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sockopt_posix.go (2311B)

      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 //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows || zos
      6 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows zos
      7 
      8 package ipv6
      9 
     10 import (
     11 	"net"
     12 	"runtime"
     13 	"unsafe"
     14 
     15 	"golang.org/x/net/bpf"
     16 	"golang.org/x/net/internal/socket"
     17 )
     18 
     19 func (so *sockOpt) getMulticastInterface(c *socket.Conn) (*net.Interface, error) {
     20 	n, err := so.GetInt(c)
     21 	if err != nil {
     22 		return nil, err
     23 	}
     24 	return net.InterfaceByIndex(n)
     25 }
     26 
     27 func (so *sockOpt) setMulticastInterface(c *socket.Conn, ifi *net.Interface) error {
     28 	var n int
     29 	if ifi != nil {
     30 		n = ifi.Index
     31 	}
     32 	return so.SetInt(c, n)
     33 }
     34 
     35 func (so *sockOpt) getICMPFilter(c *socket.Conn) (*ICMPFilter, error) {
     36 	b := make([]byte, so.Len)
     37 	n, err := so.Get(c, b)
     38 	if err != nil {
     39 		return nil, err
     40 	}
     41 	if n != sizeofICMPv6Filter {
     42 		return nil, errNotImplemented
     43 	}
     44 	return (*ICMPFilter)(unsafe.Pointer(&b[0])), nil
     45 }
     46 
     47 func (so *sockOpt) setICMPFilter(c *socket.Conn, f *ICMPFilter) error {
     48 	b := (*[sizeofICMPv6Filter]byte)(unsafe.Pointer(f))[:sizeofICMPv6Filter]
     49 	return so.Set(c, b)
     50 }
     51 
     52 func (so *sockOpt) getMTUInfo(c *socket.Conn) (*net.Interface, int, error) {
     53 	b := make([]byte, so.Len)
     54 	n, err := so.Get(c, b)
     55 	if err != nil {
     56 		return nil, 0, err
     57 	}
     58 	if n != sizeofIPv6Mtuinfo {
     59 		return nil, 0, errNotImplemented
     60 	}
     61 	mi := (*ipv6Mtuinfo)(unsafe.Pointer(&b[0]))
     62 	if mi.Addr.Scope_id == 0 || runtime.GOOS == "aix" {
     63 		// AIX kernel might return a wrong address.
     64 		return nil, int(mi.Mtu), nil
     65 	}
     66 	ifi, err := net.InterfaceByIndex(int(mi.Addr.Scope_id))
     67 	if err != nil {
     68 		return nil, 0, err
     69 	}
     70 	return ifi, int(mi.Mtu), nil
     71 }
     72 
     73 func (so *sockOpt) setGroup(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
     74 	switch so.typ {
     75 	case ssoTypeIPMreq:
     76 		return so.setIPMreq(c, ifi, grp)
     77 	case ssoTypeGroupReq:
     78 		return so.setGroupReq(c, ifi, grp)
     79 	default:
     80 		return errNotImplemented
     81 	}
     82 }
     83 
     84 func (so *sockOpt) setSourceGroup(c *socket.Conn, ifi *net.Interface, grp, src net.IP) error {
     85 	return so.setGroupSourceReq(c, ifi, grp, src)
     86 }
     87 
     88 func (so *sockOpt) setBPF(c *socket.Conn, f []bpf.RawInstruction) error {
     89 	return so.setAttachFilter(c, f)
     90 }