bsd/netat/aurp_rd.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: rd.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
  51 /* */
  52 void AURPsndRDReq(state)
  53         aurp_state_t *state;
  54 {
  55         int msize;
  56         gbuf_t *m;
  57         aurp_hdr_t *hdrp;
  58
  59         if ((state->rcv_state == AURPSTATE_Unconnected) ||
  60                         (state->snd_state == AURPSTATE_Unconnected))
  61                 return;
  62
  63         /* update state info */
  64         state->rcv_state = AURPSTATE_Unconnected;
  65         state->snd_state = AURPSTATE_Unconnected;
  66
  67         /* notify tunnel peer of router going-down for the data receiver side */
  68         msize = sizeof(aurp_hdr_t) + sizeof(short);
  69         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  70                 gbuf_wset(m,msize);
  71
  72                 /* construct the router down packet */
  73                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  74                 hdrp->connection_id = state->rcv_connection_id;
  75                 hdrp->sequence_number = 0;
  76                 hdrp->command_code = AURPCMD_RDReq;
  77                 hdrp->flags = 0;
  78                 *(short *)(hdrp+1) = AURPERR_NormalConnectionClose;
  79
  80                 /* send the packet */
  81                 AURPsend(m, AUD_AURP, state->rem_node);
  82         }
  83
  84         /* notify tunnel peer of router going-down for the data sender side */
  85         msize = sizeof(aurp_hdr_t) + sizeof(short);
  86         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  87                 gbuf_wset(m,msize);
  88
  89                 /* construct the router down packet */
  90                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  91                 hdrp->connection_id = state->snd_connection_id;
  92                 hdrp->sequence_number = state->snd_sequence_number;
  93                 hdrp->command_code = AURPCMD_RDReq;
  94                 hdrp->flags = 0;
  95                 *(short *)(hdrp+1) = AURPERR_NormalConnectionClose;
  96
  97                 /* send the packet */
  98                 AURPsend(m, AUD_AURP, state->rem_node);
  99         }
 100 }
 101
 102 /* */
 103 void AURPrcvRDReq(state, m)
 104         aurp_state_t *state;
 105         gbuf_t *m;
 106 {
 107         /* update state info */
 108         state->rcv_state = AURPSTATE_Unconnected;
 109         state->snd_state = AURPSTATE_Unconnected;
 110         AURPcleanup(state);
 111
 112         /* purge all routes associated with the tunnel peer going-down */
 113         AURPpurgeri(state->rem_node);
 114
 115         /* respond to the going-down peer with an RI Ack packet */
 116         AURPsndRIAck(state, m, 0);
 117 }