bsd/netat/aurp_rd.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: rd.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
  54 /* */
  55 void AURPsndRDReq(state)
  56         aurp_state_t *state;
  57 {
  58         int msize;
  59         gbuf_t *m;
  60         aurp_hdr_t *hdrp;
  61
  62         if ((state->rcv_state == AURPSTATE_Unconnected) ||
  63                         (state->snd_state == AURPSTATE_Unconnected))
  64                 return;
  65
  66         /* update state info */
  67         state->rcv_state = AURPSTATE_Unconnected;
  68         state->snd_state = AURPSTATE_Unconnected;
  69
  70         /* notify tunnel peer of router going-down for the data receiver side */
  71         msize = sizeof(aurp_hdr_t) + sizeof(short);
  72         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  73                 gbuf_wset(m,msize);
  74
  75                 /* construct the router down packet */
  76                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  77                 hdrp->connection_id = state->rcv_connection_id;
  78                 hdrp->sequence_number = 0;
  79                 hdrp->command_code = AURPCMD_RDReq;
  80                 hdrp->flags = 0;
  81                 *(short *)(hdrp+1) = AURPERR_NormalConnectionClose;
  82
  83                 /* send the packet */
  84                 AURPsend(m, AUD_AURP, state->rem_node);
  85         }
  86
  87         /* notify tunnel peer of router going-down for the data sender side */
  88         msize = sizeof(aurp_hdr_t) + sizeof(short);
  89         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  90                 gbuf_wset(m,msize);
  91
  92                 /* construct the router down packet */
  93                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  94                 hdrp->connection_id = state->snd_connection_id;
  95                 hdrp->sequence_number = state->snd_sequence_number;
  96                 hdrp->command_code = AURPCMD_RDReq;
  97                 hdrp->flags = 0;
  98                 *(short *)(hdrp+1) = AURPERR_NormalConnectionClose;
  99
 100                 /* send the packet */
 101                 AURPsend(m, AUD_AURP, state->rem_node);
 102         }
 103 }
 104
 105 /* */
 106 void AURPrcvRDReq(state, m)
 107         aurp_state_t *state;
 108         gbuf_t *m;
 109 {
 110         /* update state info */
 111         state->rcv_state = AURPSTATE_Unconnected;
 112         state->snd_state = AURPSTATE_Unconnected;
 113         AURPcleanup(state);
 114
 115         /* purge all routes associated with the tunnel peer going-down */
 116         AURPpurgeri(state->rem_node);
 117
 118         /* respond to the going-down peer with an RI Ack packet */
 119         AURPsndRIAck(state, m, 0);
 120 }