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 #include <sys/errno.h>
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include <machine/spl.h>
  40 #include <sys/systm.h>
  41 #include <sys/kernel.h>
  42 #include <sys/proc.h>
  43 #include <sys/filedesc.h>
  44 #include <sys/fcntl.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/socket.h>
  47 #include <sys/socketvar.h>
  48 #include <net/if.h>
  49
  50 #include <netat/sysglue.h>
  51 #include <netat/appletalk.h>
  52 #include <netat/at_var.h>
  53 #include <netat/routing_tables.h>
  54 #include <netat/at_pcb.h>
  55 #include <netat/aurp.h>
  56 #include <netat/debug.h>
  57
  58
  59 /* locked version of AURPsndOpenReq */
  60 void AURPsndOpenReq_locked(state)
  61         aurp_state_t *state;
  62 {
  63         atalk_lock();
  64         AURPsndOpenReq(state);
  65         atalk_unlock();
  66 }
  67
  68 /* */
  69 void AURPsndOpenReq(state)
  70         aurp_state_t *state;
  71 {
  72         int msize;
  73         gbuf_t *m;
  74         aurp_hdr_t *hdrp;
  75
  76         if (aurp_gref == 0) {
  77                 return;
  78         }
  79         if (state->rcv_retry && (state->rcv_state != AURPSTATE_WaitingForOpenRsp)) {
  80                 return;
  81         }
  82
  83         /* stop trying if the retry count exceeds the maximum value */
  84         if (++state->rcv_retry > AURP_MaxRetry) {
  85                 dPrintf(D_M_AURP, D_L_WARNING,
  86                         ("AURPsndOpenReq: no response, node %u\n",
  87                         state->rem_node));
  88                 state->rcv_state = AURPSTATE_Unconnected;
  89                 state->rcv_tmo = 0;
  90                 state->rcv_retry = 0;
  91                 return;
  92         }
  93
  94         msize = sizeof(aurp_hdr_t) + 3;
  95         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  96                 gbuf_wset(m,msize);
  97
  98                 /* construct the open request packet */
  99                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 100                 if (state->rcv_retry > 1)
 101                         hdrp->connection_id = state->rcv_connection_id;
 102                 else {
 103                         if (++rcv_connection_id == 0)
 104                                 rcv_connection_id = 1;
 105                         hdrp->connection_id = rcv_connection_id;
 106                 }
 107                 hdrp->sequence_number = 0;
 108                 hdrp->command_code = AURPCMD_OpenReq;
 109                 hdrp->flags = (AURPFLG_NA | AURPFLG_ND | AURPFLG_NDC | AURPFLG_ZC);
 110                 *(short *)(hdrp+1) = AURP_Version;
 111                 ((char *)(hdrp+1))[2] = 0; /* option count */
 112
 113                 /* update state info */
 114                 state->rcv_connection_id = hdrp->connection_id;
 115                 state->rcv_state = AURPSTATE_WaitingForOpenRsp;
 116
 117                 /* send the packet */
 118                 dPrintf(D_M_AURP, D_L_TRACE,
 119                         ("AURPsndOpenReq: sending AURPCMD_OpenReq, node %u\n",
 120                         state->rem_node));
 121                 AURPsend(m, AUD_AURP, state->rem_node);
 122         }
 123
 124         /* start the retry timer */
 125         timeout(AURPsndOpenReq_locked, state, AURP_RetryInterval*HZ);
 126         state->rcv_tmo = 1;
 127 }
 128
 129 /* */
 130 void AURPrcvOpenReq(state, m)
 131         aurp_state_t *state;
 132         gbuf_t *m;
 133 {
 134         short rc, version;
 135         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 136         unsigned short sui = hdrp->flags;
 137
 138         /* make sure we're in a valid state to accept it */
 139         if ((update_tmo == 0) || ((state->snd_state != AURPSTATE_Unconnected) &&
 140                         (state->snd_state != AURPSTATE_Connected))) {
 141                 dPrintf(D_M_AURP, D_L_WARNING,
 142                         ("AURPrcvOpenReq: unexpected request, update_tmo=0x%x, snd_state=%u\n", (unsigned int) update_tmo, state->snd_state));
 143                 gbuf_freem(m);
 144                 return;
 145         }
 146
 147         /* check for the correct version number */
 148         version = *(short *)(hdrp+1);
 149         if (version != AURP_Version) {
