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freebsd-dev/sys/netatm/atm_cm.c
rwatson a584d6bac9 In the current world order, solisten() implements the state transition of 
a socket from a regular socket to a listening socket able to accept new
connections.  As part of this state transition, solisten() calls into the
protocol to update protocol-layer state.  There were several bugs in this
implementation that could result in a race wherein a TCP SYN received
in the interval between the protocol state transition and the shortly
following socket layer transition would result in a panic in the TCP code,
as the socket would be in the TCPS_LISTEN state, but the socket would not
have the SO_ACCEPTCONN flag set.

This change does the following:

- Pushes the socket state transition from the socket layer solisten() to
  to socket "library" routines called from the protocol.  This permits
  the socket routines to be called while holding the protocol mutexes,
  preventing a race exposing the incomplete socket state transition to TCP
  after the TCP state transition has completed.  The check for a socket
  layer state transition is performed by solisten_proto_check(), and the
  actual transition is performed by solisten_proto().

- Holds the socket lock for the duration of the socket state test and set,
  and over the protocol layer state transition, which is now possible as
  the socket lock is acquired by the protocol layer, rather than vice
  versa.  This prevents additional state related races in the socket
  layer.

This permits the dual transition of socket layer and protocol layer state
to occur while holding locks for both layers, making the two changes
atomic with respect to one another.  Similar changes are likely require
elsewhere in the socket/protocol code.

Reported by:		Peter Holm <peter@holm.cc>
Review and fixes from:	emax, Antoine Brodin <antoine.brodin@laposte.net>
Philosophical head nod:	gnn
2005-02-21 21:58:17 +00:00

3502 lines
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/*-
* ===================================
* HARP | Host ATM Research Platform
* ===================================
*
*
* This Host ATM Research Platform ("HARP") file (the "Software") is
* made available by Network Computing Services, Inc. ("NetworkCS")
* "AS IS". NetworkCS does not provide maintenance, improvements or
* support of any kind.
*
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
* In no event shall NetworkCS be responsible for any damages, including
* but not limited to consequential damages, arising from or relating to
* any use of the Software or related support.
*
* Copyright 1994-1998 Network Computing Services, Inc.
*
* Copies of this Software may be made, however, the above copyright
* notice must be reproduced on all copies.
*/
/*
* Core ATM Services
* -----------------
*
* ATM Connection Manager
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/bpf.h>
#include <netatm/port.h>
#include <netatm/queue.h>
#include <netatm/atm.h>
#include <netatm/atm_sys.h>
#include <netatm/atm_sap.h>
#include <netatm/atm_cm.h>
#include <netatm/atm_if.h>
#include <netatm/atm_vc.h>
#include <netatm/atm_sigmgr.h>
#include <netatm/atm_stack.h>
#include <netatm/atm_pcb.h>
#include <netatm/atm_var.h>
/*
* Global variables
*/
struct atm_cm_stat atm_cm_stat = {0};
/*
* Local functions
*/
static void atm_cm_cpcs_upper(int, void *, intptr_t, intptr_t);
static void atm_cm_saal_upper(int, void *, intptr_t, intptr_t);
static void atm_cm_sscop_upper(int, void *, intptr_t, intptr_t);
static Atm_connvc * atm_cm_share_llc(Atm_attributes *);
static void atm_cm_closeconn(Atm_connection *,
struct t_atm_cause *);
static void atm_cm_closevc(Atm_connvc *);
static void atm_cm_timeout(struct atm_time *);
static KTimeout_ret atm_cm_procinq(void *);
static void atm_cm_incall(Atm_connvc *);
static int atm_cm_accept(Atm_connvc *, Atm_connection *);
/*
* Local variables
*/
static Queue_t atm_connection_queue = {NULL};
static Queue_t atm_incoming_queue = {NULL};
static int atm_incoming_qlen = 0;
static Atm_connection *atm_listen_queue = NULL;
static struct attr_cause atm_cause_tmpl =
{T_ATM_PRESENT, {T_ATM_ITU_CODING, T_ATM_LOC_USER, 0, {0, 0, 0, 0}}};
/*
* Stack commands, indexed by API
*/
static struct {
int init;
int term;
} atm_stackcmds[] = {
{CPCS_INIT, CPCS_TERM}, /* CMAPI_CPCS */
{SSCF_UNI_INIT, SSCF_UNI_TERM}, /* CMAPI_SAAL */
{SSCOP_INIT, SSCOP_TERM}, /* CMAPI_SSCOP */
};
static uma_zone_t atm_connection_zone;
static uma_zone_t atm_connvc_zone;
void
atm_cm_init(void)
{
atm_connection_zone = uma_zcreate("atm connection",
sizeof(Atm_connection), NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
if (atm_connection_zone == NULL)
panic("atm_connection_zone");
atm_connvc_zone = uma_zcreate("atm connvc", sizeof(Atm_connvc), NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
if (atm_connvc_zone == NULL)
panic("atm_connvc_zone");
}
/*
* Initiate Outgoing ATM Call
*
* Called by an endpoint service to create a new Connection Manager API
* instance and to initiate an outbound ATM connection. The endpoint
* provided token will be used in all further CM -> endpoint function
* calls, and the returned connection block pointer must be used in all
* subsequent endpoint -> CM function calls.
*
* If the return indicates that the connection setup has been immediately
* successful (typically only for PVCs and shared SVCs), then the connection
* is ready for data transmission.
*
* If the return indicates that the connection setup is still in progress,
* then the endpoint must wait for notification from the Connection Manager
* indicating the final status of the call setup. If the call setup completes
* successfully, then a "call connected" notification will be sent to the
* endpoint by the Connection Manager. If the call setup fails, then the
* endpoint will receive a "call cleared" notification.
*
* All connection instances must be freed with an atm_cm_release() call.
*
* Arguments:
* epp pointer to endpoint definition structure
* token endpoint's connection instance token
* ap pointer to requested connection attributes
* copp pointer to location to return allocated connection block
*
* Returns:
* 0 connection has been successfully established
* EINPROGRESS connection establishment is in progress
* errno connection failed - reason indicated
*
*/
int
atm_cm_connect(epp, token, ap, copp)
Atm_endpoint *epp;
void *token;
Atm_attributes *ap;
Atm_connection **copp;
{
Atm_connection *cop;
Atm_connvc *cvp;
struct atm_pif *pip;
struct sigmgr *smp;
struct stack_list sl;
void (*upf)(int, void *, intptr_t, intptr_t);
int s, sli, err, err2;
*copp = NULL;
cvp = NULL;
/*
* Get a connection block
* May be called from timeout - don't wait.
*/
cop = uma_zalloc(atm_connection_zone, M_NOWAIT);
if (cop == NULL)
return (ENOMEM);
/*
* Initialize connection info
*/
cop->co_endpt = epp;
cop->co_toku = token;
/*
* Initialize stack list index
*/
sli = 0;
/*
* Validate and extract useful attribute information
*/
/*
* Must specify a network interface (validated below)
*/
if (ap->nif == NULL) {
err = EINVAL;
goto done;
}
/*
* Check out Data API
*/
switch (ap->api) {
case CMAPI_CPCS:
upf = atm_cm_cpcs_upper;
break;
case CMAPI_SAAL:
sl.sl_sap[sli++] = SAP_SSCF_UNI;
sl.sl_sap[sli++] = SAP_SSCOP;
upf = atm_cm_saal_upper;
break;
case CMAPI_SSCOP:
sl.sl_sap[sli++] = SAP_SSCOP;
upf = atm_cm_sscop_upper;
break;
default:
err = EINVAL;
goto done;
}
/*
* AAL Attributes
*/
if (ap->aal.tag != T_ATM_PRESENT) {
err = EINVAL;
goto done;
}
switch (ap->aal.type) {
case ATM_AAL5:
sl.sl_sap[sli++] = SAP_CPCS_AAL5;
sl.sl_sap[sli++] = SAP_SAR_AAL5;
sl.sl_sap[sli++] = SAP_ATM;
break;
case ATM_AAL3_4:
sl.sl_sap[sli++] = SAP_CPCS_AAL3_4;
sl.sl_sap[sli++] = SAP_SAR_AAL3_4;
sl.sl_sap[sli++] = SAP_ATM;
break;
default:
err = EINVAL;
goto done;
}
/*
* Broadband Bearer Attributes
*/
if (ap->bearer.tag != T_ATM_PRESENT) {
err = EINVAL;
goto done;
}
switch (ap->bearer.v.connection_configuration) {
case T_ATM_1_TO_1:
cop->co_flags |= COF_P2P;
break;
case T_ATM_1_TO_MANY:
/* Not supported */
cop->co_flags |= COF_P2MP;
err = EINVAL;
goto done;
default:
err = EINVAL;
goto done;
}
/*
* Logical Link Control Attributes
*/
if (ap->llc.tag == T_ATM_PRESENT) {
if ((ap->blli.tag_l2 != T_ATM_PRESENT) ||
(ap->blli.v.layer_2_protocol.ID_type != T_ATM_SIMPLE_ID) ||
(ap->blli.v.layer_2_protocol.ID.simple_ID !=
T_ATM_BLLI2_I8802) ||
(ap->llc.v.llc_len < T_ATM_LLC_MIN_LEN) ||
(ap->llc.v.llc_len > T_ATM_LLC_MAX_LEN)) {
err = EINVAL;
goto done;
}
cop->co_mpx = ATM_ENC_LLC;
cop->co_llc = ap->llc;
} else
cop->co_mpx = ATM_ENC_NULL;
/*
* Called Party Attributes
*/
if (ap->called.tag != T_ATM_PRESENT) {
err = EINVAL;
goto done;
}
if ((ap->called.addr.address_format == T_ATM_ABSENT) ||
(ap->called.addr.address_length == 0)) {
err = EINVAL;
goto done;
}
/*
* Calling Party Attributes
*/
if (ap->calling.tag != T_ATM_ABSENT) {
err = EINVAL;
goto done;
}
/*
* Quality of Service Attributes
*/
if (ap->qos.tag != T_ATM_PRESENT) {
err = EINVAL;
goto done;
}
/*
* Terminate stack list
*/
sl.sl_sap[sli] = 0;
s = splnet();
/*
* Let multiplexors decide whether we need a new VCC
*/
switch (cop->co_mpx) {
case ATM_ENC_NULL:
/*
* All of these connections require a new VCC
*/
break;
case ATM_ENC_LLC:
/*
* See if we can share an existing LLC connection
*/
cvp = atm_cm_share_llc(ap);
if (cvp == NULL)
break;
/*
* We've got a connection to share
*/
cop->co_connvc = cvp;
if (cvp->cvc_state == CVCS_ACTIVE) {
cop->co_state = COS_ACTIVE;
err = 0;
} else {
cop->co_state = COS_OUTCONN;
err = EINPROGRESS;
}
LINK2TAIL(cop, Atm_connection, cvp->cvc_conn->co_mxh, co_next);
cop->co_mxh = cvp->cvc_conn->co_mxh;
*copp = cop;
(void) splx(s);
return (err);
default:
panic("atm_cm_connect: unknown mpx");
}
/*
* If we get here, it means we need to create
* a new VCC for this connection
*/
/*
* Validate that network interface is registered and that
* a signalling manager is attached
*/
for (pip = atm_interface_head; pip != NULL; pip = pip->pif_next) {
struct atm_nif *nip;
for (nip = pip->pif_nif; nip; nip = nip->nif_pnext) {
if (nip == ap->nif)
break;
}
if (nip)
break;
}
if (pip == NULL) {
err = ENXIO;
goto donex;
}
if ((smp = pip->pif_sigmgr) == NULL) {
err = ENXIO;
goto donex;
}
/*
* Get a connection VCC block
* May be called from timeouts - don't wait.
