249 lines
6.3 KiB
C
249 lines
6.3 KiB
C
/*
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* ng_UI.c
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*/
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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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.version = NG_ABI_VERSION,
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.name = NG_UI_NODE_TYPE,
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.constructor = ng_UI_constructor,
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.rcvmsg = ng_UI_rcvmsg,
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.shutdown = ng_UI_shutdown,
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.newhook = ng_UI_newhook,
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.rcvdata = ng_UI_rcvdata,
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.disconnect = ng_UI_disconnect,
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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 node)
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{
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priv_p priv;
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/* Allocate private structure */
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priv = malloc(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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NG_NODE_SET_PRIVATE(node, 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 = NG_NODE_PRIVATE(node);
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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 = NG_NODE_PRIVATE(node);
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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_ITEM_HOOK(error, item, priv->uplink);
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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_ITEM_HOOK(error, item, priv->downlink);
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return (error);
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}
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}
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}
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NG_FREE_ITEM(item);
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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 = NG_HOOK_NODE(hook);
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const priv_p priv = NG_NODE_PRIVATE(node);
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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_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(__func__);
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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 = NG_NODE_PRIVATE(node);
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/* Take down netgraph node */
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free(priv, M_NETGRAPH);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_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 = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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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(__func__);
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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 ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
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&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
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ng_rmnode_self(NG_HOOK_NODE(hook));
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}
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return (0);
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}
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