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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 * $Whistle: ng_rfc1490.c,v 1.22 1999/11/01 09:24:52 julian Exp $
44 * This node does RFC 1490 multiplexing.
46 * NOTE: RFC 1490 is updated by RFC 2427.
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>
55 #include <sys/socket.h>
58 #include <netinet/in.h>
59 #include <netinet/if_ether.h>
61 #include <netgraph/ng_message.h>
62 #include <netgraph/netgraph.h>
63 #include "ng_rfc1490.h"
69 /* Q.922 stuff -- see RFC 1490 */
73 #define NLPID_PPP 0xCF
74 #define NLPID_SNAP 0x80
75 #define NLPID_Q933 0x08
76 #define NLPID_CLNP 0x81
77 #define NLPID_ESIS 0x82
78 #define NLPID_ISIS 0x83
80 /* Node private data */
81 struct ng_rfc1490_private {
86 typedef struct ng_rfc1490_private *priv_p;
88 /* Netgraph node methods */
89 static ng_constructor_t ng_rfc1490_constructor;
90 static ng_rcvmsg_t ng_rfc1490_rcvmsg;
91 static ng_shutdown_t ng_rfc1490_rmnode;
92 static ng_newhook_t ng_rfc1490_newhook;
93 static ng_rcvdata_t ng_rfc1490_rcvdata;
94 static ng_disconnect_t ng_rfc1490_disconnect;
96 /* Node type descriptor */
97 static struct ng_type typestruct = {
101 ng_rfc1490_constructor,
109 ng_rfc1490_disconnect,
112 NETGRAPH_INIT(rfc1490, &typestruct);
114 /************************************************************************
116 ************************************************************************/
122 ng_rfc1490_constructor(node_p *nodep)
127 /* Allocate private structure */
128 priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
132 /* Call generic node constructor */
133 if ((error = ng_make_node_common(&typestruct, nodep))) {
134 kfree(priv, M_NETGRAPH);
137 (*nodep)->private = priv;
144 * Give our ok for a hook to be added
147 ng_rfc1490_newhook(node_p node, hook_p hook, const char *name)
149 const priv_p priv = node->private;
151 if (!strcmp(name, NG_RFC1490_HOOK_DOWNSTREAM)) {
154 priv->downlink = hook;
155 } else if (!strcmp(name, NG_RFC1490_HOOK_PPP)) {
159 } else if (!strcmp(name, NG_RFC1490_HOOK_INET)) {
169 * Receive a control message. We don't support any special ones.
172 ng_rfc1490_rcvmsg(node_p node, struct ng_mesg *msg,
173 const char *raddr, struct ng_mesg **rp)
175 kfree(msg, M_NETGRAPH);
180 * Receive data on a hook and encapsulate according to RFC 1490.
181 * Only those nodes marked (*) are supported by this routine so far.
186 * --------------------------------------------
190 * --------------------------------- --------------
191 * | 0x08 | 0x81 |0xCC |0xCF | 0x00 |..01.... |..10....
193 * Q.933 CLNP IP(*) PPP(*) SNAP ISO 8208 ISO 8208
194 * | (rfc1973) | Modulo 8 Modulo 128
196 * -------------------- OUI
198 * L2 ID L3 ID -------------------------
199 * | User |00-80-C2 |00-00-00
201 * | 0x70 PID Ethertype
203 * ------------------- --------------... ----------
204 * |0x51 |0x4E | |0x4C |0x1 |0xB | |0x806 |
206 * 7776 Q.922 Others 802.2 802.3 802.6 Others ARP(*) Others
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))
216 ng_rfc1490_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
218 const node_p node = hook->node;
219 const priv_p priv = node->private;
222 if (hook == priv->downlink) {
226 if (!m || (m->m_len < MAX_ENCAPS_HDR
227 && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
229 ptr = start = mtod(m, const u_char *);
231 /* Must be UI frame */
232 if (*ptr++ != HDLC_UI)
235 /* Eat optional zero pad byte */
239 /* Multiplex on NLPID */
242 if (OUICMP(ptr, 0, 0, 0)) { /* It's an ethertype */
246 etype = ntohs(*((const u_int16_t *)ptr));
248 m_adj(m, ptr - start);
252 priv->inet, m, meta);
255 case ETHERTYPE_REVARP:
259 } else if (OUICMP(ptr, 0x00, 0x80, 0xc2)) /* 802.1 bridging */
261 else /* Other weird stuff... */
265 m_adj(m, ptr - start);
266 NG_SEND_DATA(error, priv->inet, m, meta);
269 m_adj(m, ptr - start);
270 NG_SEND_DATA(error, priv->ppp, m, meta);
277 default: /* Try PPP (see RFC 1973) */
278 ptr--; /* NLPID becomes PPP proto */
279 if ((*ptr & 0x01) == 0x01)
281 m_adj(m, ptr - start);
282 NG_SEND_DATA(error, priv->ppp, m, meta);
285 } else if (hook == priv->ppp) {
286 M_PREPEND(m, 2, M_NOWAIT); /* Prepend PPP NLPID */
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_NOWAIT); /* Prepend IP NLPID */
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);
303 NG_FREE_DATA(m, meta);
311 ng_rfc1490_rmnode(node_p node)
313 const priv_p priv = node->private;
315 /* Take down netgraph node */
316 node->flags |= NG_INVALID;
319 bzero(priv, sizeof(*priv));
320 node->private = NULL;
321 kfree(priv, M_NETGRAPH);
322 ng_unref(node); /* let the node escape */
330 ng_rfc1490_disconnect(hook_p hook)
332 const priv_p priv = hook->node->private;
334 if (hook->node->numhooks == 0)
335 ng_rmnode(hook->node);
336 else if (hook == priv->downlink)
337 priv->downlink = NULL;
338 else if (hook == priv->inet)
340 else if (hook == priv->ppp)