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 || zos
6// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
7
8package ipv6
9
10import (
11	"net"
12	"unsafe"
13
14	"golang.org/x/net/internal/iana"
15	"golang.org/x/net/internal/socket"
16
17	"golang.org/x/sys/unix"
18)
19
20func marshalTrafficClass(b []byte, cm *ControlMessage) []byte {
21	m := socket.ControlMessage(b)
22	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_TCLASS, 4)
23	if cm != nil {
24		socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.TrafficClass))
25	}
26	return m.Next(4)
27}
28
29func parseTrafficClass(cm *ControlMessage, b []byte) {
30	cm.TrafficClass = int(socket.NativeEndian.Uint32(b[:4]))
31}
32
33func marshalHopLimit(b []byte, cm *ControlMessage) []byte {
34	m := socket.ControlMessage(b)
35	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_HOPLIMIT, 4)
36	if cm != nil {
37		socket.NativeEndian.PutUint32(m.Data(4), uint32(cm.HopLimit))
38	}
39	return m.Next(4)
40}
41
42func parseHopLimit(cm *ControlMessage, b []byte) {
43	cm.HopLimit = int(socket.NativeEndian.Uint32(b[:4]))
44}
45
46func marshalPacketInfo(b []byte, cm *ControlMessage) []byte {
47	m := socket.ControlMessage(b)
48	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_PKTINFO, sizeofInet6Pktinfo)
49	if cm != nil {
50		pi := (*inet6Pktinfo)(unsafe.Pointer(&m.Data(sizeofInet6Pktinfo)[0]))
51		if ip := cm.Src.To16(); ip != nil && ip.To4() == nil {
52			copy(pi.Addr[:], ip)
53		}
54		if cm.IfIndex > 0 {
55			pi.setIfindex(cm.IfIndex)
56		}
57	}
58	return m.Next(sizeofInet6Pktinfo)
59}
60
61func parsePacketInfo(cm *ControlMessage, b []byte) {
62	pi := (*inet6Pktinfo)(unsafe.Pointer(&b[0]))
63	if len(cm.Dst) < net.IPv6len {
64		cm.Dst = make(net.IP, net.IPv6len)
65	}
66	copy(cm.Dst, pi.Addr[:])
67	cm.IfIndex = int(pi.Ifindex)
68}
69
70func marshalNextHop(b []byte, cm *ControlMessage) []byte {
71	m := socket.ControlMessage(b)
72	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_NEXTHOP, sizeofSockaddrInet6)
73	if cm != nil {
74		sa := (*sockaddrInet6)(unsafe.Pointer(&m.Data(sizeofSockaddrInet6)[0]))
75		sa.setSockaddr(cm.NextHop, cm.IfIndex)
76	}
77	return m.Next(sizeofSockaddrInet6)
78}
79
80func parseNextHop(cm *ControlMessage, b []byte) {
81}
82
83func marshalPathMTU(b []byte, cm *ControlMessage) []byte {
84	m := socket.ControlMessage(b)
85	m.MarshalHeader(iana.ProtocolIPv6, unix.IPV6_PATHMTU, sizeofIPv6Mtuinfo)
86	return m.Next(sizeofIPv6Mtuinfo)
87}
88
89func parsePathMTU(cm *ControlMessage, b []byte) {
90	mi := (*ipv6Mtuinfo)(unsafe.Pointer(&b[0]))
91	if len(cm.Dst) < net.IPv6len {
92		cm.Dst = make(net.IP, net.IPv6len)
93	}
94	copy(cm.Dst, mi.Addr.Addr[:])
95	cm.IfIndex = int(mi.Addr.Scope_id)
96	cm.MTU = int(mi.Mtu)
97}
98