kernel/netgraph7: Replace usage of MALLOC/FREE with kmalloc/kfree here too.
[dragonfly.git] / sys / netgraph7 / ng_UI.c
CommitLineData
b06ebda0
MD
1/*
2 * ng_UI.c
3 */
4
5/*-
6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Julian Elischer <julian@freebsd.org>
39 *
40 * $FreeBSD: src/sys/netgraph/ng_UI.c,v 1.20 2005/01/07 01:45:39 imp Exp $
5a975a3d 41 * $DragonFly: src/sys/netgraph7/ng_UI.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
b06ebda0
MD
42 * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $
43 */
44
45#include <sys/param.h>
46#include <sys/systm.h>
47#include <sys/errno.h>
48#include <sys/kernel.h>
49#include <sys/malloc.h>
50#include <sys/mbuf.h>
51#include <sys/errno.h>
52
53
5a975a3d
MD
54#include "ng_message.h"
55#include "netgraph.h"
56#include "ng_UI.h"
b06ebda0
MD
57
58/*
59 * DEFINITIONS
60 */
61
62/* Everything, starting with sdlc on has defined UI as 0x03 */
63#define HDLC_UI 0x03
64
65/* Node private data */
66struct ng_UI_private {
67 hook_p downlink;
68 hook_p uplink;
69};
70typedef struct ng_UI_private *priv_p;
71
72/* Netgraph node methods */
73static ng_constructor_t ng_UI_constructor;
74static ng_rcvmsg_t ng_UI_rcvmsg;
75static ng_shutdown_t ng_UI_shutdown;
76static ng_newhook_t ng_UI_newhook;
77static ng_rcvdata_t ng_UI_rcvdata;
78static ng_disconnect_t ng_UI_disconnect;
79
80/* Node type descriptor */
81static struct ng_type typestruct = {
82 .version = NG_ABI_VERSION,
83 .name = NG_UI_NODE_TYPE,
84 .constructor = ng_UI_constructor,
85 .rcvmsg = ng_UI_rcvmsg,
86 .shutdown = ng_UI_shutdown,
87 .newhook = ng_UI_newhook,
88 .rcvdata = ng_UI_rcvdata,
89 .disconnect = ng_UI_disconnect,
90};
91NETGRAPH_INIT(UI, &typestruct);
92
93/************************************************************************
94 NETGRAPH NODE STUFF
95 ************************************************************************/
96
97/*
98 * Create a newborn node. We start with an implicit reference.
99 */
100
101static int
102ng_UI_constructor(node_p node)
103{
104 priv_p priv;
105
106 /* Allocate private structure */
fc025606
SW
107 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
108 M_WAITOK | M_NULLOK | M_ZERO);
b06ebda0
MD
109 if (priv == NULL) {
110 return (ENOMEM);
111 }
112 NG_NODE_SET_PRIVATE(node, priv);
113 return (0);
114}
115
116/*
117 * Give our ok for a hook to be added
118 */
119static int
120ng_UI_newhook(node_p node, hook_p hook, const char *name)
121{
122 const priv_p priv = NG_NODE_PRIVATE(node);
123
124 if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
125 if (priv->downlink)
126 return (EISCONN);
127 priv->downlink = hook;
128 } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
129 if (priv->uplink)
130 return (EISCONN);
131 priv->uplink = hook;
132 } else
133 return (EINVAL);
134 return (0);
135}
136
137/*
138 * Receive a control message
139 */
140static int
141ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
142{
143 int error;
144 const priv_p priv = NG_NODE_PRIVATE(node);
145 struct ng_mesg *msg;
146
147 msg = NGI_MSG(item); /* only peeking */
148 if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook) {
149 if (lasthook == priv->downlink) {
150 if (priv->uplink) {
151 NG_FWD_ITEM_HOOK(error, item, priv->uplink);
152 return (error);
153 }
154 } else {
155 if (priv->downlink) {
156 NG_FWD_ITEM_HOOK(error, item, priv->downlink);
157 return (error);
158 }
159 }
160 }
161
162 NG_FREE_ITEM(item);
163 return (EINVAL);
164}
165
166#define MAX_ENCAPS_HDR 1
167#define ERROUT(x) do { error = (x); goto done; } while (0)
168
169/*
170 * Receive a data frame
171 */
172static int
173ng_UI_rcvdata(hook_p hook, item_p item)
174{
175 const node_p node = NG_HOOK_NODE(hook);
176 const priv_p priv = NG_NODE_PRIVATE(node);
177 struct mbuf *m;
178 int error = 0;
179
180 NGI_GET_M(item, m);
181 if (hook == priv->downlink) {
182 u_char *start, *ptr;
183
184 if (m->m_len < MAX_ENCAPS_HDR
185 && !(m = m_pullup(m, MAX_ENCAPS_HDR)))
186 ERROUT(ENOBUFS);
187 ptr = start = mtod(m, u_char *);
188
189 /* Must be UI frame */
190 if (*ptr++ != HDLC_UI)
191 ERROUT(0);
192
193 m_adj(m, ptr - start);
194 NG_FWD_NEW_DATA(error, item, priv->uplink, m); /* m -> NULL */
195 } else if (hook == priv->uplink) {
5a975a3d 196 M_PREPEND(m, 1, MB_DONTWAIT); /* Prepend IP NLPID */
b06ebda0
MD
197 if (!m)
198 ERROUT(ENOBUFS);
199 mtod(m, u_char *)[0] = HDLC_UI;
200 NG_FWD_NEW_DATA(error, item, priv->downlink, m); /* m -> NULL */
201 } else
202 panic(__func__);
203
204done:
205 NG_FREE_M(m); /* does nothing if m == NULL */
206 if (item)
207 NG_FREE_ITEM(item);
208 return (error);
209}
210
211/*
212 * Shutdown node
213 */
214static int
215ng_UI_shutdown(node_p node)
216{
217 const priv_p priv = NG_NODE_PRIVATE(node);
218
219 /* Take down netgraph node */
fc025606 220 kfree(priv, M_NETGRAPH);
b06ebda0
MD
221 NG_NODE_SET_PRIVATE(node, NULL);
222 NG_NODE_UNREF(node);
223 return (0);
224}
225
226/*
227 * Hook disconnection
228 */
229static int
230ng_UI_disconnect(hook_p hook)
231{
232 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
233
234 if (hook == priv->downlink)
235 priv->downlink = NULL;
236 else if (hook == priv->uplink)
237 priv->uplink = NULL;
238 else
239 panic(__func__);
240 /*
241 * If we are not already shutting down,
242 * and we have no more hooks, then DO shut down.
243 */
244 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
245 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
246 ng_rmnode_self(NG_HOOK_NODE(hook));
247 }
248 return (0);
249}
250