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37 * Author: Julian Elischer <julian@freebsd.org>
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>
54 #include <netgraph/ng_UI.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_shutdown;
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 = {
93 NETGRAPH_INIT(UI, &typestruct);
95 /************************************************************************
97 ************************************************************************/
100 * Create a newborn node. We start with an implicit reference.
104 ng_UI_constructor(node_p node)
108 /* Allocate private structure */
109 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
113 NG_NODE_SET_PRIVATE(node, priv);
118 * Give our ok for a hook to be added
121 ng_UI_newhook(node_p node, hook_p hook, const char *name)
123 const priv_p priv = NG_NODE_PRIVATE(node);
125 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
128 priv->downlink = hook;
129 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
139 * Receive a control message
142 ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
145 const priv_p priv = NG_NODE_PRIVATE(node);
148 msg = NGI_MSG(item); /* only peeking */
149 if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook) {
150 if (lasthook == priv->downlink) {
152 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
156 if (priv->downlink) {
157 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
167 #define MAX_ENCAPS_HDR 1
168 #define ERROUT(x) do { error = (x); goto done; } while (0)
171 * Receive a data frame
174 ng_UI_rcvdata(hook_p hook, item_p item)
176 const node_p node = NG_HOOK_NODE(hook);
177 const priv_p priv = NG_NODE_PRIVATE(node);
182 if (hook == priv->downlink) {
185 if (!m || (m->m_len < MAX_ENCAPS_HDR
186 && !(m = m_pullup(m, MAX_ENCAPS_HDR))))
188 ptr = start = mtod(m, u_char *);
190 /* Must be UI frame */
191 if (*ptr++ != HDLC_UI)
194 m_adj(m, ptr - start);
195 NG_FWD_NEW_DATA(error, item, priv->uplink, m); /* m -> NULL */
196 } else if (hook == priv->uplink) {
197 M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */
200 mtod(m, u_char *)[0] = HDLC_UI;
201 NG_FWD_NEW_DATA(error, item, priv->downlink, m); /* m -> NULL */
206 NG_FREE_M(m); /* does nothing if m == NULL */
216 ng_UI_shutdown(node_p node)
218 const priv_p priv = NG_NODE_PRIVATE(node);
220 /* Take down netgraph node */
221 FREE(priv, M_NETGRAPH);
222 NG_NODE_SET_PRIVATE(node, NULL);
231 ng_UI_disconnect(hook_p hook)
233 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
235 if (hook == priv->downlink)
236 priv->downlink = NULL;
237 else if (hook == priv->uplink)
242 * If we are not already shutting down,
243 * and we have no more hooks, then DO shut down.
245 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
246 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
247 ng_rmnode_self(NG_HOOK_NODE(hook));