bsd/netat/ddp_brt.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  *      Copyright (c) 1988, 1989 Apple Computer, Inc.
  27  *
  28  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  29  */
  30
  31 #ifndef lint
  32 /* static char sccsid[] = "@(#)ddp_brt.c: 2.0, 1.7; 10/4/93; Copyright 1988-89, Apple Computer, Inc."; */
  33 #endif  /* lint */
  34
  35 /*
  36  * Title:       ddp_brt.c
  37  *
  38  * Facility:    Best Router Caching.
  39  *
  40  * Author:      Kumar Vora, Creation Date: June-15-1989
  41  *
  42  */
  43
  44 #include <sys/errno.h>
  45 #include <sys/types.h>
  46 #include <sys/param.h>
  47 #include <machine/spl.h>
  48 #include <sys/systm.h>
  49 #include <sys/kernel.h>
  50 #include <sys/proc.h>
  51 #include <sys/filedesc.h>
  52 #include <sys/fcntl.h>
  53 #include <sys/mbuf.h>
  54 #include <sys/ioctl.h>
  55 #include <sys/malloc.h>
  56 #include <sys/socket.h>
  57 #include <sys/socketvar.h>
  58 #include <sys/protosw.h>
  59
  60 #include <net/if.h>
  61
  62 #include <netat/appletalk.h>
  63 #include <netat/sysglue.h>
  64 #include <netat/ddp.h>
  65 #include <netat/at_pcb.h>
  66 #include <netat/at_var.h>
  67 #include <netat/at_ddp_brt.h>
  68 #include <netat/debug.h>
  69
  70 /* Best Router Cache */
  71 ddp_brt_t at_ddp_brt[BRTSIZE];
  72 int ddp_brt_sweep_timer;
  73
  74 void ddp_glean(mp, ifID, src_addr)
  75      register gbuf_t      *mp;
  76      register at_ifaddr_t  *ifID;
  77      struct etalk_addr  *src_addr;
  78 {
  79         register at_net_al           src_net;
  80
  81         /* NOT assuming that the incoming packet is in one contiguous
  82          * buffer.
  83          */
  84
  85         {
  86                 /* The interface is ethertalk, so the message is
  87                  * of the form {802.3, 802.2, ddp.... }. Extract the
  88                  * 802.3 source address if necessary.  Assuming,
  89                  * however, that 802.3 and 802.2 headers are in
  90                  * one contiguous piece.
  91                  */
  92                 {       register at_ddp_t    *dgp;
  93
  94                         dgp = (at_ddp_t *)(gbuf_rptr(mp));
  95                         src_net = NET_VALUE(dgp->src_net);
  96                 }
  97                 if (src_net >= ifID->ifThisCableStart && src_net <= ifID->ifThisCableEnd)
  98                         /* the packet has come from a net on this cable,
  99                          * no need to glean router info.
 100                          */
 101                         return;
 102
 103                 if (src_addr != NULL)
 104                 {       register ddp_brt_t   *brt;
 105
 106                         BRT_LOOK (brt, src_net);
 107                         if (brt == NULL) {
 108                                 /* There's no BRT entry corresponding to this
 109                                  * net. Allocate a new entry.
 110                                  */
 111                                 NEW_BRT(brt, src_net);
 112                                 if (brt == NULL)
 113                                         /* No space available in the BRT;
 114                                          * can't glean info.
 115                                          */
 116                                         return;
 117                                 brt->net = src_net;
 118                         }
 119                         /*
 120                          * update the router info in either case
 121                          */
 122                         brt->et_addr = *src_addr;
 123                         brt->age_flag = BRT_VALID;
 124                         brt->ifID = ifID;
 125                 }
 126         }
 127 }
 128
 129 void ddp_brt_init()
 130 {
 131         bzero(at_ddp_brt, sizeof(at_ddp_brt));
 132         ddp_brt_sweep_timer = 1;
 133 #ifdef NOT_USED
 134         timeout(ddp_brt_sweep_funnel, (long)0, BRT_SWEEP_INT * SYS_HZ);
 135 #endif
 136 }
 137
 138 void ddp_brt_shutdown()
 139 {
 140 #ifdef NOT_USED
 141         bzero(at_ddp_brt, sizeof(at_ddp_brt));
 142         if (ddp_brt_sweep_timer)
 143                 untimeout(ddp_brt_sweep_funnel, 0);
 144 #endif
 145         ddp_brt_sweep_timer = 0;
 146 }
 147
 148 /* funneled version */
 149 void ddp_brt_sweep_funnel()
 150 {
 151         thread_funnel_set(network_flock, TRUE);
 152         ddp_brt_sweep();
 153         thread_funnel_set(network_flock, FALSE);
 154 }
 155
 156 void ddp_brt_sweep()
 157 {
 158         register ddp_brt_t      *brt;
 159         register int            i;
 160
 161         if (ddp_brt_sweep_timer)
 162           if (++ddp_brt_sweep_timer > BRT_SWEEP_INT) {
 163             ddp_brt_sweep_timer = 1;
 164
 165             brt = at_ddp_brt;
 166             for (i = 0; i < BRTSIZE; i++, brt++) {
 167                 switch (brt->age_flag) {
 168                 case BRT_EMPTY :
 169                         break;
 170                 case BRT_VALID :
 171                         brt->age_flag = BRT_GETTING_OLD;
 172                         break;
 173                 case BRT_GETTING_OLD :
 174                         bzero(brt, sizeof(ddp_brt_t));
 175                         break;
 176                 default :
 177                         ATTRACE(AT_MID_DDP,AT_SID_RESOURCE, AT_LV_ERROR, FALSE,
 178                                 "ddp_brt_sweep : corrupt age flag %d",
 179                                 brt->age_flag, 0,0);
 180                         break;
 181                 }
 182             }
 183           }
 184 #ifdef NOT_USED
 185         /* set up the next sweep... */
 186         timeout(ddp_brt_sweep_funnel, (long)0, BRT_SWEEP_INT * SYS_HZ);
 187 #endif
 188
 189 }
 190
 191