*/
cvp = uma_zalloc(atm_connvc_zone, M_NOWAIT);
if (cvp == NULL) {
err = ENOMEM;
goto donex;
}
/*
* Save VCC attributes
*/
cvp->cvc_attr = *ap;
cvp->cvc_flags |= CVCF_CALLER;
/*
* Link the control blocks
*/
cop->co_connvc = cvp;
cvp->cvc_conn = cop;
cvp->cvc_sigmgr = smp;
/*
* Create a service stack
*/
err = atm_create_stack(cvp, &sl, upf);
if (err) {
cvp->cvc_state = CVCS_CLEAR;
atm_cm_closevc(cvp);
goto donex;
}
/*
* Let the signalling manager handle the VCC creation
*/
cvp->cvc_state = CVCS_SETUP;
switch ((*smp->sm_setup)(cvp, &err)) {
case CALL_CONNECTED:
/*
* Connection is fully setup - initialize the stack
*/
cvp->cvc_state = CVCS_INIT;
STACK_CALL(atm_stackcmds[ap->api].init, cvp->cvc_lower,
cvp->cvc_tokl, cvp, ap->api_init, 0, err2);
if (err2)
panic("atm_cm_connect: init");
if (cvp->cvc_flags & CVCF_ABORTING) {
/*
* Someone on the stack bailed out...schedule the
* VCC and stack termination
*/
atm_cm_closevc(cvp);
err = EFAULT;
} else {
/*
* Everything looks fine from here
*/
cvp->cvc_state = CVCS_ACTIVE;
cop->co_state = COS_ACTIVE;
}
break;
case CALL_FAILED:
/*
* Terminate stack and clean up before we leave
*/
cvp->cvc_state = CVCS_CLEAR;
atm_cm_closevc(cvp);
break;
case CALL_PROCEEDING:
/*
* We'll just wait for final call status
*/
cop->co_state = COS_OUTCONN;
err = EINPROGRESS;
break;
default:
panic("atm_cm_connect: setup");
}
donex:
(void) splx(s);
done:
if (err && err != EINPROGRESS) {
/*
* Undo any partial setup stuff
*/
if (cop)
uma_zfree(atm_connection_zone, cop);
} else {
/*
* Finish connection setup
*/
s = splnet();
cvp->cvc_flags |= CVCF_CONNQ;
ENQUEUE(cvp, Atm_connvc, cvc_q, atm_connection_queue);
LINK2TAIL(cop, Atm_connection, cop->co_mxh, co_next);
(void) splx(s);
*copp = cop;
}
return (err);
}
/*
* Listen for Incoming ATM Calls
*
* Called by an endpoint service in order to indicate its willingness to
* accept certain incoming calls. The types of calls which the endpoint
* is prepared to accept are specified in the Atm_attributes parameter.
*
* For each call which meets the criteria specified by the endpoint, the
* endpoint service will receive an incoming call notification via the
* endpoint's ep_incoming() function.
*
* To cancel the listening connection, the endpoint user should invoke
* atm_cm_release().
*
* Arguments:
* so optional socket pointer -- if present, will set listen state
* epp pointer to endpoint definition structure
* token endpoint's listen instance token
* ap pointer to listening connection attributes
* copp pointer to location to return allocated connection block
*
* Returns:
* 0 listening connection installed
* errno listen failed - reason indicated
*
*/
int
atm_cm_listen(so, epp, token, ap, copp)
struct socket *so;
Atm_endpoint *epp;
void *token;
Atm_attributes *ap;
Atm_connection **copp;
{
Atm_connection *cop;
int s, err = 0;
*copp = NULL;
/*
* Get a connection block
*/
cop = uma_zalloc(atm_connection_zone, M_WAITOK);
if (cop == NULL)
return (ENOMEM);
/*
* Initialize connection info
*/
cop->co_endpt = epp;
cop->co_toku = token;
cop->co_mxh = cop;
/*
* Validate and extract useful attribute information
*/
/*
* Check out Data API
*/
switch (ap->api) {
case CMAPI_CPCS:
case CMAPI_SAAL:
case CMAPI_SSCOP:
break;
default:
err = EINVAL;
goto done;
}
/*
* AAL Attributes
*/
switch (ap->aal.tag) {
case T_ATM_PRESENT:
switch (ap->aal.type) {
case ATM_AAL5:
case ATM_AAL3_4:
break;
default:
err = EINVAL;
goto done;
}
break;
case T_ATM_ABSENT:
case T_ATM_ANY:
break;
default:
err = EINVAL;
goto done;
}
/*
* Broadband High Layer Information Attributes
*/
switch (ap->bhli.tag) {
case T_ATM_PRESENT:
case T_ATM_ABSENT:
case T_ATM_ANY:
break;
default:
err = EINVAL;
goto done;
}
/*
* Broadband Low Layer Information Attributes
*/
switch (ap->blli.tag_l2) {
case T_ATM_PRESENT:
case T_ATM_ABSENT:
case T_ATM_ANY:
break;
default:
err = EINVAL;
goto done;
}
switch (ap->blli.tag_l3) {
case T_ATM_PRESENT:
case T_ATM_ABSENT:
case T_ATM_ANY:
break;
default:
err = EINVAL;
goto done;
}
/*
* Logical Link Control Attributes
*/
switch (ap->llc.tag) {
case T_ATM_PRESENT:
if ((ap->blli.tag_l2 != T_ATM_PRESENT) ||
(ap->blli.v.layer_2_protocol.ID_type != T_ATM_SIMPLE_ID) ||
(ap->blli.v.layer_2_protocol.ID.simple_ID !=
T_ATM_BLLI2_I8802) ||
(ap->llc.v.llc_len < T_ATM_LLC_MIN_LEN) ||
(ap->llc.v.llc_len > T_ATM_LLC_MAX_LEN)) {
err = EINVAL;
goto done;
}
cop->co_mpx = ATM_ENC_LLC;
cop->co_llc = ap->llc;
break;
case T_ATM_ABSENT:
case T_ATM_ANY:
cop->co_mpx = ATM_ENC_NULL;
break;
default:
err = EINVAL;
goto done;
}
/*
* Called Party Attributes
*/
switch (ap->called.tag) {
case T_ATM_PRESENT:
switch (ap->called.addr.address_format) {
case T_ATM_ABSENT:
ap->called.tag = T_ATM_ABSENT;
break;
case T_ATM_PVC_ADDR:
err = EINVAL;
goto done;
}
break;
case T_ATM_ABSENT:
case T_ATM_ANY:
break;
default:
err = EINVAL;
goto done;
}
/*
* Get an attribute block and save listening attributes
*/
cop->co_lattr = uma_zalloc(atm_attributes_zone, M_WAITOK | M_ZERO);
if (cop->co_lattr == NULL) {
err = ENOMEM;
goto done;
}
*cop->co_lattr = *ap;
/*
* Now try to register the listening connection
*/
if (so != NULL)
SOCK_LOCK(so);
s = splnet();
if (so != NULL)
err = solisten_proto_check(so);
if (err)
goto donex;
if (atm_cm_match(cop->co_lattr, NULL) != NULL) {
/*
* Can't have matching listeners
*/
err = EADDRINUSE;
goto donex;
}
cop->co_state = COS_LISTEN;
LINK2TAIL(cop, Atm_connection, atm_listen_queue, co_next);
if (so != NULL)
solisten_proto(so);
donex:
(void) splx(s);
if (so != NULL)
SOCK_UNLOCK(so);
done:
if (err) {
/*
* Undo any partial setup stuff
*/
if (cop) {
if (cop->co_lattr)
uma_zfree(atm_attributes_zone, cop->co_lattr);
uma_zfree(atm_connection_zone, cop);
}
} else {
/*
* Finish connection setup
*/
*copp = cop;
}
return (err);
}
/*
* Add to LLC Connection
*
* Called by an endpoint service to create a new Connection Manager API
* instance to be associated with an LLC-multiplexed connection instance
* which has been previously created. The endpoint provided token will
* be used in all further CM -> endpoint function calls, and the returned
* connection block pointer must be used in all subsequent endpoint -> CM
* function calls.
*
* If the return indicates that the connection setup has been immediately
* successful, then the connection is ready for data transmission.
*
* If the return indicates that the connection setup is still in progress,
* then the endpoint must wait for notification from the Connection Manager
* indicating the final status of the call setup. If the call setup completes
* successfully, then a "call connected" notification will be sent to the
* endpoint by the Connection Manager. If the call setup fails, then the
* endpoint will receive a "call cleared" notification.
*
* All connection instances must be freed with an atm_cm_release() call.
