bsd/netat/aurp_open.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  *      Copyright (c) 1996 Apple Computer, Inc.
  25  *
  26  *              Created April 8, 1996 by Tuyen Nguyen
  27  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  28  *
  29  *      File: open.c
  30  */
  31 #include <sys/errno.h>
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34 #include <machine/spl.h>
  35 #include <sys/systm.h>
  36 #include <sys/kernel.h>
  37 #include <sys/proc.h>
  38 #include <sys/filedesc.h>
  39 #include <sys/fcntl.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/socket.h>
  42 #include <sys/socketvar.h>
  43 #include <net/if.h>
  44
  45 #include <netat/sysglue.h>
  46 #include <netat/appletalk.h>
  47 #include <netat/at_var.h>
  48 #include <netat/routing_tables.h>
  49 #include <netat/at_pcb.h>
  50 #include <netat/aurp.h>
  51 #include <netat/debug.h>
  52
  53
  54 /* locked version of AURPsndOpenReq */
  55 void AURPsndOpenReq_locked(state)
  56         aurp_state_t *state;
  57 {
  58         atalk_lock();
  59         AURPsndOpenReq(state);
  60         atalk_unlock();
  61 }
  62
  63 /* */
  64 void AURPsndOpenReq(state)
  65         aurp_state_t *state;
  66 {
  67         int msize;
  68         gbuf_t *m;
  69         aurp_hdr_t *hdrp;
  70
  71         if (aurp_gref == 0) {
  72                 return;
  73         }
  74         if (state->rcv_retry && (state->rcv_state != AURPSTATE_WaitingForOpenRsp)) {
  75                 return;
  76         }
  77
  78         /* stop trying if the retry count exceeds the maximum value */
  79         if (++state->rcv_retry > AURP_MaxRetry) {
  80                 dPrintf(D_M_AURP, D_L_WARNING,
  81                         ("AURPsndOpenReq: no response, node %u\n",
  82                         state->rem_node));
  83                 state->rcv_state = AURPSTATE_Unconnected;
  84                 state->rcv_tmo = 0;
  85                 state->rcv_retry = 0;
  86                 return;
  87         }
  88
  89         msize = sizeof(aurp_hdr_t) + 3;
  90         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  91                 gbuf_wset(m,msize);
  92
  93                 /* construct the open request packet */
  94                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  95                 if (state->rcv_retry > 1)
  96                         hdrp->connection_id = state->rcv_connection_id;
  97                 else {
  98                         if (++rcv_connection_id == 0)
  99                                 rcv_connection_id = 1;
 100                         hdrp->connection_id = rcv_connection_id;
 101                 }
 102                 hdrp->sequence_number = 0;
 103                 hdrp->command_code = AURPCMD_OpenReq;
 104                 hdrp->flags = (AURPFLG_NA | AURPFLG_ND | AURPFLG_NDC | AURPFLG_ZC);
 105                 *(short *)(hdrp+1) = AURP_Version;
 106                 ((char *)(hdrp+1))[2] = 0; /* option count */
 107
 108                 /* update state info */
 109                 state->rcv_connection_id = hdrp->connection_id;
 110                 state->rcv_state = AURPSTATE_WaitingForOpenRsp;
 111
 112                 /* send the packet */
 113                 dPrintf(D_M_AURP, D_L_TRACE,
 114                         ("AURPsndOpenReq: sending AURPCMD_OpenReq, node %u\n",
 115                         state->rem_node));
 116                 AURPsend(m, AUD_AURP, state->rem_node);
 117         }
 118
 119         /* start the retry timer */
 120         timeout(AURPsndOpenReq_locked, state, AURP_RetryInterval*HZ);
 121         state->rcv_tmo = 1;
 122 }
 123
 124 /* */
 125 void AURPrcvOpenReq(state, m)
 126         aurp_state_t *state;
 127         gbuf_t *m;
 128 {
 129         short rc, version;
 130         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 131         unsigned short sui = hdrp->flags;
 132
 133         /* make sure we're in a valid state to accept it */
 134         if ((update_tmo == 0) || ((state->snd_state != AURPSTATE_Unconnected) &&
 135                         (state->snd_state != AURPSTATE_Connected))) {
 136                 dPrintf(D_M_AURP, D_L_WARNING,
 137                         ("AURPrcvOpenReq: unexpected request, update_tmo=0x%x, snd_state=%u\n", (unsigned int) update_tmo, state->snd_state));
 138                 gbuf_freem(m);
 139                 return;
 140         }
 141
