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xeth.go
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xeth.go
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// Copyright © 2018-2020 Platina Systems, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This package provides a sideband control interface to an XETH driver.
// Usage,
// task, err := xeth.Start(dev)
// if err {
// panic(err)
// }
// task.DumpIfInfo()
// for t = true; t; {
// select {
// case <-goes.Stop:
// return
// case buf := <-task.RxCh:
// if t = xeth.Class(buf) != xeth.ClassBreak; t {
// msg := xeth.Parse(buf)
// ...
// xeth.Pool(msg)
// }
// }
// }
// ...
// task.DumpFib()
// for t := true; t; {
// select {
// case <-goes.Stop:
// return
// case buf := <-task.RxCh:
// if t = xeth.Class(buf) != xeth.ClassBreak; t {
// msg := xeth.Parse(buf)
// ...
// xeth.Pool(msg)
// }
// }
// }
// ...
// goes.WG.Add(1)
// go func() {
// defer goes.WG.Done()
// for {
// select {
// case <-goes.Stop:
// return
// case buf := <-task.RxCh:
// msg := xeth.Parse(buf)
// ...
// xeth.Pool(msg)
// }
// }
// }()
// ...
package xeth
import (
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"path/filepath"
"syscall"
"time"
"unsafe"
"github.com/platinasystems/goes"
"github.com/platinasystems/goes/external/xeth/internal"
)
//go:generate sh -c "go tool cgo -godefs godefs.go > godefed.go"
//go:generate sh -c "go tool cgo -godefs internal/godefs.go > internal/godefed.go"
const unixpacket = "unixpacket"
const (
ClassUnknown = iota
ClassBreak
ClassInterface
ClassAddress
ClassFib
ClassNeighbor
ClassNetNs
)
const (
VLAN_PRIO_MASK = 0xe000
VLAN_PRIO_SHIFT = 13
VLAN_CFI_MASK = 0x1000
VLAN_TAG_PRESENT = VLAN_CFI_MASK
)
type pooler interface {
Pool()
}
type Break struct{}
type Buffer interface{ buffer }
var (
Cloned Counter // cloned received messages
Parsed Counter // messages parsed by user
Dropped Counter // messages that overflowed transmit channel
Sent Counter // messages and exception frames sent to driver
Unknown Counter // LinkOf xid w/o IfInfo
)
type Task struct {
RxCh <-chan Buffer // cloned msgs received from driver
sock *net.UnixConn
loch chan<- buffer // low priority, leaky-bucket tx channel
hich chan<- buffer // high priority, unbuffered, no-drop tx channel
RxErr error // error that stopped the rx service
TxErr error // error that stopped the tx service
fd int
fda syscall.SockaddrLinklayer
}
// Write provision value to platform device sysfs file
func Provision(dev, val string) error {
if len(val) == 0 {
// have to write something to get sysfs store handler to run
// which will then open the atsock
val = " "
}
sysfsdir := filepath.Join("/sys/bus/platform/devices", dev)
_, err := os.Stat(sysfsdir)
if err != nil {
return err
}
sysfsdir, err = filepath.EvalSymlinks(sysfsdir)
if err != nil {
return err
}
provision := filepath.Join(sysfsdir, "provision")
err = ioutil.WriteFile(provision, []byte(val), 0644)
if errors.Is(err, syscall.EBUSY) {
fmt.Fprintln(os.Stderr, "ignoring provision until xeth reload")
err = nil
}
return err
}
// Connect socket and run channel service routines.
