264 lines
8 KiB
Go
264 lines
8 KiB
Go
|
package netlink
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/vishvananda/netlink/nl"
|
||
|
|
"golang.org/x/sys/unix"
|
||
|
|
)
|
||
|
|
|
||
|
|
func selFromPolicy(sel *nl.XfrmSelector, policy *XfrmPolicy) {
|
||
|
|
sel.Family = uint16(nl.FAMILY_V4)
|
||
|
|
if policy.Dst != nil {
|
||
|
|
sel.Family = uint16(nl.GetIPFamily(policy.Dst.IP))
|
||
|
|
sel.Daddr.FromIP(policy.Dst.IP)
|
||
|
|
prefixlenD, _ := policy.Dst.Mask.Size()
|
||
|
|
sel.PrefixlenD = uint8(prefixlenD)
|
||
|
|
}
|
||
|
|
if policy.Src != nil {
|
||
|
|
sel.Saddr.FromIP(policy.Src.IP)
|
||
|
|
prefixlenS, _ := policy.Src.Mask.Size()
|
||
|
|
sel.PrefixlenS = uint8(prefixlenS)
|
||
|
|
}
|
||
|
|
sel.Proto = uint8(policy.Proto)
|
||
|
|
sel.Dport = nl.Swap16(uint16(policy.DstPort))
|
||
|
|
sel.Sport = nl.Swap16(uint16(policy.SrcPort))
|
||
|
|
if sel.Dport != 0 {
|
||
|
|
sel.DportMask = ^uint16(0)
|
||
|
|
}
|
||
|
|
if sel.Sport != 0 {
|
||
|
|
sel.SportMask = ^uint16(0)
|
||
|
|
}
|
||
|
|
sel.Ifindex = int32(policy.Ifindex)
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyAdd will add an xfrm policy to the system.
|
||
|
|
// Equivalent to: `ip xfrm policy add $policy`
|
||
|
|
func XfrmPolicyAdd(policy *XfrmPolicy) error {
|
||
|
|
return pkgHandle.XfrmPolicyAdd(policy)
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyAdd will add an xfrm policy to the system.
|
||
|
|
// Equivalent to: `ip xfrm policy add $policy`
|
||
|
|
func (h *Handle) XfrmPolicyAdd(policy *XfrmPolicy) error {
|
||
|
|
return h.xfrmPolicyAddOrUpdate(policy, nl.XFRM_MSG_NEWPOLICY)
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyUpdate will update an xfrm policy to the system.
|
||
|
|
// Equivalent to: `ip xfrm policy update $policy`
|
||
|
|
func XfrmPolicyUpdate(policy *XfrmPolicy) error {
|
||
|
|
return pkgHandle.XfrmPolicyUpdate(policy)
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyUpdate will update an xfrm policy to the system.
|
||
|
|
// Equivalent to: `ip xfrm policy update $policy`
|
||
|
|
func (h *Handle) XfrmPolicyUpdate(policy *XfrmPolicy) error {
|
||
|
|
return h.xfrmPolicyAddOrUpdate(policy, nl.XFRM_MSG_UPDPOLICY)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (h *Handle) xfrmPolicyAddOrUpdate(policy *XfrmPolicy, nlProto int) error {
|
||
|
|
req := h.newNetlinkRequest(nlProto, unix.NLM_F_CREATE|unix.NLM_F_EXCL|unix.NLM_F_ACK)
|
||
|
|
|
||
|
|
msg := &nl.XfrmUserpolicyInfo{}
|
||
|
|
selFromPolicy(&msg.Sel, policy)
|
||
|
|
msg.Priority = uint32(policy.Priority)
|
||
|
|
msg.Index = uint32(policy.Index)
|
||
|
|
msg.Dir = uint8(policy.Dir)
|
||
|
|
msg.Action = uint8(policy.Action)
|
||
|
|
msg.Lft.SoftByteLimit = nl.XFRM_INF
|
||
|
|
msg.Lft.HardByteLimit = nl.XFRM_INF
|
||
|
|
msg.Lft.SoftPacketLimit = nl.XFRM_INF
|
||
|
|
msg.Lft.HardPacketLimit = nl.XFRM_INF
|
||
|
|
req.AddData(msg)
|
||
|
|
|
||
|
|
tmplData := make([]byte, nl.SizeofXfrmUserTmpl*len(policy.Tmpls))
|
||
|
|
for i, tmpl := range policy.Tmpls {
|
||
|
|
start := i * nl.SizeofXfrmUserTmpl
|
||
|
|
userTmpl := nl.DeserializeXfrmUserTmpl(tmplData[start : start+nl.SizeofXfrmUserTmpl])
|
||
|
|
userTmpl.XfrmId.Daddr.FromIP(tmpl.Dst)
|
||
|
|
userTmpl.Saddr.FromIP(tmpl.Src)
|
||
|
|
userTmpl.XfrmId.Proto = uint8(tmpl.Proto)
|
||
|
|
userTmpl.XfrmId.Spi = nl.Swap32(uint32(tmpl.Spi))
|
||
|
|
userTmpl.Mode = uint8(tmpl.Mode)
|
||
|
|
userTmpl.Reqid = uint32(tmpl.Reqid)
|
||
|
|
userTmpl.Aalgos = ^uint32(0)
|
||
|
|
userTmpl.Ealgos = ^uint32(0)
|
||
|
|
userTmpl.Calgos = ^uint32(0)
|
||
|
|
}
|
||
|
|
if len(tmplData) > 0 {
|
||
|
|
tmpls := nl.NewRtAttr(nl.XFRMA_TMPL, tmplData)
|
||
|
|
req.AddData(tmpls)
|
||
|
|
}
|
||
|
|
if policy.Mark != nil {
|
||
|
|
out := nl.NewRtAttr(nl.XFRMA_MARK, writeMark(policy.Mark))
|
||
|
|
req.AddData(out)
|
||
|
|
}
|
||
|
|
|
||
|
|
ifId := nl.NewRtAttr(nl.XFRMA_IF_ID, nl.Uint32Attr(uint32(policy.Ifid)))
|
||
|
|
req.AddData(ifId)
|
||
|
|
|
||
|
|
_, err := req.Execute(unix.NETLINK_XFRM, 0)
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyDel will delete an xfrm policy from the system. Note that
|
||
|
|
// the Tmpls are ignored when matching the policy to delete.
