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).
513 lines
11 KiB
C
513 lines
11 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: atm_signal.c,v 1.8 1998/03/24 20:45:37 mks Exp $
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*
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*/
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/*
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* Core ATM Services
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* -----------------
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*
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* General ATM signalling management
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*
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*/
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#ifndef lint
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static char *RCSid = "@(#) $Id: atm_signal.c,v 1.8 1998/03/24 20:45:37 mks Exp $";
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#endif
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#include <netatm/kern_include.h>
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/*
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* Local variables
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*/
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static struct sigmgr *atm_sigmgr_head = NULL;
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static struct stack_defn *atm_stack_head = NULL;
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/*
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* Register a new Signalling Manager
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*
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* Each Signalling Manager must register itself here upon completing
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* its internal initialization. This applies to both linked and loaded
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* managers.
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*
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* Arguments:
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* smp pointer to Signalling Manager description
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*
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* Returns:
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* 0 registration was successful
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* errno registration failed - reason indicated
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*
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*/
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int
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atm_sigmgr_register(smp)
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struct sigmgr *smp;
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{
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struct sigmgr *smp2;
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int s = splnet();
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/*
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* See if we need to be initialized
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*/
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if (!atm_init)
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atm_initialize();
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/*
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* Make sure there's only one instance of each protocol
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*/
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for (smp2 = atm_sigmgr_head; smp2 != NULL; smp2 = smp2->sm_next) {
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if (smp->sm_proto == smp2->sm_proto) {
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(void) splx(s);
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return (EEXIST);
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}
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}
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/*
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* Looks okay, link it in
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*/
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LINK2TAIL(smp, struct sigmgr, atm_sigmgr_head, sm_next);
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(void) splx(s);
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return (0);
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}
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/*
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* De-register a Signalling Manager
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*
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* Each Signalling Manager must de-register (is this really a word?)
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* itself before removing itself from the system. This really only
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* applies to managers about to be modunload'ed. It is the signal
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* manager's responsibility to ensure that all its protocol instances
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* have been successfully terminated before de-registering itself.
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*
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* Arguments:
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* smp pointer to Signalling Manager description
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*
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* Returns:
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* 0 deregistration was successful
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* errno deregistration failed - reason indicated
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*
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*/
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int
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atm_sigmgr_deregister(smp)
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struct sigmgr *smp;
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{
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int found, s = splnet();
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/*
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* Unlink descriptor
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*/
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UNLINKF(smp, struct sigmgr, atm_sigmgr_head, sm_next, found);
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(void) splx(s);
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if (!found)
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return (ENOENT);
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return (0);
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}
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/*
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* Attach a Signalling Manager to an ATM physical interface
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*
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* Each ATM physical interface must have a signalling manager attached to
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* itself for the signalling protocol to be run across this interface. The
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* interface must be registered and completely initialized before the attach,
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* since the signalling manager may initiate virtual circuit activity as part
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* its response to this call.
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*
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* Called at splnet.
