ng_UI.c revision 213794
152419Sjulian/* 252419Sjulian * ng_UI.c 3139823Simp */ 4139823Simp 5139823Simp/*- 652419Sjulian * Copyright (c) 1996-1999 Whistle Communications, Inc. 752419Sjulian * All rights reserved. 852419Sjulian * 952419Sjulian * Subject to the following obligations and disclaimer of warranty, use and 1052419Sjulian * redistribution of this software, in source or object code forms, with or 1152419Sjulian * without modifications are expressly permitted by Whistle Communications; 1252419Sjulian * provided, however, that: 1352419Sjulian * 1. Any and all reproductions of the source or object code must include the 1452419Sjulian * copyright notice above and the following disclaimer of warranties; and 1552419Sjulian * 2. No rights are granted, in any manner or form, to use Whistle 1652419Sjulian * Communications, Inc. trademarks, including the mark "WHISTLE 1752419Sjulian * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 1852419Sjulian * such appears in the above copyright notice or in the software. 1952419Sjulian * 2052419Sjulian * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 2152419Sjulian * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 2252419Sjulian * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 2352419Sjulian * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 2452419Sjulian * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 2552419Sjulian * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 2652419Sjulian * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 2752419Sjulian * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 2852419Sjulian * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 2952419Sjulian * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 3052419Sjulian * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 3152419Sjulian * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 3252419Sjulian * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 3352419Sjulian * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 3452419Sjulian * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 3552419Sjulian * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 3652419Sjulian * OF SUCH DAMAGE. 3752419Sjulian * 3867506Sjulian * Author: Julian Elischer <julian@freebsd.org> 3952419Sjulian * 4052419Sjulian * $FreeBSD: head/sys/netgraph/ng_UI.c 213794 2010-10-13 17:21:21Z rpaulo $ 4152752Sjulian * $Whistle: ng_UI.c,v 1.14 1999/11/01 09:24:51 julian Exp $ 4252419Sjulian */ 4352419Sjulian 4452419Sjulian#include <sys/param.h> 4552419Sjulian#include <sys/systm.h> 4652419Sjulian#include <sys/errno.h> 4752419Sjulian#include <sys/kernel.h> 4852419Sjulian#include <sys/malloc.h> 4952419Sjulian#include <sys/mbuf.h> 5052419Sjulian#include <sys/errno.h> 5152419Sjulian 5252419Sjulian 5352419Sjulian#include <netgraph/ng_message.h> 5452419Sjulian#include <netgraph/netgraph.h> 5552419Sjulian#include <netgraph/ng_UI.h> 5652419Sjulian 5752419Sjulian/* 5852419Sjulian * DEFINITIONS 5952419Sjulian */ 6052419Sjulian 6152419Sjulian/* Everything, starting with sdlc on has defined UI as 0x03 */ 6252419Sjulian#define HDLC_UI 0x03 6352419Sjulian 6452419Sjulian/* Node private data */ 6553393Sarchiestruct ng_UI_private { 6652419Sjulian hook_p downlink; 6752419Sjulian hook_p uplink; 6852419Sjulian}; 6953393Sarchietypedef struct ng_UI_private *priv_p; 7052419Sjulian 7152419Sjulian/* Netgraph node methods */ 7252752Sjulianstatic ng_constructor_t ng_UI_constructor; 7352752Sjulianstatic ng_rcvmsg_t ng_UI_rcvmsg; 7470700Sjulianstatic ng_shutdown_t ng_UI_shutdown; 7552752Sjulianstatic ng_newhook_t ng_UI_newhook; 7652752Sjulianstatic ng_rcvdata_t ng_UI_rcvdata; 7752752Sjulianstatic ng_disconnect_t ng_UI_disconnect; 7852419Sjulian 7952419Sjulian/* Node type descriptor */ 8052419Sjulianstatic struct ng_type typestruct = { 81129823Sjulian .version = NG_ABI_VERSION, 82129823Sjulian .name = NG_UI_NODE_TYPE, 83129823Sjulian .constructor = ng_UI_constructor, 84129823Sjulian .rcvmsg = ng_UI_rcvmsg, 85129823Sjulian .shutdown = ng_UI_shutdown, 86129823Sjulian .newhook = ng_UI_newhook, 87129823Sjulian .rcvdata = ng_UI_rcvdata, 88129823Sjulian .disconnect = ng_UI_disconnect, 8952419Sjulian}; 9052419SjulianNETGRAPH_INIT(UI, &typestruct); 9152419Sjulian 9252419Sjulian/************************************************************************ 9352419Sjulian NETGRAPH NODE STUFF 9452419Sjulian ************************************************************************/ 9552419Sjulian 9652419Sjulian/* 9752419Sjulian * Create a newborn node. We start with an implicit reference. 