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route_linux.go
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route_linux.go
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package netlink
import (
"bytes"
"encoding/binary"
"fmt"
"net"
"strconv"
"strings"
"syscall"
"github.com/vishvananda/netlink/nl"
"github.com/vishvananda/netns"
"golang.org/x/sys/unix"
)
// RtAttr is shared so it is in netlink_linux.go
const (
SCOPE_UNIVERSE Scope = unix.RT_SCOPE_UNIVERSE
SCOPE_SITE Scope = unix.RT_SCOPE_SITE
SCOPE_LINK Scope = unix.RT_SCOPE_LINK
SCOPE_HOST Scope = unix.RT_SCOPE_HOST
SCOPE_NOWHERE Scope = unix.RT_SCOPE_NOWHERE
)
func (s Scope) String() string {
switch s {
case SCOPE_UNIVERSE:
return "universe"
case SCOPE_SITE:
return "site"
case SCOPE_LINK:
return "link"
case SCOPE_HOST:
return "host"
case SCOPE_NOWHERE:
return "nowhere"
default:
return "unknown"
}
}
const (
FLAG_ONLINK NextHopFlag = unix.RTNH_F_ONLINK
FLAG_PERVASIVE NextHopFlag = unix.RTNH_F_PERVASIVE
)
var testFlags = []flagString{
{f: FLAG_ONLINK, s: "onlink"},
{f: FLAG_PERVASIVE, s: "pervasive"},
}
func listFlags(flag int) []string {
var flags []string
for _, tf := range testFlags {
if flag&int(tf.f) != 0 {
flags = append(flags, tf.s)
}
}
return flags
}
func (r *Route) ListFlags() []string {
return listFlags(r.Flags)
}
func (n *NexthopInfo) ListFlags() []string {
return listFlags(n.Flags)
}
type MPLSDestination struct {
Labels []int
}
func (d *MPLSDestination) Family() int {
return nl.FAMILY_MPLS
}
func (d *MPLSDestination) Decode(buf []byte) error {
d.Labels = nl.DecodeMPLSStack(buf)
return nil
}
func (d *MPLSDestination) Encode() ([]byte, error) {
return nl.EncodeMPLSStack(d.Labels...), nil
}
func (d *MPLSDestination) String() string {
s := make([]string, 0, len(d.Labels))
for _, l := range d.Labels {
s = append(s, fmt.Sprintf("%d", l))
}
return strings.Join(s, "/")
}
func (d *MPLSDestination) Equal(x Destination) bool {
o, ok := x.(*MPLSDestination)
if !ok {
return false
}
if d == nil && o == nil {
return true
}
if d == nil || o == nil {
return false
}
if d.Labels == nil && o.Labels == nil {
return true
}
if d.Labels == nil || o.Labels == nil {
return false
}
if len(d.Labels) != len(o.Labels) {
return false
}
for i := range d.Labels {
if d.Labels[i] != o.Labels[i] {
return false
}
}
return true
}
type MPLSEncap struct {
Labels []int
}
func (e *MPLSEncap) Type() int {
return nl.LWTUNNEL_ENCAP_MPLS
}
func (e *MPLSEncap) Decode(buf []byte) error {
if len(buf) < 4 {
return fmt.Errorf("lack of bytes")
}
l := native.Uint16(buf)
if len(buf) < int(l) {
return fmt.Errorf("lack of bytes")
}
buf = buf[:l]
typ := native.Uint16(buf[2:])
if typ != nl.MPLS_IPTUNNEL_DST {
return fmt.Errorf("unknown MPLS Encap Type: %d", typ)
}
e.Labels = nl.DecodeMPLSStack(buf[4:])
return nil
}
func (e *MPLSEncap) Encode() ([]byte, error) {
s := nl.EncodeMPLSStack(e.Labels...)
