go.net/ipv6: new package
Package ipv6 implements IP-level socket options for the Internet
Protocol version 6. It also provides datagram based network I/O
methods specific to the IPv6 and higher layer protocols.
Fixes golang/go#5538.
R=dave
CC=golang-dev
https://golang.org/cl/9843044
diff --git a/ipv6/sockopt_rfc3493_unix.go b/ipv6/sockopt_rfc3493_unix.go
new file mode 100644
index 0000000..b055cf0
--- /dev/null
+++ b/ipv6/sockopt_rfc3493_unix.go
@@ -0,0 +1,114 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd linux netbsd openbsd
+
+package ipv6
+
+import (
+ "net"
+ "os"
+ "syscall"
+)
+
+func ipv6TrafficClass(fd int) (int, error) {
+ v, err := syscall.GetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_TCLASS)
+ if err != nil {
+ return 0, os.NewSyscallError("getsockopt", err)
+ }
+ return v, nil
+}
+
+func setIPv6TrafficClass(fd, v int) error {
+ return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_TCLASS, v))
+}
+
+func ipv6HopLimit(fd int) (int, error) {
+ v, err := syscall.GetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_UNICAST_HOPS)
+ if err != nil {
+ return 0, os.NewSyscallError("getsockopt", err)
+ }
+ return v, nil
+}
+
+func setIPv6HopLimit(fd, v int) error {
+ return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_UNICAST_HOPS, v))
+}
+
+func ipv6Checksum(fd int) (bool, int, error) {
+ v, err := syscall.GetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_CHECKSUM)
+ if err != nil {
+ return false, 0, os.NewSyscallError("getsockopt", err)
+ }
+ on := true
+ if v == -1 {
+ on = false
+ }
+ return on, v, nil
+}
+
+func ipv6MulticastHopLimit(fd int) (int, error) {
+ v, err := syscall.GetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_MULTICAST_HOPS)
+ if err != nil {
+ return 0, os.NewSyscallError("getsockopt", err)
+ }
+ return v, nil
+}
+
+func setIPv6MulticastHopLimit(fd, v int) error {
+ return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_MULTICAST_HOPS, v))
+}
+
+func ipv6MulticastInterface(fd int) (*net.Interface, error) {
+ v, err := syscall.GetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_MULTICAST_IF)
+ if err != nil {
+ return nil, os.NewSyscallError("getsockopt", err)
+ }
+ if v == 0 {
+ return nil, nil
+ }
+ ifi, err := net.InterfaceByIndex(v)
+ if err != nil {
+ return nil, err
+ }
+ return ifi, nil
+}
+
+func setIPv6MulticastInterface(fd int, ifi *net.Interface) error {
+ var v int
+ if ifi != nil {
+ v = ifi.Index
+ }
+ return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_MULTICAST_IF, v))
+}
+
+func ipv6MulticastLoopback(fd int) (bool, error) {
+ v, err := syscall.GetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_MULTICAST_LOOP)
+ if err != nil {
+ return false, os.NewSyscallError("getsockopt", err)
+ }
+ return v == 1, nil
+}
+
+func setIPv6MulticastLoopback(fd int, v bool) error {
+ return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_MULTICAST_LOOP, boolint(v)))
+}
+
+func joinIPv6Group(fd int, ifi *net.Interface, grp net.IP) error {
+ mreq := syscall.IPv6Mreq{}
+ copy(mreq.Multiaddr[:], grp)
+ if ifi != nil {
+ mreq.Interface = uint32(ifi.Index)
+ }
+ return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd, ianaProtocolIPv6, syscall.IPV6_JOIN_GROUP, &mreq))
+}
+
+func leaveIPv6Group(fd int, ifi *net.Interface, grp net.IP) error {
+ mreq := syscall.IPv6Mreq{}
+ copy(mreq.Multiaddr[:], grp)
+ if ifi != nil {
+ mreq.Interface = uint32(ifi.Index)
+ }
+ return os.NewSyscallError("setsockopt", syscall.SetsockoptIPv6Mreq(fd, ianaProtocolIPv6, syscall.IPV6_LEAVE_GROUP, &mreq))
+}