func Start(dev string) (task *Task, err error) {
muxif, err := net.InterfaceByName(dev)
if err != nil {
return
}
atsockaddr, err := net.ResolveUnixAddr(unixpacket, "@"+dev)
if err != nil {
return
}
muxfd, err := syscall.Socket(syscall.AF_PACKET, syscall.SOCK_RAW,
syscall.ETH_P_ALL)
if err != nil {
return
}
atsock, err := func(a *net.UnixAddr) (*net.UnixConn, error) {
t := time.NewTicker(100 * time.Millisecond)
defer t.Stop()
for {
s, err := net.DialUnix(unixpacket, nil, atsockaddr)
if err == nil {
return s, nil
} else if !isEAGAIN(err) &&
!errors.Is(err, syscall.ECONNREFUSED) {
return nil, err
}
select {
case <-goes.Stop:
return nil, io.EOF
case <-t.C:
}
}
}(atsockaddr)
loch := make(chan buffer, 4)
hich := make(chan buffer, 4)
rxch := make(chan Buffer, 1024)
task = &Task{
RxCh: rxch,
sock: atsock,
loch: loch,
hich: hich,
fd: muxfd,
fda: syscall.SockaddrLinklayer{
Protocol: syscall.ETH_P_ARP,
Ifindex: muxif.Index,
Hatype: syscall.ARPHRD_ETHER,
},
}
goes.WG.Add(3)
go task.goRx(rxch)
go task.goTx(loch, hich)
go task.goClose()
return
}
func kind(buf buffer) uint8 {
return (*internal.MsgHeader)(buf.pointer()).Kind
}
func Class(buf Buffer) int {
switch kind(buf) {
case internal.MsgKindBreak:
return ClassBreak
case internal.MsgKindChangeUpperXid,
internal.MsgKindEthtoolFlags,
internal.MsgKindEthtoolLinkModesSupported,
internal.MsgKindEthtoolLinkModesAdvertising,
internal.MsgKindEthtoolLinkModesLPAdvertising,
internal.MsgKindEthtoolSettings,
internal.MsgKindIfInfo:
return ClassInterface
case internal.MsgKindIfa, internal.MsgKindIfa6:
return ClassAddress
case internal.MsgKindFibEntry, internal.MsgKindFib6Entry:
return ClassFib
case internal.MsgKindNeighUpdate:
return ClassNeighbor
case internal.MsgKindNetNsAdd, internal.MsgKindNetNsDel:
return ClassNetNs
default:
return ClassUnknown
}
}
// parse driver message and cache ifinfo in xid maps.
func Parse(buf Buffer) interface{} {
defer Parsed.Inc()
defer buf.pool()
switch k := kind(buf); k {
case internal.MsgKindBreak:
return Break{}
case internal.MsgKindChangeUpperXid:
msg := (*internal.MsgChangeUpperXid)(buf.pointer())
lower := Xid(msg.Lower)
upper := Xid(msg.Upper)
if msg.Linking != 0 {
return lower.join(upper)
} else {
return lower.quit(upper)
}
case internal.MsgKindEthtoolFlags:
msg := (*internal.MsgEthtoolFlags)(buf.pointer())
return Xid(msg.Xid).RxEthtoolFlags(msg.Flags)
case internal.MsgKindEthtoolLinkModesSupported:
msg := (*internal.MsgEthtoolLinkModes)(buf.pointer())
return Xid(msg.Xid).RxSupported(msg.Modes)
case internal.MsgKindEthtoolLinkModesAdvertising:
msg := (*internal.MsgEthtoolLinkModes)(buf.pointer())
return Xid(msg.Xid).RxAdvertising(msg.Modes)
case internal.MsgKindEthtoolLinkModesLPAdvertising:
msg := (*internal.MsgEthtoolLinkModes)(buf.pointer())
return Xid(msg.Xid).RxLPAdvertising(msg.Modes)
case internal.MsgKindEthtoolSettings:
msg := (*internal.MsgEthtoolSettings)(buf.pointer())
return Xid(msg.Xid).RxEthtoolSettings(msg)
case internal.MsgKindFibEntry:
msg := (*internal.MsgFibEntry)(buf.pointer())
return fib4(msg)
case internal.MsgKindFib6Entry:
msg := (*internal.MsgFib6Entry)(buf.pointer())
return fib6(msg)
case internal.MsgKindIfa:
msg := (*internal.MsgIfa)(buf.pointer())
xid := Xid(msg.Xid)
