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1820df7a2d
Host ATM Research Platform (HARP), Network Computing Services, Inc. This software was developed with the support of the Defense Advanced Research Projects Agency (DARPA).
495 lines
10 KiB
C
495 lines
10 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: spans_subr.c,v 1.9 1998/08/26 23:29:10 mks Exp $
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*
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*/
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/*
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* SPANS Signalling Manager
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* ---------------------------
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*
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* SPANS-related subroutines.
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*
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*/
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#ifndef lint
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static char *RCSid = "@(#) $Id: spans_subr.c,v 1.9 1998/08/26 23:29:10 mks Exp $";
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#endif
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#include <netatm/kern_include.h>
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#include "spans_xdr.h"
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#include <netatm/spans/spans_var.h>
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/*
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* Open a SPANS VCC
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*
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* Called when a user wants to open a VC. This function will construct
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* a VCCB, create the stack requested by the user, and, if we are
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* opening an SVC, start the SPANS signalling message exchange. The
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* user will have to wait for a notify event to be sure the SVC is fully
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* open.
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*
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* Must be called at splnet.
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*
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* Arguments:
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* spp pointer to SPANS protocol instance
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* acp pointer to PVC's connection parameters
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*
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* Returns:
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* 0 VCC creation successful
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* errno VCC setup failed - reason indicated
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*
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*/
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int
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spans_open_vcc(spp, cvp)
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struct spans *spp;
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Atm_connvc *cvp;
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{
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struct atm_pif *pip = spp->sp_pif;
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struct spans_vccb *svp;
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Atm_addr_pvc *pvp;
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spans_aal aal;
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int err, pvc, vpi, vci;
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ATM_DEBUG2("spans_open_vcc: spp=0x%x, cvp=0x%x\n", spp, cvp);
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/*
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* Validate user parameters. AAL and encapsulation are
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* checked by the connection manager.
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*/
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/*
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* Check called party address(es)
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*/
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if (cvp->cvc_attr.called.tag != T_ATM_PRESENT ||
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cvp->cvc_attr.called.addr.address_format ==
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T_ATM_ABSENT ||
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cvp->cvc_attr.called.subaddr.address_format !=
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T_ATM_ABSENT) {
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return(EINVAL);
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}
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switch (cvp->cvc_attr.called.addr.address_format) {
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case T_ATM_PVC_ADDR:
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/*
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* Make sure VPI/VCI is valid
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*/
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pvc = 1;
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pvp = (Atm_addr_pvc *)cvp->cvc_attr.called.addr.address;
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vpi = ATM_PVC_GET_VPI(pvp);
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vci = ATM_PVC_GET_VCI(pvp);
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if ((vpi > pip->pif_maxvpi) ||
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(vci == 0) ||
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(vci > pip->pif_maxvci)) {
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return(ERANGE);
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}
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/*
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* Make sure VPI/VCI is not already in use
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*/
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if (spans_find_vpvc(spp, vpi, vci, 0)) {
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return(EADDRINUSE);
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}
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ATM_DEBUG2("spans_open_vcc: VPI.VCI=%d.%d\n",
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vpi, vci);
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break;
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case T_ATM_SPANS_ADDR:
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pvc = 0;
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vpi = vci = 0;
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/*
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* Check signalling state
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*/
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if (spp->sp_state != SPANS_ACTIVE) {
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return(ENETDOWN);
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}
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/*
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*Check destination address length
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*/
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if (cvp->cvc_attr.called.addr.address_length !=
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sizeof(spans_addr)) {
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return(EINVAL);
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}
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break;
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default:
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return(EINVAL);
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}
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/*
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* Check that this is for the same interface SPANS uses
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*/
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if (!cvp->cvc_attr.nif ||
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cvp->cvc_attr.nif->nif_pif != spp->sp_pif) {
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return(EINVAL);
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}
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/*
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* Check AAL
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*/
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if (!spans_get_spans_aal(cvp->cvc_attr.aal.type, &aal)) {
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return(EINVAL);
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}
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#ifdef NOTDEF
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/*
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* Check encapsulation
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*/
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/* XXX -- How do we check encapsulation? */
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if (cvp->ac_encaps != ATM_ENC_NULL) {
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return(EINVAL);
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}
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#endif
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/*
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* Allocate control block for VCC
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*/
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svp = (struct spans_vccb *)atm_allocate(&spans_vcpool);
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if (svp == NULL) {
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return(ENOMEM);
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}
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/*
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* Fill in VCCB
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*/
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if (pvc) {
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svp->sv_type = VCC_PVC | VCC_IN | VCC_OUT;
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svp->sv_vpi = vpi;
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svp->sv_vci = vci;
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svp->sv_sstate = (spp->sp_state == SPANS_ACTIVE ?
