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