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: releng/5.1/sys/netgraph/ng_rfc1490.c 111119 2003-02-19 05:47:46Z imp $
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 */
82 struct ng_rfc1490_private {
83 hook_p downlink;
84 hook_p ppp;
85 hook_p inet;
86 };
87 typedef struct ng_rfc1490_private *priv_p;
88
89 /* Netgraph node methods */
90 static ng_constructor_t ng_rfc1490_constructor;
91 static ng_rcvmsg_t ng_rfc1490_rcvmsg;
92 static ng_shutdown_t ng_rfc1490_shutdown;
93 static ng_newhook_t ng_rfc1490_newhook;
94 static ng_rcvdata_t ng_rfc1490_rcvdata;
95 static ng_disconnect_t ng_rfc1490_disconnect;
96
97 /* Node type descriptor */
98 static struct ng_type typestruct = {
99 NG_ABI_VERSION,
100 NG_RFC1490_NODE_TYPE,
101 NULL,
102 ng_rfc1490_constructor,
103 ng_rfc1490_rcvmsg,
104 ng_rfc1490_shutdown,
105 ng_rfc1490_newhook,
106 NULL,
107 NULL,
108 ng_rfc1490_rcvdata,
109 ng_rfc1490_disconnect,
110 NULL
111 };
112 NETGRAPH_INIT(rfc1490, &typestruct);
113
114 /************************************************************************
115 NETGRAPH NODE STUFF
116 ************************************************************************/
117
118 /*
119 * Node constructor
120 */
121 static int
122 ng_rfc1490_constructor(node_p node)
123 {
124 priv_p priv;
125
126 /* Allocate private structure */
127 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
128 if (priv == NULL)
129 return (ENOMEM);
130
131 NG_NODE_SET_PRIVATE(node, priv);
132
133 /* Done */
134 return (0);
135 }
136
137 /*
138 * Give our ok for a hook to be added
139 */
140 static int
141 ng_rfc1490_newhook(node_p node, hook_p hook, const char *name)
142 {
143 const priv_p priv = NG_NODE_PRIVATE(node);
144
145 if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) {
146 if (priv->downlink)
147 return (EISCONN);
148 priv->downlink = hook;
149 } else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) {
150 if (priv->ppp)
151 return (EISCONN);
152 priv->ppp = hook;
153 } else if (!strcmp(name, NG_RFC1490_HOOK_INET)) {
154 if (priv->inet)
155 return (EISCONN);
156 priv->inet = hook;
157 } else
158 return (EINVAL);
159 return (0);
160 }
161
162 /*
163 * Receive a control message. We don't support any special ones.
164 */
165 static int
166 ng_rfc1490_rcvmsg(node_p node, item_p item, hook_p lasthook)
167 {
168 NG_FREE_ITEM(item);
169 return (EINVAL);
170 }
171
172 /*
173 * Receive data on a hook and encapsulate according to RFC 1490.
174 * Only those nodes marked (*) are supported by this routine so far.
175 *
176 * Q.922 control
177 * |
178 * |
179 * --------------------------------------------
180 * | 0x03 |
181 * UI I Frame
182 * | |
183 * --------------------------------- --------------
184 * | 0x08 | 0x81 |0xCC |0xCF | 0x00 |..01.... |..10....
