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📄 NOTES(3.63 KB)
📁 atm
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📄 netgraph.h(41.17 KB)
📄 ng_UI.c(6.29 KB)
📄 ng_UI.h(2.36 KB)
📄 ng_async.c(16.51 KB)
📄 ng_async.h(4.05 KB)
📄 ng_atmllc.c(7.25 KB)
📄 ng_atmllc.h(1.85 KB)
📄 ng_base.c(100.62 KB)
📄 ng_bpf.c(14.66 KB)
📄 ng_bpf.h(3.97 KB)
📄 ng_bridge.c(29.37 KB)
📄 ng_bridge.h(7.58 KB)
📄 ng_car.c(19.62 KB)
📄 ng_car.h(4.6 KB)
📄 ng_checksum.c(15.85 KB)
📄 ng_checksum.h(2.63 KB)
📄 ng_cisco.c(15.47 KB)
📄 ng_cisco.h(3.39 KB)
📄 ng_deflate.c(17.09 KB)
📄 ng_deflate.h(2.85 KB)
📄 ng_device.c(10.65 KB)
📄 ng_device.h(1.74 KB)
📄 ng_echo.c(3.52 KB)
📄 ng_echo.h(2.28 KB)
📄 ng_eiface.c(16.31 KB)
📄 ng_eiface.h(2.09 KB)
📄 ng_etf.c(12.84 KB)
📄 ng_etf.h(3.05 KB)
📄 ng_ether.c(22.26 KB)
📄 ng_ether.h(3.22 KB)
📄 ng_ether_echo.c(4.17 KB)
📄 ng_ether_echo.h(2.32 KB)
📄 ng_frame_relay.c(13.21 KB)
📄 ng_frame_relay.h(2.51 KB)
📄 ng_gif.c(15.86 KB)
📄 ng_gif.h(4.04 KB)
📄 ng_gif_demux.c(10.83 KB)
📄 ng_gif_demux.h(2.05 KB)
📄 ng_hole.c(5.85 KB)
📄 ng_hole.h(2.69 KB)
📄 ng_hub.c(4.33 KB)
📄 ng_hub.h(1.68 KB)
📄 ng_iface.c(19.58 KB)
📄 ng_iface.h(2.68 KB)
📄 ng_ip_input.c(4.97 KB)
📄 ng_ip_input.h(3.78 KB)
📄 ng_ipfw.c(8.29 KB)
📄 ng_ipfw.h(1.54 KB)
📄 ng_ksocket.c(33.9 KB)
📄 ng_ksocket.h(3.86 KB)
📄 ng_l2tp.c(40.16 KB)
📄 ng_l2tp.h(8.12 KB)
📄 ng_lmi.c(28.15 KB)
📄 ng_lmi.h(3.2 KB)
📄 ng_macfilter.c(24.45 KB)
📄 ng_macfilter.h(5.7 KB)
📄 ng_message.h(14.69 KB)
📄 ng_mppc.c(23.88 KB)
📄 ng_mppc.h(3.29 KB)
📄 ng_nat.c(23.43 KB)
📄 ng_nat.h(6.87 KB)
📄 ng_one2many.c(15.88 KB)
📄 ng_one2many.h(4.56 KB)
📄 ng_parse.c(43.85 KB)
📄 ng_parse.h(18.49 KB)
📄 ng_patch.c(15.54 KB)
📄 ng_patch.h(3.64 KB)
📄 ng_pipe.c(26.97 KB)
📄 ng_pipe.h(5.56 KB)
📄 ng_ppp.c(72.27 KB)
📄 ng_ppp.h(9.77 KB)
📄 ng_pppoe.c(58.34 KB)
📄 ng_pppoe.h(9.64 KB)
📄 ng_pptpgre.c(36.05 KB)
📄 ng_pptpgre.h(6.04 KB)
📄 ng_pred1.c(18.02 KB)
📄 ng_pred1.h(2.73 KB)
📄 ng_rfc1490.c(13.33 KB)
📄 ng_rfc1490.h(2.62 KB)
📄 ng_sample.c(15.14 KB)
📄 ng_sample.h(3.53 KB)
📄 ng_socket.c(29.91 KB)
📄 ng_socket.h(2.73 KB)
📄 ng_socketvar.h(2.51 KB)
📄 ng_source.c(21.72 KB)
📄 ng_source.h(4.96 KB)
📄 ng_split.c(4.54 KB)
📄 ng_split.h(1.84 KB)
📄 ng_sppp.c(9.39 KB)
📄 ng_sppp.h(1.03 KB)
📄 ng_tag.c(19.05 KB)
📄 ng_tag.h(4.55 KB)
📄 ng_tcpmss.c(10.63 KB)
📄 ng_tcpmss.h(2.73 KB)
📄 ng_tee.c(10.61 KB)
📄 ng_tee.h(3.51 KB)
📄 ng_tty.c(11.96 KB)
📄 ng_tty.h(2.49 KB)
📄 ng_vjc.c(15.66 KB)
📄 ng_vjc.h(3.5 KB)
📄 ng_vlan.c(17.61 KB)
📄 ng_vlan.h(3.47 KB)

Editing: ng_UI.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 = {
	.version =	NG_ABI_VERSION,
	.name =		NG_UI_NODE_TYPE,
	.constructor =	ng_UI_constructor,
	.rcvmsg =	ng_UI_rcvmsg,
	.shutdown =	ng_UI_shutdown,
	.newhook =	ng_UI_newhook,
	.rcvdata =	ng_UI_rcvdata,
	.disconnect =	ng_UI_disconnect,
};
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 */
	priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
	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_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_NOWAIT);	/* 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("%s", __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("%s", __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);
}

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Editing: ng_UI.c

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