74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
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// 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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)
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var (
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ctlOpts = [ctlMax]ctlOpt{
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ctlTTL: {sysIP_RECVTTL, 1, marshalTTL, parseTTL},
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ctlDst: {sysIP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst},
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ctlInterface: {sysIP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface},
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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, ssoTypeInt},
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ssoReceiveTTL: {sysIP_RECVTTL, ssoTypeInt},
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ssoReceiveDst: {sysIP_RECVDSTADDR, ssoTypeInt},
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ssoReceiveInterface: {sysIP_RECVIF, 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 init() {
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freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate")
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if freebsdVersion >= 1000000 {
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sockOpts[ssoMulticastInterface].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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freebsd32o64 = 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 *sysGroupReq) setGroup(grp net.IP) {
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sa := (*sysSockaddrInet)(unsafe.Pointer(&gr.Group))
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sa.Len = sysSizeofSockaddrInet
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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 *sysGroupSourceReq) setSourceGroup(grp, src net.IP) {
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sa := (*sysSockaddrInet)(unsafe.Pointer(&gsr.Group))
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sa.Len = sysSizeofSockaddrInet
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sa.Family = syscall.AF_INET
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copy(sa.Addr[:], grp)
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sa = (*sysSockaddrInet)(unsafe.Pointer(&gsr.Source))
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sa.Len = sysSizeofSockaddrInet
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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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