bsd/netat/ddp_aep.c

   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 }