320 lines
6.6 KiB
C
320 lines
6.6 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*
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* @(#) $FreeBSD$
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*
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*/
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/*
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* ATM Forum UNI Support
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* ---------------------
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*
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* UNI ATMARP support (RFC1577) - Timer processing
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*
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*/
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#include <netatm/kern_include.h>
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#include <netatm/ipatm/ipatm_var.h>
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#include <netatm/ipatm/ipatm_serv.h>
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#include <netatm/uni/uniip_var.h>
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#ifndef lint
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__RCSID("@(#) $FreeBSD$");
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#endif
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/*
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* Local functions
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*/
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static void uniarp_svc_oldage __P((struct uniarp *));
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static void uniarp_pvc_oldage __P((struct uniarp *));
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/*
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* Process a UNI ATMARP entry timeout
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*
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* Called when a previously scheduled uniarp control block timer expires.
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*
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* Called at splnet.
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*
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* Arguments:
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* tip pointer to uniarp timer control block
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*
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* Returns:
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* none
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*
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*/
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void
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uniarp_timeout(tip)
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struct atm_time *tip;
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{
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struct uniip *uip;
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struct uniarp *uap;
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struct ipvcc *ivp;
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/*
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* Back-off to uniarp control block
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*/
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uap = (struct uniarp *)
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((caddr_t)tip - (int)(&((struct uniarp *)0)->ua_time));
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uip = uap->ua_intf;
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/*
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* Do we know the IP address for this entry yet??
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*/
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if (uap->ua_dstip.s_addr == 0) {
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/*
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* No, then send another InATMARP_REQ on each active VCC
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* associated with this entry to solicit the peer's identity.
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*/
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for (ivp = uap->ua_ivp; ivp; ivp = ivp->iv_arpnext) {
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if (ivp->iv_state != IPVCC_ACTIVE)
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continue;
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(void) uniarp_inarp_req(uip, &uap->ua_dstatm,
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&uap->ua_dstatmsub, ivp);
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}
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/*
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* Restart retry timer
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*/
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UNIARP_TIMER(uap, UNIARP_ARP_RETRY);
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} else {
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/*
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* Yes, then we're trying to find the ATM address for this
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* IP address - so send another ATMARP_REQ to the arpserver
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* (if it's up at the moment)
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*/
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if (uip->uip_arpstate == UIAS_CLIENT_ACTIVE)
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(void) uniarp_arp_req(uip, &uap->ua_dstip);
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/*
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* Restart retry timer
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*/
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UNIARP_TIMER(uap, UNIARP_ARP_RETRY);
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}
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return;
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}
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/*
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* Process an UNI ARP SVC entry aging timer expiration
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*
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* This function is called when an SVC arp entry's aging timer has expired.
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*
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* Called at splnet().
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*
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* Arguments:
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* uap pointer to atmarp table entry
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*
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* Returns:
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* none
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*
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*/
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static void
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uniarp_svc_oldage(uap)
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struct uniarp *uap;
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{
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struct ipvcc *ivp, *inext;
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struct uniip *uip = uap->ua_intf;
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/*
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* Permanent (manually installed) entries are never aged
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*/
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if (uap->ua_origin >= UAO_PERM)
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return;
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/*
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* If entry is valid and we're out of retrys, tell
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* IP/ATM that the SVCs can't be used
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*/
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if ((uap->ua_flags & UAF_VALID) && (uap->ua_retry-- == 0)) {
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uap->ua_flags |= UAF_LOCKED;
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for (ivp = uap->ua_ivp; ivp; ivp = inext) {
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inext = ivp->iv_arpnext;
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(*ivp->iv_ipnif->inf_arpnotify)(ivp, MAP_INVALID);
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}
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uap->ua_flags &= ~(UAF_LOCKED | UAF_VALID);
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uap->ua_origin = 0;
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/*
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* Delete and free an unused entry
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*/
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if (uap->ua_ivp == NULL) {
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UNIARP_CANCEL(uap);
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UNIARP_DELETE(uap);
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atm_free((caddr_t)uap);
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return;
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}
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}
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/*
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* We want to try and refresh this entry but we don't want
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* to keep unused entries laying around forever.
