bsd/netat/aurp_tickle.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  *      Copyright (c) 1996 Apple Computer, Inc.
  24  *
  25  *              Created April 8, 1996 by Tuyen Nguyen
  26  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  27  *
  28  *      File: tickle.c
  29  */
  30
  31 #ifdef AURP_SUPPORT
  32
  33 #include <sys/errno.h>
  34 #include <sys/types.h>
  35 #include <sys/param.h>
  36 #include <machine/spl.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/proc.h>
  40 #include <sys/filedesc.h>
  41 #include <sys/fcntl.h>
  42 #include <sys/mbuf.h>
  43 #include <sys/socket.h>
  44 #include <sys/socketvar.h>
  45 #include <net/if.h>
  46
  47 #include <netat/sysglue.h>
  48 #include <netat/appletalk.h>
  49 #include <netat/at_var.h>
  50 #include <netat/routing_tables.h>
  51 #include <netat/at_pcb.h>
  52 #include <netat/aurp.h>
  53 #include <netat/debug.h>
  54
  55 /* */
  56 void AURPsndTickle(state)
  57         aurp_state_t *state;
  58 {
  59         int msize;
  60         gbuf_t *m;
  61         aurp_hdr_t *hdrp;
  62
  63         atalk_lock();
  64
  65         if (state->rcv_state == AURPSTATE_Unconnected) {
  66                 atalk_unlock();
  67                 return;
  68         }
  69         /* stop trying if the retry count exceeds the maximum retry value */
  70         if (++state->tickle_retry > AURP_MaxTickleRetry) {
  71                 dPrintf(D_M_AURP, D_L_WARNING,
  72                         ("AURPsndTickle: no response, %d\n", state->rem_node));
  73                 /*
  74                  * the tunnel peer seems to have disappeared, update state info
  75                  */
  76                 state->snd_state = AURPSTATE_Unconnected;
  77                 state->rcv_state = AURPSTATE_Unconnected;
  78                 state->tickle_retry = 0;
  79                 AURPcleanup(state);
  80
  81                 /* purge all routes associated with the tunnel peer */
  82                 AURPpurgeri(state->rem_node);
  83                 atalk_unlock();
  84                 return;
  85         }
  86
  87   if (state->tickle_retry > 1) {
  88         msize = sizeof(aurp_hdr_t);
  89         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  90                 gbuf_wset(m,msize);
  91
  92                 /* construct the tickle packet */
  93                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  94                 hdrp->connection_id = state->rcv_connection_id;
  95                 hdrp->sequence_number = 0;
  96                 hdrp->command_code = AURPCMD_Tickle;
  97                 hdrp->flags = 0;
  98
  99                 /* send the packet */
 100                 AURPsend(m, AUD_AURP, state->rem_node);
 101         }
 102   }
 103
 104         /* start the retry timer */
 105         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 106
 107         atalk_unlock();
 108 }
 109
 110 /* */
 111 void AURPrcvTickle(state, m)
 112         aurp_state_t *state;
 113         gbuf_t *m;
 114 {
 115         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 116
 117         /* make sure we're in a valid state to accept it */
 118         if (state->snd_state == AURPSTATE_Unconnected) {
 119                 dPrintf(D_M_AURP, D_L_WARNING,
 120                         ("AURPrcvTickle: unexpected request\n"));
 121                 gbuf_freem(m);
 122                 return;
 123         }
 124
 125         /* construct the tickle ack packet */
 126         gbuf_wset(m,sizeof(aurp_hdr_t));
 127         hdrp->command_code = AURPCMD_TickleAck;
 128         hdrp->flags = 0;
 129
 130         /* send the packet */
 131         AURPsend(m, AUD_AURP, state->rem_node);
 132 }
 133
 134 /* */
 135 void AURPrcvTickleAck(state, m)
 136         aurp_state_t *state;
 137         gbuf_t *m;
 138 {
 139         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 140
 141         /* make sure we're in a valid state to accept it */
 142         if (state->rcv_state == AURPSTATE_Unconnected) {
 143                 dPrintf(D_M_AURP, D_L_WARNING,
 144                         ("AURPrcvTickleAck: unexpected response\n"));
 145                 gbuf_freem(m);
 146                 return;
 147         }
 148
 149         /* check for the correct connection id */
 150         if (hdrp->connection_id != state->rcv_connection_id) {
 151                 dPrintf(D_M_AURP, D_L_WARNING,
 152                         ("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n",
 153                         hdrp->connection_id, state->rcv_connection_id));
 154                 gbuf_freem(m);
 155                 return;
 156         }
 157         gbuf_freem(m);
 158
 159         /* update state info */
 160         state->tickle_retry = 0;
 161 }
 162
 163 #endif  /* AURP_SUPPORT */