hdr := make([]byte, 4)
native.PutUint16(hdr, uint16(len(s)+4))
native.PutUint16(hdr[2:], nl.MPLS_IPTUNNEL_DST)
return append(hdr, s...), nil
}
func (e *MPLSEncap) String() string {
s := make([]string, 0, len(e.Labels))
for _, l := range e.Labels {
s = append(s, fmt.Sprintf("%d", l))
}
return strings.Join(s, "/")
}
func (e *MPLSEncap) Equal(x Encap) bool {
o, ok := x.(*MPLSEncap)
if !ok {
return false
}
if e == nil && o == nil {
return true
}
if e == nil || o == nil {
return false
}
if e.Labels == nil && o.Labels == nil {
return true
}
if e.Labels == nil || o.Labels == nil {
return false
}
if len(e.Labels) != len(o.Labels) {
return false
}
for i := range e.Labels {
if e.Labels[i] != o.Labels[i] {
return false
}
}
return true
}
// SEG6 definitions
type SEG6Encap struct {
Mode int
Segments []net.IP
}
func (e *SEG6Encap) Type() int {
return nl.LWTUNNEL_ENCAP_SEG6
}
func (e *SEG6Encap) Decode(buf []byte) error {
if len(buf) < 4 {
return fmt.Errorf("lack of bytes")
}
// Get Length(l) & Type(typ) : 2 + 2 bytes
l := native.Uint16(buf)
if len(buf) < int(l) {
return fmt.Errorf("lack of bytes")
}
buf = buf[:l] // make sure buf size upper limit is Length
typ := native.Uint16(buf[2:])
// LWTUNNEL_ENCAP_SEG6 has only one attr type SEG6_IPTUNNEL_SRH
if typ != nl.SEG6_IPTUNNEL_SRH {
return fmt.Errorf("unknown SEG6 Type: %d", typ)
}
var err error
e.Mode, e.Segments, err = nl.DecodeSEG6Encap(buf[4:])
return err
}
func (e *SEG6Encap) Encode() ([]byte, error) {
s, err := nl.EncodeSEG6Encap(e.Mode, e.Segments)
hdr := make([]byte, 4)
native.PutUint16(hdr, uint16(len(s)+4))
native.PutUint16(hdr[2:], nl.SEG6_IPTUNNEL_SRH)
return append(hdr, s...), err
}
func (e *SEG6Encap) String() string {
segs := make([]string, 0, len(e.Segments))
// append segment backwards (from n to 0) since seg#0 is the last segment.
for i := len(e.Segments); i > 0; i-- {
segs = append(segs, e.Segments[i-1].String())
}
str := fmt.Sprintf("mode %s segs %d [ %s ]", nl.SEG6EncapModeString(e.Mode),
len(e.Segments), strings.Join(segs, " "))
return str
}
func (e *SEG6Encap) Equal(x Encap) bool {
o, ok := x.(*SEG6Encap)
if !ok {
return false
}
if e == o {
return true
}
if e == nil || o == nil {
return false
}
if e.Mode != o.Mode {
return false
}
if len(e.Segments) != len(o.Segments) {
return false
}
for i := range e.Segments {
if !e.Segments[i].Equal(o.Segments[i]) {
return false
}
}
return true
}
// SEG6LocalEncap definitions
type SEG6LocalEncap struct {
Flags [nl.SEG6_LOCAL_MAX]bool
Action int
Segments []net.IP // from SRH in seg6_local_lwt
Table int // table id for End.T and End.DT6
InAddr net.IP
In6Addr net.IP
Iif int
Oif int
}
func (e *SEG6LocalEncap) Type() int {
return nl.LWTUNNEL_ENCAP_SEG6_LOCAL
}
func (e *SEG6LocalEncap) Decode(buf []byte) error {
attrs, err := nl.ParseRouteAttr(buf)
if err != nil {
return err
}
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.SEG6_LOCAL_ACTION:
e.Action = int(native.Uint32(attr.Value[0:4]))
e.Flags[nl.SEG6_LOCAL_ACTION] = true
case nl.SEG6_LOCAL_SRH:
e.Segments, err = nl.DecodeSEG6Srh(attr.Value[:])
e.Flags[nl.SEG6_LOCAL_SRH] = true
case nl.SEG6_LOCAL_TABLE:
e.Table = int(native.Uint32(attr.Value[0:4]))
e.Flags[nl.SEG6_LOCAL_TABLE] = true
case nl.SEG6_LOCAL_NH4:
e.InAddr = net.IP(attr.Value[0:4])
e.Flags[nl.SEG6_LOCAL_NH4] = true
case nl.SEG6_LOCAL_NH6:
e.In6Addr = net.IP(attr.Value[0:16])
e.Flags[nl.SEG6_LOCAL_NH6] = true
case nl.SEG6_LOCAL_IIF:
e.Iif = int(native.Uint32(attr.Value[0:4]))
e.Flags[nl.SEG6_LOCAL_IIF] = true
case nl.SEG6_LOCAL_OIF:
e.Oif = int(native.Uint32(attr.Value[0:4]))
e.Flags[nl.SEG6_LOCAL_OIF] = true
}
}
return err
}
func (e *SEG6LocalEncap) Encode() ([]byte, error) {
var err error
res := make([]byte, 8)
native.PutUint16(res, 8) // length
native.PutUint16(res[2:], nl.SEG6_LOCAL_ACTION)
native.PutUint32(res[4:], uint32(e.Action))
if e.Flags[nl.SEG6_LOCAL_SRH] {
srh, err := nl.EncodeSEG6Srh(e.Segments)
if err != nil {
return nil, err
}
attr := make([]byte, 4)
native.PutUint16(attr, uint16(len(srh)+4))
native.PutUint16(attr[2:], nl.SEG6_LOCAL_SRH)
attr = append(attr, srh...)
