81 lines
3.5 KiB
Go
81 lines
3.5 KiB
Go
// Copyright 2014 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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"runtime"
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"strings"
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"syscall"
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"unsafe"
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"golang.org/x/net/internal/iana"
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"golang.org/x/net/internal/socket"
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"golang.org/x/sys/unix"
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)
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const sockoptReceiveInterface = unix.IP_RECVIF
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var (
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ctlOpts = [ctlMax]ctlOpt{
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ctlTTL: {unix.IP_RECVTTL, 1, marshalTTL, parseTTL},
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ctlDst: {unix.IP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst},
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ctlInterface: {unix.IP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface},
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}
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sockOpts = map[int]*sockOpt{
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ssoTOS: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TOS, Len: 4}},
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ssoTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TTL, Len: 4}},
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ssoMulticastTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 1}},
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ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: 4}},
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ssoMulticastLoopback: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 4}},
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ssoReceiveTTL: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVTTL, Len: 4}},
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ssoReceiveDst: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVDSTADDR, Len: 4}},
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ssoReceiveInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVIF, Len: 4}},
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ssoHeaderPrepend: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_HDRINCL, Len: 4}},
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ssoJoinGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
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ssoLeaveGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
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ssoJoinSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
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ssoLeaveSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
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ssoBlockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
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ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
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}
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)
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func init() {
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freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate")
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if freebsdVersion >= 1000000 {
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sockOpts[ssoMulticastInterface] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: unix.SizeofIPMreqn}, typ: ssoTypeIPMreqn}
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}
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if runtime.GOOS == "freebsd" && runtime.GOARCH == "386" {
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archs, _ := syscall.Sysctl("kern.supported_archs")
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for _, s := range strings.Fields(archs) {
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if s == "amd64" {
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compatFreeBSD32 = true
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break
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}
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}
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}
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}
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func (gr *groupReq) setGroup(grp net.IP) {
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sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group))
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sa.Len = sizeofSockaddrInet
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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(&gsr.Group))
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sa.Len = sizeofSockaddrInet
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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(&gsr.Source))
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sa.Len = sizeofSockaddrInet
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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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