455 lines
8.9 KiB
C
455 lines
8.9 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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* @(#) $Id: ipatm_event.c,v 1.2 1998/09/17 09:35:00 phk Exp $
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*
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*/
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/*
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* IP Over ATM Support
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* -------------------
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*
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* IP VCC event handler
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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.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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#ifndef lint
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__RCSID("@(#) $Id: ipatm_event.c,v 1.2 1998/09/17 09:35:00 phk Exp $");
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#endif
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/*
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* Process an IP VCC timeout
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*
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* Called when a previously scheduled ipvcc control block timer expires.
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* Processing will be based on the current ipvcc state.
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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 ipvcc 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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ipatm_timeout(tip)
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struct atm_time *tip;
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{
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struct ipvcc *ivp;
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/*
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* Back-off to ipvcc control block
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*/
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ivp = (struct ipvcc *)
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((caddr_t)tip - (int)(&((struct ipvcc *)0)->iv_time));
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/*
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* Process timeout based on protocol state
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*/
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switch (ivp->iv_state) {
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case IPVCC_PMAP:
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/*
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* Give up waiting for arp response
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*/
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(void) ipatm_closevc(ivp, T_ATM_CAUSE_TEMPORARY_FAILURE);
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break;
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case IPVCC_POPEN:
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case IPVCC_PACCEPT:
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/*
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* Give up waiting for signalling manager response
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*/
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(void) ipatm_closevc(ivp, T_ATM_CAUSE_TEMPORARY_FAILURE);
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break;
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case IPVCC_ACTPENT:
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/*
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* Try again to get an ARP entry
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*/
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switch ((*ivp->iv_ipnif->inf_serv->is_arp_pvcopen)(ivp)) {
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case MAP_PROCEEDING:
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/*
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* Wait for answer
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*/
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ivp->iv_state = IPVCC_ACTIVE;
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break;
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case MAP_VALID:
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/*
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* We've got our answer already
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*/
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ivp->iv_state = IPVCC_ACTIVE;
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ivp->iv_flags |= IVF_MAPOK;
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ivp->iv_dst.s_addr = ivp->iv_arpent->am_dstip.s_addr;
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break;
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case MAP_FAILED:
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/*
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* Try again later
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*/
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IPVCC_TIMER(ivp, 5 * ATM_HZ);
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break;
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default:
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panic("ipatm_timeout: invalid am_pvcopen return");
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}
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break;
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default:
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log(LOG_ERR, "ipatm: invalid timer state: ivp=%p, state=%d\n",
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ivp, ivp->iv_state);
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}
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}
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/*
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* Process IP VCC Connected Notification
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*
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* Arguments:
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* toku owner's connection token (ipvcc protocol 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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ipatm_connected(toku)
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void *toku;
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{
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struct ipvcc *ivp = (struct ipvcc *)toku;
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/*
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* SVC is connected
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*/
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if ((ivp->iv_state != IPVCC_POPEN) &&
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(ivp->iv_state != IPVCC_PACCEPT)) {
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log(LOG_ERR, "ipatm: invalid CALL_CONNECTED state=%d\n",
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ivp->iv_state);
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return;
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}
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/*
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* Verify possible negotiated parameter values
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*/
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if (ivp->iv_state == IPVCC_POPEN) {
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Atm_attributes *ap = &ivp->iv_conn->co_connvc->cvc_attr;
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int mtu = (ivp->iv_flags & IVF_LLC) ?
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ATM_NIF_MTU + IPATM_LLC_LEN :
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ATM_NIF_MTU;
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/*
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* Verify final MTU
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*/
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if (ap->aal.type == ATM_AAL5) {
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if ((ap->aal.v.aal5.forward_max_SDU_size < mtu) ||
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(ap->aal.v.aal5.backward_max_SDU_size > mtu)) {
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(void) ipatm_closevc(ivp,
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T_ATM_CAUSE_AAL_PARAMETERS_NOT_SUPPORTED);
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return;
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}
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} else {
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if ((ap->aal.v.aal4.forward_max_SDU_size < mtu) ||
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(ap->aal.v.aal4.backward_max_SDU_size > mtu)) {
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(void) ipatm_closevc(ivp,
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T_ATM_CAUSE_AAL_PARAMETERS_NOT_SUPPORTED);
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return;
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}
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}
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}
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/*
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* Finish up VCC activation
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*/
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ipatm_activate(ivp);
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}
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/*
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* Process IP VCC Cleared Notification
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*
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* Arguments:
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* toku owner's connection token (ipvcc protocol block)
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* cause pointer to cause code
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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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ipatm_cleared(toku, cause)
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void *toku;
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struct t_atm_cause *cause;
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{
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struct ipvcc *ivp = (struct ipvcc *)toku;
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/*
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* VCC has been cleared, so figure out what's next
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*/
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ivp->iv_conn = NULL;
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switch (ivp->iv_state) {
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case IPVCC_POPEN:
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/*
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* Call setup failed, see if there is another
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* set of vcc parameters to try
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*/
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ivp->iv_state = IPVCC_CLOSED;
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if (ipatm_retrysvc(ivp)) {
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(void) ipatm_closevc(ivp, cause->cause_value);
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}
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break;
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case IPVCC_PACCEPT:
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case IPVCC_ACTPENT:
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case IPVCC_ACTIVE:
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ivp->iv_state = IPVCC_CLOSED;
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(void) ipatm_closevc(ivp, cause->cause_value);
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break;
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}
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}
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/*
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* Process an ARP Event Notification
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*
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* Arguments:
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* ivp pointer to IP VCC control block
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* event ARP event type
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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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ipatm_arpnotify(ivp, event)
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struct ipvcc *ivp;
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int event;
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{
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struct sockaddr_in sin;
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struct ifnet *ifp;
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/*
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* Process event
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*/
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switch (event) {
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case MAP_VALID:
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switch (ivp->iv_state) {
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case IPVCC_PMAP:
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/*
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* We've got our destination, however, first we'll
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* check to make sure no other VCC to our destination
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* has also had it's ARP table entry completed.
