252 lines
6.3 KiB
C
252 lines
6.3 KiB
C
|
|
/*
|
|
* ng_UI.c
|
|
*
|
|
* Copyright (c) 1996-1999 Whistle Communications, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Subject to the following obligations and disclaimer of warranty, use and
|
|
* redistribution of this software, in source or object code forms, with or
|
|
* without modifications are expressly permitted by Whistle Communications;
|
|
* provided, however, that:
|
|
* 1. Any and all reproductions of the source or object code must include the
|
|
* copyright notice above and the following disclaimer of warranties; and
|
|
* 2. No rights are granted, in any manner or form, to use Whistle
|
|
* Communications, Inc. trademarks, including the mark "WHISTLE
|
|
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
|
|
* such appears in the above copyright notice or in the software.
|
|
*
|
|
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
|
|
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
|
|
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
|
|
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
|
|
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
|
|
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
|
|
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
|
|
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
|
|
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
|
|
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
|
|
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
|
|
* OF SUCH DAMAGE.
|
|
*
|
|
* Author: Julian Elischer <julian@freebsd.org>
|
|
*
|
|
* $FreeBSD$
|
|
* $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/errno.h>
|
|
|
|
|
|
#include <netgraph/ng_message.h>
|
|
#include <netgraph/netgraph.h>
|
|
#include <netgraph/ng_UI.h>
|
|
|
|
/*
|
|
* DEFINITIONS
|
|
*/
|
|
|
|
/* Everything, starting with sdlc on has defined UI as 0x03 */
|
|
#define HDLC_UI 0x03
|
|
|
|
/* Node private data */
|
|
struct ng_UI_private {
|
|
hook_p downlink;
|
|
hook_p uplink;
|
|
};
|
|
typedef struct ng_UI_private *priv_p;
|
|
|
|
/* Netgraph node methods */
|
|
static ng_constructor_t ng_UI_constructor;
|
|
static ng_rcvmsg_t ng_UI_rcvmsg;
|
|
static ng_shutdown_t ng_UI_shutdown;
|
|
static ng_newhook_t ng_UI_newhook;
|
|
static ng_rcvdata_t ng_UI_rcvdata;
|
|
static ng_disconnect_t ng_UI_disconnect;
|
|
|
|
/* Node type descriptor */
|
|
static struct ng_type typestruct = {
|
|
NG_ABI_VERSION,
|
|
NG_UI_NODE_TYPE,
|
|
NULL,
|
|
ng_UI_constructor,
|
|
ng_UI_rcvmsg,
|
|
ng_UI_shutdown,
|
|
ng_UI_newhook,
|
|
NULL,
|
|
NULL,
|
|
ng_UI_rcvdata,
|
|
ng_UI_disconnect,
|
|
NULL
|
|
};
|
|
NETGRAPH_INIT(UI, &typestruct);
|
|
|
|
/************************************************************************
|
|
NETGRAPH NODE STUFF
|
|
************************************************************************/
|
|
|
|
/*
|
|
* Create a newborn node. We start with an implicit reference.
|
|
*/
|
|
|
|
static int
|
|
ng_UI_constructor(node_p node)
|
|
{
|
|
priv_p priv;
|
|
|
|
/* Allocate private structure */
|
|
MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
|
|
if (priv == NULL) {
|
|
return (ENOMEM);
|
|
}
|
|
NG_NODE_SET_PRIVATE(node, priv);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Give our ok for a hook to be added
|
|
*/
|
|
static int
|
|
ng_UI_newhook(node_p node, hook_p hook, const char *name)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
|
|
if (priv->downlink)
|
|
return (EISCONN);
|
|
priv->downlink = hook;
|
|
} else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
|
|
if (priv->uplink)
|
|
return (EISCONN);
|
|
priv->uplink = hook;
|
|
} else
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Receive a control message
|
|
*/
|
|
static int
|
|
ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
|
|
{
|
|
int error;
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct ng_mesg *msg;
|
|
|
|
msg = NGI_MSG(item); /* only peeking */
|
|
if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook) {
|
|
if (lasthook == priv->downlink) {
|
|
if (priv->uplink) {
|
|
NG_FWD_ITEM_HOOK(error, item, priv->uplink);
|
|
return (error);
|
|
}
|
|
} else {
|
|
if (priv->downlink) {
|
|
NG_FWD_ITEM_HOOK(error, item, priv->downlink);
|
|
return (error);
|
|
}
|
|
}
|
|
}
|
|
|
|
NG_FREE_ITEM(item);
|
|
return (EINVAL);
|
|
}
|
|
|
|
#define MAX_ENCAPS_HDR 1
|
|
#define ERROUT(x) do { error = (x); goto done; } while (0)
|
|
|
|
/*
|
|
* Receive a data frame
|
|
*/
|
|
static int
|
|
ng_UI_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
const node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
struct mbuf *m;
|
|
int error = 0;
|
|
|
|
NGI_GET_M(item, m);
|
|
if (hook == priv->downlink) {
|
|
u_char *start, *ptr;
|
|
|
|
if (!m || (m->m_len < MAX_ENCAPS_HDR
|
|
&& !(m = m_pullup(m, MAX_ENCAPS_HDR))))
|
|
ERROUT(ENOBUFS);
|
|
ptr = start = mtod(m, u_char *);
|
|
|
|
/* Must be UI frame */
|
|
if (*ptr++ != HDLC_UI)
|
|
ERROUT(0);
|
|
|
|
m_adj(m, ptr - start);
|
|
NG_FWD_NEW_DATA(error, item, priv->uplink, m); /* m -> NULL */
|
|
} else if (hook == priv->uplink) {
|
|
M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */
|
|
if (!m)
|
|
ERROUT(ENOBUFS);
|
|
mtod(m, u_char *)[0] = HDLC_UI;
|
|
NG_FWD_NEW_DATA(error, item, priv->downlink, m); /* m -> NULL */
|
|
} else
|
|
panic(__func__);
|
|
|
|
done:
|
|
NG_FREE_M(m); /* does nothing if m == NULL */
|
|
if (item)
|
|
NG_FREE_ITEM(item);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Shutdown node
|
|
*/
|
|
static int
|
|
ng_UI_shutdown(node_p node)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
/* Take down netgraph node */
|
|
FREE(priv, M_NETGRAPH);
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(node);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection
|
|
*/
|
|
static int
|
|
ng_UI_disconnect(hook_p hook)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
|
|
if (hook == priv->downlink)
|
|
priv->downlink = NULL;
|
|
else if (hook == priv->uplink)
|
|
priv->uplink = NULL;
|
|
else
|
|
panic(__func__);
|
|
/*
|
|
* If we are not already shutting down,
|
|
* and we have no more hooks, then DO shut down.
|
|
*/
|
|
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
|
|
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
|
|
ng_rmnode_self(NG_HOOK_NODE(hook));
|
|
}
|
|
return (0);
|
|
}
|
|
|