bsd/netat/aurp_tickle.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  *      Copyright (c) 1996 Apple Computer, Inc.
  32  *
  33  *              Created April 8, 1996 by Tuyen Nguyen
  34  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  35  *
  36  *      File: tickle.c
  37  */
  38
  39 #ifdef AURP_SUPPORT
  40
  41 #include <sys/errno.h>
  42 #include <sys/types.h>
  43 #include <sys/param.h>
  44 #include <machine/spl.h>
  45 #include <sys/systm.h>
  46 #include <sys/kernel.h>
  47 #include <sys/proc.h>
  48 #include <sys/filedesc.h>
  49 #include <sys/fcntl.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/socket.h>
  52 #include <sys/socketvar.h>
  53 #include <net/if.h>
  54
  55 #include <netat/sysglue.h>
  56 #include <netat/appletalk.h>
  57 #include <netat/at_var.h>
  58 #include <netat/routing_tables.h>
  59 #include <netat/at_pcb.h>
  60 #include <netat/aurp.h>
  61 #include <netat/debug.h>
  62
  63 /* */
  64 void AURPsndTickle(state)
  65         aurp_state_t *state;
  66 {
  67         int msize;
  68         gbuf_t *m;
  69         aurp_hdr_t *hdrp;
  70
  71         atalk_lock();
  72
  73         if (state->rcv_state == AURPSTATE_Unconnected) {
  74                 atalk_unlock();
  75                 return;
  76         }
  77         /* stop trying if the retry count exceeds the maximum retry value */
  78         if (++state->tickle_retry > AURP_MaxTickleRetry) {
  79                 dPrintf(D_M_AURP, D_L_WARNING,
  80                         ("AURPsndTickle: no response, %d\n", state->rem_node));
  81                 /*
  82                  * the tunnel peer seems to have disappeared, update state info
  83                  */
  84                 state->snd_state = AURPSTATE_Unconnected;
  85                 state->rcv_state = AURPSTATE_Unconnected;
  86                 state->tickle_retry = 0;
  87                 AURPcleanup(state);
  88
  89                 /* purge all routes associated with the tunnel peer */
  90                 AURPpurgeri(state->rem_node);
  91                 atalk_unlock();
  92                 return;
  93         }
  94
  95   if (state->tickle_retry > 1) {
  96         msize = sizeof(aurp_hdr_t);
  97         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  98                 gbuf_wset(m,msize);
  99
 100                 /* construct the tickle packet */
 101                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 102                 hdrp->connection_id = state->rcv_connection_id;
 103                 hdrp->sequence_number = 0;
 104                 hdrp->command_code = AURPCMD_Tickle;
 105                 hdrp->flags = 0;
 106
 107                 /* send the packet */
 108                 AURPsend(m, AUD_AURP, state->rem_node);
 109         }
 110   }
 111
 112         /* start the retry timer */
 113         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 114
 115         atalk_unlock();
 116 }
 117
 118 /* */
 119 void AURPrcvTickle(state, m)
 120         aurp_state_t *state;
 121         gbuf_t *m;
 122 {
 123         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 124
 125         /* make sure we're in a valid state to accept it */
 126         if (state->snd_state == AURPSTATE_Unconnected) {
 127                 dPrintf(D_M_AURP, D_L_WARNING,
 128                         ("AURPrcvTickle: unexpected request\n"));
 129                 gbuf_freem(m);
 130                 return;
 131         }
 132
 133         /* construct the tickle ack packet */
 134         gbuf_wset(m,sizeof(aurp_hdr_t));
 135         hdrp->command_code = AURPCMD_TickleAck;
 136         hdrp->flags = 0;
 137
 138         /* send the packet */
 139         AURPsend(m, AUD_AURP, state->rem_node);
 140 }
 141
 142 /* */
 143 void AURPrcvTickleAck(state, m)
 144         aurp_state_t *state;
 145         gbuf_t *m;
 146 {
 147         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 148
 149         /* make sure we're in a valid state to accept it */
 150         if (state->rcv_state == AURPSTATE_Unconnected) {
 151                 dPrintf(D_M_AURP, D_L_WARNING,
 152                         ("AURPrcvTickleAck: unexpected response\n"));
 153                 gbuf_freem(m);
 154                 return;
 155         }
 156
 157         /* check for the correct connection id */
 158         if (hdrp->connection_id != state->rcv_connection_id) {
 159                 dPrintf(D_M_AURP, D_L_WARNING,
 160                         ("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n",
 161                         hdrp->connection_id, state->rcv_connection_id));
 162                 gbuf_freem(m);
 163                 return;
 164         }
 165         gbuf_freem(m);
 166
 167         /* update state info */
 168         state->tickle_retry = 0;
 169 }
 170
 171 #endif  /* AURP_SUPPORT */