364 lines
8.6 KiB
Go
364 lines
8.6 KiB
Go
//go:build !android && !e2e_testing
|
|
// +build !android,!e2e_testing
|
|
|
|
package udp
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"net"
|
|
"syscall"
|
|
"unsafe"
|
|
|
|
"github.com/rcrowley/go-metrics"
|
|
"github.com/sirupsen/logrus"
|
|
"github.com/slackhq/nebula/config"
|
|
"github.com/slackhq/nebula/firewall"
|
|
"github.com/slackhq/nebula/header"
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
//TODO: make it support reload as best you can!
|
|
|
|
type StdConn struct {
|
|
sysFd int
|
|
isV4 bool
|
|
l *logrus.Logger
|
|
batch int
|
|
}
|
|
|
|
var x int
|
|
|
|
// From linux/sock_diag.h
|
|
const (
|
|
_SK_MEMINFO_RMEM_ALLOC = iota
|
|
_SK_MEMINFO_RCVBUF
|
|
_SK_MEMINFO_WMEM_ALLOC
|
|
_SK_MEMINFO_SNDBUF
|
|
_SK_MEMINFO_FWD_ALLOC
|
|
_SK_MEMINFO_WMEM_QUEUED
|
|
_SK_MEMINFO_OPTMEM
|
|
_SK_MEMINFO_BACKLOG
|
|
_SK_MEMINFO_DROPS
|
|
|
|
_SK_MEMINFO_VARS
|
|
)
|
|
|
|
type _SK_MEMINFO [_SK_MEMINFO_VARS]uint32
|
|
|
|
func maybeIPV4(ip net.IP) (net.IP, bool) {
|
|
ip4 := ip.To4()
|
|
if ip4 != nil {
|
|
return ip4, true
|
|
}
|
|
return ip, false
|
|
}
|
|
|
|
func NewListener(l *logrus.Logger, ip net.IP, port int, multi bool, batch int) (Conn, error) {
|
|
ipV4, isV4 := maybeIPV4(ip)
|
|
af := unix.AF_INET6
|
|
if isV4 {
|
|
af = unix.AF_INET
|
|
}
|
|
syscall.ForkLock.RLock()
|
|
fd, err := unix.Socket(af, unix.SOCK_DGRAM, unix.IPPROTO_UDP)
|
|
if err == nil {
|
|
unix.CloseOnExec(fd)
|
|
}
|
|
syscall.ForkLock.RUnlock()
|
|
|
|
if err != nil {
|
|
unix.Close(fd)
|
|
return nil, fmt.Errorf("unable to open socket: %s", err)
|
|
}
|
|
|
|
if multi {
|
|
if err = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_REUSEPORT, 1); err != nil {
|
|
return nil, fmt.Errorf("unable to set SO_REUSEPORT: %s", err)
|
|
}
|
|
}
|
|
|
|
//TODO: support multiple listening IPs (for limiting ipv6)
|
|
var sa unix.Sockaddr
|
|
if isV4 {
|
|
sa4 := &unix.SockaddrInet4{Port: port}
|
|
copy(sa4.Addr[:], ipV4)
|
|
sa = sa4
|
|
} else {
|
|
sa6 := &unix.SockaddrInet6{Port: port}
|
|
copy(sa6.Addr[:], ip.To16())
|
|
sa = sa6
|
|
}
|
|
if err = unix.Bind(fd, sa); err != nil {
|
|
return nil, fmt.Errorf("unable to bind to socket: %s", err)
|
|
}
|
|
|
|
//TODO: this may be useful for forcing threads into specific cores
|
|
//unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_INCOMING_CPU, x)
|
|
//v, err := unix.GetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_INCOMING_CPU)
|
|
//l.Println(v, err)
|
|
|
|
return &StdConn{sysFd: fd, isV4: isV4, l: l, batch: batch}, err
|
|
}
|
|
|
|
func (u *StdConn) Rebind() error {
|
|
return nil
|
|
}
|
|
|
|
func (u *StdConn) SetRecvBuffer(n int) error {
|
|
return unix.SetsockoptInt(u.sysFd, unix.SOL_SOCKET, unix.SO_RCVBUFFORCE, n)
|
|
}
|
|
|
|
func (u *StdConn) SetSendBuffer(n int) error {
|
|
return unix.SetsockoptInt(u.sysFd, unix.SOL_SOCKET, unix.SO_SNDBUFFORCE, n)
|
|
}
|
|
|
|
func (u *StdConn) GetRecvBuffer() (int, error) {
|
|
return unix.GetsockoptInt(int(u.sysFd), unix.SOL_SOCKET, unix.SO_RCVBUF)
|
|
}
|
|
|
|
func (u *StdConn) GetSendBuffer() (int, error) {
|
|
return unix.GetsockoptInt(int(u.sysFd), unix.SOL_SOCKET, unix.SO_SNDBUF)
|
|
}
|
|
|
|
func (u *StdConn) LocalAddr() (*Addr, error) {
|
|
sa, err := unix.Getsockname(u.sysFd)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
addr := &Addr{}
|
|
switch sa := sa.(type) {
|
|
case *unix.SockaddrInet4:
|
|
addr.IP = net.IP{sa.Addr[0], sa.Addr[1], sa.Addr[2], sa.Addr[3]}.To16()
|
|
addr.Port = uint16(sa.Port)
|
|
case *unix.SockaddrInet6:
|
|
addr.IP = sa.Addr[0:]
|
|
addr.Port = uint16(sa.Port)
|
|
}
|
|
|
|
return addr, nil
|
|
}
|
|
|
|
func (u *StdConn) ListenOut(r EncReader, lhf LightHouseHandlerFunc, cache *firewall.ConntrackCacheTicker, q int) {
|
|
plaintext := make([]byte, MTU)
|
|
h := &header.H{}
|
|
fwPacket := &firewall.Packet{}
|
|
udpAddr := &Addr{}
|
|
nb := make([]byte, 12, 12)
|
|
|
|
//TODO: should we track this?
