bsd/netat/aurp_tickle.c

   1 /*
   2  * Copyright (c) 2006 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 #include <sys/errno.h>
  39 #include <sys/types.h>
  40 #include <sys/param.h>
  41 #include <machine/spl.h>
  42 #include <sys/systm.h>
  43 #include <sys/kernel.h>
  44 #include <sys/proc.h>
  45 #include <sys/filedesc.h>
  46 #include <sys/fcntl.h>
  47 #include <sys/mbuf.h>
  48 #include <sys/socket.h>
  49 #include <sys/socketvar.h>
  50 #include <net/if.h>
  51
  52 #include <netat/sysglue.h>
  53 #include <netat/appletalk.h>
  54 #include <netat/at_var.h>
  55 #include <netat/routing_tables.h>
  56 #include <netat/at_pcb.h>
  57 #include <netat/aurp.h>
  58 #include <netat/debug.h>
  59
  60 /* */
  61 void AURPsndTickle(state)
  62         aurp_state_t *state;
  63 {
  64         int msize;
  65         gbuf_t *m;
  66         aurp_hdr_t *hdrp;
  67
  68         atalk_lock();
  69
  70         if (state->rcv_state == AURPSTATE_Unconnected) {
  71                 atalk_unlock();
  72                 return;
  73         }
  74         /* stop trying if the retry count exceeds the maximum retry value */
  75         if (++state->tickle_retry > AURP_MaxTickleRetry) {
  76                 dPrintf(D_M_AURP, D_L_WARNING,
  77                         ("AURPsndTickle: no response, %d\n", state->rem_node));
  78                 /*
  79                  * the tunnel peer seems to have disappeared, update state info
  80                  */
  81                 state->snd_state = AURPSTATE_Unconnected;
  82                 state->rcv_state = AURPSTATE_Unconnected;
  83                 state->tickle_retry = 0;
  84                 AURPcleanup(state);
  85
  86                 /* purge all routes associated with the tunnel peer */
  87                 AURPpurgeri(state->rem_node);
  88                 atalk_unlock();
  89                 return;
  90         }
  91
  92   if (state->tickle_retry > 1) {
  93         msize = sizeof(aurp_hdr_t);
  94         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  95                 gbuf_wset(m,msize);
  96
  97                 /* construct the tickle packet */
  98                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  99                 hdrp->connection_id = state->rcv_connection_id;
 100                 hdrp->sequence_number = 0;
 101                 hdrp->command_code = AURPCMD_Tickle;
 102                 hdrp->flags = 0;
 103
 104                 /* send the packet */
 105                 AURPsend(m, AUD_AURP, state->rem_node);
 106         }
 107   }
 108
 109         /* start the retry timer */
 110         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 111
 112         atalk_unlock();
 113 }
 114
 115 /* */
 116 void AURPrcvTickle(state, m)
 117         aurp_state_t *state;
 118         gbuf_t *m;
 119 {
 120         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 121
 122         /* make sure we're in a valid state to accept it */
 123         if (state->snd_state == AURPSTATE_Unconnected) {
 124                 dPrintf(D_M_AURP, D_L_WARNING,
 125                         ("AURPrcvTickle: unexpected request\n"));
 126                 gbuf_freem(m);
 127                 return;
 128         }
 129
 130         /* construct the tickle ack packet */
 131         gbuf_wset(m,sizeof(aurp_hdr_t));
 132         hdrp->command_code = AURPCMD_TickleAck;
 133         hdrp->flags = 0;
 134
 135         /* send the packet */
 136         AURPsend(m, AUD_AURP, state->rem_node);
 137 }
 138
 139 /* */
 140 void AURPrcvTickleAck(state, m)
 141         aurp_state_t *state;
 142         gbuf_t *m;
 143 {
 144         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 145
 146         /* make sure we're in a valid state to accept it */
 147         if (state->rcv_state == AURPSTATE_Unconnected) {
 148                 dPrintf(D_M_AURP, D_L_WARNING,
 149                         ("AURPrcvTickleAck: unexpected response\n"));
 150                 gbuf_freem(m);
 151                 return;
 152         }
 153
 154         /* check for the correct connection id */
 155         if (hdrp->connection_id != state->rcv_connection_id) {
 156                 dPrintf(D_M_AURP, D_L_WARNING,
 157                         ("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n",
 158                         hdrp->connection_id, state->rcv_connection_id));
 159                 gbuf_freem(m);
 160                 return;
 161         }
 162         gbuf_freem(m);
 163
 164         /* update state info */
 165         state->tickle_retry = 0;
 166 }