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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>
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 = {
80 .version = NG_ABI_VERSION,
81 .name = NG_UI_NODE_TYPE,
82 .constructor = ng_UI_constructor,
83 .rcvmsg = ng_UI_rcvmsg,
84 .shutdown = ng_UI_shutdown,
85 .newhook = ng_UI_newhook,
86 .rcvdata = ng_UI_rcvdata,
87 .disconnect = ng_UI_disconnect,
89 NETGRAPH_INIT(UI, &typestruct);
91 /************************************************************************
93 ************************************************************************/
96 * Create a newborn node. We start with an implicit reference.
100 ng_UI_constructor(node_p node)
104 /* Allocate private structure */
105 priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
106 NG_NODE_SET_PRIVATE(node, priv);
111 * Give our ok for a hook to be added
114 ng_UI_newhook(node_p node, hook_p hook, const char *name)
116 const priv_p priv = NG_NODE_PRIVATE(node);
118 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
121 priv->downlink = hook;
122 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
132 * Receive a control message
135 ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
138 const priv_p priv = NG_NODE_PRIVATE(node);
141 msg = NGI_MSG(item); /* only peeking */
142 if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook) {
143 if (lasthook == priv->downlink) {
145 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
149 if (priv->downlink) {
150 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
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, item_p item)
169 const node_p node = NG_HOOK_NODE(hook);
170 const priv_p priv = NG_NODE_PRIVATE(node);
175 if (hook == priv->downlink) {
178 if (m->m_len < MAX_ENCAPS_HDR
179 && !(m = m_pullup(m, MAX_ENCAPS_HDR)))
181 ptr = start = mtod(m, u_char *);
183 /* Must be UI frame */
184 if (*ptr++ != HDLC_UI)
187 m_adj(m, ptr - start);
188 NG_FWD_NEW_DATA(error, item, priv->uplink, m); /* m -> NULL */
189 } else if (hook == priv->uplink) {
190 M_PREPEND(m, 1, M_NOWAIT); /* Prepend IP NLPID */
193 mtod(m, u_char *)[0] = HDLC_UI;
194 NG_FWD_NEW_DATA(error, item, priv->downlink, m); /* m -> NULL */
196 panic("%s", __func__);
199 NG_FREE_M(m); /* does nothing if m == NULL */
209 ng_UI_shutdown(node_p node)
211 const priv_p priv = NG_NODE_PRIVATE(node);
213 /* Take down netgraph node */
214 free(priv, M_NETGRAPH);
215 NG_NODE_SET_PRIVATE(node, NULL);
224 ng_UI_disconnect(hook_p hook)
226 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
228 if (hook == priv->downlink)
229 priv->downlink = NULL;
230 else if (hook == priv->uplink)
233 panic("%s", __func__);
235 * If we are not already shutting down,
236 * and we have no more hooks, then DO shut down.
238 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
239 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
240 ng_rmnode_self(NG_HOOK_NODE(hook));