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Annotation of kernel/bsd/netat/aurp_tickle.c, revision 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:  *     File: tickle.c
        !            35:  */
        !            36: #include <sysglue.h>
        !            37: #include <at/appletalk.h>
        !            38: #include <lap.h>
        !            39: #include <routing_tables.h>
        !            40: #define _AURP
        !            41: #include <at_aurp.h>
        !            42: #include <at/aurp.h>
        !            43: 
        !            44: /* */
        !            45: void AURPsndTickle(state)
        !            46:        aurp_state_t *state;
        !            47: {
        !            48:        int msize;
        !            49:        gbuf_t *m;
        !            50:        aurp_hdr_t *hdrp;
        !            51: 
        !            52:        if (state->rcv_state == AURPSTATE_Unconnected)
        !            53:                return;
        !            54: 
        !            55:        /* stop trying if the retry count exceeds the maximum retry value */
        !            56:        if (++state->tickle_retry > AURP_MaxTickleRetry) {
        !            57:                dPrintf(D_M_AURP, D_L_WARNING,
        !            58:                        ("AURPsndTickle: no response, %d\n", state->rem_node));
        !            59:                /*
        !            60:                 * the tunnel peer seems to have disappeared, update state info
        !            61:                 */
        !            62:                state->snd_state = AURPSTATE_Unconnected;
        !            63:                state->rcv_state = AURPSTATE_Unconnected;
        !            64:                state->tickle_retry = 0;
        !            65:                AURPcleanup(state);
        !            66: 
        !            67:                /* purge all routes associated with the tunnel peer */
        !            68:                AURPpurgeri(state->rem_node);
        !            69:                return;
        !            70:        }
        !            71: 
        !            72:   if (state->tickle_retry > 1) {
        !            73:        msize = sizeof(aurp_hdr_t);
        !            74:        if ((m = (gbuf_t *)gbuf_alloc(msize, PRI_MED)) != 0) {
        !            75:                gbuf_wset(m,msize);
        !            76: 
        !            77:                /* construct the tickle packet */
        !            78:                hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !            79:                hdrp->connection_id = state->rcv_connection_id;
        !            80:                hdrp->sequence_number = 0;
        !            81:                hdrp->command_code = AURPCMD_Tickle;
        !            82:                hdrp->flags = 0;
        !            83: 
        !            84:                /* send the packet */
        !            85:                AURPsend(m, AUD_AURP, state->rem_node);
        !            86:        }
        !            87:   }
        !            88: 
        !            89:        /* start the retry timer */
        !            90:        atalk_timeout(AURPsndTickle, state, AURP_TickleRetryInterval*HZ);
        !            91: }
        !            92: 
        !            93: /* */
        !            94: void AURPrcvTickle(state, m)
        !            95:        aurp_state_t *state;
        !            96:        gbuf_t *m;
        !            97: {
        !            98:        aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !            99: 
        !           100:        /* make sure we're in a valid state to accept it */
        !           101:        if (state->snd_state == AURPSTATE_Unconnected) {
        !           102:                dPrintf(D_M_AURP, D_L_WARNING,
        !           103:                        ("AURPrcvTickle: unexpected request\n"));
        !           104:                gbuf_freem(m);
        !           105:                return;
        !           106:        }
        !           107: 
        !           108:        /* construct the tickle ack packet */
        !           109:        gbuf_wset(m,sizeof(aurp_hdr_t));
        !           110:        hdrp->command_code = AURPCMD_TickleAck;
        !           111:        hdrp->flags = 0;
        !           112: 
        !           113:        /* send the packet */
        !           114:        AURPsend(m, AUD_AURP, state->rem_node);
        !           115: }
        !           116: 
        !           117: /* */
        !           118: void AURPrcvTickleAck(state, m)
        !           119:        aurp_state_t *state;
        !           120:        gbuf_t *m;
        !           121: {
        !           122:        aurp_hdr_t *hdrp = (aurp_hdr_t *)gbuf_rptr(m);
        !           123: 
        !           124:        /* make sure we're in a valid state to accept it */
        !           125:        if (state->rcv_state == AURPSTATE_Unconnected) {
        !           126:                dPrintf(D_M_AURP, D_L_WARNING,
        !           127:                        ("AURPrcvTickleAck: unexpected response\n"));
        !           128:                gbuf_freem(m);
        !           129:                return;
        !           130:        }
        !           131: 
        !           132:        /* check for the correct connection id */
        !           133:        if (hdrp->connection_id != state->rcv_connection_id) {
        !           134:                dPrintf(D_M_AURP, D_L_WARNING,
        !           135:                        ("AURPrcvTickleAck: invalid connection id, r=%d, m=%d\n",
        !           136:                        hdrp->connection_id, state->rcv_connection_id));
        !           137:                gbuf_freem(m);
        !           138:                return;
        !           139:        }
        !           140:        gbuf_freem(m);
        !           141: 
        !           142:        /* update state info */
        !           143:        state->tickle_retry = 0;
        !           144: }

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