1
2/*
3 * ng_rfc1490.c
4 *
5 * Copyright (c) 1996-1999 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
18 *
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * Author: Julian Elischer <julian@freebsd.org>
38 *
|
39 * $FreeBSD: head/sys/netgraph/ng_rfc1490.c 68876 2000-11-18 15:17:43Z dwmalone $
|
| 39 * $FreeBSD: head/sys/netgraph/ng_rfc1490.c 69922 2000-12-12 18:52:14Z julian $ |
40 * $Whistle: ng_rfc1490.c,v 1.22 1999/11/01 09:24:52 julian Exp $
41 */
42
43/*
44 * This node does RFC 1490 multiplexing.
45 *
46 * NOTE: RFC 1490 is updated by RFC 2427.
47 */
48
49#include <sys/param.h>
50#include <sys/systm.h>
51#include <sys/errno.h>
52#include <sys/kernel.h>
53#include <sys/malloc.h>
54#include <sys/mbuf.h>
55#include <sys/errno.h>
56#include <sys/socket.h>
57
58#include <net/if.h>
59#include <netinet/in.h>
60#include <netinet/if_ether.h>
61
62#include <netgraph/ng_message.h>
63#include <netgraph/netgraph.h>
64#include <netgraph/ng_rfc1490.h>
65
66/*
67 * DEFINITIONS
68 */
69
70/* Q.922 stuff -- see RFC 1490 */
71#define HDLC_UI 0x03
72
73#define NLPID_IP 0xCC
74#define NLPID_PPP 0xCF
75#define NLPID_SNAP 0x80
76#define NLPID_Q933 0x08
77#define NLPID_CLNP 0x81
78#define NLPID_ESIS 0x82
79#define NLPID_ISIS 0x83
80
81/* Node private data */
82struct ng_rfc1490_private {
83 hook_p downlink;
84 hook_p ppp;
85 hook_p inet;
86};
87typedef struct ng_rfc1490_private *priv_p;
88
89/* Netgraph node methods */
90static ng_constructor_t ng_rfc1490_constructor;
91static ng_rcvmsg_t ng_rfc1490_rcvmsg;
92static ng_shutdown_t ng_rfc1490_rmnode;
93static ng_newhook_t ng_rfc1490_newhook;
94static ng_rcvdata_t ng_rfc1490_rcvdata;
95static ng_disconnect_t ng_rfc1490_disconnect;
96
97/* Node type descriptor */
98static struct ng_type typestruct = {
99 NG_VERSION,
100 NG_RFC1490_NODE_TYPE,
101 NULL,
102 ng_rfc1490_constructor,
103 ng_rfc1490_rcvmsg,
104 ng_rfc1490_rmnode,
105 ng_rfc1490_newhook,
106 NULL,
107 NULL,
108 ng_rfc1490_rcvdata,
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109 ng_rfc1490_rcvdata,
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109 ng_rfc1490_disconnect,
110 NULL
111};
112NETGRAPH_INIT(rfc1490, &typestruct);
113
114/************************************************************************
115 NETGRAPH NODE STUFF
116 ************************************************************************/
117
118/*
119 * Node constructor
120 */
121static int
122ng_rfc1490_constructor(node_p *nodep)
123{
124 priv_p priv;
125 int error;
126
127 /* Allocate private structure */
128 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
129 if (priv == NULL)
130 return (ENOMEM);
131
132 /* Call generic node constructor */
133 if ((error = ng_make_node_common(&typestruct, nodep))) {
134 FREE(priv, M_NETGRAPH);
135 return (error);
136 }
137 (*nodep)->private = priv;
138
139 /* Done */
140 return (0);
141}
142
143/*
144 * Give our ok for a hook to be added
145 */
146static int
147ng_rfc1490_newhook(node_p node, hook_p hook, const char *name)
148{
149 const priv_p priv = node->private;
150
151 if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) {
152 if (priv->downlink)
153 return (EISCONN);
154 priv->downlink = hook;
155 } else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) {
156 if (priv->ppp)
157 return (EISCONN);
158 priv->ppp = hook;
159 } else if (!strcmp(name, NG_RFC1490_HOOK_INET)) {
160 if (priv->inet)
161 return (EISCONN);
162 priv->inet = hook;
163 } else
164 return (EINVAL);
165 return (0);
166}
167
168/*
169 * Receive a control message. We don't support any special ones.
170 */
171static int
172ng_rfc1490_rcvmsg(node_p node, struct ng_mesg *msg,
173 const char *raddr, struct ng_mesg **rp, hook_p lasthook)
174{
175 FREE(msg, M_NETGRAPH);
176 return (EINVAL);
177}
178
179/*
180 * Receive data on a hook and encapsulate according to RFC 1490.
181 * Only those nodes marked (*) are supported by this routine so far.
182 *
183 * Q.922 control
184 * |
185 * |
186 * --------------------------------------------
187 * | 0x03 |
188 * UI I Frame
189 * | |
190 * --------------------------------- --------------
191 * | 0x08 | 0x81 |0xCC |0xCF | 0x00 |..01.... |..10....
