Source file src/pkg/net/sockoptip_linux.go
1 // Copyright 2011 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 // IP-level socket options for Linux 6 7 package net 8 9 import ( 10 "os" 11 "syscall" 12 ) 13 14 func ipv4MulticastInterface(fd *netFD) (*Interface, error) { 15 if err := fd.incref(false); err != nil { 16 return nil, err 17 } 18 defer fd.decref() 19 mreq, err := syscall.GetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF) 20 if err != nil { 21 return nil, os.NewSyscallError("getsockopt", err) 22 } 23 if int(mreq.Ifindex) == 0 { 24 return nil, nil 25 } 26 return InterfaceByIndex(int(mreq.Ifindex)) 27 } 28 29 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error { 30 var v int32 31 if ifi != nil { 32 v = int32(ifi.Index) 33 } 34 mreq := &syscall.IPMreqn{Ifindex: v} 35 if err := fd.incref(false); err != nil { 36 return err 37 } 38 defer fd.decref() 39 err := syscall.SetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq) 40 if err != nil { 41 return os.NewSyscallError("setsockopt", err) 42 } 43 return nil 44 } 45 46 func ipv4MulticastTTL(fd *netFD) (int, error) { 47 if err := fd.incref(false); err != nil { 48 return 0, err 49 } 50 defer fd.decref() 51 v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_TTL) 52 if err != nil { 53 return -1, os.NewSyscallError("getsockopt", err) 54 } 55 return v, nil 56 } 57 58 func setIPv4MulticastTTL(fd *netFD, v int) error { 59 if err := fd.incref(false); err != nil { 60 return err 61 } 62 defer fd.decref() 63 err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_TTL, v) 64 if err != nil { 65 return os.NewSyscallError("setsockopt", err) 66 } 67 return nil 68 } 69 70 func ipv4MulticastLoopback(fd *netFD) (bool, error) { 71 if err := fd.incref(false); err != nil { 72 return false, err 73 } 74 defer fd.decref() 75 v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP) 76 if err != nil { 77 return false, os.NewSyscallError("getsockopt", err) 78 } 79 return v == 1, nil 80 } 81 82 func setIPv4MulticastLoopback(fd *netFD, v bool) error { 83 if err := fd.incref(false); err != nil { 84 return err 85 } 86 defer fd.decref() 87 err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v)) 88 if err != nil { 89 return os.NewSyscallError("setsockopt", err) 90 } 91 return nil 92 } 93 94 func ipv4ReceiveInterface(fd *netFD) (bool, error) { 95 if err := fd.incref(false); err != nil { 96 return false, err 97 } 98 defer fd.decref() 99 v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_PKTINFO) 100 if err != nil { 101 return false, os.NewSyscallError("getsockopt", err) 102 } 103 return v == 1, nil 104 } 105 106 func setIPv4ReceiveInterface(fd *netFD, v bool) error { 107 if err := fd.incref(false); err != nil { 108 return err 109 } 110 defer fd.decref() 111 err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_PKTINFO, boolint(v)) 112 if err != nil { 113 return os.NewSyscallError("setsockopt", err) 114 } 115 return nil 116 } 117 118 func ipv6TrafficClass(fd *netFD) (int, error) { 119 if err := fd.incref(false); err != nil { 120 return 0, err 121 } 122 defer fd.decref() 123 v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_TCLASS) 124 if err != nil { 125 return 0, os.NewSyscallError("getsockopt", err) 126 } 127 return v, nil 128 } 129 130 func setIPv6TrafficClass(fd *netFD, v int) error { 131 if err := fd.incref(false); err != nil { 132 return err 133 } 134 defer fd.decref() 135 err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_TCLASS, v) 136 if err != nil { 137 return os.NewSyscallError("setsockopt", err) 138 } 139 return nil 140 }