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SPANS_VC_ACTIVE : SPANS_VC_ACT_DOWN);
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svp->sv_ustate = VCCU_OPEN;
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} else {
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svp->sv_type = VCC_SVC | VCC_OUT;
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spans_addr_copy(cvp->cvc_attr.called.addr.address,
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&svp->sv_conn.con_dst);
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spans_addr_copy(spp->sp_addr.address,
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&svp->sv_conn.con_src);
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svp->sv_conn.con_dsap = SPANS_SAP_IP;
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svp->sv_conn.con_ssap = spans_ephemeral_sap(spp);
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svp->sv_sstate = SPANS_VC_POPEN;
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svp->sv_ustate = VCCU_POPEN;
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}
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svp->sv_proto = ATM_SIG_SPANS;
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svp->sv_pif = spp->sp_pif;
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svp->sv_nif = cvp->cvc_attr.nif;
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svp->sv_connvc = cvp;
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svp->sv_spans_aal = aal;
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svp->sv_tstamp = time_second;
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/*
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* Put VCCB on SPANS queue
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*/
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ENQUEUE(svp, struct spans_vccb, sv_sigelem, spp->sp_vccq);
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/*
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* Link VCCB to VCC connection block
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*/
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cvp->cvc_vcc = (struct vccb *) svp;
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/*
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* Start the SPANS message exchange if this is an SVC
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*/
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if (!pvc) {
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svp->sv_retry = 0;
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svp->sv_spans_qos.rsc_peak = 1;
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svp->sv_spans_qos.rsc_mean = 1;
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svp->sv_spans_qos.rsc_burst = 1;
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err = spans_send_open_req(spp, svp);
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if (err) {
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/*
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* On error, delete the VCCB
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*/
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DEQUEUE(svp, struct spans_vccb, sv_sigelem,
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spp->sp_vccq);
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cvp->cvc_vcc = (struct vccb *)0;
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atm_free((caddr_t)svp);
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return(err);
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} else {
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/*
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* VCCB is opening--set the retransmit timer
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*/
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SPANS_VC_TIMER((struct vccb *) svp, SV_TIMEOUT);
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}
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}
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return(0);
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}
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/*
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* Close a SPANS VCC
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*
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* Called when a user wants to close a VCC. This function will clean
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* up the VCCB and, for an SVC, send a close request.
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*
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* Must be called at splnet.
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*
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* Arguments:
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* spp pointer to SPANS protocol instance
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* svp pointer to VCCB for the VCC to be closed
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*
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* Returns:
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* 0 VCC is now closed
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* errno error encountered
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*/
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int
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spans_close_vcc(spp, svp, force)
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struct spans *spp;
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struct spans_vccb *svp;
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int force;
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{
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int err = 0;
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ATM_DEBUG2("spans_close_vcc: svp=0x%x, state=%d\n", svp,
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svp->sv_sstate);
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/*
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* Check that this is for the same interface SPANS uses
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*/
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if (svp->sv_pif != spp->sp_pif) {
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return (EINVAL);
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}
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/*
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* Kill any possible timer
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*/
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SPANS_VC_CANCEL((struct vccb *) svp);
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/*
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* Mark the close time.
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*/
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svp->sv_tstamp = time_second;
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/*
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* Process based on the connection type
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*/
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if (svp->sv_type & VCC_PVC) {
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svp->sv_sstate = SPANS_VC_FREE;
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svp->sv_ustate = VCCU_CLOSED;
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} else if (svp->sv_type & VCC_SVC) {
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/*
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* Update VCCB states
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*/
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svp->sv_ustate = VCCU_CLOSED;
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/*
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* Send the appropriate SPANS close message
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*/
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switch (svp->sv_sstate) {
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case SPANS_VC_R_POPEN:
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err = spans_send_open_rsp(spp, svp, SPANS_FAIL);
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svp->sv_sstate = SPANS_VC_FREE;
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break;
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case SPANS_VC_OPEN:
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case SPANS_VC_POPEN:
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case SPANS_VC_ABORT:
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svp->sv_retry = 0;
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err = spans_send_close_req(spp, svp);
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if (force) {
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svp->sv_sstate = SPANS_VC_FREE;
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} else {
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svp->sv_sstate = SPANS_VC_CLOSE;
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SPANS_VC_TIMER((struct vccb *) svp,
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SV_TIMEOUT);
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}
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break;
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case SPANS_VC_CLOSE:
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if (force) {
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svp->sv_sstate = SPANS_VC_FREE;
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}
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break;
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}
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}
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/*
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* Wait for user to free resources
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*/
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return(err);
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}
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/*
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* Clear a SPANS VCC
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*
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* Called when the signalling manager wants to close a VCC immediately.
