golang.org/x/net@v0.25.1-0.20240516223405-c87a5b62e243/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  
     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  }