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

1.1       root        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: }

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