUTPUT_MARK:
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state.OutputMark = int(native.Uint32(attr.Value))
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case nl.XFRMA_IF_ID:
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state.Ifid = int(native.Uint32(attr.Value))
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}
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}
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return state, nil
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}
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// XfrmStateFlush will flush the xfrm state on the system.
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// proto = 0 means any transformation protocols
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// Equivalent to: `ip xfrm state flush [ proto XFRM-PROTO ]`
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func XfrmStateFlush(proto Proto) error {
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return pkgHandle.XfrmStateFlush(proto)
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}
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// XfrmStateFlush will flush the xfrm state on the system.
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// proto = 0 means any transformation protocols
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// Equivalent to: `ip xfrm state flush [ proto XFRM-PROTO ]`
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func (h *Handle) XfrmStateFlush(proto Proto) error {
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req := h.newNetlinkRequest(nl.XFRM_MSG_FLUSHSA, unix.NLM_F_ACK)
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req.AddData(&nl.XfrmUsersaFlush{Proto: uint8(proto)})
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_, err := req.Execute(unix.NETLINK_XFRM, 0)
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return err
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}
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func limitsToLft(lmts XfrmStateLimits, lft *nl.XfrmLifetimeCfg) {
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if lmts.ByteSoft != 0 {
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lft.SoftByteLimit = lmts.ByteSoft
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} else {
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lft.SoftByteLimit = nl.XFRM_INF
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}
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if lmts.ByteHard != 0 {
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lft.HardByteLimit = lmts.ByteHard
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} else {
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lft.HardByteLimit = nl.XFRM_INF
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}
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if lmts.PacketSoft != 0 {
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lft.SoftPacketLimit = lmts.PacketSoft
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} else {
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lft.SoftPacketLimit = nl.XFRM_INF
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}
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if lmts.PacketHard != 0 {
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lft.HardPacketLimit = lmts.PacketHard
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} else {
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lft.HardPacketLimit = nl.XFRM_INF
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}
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lft.SoftAddExpiresSeconds = lmts.TimeSoft
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lft.HardAddExpiresSeconds = lmts.TimeHard
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lft.SoftUseExpiresSeconds = lmts.TimeUseSoft
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lft.HardUseExpiresSeconds = lmts.TimeUseHard
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}
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func lftToLimits(lft *nl.XfrmLifetimeCfg, lmts *XfrmStateLimits) {
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*lmts = *(*XfrmStateLimits)(unsafe.Pointer(lft))
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}
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func curToStats(cur *nl.XfrmLifetimeCur, wstats *nl.XfrmStats, stats *XfrmStateStats) {
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stats.Bytes = cur.Bytes
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stats.Packets = cur.Packets
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stats.AddTime = cur.AddTime
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stats.UseTime = cur.UseTime
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stats.ReplayWindow = wstats.ReplayWindow
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stats.Replay = wstats.Replay
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stats.Failed = wstats.IntegrityFailed
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}
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func xfrmUsersaInfoFromXfrmState(state *XfrmState) *nl.XfrmUsersaInfo {
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msg := &nl.XfrmUsersaInfo{}
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msg.Family = uint16(nl.GetIPFamily(state.Dst))
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msg.Id.Daddr.FromIP(state.Dst)
|
|
msg.Saddr.FromIP(state.Src)
|
|
msg.Id.Proto = uint8(state.Proto)
|
|
msg.Mode = uint8(state.Mode)
|
|
msg.Id.Spi = nl.Swap32(uint32(state.Spi))
|
|
msg.Reqid = uint32(state.Reqid)
|
|
msg.ReplayWindow = uint8(state.ReplayWindow)
|
|
|
|
return msg
|
|
}
|