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cproxy.go
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cproxy.go
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// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package udp
//#include "proxy.h"
import "C"
import (
"net"
"os"
"reflect"
"unsafe"
log "github.com/coreos/flannel/Godeps/_workspace/src/github.com/golang/glog"
"github.com/coreos/flannel/pkg/ip"
)
func runCProxy(tun *os.File, conn *net.UDPConn, ctl *os.File, tunIP ip.IP4, tunMTU int) {
var log_errors int
if log.V(1) {
log_errors = 1
}
c, err := conn.File()
if err != nil {
log.Error("Converting UDPConn to File failed: ", err)
return
}
defer c.Close()
C.run_proxy(
C.int(tun.Fd()),
C.int(c.Fd()),
C.int(ctl.Fd()),
C.in_addr_t(tunIP.NetworkOrder()),
C.size_t(tunMTU),
C.int(log_errors),
)
}
func writeCommand(f *os.File, cmd *C.command) {
hdr := reflect.SliceHeader{
Data: uintptr(unsafe.Pointer(cmd)),
Len: int(unsafe.Sizeof(*cmd)),
Cap: int(unsafe.Sizeof(*cmd)),
}
buf := *(*[]byte)(unsafe.Pointer(&hdr))
f.Write(buf)
}
func setRoute(ctl *os.File, dst ip.IP4Net, nextHopIP ip.IP4, nextHopPort int) {
cmd := C.command{
cmd: C.CMD_SET_ROUTE,
dest_net: C.in_addr_t(dst.IP.NetworkOrder()),
dest_net_len: C.int(dst.PrefixLen),
next_hop_ip: C.in_addr_t(nextHopIP.NetworkOrder()),
next_hop_port: C.short(nextHopPort),
}
writeCommand(ctl, &cmd)
}
func removeRoute(ctl *os.File, dst ip.IP4Net) {
cmd := C.command{
cmd: C.CMD_DEL_ROUTE,
dest_net: C.in_addr_t(dst.IP.NetworkOrder()),
dest_net_len: C.int(dst.PrefixLen),
}
writeCommand(ctl, &cmd)
}
func stopProxy(ctl *os.File) {
cmd := C.command{
cmd: C.CMD_STOP,
}
writeCommand(ctl, &cmd)
}