1// Copyright 2016 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 solaris
6// +build solaris
7
8package lif
9
10import "unsafe"
11
12// A Link represents logical data link information.
13//
14// It also represents base information for logical network interface.
15// On Solaris, each logical network interface represents network layer
16// adjacency information and the interface has a only single network
17// address or address pair for tunneling. It's usual that multiple
18// logical network interfaces share the same logical data link.
19type Link struct {
20	Name  string // name, equivalent to IP interface name
21	Index int    // index, equivalent to IP interface index
22	Type  int    // type
23	Flags int    // flags
24	MTU   int    // maximum transmission unit, basically link MTU but may differ between IP address families
25	Addr  []byte // address
26}
27
28func (ll *Link) fetch(s uintptr) {
29	var lifr lifreq
30	for i := 0; i < len(ll.Name); i++ {
31		lifr.Name[i] = int8(ll.Name[i])
32	}
33	ioc := int64(sysSIOCGLIFINDEX)
34	if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
35		ll.Index = int(nativeEndian.Uint32(lifr.Lifru[:4]))
36	}
37	ioc = int64(sysSIOCGLIFFLAGS)
38	if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
39		ll.Flags = int(nativeEndian.Uint64(lifr.Lifru[:8]))
40	}
41	ioc = int64(sysSIOCGLIFMTU)
42	if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
43		ll.MTU = int(nativeEndian.Uint32(lifr.Lifru[:4]))
44	}
45	switch ll.Type {
46	case sysIFT_IPV4, sysIFT_IPV6, sysIFT_6TO4:
47	default:
48		ioc = int64(sysSIOCGLIFHWADDR)
49		if err := ioctl(s, uintptr(ioc), unsafe.Pointer(&lifr)); err == nil {
50			ll.Addr, _ = parseLinkAddr(lifr.Lifru[4:])
51		}
52	}
53}
54
55// Links returns a list of logical data links.
56//
57// The provided af must be an address family and name must be a data
58// link name. The zero value of af or name means a wildcard.
59func Links(af int, name string) ([]Link, error) {
60	eps, err := newEndpoints(af)
61	if len(eps) == 0 {
62		return nil, err
63	}
64	defer func() {
65		for _, ep := range eps {
66			ep.close()
67		}
68	}()
69	return links(eps, name)
70}
71
72func links(eps []endpoint, name string) ([]Link, error) {
73	var lls []Link
74	lifn := lifnum{Flags: sysLIFC_NOXMIT | sysLIFC_TEMPORARY | sysLIFC_ALLZONES | sysLIFC_UNDER_IPMP}
75	lifc := lifconf{Flags: sysLIFC_NOXMIT | sysLIFC_TEMPORARY | sysLIFC_ALLZONES | sysLIFC_UNDER_IPMP}
76	for _, ep := range eps {
77		lifn.Family = uint16(ep.af)
78		ioc := int64(sysSIOCGLIFNUM)
79		if err := ioctl(ep.s, uintptr(ioc), unsafe.Pointer(&lifn)); err != nil {
80			continue
81		}
82		if lifn.Count == 0 {
83			continue
84		}
85		b := make([]byte, lifn.Count*sizeofLifreq)
86		lifc.Family = uint16(ep.af)
87		lifc.Len = lifn.Count * sizeofLifreq
88		if len(lifc.Lifcu) == 8 {
89			nativeEndian.PutUint64(lifc.Lifcu[:], uint64(uintptr(unsafe.Pointer(&b[0]))))
90		} else {
91			nativeEndian.PutUint32(lifc.Lifcu[:], uint32(uintptr(unsafe.Pointer(&b[0]))))
92		}
93		ioc = int64(sysSIOCGLIFCONF)
94		if err := ioctl(ep.s, uintptr(ioc), unsafe.Pointer(&lifc)); err != nil {
95			continue
96		}
97		nb := make([]byte, 32) // see LIFNAMSIZ in net/if.h
98		for i := 0; i < int(lifn.Count); i++ {
99			lifr := (*lifreq)(unsafe.Pointer(&b[i*sizeofLifreq]))
100			for i := 0; i < 32; i++ {
101				if lifr.Name[i] == 0 {
102					nb = nb[:i]
103					break
104				}
105				nb[i] = byte(lifr.Name[i])
106			}
107			llname := string(nb)
108			nb = nb[:32]
109			if isDupLink(lls, llname) || name != "" && name != llname {
110				continue
111			}
112			ll := Link{Name: llname, Type: int(lifr.Type)}
113			ll.fetch(ep.s)
114			lls = append(lls, ll)
115		}
116	}
117	return lls, nil
118}
119
120func isDupLink(lls []Link, name string) bool {
121	for _, ll := range lls {
122		if ll.Name == name {
123			return true
124		}
125	}
126	return false
127}
128