|
||
|
|
// Equivalent to: `ip xfrm policy del $policy`
|
||
|
|
func XfrmPolicyDel(policy *XfrmPolicy) error {
|
||
|
|
return pkgHandle.XfrmPolicyDel(policy)
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyDel will delete an xfrm policy from the system. Note that
|
||
|
|
// the Tmpls are ignored when matching the policy to delete.
|
||
|
|
// Equivalent to: `ip xfrm policy del $policy`
|
||
|
|
func (h *Handle) XfrmPolicyDel(policy *XfrmPolicy) error {
|
||
|
|
_, err := h.xfrmPolicyGetOrDelete(policy, nl.XFRM_MSG_DELPOLICY)
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyList gets a list of xfrm policies in the system.
|
||
|
|
// Equivalent to: `ip xfrm policy show`.
|
||
|
|
// The list can be filtered by ip family.
|
||
|
|
func XfrmPolicyList(family int) ([]XfrmPolicy, error) {
|
||
|
|
return pkgHandle.XfrmPolicyList(family)
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyList gets a list of xfrm policies in the system.
|
||
|
|
// Equivalent to: `ip xfrm policy show`.
|
||
|
|
// The list can be filtered by ip family.
|
||
|
|
func (h *Handle) XfrmPolicyList(family int) ([]XfrmPolicy, error) {
|
||
|
|
req := h.newNetlinkRequest(nl.XFRM_MSG_GETPOLICY, unix.NLM_F_DUMP)
|
||
|
|
|
||
|
|
msg := nl.NewIfInfomsg(family)
|
||
|
|
req.AddData(msg)
|
||
|
|
|
||
|
|
msgs, err := req.Execute(unix.NETLINK_XFRM, nl.XFRM_MSG_NEWPOLICY)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
var res []XfrmPolicy
|
||
|
|
for _, m := range msgs {
|
||
|
|
if policy, err := parseXfrmPolicy(m, family); err == nil {
|
||
|
|
res = append(res, *policy)
|
||
|
|
} else if err == familyError {
|
||
|
|
continue
|
||
|
|
} else {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return res, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyGet gets a the policy described by the index or selector, if found.
|
||
|
|
// Equivalent to: `ip xfrm policy get { SELECTOR | index INDEX } dir DIR [ctx CTX ] [ mark MARK [ mask MASK ] ] [ ptype PTYPE ]`.
|
||
|
|
func XfrmPolicyGet(policy *XfrmPolicy) (*XfrmPolicy, error) {
|
||
|
|
return pkgHandle.XfrmPolicyGet(policy)
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyGet gets a the policy described by the index or selector, if found.
|
||
|
|
// Equivalent to: `ip xfrm policy get { SELECTOR | index INDEX } dir DIR [ctx CTX ] [ mark MARK [ mask MASK ] ] [ ptype PTYPE ]`.
|
||
|
|
func (h *Handle) XfrmPolicyGet(policy *XfrmPolicy) (*XfrmPolicy, error) {
|
||
|
|
return h.xfrmPolicyGetOrDelete(policy, nl.XFRM_MSG_GETPOLICY)
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyFlush will flush the policies on the system.
|
||
|
|
// Equivalent to: `ip xfrm policy flush`
|
||
|
|
func XfrmPolicyFlush() error {
|
||
|
|
return pkgHandle.XfrmPolicyFlush()
|
||
|
|
}
|
||
|
|
|
||
|
|
// XfrmPolicyFlush will flush the policies on the system.