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*
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* Arguments:
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* pip pointer to atm physical interface control block
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* proto requested signalling protocol
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*
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* Returns:
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* 0 attach successful
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* errno attach failed - reason indicated
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*
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*/
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int
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atm_sigmgr_attach(pip, proto)
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struct atm_pif *pip;
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u_char proto;
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{
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struct atm_pif *tp;
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struct sigmgr *smp;
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int err;
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/*
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* Make sure interface is registered
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*/
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for (tp = atm_interface_head; tp != NULL; tp = tp->pif_next) {
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if (tp == pip)
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break;
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}
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if (tp == NULL) {
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return (ENOENT);
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}
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/*
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* Make sure no signalling manager is already attached
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*/
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if (pip->pif_sigmgr != NULL) {
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return (EEXIST);
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}
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/*
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* Must have at least one network interface defined
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*/
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if (pip->pif_nif == NULL)
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return (ETOOMANYREFS);
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/*
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* Find requested protocol
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*/
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for (smp = atm_sigmgr_head; smp != NULL; smp = smp->sm_next) {
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if (smp->sm_proto == proto)
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break;
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}
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if (smp == NULL) {
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return (EPROTONOSUPPORT);
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}
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/*
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* Tell the signal manager about it
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*/
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err = (*smp->sm_attach)(smp, pip);
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/*
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* Tell all registered convergence modules about this
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*/
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if (!err) {
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struct atm_nif *nip;
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struct atm_ncm *ncp;
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for (nip = pip->pif_nif; nip; nip = nip->nif_pnext) {
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for (ncp = atm_netconv_head; ncp; ncp = ncp->ncm_next) {
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if (err = (*ncp->ncm_stat)
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(NCM_SIGATTACH, nip, 0))
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break;
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}
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if (err)
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break;
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}
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if (err) {
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/*
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* Someone's unhappy, so back all this out
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*/
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(void) atm_sigmgr_detach(pip);
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}
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}
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return (err);
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}
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/*
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* Detach an ATM physical interface from a Signalling Manager
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*
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* The ATM interface must be detached from the signalling manager
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* before the interface can be de-registered.
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*
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* Called at splnet.
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*
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* Arguments:
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* pip pointer to atm physical interface control block
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*
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* Returns:
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* 0 detach successful
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* errno detach failed - reason indicated
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*
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*/
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int
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atm_sigmgr_detach(pip)
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struct atm_pif *pip;
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{
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struct atm_pif *tp;
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struct atm_nif *nip;
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struct atm_ncm *ncp;
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int err;
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/*
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* Make sure interface is registered
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*/
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for (tp = atm_interface_head; tp != NULL; tp = tp->pif_next) {
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if (tp == pip)
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break;
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}
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if (tp == NULL) {
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return (ENOENT);
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}
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/*
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* Make sure a signalling manager is attached
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*/
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if (pip->pif_sigmgr == NULL) {
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return (ENOENT);
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}
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/*
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* Tell all registered convergence modules about this
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*/
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for (nip = pip->pif_nif; nip; nip = nip->nif_pnext) {
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for (ncp = atm_netconv_head; ncp; ncp = ncp->ncm_next) {
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(void) (*ncp->ncm_stat)(NCM_SIGDETACH, nip, 0);
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}
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}
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/*
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* Tell the signal manager about it
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*
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* NOTE:
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* The only reason this should ever fail is if things are really
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* hosed up somewhere, in which case doing a bunch of NCM_SIGATTACH's
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* here just doesn't seem to help much.
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*/
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err = (*pip->pif_sigmgr->sm_detach)(pip);
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return (err);
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}
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/*
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* Register an ATM Stack Service
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*
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* Each ATM stack service provider must register its provided service(s) here.
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* Each service must be registered separately. Service providers include
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* both loaded and linked kernel modules. Device driver services are NOT
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* registered here - their service registry is performed implicitly through
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* the device interface structure stack services list (pif_services).
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*
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* Arguments:
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* sdp pointer to stack service definition block
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*
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* Returns:
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* 0 registration successful
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* errno registration failed - reason indicated
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*
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*/
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int
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atm_stack_register(sdp)
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struct stack_defn *sdp;
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{
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struct stack_defn *tdp;
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int s = splnet();
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/*
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* See if we need to be initialized
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*/
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if (!atm_init)
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atm_initialize();
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/*
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* Ensure no duplicates
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*/
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for (tdp = atm_stack_head; tdp != NULL; tdp = tdp->sd_next) {
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if (tdp->sd_sap == sdp->sd_sap)
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break;
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}
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if (tdp != NULL) {
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(void) splx(s);
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return (EEXIST);
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}
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/*
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* Add stack to list
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*/
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LINK2TAIL(sdp, struct stack_defn, atm_stack_head, sd_next);
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(void) splx(s);
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return (0);
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}
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/*
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* De-register an ATM Stack Service
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*
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* Each ATM stack service provider must de-register its registered service(s)
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* before terminating the service. Specifically, loaded kernel modules
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* must de-register their services before unloading themselves.
