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Annotation of kernel/bsd/netat/ddp_brt.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) 1988, 1989 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: 
        !            36: 
        !            37: /*
        !            38:  * Title:      ddp_brt.c
        !            39:  *
        !            40:  * Facility:   Best Router Caching.
        !            41:  *
        !            42:  * Author:     Kumar Vora, Creation Date: June-15-1989
        !            43:  *
        !            44:  */
        !            45: 
        !            46: #include <sysglue.h>
        !            47: #include <at/appletalk.h>
        !            48: #include <at/ddp.h>
        !            49: #include <at/elap.h>
        !            50: #include <at/at_lap.h>
        !            51: #include <at_ddp.h>
        !            52: #include <at_ddp_brt.h>
        !            53: #include <atlog.h>
        !            54: 
        !            55: 
        !            56: extern void *atalk_timeout();
        !            57: extern void atalk_untimeout();
        !            58: static void *sweep_tmo;
        !            59: 
        !            60: /* Best Router Cache */
        !            61: ddp_brt_t      at_ddp_brt[BRTSIZE];
        !            62: static u_long  ddp_brt_sweep_timer;
        !            63: 
        !            64: void
        !            65: ddp_glean(mp, ifID, src_addr)
        !            66: register gbuf_t          *mp;
        !            67: register at_if_t  *ifID;
        !            68: struct etalk_addr  *src_addr;
        !            69: {
        !            70:        register at_net_al           src_net;
        !            71: 
        !            72:        /* NOT assuming that the incoming packet is in one contiguous
        !            73:         * buffer.
        !            74:         */
        !            75: 
        !            76:        {
        !            77:                /* The interface is ethertalk, so the message is
        !            78:                 * of the form {802.3, 802.2, ddp.... }. Extract the
        !            79:                 * 802.3 source address if necessary.  Assuming, 
        !            80:                 * however, that 802.3 and 802.2 headers are in
        !            81:                 * one contiguous piece.
        !            82:                 */
        !            83:                {       register at_ddp_t    *dgp;
        !            84: 
        !            85:                        dgp = (at_ddp_t *)(gbuf_rptr(mp));
        !            86:                        src_net = NET_VALUE(dgp->src_net);
        !            87:                }
        !            88:                if (src_net >= ifID->ifThisCableStart && src_net <= ifID->ifThisCableEnd) 
        !            89:                        /* the packet has come from a net on this cable,
        !            90:                         * no need to glean router info.
        !            91:                         */
        !            92:                        return;
        !            93: 
        !            94:                if (src_addr != NULL)
        !            95:                {       register ddp_brt_t   *brt;
        !            96: 
        !            97:                        BRT_LOOK (brt, src_net);
        !            98:                        if (brt == NULL) {
        !            99:                                /* There's no BRT entry corresponding to this 
        !           100:                                 * net. Allocate a new entry.
        !           101:                                 */
        !           102:                                NEW_BRT(brt, src_net);
        !           103:                                if (brt == NULL)
        !           104:                                        /* No space available in the BRT; 
        !           105:                                         * can't glean info.
        !           106:                                         */
        !           107:                                        return;
        !           108:                                brt->net = src_net;
        !           109:                        }
        !           110:                        /*
        !           111:                         * update the router info in either case
        !           112:                         */
        !           113:                        brt->et_addr = *src_addr;
        !           114:                        brt->age_flag = BRT_VALID;
        !           115:                        brt->ifID = ifID;
        !           116:                }
        !           117:        }
        !           118: }
        !           119: 
        !           120: 
        !           121: static void    ddp_brt_sweep();
        !           122: 
        !           123: void
        !           124: ddp_brt_init()
        !           125: {
        !           126:        bzero(at_ddp_brt, sizeof(at_ddp_brt));
        !           127:        ddp_brt_sweep_timer = 1;
        !           128:        sweep_tmo = atalk_timeout(ddp_brt_sweep, (long)0, BRT_SWEEP_INT * SYS_HZ);
        !           129: }
        !           130: 
        !           131: void
        !           132: ddp_brt_shutdown()
        !           133: {
        !           134:        bzero(at_ddp_brt, sizeof(at_ddp_brt));
        !           135:        if (ddp_brt_sweep_timer)
        !           136:                atalk_untimeout(ddp_brt_sweep, 0, sweep_tmo);
        !           137:        ddp_brt_sweep_timer = 0;
        !           138: }
        !           139: 
        !           140: StaticProc void
        !           141: ddp_brt_sweep ()
        !           142: {
        !           143:         register ddp_brt_t      *brt;
        !           144:        register int            i;
        !           145: 
        !           146:        brt = at_ddp_brt;
        !           147:        for (i = 0; i < BRTSIZE; i++, brt++) {
        !           148:                switch (brt->age_flag) {
        !           149:                case BRT_EMPTY :
        !           150:                        break;
        !           151:                case BRT_VALID :
        !           152:                        brt->age_flag = BRT_GETTING_OLD;
        !           153:                        break;
        !           154:                case BRT_GETTING_OLD :
        !           155:                        bzero(brt, sizeof(ddp_brt_t));
        !           156:                        break;
        !           157:                default :
        !           158:                        ATTRACE(AT_MID_DDP,AT_SID_RESOURCE, AT_LV_ERROR, FALSE,
        !           159:                                "ddp_brt_sweep : corrupt age flag %d", 
        !           160:                                brt->age_flag, 0,0);
        !           161:                        break;
        !           162:                }
        !           163:        }
        !           164:        
        !           165:        /* set up the next sweep... */
        !           166:        sweep_tmo = atalk_timeout(ddp_brt_sweep, (long)0, BRT_SWEEP_INT * SYS_HZ);
        !           167: }
        !           168: 
        !           169: 
        !           170: 
        !           171: 

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