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37 * Author: Julian Elischer <julian@freebsd.org>
39 * $FreeBSD: src/sys/netgraph/ng_UI.c,v 1.6.2.2 2000/10/24 18:36:44 julian Exp $
40 * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/errno.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
49 #include <sys/errno.h>
52 #include <netgraph/ng_message.h>
53 #include <netgraph/netgraph.h>
60 /* Everything, starting with sdlc on has defined UI as 0x03 */
63 /* Node private data */
64 struct ng_UI_private {
68 typedef struct ng_UI_private *priv_p;
70 /* Netgraph node methods */
71 static ng_constructor_t ng_UI_constructor;
72 static ng_rcvmsg_t ng_UI_rcvmsg;
73 static ng_shutdown_t ng_UI_rmnode;
74 static ng_newhook_t ng_UI_newhook;
75 static ng_rcvdata_t ng_UI_rcvdata;
76 static ng_disconnect_t ng_UI_disconnect;
78 /* Node type descriptor */
79 static struct ng_type typestruct = {
94 NETGRAPH_INIT(UI, &typestruct);
96 /************************************************************************
98 ************************************************************************/
101 * Create a newborn node. We start with an implicit reference.
105 ng_UI_constructor(node_p *nodep)
110 /* Allocate private structure */
111 priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
115 /* Call generic node constructor */
116 if ((error = ng_make_node_common(&typestruct, nodep))) {
117 kfree(priv, M_NETGRAPH);
120 (*nodep)->private = priv;
127 * Give our ok for a hook to be added
130 ng_UI_newhook(node_p node, hook_p hook, const char *name)
132 const priv_p priv = node->private;
134 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
137 priv->downlink = hook;
138 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
148 * Receive a control message
151 ng_UI_rcvmsg(node_p node, struct ng_mesg *msg,
152 const char *raddr, struct ng_mesg **rp)
154 kfree(msg, M_NETGRAPH);
158 #define MAX_ENCAPS_HDR 1
159 #define ERROUT(x) do { error = (x); goto done; } while (0)
162 * Receive a data frame
165 ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
167 const node_p node = hook->node;
168 const priv_p priv = node->private;
171 if (hook == priv->downlink) {
174 if (!m || (m->m_len < MAX_ENCAPS_HDR
175 && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
177 ptr = start = mtod(m, u_char *);
179 /* Must be UI frame */
180 if (*ptr++ != HDLC_UI)
183 m_adj(m, ptr - start);
184 NG_SEND_DATA(error, priv->uplink, m, meta); /* m -> NULL */
185 } else if (hook == priv->uplink) {
186 M_PREPEND(m, 1, MB_DONTWAIT); /* Prepend IP NLPID */
189 mtod(m, u_char *)[0] = HDLC_UI;
190 NG_SEND_DATA(error, priv->downlink, m, meta); /* m -> NULL */
195 NG_FREE_DATA(m, meta); /* does nothing if m == NULL */
203 ng_UI_rmnode(node_p node)
205 const priv_p priv = node->private;
207 /* Take down netgraph node */
208 node->flags |= NG_INVALID;
211 bzero(priv, sizeof(*priv));
212 kfree(priv, M_NETGRAPH);
213 node->private = NULL;
222 ng_UI_disconnect(hook_p hook)
224 const priv_p priv = hook->node->private;
226 if (hook->node->numhooks == 0)
227 ng_rmnode(hook->node);
228 else if (hook == priv->downlink)
229 priv->downlink = NULL;
230 else if (hook == priv->uplink)