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
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
|
/*
* ng_gif_demux.c
*
* Copyright 2001 The Aerospace Corporation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions, and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of The Aerospace Corporation may not be used to endorse or
* promote products derived from this software.
*
* THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* ng_gif_demux(4) netgraph node type
*
* Packets received on the "gif" hook have their type header removed
* and are passed to the appropriate hook protocol hook. Packets
* recieved on a protocol hook have a type header added back and are
* passed out the gif hook. The currently supported protocol hooks are:
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/ctype.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_gif_demux.h>
#ifdef NG_SEPARATE_MALLOC
MALLOC_DEFINE(M_NETGRAPH_GIF_DEMUX, "netgraph_gif_demux",
"netgraph gif demux node");
#else
#define M_NETGRAPH_GIF_DEMUX M_NETGRAPH
#endif
/* This struct describes one address family */
struct iffam {
sa_family_t family; /* Address family */
const char *hookname; /* Name for hook */
};
typedef const struct iffam *iffam_p;
/* List of address families supported by our interface */
const static struct iffam gFamilies[] = {
{ AF_INET, NG_GIF_DEMUX_HOOK_INET },
{ AF_INET6, NG_GIF_DEMUX_HOOK_INET6 },
{ AF_APPLETALK, NG_GIF_DEMUX_HOOK_ATALK },
{ AF_IPX, NG_GIF_DEMUX_HOOK_IPX },
{ AF_ATM, NG_GIF_DEMUX_HOOK_ATM },
{ AF_NATM, NG_GIF_DEMUX_HOOK_NATM },
{ AF_NS, NG_GIF_DEMUX_HOOK_NS },
};
#define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
/* Per-node private data */
struct ng_gif_demux_private {
node_p node; /* Our netgraph node */
hook_p gif; /* The gif hook */
hook_p hooks[NUM_FAMILIES]; /* The protocol hooks */
};
typedef struct ng_gif_demux_private *priv_p;
/* Netgraph node methods */
static ng_constructor_t ng_gif_demux_constructor;
static ng_rcvmsg_t ng_gif_demux_rcvmsg;
static ng_shutdown_t ng_gif_demux_shutdown;
static ng_newhook_t ng_gif_demux_newhook;
static ng_rcvdata_t ng_gif_demux_rcvdata;
static ng_disconnect_t ng_gif_demux_disconnect;
/* Helper stuff */
static iffam_p get_iffam_from_af(sa_family_t family);
static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
static iffam_p get_iffam_from_name(const char *name);
static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
/******************************************************************
NETGRAPH PARSE TYPES
******************************************************************/
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_gif_demux_cmdlist[] = {
{ 0 }
};
/* Node type descriptor */
static struct ng_type ng_gif_demux_typestruct = {
NG_ABI_VERSION,
NG_GIF_DEMUX_NODE_TYPE,
NULL,
ng_gif_demux_constructor,
ng_gif_demux_rcvmsg,
ng_gif_demux_shutdown,
ng_gif_demux_newhook,
NULL,
NULL,
ng_gif_demux_rcvdata,
ng_gif_demux_disconnect,
ng_gif_demux_cmdlist,
};
NETGRAPH_INIT(gif_demux, &ng_gif_demux_typestruct);
/************************************************************************
HELPER STUFF
************************************************************************/
/*
* Get the family descriptor from the family ID
*/
static __inline__ iffam_p
get_iffam_from_af(sa_family_t family)
{
iffam_p iffam;
int k;
for (k = 0; k < NUM_FAMILIES; k++) {
iffam = &gFamilies[k];
if (iffam->family == family)
return (iffam);
}
return (NULL);
}
/*
* Get the family descriptor from the hook
*/
static __inline__ iffam_p
get_iffam_from_hook(priv_p priv, hook_p hook)
{
int k;
for (k = 0; k < NUM_FAMILIES; k++)
if (priv->hooks[k] == hook)
return (&gFamilies[k]);
return (NULL);
