1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
|
/* $OpenBSD: if_pair.c,v 1.11 2018/01/09 15:24:24 bluhm Exp $ */
/*
* Copyright (c) 2015 Reyk Floeter <reyk@openbsd.org>
* Copyright (c) 2009 Theo de Raadt <deraadt@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_media.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
void pairattach(int);
int pairioctl(struct ifnet *, u_long, caddr_t);
void pairstart(struct ifnet *);
int pair_clone_create(struct if_clone *, int);
int pair_clone_destroy(struct ifnet *);
int pair_media_change(struct ifnet *);
void pair_media_status(struct ifnet *, struct ifmediareq *);
void pair_link_state(struct ifnet *);
struct pair_softc {
struct arpcom sc_ac;
struct ifmedia sc_media;
unsigned int sc_pairedif;
};
struct if_clone pair_cloner =
IF_CLONE_INITIALIZER("pair", pair_clone_create, pair_clone_destroy);
int
pair_media_change(struct ifnet *ifp)
{
return (0);
}
void
pair_media_status(struct ifnet *ifp, struct ifmediareq *imr)
{
struct pair_softc *sc = ifp->if_softc;
struct ifnet *pairedifp;
imr->ifm_active = IFM_ETHER | IFM_AUTO;
if ((pairedifp = if_get(sc->sc_pairedif)) == NULL) {
imr->ifm_status = 0;
return;
}
if_put(pairedifp);
imr->ifm_status = IFM_AVALID | IFM_ACTIVE;
}
void
pair_link_state(struct ifnet *ifp)
{
struct pair_softc *sc = ifp->if_softc;
struct ifnet *pairedifp;
unsigned int link_state;
/* The pair state is determined by the paired interface */
if ((pairedifp = if_get(sc->sc_pairedif)) != NULL) {
link_state = LINK_STATE_UP;
if_put(pairedifp);
} else
link_state = LINK_STATE_DOWN;
if (ifp->if_link_state != link_state) {
ifp->if_link_state = link_state;
if_link_state_change(ifp);
}
}
void
pairattach(int npair)
{
if_clone_attach(&pair_cloner);
}
int
pair_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
struct pair_softc *sc;
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
ifp = &sc->sc_ac.ac_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "pair%d", unit);
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ether_fakeaddr(ifp);
ifp->if_softc = sc;
ifp->if_ioctl = pairioctl;
ifp->if_start = pairstart;
ifp->if_xflags = IFXF_CLONED;
IFQ_SET_MAXLEN(&ifp->if_snd, IFQ_MAXLEN);
ifp->if_hardmtu = ETHER_MAX_HARDMTU_LEN;
ifp->if_capabilities = IFCAP_VLAN_MTU;
ifmedia_init(&sc->sc_media, 0, pair_media_change,
pair_media_status);
ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_AUTO, 0, NULL);
ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_AUTO);
if_attach(ifp);
ether_ifattach(ifp);
pair_link_state(ifp);
return (0);
}
int
pair_clone_destroy(struct ifnet *ifp)
{
struct pair_softc *sc = ifp->if_softc;
struct ifnet *pairedifp;
struct pair_softc *dstsc = ifp->if_softc;
if ((pairedifp = if_get(sc->sc_pairedif)) != NULL) {
dstsc = pairedifp->if_softc;
dstsc->sc_pairedif = 0;
pair_link_state(pairedifp);
if_put(pairedifp);
}
ifmedia_delete_instance(&sc->sc_media, IFM_INST_ANY);
ether_ifdetach(ifp);
if_detach(ifp);
free(sc, M_DEVBUF, sizeof(*sc));
return (0);
}
void
pairstart(struct ifnet *ifp)
{
struct pair_softc *sc = (struct pair_softc *)ifp->if_softc;
struct mbuf_list ml = MBUF_LIST_INITIALIZER();
struct ifnet *pairedifp;
struct mbuf *m;
pairedifp = if_get(sc->sc_pairedif);
for (;;) {
IFQ_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
break;
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif /* NBPFILTER > 0 */
if (pairedifp != NULL) {
if (m->m_flags & M_PKTHDR)
m_resethdr(m);
ml_enqueue(&ml, m);
} else
m_freem(m);
}
if (pairedifp != NULL) {
if_input(pairedifp, &ml);
if_put(pairedifp);
}
}
int
pairioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct pair_softc *sc = (struct pair_softc *)ifp->if_softc;
struct ifreq *ifr = (struct ifreq *)data;
struct if_clone *ifc;
struct pair_softc *pairedsc = ifp->if_softc;
struct ifnet *oldifp = NULL, *newifp = NULL;
int error = 0, unit;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
/* FALLTHROUGH */
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCGIFMEDIA:
case SIOCSIFMEDIA:
error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
break;
case SIOCSIFPAIR:
if (sc->sc_pairedif == ifr->ifr_index)
break;
/* Cannot link to myself */
if (ifr->ifr_index == ifp->if_index) {
error = EINVAL;
break;
}
oldifp = if_get(sc->sc_pairedif);
newifp = if_get(ifr->ifr_index);
if (newifp != NULL) {
pairedsc = newifp->if_softc;
if (pairedsc->sc_pairedif != 0) {
error = EBUSY;
break;
}
/* Only allow pair(4) interfaces for the pair */
if ((ifc = if_clone_lookup(newifp->if_xname,
&unit)) == NULL || strcmp("pair",
ifc->ifc_name) != 0) {
error = ENODEV;
break;
}
pairedsc->sc_pairedif = ifp->if_index;
sc->sc_pairedif = ifr->ifr_index;
} else
sc->sc_pairedif = 0;
if (oldifp != NULL) {
pairedsc = oldifp->if_softc;
pairedsc->sc_pairedif = 0;
}
break;
case SIOCGIFPAIR:
ifr->ifr_index = sc->sc_pairedif;
break;
default:
error = ether_ioctl(ifp, &sc->sc_ac, cmd, data);
}
if (newifp != NULL || oldifp != NULL)
pair_link_state(ifp);
if (oldifp != NULL) {
pair_link_state(oldifp);
if_put(oldifp);
}
if (newifp != NULL) {
pair_link_state(newifp);
if_put(newifp);
}
return (error);
}
|
