bsd/netat/aurp_open.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  *      Copyright (c) 1996 Apple Computer, Inc.
  24  *
  25  *              Created April 8, 1996 by Tuyen Nguyen
  26  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  27  *
  28  *      File: open.c
  29  */
  30 #include <sys/errno.h>
  31 #include <sys/types.h>
  32 #include <sys/param.h>
  33 #include <machine/spl.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/proc.h>
  37 #include <sys/filedesc.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/socket.h>
  41 #include <sys/socketvar.h>
  42 #include <net/if.h>
  43
  44 #include <netat/sysglue.h>
  45 #include <netat/appletalk.h>
  46 #include <netat/at_var.h>
  47 #include <netat/routing_tables.h>
  48 #include <netat/at_pcb.h>
  49 #include <netat/aurp.h>
  50 #include <netat/debug.h>
  51
  52
  53 /* locked version of AURPsndOpenReq */
  54 void AURPsndOpenReq_locked(state)
  55         aurp_state_t *state;
  56 {
  57         atalk_lock();
  58         AURPsndOpenReq(state);
  59         atalk_unlock();
  60 }
  61
  62 /* */
  63 void AURPsndOpenReq(state)
  64         aurp_state_t *state;
  65 {
  66         int msize;
  67         gbuf_t *m;
  68         aurp_hdr_t *hdrp;
  69
  70         if (aurp_gref == 0) {
  71                 return;
  72         }
  73         if (state->rcv_retry && (state->rcv_state != AURPSTATE_WaitingForOpenRsp)) {
  74                 return;
  75         }
  76
  77         /* stop trying if the retry count exceeds the maximum value */
  78         if (++state->rcv_retry > AURP_MaxRetry) {
  79                 dPrintf(D_M_AURP, D_L_WARNING,
  80                         ("AURPsndOpenReq: no response, node %u\n",
  81                         state->rem_node));
  82                 state->rcv_state = AURPSTATE_Unconnected;
  83                 state->rcv_tmo = 0;
  84                 state->rcv_retry = 0;
  85                 return;
  86         }
  87
  88         msize = sizeof(aurp_hdr_t) + 3;
  89         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  90                 gbuf_wset(m,msize);
  91
  92                 /* construct the open request packet */
  93                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  94                 if (state->rcv_retry > 1)
  95                         hdrp->connection_id = state->rcv_connection_id;
  96                 else {
  97                         if (++rcv_connection_id == 0)
  98                                 rcv_connection_id = 1;
  99                         hdrp->connection_id = rcv_connection_id;
 100                 }
 101                 hdrp->sequence_number = 0;
 102                 hdrp->command_code = AURPCMD_OpenReq;
 103                 hdrp->flags = (AURPFLG_NA | AURPFLG_ND | AURPFLG_NDC | AURPFLG_ZC);
 104                 *(short *)(hdrp+1) = AURP_Version;
 105                 ((char *)(hdrp+1))[2] = 0; /* option count */
 106
 107                 /* update state info */
 108                 state->rcv_connection_id = hdrp->connection_id;
 109                 state->rcv_state = AURPSTATE_WaitingForOpenRsp;
 110
 111                 /* send the packet */
 112                 dPrintf(D_M_AURP, D_L_TRACE,
 113                         ("AURPsndOpenReq: sending AURPCMD_OpenReq, node %u\n",
 114                         state->rem_node));
 115                 AURPsend(m, AUD_AURP, state->rem_node);
 116         }
 117
 118         /* start the retry timer */
 119         timeout(AURPsndOpenReq_locked, state, AURP_RetryInterval*HZ);
 120         state->rcv_tmo = 1;
 121 }
 122
 123 /* */
 124 void AURPrcvOpenReq(state, m)
 125         aurp_state_t *state;
 126         gbuf_t *m;
 127 {
 128         short rc, version;
 129         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 130         unsigned short sui = hdrp->flags;
 131
 132         /* make sure we're in a valid state to accept it */
 133         if ((update_tmo == 0) || ((state->snd_state != AURPSTATE_Unconnected) &&
 134                         (state->snd_state != AURPSTATE_Connected))) {
 135                 dPrintf(D_M_AURP, D_L_WARNING,
 136                         ("AURPrcvOpenReq: unexpected request, update_tmo=0x%x, snd_state=%u\n", (unsigned int) update_tmo, state->snd_state));
 137                 gbuf_freem(m);
 138                 return;
 139         }
 140
