bsd/netat/aurp_open.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  *      Copyright (c) 1996 Apple Computer, Inc.
  30  *
  31  *              Created April 8, 1996 by Tuyen Nguyen
  32  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  33  *
  34  *      File: open.c
  35  */
  36
  37 #ifdef AURP_SUPPORT
  38
  39 #include <sys/errno.h>
  40 #include <sys/types.h>
  41 #include <sys/param.h>
  42 #include <machine/spl.h>
  43 #include <sys/systm.h>
  44 #include <sys/kernel.h>
  45 #include <sys/proc.h>
  46 #include <sys/filedesc.h>
  47 #include <sys/fcntl.h>
  48 #include <sys/mbuf.h>
  49 #include <sys/socket.h>
  50 #include <sys/socketvar.h>
  51 #include <net/if.h>
  52
  53 #include <netat/sysglue.h>
  54 #include <netat/appletalk.h>
  55 #include <netat/at_pcb.h>
  56 #include <netat/at_var.h>
  57 #include <netat/routing_tables.h>
  58 #include <netat/aurp.h>
  59 #include <netat/debug.h>
  60
  61
  62 /* locked version of AURPsndOpenReq */
  63 void AURPsndOpenReq_locked(state)
  64         aurp_state_t *state;
  65 {
  66         atalk_lock();
  67         AURPsndOpenReq(state);
  68         atalk_unlock();
  69 }
  70
  71 /* */
  72 void AURPsndOpenReq(state)
  73         aurp_state_t *state;
  74 {
  75         int msize;
  76         gbuf_t *m;
  77         aurp_hdr_t *hdrp;
  78
  79         if (aurp_gref == 0) {
  80                 return;
  81         }
  82         if (state->rcv_retry && (state->rcv_state != AURPSTATE_WaitingForOpenRsp)) {
  83                 return;
  84         }
  85
  86         /* stop trying if the retry count exceeds the maximum value */
  87         if (++state->rcv_retry > AURP_MaxRetry) {
  88                 dPrintf(D_M_AURP, D_L_WARNING,
  89                         ("AURPsndOpenReq: no response, node %u\n",
  90                         state->rem_node));
  91                 state->rcv_state = AURPSTATE_Unconnected;
  92                 state->rcv_tmo = 0;
  93                 state->rcv_retry = 0;
  94                 return;
  95         }
  96
  97         msize = sizeof(aurp_hdr_t) + 3;
  98         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  99                 gbuf_wset(m,msize);
 100
 101                 /* construct the open request packet */
 102                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 103                 if (state->rcv_retry > 1)
 104                         hdrp->connection_id = state->rcv_connection_id;
 105                 else {
 106                         if (++rcv_connection_id == 0)
 107                                 rcv_connection_id = 1;
 108                         hdrp->connection_id = rcv_connection_id;
 109                 }
 110                 hdrp->sequence_number = 0;
 111                 hdrp->command_code = AURPCMD_OpenReq;
 112                 hdrp->flags = (AURPFLG_NA | AURPFLG_ND | AURPFLG_NDC | AURPFLG_ZC);
 113                 *(short *)(hdrp+1) = AURP_Version;
 114                 ((char *)(hdrp+1))[2] = 0; /* option count */
 115
 116                 /* update state info */
 117                 state->rcv_connection_id = hdrp->connection_id;
 118                 state->rcv_state = AURPSTATE_WaitingForOpenRsp;
 119
 120                 /* send the packet */
 121                 dPrintf(D_M_AURP, D_L_TRACE,
 122                         ("AURPsndOpenReq: sending AURPCMD_OpenReq, node %u\n",
 123                         state->rem_node));
 124                 AURPsend(m, AUD_AURP, state->rem_node);
 125         }
 126
 127         /* start the retry timer */
 128         timeout(AURPsndOpenReq_locked, state, AURP_RetryInterval*HZ);
 129         state->rcv_tmo = 1;
 130 }
 131
 132 /* */
 133 void AURPrcvOpenReq(state, m)
 134         aurp_state_t *state;
 135         gbuf_t *m;
 136 {
 137         short rc, version;
 138         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 139         unsigned short sui = hdrp->flags;
 140
 141         /* make sure we're in a valid state to accept it */
 142         if ((update_tmo == 0) || ((state->snd_state != AURPSTATE_Unconnected) &&
 143                         (state->snd_state != AURPSTATE_Connected))) {
 144                 dPrintf(D_M_AURP, D_L_WARNING,
 145                         ("AURPrcvOpenReq: unexpected request, update_tmo=0x%x, snd_state=%u\n", (unsigned int) update_tmo, state->snd_state));
 146                 gbuf_freem(m);
 147                 return;
 148         }
 149
