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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 * $DragonFly: src/sys/netgraph/UI/ng_UI.c,v 1.4 2004/06/02 14:42:59 eirikn Exp $
41 * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/errno.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
50 #include <sys/errno.h>
53 #include <netgraph/ng_message.h>
54 #include <netgraph/netgraph.h>
61 /* Everything, starting with sdlc on has defined UI as 0x03 */
64 /* Node private data */
65 struct ng_UI_private {
69 typedef struct ng_UI_private *priv_p;
71 /* Netgraph node methods */
72 static ng_constructor_t ng_UI_constructor;
73 static ng_rcvmsg_t ng_UI_rcvmsg;
74 static ng_shutdown_t ng_UI_rmnode;
75 static ng_newhook_t ng_UI_newhook;
76 static ng_rcvdata_t ng_UI_rcvdata;
77 static ng_disconnect_t ng_UI_disconnect;
79 /* Node type descriptor */
80 static struct ng_type typestruct = {
95 NETGRAPH_INIT(UI, &typestruct);
97 /************************************************************************
99 ************************************************************************/
102 * Create a newborn node. We start with an implicit reference.
106 ng_UI_constructor(node_p *nodep)
111 /* Allocate private structure */
112 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
115 bzero(priv, sizeof(*priv));
117 /* Call generic node constructor */
118 if ((error = ng_make_node_common(&typestruct, nodep))) {
119 FREE(priv, M_NETGRAPH);
122 (*nodep)->private = priv;
129 * Give our ok for a hook to be added
132 ng_UI_newhook(node_p node, hook_p hook, const char *name)
134 const priv_p priv = node->private;
136 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
139 priv->downlink = hook;
140 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
150 * Receive a control message
153 ng_UI_rcvmsg(node_p node, struct ng_mesg *msg,
154 const char *raddr, struct ng_mesg **rp)
156 FREE(msg, M_NETGRAPH);
160 #define MAX_ENCAPS_HDR 1
161 #define ERROUT(x) do { error = (x); goto done; } while (0)
164 * Receive a data frame
167 ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
169 const node_p node = hook->node;
170 const priv_p priv = node->private;
173 if (hook == priv->downlink) {
176 if (!m || (m->m_len < MAX_ENCAPS_HDR
177 && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
179 ptr = start = mtod(m, u_char *);
181 /* Must be UI frame */
182 if (*ptr++ != HDLC_UI)
185 m_adj(m, ptr - start);
186 NG_SEND_DATA(error, priv->uplink, m, meta); /* m -> NULL */
187 } else if (hook == priv->uplink) {
188 M_PREPEND(m, 1, MB_DONTWAIT); /* Prepend IP NLPID */
191 mtod(m, u_char *)[0] = HDLC_UI;
192 NG_SEND_DATA(error, priv->downlink, m, meta); /* m -> NULL */
197 NG_FREE_DATA(m, meta); /* does nothing if m == NULL */
205 ng_UI_rmnode(node_p node)
207 const priv_p priv = node->private;
209 /* Take down netgraph node */
210 node->flags |= NG_INVALID;
213 bzero(priv, sizeof(*priv));
214 FREE(priv, M_NETGRAPH);
215 node->private = NULL;
224 ng_UI_disconnect(hook_p hook)
226 const priv_p priv = hook->node->private;
228 if (hook->node->numhooks == 0)
229 ng_rmnode(hook->node);
230 else if (hook == priv->downlink)
231 priv->downlink = NULL;
232 else if (hook == priv->uplink)