1 // Copyright 2016 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package route 6 7 import "syscall" 8 9 func (m *RouteMessage) marshal() ([]byte, error) { 10 l := sizeofRtMsghdr + addrsSpace(m.Addrs) 11 b := make([]byte, l) 12 nativeEndian.PutUint16(b[:2], uint16(l)) 13 if m.Version == 0 { 14 b[2] = sysRTM_VERSION 15 } else { 16 b[2] = byte(m.Version) 17 } 18 b[3] = byte(m.Type) 19 nativeEndian.PutUint16(b[4:6], uint16(sizeofRtMsghdr)) 20 nativeEndian.PutUint32(b[16:20], uint32(m.Flags)) 21 nativeEndian.PutUint16(b[6:8], uint16(m.Index)) 22 nativeEndian.PutUint32(b[24:28], uint32(m.ID)) 23 nativeEndian.PutUint32(b[28:32], uint32(m.Seq)) 24 attrs, err := marshalAddrs(b[sizeofRtMsghdr:], m.Addrs) 25 if err != nil { 26 return nil, err 27 } 28 if attrs > 0 { 29 nativeEndian.PutUint32(b[12:16], uint32(attrs)) 30 } 31 return b, nil 32 } 33 34 func (*wireFormat) parseRouteMessage(_ RIBType, b []byte) (Message, error) { 35 if len(b) < sizeofRtMsghdr { 36 return nil, errMessageTooShort 37 } 38 l := int(nativeEndian.Uint16(b[:2])) 39 if len(b) < l { 40 return nil, errInvalidMessage 41 } 42 m := &RouteMessage{ 43 Version: int(b[2]), 44 Type: int(b[3]), 45 Flags: int(nativeEndian.Uint32(b[16:20])), 46 Index: int(nativeEndian.Uint16(b[6:8])), 47 ID: uintptr(nativeEndian.Uint32(b[24:28])), 48 Seq: int(nativeEndian.Uint32(b[28:32])), 49 raw: b[:l], 50 } 51 ll := int(nativeEndian.Uint16(b[4:6])) 52 if len(b) < ll { 53 return nil, errInvalidMessage 54 } 55 errno := syscall.Errno(nativeEndian.Uint32(b[32:36])) 56 if errno != 0 { 57 m.Err = errno 58 } 59 as, err := parseAddrs(uint(nativeEndian.Uint32(b[12:16])), parseKernelInetAddr, b[ll:]) 60 if err != nil { 61 return nil, err 62 } 63 m.Addrs = as 64 return m, nil 65 } 66