*
* Arguments:
* epp pointer to endpoint definition structure
* token endpoint's connection instance token
* llc pointer to llc attributes for new connection
* ecop pointer to existing connection block
* copp pointer to location to return allocated connection block
*
* Returns:
* 0 connection has been successfully established
* EINPROGRESS connection establishment is in progress
* errno addllc failed - reason indicated
*
*/
int
atm_cm_addllc(epp, token, llc, ecop, copp)
Atm_endpoint *epp;
void *token;
struct attr_llc *llc;
Atm_connection *ecop;
Atm_connection **copp;
{
Atm_connection *cop, *cop2;
Atm_connvc *cvp;
int s, err;
*copp = NULL;
/*
* Check out requested LLC attributes
*/
if ((llc->tag != T_ATM_PRESENT) ||
((llc->v.flags & T_ATM_LLC_SHARING) == 0) ||
(llc->v.llc_len < T_ATM_LLC_MIN_LEN) ||
(llc->v.llc_len > T_ATM_LLC_MAX_LEN))
return (EINVAL);
/*
* Get a connection block
* May be called from netisr - don't wait.
*/
cop = uma_zalloc(atm_connection_zone, M_NOWAIT);
if (cop == NULL)
return (ENOMEM);
/*
* Initialize connection info
*/
cop->co_endpt = epp;
cop->co_toku = token;
cop->co_llc = *llc;
s = splnet();
/*
* Ensure that supplied connection is really valid
*/
cop2 = NULL;
for (cvp = Q_HEAD(atm_connection_queue, Atm_connvc); cvp;
cvp = Q_NEXT(cvp, Atm_connvc, cvc_q)) {
for (cop2 = cvp->cvc_conn; cop2; cop2 = cop2->co_next) {
if (ecop == cop2)
break;
}
if (cop2)
break;
}
if (cop2 == NULL) {
err = ENOENT;
goto done;
}
switch (ecop->co_state) {
case COS_OUTCONN:
case COS_INACCEPT:
err = EINPROGRESS;
break;
case COS_ACTIVE:
err = 0;
break;
default:
err = EINVAL;
goto done;
}
/*
* Connection must be LLC multiplexed and shared
*/
if ((ecop->co_mpx != ATM_ENC_LLC) ||
((ecop->co_llc.v.flags & T_ATM_LLC_SHARING) == 0)) {
err = EINVAL;
goto done;
}
/*
* This new LLC header must be unique for this VCC
*/
cop2 = ecop->co_mxh;
while (cop2) {
int i = MIN(llc->v.llc_len, cop2->co_llc.v.llc_len);
if (bcmp(llc->v.llc_info, cop2->co_llc.v.llc_info, i) == 0) {
err = EINVAL;
goto done;
}
cop2 = cop2->co_next;
}
/*
* Everything seems to check out
*/
cop->co_flags = ecop->co_flags;
cop->co_state = ecop->co_state;
cop->co_mpx = ecop->co_mpx;
cop->co_connvc = ecop->co_connvc;
LINK2TAIL(cop, Atm_connection, ecop->co_mxh, co_next);
cop->co_mxh = ecop->co_mxh;
done:
(void) splx(s);
if (err && err != EINPROGRESS) {
/*
* Undo any partial setup stuff
*/
if (cop)
uma_zfree(atm_connection_zone, cop);
} else {
/*
* Pass new connection back to caller
*/
*copp = cop;
}
return (err);
}
/*
* XXX
*
* Arguments:
* cop pointer to connection block
* id identifier for party to be added
* addr address of party to be added
*
* Returns:
* 0 addparty successful
* errno addparty failed - reason indicated
*
*/
int
atm_cm_addparty(cop, id, addr)
Atm_connection *cop;
int id;
struct t_atm_sap *addr;
{
return (0);
}
/*
* XXX
*
* Arguments:
* cop pointer to connection block
* id identifier for party to be added
* cause pointer to cause of drop
*
* Returns:
* 0 dropparty successful
* errno dropparty failed - reason indicated
*
*/
int
atm_cm_dropparty(cop, id, cause)
Atm_connection *cop;
int id;
struct t_atm_cause *cause;
{
return (0);
}
/*
* Release Connection Resources
*
* Called by the endpoint service in order to terminate an ATM connection
* and to release all system resources for the connection. This function
* must be called for every allocated connection instance and must only
* be called by the connection's owner.
*
* Arguments:
* cop pointer to connection block
* cause pointer to cause of release
*
* Returns:
* 0 release successful
* errno release failed - reason indicated
*
*/
int
atm_cm_release(cop, cause)
Atm_connection *cop;
struct t_atm_cause *cause;
{
Atm_connvc *cvp;
int s;
s = splnet();
/*
* First, a quick state validation check
*/
switch (cop->co_state) {
case COS_OUTCONN:
case COS_LISTEN:
case COS_INACCEPT:
case COS_ACTIVE:
case COS_CLEAR:
/*
* Break link to user
*/
cop->co_toku = NULL;
break;
case COS_INCONN:
(void) splx(s);
return (EFAULT);
default:
panic("atm_cm_release: bogus conn state");
}
/*
* Check out the VCC state too
*/
if ((cvp = cop->co_connvc) != NULL) {
switch (cvp->cvc_state) {
case CVCS_SETUP:
case CVCS_INIT:
case CVCS_ACCEPT:
case CVCS_ACTIVE:
break;
case CVCS_INCOMING:
(void) splx(s);
return (EFAULT);
case CVCS_CLEAR:
(void) splx(s);
return (EALREADY);
default:
panic("atm_cm_release: bogus connvc state");
}
/*
* If we're the only connection, terminate the VCC
*/
if ((cop->co_mxh == cop) && (cop->co_next == NULL)) {
cvp->cvc_attr.cause.tag = T_ATM_PRESENT;
cvp->cvc_attr.cause.v = *cause;
atm_cm_closevc(cvp);
}
}
/*
* Now get rid of the connection
*/
atm_cm_closeconn(cop, cause);
return (0);
}
/*
* Abort an ATM Connection VCC
*
* This function allows any non-owner kernel entity to request an
* immediate termination of an ATM VCC. This will normally be called
* when encountering a catastrophic error condition that cannot be
* resolved via the available stack protocols. The connection manager
* will schedule the connection's termination, including notifying the
* connection owner of the termination.
*
* This function should only be called by a stack entity instance. After
* calling the function, the caller should set a protocol state which just
* waits for a <sap>_TERM stack command to be delivered.
*
* Arguments:
* cvp pointer to connection VCC block
* cause pointer to cause of abort
*
* Returns:
* 0 abort successful
* errno abort failed - reason indicated
*
*/
int
atm_cm_abort(cvp, cause)
Atm_connvc *cvp;
struct t_atm_cause *cause;
{
ATM_DEBUG2("atm_cm_abort: cvp=%p cause=%d\n",
cvp, cause->cause_value);
/*
* Note that we're aborting
*/
cvp->cvc_flags |= CVCF_ABORTING;
switch (cvp->cvc_state) {
case CVCS_INIT:
/*
* In-line code will handle this
*/
cvp->cvc_attr.cause.tag = T_ATM_PRESENT;
cvp->cvc_attr.cause.v = *cause;
break;
case CVCS_SETUP:
case CVCS_ACCEPT:
case CVCS_ACTIVE:
/*
* Schedule connection termination, since we want
* to avoid any sequencing interactions
*/
cvp->cvc_attr.cause.tag = T_ATM_PRESENT;
cvp->cvc_attr.cause.v = *cause;
CVC_TIMER(cvp, 0);
break;
case CVCS_REJECT:
case CVCS_RELEASE:
case CVCS_CLEAR:
case CVCS_TERM:
/*
* Ignore abort, as we're already terminating
*/
break;
default:
log(LOG_ERR,
"atm_cm_abort: invalid state: cvp=%p, state=%d\n",
cvp, cvp->cvc_state);
}
return (0);
}
/*
* Incoming ATM Call Received
*
* Called by a signalling manager to indicate that a new call request has
* been received. This function will allocate and initialize the connection
* manager control blocks and queue this call request. The call request
* processing function, atm_cm_procinq(), will be scheduled to perform the
* call processing.
*
* Arguments:
* vcp pointer to incoming call's VCC control block
* ap pointer to incoming call's attributes
*
* Returns:
* 0 call queuing successful
* errno call queuing failed - reason indicated
*
*/
int
atm_cm_incoming(vcp, ap)
struct vccb *vcp;
Atm_attributes *ap;
{
Atm_connvc *cvp;
int s, err;
/*
* Do some minimal attribute validation
*/
/*
* Must specify a network interface
*/
if (ap->nif == NULL)
return (EINVAL);
/*
* AAL Attributes
*/
if ((ap->aal.tag != T_ATM_PRESENT) ||
((ap->aal.type != ATM_AAL5) &&
(ap->aal.type != ATM_AAL3_4)))
return (EINVAL);
/*
* Traffic Descriptor Attributes
*/
if ((ap->traffic.tag != T_ATM_PRESENT) &&
(ap->traffic.tag != T_ATM_ABSENT))
return (EINVAL);
/*
* Broadband Bearer Attributes
*/
if ((ap->bearer.tag != T_ATM_PRESENT) ||
((ap->bearer.v.connection_configuration != T_ATM_1_TO_1) &&
(ap->bearer.v.connection_configuration != T_ATM_1_TO_MANY)))
return (EINVAL);
/*
* Broadband High Layer Attributes
*/
if ((ap->bhli.tag != T_ATM_PRESENT) &&
(ap->bhli.tag != T_ATM_ABSENT))
return (EINVAL);
/*
* Broadband Low Layer Attributes
*/
if ((ap->blli.tag_l2 != T_ATM_PRESENT) &&
(ap->blli.tag_l2 != T_ATM_ABSENT))
return (EINVAL);
if ((ap->blli.tag_l3 != T_ATM_PRESENT) &&
(ap->blli.tag_l3 != T_ATM_ABSENT))
return (EINVAL);
/*
* Logical Link Control Attributes
*/
if (ap->llc.tag == T_ATM_PRESENT)
return (EINVAL);
ap->llc.tag = T_ATM_ANY;
/*
* Called Party Attributes
*/
if ((ap->called.tag != T_ATM_PRESENT) ||
(ap->called.addr.address_format == T_ATM_ABSENT))
return (EINVAL);
if (ap->called.tag == T_ATM_ABSENT) {
ap->called.addr.address_format = T_ATM_ABSENT;
ap->called.addr.address_length = 0;
ap->called.subaddr.address_format = T_ATM_ABSENT;
ap->called.subaddr.address_length = 0;
}
/*
* Calling Party Attributes
*/
if ((ap->calling.tag != T_ATM_PRESENT) &&
(ap->calling.tag != T_ATM_ABSENT))
return (EINVAL);
if (ap->calling.tag == T_ATM_ABSENT) {
ap->calling.addr.address_format = T_ATM_ABSENT;
ap->calling.addr.address_length = 0;
ap->calling.subaddr.address_format = T_ATM_ABSENT;
ap->calling.subaddr.address_length = 0;
}
/*
* Quality of Service Attributes
*/
if (ap->qos.tag != T_ATM_PRESENT)
return (EINVAL);
/*
* Transit Network Attributes
*/
if ((ap->transit.tag != T_ATM_PRESENT) &&
(ap->transit.tag != T_ATM_ABSENT))
return (EINVAL);
/*
* Cause Attributes
*/
if ((ap->cause.tag != T_ATM_PRESENT) &&
(ap->cause.tag != T_ATM_ABSENT))
return (EINVAL);
/*
* Get a connection VCC block
* May be called from netisr - don't wait.
