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Annotation of kernel/bsd/netat/aurp_rd.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /*
                     26:  *     Copyright (c) 1996 Apple Computer, Inc. 
                     27:  *
                     28:  *     The information contained herein is subject to change without
                     29:  *     notice and  should not be  construed as a commitment by Apple
                     30:  *     Computer, Inc. Apple Computer, Inc. assumes no responsibility
                     31:  *     for any errors that may appear.
                     32:  *
                     33:  *     Confidential and Proprietary to Apple Computer, Inc.
                     34:  *
                     35:  *     File: rd.c
                     36:  */
                     37: #include <sysglue.h>
                     38: #include <at/appletalk.h>
                     39: #include <lap.h>
                     40: #include <routing_tables.h>
                     41: #define _AURP
                     42: #include <at_aurp.h>
                     43: #include <at/aurp.h>
                     44: 
                     45: /* */
                     46: void AURPsndRDReq(state)
                     47:        aurp_state_t *state;
                     48: {
                     49:        int msize;
                     50:        gbuf_t *m;
                     51:        aurp_hdr_t *hdrp;
                     52: 
                     53:        if ((state->rcv_state == AURPSTATE_Unconnected) ||
                     54:                        (state->snd_state == AURPSTATE_Unconnected))
                     55:                return;
                     56: 
                     57:        /* update state info */
                     58:        state->rcv_state = AURPSTATE_Unconnected;
                     59:        state->snd_state = AURPSTATE_Unconnected;
                     60: 
                     61:        /* notify tunnel peer of router going-down for the data receiver side */
                     62:        msize = sizeof(aurp_hdr_t) + sizeof(short);
                     63:        if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
                     64:                gbuf_wset(m,msize);
                     65: 
                     66:                /* construct the router down packet */
                     67:                hdrp = (aurp_hdr_t *)gbuf_rptr(m);
                     68:                hdrp->connection_id = state->rcv_connection_id;
                     69:                hdrp->sequence_number = 0;
                     70:                hdrp->command_code = AURPCMD_RDReq;
                     71:                hdrp->flags = 0;
                     72:                *(short *)(hdrp+1) = AURPERR_NormalConnectionClose;
                     73: 
                     74:                /* send the packet */
                     75:                AURPsend(m, AUD_AURP, state->rem_node);
                     76:        }
                     77: 
                     78:        /* notify tunnel peer of router going-down for the data sender side */
                     79:        msize = sizeof(aurp_hdr_t) + sizeof(short);
                     80:        if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
                     81:                gbuf_wset(m,msize);
                     82: 
                     83:                /* construct the router down packet */
                     84:                hdrp = (aurp_hdr_t *)gbuf_rptr(m);
                     85:                hdrp->connection_id = state->snd_connection_id;
                     86:                hdrp->sequence_number = state->snd_sequence_number;
                     87:                hdrp->command_code = AURPCMD_RDReq;
                     88:                hdrp->flags = 0;
                     89:                *(short *)(hdrp+1) = AURPERR_NormalConnectionClose;
                     90: 
                     91:                /* send the packet */
                     92:                AURPsend(m, AUD_AURP, state->rem_node);
                     93:        }
                     94: }
                     95: 
                     96: /* */
                     97: void AURPrcvRDReq(state, m)
                     98:        aurp_state_t *state;
                     99:        gbuf_t *m;
                    100: {
                    101:        /* update state info */
                    102:        state->rcv_state = AURPSTATE_Unconnected;
                    103:        state->snd_state = AURPSTATE_Unconnected;
                    104:        AURPcleanup(state);
                    105: 
                    106:        /* purge all routes associated with the tunnel peer going-down */
                    107:        AURPpurgeri(state->rem_node);
                    108: 
                    109:        /* respond to the going-down peer with an RI Ack packet */
                    110:        AURPsndRIAck(state, m, 0);
                    111: }

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