296 lines
7.2 KiB
Go
296 lines
7.2 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 Conn struct {
|
|
sysFd int
|
|
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 NewListener(l *logrus.Logger, ip string, port int, multi bool, batch int) (*Conn, error) {
|
|
syscall.ForkLock.RLock()
|
|
fd, err := unix.Socket(unix.AF_INET6, 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)
|
|
}
|
|
|
|
var lip [16]byte
|
|
copy(lip[:], net.ParseIP(ip))
|
|
|
|
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)
|
|
if err = unix.Bind(fd, &unix.SockaddrInet6{Addr: lip, Port: port}); 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 &Conn{sysFd: fd, l: l, batch: batch}, err
|
|
}
|
|
|
|
func (u *Conn) Rebind() error {
|
|
return nil
|
|
}
|
|
|
|
func (u *Conn) SetRecvBuffer(n int) error {
|
|
return unix.SetsockoptInt(u.sysFd, unix.SOL_SOCKET, unix.SO_RCVBUFFORCE, n)
|
|
}
|
|
|
|
func (u *Conn) SetSendBuffer(n int) error {
|
|
return unix.SetsockoptInt(u.sysFd, unix.SOL_SOCKET, unix.SO_SNDBUFFORCE, n)
|
|
}
|
|
|
|
func (u *Conn) GetRecvBuffer() (int, error) {
|
|
return unix.GetsockoptInt(int(u.sysFd), unix.SOL_SOCKET, unix.SO_RCVBUF)
|
|
}
|
|
|
|
func (u *Conn) GetSendBuffer() (int, error) {
|
|
return unix.GetsockoptInt(int(u.sysFd), unix.SOL_SOCKET, unix.SO_SNDBUF)
|
|
}
|
|
|
|
func (u *Conn) 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 *Conn) 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).Error("Failed to read packets")
|
|
continue
|
|
}
|
|
|
|
//metric.Update(int64(n))
|
|
for i := 0; i < n; i++ {
|
|
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 *Conn) 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 *Conn) 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 *Conn) WriteTo(b []byte, addr *Addr) error {
|
|
|
|
var rsa unix.RawSockaddrInet6
|
|
rsa.Family = unix.AF_INET6
|
|
p := (*[2]byte)(unsafe.Pointer(&rsa.Port))
|
|
p[0] = byte(addr.Port >> 8)
|
|
p[1] = byte(addr.Port)
|
|
copy(rsa.Addr[:], addr.IP)
|
|
|
|
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 *Conn) 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 *Conn) 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 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].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].getMemInfo(&meminfo); err == nil {
|
|
for j := 0; j < _SK_MEMINFO_VARS; j++ {
|
|
gauges[j].Update(int64(meminfo[j]))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|