res = append(res, attr...)
}
if e.Flags[nl.SEG6_LOCAL_TABLE] {
attr := make([]byte, 8)
native.PutUint16(attr, 8)
native.PutUint16(attr[2:], nl.SEG6_LOCAL_TABLE)
native.PutUint32(attr[4:], uint32(e.Table))
res = append(res, attr...)
}
if e.Flags[nl.SEG6_LOCAL_NH4] {
attr := make([]byte, 4)
native.PutUint16(attr, 8)
native.PutUint16(attr[2:], nl.SEG6_LOCAL_NH4)
ipv4 := e.InAddr.To4()
if ipv4 == nil {
err = fmt.Errorf("SEG6_LOCAL_NH4 has invalid IPv4 address")
return nil, err
}
attr = append(attr, ipv4...)
res = append(res, attr...)
}
if e.Flags[nl.SEG6_LOCAL_NH6] {
attr := make([]byte, 4)
native.PutUint16(attr, 20)
native.PutUint16(attr[2:], nl.SEG6_LOCAL_NH6)
attr = append(attr, e.In6Addr...)
res = append(res, attr...)
}
if e.Flags[nl.SEG6_LOCAL_IIF] {
attr := make([]byte, 8)
native.PutUint16(attr, 8)
native.PutUint16(attr[2:], nl.SEG6_LOCAL_IIF)
native.PutUint32(attr[4:], uint32(e.Iif))
res = append(res, attr...)
}
if e.Flags[nl.SEG6_LOCAL_OIF] {
attr := make([]byte, 8)
native.PutUint16(attr, 8)
native.PutUint16(attr[2:], nl.SEG6_LOCAL_OIF)
native.PutUint32(attr[4:], uint32(e.Oif))
res = append(res, attr...)
}
return res, err
}
func (e *SEG6LocalEncap) String() string {
strs := make([]string, 0, nl.SEG6_LOCAL_MAX)
strs = append(strs, fmt.Sprintf("action %s", nl.SEG6LocalActionString(e.Action)))
if e.Flags[nl.SEG6_LOCAL_TABLE] {
strs = append(strs, fmt.Sprintf("table %d", e.Table))
}
if e.Flags[nl.SEG6_LOCAL_NH4] {
strs = append(strs, fmt.Sprintf("nh4 %s", e.InAddr))
}
if e.Flags[nl.SEG6_LOCAL_NH6] {
strs = append(strs, fmt.Sprintf("nh6 %s", e.In6Addr))
}
if e.Flags[nl.SEG6_LOCAL_IIF] {
link, err := LinkByIndex(e.Iif)
if err != nil {
strs = append(strs, fmt.Sprintf("iif %d", e.Iif))
} else {
strs = append(strs, fmt.Sprintf("iif %s", link.Attrs().Name))
}
}
if e.Flags[nl.SEG6_LOCAL_OIF] {
link, err := LinkByIndex(e.Oif)
if err != nil {
strs = append(strs, fmt.Sprintf("oif %d", e.Oif))
} else {
strs = append(strs, fmt.Sprintf("oif %s", link.Attrs().Name))
}
}
if e.Flags[nl.SEG6_LOCAL_SRH] {
segs := make([]string, 0, len(e.Segments))
//append segment backwards (from n to 0) since seg#0 is the last segment.
