github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/net/ipv6/sockopt_unix.go (about)

     1  // Copyright 2013 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  // +build darwin dragonfly freebsd linux netbsd openbsd
     6  
     7  package ipv6
     8  
     9  import (
    10  	"net"
    11  	"os"
    12  	"unsafe"
    13  )
    14  
    15  func getInt(fd int, opt *sockOpt) (int, error) {
    16  	if opt.name < 1 || opt.typ != ssoTypeInt {
    17  		return 0, errOpNoSupport
    18  	}
    19  	var i int32
    20  	l := sysSockoptLen(4)
    21  	if err := getsockopt(fd, opt.level, opt.name, unsafe.Pointer(&i), &l); err != nil {
    22  		return 0, os.NewSyscallError("getsockopt", err)
    23  	}
    24  	return int(i), nil
    25  }
    26  
    27  func setInt(fd int, opt *sockOpt, v int) error {
    28  	if opt.name < 1 || opt.typ != ssoTypeInt {
    29  		return errOpNoSupport
    30  	}
    31  	i := int32(v)
    32  	return os.NewSyscallError("setsockopt", setsockopt(fd, opt.level, opt.name, unsafe.Pointer(&i), sysSockoptLen(4)))
    33  }
    34  
    35  func getInterface(fd int, opt *sockOpt) (*net.Interface, error) {
    36  	if opt.name < 1 || opt.typ != ssoTypeInterface {
    37  		return nil, errOpNoSupport
    38  	}
    39  	var i int32
    40  	l := sysSockoptLen(4)
    41  	if err := getsockopt(fd, opt.level, opt.name, unsafe.Pointer(&i), &l); err != nil {
    42  		return nil, os.NewSyscallError("getsockopt", err)
    43  	}
    44  	if i == 0 {
    45  		return nil, nil
    46  	}
    47  	ifi, err := net.InterfaceByIndex(int(i))
    48  	if err != nil {
    49  		return nil, err
    50  	}
    51  	return ifi, nil
    52  }
    53  
    54  func setInterface(fd int, opt *sockOpt, ifi *net.Interface) error {
    55  	if opt.name < 1 || opt.typ != ssoTypeInterface {
    56  		return errOpNoSupport
    57  	}
    58  	var i int32
    59  	if ifi != nil {
    60  		i = int32(ifi.Index)
    61  	}
    62  	return os.NewSyscallError("setsockopt", setsockopt(fd, opt.level, opt.name, unsafe.Pointer(&i), sysSockoptLen(4)))
    63  }
    64  
    65  func getICMPFilter(fd int, opt *sockOpt) (*ICMPFilter, error) {
    66  	if opt.name < 1 || opt.typ != ssoTypeICMPFilter {
    67  		return nil, errOpNoSupport
    68  	}
    69  	var f ICMPFilter
    70  	l := sysSockoptLen(sysSizeofICMPv6Filter)
    71  	if err := getsockopt(fd, opt.level, opt.name, unsafe.Pointer(&f.sysICMPv6Filter), &l); err != nil {
    72  		return nil, os.NewSyscallError("getsockopt", err)
    73  	}
    74  	return &f, nil
    75  }
    76  
    77  func setICMPFilter(fd int, opt *sockOpt, f *ICMPFilter) error {
    78  	if opt.name < 1 || opt.typ != ssoTypeICMPFilter {
    79  		return errOpNoSupport
    80  	}
    81  	return os.NewSyscallError("setsockopt", setsockopt(fd, opt.level, opt.name, unsafe.Pointer(&f.sysICMPv6Filter), sysSizeofICMPv6Filter))
    82  }
    83  
    84  func getMTUInfo(fd int, opt *sockOpt) (*net.Interface, int, error) {
    85  	if opt.name < 1 || opt.typ != ssoTypeMTUInfo {
    86  		return nil, 0, errOpNoSupport
    87  	}
    88  	var mi sysIPv6Mtuinfo
    89  	l := sysSockoptLen(sysSizeofIPv6Mtuinfo)
    90  	if err := getsockopt(fd, opt.level, opt.name, unsafe.Pointer(&mi), &l); err != nil {
    91  		return nil, 0, os.NewSyscallError("getsockopt", err)
    92  	}
    93  	if mi.Addr.Scope_id == 0 {
    94  		return nil, int(mi.Mtu), nil
    95  	}
    96  	ifi, err := net.InterfaceByIndex(int(mi.Addr.Scope_id))
    97  	if err != nil {
    98  		return nil, 0, err
    99  	}
   100  	return ifi, int(mi.Mtu), nil
   101  }
   102  
   103  func setGroup(fd int, opt *sockOpt, ifi *net.Interface, grp net.IP) error {
   104  	if opt.name < 1 {
   105  		return errOpNoSupport
   106  	}
   107  	switch opt.typ {
   108  	case ssoTypeIPMreq:
   109  		return setsockoptIPMreq(fd, opt, ifi, grp)
   110  	case ssoTypeGroupReq:
   111  		return setsockoptGroupReq(fd, opt, ifi, grp)
   112  	default:
   113  		return errOpNoSupport
   114  	}
   115  }
   116  
   117  func setSourceGroup(fd int, opt *sockOpt, ifi *net.Interface, grp, src net.IP) error {
   118  	if opt.name < 1 || opt.typ != ssoTypeGroupSourceReq {
   119  		return errOpNoSupport
   120  	}
   121  	return setsockoptGroupSourceReq(fd, opt, ifi, grp, src)
   122  }