|
||
|
|
// Equivalent to: `ip xfrm policy flush`
|
||
|
|
func (h *Handle) XfrmPolicyFlush() error {
|
||
|
|
req := h.newNetlinkRequest(nl.XFRM_MSG_FLUSHPOLICY, unix.NLM_F_ACK)
|
||
|
|
_, err := req.Execute(unix.NETLINK_XFRM, 0)
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
func (h *Handle) xfrmPolicyGetOrDelete(policy *XfrmPolicy, nlProto int) (*XfrmPolicy, error) {
|
||
|
|
req := h.newNetlinkRequest(nlProto, unix.NLM_F_ACK)
|
||
|
|
|
||
|
|
msg := &nl.XfrmUserpolicyId{}
|
||
|
|
selFromPolicy(&msg.Sel, policy)
|
||
|
|
msg.Index = uint32(policy.Index)
|
||
|
|
msg.Dir = uint8(policy.Dir)
|
||
|
|
req.AddData(msg)
|
||
|
|
|
||
|
|
if policy.Mark != nil {
|
||
|
|
out := nl.NewRtAttr(nl.XFRMA_MARK, writeMark(policy.Mark))
|
||
|
|
req.AddData(out)
|
||
|
|
}
|
||
|
|
|
||
|
|
ifId := nl.NewRtAttr(nl.XFRMA_IF_ID, nl.Uint32Attr(uint32(policy.Ifid)))
|
||
|
|
req.AddData(ifId)
|
||
|
|
|
||
|
|
resType := nl.XFRM_MSG_NEWPOLICY
|
||
|
|
if nlProto == nl.XFRM_MSG_DELPOLICY {
|
||
|
|
resType = 0
|
||
|
|
}
|
||
|
|
|
||
|
|
msgs, err := req.Execute(unix.NETLINK_XFRM, uint16(resType))
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if nlProto == nl.XFRM_MSG_DELPOLICY {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return parseXfrmPolicy(msgs[0], FAMILY_ALL)
|
||
|
|
}
|
||
|
|
|
||
|
|
func parseXfrmPolicy(m []byte, family int) (*XfrmPolicy, error) {
|
||
|
|
msg := nl.DeserializeXfrmUserpolicyInfo(m)
|
||
|
|
|
||
|
|
// This is mainly for the policy dump
|
||
|
|
if family != FAMILY_ALL && family != int(msg.Sel.Family) {
|
||
|
|
return nil, familyError
|
||
|
|
}
|
||
|
|
|
||
|
|
var policy XfrmPolicy
|
||
|
|
|
||
|
|
policy.Dst = msg.Sel.Daddr.ToIPNet(msg.Sel.PrefixlenD)
|
||
|
|
policy.Src = msg.Sel.Saddr.ToIPNet(msg.Sel.PrefixlenS)
|
||
|
|
policy.Proto = Proto(msg.Sel.Proto)
|
||
|
|
policy.DstPort = int(nl.Swap16(msg.Sel.Dport))
|
||
|
|
policy.SrcPort = int(nl.Swap16(msg.Sel.Sport))
|
||
|
|
policy.Ifindex = int(msg.Sel.Ifindex)
|
||
|
|
policy.Priority = int(msg.Priority)
|
||
|
|
policy.Index = int(msg.Index)
|
||
|
|
policy.Dir = Dir(msg.Dir)
|
||
|
|
policy.Action = PolicyAction(msg.Action)
|
||
|
|
|
||
|
|
attrs, err := nl.ParseRouteAttr(m[msg.Len():])
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
for _, attr := range attrs {
|
||
|
|
switch attr.Attr.Type {
|
||
|
|
case nl.XFRMA_TMPL:
|
||
|
|
max := len(attr.Value)
|
||
|
|
for i := 0; i < max; i += nl.SizeofXfrmUserTmpl {
|
||
|
|
var resTmpl XfrmPolicyTmpl
|
||
|
|
tmpl := nl.DeserializeXfrmUserTmpl(attr.Value[i : i+nl.SizeofXfrmUserTmpl])
|
||
|
|
resTmpl.Dst = tmpl.XfrmId.Daddr.ToIP()
|
||
|
|
resTmpl.Src = tmpl.Saddr.ToIP()
|
||
|
|
resTmpl.Proto = Proto(tmpl.XfrmId.Proto)
|
||
|
|
resTmpl.Mode = Mode(tmpl.Mode)
|
||
|
|
resTmpl.Spi = int(nl.Swap32(tmpl.XfrmId.Spi))
|
||
|
|
resTmpl.Reqid = int(tmpl.Reqid)
|
||
|
|
policy.Tmpls = append(policy.Tmpls, resTmpl)
|
||
|
|
}
|
||
|
|
case nl.XFRMA_MARK:
|
||
|
|
mark := nl.DeserializeXfrmMark(attr.Value[:])
|
||
|
|
policy.Mark = new(XfrmMark)
|
||
|
|
policy.Mark.Value = mark.Value
|
||
|
|
policy.Mark.Mask = mark.Mask
|
||
|
|
case nl.XFRMA_IF_ID:
|
||
|
|
policy.Ifid = int(native.Uint32(attr.Value))
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return &policy, nil
|
||
|
|
}
|