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* This function will clean up the VCCB and notify the owner.
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*
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* Must be called at splnet.
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*
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* Arguments:
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* spp pointer to SPANS protocol instance
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* svp pointer to VCCB for the VCC to be closed
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*
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* Returns:
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* 0 VCC is now closed
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* errno error encountered
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*/
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int
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spans_clear_vcc(spp, svp)
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struct spans *spp;
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struct spans_vccb *svp;
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{
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u_char outstate;
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ATM_DEBUG2("spans_clear_vcc: svp=0x%x, state=%d\n", svp,
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svp->sv_sstate);
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/*
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* Check that this is for the same interface SPANS uses
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*/
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if (svp->sv_pif != spp->sp_pif) {
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return (EINVAL);
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}
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/*
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* Kill any possible timer
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*/
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SPANS_VC_CANCEL((struct vccb *) svp);
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/*
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* Mark the close time
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*/
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svp->sv_tstamp = time_second;
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/*
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* Mark the VCCB closed
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*/
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outstate = svp->sv_sstate;
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svp->sv_sstate = SPANS_VC_FREE;
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svp->sv_ustate = VCCU_CLOSED;
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/*
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* Notify the user if old state indicates.
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*/
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switch (outstate) {
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case SPANS_VC_ACTIVE:
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case SPANS_VC_ACT_DOWN:
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case SPANS_VC_POPEN:
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case SPANS_VC_OPEN:
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case SPANS_VC_CLOSE:
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case SPANS_VC_ABORT:
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/* XXX -- set cause */
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atm_cm_cleared(svp->sv_connvc);
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break;
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case SPANS_VC_NULL:
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case SPANS_VC_R_POPEN:
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case SPANS_VC_FREE:
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break;
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}
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/*
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* Wait for user to free resources
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*/
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return(0);
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}
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/*
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* Reset the switch state
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*
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* Called when the switch or host at the far end of the ATM link has
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* gone away. This can be deteched either by a number of SPANS_STAT_REQ
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* messages going unanswered or by the host epoch changing in a SPANS
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* SPANS_STAT_IND or SPANS_STAT_REQ message.
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*
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* Arguments:
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* spp pointer to SPANS protocol instance
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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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spans_switch_reset(spp, cause)
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struct spans *spp;
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int cause;
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{
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int s;
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struct vccb *vcp, *vnext;
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ATM_DEBUG2("spans_switch_reset: spp=0x%x, cause=%d\n",
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spp, cause);
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/*
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* Log the event
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*/
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log(LOG_INFO, "spans: signalling %s on interface %s%d\n",
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(cause == SPANS_UNI_DOWN ? "down" : "up"),
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spp->sp_pif->pif_name,
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spp->sp_pif->pif_unit);
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/*
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* Terminate all of our VCCs
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*/
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s = splnet();
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for (vcp = Q_HEAD(spp->sp_vccq, struct vccb); vcp;
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vcp = vnext) {
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u_char outstate;
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vnext = Q_NEXT(vcp, struct vccb, vc_sigelem);
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if (vcp->vc_type & VCC_SVC) {
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/*
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* Close the SVC and notify the owner
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*/
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outstate = vcp->vc_sstate;
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SPANS_VC_CANCEL((struct vccb *) vcp);
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vcp->vc_ustate = VCCU_CLOSED;
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vcp->vc_sstate = SPANS_VC_FREE;
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if (outstate == SPANS_VC_OPEN ||
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outstate == SPANS_VC_POPEN) {
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/* XXX -- set cause */
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atm_cm_cleared(vcp->vc_connvc);
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}
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} else if (vcp->vc_type & VCC_PVC) {
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/*
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* Note new state
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*/
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switch(cause) {
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case SPANS_UNI_DOWN:
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vcp->vc_sstate = SPANS_VC_ACT_DOWN;
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break;
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case SPANS_UNI_UP:
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vcp->vc_sstate = SPANS_VC_ACTIVE;
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break;
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}
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} else {
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log(LOG_ERR, "spans: invalid VCC type: vccb=0x%x, type=%d\n",
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vcp, vcp->vc_type);
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}
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}
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(void) splx(s);
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}
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