185 * | | | | | 0x80 | |
186 * Q.933 CLNP IP(*) PPP(*) SNAP ISO 8208 ISO 8208
187 * | (rfc1973) | Modulo 8 Modulo 128
188 * | |
189 * -------------------- OUI
190 * | | |
191 * L2 ID L3 ID -------------------------
192 * | User |00-80-C2 |00-00-00
193 * | specified | |
194 * | 0x70 PID Ethertype
195 * | | |
196 * ------------------- --------------... ----------
197 * |0x51 |0x4E | |0x4C |0x1 |0xB | |0x806 |
198 * | | | | | | | | |
199 * 7776 Q.922 Others 802.2 802.3 802.6 Others ARP(*) Others
200 *
201 *
202 */
203
204 #define MAX_ENCAPS_HDR 8
205 #define ERROUT(x) do { error = (x); goto done; } while (0)
206 #define OUICMP(P,A,B,C) ((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C))
207
208 static int
209 ng_rfc1490_rcvdata(hook_p hook, item_p item)
210 {
211 const node_p node = NG_HOOK_NODE(hook);
212 const priv_p priv = NG_NODE_PRIVATE(node);
213 int error = 0;
214 struct mbuf *m;
215
216 NGI_GET_M(item, m);
217 if (hook == priv->downlink) {
218 const u_char *start;
219 const u_char *ptr;
220
221 if (!m || (m->m_len < MAX_ENCAPS_HDR
222 && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
223 ERROUT(ENOBUFS);
224 ptr = start = mtod(m, const u_char *);
225
226 /* Must be UI frame */
227 if (*ptr++ != HDLC_UI)
228 ERROUT(0);
229
230 /* Eat optional zero pad byte */
231 if (*ptr == 0x00)
232 ptr++;
233
234 /* Multiplex on NLPID */
235 switch (*ptr++) {
236 case NLPID_SNAP:
237 if (OUICMP(ptr, 0, 0, 0)) { /* It's an ethertype */
238 u_int16_t etype;
239
240 ptr += 3;
241 etype = ntohs(*((const u_int16_t *)ptr));
242 ptr += 2;
243 m_adj(m, ptr - start);
244 switch (etype) {
245 case ETHERTYPE_IP:
246 NG_FWD_NEW_DATA(error, item,
247 priv->inet, m);
248 break;
249 case ETHERTYPE_ARP:
250 case ETHERTYPE_REVARP:
251 default:
252 ERROUT(0);
253 }
254 } else if (OUICMP(ptr, 0x00, 0x80, 0xc2)) /* 802.1 bridging */
255 ERROUT(0);
256 else /* Other weird stuff... */
257 ERROUT(0);
258 break;
259 case NLPID_IP:
260 m_adj(m, ptr - start);
261 NG_FWD_NEW_DATA(error, item, priv->inet, m);
262 break;
263 case NLPID_PPP:
264 m_adj(m, ptr - start);
265 NG_FWD_NEW_DATA(error, item, priv->ppp, m);
266 break;
267 case NLPID_Q933:
268 case NLPID_CLNP:
269 case NLPID_ESIS:
270 case NLPID_ISIS:
271 ERROUT(0);
272 default: /* Try PPP (see RFC 1973) */
273 ptr--; /* NLPID becomes PPP proto */
274 if ((*ptr & 0x01) == 0x01)
275 ERROUT(0);
276 m_adj(m, ptr - start);
277 NG_FWD_NEW_DATA(error, item, priv->ppp, m);
278 break;
279 }
280 } else if (hook == priv->ppp) {
281 M_PREPEND(m, 2, M_DONTWAIT); /* Prepend PPP NLPID */
282 if (!m)
283 ERROUT(ENOBUFS);
284 mtod(m, u_char *)[0] = HDLC_UI;
285 mtod(m, u_char *)[1] = NLPID_PPP;
286 NG_FWD_NEW_DATA(error, item, priv->downlink, m);
287 } else if (hook == priv->inet) {
288 M_PREPEND(m, 2, M_DONTWAIT); /* Prepend IP NLPID */
289 if (!m)
290 ERROUT(ENOBUFS);
291 mtod(m, u_char *)[0] = HDLC_UI;
292 mtod(m, u_char *)[1] = NLPID_IP;
293 NG_FWD_NEW_DATA(error, item, priv->downlink, m);
294 } else
295 panic(__func__);
296
297 done:
298 if (item)
299 NG_FREE_ITEM(item);
300 NG_FREE_M(m);
301 return (error);
302 }
303
304 /*
305 * Nuke node
306 */
307 static int
308 ng_rfc1490_shutdown(node_p node)
309 {
310 const priv_p priv = NG_NODE_PRIVATE(node);
311
312 /* Take down netgraph node */
313 bzero(priv, sizeof(*priv));
314 FREE(priv, M_NETGRAPH);
315 NG_NODE_SET_PRIVATE(node, NULL);
316 NG_NODE_UNREF(node); /* let the node escape */
317 return (0);
318 }
319
320 /*
321 * Hook disconnection
322 */
323 static int
324 ng_rfc1490_disconnect(hook_p hook)
325 {
326 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
327
328 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
329 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
330 ng_rmnode_self(NG_HOOK_NODE(hook));
331 else if (hook == priv->downlink)
332 priv->downlink = NULL;
333 else if (hook == priv->inet)
334 priv->inet = NULL;
335 else if (hook == priv->ppp)
336 priv->ppp = NULL;
337 else
338 panic(__func__);
339 return (0);
340 }
341
Cache object: 5376a1e002f62f77eec0af6f88d628f7
|