*/
cvp = uma_zalloc(atm_connvc_zone, M_NOWAIT);
if (cvp == NULL) {
err = ENOMEM;
goto fail;
}
/*
* Initialize the control block
*/
cvp->cvc_vcc = vcp;
cvp->cvc_sigmgr = vcp->vc_pif->pif_sigmgr;
cvp->cvc_attr = *ap;
cvp->cvc_state = CVCS_INCOMING;
/*
* Control queue length
*/
s = splnet();
if (atm_incoming_qlen >= ATM_CALLQ_MAX) {
(void) splx(s);
err = EBUSY;
goto fail;
}
/*
* Queue request and schedule call processing function
*/
cvp->cvc_flags |= CVCF_INCOMQ;
ENQUEUE(cvp, Atm_connvc, cvc_q, atm_incoming_queue);
if (atm_incoming_qlen++ == 0) {
timeout(atm_cm_procinq, (void *)0, 0);
}
/*
* Link for signalling manager
*/
vcp->vc_connvc = cvp;
(void) splx(s);
return (0);
fail:
/*
* Free any resources
*/
if (cvp)
uma_zfree(atm_connvc_zone, cvp);
return (err);
}
/*
* VCC Connected Notification
*
* This function is called by a signalling manager as notification that a
* VCC call setup has been successful.
*
* Arguments:
* cvp pointer to connection VCC block
*
* Returns:
* none
*
*/
void
atm_cm_connected(cvp)
Atm_connvc *cvp;
{
Atm_connection *cop, *cop2;
KBuffer *m;
int s, err;
s = splnet();
/*
* Validate connection vcc
*/
switch (cvp->cvc_state) {
case CVCS_SETUP:
/*
* Initialize the stack
*/
cvp->cvc_state = CVCS_INIT;
STACK_CALL(atm_stackcmds[cvp->cvc_attr.api].init,
cvp->cvc_lower, cvp->cvc_tokl,
cvp, cvp->cvc_attr.api_init, 0, err);
if (err)
panic("atm_cm_connected: init");
if (cvp->cvc_flags & CVCF_ABORTING) {
/*
* Someone on the stack bailed out...notify all of the
* connections and schedule the VCC termination
*/
cop = cvp->cvc_conn;
while (cop) {
cop2 = cop->co_next;
atm_cm_closeconn(cop, &cvp->cvc_attr.cause.v);
cop = cop2;
}
atm_cm_closevc(cvp);
(void) splx(s);
return;
}
break;
case CVCS_ACCEPT:
/*
* Stack already initialized
*/
break;
default:
panic("atm_cm_connected: connvc state");
}
/*
* VCC is ready for action
*/
cvp->cvc_state = CVCS_ACTIVE;
/*
* Notify all connections that the call has completed
*/
cop = cvp->cvc_conn;
while (cop) {
cop2 = cop->co_next;
switch (cop->co_state) {
case COS_OUTCONN:
case COS_INACCEPT:
cop->co_state = COS_ACTIVE;
(*cop->co_endpt->ep_connected)(cop->co_toku);
break;
case COS_ACTIVE:
/*
* May get here if an ep_connected() call (from
* above) results in an atm_cm_addllc() call for
* the just connected connection.
*/
break;
default:
panic("atm_cm_connected: connection state");
}
cop = cop2;
}
(void) splx(s);
/*
* Input any queued packets
*/
while ((m = cvp->cvc_rcvq) != NULL) {
cvp->cvc_rcvq = KB_QNEXT(m);
cvp->cvc_rcvqlen--;
KB_QNEXT(m) = NULL;
/*
* Currently only supported for CPCS API
*/
atm_cm_cpcs_upper(CPCS_UNITDATA_SIG, cvp, (intptr_t)m, 0);
}
return;
}
/*
* VCC Cleared Notification
*
* This function is called by a signalling manager as notification that a
* VCC call has been cleared. The cause information describing the reason
* for the call clearing will be contained in the connection VCC attributes.
*
* Arguments:
* cvp pointer to connection VCC block
*
* Returns:
* none
*
*/
void
atm_cm_cleared(cvp)
Atm_connvc *cvp;
{
Atm_connection *cop, *cop2;
int s;
KASSERT((cvp->cvc_state != CVCS_FREE) && (cvp->cvc_state < CVCS_CLEAR),
("atm_cm_cleared: state sanity check failed"));
cvp->cvc_state = CVCS_CLEAR;
s = splnet();
/*
* Terminate all connections
*/
cop = cvp->cvc_conn;
while (cop) {
cop2 = cop->co_next;
atm_cm_closeconn(cop, &cvp->cvc_attr.cause.v);
cop = cop2;
}
/*
* Clean up connection VCC
*/
atm_cm_closevc(cvp);
(void) splx(s);
return;
}
/*
* Process Incoming Call Queue
*
* This function is scheduled by atm_cm_incoming() in order to process
* all the entries on the incoming call queue.
*
* Arguments:
* arg argument passed on timeout() call
*
* Returns:
* none
*
*/
static KTimeout_ret
atm_cm_procinq(arg)
void *arg;
{
Atm_connvc *cvp;
int cnt = 0, s;
/*
* Only process incoming calls up to our quota
*/
while (cnt++ < ATM_CALLQ_MAX) {
s = splnet();
/*
* Get next awaiting call
*/
cvp = Q_HEAD(atm_incoming_queue, Atm_connvc);
if (cvp == NULL) {
(void) splx(s);
break;
}
DEQUEUE(cvp, Atm_connvc, cvc_q, atm_incoming_queue);
atm_incoming_qlen--;
cvp->cvc_flags &= ~CVCF_INCOMQ;
/*
* Handle the call
*/
atm_cm_incall(cvp);
(void) splx(s);
}
/*
* If we've expended our quota, reschedule ourselves
*/
if (cnt >= ATM_CALLQ_MAX)
timeout(atm_cm_procinq, (void *)0, 0);
}
/*
* Process Incoming Call
*
* This function will search through the listening queue and try to find
* matching endpoint(s) for the incoming call. If we find any, we will
* notify the endpoint service(s) of the incoming call and will then
* notify the signalling manager to progress the call to an active status.
*
* If there are no listeners for the call, the signalling manager will be
* notified of a call rejection.
*
* Called at splnet.
*
* Arguments:
* cvp pointer to connection VCC for incoming call
*
* Returns:
* none
*
*/
static void
atm_cm_incall(cvp)
Atm_connvc *cvp;
{
Atm_connection *cop, *lcop, *hcop;
Atm_attributes attr;
int err;
hcop = NULL;
lcop = NULL;
cop = NULL;
attr = cvp->cvc_attr;
/*
* Look for matching listeners
*/
while ((lcop = atm_cm_match(&attr, lcop)) != NULL) {
if (cop == NULL) {
/*
* Need a new connection block
* May be called from timeout - dont wait.
*/
cop = uma_zalloc(atm_connection_zone, M_NOWAIT);
if (cop == NULL) {
cvp->cvc_attr.cause = atm_cause_tmpl;
cvp->cvc_attr.cause.v.cause_value =
T_ATM_CAUSE_TEMPORARY_FAILURE;
goto fail;
}
}
/*
* Initialize connection from listener and incoming call
*/
cop->co_mxh = NULL;
cop->co_state = COS_INCONN;
cop->co_mpx = lcop->co_mpx;
cop->co_endpt = lcop->co_endpt;
cop->co_llc = lcop->co_llc;
switch (attr.bearer.v.connection_configuration) {
case T_ATM_1_TO_1:
cop->co_flags |= COF_P2P;
break;
case T_ATM_1_TO_MANY:
/* Not supported */
cop->co_flags |= COF_P2MP;
cvp->cvc_attr.cause = atm_cause_tmpl;
cvp->cvc_attr.cause.v.cause_value =
T_ATM_CAUSE_BEARER_CAPABILITY_NOT_IMPLEMENTED;
goto fail;
}
/*
* Notify endpoint of incoming call
*/
err = (*cop->co_endpt->ep_incoming)
(lcop->co_toku, cop, &cvp->cvc_attr, &cop->co_toku);
if (err == 0) {
/*
* Endpoint has accepted the call
*
* Setup call attributes
*/
if (hcop == NULL) {
cvp->cvc_attr.api = lcop->co_lattr->api;
cvp->cvc_attr.api_init =
lcop->co_lattr->api_init;
cvp->cvc_attr.llc = lcop->co_lattr->llc;
}
cvp->cvc_attr.headin = MAX(cvp->cvc_attr.headin,
lcop->co_lattr->headin);
/*
* Setup connection info and queueing
*/
cop->co_state = COS_INACCEPT;
cop->co_connvc = cvp;
LINK2TAIL(cop, Atm_connection, hcop, co_next);
cop->co_mxh = hcop;
/*
* Need a new connection block next time around
*/
cop = NULL;
} else {
/*
* Endpoint refuses call
*/
goto fail;
}
}
/*
* We're done looking for listeners
*/
if (hcop) {
/*
* Someone actually wants the call, so notify
* the signalling manager to continue
*/
cvp->cvc_flags |= CVCF_CONNQ;
ENQUEUE(cvp, Atm_connvc, cvc_q, atm_connection_queue);
if (atm_cm_accept(cvp, hcop))
goto fail;
} else {
/*
* Nobody around to take the call
*/
cvp->cvc_attr.cause = atm_cause_tmpl;
cvp->cvc_attr.cause.v.cause_value =
T_ATM_CAUSE_INCOMPATIBLE_DESTINATION;
goto fail;
}
/*
* Clean up loose ends
*/
if (cop)
uma_zfree(atm_connection_zone, cop);
/*
* Call has been accepted
*/
return;
fail:
/*
* Call failed - notify any endpoints of the call failure
*/
/*
* Clean up loose ends
*/
if (cop)
uma_zfree(atm_connection_zone, cop);
if (cvp->cvc_attr.cause.tag != T_ATM_PRESENT) {
cvp->cvc_attr.cause = atm_cause_tmpl;
cvp->cvc_attr.cause.v.cause_value =
T_ATM_CAUSE_UNSPECIFIED_NORMAL;
}
cop = hcop;
while (cop) {
Atm_connection *cop2 = cop->co_next;
atm_cm_closeconn(cop, &cvp->cvc_attr.cause.v);
cop = cop2;
}
/*
* Tell the signalling manager to reject the call
*/
atm_cm_closevc(cvp);
return;
}
/*
* Accept an Incoming ATM Call
*
* Some endpoint service(s) wants to accept an incoming call, so the
* signalling manager will be notified to attempt to progress the call
* to an active status.
