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// Copyright 2014 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"
"runtime"
"strings"
"syscall"
"unsafe"
"golang.org/x/net/internal/iana"
"golang.org/x/net/internal/socket"
)
var (
ctlOpts = [ctlMax]ctlOpt{
ctlTTL: {sysIP_RECVTTL, 1, marshalTTL, parseTTL},
ctlDst: {sysIP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst},
ctlInterface: {sysIP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface},
}
sockOpts = map[int]*sockOpt{
ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TOS, Len: 4}},
ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_TTL, Len: 4}},
ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 1}},
ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: 4}},
ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 4}},
ssoReceiveTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVTTL, Len: 4}},
ssoReceiveDst: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVDSTADDR, Len: 4}},
ssoReceiveInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVIF, Len: 4}},
ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_HDRINCL, Len: 4}},
ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
ssoJoinSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
ssoLeaveSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
ssoBlockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
}
)
func init() {
freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate")
if freebsdVersion >= 1000000 {
sockOpts[ssoMulticastInterface] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: sizeofIPMreqn}, typ: ssoTypeIPMreqn}
}
if runtime.GOOS == "freebsd" && runtime.GOARCH == "386" {
archs, _ := syscall.Sysctl("kern.supported_archs")
for _, s := range strings.Fields(archs) {
if s == "amd64" {
freebsd32o64 = true
break
}
}
}
}
func (gr *groupReq) setGroup(grp net.IP) {
sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group))
sa.Len = sizeofSockaddrInet
sa.Family = syscall.AF_INET
copy(sa.Addr[:], grp)
}
func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group))
sa.Len = sizeofSockaddrInet
sa.Family = syscall.AF_INET
copy(sa.Addr[:], grp)
sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source))
sa.Len = sizeofSockaddrInet
sa.Family = syscall.AF_INET
copy(sa.Addr[:], src)
}
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