 150                 dPrintf(D_M_AURP, D_L_WARNING,
 151                         ("AURPrcvOpenReq: invalid version number %d, expected %d\n", version, AURP_Version));
 152                 rc = AURPERR_InvalidVersionNumber;
 153         } else
 154                 rc = (short)AURP_UpdateRate;
 155
 156         /* construct the open response packet */
 157         gbuf_wset(m,sizeof(aurp_hdr_t)+sizeof(short));
 158         hdrp->command_code = AURPCMD_OpenRsp;
 159         hdrp->flags = 0;
 160         *(short *)(hdrp+1) = rc;
 161         ((char *)(hdrp+1))[2] = 0; /* option count */
 162
 163         /*
 164          * reset if we're in the Connected state and this is
 165          * a completely new open request
 166          */
 167         if ((state->snd_state == AURPSTATE_Connected) &&
 168                 ((state->snd_connection_id != hdrp->connection_id) ||
 169                         (state->snd_sequence_number != AURP_FirstSeqNum))) {
 170                 extern void AURPsndTickle();
 171                 if (state->rcv_state == AURPSTATE_Connected) {
 172                         state->rcv_state = AURPSTATE_Unconnected;
 173                         untimeout(AURPsndTickle, state);
 174                 }
 175                 state->snd_state = AURPSTATE_Unconnected;
 176                 AURPcleanup(state);
 177                 AURPpurgeri(state->rem_node);
 178         }
 179
 180         /* update state info */
 181         if (state->snd_state == AURPSTATE_Unconnected) {
 182                 state->snd_state = AURPSTATE_Connected;
 183                 state->snd_sui = sui;
 184                 state->snd_connection_id = hdrp->connection_id;
 185                 state->snd_sequence_number = AURP_FirstSeqNum;
 186         }
 187
 188         /* send the packet */
 189         AURPsend(m, AUD_AURP, state->rem_node);
 190
 191         /* open connection for the data receiver side if not yet connected */
 192         if (state->rcv_state == AURPSTATE_Unconnected) {
 193                 state->rcv_retry = 0;
 194                 state->tickle_retry = 0;
 195                 state->rcv_sequence_number = 0;
 196                 AURPsndOpenReq(state);
 197         }
 198 }
 199
 200 /* */
 201 void AURPrcvOpenRsp(state, m)
 202         aurp_state_t *state;
 203         gbuf_t *m;
 204 {
 205         extern void AURPsndTickle();
 206         short rc;
 207         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 208
 209         /* make sure we're in a valid state to accept it */
 210         if (state->rcv_state != AURPSTATE_WaitingForOpenRsp) {
 211                 dPrintf(D_M_AURP, D_L_WARNING,
 212                         ("AURPrcvOpenRsp: unexpected response\n"));
 213                 gbuf_freem(m);
 214                 return;
 215         }
 216
 217         /* check for the correct connection id */
 218         if (hdrp->connection_id != state->rcv_connection_id) {
 219                 dPrintf(D_M_AURP, D_L_WARNING,
 220                         ("AURPrcvOpenRsp: invalid connection id, r=%d, m=%d\n",
 221                         hdrp->connection_id, state->rcv_connection_id));
 222                 gbuf_freem(m);
 223                 return;
 224         }
 225
 226         /* cancel the retry timer */
 227         untimeout(AURPsndOpenReq_locked, state);
 228         state->rcv_tmo = 0;
 229         state->rcv_retry = 0;
 230
 231         /* update state info */
 232         state->rcv_sequence_number = AURP_FirstSeqNum;
 233         state->rcv_env = hdrp->flags;
 234
 235         /* check for error */
 236         rc = *(short *)(hdrp+1);
 237         gbuf_freem(m);
 238         if (rc < 0) {
 239                 dPrintf(D_M_AURP, D_L_WARNING,
 240                         ("AURPrcvOpenRsp: error=%d\n", rc));
 241                 return;
 242         }
 243
 244         /* update state info */
 245         state->rcv_update_rate = (unsigned short)rc;
 246         state->rcv_state = AURPSTATE_Connected;
 247         dPrintf(D_M_AURP, D_L_TRACE, ("AURPrcvOpenRsp: moved rcv_state to AURPSTATE_Connected\n"));
 248
 249         /* start tickle */
 250         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 251
 252         /* get routing info */
 253         AURPsndRIReq(state);
 254 }