bsd/netat/aurp_tickle.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  *      Copyright (c) 1996 Apple Computer, Inc.
  25  *
  26  *              Created April 8, 1996 by Tuyen Nguyen
  27  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  28  *
  29  *      File: tickle.c
  30  */
  31 #include <sys/errno.h>
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34 #include <machine/spl.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/proc.h>
  38 #include <sys/filedesc.h>
  39 #include <sys/fcntl.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/socket.h>
  42 #include <sys/socketvar.h>
  43 #include <net/if.h>
  44
  45 #include <netat/sysglue.h>
  46 #include <netat/appletalk.h>
  47 #include <netat/at_var.h>
  48 #include <netat/routing_tables.h>
  49 #include <netat/at_pcb.h>
  50 #include <netat/aurp.h>
  51 #include <netat/debug.h>
  52
  53 /* */
  54 void AURPsndTickle(state)
  55         aurp_state_t *state;
  56 {
  57         int msize;
  58         gbuf_t *m;
  59         aurp_hdr_t *hdrp;
  60
  61         atalk_lock();
  62
  63         if (state->rcv_state == AURPSTATE_Unconnected) {
  64                 atalk_unlock();
  65                 return;
  66         }
  67         /* stop trying if the retry count exceeds the maximum retry value */
  68         if (++state->tickle_retry > AURP_MaxTickleRetry) {
  69                 dPrintf(D_M_AURP, D_L_WARNING,
  70                         ("AURPsndTickle: no response, %d\n", state->rem_node));
  71                 /*
  72                  * the tunnel peer seems to have disappeared, update state info
  73                  */
  74                 state->snd_state = AURPSTATE_Unconnected;
  75                 state->rcv_state = AURPSTATE_Unconnected;
  76                 state->tickle_retry = 0;
  77                 AURPcleanup(state);
  78
  79                 /* purge all routes associated with the tunnel peer */
  80                 AURPpurgeri(state->rem_node);
  81                 atalk_unlock();
  82                 return;
  83         }
  84
  85   if (state->tickle_retry > 1) {
  86         msize = sizeof(aurp_hdr_t);
  87         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  88                 gbuf_wset(m,msize);
  89
  90                 /* construct the tickle packet */
  91                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  92                 hdrp->connection_id = state->rcv_connection_id;
  93                 hdrp->sequence_number = 0;
  94                 hdrp->command_code = AURPCMD_Tickle;
  95                 hdrp->flags = 0;
  96
  97                 /* send the packet */
  98                 AURPsend(m, AUD_AURP, state->rem_node);
  99         }
 100   }
 101
 102         /* start the retry timer */
 103         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 104
 105         atalk_unlock();
 106 }
 107
 108 /* */
 109 void AURPrcvTickle(state, m)
 110         aurp_state_t *state;
 111         gbuf_t *m;
 112 {
 113         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 114
 115         /* make sure we're in a valid state to accept it */
 116         if (state->snd_state == AURPSTATE_Unconnected) {
 117                 dPrintf(D_M_AURP, D_L_WARNING,
 118                         ("AURPrcvTickle: unexpected request\n"));
 119                 gbuf_freem(m);
 120                 return;
 121         }
 122
 123         /* construct the tickle ack packet */
 124         gbuf_wset(m,sizeof(aurp_hdr_t));
 125         hdrp->command_code = AURPCMD_TickleAck;
 126         hdrp->flags = 0;
 127
 128         /* send the packet */
 129         AURPsend(m, AUD_AURP, state->rem_node);
 130 }
 131
 132 /* */
 133 void AURPrcvTickleAck(state, m)
 134         aurp_state_t *state;
 135         gbuf_t *m;
 136 {
 137         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 138
 139         /* make sure we're in a valid state to accept it */
 140         if (state->rcv_state == AURPSTATE_Unconnected) {
 141                 dPrintf(D_M_AURP, D_L_WARNING,
 142                         ("AURPrcvTickleAck: unexpected response\n"));
 143                 gbuf_freem(m);
 144                 return;
 145         }
 146
 147         /* check for the correct connection id */
 148         if (hdrp->connection_id != state->rcv_connection_id) {
 149                 dPrintf(D_M_AURP, D_L_WARNING,
 150                         ("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n",
 151                         hdrp->connection_id, state->rcv_connection_id));
 152                 gbuf_freem(m);
 153                 return;
 154         }
 155         gbuf_freem(m);
 156
 157         /* update state info */
 158         state->tickle_retry = 0;
 159 }