 142         /* check for the correct version number */
 143         version = *(short *)(hdrp+1);
 144         if (version != AURP_Version) {
 145                 dPrintf(D_M_AURP, D_L_WARNING,
 146                         ("AURPrcvOpenReq: invalid version number %d, expected %d\n", version, AURP_Version));
 147                 rc = AURPERR_InvalidVersionNumber;
 148         } else
 149                 rc = (short)AURP_UpdateRate;
 150
 151         /* construct the open response packet */
 152         gbuf_wset(m,sizeof(aurp_hdr_t)+sizeof(short));
 153         hdrp->command_code = AURPCMD_OpenRsp;
 154         hdrp->flags = 0;
 155         *(short *)(hdrp+1) = rc;
 156         ((char *)(hdrp+1))[2] = 0; /* option count */
 157
 158         /*
 159          * reset if we're in the Connected state and this is
 160          * a completely new open request
 161          */
 162         if ((state->snd_state == AURPSTATE_Connected) &&
 163                 ((state->snd_connection_id != hdrp->connection_id) ||
 164                         (state->snd_sequence_number != AURP_FirstSeqNum))) {
 165                 extern void AURPsndTickle();
 166                 if (state->rcv_state == AURPSTATE_Connected) {
 167                         state->rcv_state = AURPSTATE_Unconnected;
 168                         untimeout(AURPsndTickle, state);
 169                 }
 170                 state->snd_state = AURPSTATE_Unconnected;
 171                 AURPcleanup(state);
 172                 AURPpurgeri(state->rem_node);
 173         }
 174
 175         /* update state info */
 176         if (state->snd_state == AURPSTATE_Unconnected) {
 177                 state->snd_state = AURPSTATE_Connected;
 178                 state->snd_sui = sui;
 179                 state->snd_connection_id = hdrp->connection_id;
 180                 state->snd_sequence_number = AURP_FirstSeqNum;
 181         }
 182
 183         /* send the packet */
 184         AURPsend(m, AUD_AURP, state->rem_node);
 185
 186         /* open connection for the data receiver side if not yet connected */
 187         if (state->rcv_state == AURPSTATE_Unconnected) {
 188                 state->rcv_retry = 0;
 189                 state->tickle_retry = 0;
 190                 state->rcv_sequence_number = 0;
 191                 AURPsndOpenReq(state);
 192         }
 193 }
 194
 195 /* */
 196 void AURPrcvOpenRsp(state, m)
 197         aurp_state_t *state;
 198         gbuf_t *m;
 199 {
 200         extern void AURPsndTickle();
 201         short rc;
 202         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 203
 204         /* make sure we're in a valid state to accept it */
 205         if (state->rcv_state != AURPSTATE_WaitingForOpenRsp) {
 206                 dPrintf(D_M_AURP, D_L_WARNING,
 207                         ("AURPrcvOpenRsp: unexpected response\n"));
 208                 gbuf_freem(m);
 209                 return;
 210         }
 211
 212         /* check for the correct connection id */
 213         if (hdrp->connection_id != state->rcv_connection_id) {
 214                 dPrintf(D_M_AURP, D_L_WARNING,
 215                         ("AURPrcvOpenRsp: invalid connection id, r=%d, m=%d\n",
 216                         hdrp->connection_id, state->rcv_connection_id));
 217                 gbuf_freem(m);
 218                 return;
 219         }
 220
 221         /* cancel the retry timer */
 222         untimeout(AURPsndOpenReq_locked, state);
 223         state->rcv_tmo = 0;
 224         state->rcv_retry = 0;
 225
 226         /* update state info */
 227         state->rcv_sequence_number = AURP_FirstSeqNum;
 228         state->rcv_env = hdrp->flags;
 229
 230         /* check for error */
 231         rc = *(short *)(hdrp+1);
 232         gbuf_freem(m);
 233         if (rc < 0) {
 234                 dPrintf(D_M_AURP, D_L_WARNING,
 235                         ("AURPrcvOpenRsp: error=%d\n", rc));
 236                 return;
 237         }
 238
 239         /* update state info */
 240         state->rcv_update_rate = (unsigned short)rc;
 241         state->rcv_state = AURPSTATE_Connected;
 242         dPrintf(D_M_AURP, D_L_TRACE, ("AURPrcvOpenRsp: moved rcv_state to AURPSTATE_Connected\n"));
 243
 244         /* start tickle */
 245         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 246
 247         /* get routing info */
 248         AURPsndRIReq(state);
 249 }