mirror of https://github.com/vishvananda/netlink
128 lines
3.6 KiB
Go
128 lines
3.6 KiB
Go
package netlink
|
|
|
|
import (
|
|
"syscall"
|
|
|
|
"github.com/vishvananda/netlink/nl"
|
|
)
|
|
|
|
func selFromPolicy(sel *nl.XfrmSelector, policy *XfrmPolicy) {
|
|
sel.Family = uint16(nl.GetIPFamily(policy.Dst.IP))
|
|
sel.Daddr.FromIP(policy.Dst.IP)
|
|
sel.Saddr.FromIP(policy.Src.IP)
|
|
prefixlenD, _ := policy.Dst.Mask.Size()
|
|
sel.PrefixlenD = uint8(prefixlenD)
|
|
prefixlenS, _ := policy.Src.Mask.Size()
|
|
sel.PrefixlenS = uint8(prefixlenS)
|
|
}
|
|
|
|
// 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
|
|
}
|
|
|
|
// 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 {
|
|
req := nl.NewNetlinkRequest(nl.XFRM_MSG_DELPOLICY, syscall.NLM_F_ACK)
|
|
|
|
msg := &nl.XfrmUserpolicyId{}
|
|
selFromPolicy(&msg.Sel, policy)
|
|
msg.Index = uint32(policy.Index)
|
|
msg.Dir = uint8(policy.Dir)
|
|
req.AddData(msg)
|
|
|
|
_, 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
|
|
}
|
|
|
|
res := make([]XfrmPolicy, 0)
|
|
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
|
|
}
|