for i := len(e.Segments); i > 0; i-- {
segs = append(segs, e.Segments[i-1].String())
}
strs = append(strs, fmt.Sprintf("segs %d [ %s ]", len(e.Segments), strings.Join(segs, " ")))
}
return strings.Join(strs, " ")
}
func (e *SEG6LocalEncap) Equal(x Encap) bool {
o, ok := x.(*SEG6LocalEncap)
if !ok {
return false
}
if e == o {
return true
}
if e == nil || o == nil {
return false
}
// compare all arrays first
for i := range e.Flags {
if e.Flags[i] != o.Flags[i] {
return false
}
}
if len(e.Segments) != len(o.Segments) {
return false
}
for i := range e.Segments {
if !e.Segments[i].Equal(o.Segments[i]) {
return false
}
}
// compare values
if !e.InAddr.Equal(o.InAddr) || !e.In6Addr.Equal(o.In6Addr) {
return false
}
if e.Action != o.Action || e.Table != o.Table || e.Iif != o.Iif || e.Oif != o.Oif {
return false
}
return true
}
// Encap BPF definitions
type bpfObj struct {
progFd int
progName string
}
type BpfEncap struct {
progs [nl.LWT_BPF_MAX]bpfObj
headroom int
}
// SetProg adds a bpf function to the route via netlink RTA_ENCAP. The fd must be a bpf
// program loaded with bpf(type=BPF_PROG_TYPE_LWT_*) matching the direction the program should
// be applied to (LWT_BPF_IN, LWT_BPF_OUT, LWT_BPF_XMIT).
func (e *BpfEncap) SetProg(mode, progFd int, progName string) error {
if progFd <= 0 {
return fmt.Errorf("lwt bpf SetProg: invalid fd")
}
if mode <= nl.LWT_BPF_UNSPEC || mode >= nl.LWT_BPF_XMIT_HEADROOM {
return fmt.Errorf("lwt bpf SetProg:invalid mode")
}
e.progs[mode].progFd = progFd
e.progs[mode].progName = fmt.Sprintf("%s[fd:%d]", progName, progFd)
return nil
}
// SetXmitHeadroom sets the xmit headroom (LWT_BPF_MAX_HEADROOM) via netlink RTA_ENCAP.
// maximum headroom is LWT_BPF_MAX_HEADROOM
func (e *BpfEncap) SetXmitHeadroom(headroom int) error {
if headroom > nl.LWT_BPF_MAX_HEADROOM || headroom < 0 {
return fmt.Errorf("invalid headroom size. range is 0 - %d", nl.LWT_BPF_MAX_HEADROOM)
}
e.headroom = headroom
return nil
}
func (e *BpfEncap) Type() int {
return nl.LWTUNNEL_ENCAP_BPF
}
func (e *BpfEncap) Decode(buf []byte) error {
if len(buf) < 4 {
return fmt.Errorf("lwt bpf decode: lack of bytes")
}
native := nl.NativeEndian()
attrs, err := nl.ParseRouteAttr(buf)
if err != nil {
return fmt.Errorf("lwt bpf decode: failed parsing attribute. err: %v", err)
}
for _, attr := range attrs {
if int(attr.Attr.Type) < 1 {
// nl.LWT_BPF_UNSPEC
continue
}
if int(attr.Attr.Type) > nl.LWT_BPF_MAX {
return fmt.Errorf("lwt bpf decode: received unknown attribute type: %d", attr.Attr.Type)
}
switch int(attr.Attr.Type) {
case nl.LWT_BPF_MAX_HEADROOM:
e.headroom = int(native.Uint32(attr.Value))
default:
bpfO := bpfObj{}
parsedAttrs, err := nl.ParseRouteAttr(attr.Value)
if err != nil {
return fmt.Errorf("lwt bpf decode: failed parsing route attribute")
}
for _, parsedAttr := range parsedAttrs {
switch int(parsedAttr.Attr.Type) {
case nl.LWT_BPF_PROG_FD:
bpfO.progFd = int(native.Uint32(parsedAttr.Value))
case nl.LWT_BPF_PROG_NAME:
bpfO.progName = string(parsedAttr.Value)
default:
return fmt.Errorf("lwt bpf decode: received unknown attribute: type: %d, len: %d", parsedAttr.Attr.Type, parsedAttr.Attr.Len)
}
}
e.progs[attr.Attr.Type] = bpfO
}
}
return nil
}
func (e *BpfEncap) Encode() ([]byte, error) {
buf := make([]byte, 0)
native = nl.NativeEndian()
for index, attr := range e.progs {
nlMsg := nl.NewRtAttr(index, []byte{})
if attr.progFd != 0 {
nlMsg.AddRtAttr(nl.LWT_BPF_PROG_FD, nl.Uint32Attr(uint32(attr.progFd)))
}
if attr.progName != "" {
nlMsg.AddRtAttr(nl.LWT_BPF_PROG_NAME, nl.ZeroTerminated(attr.progName))
}
if nlMsg.Len() > 4 {
buf = append(buf, nlMsg.Serialize()...)
