069154d55f
This version is functional and is aproaching solid.. notice I said APROACHING. There are many node types I cannot test I have tested: echo hole ppp socket vjc iface tee bpf async tty The rest compile and "Look" right. More changes to follow. DEBUGGING is enabled in this code to help if people have problems.
254 lines
6.2 KiB
C
254 lines
6.2 KiB
C
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/*
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* ng_UI.c
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*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Julian Elischer <julian@freebsd.org>
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*
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* $FreeBSD$
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* $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_UI.h>
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/*
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* DEFINITIONS
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*/
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/* Everything, starting with sdlc on has defined UI as 0x03 */
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#define HDLC_UI 0x03
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/* Node private data */
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struct ng_UI_private {
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hook_p downlink;
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hook_p uplink;
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};
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typedef struct ng_UI_private *priv_p;
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/* Netgraph node methods */
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static ng_constructor_t ng_UI_constructor;
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static ng_rcvmsg_t ng_UI_rcvmsg;
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static ng_shutdown_t ng_UI_shutdown;
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static ng_newhook_t ng_UI_newhook;
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static ng_rcvdata_t ng_UI_rcvdata;
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static ng_disconnect_t ng_UI_disconnect;
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/* Node type descriptor */
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static struct ng_type typestruct = {
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NG_ABI_VERSION,
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NG_UI_NODE_TYPE,
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NULL,
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ng_UI_constructor,
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ng_UI_rcvmsg,
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ng_UI_shutdown,
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ng_UI_newhook,
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NULL,
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NULL,
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ng_UI_rcvdata,
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ng_UI_disconnect,
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NULL
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};
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NETGRAPH_INIT(UI, &typestruct);
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/************************************************************************
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NETGRAPH NODE STUFF
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************************************************************************/
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/*
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* Create a newborn node. We start with an implicit reference.
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*/
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static int
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ng_UI_constructor(node_p nodep)
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{
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priv_p priv;
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/* Allocate private structure */
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MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (priv == NULL) {
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return (ENOMEM);
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}
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nodep->private = priv;
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return (0);
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}
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/*
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* Give our ok for a hook to be added
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*/
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static int
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ng_UI_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = node->private;
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if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) {
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if (priv->downlink)
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return (EISCONN);
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priv->downlink = hook;
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} else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) {
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if (priv->uplink)
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return (EISCONN);
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priv->uplink = hook;
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} else
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return (EINVAL);
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return (0);
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}
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/*
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* Receive a control message
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*/
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static int
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ng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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int error;
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const priv_p priv = node->private;
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struct ng_mesg *msg;
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msg = NGI_MSG(item); /* only peeking */
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if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook) {
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if (lasthook == priv->downlink) {
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if (priv->uplink) {
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NG_FWD_MSG_HOOK(error, node, item,
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priv->uplink, 0);
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return (error);
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}
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} else {
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if (priv->downlink) {
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NG_FWD_MSG_HOOK(error, node, item,
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priv->downlink, 0);
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return (error);
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}
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}
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}
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NG_FREE_MSG(msg);
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return (EINVAL);
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}
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#define MAX_ENCAPS_HDR 1
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#define ERROUT(x) do { error = (x); goto done; } while (0)
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/*
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* Receive a data frame
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*/
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static int
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ng_UI_rcvdata(hook_p hook, item_p item)
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{
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const node_p node = hook->node;
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const priv_p priv = node->private;
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struct mbuf *m;
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int error = 0;
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NGI_GET_M(item, m);
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if (hook == priv->downlink) {
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u_char *start, *ptr;
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if (!m || (m->m_len < MAX_ENCAPS_HDR
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&& !(m = m_pullup(m, MAX_ENCAPS_HDR))))
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ERROUT(ENOBUFS);
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ptr = start = mtod(m, u_char *);
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/* Must be UI frame */
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if (*ptr++ != HDLC_UI)
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ERROUT(0);
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m_adj(m, ptr - start);
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NG_FWD_NEW_DATA(error, item, priv->uplink, m); /* m -> NULL */
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} else if (hook == priv->uplink) {
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M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */
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if (!m)
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ERROUT(ENOBUFS);
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mtod(m, u_char *)[0] = HDLC_UI;
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NG_FWD_NEW_DATA(error, item, priv->downlink, m); /* m -> NULL */
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} else
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panic(__FUNCTION__);
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done:
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NG_FREE_M(m); /* does nothing if m == NULL */
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if (item)
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NG_FREE_ITEM(item);
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return (error);
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}
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/*
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* Shutdown node
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*/
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static int
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ng_UI_shutdown(node_p node)
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{
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const priv_p priv = node->private;
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/* Take down netgraph node */
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FREE(priv, M_NETGRAPH);
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node->private = NULL;
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ng_unref(node);
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return (0);
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}
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/*
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* Hook disconnection
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*/
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static int
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ng_UI_disconnect(hook_p hook)
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{
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const priv_p priv = hook->node->private;
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if (hook == priv->downlink)
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priv->downlink = NULL;
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else if (hook == priv->uplink)
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priv->uplink = NULL;
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else
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panic(__FUNCTION__);
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/*
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* If we are not already shutting down,
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* and we have no more hooks, then DO shut down.
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*/
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if ((hook->node->numhooks == 0)
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&& ((hook->node->flags & NG_INVALID) == 0)) {
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ng_rmnode_self(hook->node);
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}
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return (0);
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}
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