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