|
|
//metric := metrics.GetOrRegisterHistogram("test.batch_read", nil, metrics.NewExpDecaySample(1028, 0.015))
|
|
msgs, buffers, names := u.PrepareRawMessages(u.batch)
|
|
read := u.ReadMulti
|
|
if u.batch == 1 {
|
|
read = u.ReadSingle
|
|
}
|
|
|
|
for {
|
|
n, err := read(msgs)
|
|
if err != nil {
|
|
u.l.WithError(err).Debug("udp socket is closed, exiting read loop")
|
|
return
|
|
}
|
|
|
|
//metric.Update(int64(n))
|
|
for i := 0; i < n; i++ {
|
|
if u.isV4 {
|
|
udpAddr.IP = names[i][4:8]
|
|
} else {
|
|
udpAddr.IP = names[i][8:24]
|
|
}
|
|
udpAddr.Port = binary.BigEndian.Uint16(names[i][2:4])
|
|
r(udpAddr, plaintext[:0], buffers[i][:msgs[i].Len], h, fwPacket, lhf, nb, q, cache.Get(u.l))
|
|
}
|
|
}
|
|
}
|
|
|
|
func (u *StdConn) ReadSingle(msgs []rawMessage) (int, error) {
|
|
for {
|
|
n, _, err := unix.Syscall6(
|
|
unix.SYS_RECVMSG,
|
|
uintptr(u.sysFd),
|
|
uintptr(unsafe.Pointer(&(msgs[0].Hdr))),
|
|
0,
|
|
0,
|
|
0,
|
|
0,
|
|
)
|
|
|
|
if err != 0 {
|
|
return 0, &net.OpError{Op: "recvmsg", Err: err}
|
|
}
|
|
|
|
msgs[0].Len = uint32(n)
|
|
return 1, nil
|
|
}
|
|
}
|
|
|
|
func (u *StdConn) ReadMulti(msgs []rawMessage) (int, error) {
|
|
for {
|
|
n, _, err := unix.Syscall6(
|
|
unix.SYS_RECVMMSG,
|
|
uintptr(u.sysFd),
|
|
uintptr(unsafe.Pointer(&msgs[0])),
|
|
uintptr(len(msgs)),
|
|
unix.MSG_WAITFORONE,
|
|
0,
|
|
0,
|
|
)
|
|
|
|
if err != 0 {
|
|
return 0, &net.OpError{Op: "recvmmsg", Err: err}
|
|
}
|
|
|
|
return int(n), nil
|
|
}
|
|
}
|
|
|
|
func (u *StdConn) WriteTo(b []byte, addr *Addr) error {
|
|
if u.isV4 {
|
|
return u.writeTo4(b, addr)
|
|
}
|
|
return u.writeTo6(b, addr)
|
|
}
|
|
|
|
func (u *StdConn) writeTo6(b []byte, addr *Addr) error {
|
|
var rsa unix.RawSockaddrInet6
|
|
rsa.Family = unix.AF_INET6
|
|
// Little Endian -> Network Endian
|
|
rsa.Port = (addr.Port >> 8) | ((addr.Port & 0xff) << 8)
|
|
copy(rsa.Addr[:], addr.IP.To16())
|
|
|
|
for {
|
|
_, _, err := unix.Syscall6(
|
|
unix.SYS_SENDTO,
|
|
uintptr(u.sysFd),
|
|
uintptr(unsafe.Pointer(&b[0])),
|
|
uintptr(len(b)),
|
|
uintptr(0),
|
|
uintptr(unsafe.Pointer(&rsa)),
|
|
uintptr(unix.SizeofSockaddrInet6),
|
|
)
|
|
|
|
if err != 0 {
|
|
return &net.OpError{Op: "sendto", Err: err}
|
|
}
|
|
|
|
//TODO: handle incomplete writes
|
|
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func (u *StdConn) writeTo4(b []byte, addr *Addr) error {
|
|
addrV4, isAddrV4 := maybeIPV4(addr.IP)
|
|
if !isAddrV4 {
|
|
return fmt.Errorf("Listener is IPv4, but writing to IPv6 remote")
|
|
}
|
|
|
|
var rsa unix.RawSockaddrInet4
|
|
rsa.Family = unix.AF_INET
|
|
// Little Endian -> Network Endian
|
|
rsa.Port = (addr.Port >> 8) | ((addr.Port & 0xff) << 8)
|
|
copy(rsa.Addr[:], addrV4)
|
|
|
|
for {
|
|
_, _, err := unix.Syscall6(
|
|
unix.SYS_SENDTO,
|
|
uintptr(u.sysFd),
|
|
uintptr(unsafe.Pointer(&b[0])),
|
|
uintptr(len(b)),
|
|
uintptr(0),
|
|
uintptr(unsafe.Pointer(&rsa)),
|
|
uintptr(unix.SizeofSockaddrInet4),
