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55 lines
1.8 KiB
Go
55 lines
1.8 KiB
Go
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipv4
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import (
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"net"
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"syscall"
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"unsafe"
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)
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var (
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ctlOpts = [ctlMax]ctlOpt{
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ctlTTL: {sysIP_RECVTTL, 4, marshalTTL, parseTTL},
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ctlPacketInfo: {sysIP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
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}
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sockOpts = [ssoMax]sockOpt{
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ssoTOS: {sysIP_TOS, ssoTypeInt},
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ssoTTL: {sysIP_TTL, ssoTypeInt},
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ssoMulticastTTL: {sysIP_MULTICAST_TTL, ssoTypeByte},
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ssoMulticastInterface: {sysIP_MULTICAST_IF, ssoTypeInterface},
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ssoMulticastLoopback: {sysIP_MULTICAST_LOOP, ssoTypeByte},
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ssoReceiveTTL: {sysIP_RECVTTL, ssoTypeInt},
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ssoPacketInfo: {sysIP_RECVPKTINFO, ssoTypeInt},
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ssoHeaderPrepend: {sysIP_HDRINCL, ssoTypeInt},
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ssoJoinGroup: {sysMCAST_JOIN_GROUP, ssoTypeGroupReq},
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ssoLeaveGroup: {sysMCAST_LEAVE_GROUP, ssoTypeGroupReq},
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ssoJoinSourceGroup: {sysMCAST_JOIN_SOURCE_GROUP, ssoTypeGroupSourceReq},
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ssoLeaveSourceGroup: {sysMCAST_LEAVE_SOURCE_GROUP, ssoTypeGroupSourceReq},
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ssoBlockSourceGroup: {sysMCAST_BLOCK_SOURCE, ssoTypeGroupSourceReq},
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ssoUnblockSourceGroup: {sysMCAST_UNBLOCK_SOURCE, ssoTypeGroupSourceReq},
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}
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)
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func (pi *inetPktinfo) setIfindex(i int) {
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pi.Ifindex = uint32(i)
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}
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func (gr *groupReq) setGroup(grp net.IP) {
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sa := (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gr)) + 4))
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sa.Family = syscall.AF_INET
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copy(sa.Addr[:], grp)
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}
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func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
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sa := (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 4))
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sa.Family = syscall.AF_INET
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copy(sa.Addr[:], grp)
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sa = (*sockaddrInet)(unsafe.Pointer(uintptr(unsafe.Pointer(gsr)) + 260))
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sa.Family = syscall.AF_INET
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copy(sa.Addr[:], src)
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}
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