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Annotation of kernel/bsd/netat/ddp_aep.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /*
                     26:  *     Copyright (c) 1997-1998 Apple Computer, Inc.
                     27:  *     All Rights Reserved.
                     28:  *
                     29:  *     THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF APPLE COMPUTER, INC.
                     30:  *     The copyright notice above does not evidence any actual or
                     31:  *     intended publication of such source code.
                     32:  */
                     33: 
                     34: #include <sysglue.h> 
                     35: #include <at/appletalk.h>
                     36: #include <lap.h>
                     37: #include <at/ep.h>
                     38: #include <at/ddp.h>
                     39: #include <at_ddp.h>
                     40: #include <routing_tables.h>
                     41: #include <at_snmp.h>
                     42: 
                     43: extern snmpStats_t     snmpStats;
                     44: 
                     45: /****************************************************************/
                     46: /*                                                             */
                     47: /*                                                             */
                     48: /*                     Echo Protocol                           */
                     49: /*                                                             */
                     50: /*                                                             */
                     51: /****************************************************************/
                     52: 
                     53: static void    ep_input (mp, ifID)
                     54: gbuf_t *mp;
                     55: register at_if_t        *ifID;
                     56: {
                     57:        register at_ddp_t       *ddp;
                     58: 
                     59:        snmpStats.ec_echoReq++;
                     60:        ddp = (at_ddp_t *)gbuf_rptr(mp);
                     61: 
                     62:                /* ep packets that have a source broadcast can cause
                     63:          * possible broadcast storms, prevent that here
                     64:          */
                     65:        if ( NET_VALUE(ddp->src_net) == 0 || ddp->src_node == 255) {
                     66:                gbuf_freem(mp);
                     67:                return;
                     68:        }
                     69:        
                     70:        /*
                     71:         * Check if this AEP message is for us or need to be forwarded
                     72:         */
                     73:        if (!ROUTING_MODE || 
                     74:        (NET_VALUE(ifID->ifThisNode.atalk_net) == NET_VALUE(ddp->dst_net))
                     75:          && (ifID->ifThisNode.atalk_node == ddp->dst_node)) {
                     76: 
                     77:                dPrintf(D_M_AEP, D_L_INFO, ("aep_input: received for this port from %d:%d\n",
                     78:                        NET_VALUE(ddp->src_net), ddp->src_node));
                     79: 
                     80:                if (ddp->type == EP_DDP_TYPE && 
                     81:                    ddp->data[0] == EP_REQUEST) {
                     82:                        ddp->data[0] = EP_REPLY;
                     83:                        NET_NET(ddp->dst_net, ddp->src_net);
                     84:                        ddp->dst_node = ddp->src_node;
                     85:                        ddp->dst_socket = ddp->src_socket;
                     86:                        /* send the packet out.... */
                     87:                        snmpStats.ec_echoReply++;
                     88:                        if (ddp_output(&mp, (at_socket)EP_SOCKET, NULL) != 0)
                     89:                                gbuf_freem(mp);
                     90:                } else
                     91:                        gbuf_freem(mp);
                     92:        }
                     93:        else {
                     94:                dPrintf(D_M_AEP, D_L_INFO,
                     95:                         ("aep_input: calling routing needed  from %d:%d to %d:%d\n",
                     96:                        NET_VALUE(ddp->src_net), ddp->src_node, NET_VALUE(ddp->dst_net),
                     97:                        ddp->dst_node));
                     98:                routing_needed(mp, ifID, TRUE);
                     99:        }
                    100: 
                    101:        return;
                    102: }
                    103: 
                    104: int    ep_init()
                    105: {
                    106:        return ((int)ep_input);
                    107: }

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