sys_freebsd.go

Documentation: golang.org/x/net/ipv4

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package ipv4
     6  
     7  import (
     8  	"net"
     9  	"runtime"
    10  	"strings"
    11  	"syscall"
    12  	"unsafe"
    13  
    14  	"golang.org/x/net/internal/iana"
    15  	"golang.org/x/net/internal/socket"
    16  
    17  	"golang.org/x/sys/unix"
    18  )
    19  
    20  const sockoptReceiveInterface = unix.IP_RECVIF
    21  
    22  var (
    23  	ctlOpts = [ctlMax]ctlOpt{
    24  		ctlTTL:       {unix.IP_RECVTTL, 1, marshalTTL, parseTTL},
    25  		ctlDst:       {unix.IP_RECVDSTADDR, net.IPv4len, marshalDst, parseDst},
    26  		ctlInterface: {unix.IP_RECVIF, syscall.SizeofSockaddrDatalink, marshalInterface, parseInterface},
    27  	}
    28  
    29  	sockOpts = map[int]*sockOpt{
    30  		ssoTOS:                {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TOS, Len: 4}},
    31  		ssoTTL:                {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_TTL, Len: 4}},
    32  		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_TTL, Len: 1}},
    33  		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: 4}},
    34  		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_LOOP, Len: 4}},
    35  		ssoReceiveTTL:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVTTL, Len: 4}},
    36  		ssoReceiveDst:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVDSTADDR, Len: 4}},
    37  		ssoReceiveInterface:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_RECVIF, Len: 4}},
    38  		ssoHeaderPrepend:      {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_HDRINCL, Len: 4}},
    39  		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    40  		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
    41  		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    42  		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    43  		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    44  		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: unix.MCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
    45  	}
    46  )
    47  
    48  func init() {
    49  	freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate")
    50  	if freebsdVersion >= 1000000 {
    51  		sockOpts[ssoMulticastInterface] = &sockOpt{Option: socket.Option{Level: iana.ProtocolIP, Name: unix.IP_MULTICAST_IF, Len: unix.SizeofIPMreqn}, typ: ssoTypeIPMreqn}
    52  	}
    53  	if runtime.GOOS == "freebsd" && runtime.GOARCH == "386" {
    54  		archs, _ := syscall.Sysctl("kern.supported_archs")
    55  		for _, s := range strings.Fields(archs) {
    56  			if s == "amd64" {
    57  				compatFreeBSD32 = true
    58  				break
    59  			}
    60  		}
    61  	}
    62  }
    63  
    64  func (gr *groupReq) setGroup(grp net.IP) {
    65  	sa := (*sockaddrInet)(unsafe.Pointer(&gr.Group))
    66  	sa.Len = sizeofSockaddrInet
    67  	sa.Family = syscall.AF_INET
    68  	copy(sa.Addr[:], grp)
    69  }
    70  
    71  func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
    72  	sa := (*sockaddrInet)(unsafe.Pointer(&gsr.Group))
    73  	sa.Len = sizeofSockaddrInet
    74  	sa.Family = syscall.AF_INET
    75  	copy(sa.Addr[:], grp)
    76  	sa = (*sockaddrInet)(unsafe.Pointer(&gsr.Source))
    77  	sa.Len = sizeofSockaddrInet
    78  	sa.Family = syscall.AF_INET
    79  	copy(sa.Addr[:], src)
    80  }
    81
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