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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 * $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>
50 #include <netgraph/ng_message.h>
51 #include <netgraph/netgraph.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_rmnode
;
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
= {
92 NETGRAPH_INIT(UI
, &typestruct
);
94 /************************************************************************
96 ************************************************************************/
99 * Create a newborn node. We start with an implicit reference.
103 ng_UI_constructor(node_p
*nodep
)
108 /* Allocate private structure */
109 priv
= kmalloc(sizeof(*priv
), M_NETGRAPH
, M_NOWAIT
| M_ZERO
);
113 /* Call generic node constructor */
114 if ((error
= ng_make_node_common(&typestruct
, nodep
))) {
115 kfree(priv
, M_NETGRAPH
);
118 (*nodep
)->private = priv
;
125 * Give our ok for a hook to be added
128 ng_UI_newhook(node_p node
, hook_p hook
, const char *name
)
130 const priv_p priv
= node
->private;
132 if (!strcmp(name
, NG_UI_HOOK_DOWNSTREAM
)) {
135 priv
->downlink
= hook
;
136 } else if (!strcmp(name
, NG_UI_HOOK_UPSTREAM
)) {
146 * Receive a control message
149 ng_UI_rcvmsg(node_p node
, struct ng_mesg
*msg
,
150 const char *raddr
, struct ng_mesg
**rp
)
152 kfree(msg
, M_NETGRAPH
);
156 #define MAX_ENCAPS_HDR 1
157 #define ERROUT(x) do { error = (x); goto done; } while (0)
160 * Receive a data frame
163 ng_UI_rcvdata(hook_p hook
, struct mbuf
*m
, meta_p meta
)
165 const node_p node
= hook
->node
;
166 const priv_p priv
= node
->private;
169 if (hook
== priv
->downlink
) {
172 if (!m
|| (m
->m_len
< MAX_ENCAPS_HDR
173 && !(m
= m_pullup(m
, MAX_ENCAPS_HDR
))))
175 ptr
= start
= mtod(m
, u_char
*);
177 /* Must be UI frame */
178 if (*ptr
++ != HDLC_UI
)
181 m_adj(m
, ptr
- start
);
182 NG_SEND_DATA(error
, priv
->uplink
, m
, meta
); /* m -> NULL */
183 } else if (hook
== priv
->uplink
) {
184 M_PREPEND(m
, 1, M_NOWAIT
); /* Prepend IP NLPID */
187 mtod(m
, u_char
*)[0] = HDLC_UI
;
188 NG_SEND_DATA(error
, priv
->downlink
, m
, meta
); /* m -> NULL */
193 NG_FREE_DATA(m
, meta
); /* does nothing if m == NULL */
201 ng_UI_rmnode(node_p node
)
203 const priv_p priv
= node
->private;
205 /* Take down netgraph node */
206 node
->flags
|= NG_INVALID
;
209 bzero(priv
, sizeof(*priv
));
210 kfree(priv
, M_NETGRAPH
);
211 node
->private = NULL
;
220 ng_UI_disconnect(hook_p hook
)
222 const priv_p priv
= hook
->node
->private;
224 if (hook
->node
->numhooks
== 0)
225 ng_rmnode(hook
->node
);
226 else if (hook
== priv
->downlink
)
227 priv
->downlink
= NULL
;
228 else if (hook
== priv
->uplink
)