192 * | | | | | 0x80 | |
193 * Q.933 CLNP IP(*) PPP(*) SNAP ISO 8208 ISO 8208
194 * | (rfc1973) | Modulo 8 Modulo 128
195 * | |
196 * -------------------- OUI
197 * | | |
198 * L2 ID L3 ID -------------------------
199 * | User |00-80-C2 |00-00-00
200 * | specified | |
201 * | 0x70 PID Ethertype
202 * | | |
203 * ------------------- --------------... ----------
204 * |0x51 |0x4E | |0x4C |0x1 |0xB | |0x806 |
205 * | | | | | | | | |
206 * 7776 Q.922 Others 802.2 802.3 802.6 Others ARP(*) Others
207 *
208 *
209 */
210
211#define MAX_ENCAPS_HDR 8
212#define ERROUT(x) do { error = (x); goto done; } while (0)
213#define OUICMP(P,A,B,C) ((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C))
214
215static int
216ng_rfc1490_rcvdata(hook_p hook, struct mbuf *m, meta_p meta,
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218 struct mbuf **ret_m, meta_p *ret_meta)
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| 217 struct mbuf **ret_m, meta_p *ret_meta, struct ng_mesg **resp) |
218{
219 const node_p node = hook->node;
220 const priv_p priv = node->private;
221 int error = 0;
222
223 if (hook == priv->downlink) {
224 u_char *start, *ptr;
225
226 if (!m || (m->m_len < MAX_ENCAPS_HDR
227 && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
228 ERROUT(ENOBUFS);
229 ptr = start = mtod(m, u_char *);
230
231 /* Must be UI frame */
232 if (*ptr++ != HDLC_UI)
233 ERROUT(0);
234
235 /* Eat optional zero pad byte */
236 if (*ptr == 0x00)
237 ptr++;
238
239 /* Multiplex on NLPID */
240 switch (*ptr++) {
241 case NLPID_SNAP:
242 if (OUICMP(ptr, 0, 0, 0)) { /* It's an ethertype */
243 u_int16_t etype;
244
245 ptr += 3;
246 etype = ntohs(*((u_int16_t *) ptr));
247 ptr += 2;
248 m_adj(m, ptr - start);
249 switch (etype) {
250 case ETHERTYPE_IP:
251 NG_SEND_DATA(error,
252 priv->inet, m, meta);
253 break;
254 case ETHERTYPE_ARP:
255 case ETHERTYPE_REVARP:
256 default:
257 ERROUT(0);
258 }
259 } else if (OUICMP(ptr, 0x00, 0x80, 0xc2)) /* 802.1 bridging */
260 ERROUT(0);
261 else /* Other weird stuff... */
262 ERROUT(0);
263 break;
264 case NLPID_IP:
265 m_adj(m, ptr - start);
266 NG_SEND_DATA(error, priv->inet, m, meta);
267 break;
268 case NLPID_PPP:
269 m_adj(m, ptr - start);
270 NG_SEND_DATA(error, priv->ppp, m, meta);
271 break;
272 case NLPID_Q933:
273 case NLPID_CLNP:
274 case NLPID_ESIS:
275 case NLPID_ISIS:
276 ERROUT(0);
277 default: /* Try PPP (see RFC 1973) */
278 ptr--; /* NLPID becomes PPP proto */
279 if ((*ptr & 0x01) == 0x01)
280 ERROUT(0);
281 m_adj(m, ptr - start);
282 NG_SEND_DATA(error, priv->ppp, m, meta);
283 break;
284 }
285 } else if (hook == priv->ppp) {
286 M_PREPEND(m, 2, M_DONTWAIT); /* Prepend PPP NLPID */
287 if (!m)
288 ERROUT(ENOBUFS);
289 mtod(m, u_char *)[0] = HDLC_UI;
290 mtod(m, u_char *)[1] = NLPID_PPP;
291 NG_SEND_DATA(error, priv->downlink, m, meta);
292 } else if (hook == priv->inet) {
293 M_PREPEND(m, 2, M_DONTWAIT); /* Prepend IP NLPID */
294 if (!m)
295 ERROUT(ENOBUFS);
296 mtod(m, u_char *)[0] = HDLC_UI;
297 mtod(m, u_char *)[1] = NLPID_IP;
298 NG_SEND_DATA(error, priv->downlink, m, meta);
299 } else
300 panic(__FUNCTION__);
301
302done:
303 NG_FREE_DATA(m, meta);
304 return (error);
305}
306
307/*
308 * Nuke node
309 */
310static int
311ng_rfc1490_rmnode(node_p node)
312{
313 const priv_p priv = node->private;
314
315 /* Take down netgraph node */
316 node->flags |= NG_INVALID;
317 ng_cutlinks(node);
318 ng_unname(node);
319 bzero(priv, sizeof(*priv));
320 node->private = NULL;
321 ng_unref(node); /* let the node escape */
322 return (0);
323}
324
325/*
326 * Hook disconnection
327 */
328static int
329ng_rfc1490_disconnect(hook_p hook)
330{
331 const priv_p priv = hook->node->private;
332
333 if (hook->node->numhooks == 0)
334 ng_rmnode(hook->node);
335 else if (hook == priv->downlink)
336 priv->downlink = NULL;
337 else if (hook == priv->inet)
338 priv->inet = NULL;
339 else if (hook == priv->ppp)
340 priv->ppp = NULL;
341 else
342 panic(__FUNCTION__);
343 return (0);
344}
345
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