// XfrmPolicyAdd will add an xfrm policy to the system.
// Equivalent to: `ip xfrm policy add $policy`
func XfrmPolicyAdd(policy *XfrmPolicy) error {
req := nl.NewNetlinkRequest(nl.XFRM_MSG_NEWPOLICY, syscall.NLM_F_CREATE|syscall.NLM_F_EXCL|syscall.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.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.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)
}
_, err := req.Execute(syscall.NETLINK_XFRM, 0)
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) {
req := nl.NewNetlinkRequest(nl.XFRM_MSG_GETPOLICY, syscall.NLM_F_DUMP)
msg := nl.NewIfInfomsg(family)
req.AddData(msg)
msgs, err := req.Execute(syscall.NETLINK_XFRM, nl.XFRM_MSG_NEWPOLICY)
if err != nil {
return nil, err
}
var res []XfrmPolicy
for _, m := range msgs {
msg := nl.DeserializeXfrmUserpolicyInfo(m)
if family != FAMILY_ALL && family != int(msg.Sel.Family) {
continue
}
var policy XfrmPolicy
policy.Dst = msg.Sel.Daddr.ToIPNet(msg.Sel.PrefixlenD)
policy.Src = msg.Sel.Saddr.ToIPNet(msg.Sel.PrefixlenS)
policy.Priority = int(msg.Priority)
policy.Index = int(msg.Index)
policy.Dir = Dir(msg.Dir)
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.Reqid = int(tmpl.Reqid)
policy.Tmpls = append(policy.Tmpls, resTmpl)
}
}
}
res = append(res, policy)
}
return res, nil
}
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.Priority = int(msg.Priority)
policy.Index = int(msg.Index)
policy.Dir = Dir(msg.Dir)
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
}
}
return &policy, nil
}