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37 * Author: Julian Elischer <julian@freebsd.org>
39 * $FreeBSD: src/sys/netgraph/ng_rfc1490.c,v 1.6.2.4 2002/07/02 22:17:18 archie Exp $
40 * $DragonFly: src/sys/netgraph/rfc1490/ng_rfc1490.c,v 1.6 2008/01/05 14:02:40 swildner Exp $
41 * $Whistle: ng_rfc1490.c,v 1.22 1999/11/01 09:24:52 julian Exp $
45 * This node does RFC 1490 multiplexing.
47 * NOTE: RFC 1490 is updated by RFC 2427.
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/errno.h>
53 #include <sys/kernel.h>
54 #include <sys/malloc.h>
56 #include <sys/errno.h>
57 #include <sys/socket.h>
60 #include <netinet/in.h>
61 #include <netinet/if_ether.h>
63 #include <netgraph/ng_message.h>
64 #include <netgraph/netgraph.h>
65 #include "ng_rfc1490.h"
71 /* Q.922 stuff -- see RFC 1490 */
75 #define NLPID_PPP 0xCF
76 #define NLPID_SNAP 0x80
77 #define NLPID_Q933 0x08
78 #define NLPID_CLNP 0x81
79 #define NLPID_ESIS 0x82
80 #define NLPID_ISIS 0x83
82 /* Node private data */
83 struct ng_rfc1490_private
{
88 typedef struct ng_rfc1490_private
*priv_p
;
90 /* Netgraph node methods */
91 static ng_constructor_t ng_rfc1490_constructor
;
92 static ng_rcvmsg_t ng_rfc1490_rcvmsg
;
93 static ng_shutdown_t ng_rfc1490_rmnode
;
94 static ng_newhook_t ng_rfc1490_newhook
;
95 static ng_rcvdata_t ng_rfc1490_rcvdata
;
96 static ng_disconnect_t ng_rfc1490_disconnect
;
98 /* Node type descriptor */
99 static struct ng_type typestruct
= {
101 NG_RFC1490_NODE_TYPE
,
103 ng_rfc1490_constructor
,
111 ng_rfc1490_disconnect
,
114 NETGRAPH_INIT(rfc1490
, &typestruct
);
116 /************************************************************************
118 ************************************************************************/
124 ng_rfc1490_constructor(node_p
*nodep
)
129 /* Allocate private structure */
130 MALLOC(priv
, priv_p
, sizeof(*priv
), M_NETGRAPH
, M_NOWAIT
| M_ZERO
);
134 /* Call generic node constructor */
135 if ((error
= ng_make_node_common(&typestruct
, nodep
))) {
136 FREE(priv
, M_NETGRAPH
);
139 (*nodep
)->private = priv
;
146 * Give our ok for a hook to be added
149 ng_rfc1490_newhook(node_p node
, hook_p hook
, const char *name
)
151 const priv_p priv
= node
->private;
153 if (!strcmp(name
, NG_RFC1490_HOOK_DOWNSTREAM
)) {
156 priv
->downlink
= hook
;
157 } else if (!strcmp(name
, NG_RFC1490_HOOK_PPP
)) {
161 } else if (!strcmp(name
, NG_RFC1490_HOOK_INET
)) {
171 * Receive a control message. We don't support any special ones.
174 ng_rfc1490_rcvmsg(node_p node
, struct ng_mesg
*msg
,
175 const char *raddr
, struct ng_mesg
**rp
)
177 FREE(msg
, M_NETGRAPH
);
182 * Receive data on a hook and encapsulate according to RFC 1490.
183 * Only those nodes marked (*) are supported by this routine so far.
188 * --------------------------------------------
192 * --------------------------------- --------------
193 * | 0x08 | 0x81 |0xCC |0xCF | 0x00 |..01.... |..10....
