sys_ssmreq.go raw

   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  //go:build aix || darwin || freebsd || linux || solaris || zos
   6  
   7  package ipv6
   8  
   9  import (
  10  	"net"
  11  	"unsafe"
  12  
  13  	"golang.org/x/net/internal/socket"
  14  )
  15  
  16  var compatFreeBSD32 bool // 386 emulation on amd64
  17  
  18  func (so *sockOpt) setGroupReq(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
  19  	var gr groupReq
  20  	if ifi != nil {
  21  		gr.Interface = uint32(ifi.Index)
  22  	}
  23  	gr.setGroup(grp)
  24  	var b []byte
  25  	if compatFreeBSD32 {
  26  		var d [sizeofGroupReq + 4]byte
  27  		s := (*[sizeofGroupReq]byte)(unsafe.Pointer(&gr))
  28  		copy(d[:4], s[:4])
  29  		copy(d[8:], s[4:])
  30  		b = d[:]
  31  	} else {
  32  		b = (*[sizeofGroupReq]byte)(unsafe.Pointer(&gr))[:sizeofGroupReq]
  33  	}
  34  	return so.Set(c, b)
  35  }
  36  
  37  func (so *sockOpt) setGroupSourceReq(c *socket.Conn, ifi *net.Interface, grp, src net.IP) error {
  38  	var gsr groupSourceReq
  39  	if ifi != nil {
  40  		gsr.Interface = uint32(ifi.Index)
  41  	}
  42  	gsr.setSourceGroup(grp, src)
  43  	var b []byte
  44  	if compatFreeBSD32 {
  45  		var d [sizeofGroupSourceReq + 4]byte
  46  		s := (*[sizeofGroupSourceReq]byte)(unsafe.Pointer(&gsr))
  47  		copy(d[:4], s[:4])
  48  		copy(d[8:], s[4:])
  49  		b = d[:]
  50  	} else {
  51  		b = (*[sizeofGroupSourceReq]byte)(unsafe.Pointer(&gsr))[:sizeofGroupSourceReq]
  52  	}
  53  	return so.Set(c, b)
  54  }
  55