*
* If the signalling manager indicates that connection activation has
* been immediately successful, then all of the endpoints will be notified
* that the connection is ready for data transmission.
*
* If the return indicates that connection activation is still in progress,
* then the endpoints must wait for notification from the Connection Manager
* indicating the final status of the call setup. If the call setup completes
* successfully, then a "call connected" notification will be sent to the
* endpoints by the Connection Manager. If the call setup fails, then the
* endpoints will receive a "call cleared" notification.
*
* Called at splnet.
*
* Arguments:
* cvp pointer to connection VCC for incoming call
* cop pointer to head of accepted connections
*
* Returns:
* 0 connection has been successfully activated
* errno accept failed - reason indicated
*
*/
static int
atm_cm_accept(cvp, cop)
Atm_connvc *cvp;
Atm_connection *cop;
{
struct stack_list sl;
void (*upf)(int, void *, intptr_t, intptr_t);
int sli, err, err2;
/*
* Link vcc to connections
*/
cvp->cvc_conn = cop;
/*
* Initialize stack list index
*/
sli = 0;
/*
* Check out Data API
*/
switch (cvp->cvc_attr.api) {
case CMAPI_CPCS:
upf = atm_cm_cpcs_upper;
break;
case CMAPI_SAAL:
sl.sl_sap[sli++] = SAP_SSCF_UNI;
sl.sl_sap[sli++] = SAP_SSCOP;
upf = atm_cm_saal_upper;
break;
case CMAPI_SSCOP:
sl.sl_sap[sli++] = SAP_SSCOP;
upf = atm_cm_sscop_upper;
break;
default:
upf = NULL;
}
/*
* AAL Attributes
*/
switch (cvp->cvc_attr.aal.type) {
case ATM_AAL5:
sl.sl_sap[sli++] = SAP_CPCS_AAL5;
sl.sl_sap[sli++] = SAP_SAR_AAL5;
sl.sl_sap[sli++] = SAP_ATM;
break;
case ATM_AAL3_4:
sl.sl_sap[sli++] = SAP_CPCS_AAL3_4;
sl.sl_sap[sli++] = SAP_SAR_AAL3_4;
sl.sl_sap[sli++] = SAP_ATM;
break;
}
/*
* Terminate stack list
*/
sl.sl_sap[sli] = 0;
/*
* Create a service stack
*/
err = atm_create_stack(cvp, &sl, upf);
if (err) {
goto done;
}
/*
* Let the signalling manager finish the VCC activation
*/
switch ((*cvp->cvc_sigmgr->sm_accept)(cvp->cvc_vcc, &err)) {
case CALL_PROCEEDING:
/*
* Note that we're not finished yet
*/
err = EINPROGRESS;
/* FALLTHRU */
case CALL_CONNECTED:
/*
* Initialize the stack now, even if the call isn't totally
* active yet. We want to avoid the delay between getting
* the "call connected" event and actually notifying the
* adapter to accept cells on the new VCC - if the delay is
* too long, then we end up dropping the first pdus sent by
* the caller.
*/
cvp->cvc_state = CVCS_INIT;
STACK_CALL(atm_stackcmds[cvp->cvc_attr.api].init,
cvp->cvc_lower, cvp->cvc_tokl, cvp,
cvp->cvc_attr.api_init, 0, err2);
if (err2)
panic("atm_cm_accept: init");
if (cvp->cvc_flags & CVCF_ABORTING) {
/*
* Someone on the stack bailed out...schedule the
* VCC and stack termination
*/
err = ECONNABORTED;
} else {
/*
* Everything looks fine from here
*/
if (err)
cvp->cvc_state = CVCS_ACCEPT;
else
cvp->cvc_state = CVCS_ACTIVE;
}
break;
case CALL_FAILED:
/*
* Terminate stack and clean up before we leave
*/
cvp->cvc_state = CVCS_CLEAR;
break;
default:
panic("atm_cm_accept: accept");
}
done:
if (err == 0) {
/*
* Call has been connected, notify endpoints
*/
while (cop) {
Atm_connection *cop2 = cop->co_next;
cop->co_state = COS_ACTIVE;
(*cop->co_endpt->ep_connected)(cop->co_toku);
cop = cop2;
}
} else if (err == EINPROGRESS) {
/*
* Call is still in progress, endpoint must wait
*/
err = 0;
} else {
/*
* Let caller know we failed
*/
cvp->cvc_attr.cause = atm_cause_tmpl;
cvp->cvc_attr.cause.v.cause_value =
T_ATM_CAUSE_UNSPECIFIED_RESOURCE_UNAVAILABLE;
}
return (err);
}
/*
* Match Attributes on Listening Queue
*
* This function will attempt to match the supplied connection attributes
* with one of the registered attributes in the listening queue. The pcop
* argument may be supplied in order to allow multiple listeners to share
* an incoming call (if supported by the listeners).
*
* Called at splnet.
*
* Arguments:
* ap pointer to attributes to be matched
* pcop pointer to the previously matched connection
*
* Returns:
* addr connection with which a match was found
* 0 no match found
*
*/
Atm_connection *
atm_cm_match(ap, pcop)
Atm_attributes *ap;
Atm_connection *pcop;
{
Atm_connection *cop;
Atm_attributes *lap;
/*
* If we've already matched a listener...
*/
if (pcop) {
/*
* Make sure already matched listener supports sharing
*/
if ((pcop->co_mpx != ATM_ENC_LLC) ||
((pcop->co_llc.v.flags & T_ATM_LLC_SHARING) == 0))
return (NULL);
/*
* Position ourselves after the matched entry
*/
for (cop = atm_listen_queue; cop; cop = cop->co_next) {
if (cop == pcop) {
cop = pcop->co_next;
break;
}
}
} else {
/*
* Start search at top of listening queue
*/
cop = atm_listen_queue;
}
/*
* Search through listening queue
*/
for (; cop; cop = cop->co_next) {
lap = cop->co_lattr;
/*
* If we're trying to share, check that this entry allows it
*/
if (pcop) {
if ((cop->co_mpx != ATM_ENC_LLC) ||
((cop->co_llc.v.flags & T_ATM_LLC_SHARING) == 0))
continue;
}
/*
* ALL "matchable" attributes must match
*/
/*
* BHLI
*/
if (lap->bhli.tag == T_ATM_ABSENT) {
if (ap->bhli.tag == T_ATM_PRESENT)
continue;
} else if (lap->bhli.tag == T_ATM_PRESENT) {
if (ap->bhli.tag == T_ATM_ABSENT)
continue;
if (ap->bhli.tag == T_ATM_PRESENT)
if (bcmp(&lap->bhli.v, &ap->bhli.v,
sizeof(struct t_atm_bhli)))
continue;
}
/*
* BLLI Layer 2
*/
if (lap->blli.tag_l2 == T_ATM_ABSENT) {
if (ap->blli.tag_l2 == T_ATM_PRESENT)
continue;
} else if (lap->blli.tag_l2 == T_ATM_PRESENT) {
if (ap->blli.tag_l2 == T_ATM_ABSENT)
continue;
if (ap->blli.tag_l2 == T_ATM_PRESENT) {
if (bcmp(&lap->blli.v.layer_2_protocol.ID,
&ap->blli.v.layer_2_protocol.ID,
sizeof(
ap->blli.v.layer_2_protocol.ID)))
continue;
}
}
/*
* BLLI Layer 3
*/
if (lap->blli.tag_l3 == T_ATM_ABSENT) {
if (ap->blli.tag_l3 == T_ATM_PRESENT)
continue;
} else if (lap->blli.tag_l3 == T_ATM_PRESENT) {
if (ap->blli.tag_l3 == T_ATM_ABSENT)
continue;
if (ap->blli.tag_l3 == T_ATM_PRESENT) {
if (bcmp(&lap->blli.v.layer_3_protocol.ID,
&ap->blli.v.layer_3_protocol.ID,
sizeof(
ap->blli.v.layer_3_protocol.ID)))
continue;
}
}
/*
* LLC
*/
if (lap->llc.tag == T_ATM_ABSENT) {
if (ap->llc.tag == T_ATM_PRESENT)
continue;
} else if (lap->llc.tag == T_ATM_PRESENT) {
if (ap->llc.tag == T_ATM_ABSENT)
continue;
if (ap->llc.tag == T_ATM_PRESENT) {
int i = MIN(lap->llc.v.llc_len,
ap->llc.v.llc_len);
if (bcmp(lap->llc.v.llc_info,
ap->llc.v.llc_info, i))
continue;
}
}
/*
* AAL
*/
if (lap->aal.tag == T_ATM_ABSENT) {
if (ap->aal.tag == T_ATM_PRESENT)
continue;
} else if (lap->aal.tag == T_ATM_PRESENT) {
if (ap->aal.tag == T_ATM_ABSENT)
continue;
if (ap->aal.tag == T_ATM_PRESENT) {
if (lap->aal.type != ap->aal.type)
continue;
if (lap->aal.type == ATM_AAL5) {
if (lap->aal.v.aal5.SSCS_type !=
ap->aal.v.aal5.SSCS_type)
continue;
} else {
if (lap->aal.v.aal4.SSCS_type !=
ap->aal.v.aal4.SSCS_type)
continue;
}
}
}
/*
* Called Party
*/
if (lap->called.tag == T_ATM_ABSENT) {
if (ap->called.tag == T_ATM_PRESENT)
continue;
} else if (lap->called.tag == T_ATM_PRESENT) {
if (ap->called.tag == T_ATM_ABSENT)
continue;
if (ap->called.tag == T_ATM_PRESENT) {
if ((!ATM_ADDR_EQUAL(&lap->called.addr,
&ap->called.addr)) ||
(!ATM_ADDR_EQUAL(&lap->called.subaddr,
&ap->called.subaddr)))
continue;
}
}
/*
* Found a full match - return it
*/
break;
}
return (cop);
}
/*
* Find Shareable LLC VCC
*
* Given an endpoint-supplied connection attribute using LLC multiplexing,
* this function will attempt to locate an existing connection which meets
* the requirements of the supplied attributes.