9852419Sjulian */ 9952419Sjulian 10052419Sjulianstatic int 10170784Sjulianng_UI_constructor(node_p node) 10252419Sjulian{ 10352419Sjulian priv_p priv; 10452419Sjulian 10552419Sjulian /* Allocate private structure */ 106184205Sdes priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO); 10770700Sjulian if (priv == NULL) { 10852419Sjulian return (ENOMEM); 10952419Sjulian } 11070784Sjulian NG_NODE_SET_PRIVATE(node, priv); 11152419Sjulian return (0); 11252419Sjulian} 11352419Sjulian 11452419Sjulian/* 11552419Sjulian * Give our ok for a hook to be added 11652419Sjulian */ 11752419Sjulianstatic int 11852419Sjulianng_UI_newhook(node_p node, hook_p hook, const char *name) 11952419Sjulian{ 12070784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 12152419Sjulian 12252419Sjulian if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) { 12352419Sjulian if (priv->downlink) 12452419Sjulian return (EISCONN); 12552419Sjulian priv->downlink = hook; 12652419Sjulian } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) { 12752419Sjulian if (priv->uplink) 12852419Sjulian return (EISCONN); 12952419Sjulian priv->uplink = hook; 13052419Sjulian } else 13152419Sjulian return (EINVAL); 13252419Sjulian return (0); 13352419Sjulian} 13452419Sjulian 13552419Sjulian/* 13652419Sjulian * Receive a control message 13752419Sjulian */ 13852419Sjulianstatic int 13970700Sjulianng_UI_rcvmsg(node_p node, item_p item, hook_p lasthook) 14052419Sjulian{ 14170700Sjulian int error; 14270784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 14370700Sjulian struct ng_mesg *msg; 14469922Sjulian 14570700Sjulian msg = NGI_MSG(item); /* only peeking */ 14669922Sjulian if ((msg->header.typecookie == NGM_FLOW_COOKIE) && lasthook) { 14769922Sjulian if (lasthook == priv->downlink) { 14869922Sjulian if (priv->uplink) { 14970784Sjulian NG_FWD_ITEM_HOOK(error, item, priv->uplink); 15070700Sjulian return (error); 15169922Sjulian } 15269922Sjulian } else { 15369922Sjulian if (priv->downlink) { 15470784Sjulian NG_FWD_ITEM_HOOK(error, item, priv->downlink); 15570700Sjulian return (error); 15669922Sjulian } 15769922Sjulian } 15869922Sjulian } 15969922Sjulian 16070784Sjulian NG_FREE_ITEM(item); 16152419Sjulian return (EINVAL); 16252419Sjulian} 16352419Sjulian 16452419Sjulian#define MAX_ENCAPS_HDR 1 16552419Sjulian#define ERROUT(x) do { error = (x); goto done; } while (0) 16652419Sjulian 16752419Sjulian/* 16852419Sjulian * Receive a data frame 16952419Sjulian */ 17052419Sjulianstatic int 17170700Sjulianng_UI_rcvdata(hook_p hook, item_p item) 17252419Sjulian{ 17370784Sjulian const node_p node = NG_HOOK_NODE(hook); 17470784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 17570700Sjulian struct mbuf *m; 17652419Sjulian int error = 0; 17752419Sjulian 17870700Sjulian NGI_GET_M(item, m); 17952419Sjulian if (hook == priv->downlink) { 18052419Sjulian u_char *start, *ptr; 18152419Sjulian 182131112Sjulian if (m->m_len < MAX_ENCAPS_HDR 183131112Sjulian && !(m = m_pullup(m, MAX_ENCAPS_HDR))) 18452419Sjulian ERROUT(ENOBUFS); 18552419Sjulian ptr = start = mtod(m, u_char *); 18652419Sjulian 18752419Sjulian /* Must be UI frame */ 18852419Sjulian if (*ptr++ != HDLC_UI) 18952419Sjulian ERROUT(0); 19052419Sjulian 19152419Sjulian m_adj(m, ptr - start); 19270700Sjulian NG_FWD_NEW_DATA(error, item, priv->uplink, m); /* m -> NULL */ 19352419Sjulian } else if (hook == priv->uplink) { 194111119Simp M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */ 19552419Sjulian if (!m) 19652419Sjulian ERROUT(ENOBUFS); 19752419Sjulian mtod(m, u_char *)[0] = HDLC_UI; 19870700Sjulian NG_FWD_NEW_DATA(error, item, priv->downlink, m); /* m -> NULL */ 19952419Sjulian } else 200213794Srpaulo panic("%s", __func__); 20152419Sjulian 20252419Sjuliandone: 20370700Sjulian NG_FREE_M(m); /* does nothing if m == NULL */ 20470700Sjulian if (item) 20570700Sjulian NG_FREE_ITEM(item); 20652419Sjulian return (error); 20752419Sjulian} 20852419Sjulian 20952419Sjulian/* 21052419Sjulian * Shutdown node 21152419Sjulian */ 21252419Sjulianstatic int 21370700Sjulianng_UI_shutdown(node_p node) 21452419Sjulian{ 21570784Sjulian const priv_p priv = NG_NODE_PRIVATE(node); 21652419Sjulian 21752419Sjulian /* Take down netgraph node */ 218184205Sdes free(priv, M_NETGRAPH); 21970784Sjulian NG_NODE_SET_PRIVATE(node, NULL); 22070784Sjulian NG_NODE_UNREF(node); 22152419Sjulian return (0); 22252419Sjulian} 22352419Sjulian 22452419Sjulian/* 22552419Sjulian * Hook disconnection 22652419Sjulian */ 22752419Sjulianstatic int 22852419Sjulianng_UI_disconnect(hook_p hook) 22952419Sjulian{ 23070784Sjulian const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 23152419Sjulian 23270700Sjulian if (hook == priv->downlink) 23352419Sjulian priv->downlink = NULL; 23452419Sjulian else if (hook == priv->uplink) 23552419Sjulian priv->uplink = NULL; 23652419Sjulian else 237213794Srpaulo panic("%s", __func__); 23870700Sjulian /* 23970700Sjulian * If we are not already shutting down, 24070700Sjulian * and we have no more hooks, then DO shut down. 24170700Sjulian */ 24270784Sjulian if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) 24370784Sjulian && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) { 24470784Sjulian ng_rmnode_self(NG_HOOK_NODE(hook)); 24570700Sjulian } 24652419Sjulian return (0); 24752419Sjulian} 24852419Sjulian 249