bsd/netat/ddp_aep.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  *      Copyright (c) 1997-1998 Apple Computer, Inc.
  25  *      All Rights Reserved.
  26  */
  27
  28 /*
  29  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  30  */
  31 #include <sys/errno.h>
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34 #include <machine/spl.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/proc.h>
  38 #include <sys/filedesc.h>
  39 #include <sys/fcntl.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/socket.h>
  42 #include <sys/socketvar.h>
  43
  44 #include <net/if.h>
  45
  46 #include <netat/sysglue.h>
  47 #include <netat/appletalk.h>
  48 #include <netat/ep.h>
  49 #include <netat/ddp.h>
  50 #include <netat/debug.h>
  51 #include <netat/at_snmp.h>
  52 #include <netat/at_pcb.h>
  53 #include <netat/at_var.h>
  54
  55 extern snmpStats_t snmpStats;
  56
  57 /****************************************************************/
  58 /*                                                              */
  59 /*                                                              */
  60 /*                      Echo Protocol                           */
  61 /*                                                              */
  62 /*                                                              */
  63 /****************************************************************/
  64
  65 void ep_input (mp, ifID)
  66      gbuf_t     *mp;
  67      register at_ifaddr_t *ifID;
  68 {
  69         register at_ddp_t       *ddp;
  70
  71         snmpStats.ec_echoReq++;
  72         ddp = (at_ddp_t *)gbuf_rptr(mp);
  73
  74         /* ep packets that have a source broadcast can cause
  75          * possible broadcast storms, prevent that here
  76          */
  77         if ( NET_VALUE(ddp->src_net) == 0 || ddp->src_node == 255) {
  78                 gbuf_freem(mp);
  79                 return;
  80         }
  81
  82         /*
  83          * Check if this AEP message is for us or need to be forwarded
  84          */
  85         if (!ROUTING_MODE ||
  86             (ifID->ifThisNode.s_net == NET_VALUE(ddp->dst_net))
  87             && (ifID->ifThisNode.s_node == ddp->dst_node)) {
  88
  89                 dPrintf(D_M_AEP, D_L_INFO, ("aep_input: received for this port from %d:%d\n",
  90                         NET_VALUE(ddp->src_net), ddp->src_node));
  91
  92                 if (ddp->type == DDP_ECHO &&
  93                     ddp->data[0] == EP_REQUEST) {
  94                         ddp->data[0] = EP_REPLY;
  95                         NET_NET(ddp->dst_net, ddp->src_net);
  96                         ddp->dst_node = ddp->src_node;
  97                         ddp->dst_socket = ddp->src_socket;
  98                         /* send the packet out.... */
  99                         snmpStats.ec_echoReply++;
 100                         (void)ddp_output(&mp, (at_socket)EP_SOCKET, FALSE);
 101                 } else
 102                         gbuf_freem(mp);
 103         }
 104         else {
 105                 dPrintf(D_M_AEP, D_L_INFO,
 106                          ("aep_input: calling routing needed  from %d:%d to %d:%d\n",
 107                         NET_VALUE(ddp->src_net), ddp->src_node, NET_VALUE(ddp->dst_net),
 108                         ddp->dst_node));
 109                 routing_needed(mp, ifID, TRUE);
 110         }
 111
 112         return;
 113 }