}
}
if len(buf) <= 4 {
return nil, fmt.Errorf("lwt bpf encode: bpf obj definitions returned empty buffer")
}
if e.headroom > 0 {
hRoom := nl.NewRtAttr(nl.LWT_BPF_XMIT_HEADROOM, nl.Uint32Attr(uint32(e.headroom)))
buf = append(buf, hRoom.Serialize()...)
}
return buf, nil
}
func (e *BpfEncap) String() string {
progs := make([]string, 0)
for index, obj := range e.progs {
empty := bpfObj{}
switch index {
case nl.LWT_BPF_IN:
if obj != empty {
progs = append(progs, fmt.Sprintf("in: %s", obj.progName))
}
case nl.LWT_BPF_OUT:
if obj != empty {
progs = append(progs, fmt.Sprintf("out: %s", obj.progName))
}
case nl.LWT_BPF_XMIT:
if obj != empty {
progs = append(progs, fmt.Sprintf("xmit: %s", obj.progName))
}
}
}
if e.headroom > 0 {
progs = append(progs, fmt.Sprintf("xmit headroom: %d", e.headroom))
}
return strings.Join(progs, " ")
}
func (e *BpfEncap) Equal(x Encap) bool {
o, ok := x.(*BpfEncap)
if !ok {
return false
}
if e.headroom != o.headroom {
return false
}
for i := range o.progs {
if o.progs[i] != e.progs[i] {
return false
}
}
return true
}
// IP6tnlEncap definition
type IP6tnlEncap struct {
ID uint64
Dst net.IP
Src net.IP
Hoplimit uint8
TC uint8
Flags uint16
}
func (e *IP6tnlEncap) Type() int {
return nl.LWTUNNEL_ENCAP_IP6
}
func (e *IP6tnlEncap) Decode(buf []byte) error {
attrs, err := nl.ParseRouteAttr(buf)
if err != nil {
return err
}
for _, attr := range attrs {
switch attr.Attr.Type {
case nl.LWTUNNEL_IP6_ID:
e.ID = uint64(native.Uint64(attr.Value[0:4]))
case nl.LWTUNNEL_IP6_DST:
e.Dst = net.IP(attr.Value[:])
case nl.LWTUNNEL_IP6_SRC:
e.Src = net.IP(attr.Value[:])
case nl.LWTUNNEL_IP6_HOPLIMIT:
e.Hoplimit = attr.Value[0]
case nl.LWTUNNEL_IP6_TC:
// e.TC = attr.Value[0]
err = fmt.Errorf("decoding TC in IP6tnlEncap is not supported")
case nl.LWTUNNEL_IP6_FLAGS:
// e.Flags = uint16(native.Uint16(attr.Value[0:2]))
err = fmt.Errorf("decoding FLAG in IP6tnlEncap is not supported")
case nl.LWTUNNEL_IP6_PAD:
err = fmt.Errorf("decoding PAD in IP6tnlEncap is not supported")
case nl.LWTUNNEL_IP6_OPTS:
err = fmt.Errorf("decoding OPTS in IP6tnlEncap is not supported")
}
}
return err
}
func (e *IP6tnlEncap) Encode() ([]byte, error) {
final := []byte{}
resID := make([]byte, 12)
native.PutUint16(resID, 12) // 2+2+8
native.PutUint16(resID[2:], nl.LWTUNNEL_IP6_ID)
native.PutUint64(resID[4:], 0)
final = append(final, resID...)
