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
60extern snmpStats_t snmpStats;
61
62/****************************************************************/
63/*								*/
64/*								*/
65/*			Echo Protocol				*/
66/*								*/
67/*								*/
68/****************************************************************/
69
70void 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}
119