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 ipv4
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		ctlPacketInfo: {unix.IP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
21	}
22
23	sockOpts = map[int]*sockOpt{
24		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 1}},
25		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: 4}},
26		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 1}},
27		ssoPacketInfo:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVPKTINFO, Len: 4}},
28		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
29		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
30		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
31		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
32		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
33		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
34	}
35)
36
37func (pi *inetPktinfo) setIfindex(i int) {
38	pi.Ifindex = uint32(i)
39}
40
41func (gr *groupReq) setGroup(grp net.IP) {
42	sa := (*sockaddrInet4)(unsafe.Pointer(&gr.Group))
43	sa.Family = syscall.AF_INET
44	sa.Len = sizeofSockaddrInet4
45	copy(sa.Addr[:], grp)
46}
47
48func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
49	sa := (*sockaddrInet4)(unsafe.Pointer(&gsr.Group))
50	sa.Family = syscall.AF_INET
51	sa.Len = sizeofSockaddrInet4
52	copy(sa.Addr[:], grp)
53	sa = (*sockaddrInet4)(unsafe.Pointer(&gsr.Source))
54	sa.Family = syscall.AF_INET
55	sa.Len = sizeofSockaddrInet4
56	copy(sa.Addr[:], src)
57}
58