sys/netproto/atm/uni/uniarp_timer.c

   1 /*
   2  *
   3  * ===================================
   4  * HARP  |  Host ATM Research Platform
   5  * ===================================
   6  *
   7  *
   8  * This Host ATM Research Platform ("HARP") file (the "Software") is
   9  * made available by Network Computing Services, Inc. ("NetworkCS")
  10  * "AS IS".  NetworkCS does not provide maintenance, improvements or
  11  * support of any kind.
  12  *
  13  * NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
  14  * INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
  15  * AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
  16  * SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
  17  * In no event shall NetworkCS be responsible for any damages, including
  18  * but not limited to consequential damages, arising from or relating to
  19  * any use of the Software or related support.
  20  *
  21  * Copyright 1994-1998 Network Computing Services, Inc.
  22  *
  23  * Copies of this Software may be made, however, the above copyright
  24  * notice must be reproduced on all copies.
  25  *
  26  *      @(#) $FreeBSD: src/sys/netatm/uni/uniarp_timer.c,v 1.4 2000/01/17 20:49:55 mks Exp $
  27  *      @(#) $DragonFly: src/sys/netproto/atm/uni/uniarp_timer.c,v 1.6 2006/01/14 13:36:39 swildner Exp $
  28  */
  29
  30 /*
  31  * ATM Forum UNI Support
  32  * ---------------------
  33  *
  34  * UNI ATMARP support (RFC1577) - Timer processing
  35  *
  36  */
  37
  38 #include <netproto/atm/kern_include.h>
  39
  40 #include <netproto/atm/ipatm/ipatm_var.h>
  41 #include <netproto/atm/ipatm/ipatm_serv.h>
  42 #include "uniip_var.h"
  43
  44 /*
  45  * Local functions
  46  */
  47 static void     uniarp_svc_oldage (struct uniarp *);
  48 static void     uniarp_pvc_oldage (struct uniarp *);
  49
  50
  51 /*
  52  * Process a UNI ATMARP entry timeout
  53  *
  54  * Called when a previously scheduled uniarp control block timer expires.
  55  *
  56  * Called at splnet.
  57  *
  58  * Arguments:
  59  *      tip     pointer to uniarp timer control block
  60  *
  61  * Returns:
  62  *      none
  63  *
  64  */
  65 void
  66 uniarp_timeout(struct atm_time *tip)
  67 {
  68         struct uniip    *uip;
  69         struct uniarp   *uap;
  70         struct ipvcc    *ivp;
  71
  72
  73         /*
  74          * Back-off to uniarp control block
  75          */
  76         uap = (struct uniarp *)
  77                         ((caddr_t)tip - (int)(&((struct uniarp *)0)->ua_time));
  78         uip = uap->ua_intf;
  79
  80
  81         /*
  82          * Do we know the IP address for this entry yet??
  83          */
  84         if (uap->ua_dstip.s_addr == 0) {
  85
  86                 /*
  87                  * No, then send another InATMARP_REQ on each active VCC
  88                  * associated with this entry to solicit the peer's identity.
  89                  */
  90                 for (ivp = uap->ua_ivp; ivp; ivp = ivp->iv_arpnext) {
  91                         if (ivp->iv_state != IPVCC_ACTIVE)
  92                                 continue;
  93                         uniarp_inarp_req(uip, &uap->ua_dstatm,
  94                                 &uap->ua_dstatmsub, ivp);
  95                 }
  96
  97                 /*
  98                  * Restart retry timer
  99                  */
 100                 UNIARP_TIMER(uap, UNIARP_ARP_RETRY);
 101         } else {
 102                 /*
 103                  * Yes, then we're trying to find the ATM address for this
 104                  * IP address - so send another ATMARP_REQ to the arpserver
 105                  * (if it's up at the moment)
 106                  */
 107                 if (uip->uip_arpstate == UIAS_CLIENT_ACTIVE)
 108                         uniarp_arp_req(uip, &uap->ua_dstip);
 109
 110                 /*
 111                  * Restart retry timer
 112                  */
 113                 UNIARP_TIMER(uap, UNIARP_ARP_RETRY);
 114         }
 115
 116         return;
 117 }
 118
 119
 120 /*
 121  * Process an UNI ARP SVC entry aging timer expiration
 122  *
 123  * This function is called when an SVC arp entry's aging timer has expired.
 124  *
 125  * Called at splnet().
 126  *
 127  * Arguments:
 128  *      uap     pointer to atmarp table entry
 129  *
 130  * Returns:
 131  *      none
 132  *
 133  */
 134 static void
 135 uniarp_svc_oldage(struct uniarp *uap)
 136 {
 137         struct ipvcc    *ivp, *inext;
 138         struct uniip    *uip = uap->ua_intf;
 139
 140
 141         /*
 142          * Permanent (manually installed) entries are never aged
 143          */
 144         if (uap->ua_origin >= UAO_PERM)
 145                 return;
 146
 147         /*
 148          * If entry is valid and we're out of retrys, tell
 149          * IP/ATM that the SVCs can't be used
 150          */
 151         if ((uap->ua_flags & UAF_VALID) && (uap->ua_retry-- == 0)) {
 152                 uap->ua_flags |= UAF_LOCKED;
 153                 for (ivp = uap->ua_ivp; ivp; ivp = inext) {
 154                         inext = ivp->iv_arpnext;
 155                         (*ivp->iv_ipnif->inf_arpnotify)(ivp, MAP_INVALID);
 156                 }
 157                 uap->ua_flags &= ~(UAF_LOCKED | UAF_VALID);
 158                 uap->ua_origin = 0;
 159
 160                 /*
 161                  * Delete and free an unused entry
 162                  */
 163                 if (uap->ua_ivp == NULL) {
 164                         UNIARP_CANCEL(uap);
 165                         UNIARP_DELETE(uap);
 166                         atm_free((caddr_t)uap);
 167                         return;
 168                 }
 169         }
 170
 171         /*
 172          * We want to try and refresh this entry but we don't want
 173          * to keep unused entries laying around forever.
