1// Copyright 2020 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
5package ipv6
6
7import (
8	"net"
9	"syscall"
10	"unsafe"
11
12	"golang.org/x/net/internal/iana"
13	"golang.org/x/net/internal/socket"
14
15	"golang.org/x/sys/unix"
16)
17
18var (
19	ctlOpts = [ctlMax]ctlOpt{
20		ctlHopLimit:   {unix.IPV6_HOPLIMIT, 4, marshalHopLimit, parseHopLimit},
21		ctlPacketInfo: {unix.IPV6_PKTINFO, sizeofInet6Pktinfo, marshalPacketInfo, parsePacketInfo},
22		ctlPathMTU:    {unix.IPV6_PATHMTU, sizeofIPv6Mtuinfo, marshalPathMTU, parsePathMTU},
23	}
24
25	sockOpts = map[int]*sockOpt{
26		ssoTrafficClass:        {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_TCLASS, Len: 4}},
27		ssoHopLimit:            {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_UNICAST_HOPS, Len: 4}},
28		ssoMulticastInterface:  {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_MULTICAST_IF, Len: 4}},
29		ssoMulticastHopLimit:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_MULTICAST_HOPS, Len: 4}},
30		ssoMulticastLoopback:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_MULTICAST_LOOP, Len: 4}},
31		ssoReceiveTrafficClass: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_RECVTCLASS, Len: 4}},
32		ssoReceiveHopLimit:     {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_RECVHOPLIMIT, Len: 4}},
33		ssoReceivePacketInfo:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_RECVPKTINFO, Len: 4}},
34		ssoReceivePathMTU:      {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_RECVPATHMTU, Len: 4}},
35		ssoChecksum:            {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.IPV6_CHECKSUM, Len: 4}},
36		ssoICMPFilter:          {Option: socket.Option{Level: iana.ProtocolIPv6ICMP, Name: unix.ICMP6_FILTER, Len: sizeofICMPv6Filter}},
37		ssoJoinGroup:           {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
38		ssoLeaveGroup:          {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
39		ssoJoinSourceGroup:     {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
40		ssoLeaveSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
41		ssoBlockSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
42		ssoUnblockSourceGroup:  {Option: socket.Option{Level: iana.ProtocolIPv6, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
43	}
44)
45
46func (sa *sockaddrInet6) setSockaddr(ip net.IP, i int) {
47	sa.Family = syscall.AF_INET6
48	copy(sa.Addr[:], ip)
49	sa.Scope_id = uint32(i)
50}
51
52func (pi *inet6Pktinfo) setIfindex(i int) {
53	pi.Ifindex = uint32(i)
54}
55
56func (gr *groupReq) setGroup(grp net.IP) {
57	sa := (*sockaddrInet6)(unsafe.Pointer(&gr.Group))
58	sa.Family = syscall.AF_INET6
59	sa.Len = sizeofSockaddrInet6
60	copy(sa.Addr[:], grp)
61}
62
63func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
64	sa := (*sockaddrInet6)(unsafe.Pointer(&gsr.Group))
65	sa.Family = syscall.AF_INET6
66	sa.Len = sizeofSockaddrInet6
67	copy(sa.Addr[:], grp)
68	sa = (*sockaddrInet6)(unsafe.Pointer(&gsr.Source))
69	sa.Family = syscall.AF_INET6
70	sa.Len = sizeofSockaddrInet6
71	copy(sa.Addr[:], src)
72}
73