if msg.Event == internal.IFA_ADD {
return xid.RxIP4Add(msg.Address, msg.Mask)
} else {
return xid.RxIP4Del(msg.Address, msg.Mask)
}
case internal.MsgKindIfa6:
msg := (*internal.MsgIfa6)(buf.pointer())
xid := Xid(msg.Xid)
if msg.Event == internal.IFA_ADD {
addr := []byte(msg.Address[:])
length := int(msg.Length)
return xid.RxIP6Add(addr, length)
} else {
return xid.RxIP6Del(msg.Address[:])
}
case internal.MsgKindIfInfo:
msg := (*internal.MsgIfInfo)(buf.pointer())
xid := Xid(msg.Xid)
switch msg.Reason {
case internal.IfInfoReasonNew:
return RxIfInfo(msg)
case internal.IfInfoReasonDump:
return RxIfInfo(msg)
case internal.IfInfoReasonDel:
return RxDelete(xid)
case internal.IfInfoReasonUp:
return xid.RxUp()
case internal.IfInfoReasonDown:
return xid.RxDown()
case internal.IfInfoReasonReg:
return xid.RxReg(NetNs(msg.Net), msg.Ifindex)
case internal.IfInfoReasonUnreg:
return xid.RxUnreg(msg.Ifindex)
case internal.IfInfoReasonFeatures:
return xid.RxFeatures(msg.Features)
}
case internal.MsgKindNeighUpdate:
msg := (*internal.MsgNeighUpdate)(buf.pointer())
return neighbor(msg)
case internal.MsgKindNetNsAdd:
msg := (*internal.MsgNetNs)(buf.pointer())
return NetNsAdd{NetNs(msg.Net)}
case internal.MsgKindNetNsDel:
msg := (*internal.MsgNetNs)(buf.pointer())
return NetNsDel{NetNs(msg.Net)}
}
return nil
}
func Pool(msg interface{}) {
if method, found := msg.(pooler); found {
method.Pool()
}
}
// request fib dump
func (task *Task) DumpFib() {
buf := newBuffer(internal.SizeofMsgDumpFibInfo)
msg := (*internal.MsgHeader)(buf.pointer())
msg.Set(internal.MsgKindDumpFibInfo)
task.hich <- buf
}
// request ifinfo dump
func (task *Task) DumpIfInfo() {
buf := newBuffer(internal.SizeofMsgDumpIfInfo)
msg := (*internal.MsgHeader)(buf.pointer())
msg.Set(internal.MsgKindDumpIfInfo)
task.hich <- buf
}
// Send an exception frame to driver through raw socket.
func (task *Task) ExceptionFrame(b []byte) {
const (
hitci = (2 * syscall.ARPHRD_IEEE802) + 2
lotci = hitci + 1
prio = (7 << (VLAN_PRIO_SHIFT - 8))
)
// set priority so that the xeth will forward to the
// respective upper device rather than it's port
b[hitci] |= prio
syscall.Sendto(task.fd, b, 0, &task.fda)
}
// Send carrier change to driver through hi-priority channel.
func (task *Task) SetCarrier(xid Xid, on bool) {
buf := newBuffer(internal.SizeofMsgCarrier)
msg := (*internal.MsgCarrier)(buf.pointer())
msg.Header.Set(internal.MsgKindCarrier)
msg.Xid = uint32(xid)
if on {
msg.Flag = internal.CarrierOn
} else {
msg.Flag = internal.CarrierOff
}
task.hich <- buf
}
// Send ethtool stat change to driver through leaky-bucket channel.
func (task *Task) SetEthtoolStat(xid Xid, stat uint32, n uint64) {
task.setStat(internal.MsgKindEthtoolStat, xid, stat, n)
}
// Send link stat change to driver through leaky-bucket channel.
func (task *Task) SetLinkStat(xid Xid, stat uint32, n uint64) {
task.setStat(internal.MsgKindLinkStat, xid, stat, n)
}
func (task *Task) setStat(kind uint8, xid Xid, stat uint32, n uint64) {
buf := newBuffer(internal.SizeofMsgStat)
msg := (*internal.MsgStat)(buf.pointer())
msg.Header.Set(kind)
msg.Xid = uint32(xid)
msg.Index = stat
msg.Count = n
task.hich <- buf
}
// Send speed change to driver through hi-priority channel.