}
/*
* Get the hook from the iffam descriptor
*/
static __inline__ hook_p *
get_hook_from_iffam(priv_p priv, iffam_p iffam)
{
return (&priv->hooks[iffam - gFamilies]);
}
/*
* Get the iffam descriptor from the name
*/
static __inline__ iffam_p
get_iffam_from_name(const char *name)
{
iffam_p iffam;
int k;
for (k = 0; k < NUM_FAMILIES; k++) {
iffam = &gFamilies[k];
if (!strcmp(iffam->hookname, name))
return (iffam);
}
return (NULL);
}
/******************************************************************
NETGRAPH NODE METHODS
******************************************************************/
/*
* Node constructor
*/
static int
ng_gif_demux_constructor(node_p node)
{
priv_p priv;
/* Allocate and initialize private info */
MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_GIF_DEMUX,
M_NOWAIT | M_ZERO);
if (priv == NULL)
return (ENOMEM);
priv->node = node;
NG_NODE_SET_PRIVATE(node, priv);
/* Done */
return (0);
}
/*
* Method for attaching a new hook
*/
static int
ng_gif_demux_newhook(node_p node, hook_p hook, const char *name)
{
const priv_p priv = NG_NODE_PRIVATE(node);
iffam_p iffam;
hook_p *hookptr;
if (strcmp(NG_GIF_DEMUX_HOOK_GIF, name) == 0)
hookptr = &priv->gif;
else {
iffam = get_iffam_from_name(name);
if (iffam == NULL)
return (EPFNOSUPPORT);
hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
}
if (*hookptr != NULL)
return (EISCONN);
*hookptr = hook;
return (0);
}
/*
* Receive a control message
*/
static int
ng_gif_demux_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
struct ng_mesg *resp = NULL;
int error = 0;
struct ng_mesg *msg;
NGI_GET_MSG(item, msg);
switch (msg->header.typecookie) {
case NGM_GIF_DEMUX_COOKIE:
switch (msg->header.cmd) {
/* XXX: Add commands here. */
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
/* Done */
NG_RESPOND_MSG(error, node, item, resp);
NG_FREE_MSG(msg);
return (error);
}
/*
* Receive data on a hook
*/
static int
ng_gif_demux_rcvdata(hook_p hook, item_p item)
{
const node_p node = NG_HOOK_NODE(hook);
const priv_p priv = NG_NODE_PRIVATE(node);
iffam_p iffam;
hook_p outhook;
int error = 0;
struct mbuf *m;
/* Pull the mbuf out of the item for processing. */
NGI_GET_M(item, m);
if (hook == priv->gif) {
/*
* Pull off the address family header and find the
* output hook.
*/
if (m->m_pkthdr.len < sizeof(sa_family_t)) {
NG_FREE_M(m);
NG_FREE_ITEM(item);
return (EINVAL);
}
if (m->m_len < sizeof(sa_family_t)
&& (m = m_pullup(m, sizeof(sa_family_t))) == NULL) {
NG_FREE_ITEM(item);
return (ENOBUFS);
}
iffam = get_iffam_from_af(*mtod(m, sa_family_t *));
if (iffam == NULL) {
NG_FREE_M(m);
NG_FREE_ITEM(item);
return (EINVAL);
}
outhook = *get_hook_from_iffam(priv, iffam);
m_adj(m, sizeof(sa_family_t));
} else {
/*
* Add address family header and set the output hook.
*/
iffam = get_iffam_from_hook(priv, hook);
M_PREPEND(m, sizeof (iffam->family), M_DONTWAIT);
if (m == NULL) {
NG_FREE_M(m);
NG_FREE_ITEM(item);
return (ENOBUFS);
}
bcopy(&iffam->family, mtod(m, sa_family_t *),
sizeof(iffam->family));
outhook = priv->gif;
}
/* Stuff the mbuf back in. */
NGI_M(item) = m;
/* Deliver packet */
NG_FWD_ITEM_HOOK(error, item, outhook);
return (error);
}
/*
* Shutdown node
*/
static int
ng_gif_demux_shutdown(node_p node)
{
const priv_p priv = NG_NODE_PRIVATE(node);
FREE(priv, M_NETGRAPH_GIF_DEMUX);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
return (0);
}
/*
* Hook disconnection.
*/
static int
ng_gif_demux_disconnect(hook_p hook)
{
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
iffam_p iffam;
if (hook == priv->gif)
priv->gif = NULL;
else {
iffam = get_iffam_from_hook(priv, hook);
if (iffam == NULL)
panic(__func__);
*get_hook_from_iffam(priv, iffam) = NULL;
}
return (0);
}
|