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 37#ifdef AURP_SUPPORT 38 39#include <sys/errno.h> 40#include <sys/types.h> 41#include <sys/param.h> 42#include <machine/spl.h> 43#include <sys/systm.h> 44#include <sys/kernel.h> 45#include <sys/proc.h> 46#include <sys/filedesc.h> 47#include <sys/fcntl.h> 48#include <sys/mbuf.h> 49#include <sys/socket.h> 50#include <sys/socketvar.h> 51#include <net/if.h> 52 53#include <netat/sysglue.h> 54#include <netat/appletalk.h> 55#include <netat/at_pcb.h> 56#include <netat/at_var.h> 57#include <netat/routing_tables.h> 58#include <netat/aurp.h> 59#include <netat/debug.h> 60 61/* */ 62void AURPsndTickle(state) 63 aurp_state_t *state; 64{ 65 int msize; 66 gbuf_t *m; 67 aurp_hdr_t *hdrp; 68 69 atalk_lock(); 70 71 if (state->rcv_state == AURPSTATE_Unconnected) { 72 atalk_unlock(); 73 return; 74 } 75 /* stop trying if the retry count exceeds the maximum retry value */ 76 if (++state->tickle_retry > AURP_MaxTickleRetry) { 77 dPrintf(D_M_AURP, D_L_WARNING, 78 ("AURPsndTickle: no response, %d\n", state->rem_node)); 79 /* 80 * the tunnel peer seems to have disappeared, update state info 81 */ 82 state->snd_state = AURPSTATE_Unconnected; 83 state->rcv_state = AURPSTATE_Unconnected; 84 state->tickle_retry = 0; 85 AURPcleanup(state); 86 87 /* purge all routes associated with the tunnel peer */ 88 AURPpurgeri(state->rem_node); 89 atalk_unlock(); 90 return; 91 } 92 93 if (state->tickle_retry > 1) { 94 msize = sizeof(aurp_hdr_t); 95 if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) { 96 gbuf_wset(m,msize); 97 98 /* construct the tickle packet */ 99 hdrp = (aurp_hdr_t *)gbuf_rptr(m); 100 hdrp->connection_id = state->rcv_connection_id; 101 hdrp->sequence_number = 0; 102 hdrp->command_code = AURPCMD_Tickle; 103 hdrp->flags = 0; 104 105 /* send the packet */ 106 AURPsend(m, AUD_AURP, state->rem_node); 107 } 108 } 109 110 /* start the retry timer */ 111 timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ); 112 113 atalk_unlock(); 114} 115 116/* */ 117void AURPrcvTickle(state, m) 118 aurp_state_t *state; 119 gbuf_t *m; 120{ 121 aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m); 122 123 /* make sure we're in a valid state to accept it */ 124 if (state->snd_state == AURPSTATE_Unconnected) { 125 dPrintf(D_M_AURP, D_L_WARNING, 126 ("AURPrcvTickle: unexpected request\n")); 127 gbuf_freem(m); 128 return; 129 } 130 131 /* construct the tickle ack packet */ 132 gbuf_wset(m,sizeof(aurp_hdr_t)); 133 hdrp->command_code = AURPCMD_TickleAck; 134 hdrp->flags = 0; 135 136 /* send the packet */ 137 AURPsend(m, AUD_AURP, state->rem_node); 138} 139 140/* */ 141void AURPrcvTickleAck(state, m) 142 aurp_state_t *state; 143 gbuf_t *m; 144{ 145 aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m); 146 147 /* make sure we're in a valid state to accept it */ 148 if (state->rcv_state == AURPSTATE_Unconnected) { 149 dPrintf(D_M_AURP, D_L_WARNING, 150 ("AURPrcvTickleAck: unexpected response\n")); 151 gbuf_freem(m); 152 return; 153 } 154 155 /* check for the correct connection id */ 156 if (hdrp->connection_id != state->rcv_connection_id) { 157 dPrintf(D_M_AURP, D_L_WARNING, 158 ("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n", 159 hdrp->connection_id, state->rcv_connection_id)); 160 gbuf_freem(m); 161 return; 162 } 163 gbuf_freem(m); 164 165 /* update state info */ 166 state->tickle_retry = 0; 167} 168 169#endif /* AURP_SUPPORT */ 170