resDst := make([]byte, 4)
native.PutUint16(resDst, 20) // 2+2+16
native.PutUint16(resDst[2:], nl.LWTUNNEL_IP6_DST)
resDst = append(resDst, e.Dst...)
final = append(final, resDst...)
resSrc := make([]byte, 4)
native.PutUint16(resSrc, 20)
native.PutUint16(resSrc[2:], nl.LWTUNNEL_IP6_SRC)
resSrc = append(resSrc, e.Src...)
final = append(final, resSrc...)
// resTc := make([]byte, 5)
// native.PutUint16(resTc, 5)
// native.PutUint16(resTc[2:], nl.LWTUNNEL_IP6_TC)
// resTc[4] = e.TC
// final = append(final,resTc...)
resHops := make([]byte, 5)
native.PutUint16(resHops, 5)
native.PutUint16(resHops[2:], nl.LWTUNNEL_IP6_HOPLIMIT)
resHops[4] = e.Hoplimit
final = append(final, resHops...)
// resFlags := make([]byte, 6)
// native.PutUint16(resFlags, 6)
// native.PutUint16(resFlags[2:], nl.LWTUNNEL_IP6_FLAGS)
// native.PutUint16(resFlags[4:], e.Flags)
// final = append(final,resFlags...)
return final, nil
}
func (e *IP6tnlEncap) String() string {
return fmt.Sprintf("id %d src %s dst %s hoplimit %d tc %d flags 0x%.4x", e.ID, e.Src, e.Dst, e.Hoplimit, e.TC, e.Flags)
}
func (e *IP6tnlEncap) Equal(x Encap) bool {
o, ok := x.(*IP6tnlEncap)
if !ok {
return false
}
if e.ID != o.ID || e.Flags != o.Flags || e.Hoplimit != o.Hoplimit || e.Src.Equal(o.Src) || e.Dst.Equal(o.Dst) || e.TC != o.TC {
return false
}
return true
}
type Via struct {
AddrFamily int
Addr net.IP
}
func (v *Via) Equal(x Destination) bool {
o, ok := x.(*Via)
if !ok {
return false
}
if v.AddrFamily == x.Family() && v.Addr.Equal(o.Addr) {
return true
}
return false
}
func (v *Via) String() string {
return fmt.Sprintf("Family: %d, Address: %s", v.AddrFamily, v.Addr.String())
}
func (v *Via) Family() int {
return v.AddrFamily
}
func (v *Via) Encode() ([]byte, error) {
buf := &bytes.Buffer{}
err := binary.Write(buf, native, uint16(v.AddrFamily))
if err != nil {
return nil, err
}
err = binary.Write(buf, native, v.Addr)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (v *Via) Decode(b []byte) error {
if len(b) < 6 {
return fmt.Errorf("decoding failed: buffer too small (%d bytes)", len(b))
}
v.AddrFamily = int(native.Uint16(b[0:2]))
if v.AddrFamily == nl.FAMILY_V4 {
v.Addr = net.IP(b[2:6])
return nil
} else if v.AddrFamily == nl.FAMILY_V6 {
if len(b) < 18 {
return fmt.Errorf("decoding failed: buffer too small (%d bytes)", len(b))
}
v.Addr = net.IP(b[2:])
return nil
}
return fmt.Errorf("decoding failed: address family %d unknown", v.AddrFamily)
}
// RouteAdd will add a route to the system.
// Equivalent to: `ip route add $route`
func RouteAdd(route *Route) error {
return pkgHandle.RouteAdd(route)
}
// RouteAdd will add a route to the system.
