bsd/netat/aurp_rd.c

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  *      Copyright (c) 1996 Apple Computer, Inc.
  32  *
  33  *              Created April 8, 1996 by Tuyen Nguyen
  34  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  35  *
  36  *      File: rd.c
  37  */
  38 #include <sys/errno.h>
  39 #include <sys/types.h>
  40 #include <sys/param.h>
  41 #include <machine/spl.h>
  42 #include <sys/systm.h>
  43 #include <sys/kernel.h>
  44 #include <sys/proc.h>
  45 #include <sys/filedesc.h>
  46 #include <sys/fcntl.h>
  47 #include <sys/mbuf.h>
  48 #include <sys/socket.h>
  49 #include <sys/socketvar.h>
  50 #include <net/if.h>
  51
  52 #include <netat/sysglue.h>
  53 #include <netat/appletalk.h>
  54 #include <netat/at_var.h>
  55 #include <netat/routing_tables.h>
  56 #include <netat/at_pcb.h>
  57 #include <netat/aurp.h>
  58
  59 /* */
  60 void AURPsndRDReq(state)
  61         aurp_state_t *state;
  62 {
  63         int msize;
  64         gbuf_t *m;
  65         aurp_hdr_t *hdrp;
  66
  67         if ((state->rcv_state == AURPSTATE_Unconnected) ||
  68                         (state->snd_state == AURPSTATE_Unconnected))
  69                 return;
  70
  71         /* update state info */
  72         state->rcv_state = AURPSTATE_Unconnected;
  73         state->snd_state = AURPSTATE_Unconnected;
  74
  75         /* notify tunnel peer of router going-down for the data receiver side */
  76         msize = sizeof(aurp_hdr_t) + sizeof(short);
  77         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  78                 gbuf_wset(m,msize);
  79
  80                 /* construct the router down packet */
  81                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  82                 hdrp->connection_id = state->rcv_connection_id;
  83                 hdrp->sequence_number = 0;
  84                 hdrp->command_code = AURPCMD_RDReq;
  85                 hdrp->flags = 0;
  86                 *(short *)(hdrp+1) = AURPERR_NormalConnectionClose;
  87
  88                 /* send the packet */
  89                 AURPsend(m, AUD_AURP, state->rem_node);
  90         }
  91
  92         /* notify tunnel peer of router going-down for the data sender side */
  93         msize = sizeof(aurp_hdr_t) + sizeof(short);
  94         if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
  95                 gbuf_wset(m,msize);
  96
  97                 /* construct the router down packet */
  98                 hdrp = (aurp_hdr_t *)gbuf_rptr(m);
  99                 hdrp->connection_id = state->snd_connection_id;
 100                 hdrp->sequence_number = state->snd_sequence_number;
 101                 hdrp->command_code = AURPCMD_RDReq;
 102                 hdrp->flags = 0;
 103                 *(short *)(hdrp+1) = AURPERR_NormalConnectionClose;
 104
 105                 /* send the packet */
 106                 AURPsend(m, AUD_AURP, state->rem_node);
 107         }
 108 }
 109
 110 /* */
 111 void AURPrcvRDReq(state, m)
 112         aurp_state_t *state;
 113         gbuf_t *m;
 114 {
 115         /* update state info */
 116         state->rcv_state = AURPSTATE_Unconnected;
 117         state->snd_state = AURPSTATE_Unconnected;
 118         AURPcleanup(state);
 119
 120         /* purge all routes associated with the tunnel peer going-down */
 121         AURPpurgeri(state->rem_node);
 122
 123         /* respond to the going-down peer with an RI Ack packet */
 124         AURPsndRIAck(state, m, 0);
 125 }