*
* Called at splnet.
*
* Arguments:
* ap pointer to requested attributes
*
* Returns:
* addr shareable LLC connection VCC
* 0 no shareable VCC available
*
*/
static Atm_connvc *
atm_cm_share_llc(ap)
Atm_attributes *ap;
{
Atm_connection *cop;
Atm_connvc *cvp;
/*
* Is requestor willing to share?
*/
if ((ap->llc.v.flags & T_ATM_LLC_SHARING) == 0)
return (NULL);
/*
* Try to find a shareable connection
*/
for (cvp = Q_HEAD(atm_connection_queue, Atm_connvc); cvp;
cvp = Q_NEXT(cvp, Atm_connvc, cvc_q)) {
/*
* Dont use terminating connections
*/
switch (cvp->cvc_state) {
case CVCS_SETUP:
case CVCS_ACCEPT:
case CVCS_ACTIVE:
break;
default:
continue;
}
/*
* Is connection LLC and shareable?
*/
if ((cvp->cvc_attr.llc.tag != T_ATM_PRESENT) ||
((cvp->cvc_attr.llc.v.flags & T_ATM_LLC_SHARING) == 0))
continue;
/*
* Match requested attributes with existing connection
*/
if (ap->nif != cvp->cvc_attr.nif)
continue;
if ((ap->api != cvp->cvc_attr.api) ||
(ap->api_init != cvp->cvc_attr.api_init))
continue;
/*
* Remote Party
*/
if (cvp->cvc_flags & CVCF_CALLER) {
if ((!ATM_ADDR_EQUAL(&ap->called.addr,
&cvp->cvc_attr.called.addr)) ||
(!ATM_ADDR_EQUAL(&ap->called.subaddr,
&cvp->cvc_attr.called.subaddr)))
continue;
} else {
if (cvp->cvc_attr.calling.tag != T_ATM_PRESENT)
continue;
if ((!ATM_ADDR_EQUAL(&ap->called.addr,
&cvp->cvc_attr.calling.addr)) ||
(!ATM_ADDR_EQUAL(&ap->called.subaddr,
&cvp->cvc_attr.calling.subaddr)))
continue;
}
/*
* AAL
*/
if (ap->aal.type == ATM_AAL5) {
struct t_atm_aal5 *ap5, *cv5;
ap5 = &ap->aal.v.aal5;
cv5 = &cvp->cvc_attr.aal.v.aal5;
if ((cvp->cvc_attr.aal.type != ATM_AAL5) ||
(ap5->SSCS_type != cv5->SSCS_type))
continue;
if (cvp->cvc_flags & CVCF_CALLER) {
if (ap5->forward_max_SDU_size >
cv5->forward_max_SDU_size)
continue;
} else {
if (ap5->forward_max_SDU_size >
cv5->backward_max_SDU_size)
continue;
}
} else {
struct t_atm_aal4 *ap4, *cv4;
ap4 = &ap->aal.v.aal4;
cv4 = &cvp->cvc_attr.aal.v.aal4;
if ((cvp->cvc_attr.aal.type != ATM_AAL3_4) ||
(ap4->SSCS_type != cv4->SSCS_type))
continue;
if (cvp->cvc_flags & CVCF_CALLER) {
if (ap4->forward_max_SDU_size >
cv4->forward_max_SDU_size)
continue;
} else {
if (ap4->forward_max_SDU_size >
cv4->backward_max_SDU_size)
continue;
}
}
/*
* Traffic Descriptor
*/
if ((ap->traffic.tag != T_ATM_PRESENT) ||
(cvp->cvc_attr.traffic.tag != T_ATM_PRESENT) ||
(ap->traffic.v.best_effort != T_YES) ||
(cvp->cvc_attr.traffic.v.best_effort != T_YES))
continue;
/*
* Broadband Bearer
*/
if (ap->bearer.v.connection_configuration !=
cvp->cvc_attr.bearer.v.connection_configuration)
continue;
/*
* QOS
*/
if (cvp->cvc_flags & CVCF_CALLER) {
if ((ap->qos.v.forward.qos_class !=
cvp->cvc_attr.qos.v.forward.qos_class) ||
(ap->qos.v.backward.qos_class !=
cvp->cvc_attr.qos.v.backward.qos_class))
continue;
} else {
if ((ap->qos.v.forward.qos_class !=
cvp->cvc_attr.qos.v.backward.qos_class) ||
(ap->qos.v.backward.qos_class !=
cvp->cvc_attr.qos.v.forward.qos_class))
continue;
}
/*
* The new LLC header must also be unique for this VCC
*/
for (cop = cvp->cvc_conn; cop; cop = cop->co_next) {
int i = MIN(ap->llc.v.llc_len,
cop->co_llc.v.llc_len);
if (bcmp(ap->llc.v.llc_info,
cop->co_llc.v.llc_info, i) == 0)
break;
}
/*
* If no header overlaps, then we're done
*/
if (cop == NULL)
break;
}
return (cvp);
}
/*
* Close Connection
*
* This function will terminate a connection, including notifying the
* user, if necessary, and freeing up control block memory. The caller
* is responsible for managing the connection VCC.
*
* Called at splnet.
*
* Arguments:
* cop pointer to connection block
* cause pointer to cause of close
*
* Returns:
* none
*
*/
static void
atm_cm_closeconn(cop, cause)
Atm_connection *cop;
struct t_atm_cause *cause;
{
/*
* Decide whether user needs notification
*/
switch (cop->co_state) {
case COS_OUTCONN:
case COS_LISTEN:
case COS_INCONN:
case COS_INACCEPT:
case COS_ACTIVE:
/*
* Yup, let 'em know connection is gone
*/
if (cop->co_toku)
(*cop->co_endpt->ep_cleared)(cop->co_toku, cause);
break;
case COS_CLEAR:
/*
* Nope,they should know already
*/
break;
default:
panic("atm_cm_closeconn: bogus state");
}
/*
* Unlink connection from its queues
*/
switch (cop->co_state) {
case COS_LISTEN:
uma_zfree(atm_attributes_zone, cop->co_lattr);
UNLINK(cop, Atm_connection, atm_listen_queue, co_next);
break;
default:
/*
* Remove connection from multiplexor queue
*/
if (cop->co_mxh != cop) {
/*
* Connection is down the chain, just unlink it
*/
UNLINK(cop, Atm_connection, cop->co_mxh, co_next);
} else if (cop->co_next != NULL) {
/*
* Connection is at the head of a non-singleton chain,
* so unlink and reset the chain head
*/
Atm_connection *t, *nhd;
t = nhd = cop->co_next;
while (t) {
t->co_mxh = nhd;
t = t->co_next;
}
if (nhd->co_connvc)
nhd->co_connvc->cvc_conn = nhd;
}
}
/*
* Free the connection block
*/
cop->co_state = COS_FREE;
uma_zfree(atm_connection_zone, cop);
return;
}
/*
* Close Connection VCC
*
* This function will terminate a connection VCC, including releasing the
* the call to the signalling manager, terminating the VCC protocol stack,
* and freeing up control block memory.
*
* Called at splnet.
*
* Arguments:
* cvp pointer to connection VCC block
*
* Returns:
* none
*
*/
static void
atm_cm_closevc(cvp)
Atm_connvc *cvp;
{
int err;
/*
* Break links with the connection block
*/
cvp->cvc_conn = NULL;
/*
* Cancel any running timer
*/
CVC_CANCEL(cvp);
/*
* Free queued packets
*/
while (cvp->cvc_rcvq) {
KBuffer *m;
m = cvp->cvc_rcvq;
cvp->cvc_rcvq = KB_QNEXT(m);
KB_QNEXT(m) = NULL;
KB_FREEALL(m);
}
/*
* Unlink from any queues
*/
if (cvp->cvc_flags & CVCF_INCOMQ) {
DEQUEUE(cvp, Atm_connvc, cvc_q, atm_incoming_queue);
atm_incoming_qlen--;
cvp->cvc_flags &= ~CVCF_INCOMQ;
} else if (cvp->cvc_flags & CVCF_CONNQ) {
DEQUEUE(cvp, Atm_connvc, cvc_q, atm_connection_queue);
cvp->cvc_flags &= ~CVCF_CONNQ;
}
/*
* Release the signalling call
*/
switch (cvp->cvc_state) {
case CVCS_SETUP:
case CVCS_INIT:
case CVCS_ACCEPT:
case CVCS_ACTIVE:
case CVCS_RELEASE:
if (cvp->cvc_vcc) {
cvp->cvc_state = CVCS_RELEASE;
switch ((*cvp->cvc_sigmgr->sm_release)
(cvp->cvc_vcc, &err)) {
case CALL_CLEARED:
/*
* Looks good so far...
*/
break;
case CALL_PROCEEDING:
/*
* We'll have to wait for the call to clear
*/
return;
case CALL_FAILED:
/*
* If there's a memory shortage, retry later.
* Otherwise who knows what's going on....
*/
if ((err == ENOMEM) || (err == ENOBUFS)) {
CVC_TIMER(cvp, 1 * ATM_HZ);
return;
}
log(LOG_ERR,
"atm_cm_closevc: release %d\n", err);
break;
}
}
break;
case CVCS_INCOMING:
case CVCS_REJECT:
if (cvp->cvc_vcc) {
cvp->cvc_state = CVCS_REJECT;
switch ((*cvp->cvc_sigmgr->sm_reject)
(cvp->cvc_vcc, &err)) {
case CALL_CLEARED:
/*
* Looks good so far...
*/
break;
case CALL_FAILED:
/*
* If there's a memory shortage, retry later.
* Otherwise who knows what's going on....
