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Annotation of XNU/bsd/netat/ddp_aep.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  *     Copyright (c) 1997-1998 Apple Computer, Inc.
        !            24:  *     All Rights Reserved.
        !            25:  */
        !            26: 
        !            27: /*
        !            28:  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
        !            29:  */
        !            30: #include <sys/errno.h>
        !            31: #include <sys/types.h>
        !            32: #include <sys/param.h>
        !            33: #include <machine/spl.h>
        !            34: #include <sys/systm.h>
        !            35: #include <sys/kernel.h>
        !            36: #include <sys/proc.h>
        !            37: #include <sys/filedesc.h>
        !            38: #include <sys/fcntl.h>
        !            39: #include <sys/mbuf.h>
        !            40: #include <sys/socket.h>
        !            41: #include <sys/socketvar.h>
        !            42: 
        !            43: #include <net/if.h>
        !            44: 
        !            45: #include <netat/sysglue.h> 
        !            46: #include <netat/appletalk.h>
        !            47: #include <netat/ep.h>
        !            48: #include <netat/ddp.h>
        !            49: #include <netat/debug.h>
        !            50: #include <netat/at_snmp.h>
        !            51: #include <netat/at_pcb.h>
        !            52: #include <netat/at_var.h>
        !            53: 
        !            54: extern snmpStats_t snmpStats;
        !            55: 
        !            56: /****************************************************************/
        !            57: /*                                                             */
        !            58: /*                                                             */
        !            59: /*                     Echo Protocol                           */
        !            60: /*                                                             */
        !            61: /*                                                             */
        !            62: /****************************************************************/
        !            63: 
        !            64: void ep_input (mp, ifID)
        !            65:      gbuf_t    *mp;
        !            66:      register at_ifaddr_t *ifID;
        !            67: {
        !            68:        register at_ddp_t       *ddp;
        !            69: 
        !            70:        snmpStats.ec_echoReq++;
        !            71:        ddp = (at_ddp_t *)gbuf_rptr(mp);
        !            72: 
        !            73:        /* ep packets that have a source broadcast can cause
        !            74:          * possible broadcast storms, prevent that here
        !            75:          */
        !            76:        if ( NET_VALUE(ddp->src_net) == 0 || ddp->src_node == 255) {
        !            77:                gbuf_freem(mp);
        !            78:                return;
        !            79:        }
        !            80:        
        !            81:        /*
        !            82:         * Check if this AEP message is for us or need to be forwarded
        !            83:         */
        !            84:        if (!ROUTING_MODE || 
        !            85:            (ifID->ifThisNode.s_net == NET_VALUE(ddp->dst_net))
        !            86:            && (ifID->ifThisNode.s_node == ddp->dst_node)) {
        !            87: 
        !            88:                dPrintf(D_M_AEP, D_L_INFO, ("aep_input: received for this port from %d:%d\n",
        !            89:                        NET_VALUE(ddp->src_net), ddp->src_node));
        !            90: 
        !            91:                if (ddp->type == DDP_ECHO && 
        !            92:                    ddp->data[0] == EP_REQUEST) {
        !            93:                        ddp->data[0] = EP_REPLY;
        !            94:                        NET_NET(ddp->dst_net, ddp->src_net);
        !            95:                        ddp->dst_node = ddp->src_node;
        !            96:                        ddp->dst_socket = ddp->src_socket;
        !            97:                        /* send the packet out.... */
        !            98:                        snmpStats.ec_echoReply++;
        !            99:                        (void)ddp_output(&mp, (at_socket)EP_SOCKET, FALSE);
        !           100:                } else
        !           101:                        gbuf_freem(mp);
        !           102:        }
        !           103:        else {
        !           104:                dPrintf(D_M_AEP, D_L_INFO,
        !           105:                         ("aep_input: calling routing needed  from %d:%d to %d:%d\n",
        !           106:                        NET_VALUE(ddp->src_net), ddp->src_node, NET_VALUE(ddp->dst_net),
        !           107:                        ddp->dst_node));
        !           108:                routing_needed(mp, ifID, TRUE);
        !           109:        }
        !           110: 
        !           111:        return;
        !           112: }

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