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* If we don't find a better VCC to use, then we'll
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* go ahead and open this SVC.
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*/
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = ivp->iv_dst.s_addr;
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if (ipatm_iptovc(&sin, ivp->iv_ipnif->inf_nif) != ivp) {
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/*
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* We found a better VCC, so use it and
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* get rid of this VCC
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*/
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if (ivp->iv_queue) {
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ifp = (struct ifnet *)
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ivp->iv_ipnif->inf_nif;
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(void) ipatm_ifoutput(ifp,
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ivp->iv_queue,
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(struct sockaddr *)&sin);
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ivp->iv_queue = NULL;
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}
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(void) ipatm_closevc(ivp,
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T_ATM_CAUSE_UNSPECIFIED_NORMAL);
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} else {
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/*
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* We like this VCC...
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*/
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ivp->iv_flags |= IVF_MAPOK;
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if (ipatm_opensvc(ivp)) {
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(void) ipatm_closevc(ivp,
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T_ATM_CAUSE_TEMPORARY_FAILURE);
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}
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}
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break;
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case IPVCC_POPEN:
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case IPVCC_PACCEPT:
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case IPVCC_ACTIVE:
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/*
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* Everything looks good, so accept new mapping
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*/
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ivp->iv_flags |= IVF_MAPOK;
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ivp->iv_dst.s_addr = ivp->iv_arpent->am_dstip.s_addr;
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/*
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* Send queued packet
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*/
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if ((ivp->iv_state == IPVCC_ACTIVE) && ivp->iv_queue) {
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = ivp->iv_dst.s_addr;
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ifp = (struct ifnet *)ivp->iv_ipnif->inf_nif;
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(void) ipatm_ifoutput(ifp, ivp->iv_queue,
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(struct sockaddr *)&sin);
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ivp->iv_queue = NULL;
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}
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break;
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}
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break;
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case MAP_INVALID:
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switch (ivp->iv_state) {
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case IPVCC_POPEN:
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case IPVCC_PACCEPT:
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case IPVCC_ACTIVE:
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/*
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* Mapping has gone stale, so we cant use this VCC
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* until the mapping is refreshed
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*/
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ivp->iv_flags &= ~IVF_MAPOK;
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break;
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}
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break;
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case MAP_FAILED:
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/*
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* ARP lookup failed, just trash it all
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*/
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(void) ipatm_closevc(ivp, T_ATM_CAUSE_TEMPORARY_FAILURE);
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break;
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case MAP_CHANGED:
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/*
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* ARP mapping has changed
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*/
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if (ivp->iv_flags & IVF_PVC) {
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/*
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* For PVCs, just reset lookup cache if needed
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*/
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if (last_map_ipvcc == ivp) {
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last_map_ipdst = 0;
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last_map_ipvcc = NULL;
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}
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} else {
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/*
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* Close SVC if it has already used this mapping
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*/
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switch (ivp->iv_state) {
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case IPVCC_POPEN:
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case IPVCC_ACTIVE:
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(void) ipatm_closevc(ivp,
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T_ATM_CAUSE_UNSPECIFIED_NORMAL);
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break;
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}
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}
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break;
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default:
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log(LOG_ERR, "ipatm: unknown arp event %d, ivp=%p\n",
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event, ivp);
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}
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}
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/*
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* Process an IP VCC idle timer tick
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*
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* This function is called every IPATM_IDLE_TIME seconds, in order to
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* scan for idle IP VCC's. If an active VCC reaches the idle time limit,
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* then it will be closed.
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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 the VCC idle 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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ipatm_itimeout(tip)
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struct atm_time *tip;
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{
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struct ipvcc *ivp, *inext;
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struct ip_nif *inp;
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/*
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* Schedule next timeout
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*/
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atm_timeout(&ipatm_itimer, IPATM_IDLE_TIME, ipatm_itimeout);
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/*
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* Check for disabled idle timeout
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*/
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if (ipatm_vcidle == 0)
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return;
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/*
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* Check out all IP VCCs
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*/
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for (inp = ipatm_nif_head; inp; inp = inp->inf_next) {
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for (ivp = Q_HEAD(inp->inf_vcq, struct ipvcc); ivp;
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ivp = inext) {
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inext = Q_NEXT(ivp, struct ipvcc, iv_elem);
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/*
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* Looking for active, idle SVCs
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*/
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if (ivp->iv_flags & (IVF_PVC | IVF_NOIDLE))
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continue;
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if (ivp->iv_state != IPVCC_ACTIVE)
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continue;
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if (++ivp->iv_idle < ipatm_vcidle)
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continue;
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/*
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* OK, we found one - close the VCC
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*/
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(void) ipatm_closevc(ivp,
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T_ATM_CAUSE_UNSPECIFIED_NORMAL);
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}
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}
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}
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