// Equivalent to: `ip route add $route`
func (h *Handle) RouteAdd(route *Route) error {
flags := unix.NLM_F_CREATE | unix.NLM_F_EXCL | unix.NLM_F_ACK
req := h.newNetlinkRequest(unix.RTM_NEWROUTE, flags)
_, err := h.routeHandle(route, req, nl.NewRtMsg())
return err
}
// RouteAppend will append a route to the system.
// Equivalent to: `ip route append $route`
func RouteAppend(route *Route) error {
return pkgHandle.RouteAppend(route)
}
// RouteAppend will append a route to the system.
// Equivalent to: `ip route append $route`
func (h *Handle) RouteAppend(route *Route) error {
flags := unix.NLM_F_CREATE | unix.NLM_F_APPEND | unix.NLM_F_ACK
req := h.newNetlinkRequest(unix.RTM_NEWROUTE, flags)
_, err := h.routeHandle(route, req, nl.NewRtMsg())
return err
}
// RouteAddEcmp will add a route to the system.
func RouteAddEcmp(route *Route) error {
return pkgHandle.RouteAddEcmp(route)
}
// RouteAddEcmp will add a route to the system.
func (h *Handle) RouteAddEcmp(route *Route) error {
flags := unix.NLM_F_CREATE | unix.NLM_F_ACK
req := h.newNetlinkRequest(unix.RTM_NEWROUTE, flags)
_, err := h.routeHandle(route, req, nl.NewRtMsg())
return err
}
// RouteChange will change an existing route in the system.
// Equivalent to: `ip route change $route`
func RouteChange(route *Route) error {
return pkgHandle.RouteChange(route)
}
// RouteChange will change an existing route in the system.
// Equivalent to: `ip route change $route`
func (h *Handle) RouteChange(route *Route) error {
flags := unix.NLM_F_REPLACE | unix.NLM_F_ACK
req := h.newNetlinkRequest(unix.RTM_NEWROUTE, flags)
_, err := h.routeHandle(route, req, nl.NewRtMsg())
return err
}
// RouteReplace will add a route to the system.
// Equivalent to: `ip route replace $route`
func RouteReplace(route *Route) error {
return pkgHandle.RouteReplace(route)
}
// RouteReplace will add a route to the system.
// Equivalent to: `ip route replace $route`
func (h *Handle) RouteReplace(route *Route) error {
flags := unix.NLM_F_CREATE | unix.NLM_F_REPLACE | unix.NLM_F_ACK
req := h.newNetlinkRequest(unix.RTM_NEWROUTE, flags)
_, err := h.routeHandle(route, req, nl.NewRtMsg())
return err
}
// RouteDel will delete a route from the system.
// Equivalent to: `ip route del $route`
func RouteDel(route *Route) error {
return pkgHandle.RouteDel(route)
}
// RouteDel will delete a route from the system.
// Equivalent to: `ip route del $route`
func (h *Handle) RouteDel(route *Route) error {
req := h.newNetlinkRequest(unix.RTM_DELROUTE, unix.NLM_F_ACK)
_, err := h.routeHandle(route, req, nl.NewRtDelMsg())
return err
}
func (h *Handle) routeHandle(route *Route, req *nl.NetlinkRequest, msg *nl.RtMsg) ([][]byte, error) {
if req.NlMsghdr.Type != unix.RTM_GETROUTE && (route.Dst == nil || route.Dst.IP == nil) && route.Src == nil && route.Gw == nil && route.MPLSDst == nil {
return nil, fmt.Errorf("Either Dst.IP, Src.IP or Gw must be set")
}
family := -1
var rtAttrs []*nl.RtAttr
if route.Dst != nil && route.Dst.IP != nil {
dstLen, _ := route.Dst.Mask.Size()
msg.Dst_len = uint8(dstLen)
dstFamily := nl.GetIPFamily(route.Dst.IP)
family = dstFamily
var dstData []byte
if dstFamily == FAMILY_V4 {
dstData = route.Dst.IP.To4()
} else {
dstData = route.Dst.IP.To16()
}
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_DST, dstData))
} else if route.MPLSDst != nil {
family = nl.FAMILY_MPLS
msg.Dst_len = uint8(20)
msg.Type = unix.RTN_UNICAST
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_DST, nl.EncodeMPLSStack(*route.MPLSDst)))
}
if route.NewDst != nil {
if family != -1 && family != route.NewDst.Family() {
