// 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. package ipv6 import (	"net"	"syscall") // RFC 3542 optionsconst (	// See /usr/include/linux/ipv6.h,in6.h.	sysSockoptReceiveTrafficClass = syscall.IPV6_RECVTCLASS	sysSockoptTrafficClass        = syscall.IPV6_TCLASS	sysSockoptReceiveHopLimit     = syscall.IPV6_RECVHOPLIMIT	sysSockoptHopLimit            = syscall.IPV6_HOPLIMIT	sysSockoptReceivePacketInfo   = syscall.IPV6_RECVPKTINFO	sysSockoptPacketInfo          = syscall.IPV6_PKTINFO	sysSockoptReceivePathMTU      = 0x3c // IPV6_RECVPATHMTU	sysSockoptPathMTU             = 0x3d // IPV6_PATHMTU	sysSockoptNextHop             = syscall.IPV6_NEXTHOP	sysSockoptChecksum            = syscall.IPV6_CHECKSUM 	// See /usr/include/linux/icmpv6.h.	sysSockoptICMPFilter = 0x1 // syscall.ICMPV6_FILTER) func setSockaddr(sa *syscall.RawSockaddrInet6, ip net.IP, ifindex int) {	sa.Family = syscall.AF_INET6	copy(sa.Addr[:], ip)	sa.Scope_id = uint32(ifindex)}