sys_linux.go (3109B)
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 5 package ipv4 6 7 import ( 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 18 var ( 19 ctlOpts = [ctlMax]ctlOpt{ 20 ctlTTL: {unix.IP_TTL, 1, marshalTTL, parseTTL}, 21 ctlPacketInfo: {unix.IP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo}, 22 } 23 24 sockOpts = map[int]*sockOpt{ 25 ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TOS, Len: 4}}, 26 ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TTL, Len: 4}}, 27 ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 4}}, 28 ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: unix.SizeofIPMreqn}, typ: ssoTypeIPMreqn}, 29 ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 4}}, 30 ssoReceiveTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVTTL, Len: 4}}, 31 ssoPacketInfo: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_PKTINFO, Len: 4}}, 32 ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_HDRINCL, Len: 4}}, 33 ssoICMPFilter: {Option: socket.Option{Level: iana.ProtocolReserved, Name: unix.ICMP_FILTER, Len: sizeofICMPFilter}}, 34 ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, 35 ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq}, 36 ssoJoinSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, 37 ssoLeaveSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, 38 ssoBlockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, 39 ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq}, 40 ssoAttachFilter: {Option: socket.Option{Level: unix.SOL_SOCKET, Name: unix.SO_ATTACH_FILTER, Len: unix.SizeofSockFprog}}, 41 } 42 ) 43 44 func (pi *inetPktinfo) setIfindex(i int) { 45 pi.Ifindex = int32(i) 46 } 47 48 func (gr *groupReq) setGroup(grp net.IP) { 49 sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group)) 50 sa.Family = syscall.AF_INET 51 copy(sa.Addr[:], grp) 52 } 53 54 func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) { 55 sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group)) 56 sa.Family = syscall.AF_INET 57 copy(sa.Addr[:], grp) 58 sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source)) 59 sa.Family = syscall.AF_INET 60 copy(sa.Addr[:], src) 61 }