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*/
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if (uap->ua_ivp || (uap->ua_flags & UAF_USED)) {
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if (uip->uip_arpstate == UIAS_CLIENT_ACTIVE) {
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/*
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* If we are a client (and the server VCC is active),
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* then we'll ask the server for a refresh
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*/
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(void) uniarp_arp_req(uip, &uap->ua_dstip);
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} else {
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/*
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* Otherwise, solicit the each active VCC peer with
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* an Inverse ATMARP
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*/
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for (ivp = uap->ua_ivp; ivp; ivp = ivp->iv_arpnext) {
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if (ivp->iv_state != IPVCC_ACTIVE)
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continue;
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(void) uniarp_inarp_req(uip, &uap->ua_dstatm,
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&uap->ua_dstatmsub, ivp);
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}
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}
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}
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/*
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* Reset timeout
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*/
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if (uap->ua_flags & UAF_VALID)
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uap->ua_aging = UNIARP_RETRY_AGE;
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else
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uap->ua_aging = UNIARP_REVALID_AGE;
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return;
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}
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/*
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* Process an UNI ARP PVC entry aging timer expiration
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*
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* This function is called when a PVC arp entry's aging timer has expired.
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*
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* Called at splnet().
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*
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* Arguments:
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* uap pointer to atmarp table entry
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*
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* Returns:
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* none
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*
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*/
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static void
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uniarp_pvc_oldage(uap)
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struct uniarp *uap;
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{
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struct ipvcc *ivp = uap->ua_ivp;
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/*
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* If entry is valid and we're out of retrys, tell
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* IP/ATM that PVC can't be used
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*/
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if ((uap->ua_flags & UAF_VALID) && (uap->ua_retry-- == 0)) {
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(*ivp->iv_ipnif->inf_arpnotify)(ivp, MAP_INVALID);
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uap->ua_flags &= ~UAF_VALID;
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}
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/*
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* Solicit peer with Inverse ATMARP
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*/
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(void) uniarp_inarp_req(uap->ua_intf, &uap->ua_dstatm,
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&uap->ua_dstatmsub, ivp);
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/*
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* Reset timeout
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*/
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if (uap->ua_flags & UAF_VALID)
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uap->ua_aging = UNIARP_RETRY_AGE;
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else
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uap->ua_aging = UNIARP_REVALID_AGE;
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return;
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}
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/*
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* Process a UNI ARP aging timer tick
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*
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* This function is called every UNIARP_AGING seconds, in order to age
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* all the arp table entries. If an entry's timer is expired, then the
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* uniarp old-age timeout function will be called for that entry.
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*
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* Called at splnet.
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*
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* Arguments:
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* tip pointer to uniarp aging timer control block
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*
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* Returns:
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* none
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*
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*/
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void
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uniarp_aging(tip)
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struct atm_time *tip;
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{
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struct uniarp *uap, *unext;
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int i;
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/*
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* Schedule next timeout
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*/
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atm_timeout(&uniarp_timer, UNIARP_AGING, uniarp_aging);
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/*
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* Run through arp table bumping each entry's aging timer.
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* If an expired timer is found, process that entry.
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*/
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for (i = 0; i < UNIARP_HASHSIZ; i++) {
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for (uap = uniarp_arptab[i]; uap; uap = unext) {
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unext = uap->ua_next;
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if (uap->ua_aging && --uap->ua_aging == 0)
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uniarp_svc_oldage(uap);
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}
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}
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/*
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* Check out PVC aging timers too
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*/
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for (uap = uniarp_pvctab; uap; uap = unext) {
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unext = uap->ua_next;
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if (uap->ua_aging && --uap->ua_aging == 0)
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uniarp_pvc_oldage(uap);
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}
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/*
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* Only fully resolved SVC entries need aging, so there's no need
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* to examine the 'no map' table
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*/
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}
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