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Annotation of kernel/bsd/netat/ddp_aep.c, revision 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        !            29:  *     THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF APPLE COMPUTER, INC.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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