*/
if ((err == ENOMEM) || (err == ENOBUFS)) {
CVC_TIMER(cvp, 1 * ATM_HZ);
return;
}
log(LOG_ERR,
"atm_cm_closevc: reject %d\n", err);
break;
}
}
break;
case CVCS_CLEAR:
case CVCS_TERM:
/*
* No need for anything here
*/
break;
default:
panic("atm_cm_closevc: bogus state");
}
/*
* Now terminate the stack
*/
if (cvp->cvc_tokl) {
cvp->cvc_state = CVCS_TERM;
/*
* Wait until stack is unwound before terminating
*/
if ((cvp->cvc_downcnt > 0) || (cvp->cvc_upcnt > 0)) {
CVC_TIMER(cvp, 0);
return;
}
STACK_CALL(atm_stackcmds[cvp->cvc_attr.api].term,
cvp->cvc_lower, cvp->cvc_tokl, cvp, 0, 0, err);
cvp->cvc_tokl = NULL;
}
/*
* Let signalling manager finish up
*/
cvp->cvc_state = CVCS_FREE;
if (cvp->cvc_vcc) {
(void) (*cvp->cvc_sigmgr->sm_free)(cvp->cvc_vcc);
}
/*
* Finally, free our own control blocks
*/
uma_zfree(atm_connvc_zone, cvp);
return;
}
/*
* Process a Connection VCC timeout
*
* Called when a previously scheduled cvc control block timer expires.
* Processing will be based on the current cvc state.
*
* Called at splnet.
*
* Arguments:
* tip pointer to cvc timer control block
*
* Returns:
* none
*
*/
static void
atm_cm_timeout(tip)
struct atm_time *tip;
{
Atm_connection *cop, *cop2;
Atm_connvc *cvp;
/*
* Back-off to cvc control block
*/
cvp = (Atm_connvc *)
((caddr_t)tip - (int)(&((Atm_connvc *)0)->cvc_time));
/*
* Process timeout based on protocol state
*/
switch (cvp->cvc_state) {
case CVCS_SETUP:
case CVCS_ACCEPT:
case CVCS_ACTIVE:
/*
* Handle VCC abort
*/
if ((cvp->cvc_flags & CVCF_ABORTING) == 0)
goto logerr;
/*
* Terminate all connections
*/
cop = cvp->cvc_conn;
while (cop) {
cop2 = cop->co_next;
atm_cm_closeconn(cop, &cvp->cvc_attr.cause.v);
cop = cop2;
}
/*
* Terminate VCC
*/
atm_cm_closevc(cvp);
break;
case CVCS_REJECT:
case CVCS_RELEASE:
case CVCS_TERM:
/*
* Retry failed operation
*/
atm_cm_closevc(cvp);
break;
default:
logerr:
log(LOG_ERR,
"atm_cm_timeout: invalid state: cvp=%p, state=%d\n",
cvp, cvp->cvc_state);
}
}
/*
* CPCS User Control Commands
*
* This function is called by an endpoint user to pass a control command
* across a CPCS data API. Mostly we just send these down the stack.
*
* Arguments:
* cmd stack command code
* cop pointer to connection block
* arg argument
*
* Returns:
* 0 command output successful
* errno output failed - reason indicated
*
*/
int
atm_cm_cpcs_ctl(cmd, cop, arg)
int cmd;
Atm_connection *cop;
void *arg;
{
Atm_connvc *cvp;
int err = 0;
/*
* Validate connection state
*/
if (cop->co_state != COS_ACTIVE) {
err = EFAULT;
goto done;
}
cvp = cop->co_connvc;
if (cvp->cvc_state != CVCS_ACTIVE) {
err = EFAULT;
goto done;
}
if (cvp->cvc_attr.api != CMAPI_CPCS) {
err = EFAULT;
goto done;
}
switch (cmd) {
default:
err = EINVAL;
}
done:
return (err);
}
/*
* CPCS Data Output
*
* This function is called by an endpoint user to output a data packet
* across a CPCS data API. After we've validated the connection state, the
* packet will be encapsulated (if necessary) and sent down the data stack.
*
* Arguments:
* cop pointer to connection block
* m pointer to packet buffer chain to be output
*
* Returns:
* 0 packet output successful
* errno output failed - reason indicated
*
*/
int
atm_cm_cpcs_data(cop, m)
Atm_connection *cop;
KBuffer *m;
{
Atm_connvc *cvp;
struct attr_llc *llcp;
int err, space;
void *bp;
/*
* Validate connection state
*/
if (cop->co_state != COS_ACTIVE) {
err = EFAULT;
goto done;
}
cvp = cop->co_connvc;
if (cvp->cvc_state != CVCS_ACTIVE) {
err = EFAULT;
goto done;
}
if (cvp->cvc_attr.api != CMAPI_CPCS) {
err = EFAULT;
goto done;
}
/*
* Add any packet encapsulation
*/
switch (cop->co_mpx) {
case ATM_ENC_NULL:
/*
* None needed...
*/
break;
case ATM_ENC_LLC:
/*
* Need to add an LLC header
*/
llcp = &cop->co_llc;
/*
* See if there's room to add LLC header to front of packet.
*/
KB_HEADROOM(m, space);
if (space < llcp->v.llc_len) {
KBuffer *n;
/*
* We have to allocate another buffer and tack it
* onto the front of the packet
*/
MGETHDR(n, KB_F_NOWAIT, KB_T_HEADER);
if (n == 0) {
err = ENOMEM;
goto done;
}
KB_TAILALIGN(n, llcp->v.llc_len);
KB_LINKHEAD(n, m);
m = n;
} else {
/*
* Header fits, just adjust buffer controls
*/
KB_HEADADJ(m, llcp->v.llc_len);
}
/*
* Add the LLC header
*/
KB_DATASTART(m, bp, void *);
bcopy(llcp->v.llc_info, bp, llcp->v.llc_len);
KB_PLENADJ(m, llcp->v.llc_len);
break;
default:
panic("atm_cm_cpcs_data: mpx");
}
/*
* Finally, we can send the packet on its way
*/
STACK_CALL(CPCS_UNITDATA_INV, cvp->cvc_lower, cvp->cvc_tokl,
cvp, (intptr_t)m, 0, err);
done:
return (err);
}
/*
* Process CPCS Stack Commands
*
* This is the top of the CPCS API data stack. All upward stack commands
* for the CPCS data API will be received and processed here.
*
* Arguments:
* cmd stack command code
* tok session token (pointer to connection VCC control block)
* arg1 argument 1
* arg2 argument 2
*
* Returns:
* none
*
*/
static void
atm_cm_cpcs_upper(cmd, tok, arg1, arg2)
int cmd;
void *tok;
intptr_t arg1;
intptr_t arg2;
{
Atm_connection *cop;
Atm_connvc *cvp = tok;
KBuffer *m;
void *bp;
int s;
switch (cmd) {
case CPCS_UNITDATA_SIG:
/*
* Input data packet
*/
m = (KBuffer *)arg1;
if (cvp->cvc_state != CVCS_ACTIVE) {
if (cvp->cvc_state == CVCS_ACCEPT) {
KBuffer *n;
/*
* Queue up any packets received before sigmgr
* notifies us of incoming call completion
*/
if (cvp->cvc_rcvqlen >= CVC_RCVQ_MAX) {
KB_FREEALL(m);
atm_cm_stat.cms_rcvconnvc++;
return;
}
KB_QNEXT(m) = NULL;
if (cvp->cvc_rcvq == NULL) {
cvp->cvc_rcvq = m;
} else {
for (n = cvp->cvc_rcvq;
KB_QNEXT(n) != NULL;
n = KB_QNEXT(n))
;
KB_QNEXT(n) = m;
}
cvp->cvc_rcvqlen++;
return;
} else {
KB_FREEALL(m);
atm_cm_stat.cms_rcvconnvc++;
return;
}
}
/*
* Send the packet to the interface's bpf if this
* vc has one.
*/
if (cvp->cvc_vcc != NULL &&
cvp->cvc_vcc->vc_nif != NULL) {
struct ifnet *ifp =
(struct ifnet *)cvp->cvc_vcc->vc_nif;
BPF_MTAP(ifp, m);
}
/*
* Locate packet's connection
*/
cop = cvp->cvc_conn;
switch (cop->co_mpx) {
case ATM_ENC_NULL:
/*
* We're already there...
*/
break;
case ATM_ENC_LLC:
/*
* Find connection with matching LLC header
*/
if (KB_LEN(m) < T_ATM_LLC_MAX_LEN) {
KB_PULLUP(m, T_ATM_LLC_MAX_LEN, m);
if (m == 0) {
atm_cm_stat.cms_llcdrop++;
return;
}
}
KB_DATASTART(m, bp, void *);
s = splnet();
while (cop) {
if (bcmp(bp, cop->co_llc.v.llc_info,
cop->co_llc.v.llc_len) == 0)
break;
cop = cop->co_next;
}
(void) splx(s);
if (cop == NULL) {
/*
* No connected user for this LLC
*/
KB_FREEALL(m);
atm_cm_stat.cms_llcid++;
return;
}
/*
* Strip off the LLC header
*/
KB_HEADADJ(m, -cop->co_llc.v.llc_len);
KB_PLENADJ(m, -cop->co_llc.v.llc_len);
break;
default:
panic("atm_cm_cpcs_upper: mpx");
}
/*
* We've found our connection, so hand the packet off
*/
if (cop->co_state != COS_ACTIVE) {
KB_FREEALL(m);
atm_cm_stat.cms_rcvconn++;
return;
}
(*cop->co_endpt->ep_cpcs_data)(cop->co_toku, m);
break;
case CPCS_UABORT_SIG:
case CPCS_PABORT_SIG:
/*
* We don't support these (yet), so just FALLTHROUGH
*/
default:
log(LOG_ERR, "atm_cm_cpcs_upper: unknown cmd 0x%x\n", cmd);
}
}
/*
* SAAL User Control Commands
*
* This function is called by an endpoint user to pass a control command
* across a SAAL data API. Mostly we just send these down the stack.
*
* Arguments:
* cmd stack command code
* cop pointer to connection block
* arg argument
*
* Returns:
* 0 command output successful
* errno output failed - reason indicated
*
*/
int
atm_cm_saal_ctl(cmd, cop, arg)
int cmd;
Atm_connection *cop;
void *arg;
{
Atm_connvc *cvp;
int err = 0;
/*
* Validate connection state
*/
if (cop->co_state != COS_ACTIVE) {
err = EFAULT;
goto done;
}
cvp = cop->co_connvc;
if (cvp->cvc_state != CVCS_ACTIVE) {
err = EFAULT;
goto done;
}
if (cvp->cvc_attr.api != CMAPI_SAAL) {
err = EFAULT;
goto done;
}
switch (cmd) {
case SSCF_UNI_ESTABLISH_REQ:
case SSCF_UNI_RELEASE_REQ:
/*
* Pass command down the stack
*/
STACK_CALL(cmd, cvp->cvc_lower, cvp->cvc_tokl, cvp,
(intptr_t)arg, 0, err);
break;
default:
err = EINVAL;
}
done:
return (err);
}
/*
* SAAL Data Output
*
* This function is called by an endpoint user to output a data packet
* across a SAAL data API. After we've validated the connection state,
* the packet will be sent down the data stack.
