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Commit	Line	Data
	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	}