1// Copyright 2014 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 "golang.org/x/sys/unix" 15) 16 17var ( 18 ctlOpts = [ctlMax]ctlOpt{ 19 ctlTTL: {sysIP_TTL, 1, marshalTTL, parseTTL}, 20 ctlPacketInfo: {sysIP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo}, 21 } 22 23 sockOpts = map[int]*sockOpt{ 24 ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}}, 25 ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}}, 26 ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 4}}, 27 ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: sizeofIPMreqn}, typ: ssoTypeIPMreqn}, 28 ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}}, 29 ssoReceiveTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVTTL, Len: 4}}, 30 ssoPacketInfo: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_PKTINFO, Len: 4}}, 31 ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}}, 32 ssoICMPFilter: {Option: socket.Option{Level: iana.ProtocolReserved, Name: sysICMP_FILTER, Len: sizeofICMPFilter}}, 33 ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, 34 ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, 35 ssoJoinSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, 36 ssoLeaveSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, 37 ssoBlockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, 38 ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, 39 ssoAttachFilter: {Option: socket.Option{Level: unix.SOL_SOCKET, Name: unix.SO_ATTACH_FILTER, Len: unix.SizeofSockFprog}}, 40 } 41) 42 43func (pi *inetPktinfo) setIfindex(i int) { 44 pi.Ifindex = int32(i) 45} 46 47func (gr *groupReq) setGroup(grp net.IP) { 48 sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group)) 49 sa.Family = syscall.AF_INET 50 copy(sa.Addr[:], grp) 51} 52 53func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) { 54 sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group)) 55 sa.Family = syscall.AF_INET 56 copy(sa.Addr[:], grp) 57 sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source)) 58 sa.Family = syscall.AF_INET 59 copy(sa.Addr[:], src) 60} 61