bsd/netat/aurp_tickle.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) 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_var.h>
  56 #include <netat/routing_tables.h>
  57 #include <netat/at_pcb.h>
  58 #include <netat/aurp.h>
  59 #include <netat/debug.h>
  60
  61 /* */
  62 void 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 /* */
 117 void 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 /* */
 141 void 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 */