 174          */
 175         if (uap->ua_ivp || (uap->ua_flags & UAF_USED)) {
 176                 if (uip->uip_arpstate == UIAS_CLIENT_ACTIVE) {
 177                         /*
 178                          * If we are a client (and the server VCC is active),
 179                          * then we'll ask the server for a refresh
 180                          */
 181                         uniarp_arp_req(uip, &uap->ua_dstip);
 182                 } else {
 183                         /*
 184                          * Otherwise, solicit the each active VCC peer with
 185                          * an Inverse ATMARP
 186                          */
 187                         for (ivp = uap->ua_ivp; ivp; ivp = ivp->iv_arpnext) {
 188                                 if (ivp->iv_state != IPVCC_ACTIVE)
 189                                         continue;
 190                                 uniarp_inarp_req(uip, &uap->ua_dstatm,
 191                                         &uap->ua_dstatmsub, ivp);
 192                         }
 193                 }
 194         }
 195
 196         /*
 197          * Reset timeout
 198          */
 199         if (uap->ua_flags & UAF_VALID)
 200                 uap->ua_aging = UNIARP_RETRY_AGE;
 201         else
 202                 uap->ua_aging = UNIARP_REVALID_AGE;
 203
 204         return;
 205 }
 206
 207
 208 /*
 209  * Process an UNI ARP PVC entry aging timer expiration
 210  *
 211  * This function is called when a PVC arp entry's aging timer has expired.
 212  *
 213  * Called at splnet().
 214  *
 215  * Arguments:
 216  *      uap     pointer to atmarp table entry
 217  *
 218  * Returns:
 219  *      none
 220  *
 221  */
 222 static void
 223 uniarp_pvc_oldage(struct uniarp *uap)
 224 {
 225         struct ipvcc    *ivp = uap->ua_ivp;
 226
 227         /*
 228          * If entry is valid and we're out of retrys, tell
 229          * IP/ATM that PVC can't be used
 230          */
 231         if ((uap->ua_flags & UAF_VALID) && (uap->ua_retry-- == 0)) {
 232                 (*ivp->iv_ipnif->inf_arpnotify)(ivp, MAP_INVALID);
 233                 uap->ua_flags &= ~UAF_VALID;
 234         }
 235
 236         /*
 237          * Solicit peer with Inverse ATMARP
 238          */
 239         uniarp_inarp_req(uap->ua_intf, &uap->ua_dstatm,
 240                         &uap->ua_dstatmsub, ivp);
 241
 242         /*
 243          * Reset timeout
 244          */
 245         if (uap->ua_flags & UAF_VALID)
 246                 uap->ua_aging = UNIARP_RETRY_AGE;
 247         else
 248                 uap->ua_aging = UNIARP_REVALID_AGE;
 249
 250         return;
 251 }
 252
 253
 254 /*
 255  * Process a UNI ARP aging timer tick
 256  *
 257  * This function is called every UNIARP_AGING seconds, in order to age
 258  * all the arp table entries.  If an entry's timer is expired, then the
 259  * uniarp old-age timeout function will be called for that entry.
 260  *
 261  * Called at splnet.
 262  *
 263  * Arguments:
 264  *      tip     pointer to uniarp aging timer control block
 265  *
 266  * Returns:
 267  *      none
 268  *
 269  */
 270 void
 271 uniarp_aging(struct atm_time *tip)
 272 {
 273         struct uniarp   *uap, *unext;
 274         int             i;
 275
 276
 277         /*
 278          * Schedule next timeout
 279          */
 280         atm_timeout(&uniarp_timer, UNIARP_AGING, uniarp_aging);
 281
 282         /*
 283          * Run through arp table bumping each entry's aging timer.
 284          * If an expired timer is found, process that entry.
 285          */
 286         for (i = 0; i < UNIARP_HASHSIZ; i++) {
 287                 for (uap = uniarp_arptab[i]; uap; uap = unext) {
 288                         unext = uap->ua_next;
 289
 290                         if (uap->ua_aging && --uap->ua_aging == 0)
 291                                 uniarp_svc_oldage(uap);
 292                 }
 293         }
 294
 295         /*
 296          * Check out PVC aging timers too
 297          */
 298         for (uap = uniarp_pvctab; uap; uap = unext) {
 299                 unext = uap->ua_next;
 300
 301                 if (uap->ua_aging && --uap->ua_aging == 0)
 302                         uniarp_pvc_oldage(uap);
 303         }
 304
 305         /*
 306          * Only fully resolved SVC entries need aging, so there's no need
 307          * to examine the 'no map' table
 308          */
 309 }
 310