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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) 1996 Apple Computer, Inc.
	30	*
	31	* Created April 8, 1996 by Tuyen Nguyen
	32	* Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
	33	*
	34	* File: tickle.c
	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	#include <net/if.h>
	49
	50	#include <netat/sysglue.h>
	51	#include <netat/appletalk.h>
	52	#include <netat/at_var.h>
	53	#include <netat/routing_tables.h>
	54	#include <netat/at_pcb.h>
	55	#include <netat/aurp.h>
	56	#include <netat/debug.h>
	57
	58	/* */
	59	void AURPsndTickle(state)
	60	aurp_state_t *state;
	61	{
	62	int msize;
	63	gbuf_t *m;
	64	aurp_hdr_t *hdrp;
	65
	66	atalk_lock();
	67
	68	if (state->rcv_state == AURPSTATE_Unconnected) {
	69	atalk_unlock();
	70	return;
	71	}
	72	/* stop trying if the retry count exceeds the maximum retry value */
	73	if (++state->tickle_retry > AURP_MaxTickleRetry) {
	74	dPrintf(D_M_AURP, D_L_WARNING,
	75	("AURPsndTickle: no response, %d\n", state->rem_node));
	76	/*
	77	* the tunnel peer seems to have disappeared, update state info
	78	*/
	79	state->snd_state = AURPSTATE_Unconnected;
	80	state->rcv_state = AURPSTATE_Unconnected;
	81	state->tickle_retry = 0;
	82	AURPcleanup(state);
	83
	84	/* purge all routes associated with the tunnel peer */
	85	AURPpurgeri(state->rem_node);
	86	atalk_unlock();
	87	return;
	88	}
	89
	90	if (state->tickle_retry > 1) {
	91	msize = sizeof(aurp_hdr_t);
	92	if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
	93	gbuf_wset(m,msize);
	94
	95	/* construct the tickle packet */
	96	hdrp = (aurp_hdr_t *)gbuf_rptr(m);
	97	hdrp->connection_id = state->rcv_connection_id;
	98	hdrp->sequence_number = 0;
	99	hdrp->command_code = AURPCMD_Tickle;
	100	hdrp->flags = 0;
	101
	102	/* send the packet */
	103	AURPsend(m, AUD_AURP, state->rem_node);
	104	}
	105	}
	106
	107	/* start the retry timer */
	108	timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
	109
	110	atalk_unlock();
	111	}
	112
	113	/* */
	114	void AURPrcvTickle(state, m)
	115	aurp_state_t *state;
	116	gbuf_t *m;
	117	{
	118	aurp_hdr_t hdrp = (aurp_hdr_t )gbuf_rptr(m);
	119
	120	/* make sure we're in a valid state to accept it */
	121	if (state->snd_state == AURPSTATE_Unconnected) {
	122	dPrintf(D_M_AURP, D_L_WARNING,
	123	("AURPrcvTickle: unexpected request\n"));
	124	gbuf_freem(m);
	125	return;
	126	}
	127
	128	/* construct the tickle ack packet */
	129	gbuf_wset(m,sizeof(aurp_hdr_t));
	130	hdrp->command_code = AURPCMD_TickleAck;
	131	hdrp->flags = 0;
	132
	133	/* send the packet */
	134	AURPsend(m, AUD_AURP, state->rem_node);
	135	}
	136
	137	/* */
	138	void AURPrcvTickleAck(state, m)
	139	aurp_state_t *state;
	140	gbuf_t *m;
	141	{
	142	aurp_hdr_t hdrp = (aurp_hdr_t )gbuf_rptr(m);
	143
	144	/* make sure we're in a valid state to accept it */
	145	if (state->rcv_state == AURPSTATE_Unconnected) {
	146	dPrintf(D_M_AURP, D_L_WARNING,
	147	("AURPrcvTickleAck: unexpected response\n"));
	148	gbuf_freem(m);
	149	return;
	150	}
	151
	152	/* check for the correct connection id */
	153	if (hdrp->connection_id != state->rcv_connection_id) {
	154	dPrintf(D_M_AURP, D_L_WARNING,
	155	("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n",
	156	hdrp->connection_id, state->rcv_connection_id));
	157	gbuf_freem(m);
	158	return;
	159	}
	160	gbuf_freem(m);
	161
	162	/* update state info */
	163	state->tickle_retry = 0;
	164	}