 150         /* check for the correct version number */
 151         version = *(short *)(hdrp+1);
 152         if (version != AURP_Version) {
 153                 dPrintf(D_M_AURP, D_L_WARNING,
 154                         ("AURPrcvOpenReq: invalid version number %d, expected %d\n", version, AURP_Version));
 155                 rc = AURPERR_InvalidVersionNumber;
 156         } else
 157                 rc = (short)AURP_UpdateRate;
 158
 159         /* construct the open response packet */
 160         gbuf_wset(m,sizeof(aurp_hdr_t)+sizeof(short));
 161         hdrp->command_code = AURPCMD_OpenRsp;
 162         hdrp->flags = 0;
 163         *(short *)(hdrp+1) = rc;
 164         ((char *)(hdrp+1))[2] = 0; /* option count */
 165
 166         /*
 167          * reset if we're in the Connected state and this is
 168          * a completely new open request
 169          */
 170         if ((state->snd_state == AURPSTATE_Connected) &&
 171                 ((state->snd_connection_id != hdrp->connection_id) ||
 172                         (state->snd_sequence_number != AURP_FirstSeqNum))) {
 173                 extern void AURPsndTickle();
 174                 if (state->rcv_state == AURPSTATE_Connected) {
 175                         state->rcv_state = AURPSTATE_Unconnected;
 176                         untimeout(AURPsndTickle, state);
 177                 }
 178                 state->snd_state = AURPSTATE_Unconnected;
 179                 AURPcleanup(state);
 180                 AURPpurgeri(state->rem_node);
 181         }
 182
 183         /* update state info */
 184         if (state->snd_state == AURPSTATE_Unconnected) {
 185                 state->snd_state = AURPSTATE_Connected;
 186                 state->snd_sui = sui;
 187                 state->snd_connection_id = hdrp->connection_id;
 188                 state->snd_sequence_number = AURP_FirstSeqNum;
 189         }
 190
 191         /* send the packet */
 192         AURPsend(m, AUD_AURP, state->rem_node);
 193
 194         /* open connection for the data receiver side if not yet connected */
 195         if (state->rcv_state == AURPSTATE_Unconnected) {
 196                 state->rcv_retry = 0;
 197                 state->tickle_retry = 0;
 198                 state->rcv_sequence_number = 0;
 199                 AURPsndOpenReq(state);
 200         }
 201 }
 202
 203 /* */
 204 void AURPrcvOpenRsp(state, m)
 205         aurp_state_t *state;
 206         gbuf_t *m;
 207 {
 208         extern void AURPsndTickle();
 209         short rc;
 210         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 211
 212         /* make sure we're in a valid state to accept it */
 213         if (state->rcv_state != AURPSTATE_WaitingForOpenRsp) {
 214                 dPrintf(D_M_AURP, D_L_WARNING,
 215                         ("AURPrcvOpenRsp: unexpected response\n"));
 216                 gbuf_freem(m);
 217                 return;
 218         }
 219
 220         /* check for the correct connection id */
 221         if (hdrp->connection_id != state->rcv_connection_id) {
 222                 dPrintf(D_M_AURP, D_L_WARNING,
 223                         ("AURPrcvOpenRsp: invalid connection id, r=%d, m=%d\n",
 224                         hdrp->connection_id, state->rcv_connection_id));
 225                 gbuf_freem(m);
 226                 return;
 227         }
 228
 229         /* cancel the retry timer */
 230         untimeout(AURPsndOpenReq_locked, state);
 231         state->rcv_tmo = 0;
 232         state->rcv_retry = 0;
 233
 234         /* update state info */
 235         state->rcv_sequence_number = AURP_FirstSeqNum;
 236         state->rcv_env = hdrp->flags;
 237
 238         /* check for error */
 239         rc = *(short *)(hdrp+1);
 240         gbuf_freem(m);
 241         if (rc < 0) {
 242                 dPrintf(D_M_AURP, D_L_WARNING,
 243                         ("AURPrcvOpenRsp: error=%d\n", rc));
 244                 return;
 245         }
 246
 247         /* update state info */
 248         state->rcv_update_rate = (unsigned short)rc;
 249         state->rcv_state = AURPSTATE_Connected;
 250         dPrintf(D_M_AURP, D_L_TRACE, ("AURPrcvOpenRsp: moved rcv_state to AURPSTATE_Connected\n"));
 251
 252         /* start tickle */
 253         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 254
 255         /* get routing info */
 256         AURPsndRIReq(state);
 257 }
 258
 259 #endif  /* AURP_SUPPORT */