return nil, fmt.Errorf("new destination and destination are not the same address family")
}
buf, err := route.NewDst.Encode()
if err != nil {
return nil, err
}
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_NEWDST, buf))
}
if route.Encap != nil {
buf := make([]byte, 2)
native.PutUint16(buf, uint16(route.Encap.Type()))
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_ENCAP_TYPE, buf))
buf, err := route.Encap.Encode()
if err != nil {
return nil, err
}
switch route.Encap.Type() {
case nl.LWTUNNEL_ENCAP_BPF:
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_ENCAP|unix.NLA_F_NESTED, buf))
default:
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_ENCAP, buf))
}
}
if route.Src != nil {
srcFamily := nl.GetIPFamily(route.Src)
if family != -1 && family != srcFamily {
return nil, fmt.Errorf("source and destination ip are not the same IP family")
}
family = srcFamily
var srcData []byte
if srcFamily == FAMILY_V4 {
srcData = route.Src.To4()
} else {
srcData = route.Src.To16()
}
// The commonly used src ip for routes is actually PREFSRC
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_PREFSRC, srcData))
}
if route.Gw != nil {
gwFamily := nl.GetIPFamily(route.Gw)
if family != -1 && family != gwFamily {
return nil, fmt.Errorf("gateway, source, and destination ip are not the same IP family")
}
family = gwFamily
var gwData []byte
if gwFamily == FAMILY_V4 {
gwData = route.Gw.To4()
} else {
gwData = route.Gw.To16()
}
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_GATEWAY, gwData))
}
if route.Via != nil {
buf, err := route.Via.Encode()
if err != nil {
return nil, fmt.Errorf("failed to encode RTA_VIA: %v", err)
}
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_VIA, buf))
}
if len(route.MultiPath) > 0 {
buf := []byte{}
for _, nh := range route.MultiPath {
rtnh := &nl.RtNexthop{
RtNexthop: unix.RtNexthop{
Hops: uint8(nh.Hops),
Ifindex: int32(nh.LinkIndex),
Flags: uint8(nh.Flags),
},
}
children := []nl.NetlinkRequestData{}
if nh.Gw != nil {
gwFamily := nl.GetIPFamily(nh.Gw)
if family != -1 && family != gwFamily {
return nil, fmt.Errorf("gateway, source, and destination ip are not the same IP family")
}
if gwFamily == FAMILY_V4 {
children = append(children, nl.NewRtAttr(unix.RTA_GATEWAY, []byte(nh.Gw.To4())))
} else {
children = append(children, nl.NewRtAttr(unix.RTA_GATEWAY, []byte(nh.Gw.To16())))
}
}
if nh.NewDst != nil {
if family != -1 && family != nh.NewDst.Family() {
return nil, fmt.Errorf("new destination and destination are not the same address family")
}
buf, err := nh.NewDst.Encode()
if err != nil {
return nil, err
}
children = append(children, nl.NewRtAttr(unix.RTA_NEWDST, buf))
}
if nh.Encap != nil {
buf := make([]byte, 2)
native.PutUint16(buf, uint16(nh.Encap.Type()))
children = append(children, nl.NewRtAttr(unix.RTA_ENCAP_TYPE, buf))
buf, err := nh.Encap.Encode()
if err != nil {
return nil, err
}
children = append(children, nl.NewRtAttr(unix.RTA_ENCAP, buf))
}
if nh.Via != nil {
buf, err := nh.Via.Encode()
if err != nil {
return nil, err
}
children = append(children, nl.NewRtAttr(unix.RTA_VIA, buf))
}
rtnh.Children = children
buf = append(buf, rtnh.Serialize()...)
}
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_MULTIPATH, buf))
}
if route.Table > 0 {
if route.Table >= 256 {
msg.Table = unix.RT_TABLE_UNSPEC
b := make([]byte, 4)
native.PutUint32(b, uint32(route.Table))
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_TABLE, b))
} else {
msg.Table = uint8(route.Table)
}
}
if route.Priority > 0 {
b := make([]byte, 4)
native.PutUint32(b, uint32(route.Priority))
rtAttrs = append(rtAttrs, nl.NewRtAttr(unix.RTA_PRIORITY, b))