bsd/netat/ddp_aep.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  *      Copyright (c) 1997-1998 Apple Computer, Inc.
  30  *      All Rights Reserved.
  31  */
  32
  33 /*
  34  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  35  */
  36 #include <sys/errno.h>
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include <machine/spl.h>
  40 #include <sys/systm.h>
  41 #include <sys/kernel.h>
  42 #include <sys/proc.h>
  43 #include <sys/filedesc.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/socket.h>
  47 #include <sys/socketvar.h>
  48
  49 #include <net/if.h>
  50
  51 #include <netat/sysglue.h>
  52 #include <netat/appletalk.h>
  53 #include <netat/ep.h>
  54 #include <netat/ddp.h>
  55 #include <netat/debug.h>
  56 #include <netat/at_snmp.h>
  57 #include <netat/at_pcb.h>
  58 #include <netat/at_var.h>
  59
  60 extern snmpStats_t snmpStats;
  61
  62 /****************************************************************/
  63 /*                                                              */
  64 /*                                                              */
  65 /*                      Echo Protocol                           */
  66 /*                                                              */
  67 /*                                                              */
  68 /****************************************************************/
  69
  70 void ep_input (mp, ifID)
  71      gbuf_t     *mp;
  72      register at_ifaddr_t *ifID;
  73 {
  74         register at_ddp_t       *ddp;
  75
  76         snmpStats.ec_echoReq++;
  77         ddp = (at_ddp_t *)gbuf_rptr(mp);
  78
  79         /* ep packets that have a source broadcast can cause
  80          * possible broadcast storms, prevent that here
  81          */
  82         if ( NET_VALUE(ddp->src_net) == 0 || ddp->src_node == 255) {
  83                 gbuf_freem(mp);
  84                 return;
  85         }
  86
  87         /*
  88          * Check if this AEP message is for us or need to be forwarded
  89          */
  90         if (!ROUTING_MODE ||
  91             ((ifID->ifThisNode.s_net == NET_VALUE(ddp->dst_net))
  92             && (ifID->ifThisNode.s_node == ddp->dst_node))) {
  93
  94                 dPrintf(D_M_AEP, D_L_INFO, ("aep_input: received for this port from %d:%d\n",
  95                         NET_VALUE(ddp->src_net), ddp->src_node));
  96
  97                 if (ddp->type == DDP_ECHO &&
  98                     ddp->data[0] == EP_REQUEST) {
  99                         ddp->data[0] = EP_REPLY;
 100                         NET_NET(ddp->dst_net, ddp->src_net);
 101                         ddp->dst_node = ddp->src_node;
 102                         ddp->dst_socket = ddp->src_socket;
 103                         /* send the packet out.... */
 104                         snmpStats.ec_echoReply++;
 105                         (void)ddp_output(&mp, (at_socket)EP_SOCKET, FALSE);
 106                 } else
 107                         gbuf_freem(mp);
 108         }
 109         else {
 110                 dPrintf(D_M_AEP, D_L_INFO,
 111                          ("aep_input: calling routing needed  from %d:%d to %d:%d\n",
 112                         NET_VALUE(ddp->src_net), ddp->src_node, NET_VALUE(ddp->dst_net),
 113                         ddp->dst_node));
 114                 routing_needed(mp, ifID, TRUE);
 115         }
 116
 117         return;
 118 }