bsd/netat/aurp_tickle.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  *      Copyright (c) 1996 Apple Computer, Inc.
  27  *
  28  *              Created April 8, 1996 by Tuyen Nguyen
  29  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  30  *
  31  *      File: tickle.c
  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         boolean_t       funnel_state;
  63
  64         funnel_state = thread_funnel_set(network_flock, TRUE);
  65
  66         if (state->rcv_state == AURPSTATE_Unconnected) {
  67                 (void) thread_funnel_set(network_flock, FALSE);
  68                 return;
  69         }
  70         /* stop trying if the retry count exceeds the maximum retry value */
  71         if (++state->tickle_retry > AURP_MaxTickleRetry) {
  72                 dPrintf(D_M_AURP, D_L_WARNING,
  73                         ("AURPsndTickle: no response, %d\n", state->rem_node));
  74                 /*
  75                  * the tunnel peer seems to have disappeared, update state info
  76                  */
  77                 state->snd_state = AURPSTATE_Unconnected;
  78                 state->rcv_state = AURPSTATE_Unconnected;
  79                 state->tickle_retry = 0;
  80                 AURPcleanup(state);
  81
  82                 /* purge all routes associated with the tunnel peer */
  83                 AURPpurgeri(state->rem_node);
  84                 (void) thread_funnel_set(network_flock, FALSE);
  85                 return;
  86         }
  87
  88   if (state->tickle_retry > 1) {
  89         msize = sizeof(aurp_hdr_t);
  90         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  91                 gbuf_wset(m,msize);
  92
  93                 /* construct the tickle packet */
  94                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  95                 hdrp->connection_id = state->rcv_connection_id;
  96                 hdrp->sequence_number = 0;
  97                 hdrp->command_code = AURPCMD_Tickle;
  98                 hdrp->flags = 0;
  99
 100                 /* send the packet */
 101                 AURPsend(m, AUD_AURP, state->rem_node);
 102         }
 103   }
 104
 105         /* start the retry timer */
 106         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 107
 108         (void) thread_funnel_set(network_flock, FALSE);
 109 }
 110
 111 /* */
 112 void AURPrcvTickle(state, m)
 113         aurp_state_t *state;
 114         gbuf_t *m;
 115 {
 116         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 117
 118         /* make sure we're in a valid state to accept it */
 119         if (state->snd_state == AURPSTATE_Unconnected) {
 120                 dPrintf(D_M_AURP, D_L_WARNING,
 121                         ("AURPrcvTickle: unexpected request\n"));
 122                 gbuf_freem(m);
 123                 return;
 124         }
 125
 126         /* construct the tickle ack packet */
 127         gbuf_wset(m,sizeof(aurp_hdr_t));
 128         hdrp->command_code = AURPCMD_TickleAck;
 129         hdrp->flags = 0;
 130
 131         /* send the packet */
 132         AURPsend(m, AUD_AURP, state->rem_node);
 133 }
 134
 135 /* */
 136 void AURPrcvTickleAck(state, m)
 137         aurp_state_t *state;
 138         gbuf_t *m;
 139 {
 140         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 141
 142         /* make sure we're in a valid state to accept it */
 143         if (state->rcv_state == AURPSTATE_Unconnected) {
 144                 dPrintf(D_M_AURP, D_L_WARNING,
 145                         ("AURPrcvTickleAck: unexpected response\n"));
 146                 gbuf_freem(m);
 147                 return;
 148         }
 149
 150         /* check for the correct connection id */
 151         if (hdrp->connection_id != state->rcv_connection_id) {
 152                 dPrintf(D_M_AURP, D_L_WARNING,
 153                         ("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n",
 154                         hdrp->connection_id, state->rcv_connection_id));
 155                 gbuf_freem(m);
 156                 return;
 157         }
 158         gbuf_freem(m);
 159
 160         /* update state info */
 161         state->tickle_retry = 0;
 162 }