func (task *Task) SetSpeed(xid Xid, mbps uint32) {
buf := newBuffer(internal.SizeofMsgSpeed)
msg := (*internal.MsgSpeed)(buf.pointer())
msg.Header.Set(internal.MsgKindSpeed)
msg.Xid = uint32(xid)
msg.Mbps = mbps
task.hich <- buf
}
// Wait for stop signal then shutdown and close socket
func (task *Task) goClose() {
defer goes.WG.Done()
<-goes.Stop
if task.sock == nil {
return
}
sock := task.sock
task.sock = nil
f, err := sock.File()
if err == nil {
syscall.Shutdown(int(f.Fd()), SHUT_RDWR)
}
sock.Close()
syscall.Close(task.fd)
}
func (task *Task) goRx(rxch chan<- Buffer) {
defer goes.WG.Done()
const minrxto = 10 * time.Millisecond
const maxrxto = 320 * time.Millisecond
rxto := minrxto
rxbuf := make([]byte, PageSize, PageSize)
rxoob := make([]byte, PageSize, PageSize)
ptr := unsafe.Pointer(&rxbuf[0])
h := (*internal.MsgHeader)(ptr)
defer func() {
rxbuf = rxbuf[:0]
rxoob = rxoob[:0]
close(rxch)
}()
for {
select {
case <-goes.Stop:
return
default:
}
task.RxErr = task.sock.SetReadDeadline(time.Now().Add(rxto))
if task.RxErr != nil {
break
}
n, noob, flags, addr, err := task.sock.ReadMsgUnix(rxbuf, rxoob)
_ = noob
_ = flags
_ = addr
select {
case <-goes.Stop:
return
default:
}
if n == 0 || isTimeout(err) {
if rxto < maxrxto {
rxto *= 2
}
} else if err != nil {
e, ok := err.(*os.SyscallError)
if !ok || e.Err.Error() != "EOF" {
task.RxErr = err
}
break
} else if task.RxErr = h.Validate(rxbuf[:n]); task.RxErr != nil {
break
} else {
rxto = minrxto
rxch <- cloneBuffer(rxbuf[:n])
Cloned.Inc()
}
}
}
func (task *Task) goTx(loch, hich <-chan buffer) {
defer goes.WG.Done()
for task.TxErr == nil {
select {
case <-goes.Stop:
return
case buf, ok := <-hich:
if ok {
task.TxErr = task.tx(buf, 0)
} else {
return
}
case buf, ok := <-loch:
if ok {
task.TxErr = task.tx(buf, 10*time.Millisecond)
} else {
return
}
}
}
}
// Send through low-priority, leaky-bucket.
func (task *Task) queue(buf buffer) {
select {
case task.loch <- buf:
default:
buf.pool()
Dropped.Inc()
}
}
func (task *Task) tx(buf buffer, timeout time.Duration) error {
var oob []byte
var dl time.Time
defer buf.pool()
if task.sock == nil {
return io.EOF
}
if timeout != time.Duration(0) {
dl = time.Now().Add(timeout)
}
err := task.sock.SetWriteDeadline(dl)
if err != nil {
return err
}
_, _, err = task.sock.WriteMsgUnix(buf.bytes(), oob, nil)
if err == nil {
Sent.Inc()
if kind(buf) == internal.MsgKindCarrier {
msg := (*internal.MsgCarrier)(buf.pointer())
xid := Xid(msg.Xid)
l := LinkOf(xid)
if l != nil {
l.LinkUp(msg.Flag == internal.CarrierOn)
}
}
}
return err
}
func isEAGAIN(err error) bool {
if err != nil {
if operr, ok := err.(*net.OpError); ok {
if oserr, ok := operr.Err.(*os.SyscallError); ok {
if oserr.Err == syscall.EAGAIN {
return true
}
}
}
}
return false
}
func isTimeout(err error) bool {
if err != nil {
if op, ok := err.(*net.OpError); ok {
return op.Timeout()
}
}
return false
}