195 * Q.933 CLNP IP(*) PPP(*) SNAP ISO 8208 ISO 8208
196 * | (rfc1973) | Modulo 8 Modulo 128
198 * -------------------- OUI
200 * L2 ID L3 ID -------------------------
201 * | User |00-80-C2 |00-00-00
203 * | 0x70 PID Ethertype
205 * ------------------- --------------... ----------
206 * |0x51 |0x4E | |0x4C |0x1 |0xB | |0x806 |
208 * 7776 Q.922 Others 802.2 802.3 802.6 Others ARP(*) Others
213 #define MAX_ENCAPS_HDR 8
214 #define ERROUT(x) do { error = (x); goto done; } while (0)
215 #define OUICMP(P,A,B,C) ((P)[0]==(A) && (P)[1]==(B) && (P)[2]==(C))
218 ng_rfc1490_rcvdata(hook_p hook
, struct mbuf
*m
, meta_p meta
)
220 const node_p node
= hook
->node
;
221 const priv_p priv
= node
->private;
224 if (hook
== priv
->downlink
) {
228 if (!m
|| (m
->m_len
< MAX_ENCAPS_HDR
229 && !(m
= m_pullup(m
, MAX_ENCAPS_HDR
))))
231 ptr
= start
= mtod(m
, const u_char
*);
233 /* Must be UI frame */
234 if (*ptr
++ != HDLC_UI
)
237 /* Eat optional zero pad byte */
241 /* Multiplex on NLPID */
244 if (OUICMP(ptr
, 0, 0, 0)) { /* It's an ethertype */
248 etype
= ntohs(*((const u_int16_t
*)ptr
));
250 m_adj(m
, ptr
- start
);
254 priv
->inet
, m
, meta
);
257 case ETHERTYPE_REVARP
:
261 } else if (OUICMP(ptr
, 0x00, 0x80, 0xc2)) /* 802.1 bridging */
263 else /* Other weird stuff... */
267 m_adj(m
, ptr
- start
);
268 NG_SEND_DATA(error
, priv
->inet
, m
, meta
);
271 m_adj(m
, ptr
- start
);
272 NG_SEND_DATA(error
, priv
->ppp
, m
, meta
);
279 default: /* Try PPP (see RFC 1973) */
280 ptr
--; /* NLPID becomes PPP proto */
281 if ((*ptr
& 0x01) == 0x01)
283 m_adj(m
, ptr
- start
);
284 NG_SEND_DATA(error
, priv
->ppp
, m
, meta
);
287 } else if (hook
== priv
->ppp
) {
288 M_PREPEND(m
, 2, MB_DONTWAIT
); /* Prepend PPP NLPID */
291 mtod(m
, u_char
*)[0] = HDLC_UI
;
292 mtod(m
, u_char
*)[1] = NLPID_PPP
;
293 NG_SEND_DATA(error
, priv
->downlink
, m
, meta
);
294 } else if (hook
== priv
->inet
) {
295 M_PREPEND(m
, 2, MB_DONTWAIT
); /* Prepend IP NLPID */
298 mtod(m
, u_char
*)[0] = HDLC_UI
;
299 mtod(m
, u_char
*)[1] = NLPID_IP
;
300 NG_SEND_DATA(error
, priv
->downlink
, m
, meta
);
305 NG_FREE_DATA(m
, meta
);
313 ng_rfc1490_rmnode(node_p node
)
315 const priv_p priv
= node
->private;
317 /* Take down netgraph node */
318 node
->flags
|= NG_INVALID
;
321 bzero(priv
, sizeof(*priv
));
322 node
->private = NULL
;
323 FREE(priv
, M_NETGRAPH
);
324 ng_unref(node
); /* let the node escape */
332 ng_rfc1490_disconnect(hook_p hook
)
334 const priv_p priv
= hook
->node
->private;
336 if (hook
->node
->numhooks
== 0)
337 ng_rmnode(hook
->node
);
338 else if (hook
== priv
->downlink
)
339 priv
->downlink
= NULL
;
340 else if (hook
== priv
->inet
)
342 else if (hook
== priv
->ppp
)