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 func (w *wireFormat) parseInterfaceMessage(typ RIBType, b []byte) (Message, error) { 8 var extOff, bodyOff int 9 if typ == sysNET_RT_IFLISTL { 10 if len(b) < 20 { 11 return nil, errMessageTooShort 12 } 13 extOff = int(nativeEndian.Uint16(b[18:20])) 14 bodyOff = int(nativeEndian.Uint16(b[16:18])) 15 } else { 16 extOff = w.extOff 17 bodyOff = w.bodyOff 18 } 19 if len(b) < extOff || len(b) < bodyOff { 20 return nil, errInvalidMessage 21 } 22 l := int(nativeEndian.Uint16(b[:2])) 23 if len(b) < l { 24 return nil, errInvalidMessage 25 } 26 attrs := uint(nativeEndian.Uint32(b[4:8])) 27 if attrs&sysRTA_IFP == 0 { 28 return nil, nil 29 } 30 m := &InterfaceMessage{ 31 Version: int(b[2]), 32 Type: int(b[3]), 33 Flags: int(nativeEndian.Uint32(b[8:12])), 34 Index: int(nativeEndian.Uint16(b[12:14])), 35 Addrs: make([]Addr, sysRTAX_MAX), 36 extOff: extOff, 37 raw: b[:l], 38 } 39 a, err := parseLinkAddr(b[bodyOff:]) 40 if err != nil { 41 return nil, err 42 } 43 m.Addrs[sysRTAX_IFP] = a 44 m.Name = a.(*LinkAddr).Name 45 return m, nil 46 } 47 48 func (w *wireFormat) parseInterfaceAddrMessage(typ RIBType, b []byte) (Message, error) { 49 var bodyOff int 50 if typ == sysNET_RT_IFLISTL { 51 if len(b) < 24 { 52 return nil, errMessageTooShort 53 } 54 bodyOff = int(nativeEndian.Uint16(b[16:18])) 55 } else { 56 bodyOff = w.bodyOff 57 } 58 if len(b) < bodyOff { 59 return nil, errInvalidMessage 60 } 61 l := int(nativeEndian.Uint16(b[:2])) 62 if len(b) < l { 63 return nil, errInvalidMessage 64 } 65 m := &InterfaceAddrMessage{ 66 Version: int(b[2]), 67 Type: int(b[3]), 68 Flags: int(nativeEndian.Uint32(b[8:12])), 69 Index: int(nativeEndian.Uint16(b[12:14])), 70 raw: b[:l], 71 } 72 var err error 73 m.Addrs, err = parseAddrs(uint(nativeEndian.Uint32(b[4:8])), parseKernelInetAddr, b[bodyOff:]) 74 if err != nil { 75 return nil, err 76 } 77 return m, nil 78 } 79
