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38 * Author: Julian Elischer <julian@freebsd.org>
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>
55 #include <netgraph/ng_UI.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_shutdown;
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 = {
81 .version = NG_ABI_VERSION,
82 .name = NG_UI_NODE_TYPE,
83 .constructor = ng_UI_constructor,
84 .rcvmsg = ng_UI_rcvmsg,
85 .shutdown = ng_UI_shutdown,
86 .newhook = ng_UI_newhook,
87 .rcvdata = ng_UI_rcvdata,
88 .disconnect = ng_UI_disconnect,
90 NETGRAPH_INIT(UI, &typestruct);
92 /************************************************************************
94 ************************************************************************/
97 * Create a newborn node. We start with an implicit reference.
101 ng_UI_constructor(node_p node)
105 /* Allocate private structure */
106 priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
107 NG_NODE_SET_PRIVATE(node, priv);
112 * Give our ok for a hook to be added
115 ng_UI_newhook(node_p node, hook_p hook, const char *name)
117 const priv_p priv = NG_NODE_PRIVATE(node);
119 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
122 priv->downlink = hook;
123 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
133 * Receive a control message
136 ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
139 const priv_p priv = NG_NODE_PRIVATE(node);
142 msg = NGI_MSG(item); /* only peeking */
143 if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook) {
144 if (lasthook == priv->downlink) {
146 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
150 if (priv->downlink) {
151 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
161 #define MAX_ENCAPS_HDR 1
162 #define ERROUT(x) do { error = (x); goto done; } while (0)
165 * Receive a data frame
168 ng_UI_rcvdata(hook_p hook, item_p item)
170 const node_p node = NG_HOOK_NODE(hook);
171 const priv_p priv = NG_NODE_PRIVATE(node);
176 if (hook == priv->downlink) {
179 if (m->m_len < MAX_ENCAPS_HDR
180 && !(m = m_pullup(m, MAX_ENCAPS_HDR)))
182 ptr = start = mtod(m, u_char *);
184 /* Must be UI frame */
185 if (*ptr++ != HDLC_UI)
188 m_adj(m, ptr - start);
189 NG_FWD_NEW_DATA(error, item, priv->uplink, m); /* m -> NULL */
190 } else if (hook == priv->uplink) {
191 M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */
194 mtod(m, u_char *)[0] = HDLC_UI;
195 NG_FWD_NEW_DATA(error, item, priv->downlink, m); /* m -> NULL */
197 panic("%s", __func__);
200 NG_FREE_M(m); /* does nothing if m == NULL */
210 ng_UI_shutdown(node_p node)
212 const priv_p priv = NG_NODE_PRIVATE(node);
214 /* Take down netgraph node */
215 free(priv, M_NETGRAPH);
216 NG_NODE_SET_PRIVATE(node, NULL);
225 ng_UI_disconnect(hook_p hook)
227 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
229 if (hook == priv->downlink)
230 priv->downlink = NULL;
231 else if (hook == priv->uplink)
234 panic("%s", __func__);
236 * If we are not already shutting down,
237 * and we have no more hooks, then DO shut down.
239 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
240 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
241 ng_rmnode_self(NG_HOOK_NODE(hook));