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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)