 141         /* check for the correct version number */
 142         version = *(short *)(hdrp+1);
 143         if (version != AURP_Version) {
 144                 dPrintf(D_M_AURP, D_L_WARNING,
 145                         ("AURPrcvOpenReq: invalid version number %d, expected %d\n", version, AURP_Version));
 146                 rc = AURPERR_InvalidVersionNumber;
 147         } else
 148                 rc = (short)AURP_UpdateRate;
 149
 150         /* construct the open response packet */
 151         gbuf_wset(m,sizeof(aurp_hdr_t)+sizeof(short));
 152         hdrp->command_code = AURPCMD_OpenRsp;
 153         hdrp->flags = 0;
 154         *(short *)(hdrp+1) = rc;
 155         ((char *)(hdrp+1))[2] = 0; /* option count */
 156
 157         /*
 158          * reset if we're in the Connected state and this is
 159          * a completely new open request
 160          */
 161         if ((state->snd_state == AURPSTATE_Connected) &&
 162                 ((state->snd_connection_id != hdrp->connection_id) ||
 163                         (state->snd_sequence_number != AURP_FirstSeqNum))) {
 164                 extern void AURPsndTickle();
 165                 if (state->rcv_state == AURPSTATE_Connected) {
 166                         state->rcv_state = AURPSTATE_Unconnected;
 167                         untimeout(AURPsndTickle, state);
 168                 }
 169                 state->snd_state = AURPSTATE_Unconnected;
 170                 AURPcleanup(state);
 171                 AURPpurgeri(state->rem_node);
 172         }
 173
 174         /* update state info */
 175         if (state->snd_state == AURPSTATE_Unconnected) {
 176                 state->snd_state = AURPSTATE_Connected;
 177                 state->snd_sui = sui;
 178                 state->snd_connection_id = hdrp->connection_id;
 179                 state->snd_sequence_number = AURP_FirstSeqNum;
 180         }
 181
 182         /* send the packet */
 183         AURPsend(m, AUD_AURP, state->rem_node);
 184
 185         /* open connection for the data receiver side if not yet connected */
 186         if (state->rcv_state == AURPSTATE_Unconnected) {
 187                 state->rcv_retry = 0;
 188                 state->tickle_retry = 0;
 189                 state->rcv_sequence_number = 0;
 190                 AURPsndOpenReq(state);
 191         }
 192 }
 193
 194 /* */
 195 void AURPrcvOpenRsp(state, m)
 196         aurp_state_t *state;
 197         gbuf_t *m;
 198 {
 199         extern void AURPsndTickle();
 200         short rc;
 201         aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
 202
 203         /* make sure we're in a valid state to accept it */
 204         if (state->rcv_state != AURPSTATE_WaitingForOpenRsp) {
 205                 dPrintf(D_M_AURP, D_L_WARNING,
 206                         ("AURPrcvOpenRsp: unexpected response\n"));
 207                 gbuf_freem(m);
 208                 return;
 209         }
 210
 211         /* check for the correct connection id */
 212         if (hdrp->connection_id != state->rcv_connection_id) {
 213                 dPrintf(D_M_AURP, D_L_WARNING,
 214                         ("AURPrcvOpenRsp: invalid connection id, r=%d, m=%d\n",
 215                         hdrp->connection_id, state->rcv_connection_id));
 216                 gbuf_freem(m);
 217                 return;
 218         }
 219
 220         /* cancel the retry timer */
 221         untimeout(AURPsndOpenReq_locked, state);
 222         state->rcv_tmo = 0;
 223         state->rcv_retry = 0;
 224
 225         /* update state info */
 226         state->rcv_sequence_number = AURP_FirstSeqNum;
 227         state->rcv_env = hdrp->flags;
 228
 229         /* check for error */
 230         rc = *(short *)(hdrp+1);
 231         gbuf_freem(m);
 232         if (rc < 0) {
 233                 dPrintf(D_M_AURP, D_L_WARNING,
 234                         ("AURPrcvOpenRsp: error=%d\n", rc));
 235                 return;
 236         }
 237
 238         /* update state info */
 239         state->rcv_update_rate = (unsigned short)rc;
 240         state->rcv_state = AURPSTATE_Connected;
 241         dPrintf(D_M_AURP, D_L_TRACE, ("AURPrcvOpenRsp: moved rcv_state to AURPSTATE_Connected\n"));
 242
 243         /* start tickle */
 244         timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
 245
 246         /* get routing info */
 247         AURPsndRIReq(state);
 248 }