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38 * Author: Julian Elischer <julian@freebsd.org>
39 * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/errno.h>
45 #include <sys/kernel.h>
46 #include <sys/malloc.h>
48 #include <sys/errno.h>
50 #include <netgraph/ng_message.h>
51 #include <netgraph/netgraph.h>
52 #include <netgraph/ng_UI.h>
58 /* Everything, starting with sdlc on has defined UI as 0x03 */
61 /* Node private data */
62 struct ng_UI_private {
66 typedef struct ng_UI_private *priv_p;
68 /* Netgraph node methods */
69 static ng_constructor_t ng_UI_constructor;
70 static ng_rcvmsg_t ng_UI_rcvmsg;
71 static ng_shutdown_t ng_UI_shutdown;
72 static ng_newhook_t ng_UI_newhook;
73 static ng_rcvdata_t ng_UI_rcvdata;
74 static ng_disconnect_t ng_UI_disconnect;
76 /* Node type descriptor */
77 static struct ng_type typestruct = {
78 .version = NG_ABI_VERSION,
79 .name = NG_UI_NODE_TYPE,
80 .constructor = ng_UI_constructor,
81 .rcvmsg = ng_UI_rcvmsg,
82 .shutdown = ng_UI_shutdown,
83 .newhook = ng_UI_newhook,
84 .rcvdata = ng_UI_rcvdata,
85 .disconnect = ng_UI_disconnect,
87 NETGRAPH_INIT(UI, &typestruct);
89 /************************************************************************
91 ************************************************************************/
94 * Create a newborn node. We start with an implicit reference.
98 ng_UI_constructor(node_p node)
102 /* Allocate private structure */
103 priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
104 NG_NODE_SET_PRIVATE(node, priv);
109 * Give our ok for a hook to be added
112 ng_UI_newhook(node_p node, hook_p hook, const char *name)
114 const priv_p priv = NG_NODE_PRIVATE(node);
116 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
119 priv->downlink = hook;
120 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
130 * Receive a control message
133 ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
136 const priv_p priv = NG_NODE_PRIVATE(node);
139 msg = NGI_MSG(item); /* only peeking */
140 if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook) {
141 if (lasthook == priv->downlink) {
143 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
147 if (priv->downlink) {
148 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
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, item_p item)
167 const node_p node = NG_HOOK_NODE(hook);
168 const priv_p priv = NG_NODE_PRIVATE(node);
173 if (hook == priv->downlink) {
176 if (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_FWD_NEW_DATA(error, item, priv->uplink, m); /* m -> NULL */
187 } else if (hook == priv->uplink) {
188 M_PREPEND(m, 1, M_NOWAIT); /* Prepend IP NLPID */
191 mtod(m, u_char *)[0] = HDLC_UI;
192 NG_FWD_NEW_DATA(error, item, priv->downlink, m); /* m -> NULL */
194 panic("%s", __func__);
197 NG_FREE_M(m); /* does nothing if m == NULL */
207 ng_UI_shutdown(node_p node)
209 const priv_p priv = NG_NODE_PRIVATE(node);
211 /* Take down netgraph node */
212 free(priv, M_NETGRAPH);
213 NG_NODE_SET_PRIVATE(node, NULL);
222 ng_UI_disconnect(hook_p hook)
224 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
226 if (hook == priv->downlink)
227 priv->downlink = NULL;
228 else if (hook == priv->uplink)
231 panic("%s", __func__);
233 * If we are not already shutting down,
234 * and we have no more hooks, then DO shut down.
236 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
237 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
238 ng_rmnode_self(NG_HOOK_NODE(hook));