|
|
)
|
|
|
|
if err != 0 {
|
|
return &net.OpError{Op: "sendto", Err: err}
|
|
}
|
|
|
|
//TODO: handle incomplete writes
|
|
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func (u *StdConn) ReloadConfig(c *config.C) {
|
|
b := c.GetInt("listen.read_buffer", 0)
|
|
if b > 0 {
|
|
err := u.SetRecvBuffer(b)
|
|
if err == nil {
|
|
s, err := u.GetRecvBuffer()
|
|
if err == nil {
|
|
u.l.WithField("size", s).Info("listen.read_buffer was set")
|
|
} else {
|
|
u.l.WithError(err).Warn("Failed to get listen.read_buffer")
|
|
}
|
|
} else {
|
|
u.l.WithError(err).Error("Failed to set listen.read_buffer")
|
|
}
|
|
}
|
|
|
|
b = c.GetInt("listen.write_buffer", 0)
|
|
if b > 0 {
|
|
err := u.SetSendBuffer(b)
|
|
if err == nil {
|
|
s, err := u.GetSendBuffer()
|
|
if err == nil {
|
|
u.l.WithField("size", s).Info("listen.write_buffer was set")
|
|
} else {
|
|
u.l.WithError(err).Warn("Failed to get listen.write_buffer")
|
|
}
|
|
} else {
|
|
u.l.WithError(err).Error("Failed to set listen.write_buffer")
|
|
}
|
|
}
|
|
}
|
|
|
|
func (u *StdConn) getMemInfo(meminfo *_SK_MEMINFO) error {
|
|
var vallen uint32 = 4 * _SK_MEMINFO_VARS
|
|
_, _, err := unix.Syscall6(unix.SYS_GETSOCKOPT, uintptr(u.sysFd), uintptr(unix.SOL_SOCKET), uintptr(unix.SO_MEMINFO), uintptr(unsafe.Pointer(meminfo)), uintptr(unsafe.Pointer(&vallen)), 0)
|
|
if err != 0 {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (u *StdConn) Close() error {
|
|
//TODO: this will not interrupt the read loop
|
|
return syscall.Close(u.sysFd)
|
|
}
|
|
|
|
func NewUDPStatsEmitter(udpConns []Conn) func() {
|
|
// Check if our kernel supports SO_MEMINFO before registering the gauges
|
|
var udpGauges [][_SK_MEMINFO_VARS]metrics.Gauge
|
|
var meminfo _SK_MEMINFO
|
|
if err := udpConns[0].(*StdConn).getMemInfo(&meminfo); err == nil {
|
|
udpGauges = make([][_SK_MEMINFO_VARS]metrics.Gauge, len(udpConns))
|
|
for i := range udpConns {
|
|
udpGauges[i] = [_SK_MEMINFO_VARS]metrics.Gauge{
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.rmem_alloc", i), nil),
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.rcvbuf", i), nil),
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.wmem_alloc", i), nil),
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.sndbuf", i), nil),
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.fwd_alloc", i), nil),
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.wmem_queued", i), nil),
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.optmem", i), nil),
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.backlog", i), nil),
|
|
metrics.GetOrRegisterGauge(fmt.Sprintf("udp.%d.drops", i), nil),
|
|
}
|
|
}
|
|
}
|
|
|
|
return func() {
|
|
for i, gauges := range udpGauges {
|
|
if err := udpConns[i].(*StdConn).getMemInfo(&meminfo); err == nil {
|
|
for j := 0; j < _SK_MEMINFO_VARS; j++ {
|
|
gauges[j].Update(int64(meminfo[j]))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|