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*
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* Arguments:
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* sdp pointer to stack service definition block
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*
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* Returns:
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* 0 de-registration successful
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* errno de-registration failed - reason indicated
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*
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*/
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int
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atm_stack_deregister(sdp)
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struct stack_defn *sdp;
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{
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int found, s = splnet();
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/*
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* Remove service from list
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*/
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UNLINKF(sdp, struct stack_defn, atm_stack_head, sd_next, found);
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(void) splx(s);
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if (!found)
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return (ENOENT);
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return (0);
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}
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/*
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* Create and Instantiate a Stack
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*
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* For the requested stack list, locate the stack service definitions
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* necessary to build the stack to implement the listed services.
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* The stack service definitions provided by the interface device-driver
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* are always preferred, since they are (hopefully) done with
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* hardware assistance from the interface card.
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*
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* After the stack has been built, the selected services are called to
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* notify them of the new stack instantiation. Each service should then
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* allocate all the resources it requires for this new stack instance.
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* The service should then wait for subsequent protocol notification
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* via its stack command handlers.
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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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* cvp pointer to connection vcc block for the created stack
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* tlp pointer to stack list
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* upf top-of-stack CM upper command handler
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*
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* Returns:
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* 0 stack successfully created
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* errno failed - reason indicated
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*
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*/
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int
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atm_create_stack(cvp, tlp, upf)
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Atm_connvc *cvp;
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struct stack_list *tlp;
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void (*upf)__P((int, void *, int, int));
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{
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struct stack_defn *sdp, usd;
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struct stack_inst svs;
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struct atm_pif *pip = cvp->cvc_attr.nif->nif_pif;
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int i, err;
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/*
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* Initialize stack (element 0 is for owner's services)
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*/
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svs.si_srvc[1] = sdp = NULL;
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/*
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* Locate service provider for each service in the
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* stack list. We prefer interface driver providers
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* over kernel module providers.
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*/
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for (i = 0; i < STACK_CNT; i++) {
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Sap_t sap;
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/* Stack list is 0-terminated */
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if ((sap = tlp->sl_sap[i]) == 0)
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break;
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/*
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* Search interface's services
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*/
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for (sdp = pip->pif_services; sdp; sdp = sdp->sd_next)
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if (sdp->sd_sap == sap)
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break;
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if (sdp == NULL) {
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/*
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* Search kernel services
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*/
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for (sdp = atm_stack_head; sdp;
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sdp = sdp->sd_next)
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if (sdp->sd_sap == sap)
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break;
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}
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if (sdp == NULL) {
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/*
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* Requested service id not found
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*/
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return (ENOENT);
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}
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/*
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* Save stack definition for this service
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*/
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svs.si_srvc[i+1] = sdp;
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/*
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* Quit loop if this service is terminal, ie. if
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* it takes care of the rest of the stack.
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*/
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if (sdp->sd_flag & SDF_TERM)
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break;
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}
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/*
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* Ensure stack instance array is located and terminated
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*/
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if ((svs.si_srvc[1] == NULL) || !(sdp->sd_flag & SDF_TERM)) {
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return (ENOENT);
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}
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/*
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* Setup owner service definition
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*/
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KM_ZERO((caddr_t)&usd, sizeof(struct stack_defn));
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usd.sd_upper = upf;
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usd.sd_toku = cvp;
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svs.si_srvc[0] = &usd;
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/*
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* Instantiate the stack
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*/
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err = (*svs.si_srvc[1]->sd_inst)(&svs.si_srvc[0], cvp);
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if (err) {
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return (err);
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}
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/*
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* Save top 'o stack info
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*/
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cvp->cvc_lower = svs.si_srvc[1]->sd_lower;
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cvp->cvc_tokl = svs.si_srvc[1]->sd_toku;
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return (0);
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}
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