*
* Arguments:
* cop pointer to connection block
* m pointer to packet buffer chain to be output
*
* Returns:
* 0 packet output successful
* errno output failed - reason indicated
*
*/
int
atm_cm_saal_data(cop, m)
Atm_connection *cop;
KBuffer *m;
{
Atm_connvc *cvp;
int err;
/*
* Validate connection state
*/
if (cop->co_state != COS_ACTIVE) {
err = EFAULT;
goto done;
}
cvp = cop->co_connvc;
if (cvp->cvc_state != CVCS_ACTIVE) {
err = EFAULT;
goto done;
}
if (cvp->cvc_attr.api != CMAPI_SAAL) {
err = EFAULT;
goto done;
}
/*
* Finally, we can send the packet on its way
*/
STACK_CALL(SSCF_UNI_DATA_REQ, cvp->cvc_lower, cvp->cvc_tokl,
cvp, (intptr_t)m, 0, err);
done:
return (err);
}
/*
* Process SAAL Stack Commands
*
* This is the top of the SAAL API data stack. All upward stack commands
* for the SAAL data API will be received and processed here.
*
* Arguments:
* cmd stack command code
* tok session token (pointer to connection VCC control block)
* arg1 argument 1
* arg2 argument 2
*
* Returns:
* none
*
*/
static void
atm_cm_saal_upper(cmd, tok, arg1, arg2)
int cmd;
void *tok;
intptr_t arg1;
intptr_t arg2;
{
Atm_connection *cop;
Atm_connvc *cvp = tok;
switch (cmd) {
case SSCF_UNI_ESTABLISH_IND:
case SSCF_UNI_ESTABLISH_CNF:
case SSCF_UNI_RELEASE_IND:
case SSCF_UNI_RELEASE_CNF:
/*
* Control commands
*/
cop = cvp->cvc_conn;
if (cvp->cvc_state != CVCS_ACTIVE)
break;
if (cop->co_state != COS_ACTIVE)
break;
(*cop->co_endpt->ep_saal_ctl)(cmd, cop->co_toku, (void *)arg1);
break;
case SSCF_UNI_DATA_IND:
/*
* User data
*/
cop = cvp->cvc_conn;
if (cvp->cvc_state != CVCS_ACTIVE) {
atm_cm_stat.cms_rcvconnvc++;
KB_FREEALL((KBuffer *)arg1);
break;
}
if (cop->co_state != COS_ACTIVE) {
atm_cm_stat.cms_rcvconn++;
KB_FREEALL((KBuffer *)arg1);
break;
}
(*cop->co_endpt->ep_saal_data)(cop->co_toku, (KBuffer *)arg1);
break;
case SSCF_UNI_UNITDATA_IND:
/*
* Not supported
*/
KB_FREEALL((KBuffer *)arg1);
/* FALLTHRU */
default:
log(LOG_ERR, "atm_cm_saal_upper: unknown cmd 0x%x\n", cmd);
}
}
/*
* SSCOP User Control Commands
*
* This function is called by an endpoint user to pass a control command
* across a SSCOP data API. Mostly we just send these down the stack.
*
* Arguments:
* cmd stack command code
* cop pointer to connection block
* arg1 argument
* arg2 argument
*
* Returns:
* 0 command output successful
* errno output failed - reason indicated
*
*/
int
atm_cm_sscop_ctl(cmd, cop, arg1, arg2)
int cmd;
Atm_connection *cop;
void *arg1;
void *arg2;
{
Atm_connvc *cvp;
int err = 0;
/*
* Validate connection state
*/
if (cop->co_state != COS_ACTIVE) {
err = EFAULT;
goto done;
}
cvp = cop->co_connvc;
if (cvp->cvc_state != CVCS_ACTIVE) {
err = EFAULT;
goto done;
}
if (cvp->cvc_attr.api != CMAPI_SSCOP) {
err = EFAULT;
goto done;
}
switch (cmd) {
case SSCOP_ESTABLISH_REQ:
case SSCOP_ESTABLISH_RSP:
case SSCOP_RELEASE_REQ:
case SSCOP_RESYNC_REQ:
case SSCOP_RESYNC_RSP:
case SSCOP_RECOVER_RSP:
case SSCOP_RETRIEVE_REQ:
/*
* Pass command down the stack
*/
STACK_CALL(cmd, cvp->cvc_lower, cvp->cvc_tokl, cvp,
(intptr_t)arg1, (intptr_t)arg2, err);
break;
default:
err = EINVAL;
}
done:
return (err);
}
/*
* SSCOP Data Output
*
* This function is called by an endpoint user to output a data packet
* across a SSCOP data API. After we've validated the connection state,
* the packet will be encapsulated and sent down the data stack.
*
* Arguments:
* cop pointer to connection block
* m pointer to packet buffer chain to be output
*
* Returns:
* 0 packet output successful
* errno output failed - reason indicated
*
*/
int
atm_cm_sscop_data(cop, m)
Atm_connection *cop;
KBuffer *m;
{
Atm_connvc *cvp;
int err;
/*
* Validate connection state
*/
if (cop->co_state != COS_ACTIVE) {
err = EFAULT;
goto done;
}
cvp = cop->co_connvc;
if (cvp->cvc_state != CVCS_ACTIVE) {
err = EFAULT;
goto done;
}
if (cvp->cvc_attr.api != CMAPI_SSCOP) {
err = EFAULT;
goto done;
}
/*
* Finally, we can send the packet on its way
*/
STACK_CALL(SSCOP_DATA_REQ, cvp->cvc_lower, cvp->cvc_tokl,
cvp, (intptr_t)m, 0, err);
done:
return (err);
}
/*
* Process SSCOP Stack Commands
*
* This is the top of the SSCOP API data stack. All upward stack commands
* for the SSCOP data API will be received and processed here.
*
* Arguments:
* cmd stack command code
* tok session token (pointer to connection VCC control block)
* arg1 argument 1
* arg2 argument 2
*
* Returns:
* none
*
*/
static void
atm_cm_sscop_upper(cmd, tok, arg1, arg2)
int cmd;
void *tok;
intptr_t arg1;
intptr_t arg2;
{
Atm_connection *cop;
Atm_connvc *cvp = tok;
switch (cmd) {
case SSCOP_ESTABLISH_IND:
case SSCOP_ESTABLISH_CNF:
case SSCOP_RELEASE_IND:
case SSCOP_RESYNC_IND:
/*
* Control commands
*/
cop = cvp->cvc_conn;
if ((cvp->cvc_state != CVCS_ACTIVE) ||
(cop->co_state != COS_ACTIVE)) {
KB_FREEALL((KBuffer *)arg1);
break;
}
(*cop->co_endpt->ep_sscop_ctl)
(cmd, cop->co_toku, (void *)arg1, (void *)arg2);
break;
case SSCOP_RELEASE_CNF:
case SSCOP_RESYNC_CNF:
case SSCOP_RECOVER_IND:
case SSCOP_RETRIEVE_IND:
case SSCOP_RETRIEVECMP_IND:
/*
* Control commands
*/
cop = cvp->cvc_conn;
if ((cvp->cvc_state != CVCS_ACTIVE) ||
(cop->co_state != COS_ACTIVE))
break;
(*cop->co_endpt->ep_sscop_ctl)
(cmd, cop->co_toku, (void *)arg1, (void *)arg2);
break;
case SSCOP_DATA_IND:
/*
* User data
*/
cop = cvp->cvc_conn;
if (cvp->cvc_state != CVCS_ACTIVE) {
atm_cm_stat.cms_rcvconnvc++;
KB_FREEALL((KBuffer *)arg1);
break;
}
if (cop->co_state != COS_ACTIVE) {
atm_cm_stat.cms_rcvconn++;
KB_FREEALL((KBuffer *)arg1);
break;
}
(*cop->co_endpt->ep_sscop_data)
(cop->co_toku, (KBuffer *)arg1, arg2);
break;
case SSCOP_UNITDATA_IND:
/*
* Not supported
*/
KB_FREEALL((KBuffer *)arg1);
/* FALLTHRU */
default:
log(LOG_ERR, "atm_cm_sscop_upper: unknown cmd 0x%x\n", cmd);
}
}
/*
* Register an ATM Endpoint Service
*
* Every ATM endpoint service must register itself here before it can
* issue or receive any connection requests.
*
* Arguments:
* epp pointer to endpoint definition structure
*
* Returns:
* 0 registration successful
* errno registration failed - reason indicated
*
*/
int
atm_endpoint_register(epp)
Atm_endpoint *epp;
{
int s = splnet();
/*
* See if we need to be initialized
*/
if (!atm_init)
atm_initialize();
/*
* Validate endpoint
*/
if (epp->ep_id > ENDPT_MAX) {
(void) splx(s);
return (EINVAL);
}
if (atm_endpoints[epp->ep_id] != NULL) {
(void) splx(s);
return (EEXIST);
}
/*
* Add endpoint to list
*/
atm_endpoints[epp->ep_id] = epp;
(void) splx(s);
return (0);
}
/*
* De-register an ATM Endpoint Service
*
* Each ATM endpoint service provider must de-register its registered
* endpoint(s) before terminating. Specifically, loaded kernel modules
* must de-register their services before unloading themselves.
*
* Arguments:
* epp pointer to endpoint definition structure
*
* Returns:
* 0 de-registration successful
* errno de-registration failed - reason indicated
*
*/
int
atm_endpoint_deregister(epp)
Atm_endpoint *epp;
{
int s = splnet();
/*
* Validate endpoint
*/
if (epp->ep_id > ENDPT_MAX) {
(void) splx(s);
return (EINVAL);
}
if (atm_endpoints[epp->ep_id] != epp) {
(void) splx(s);
return (ENOENT);
}
/*
* Remove endpoint from list
*/
atm_endpoints[epp->ep_id] = NULL;
(void) splx(s);
return (0);
}
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