github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/net/ipv6/sys_ssmreq.go (about)

     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  // +build aix darwin freebsd linux solaris zos
     7  
     8  package ipv6
     9  
    10  import (
    11  	"net"
    12  	"unsafe"
    13  
    14  	"github.com/hxx258456/ccgo/net/internal/socket"
    15  )
    16  
    17  var compatFreeBSD32 bool // 386 emulation on amd64
    18  
    19  func (so *sockOpt) setGroupReq(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
    20  	var gr groupReq
    21  	if ifi != nil {
    22  		gr.Interface = uint32(ifi.Index)
    23  	}
    24  	gr.setGroup(grp)
    25  	var b []byte
    26  	if compatFreeBSD32 {
    27  		var d [sizeofGroupReq + 4]byte
    28  		s := (*[sizeofGroupReq]byte)(unsafe.Pointer(&gr))
    29  		copy(d[:4], s[:4])
    30  		copy(d[8:], s[4:])
    31  		b = d[:]
    32  	} else {
    33  		b = (*[sizeofGroupReq]byte)(unsafe.Pointer(&gr))[:sizeofGroupReq]
    34  	}
    35  	return so.Set(c, b)
    36  }
    37  
    38  func (so *sockOpt) setGroupSourceReq(c *socket.Conn, ifi *net.Interface, grp, src net.IP) error {
    39  	var gsr groupSourceReq
    40  	if ifi != nil {
    41  		gsr.Interface = uint32(ifi.Index)
    42  	}
    43  	gsr.setSourceGroup(grp, src)
    44  	var b []byte
    45  	if compatFreeBSD32 {
    46  		var d [sizeofGroupSourceReq + 4]byte
    47  		s := (*[sizeofGroupSourceReq]byte)(unsafe.Pointer(&gsr))
    48  		copy(d[:4], s[:4])
    49  		copy(d[8:], s[4:])
    50  		b = d[:]
    51  	} else {
    52  		b = (*[sizeofGroupSourceReq]byte)(unsafe.Pointer(&gsr))[:sizeofGroupSourceReq]
    53  	}
    54  	return so.Set(c, b)
    55  }