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/*
* Copyright (c) 1996-2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Author: Hartmut Brandt <harti@freebsd.org>
*
* $Begemot: libunimsg/netnatm/saal/saal_sscfu.c,v 1.4 2004/07/08 08:22:10 brandt Exp $
*
* SSCF on the UNI
*/
#include <netnatm/saal/sscfu.h>
#include <netnatm/saal/sscfupriv.h>
#define MKSTR(S) #S
static const char *const sscf_sigs[] = {
MKSTR(SAAL_ESTABLISH_request),
MKSTR(SAAL_ESTABLISH_indication),
MKSTR(SAAL_ESTABLISH_confirm),
MKSTR(SAAL_RELEASE_request),
MKSTR(SAAL_RELEASE_confirm),
MKSTR(SAAL_RELEASE_indication),
MKSTR(SAAL_DATA_request),
MKSTR(SAAL_DATA_indication),
MKSTR(SAAL_UDATA_request),
MKSTR(SAAL_UDATA_indication),
};
static const char *const sscf_states[] = {
MKSTR(SSCF_RELEASED),
MKSTR(SSCF_AWAITING_ESTABLISH),
MKSTR(SSCF_AWAITING_RELEASE),
MKSTR(SSCF_ESTABLISHED),
MKSTR(SSCF_RESYNC),
};
#define AA_SIG(S,G,M) \
((S)->funcs->send_upper((S), (S)->aarg, (G), (M)))
#define SSCOP_AASIG(S,G,M,P) \
((S)->funcs->send_lower((S), (S)->aarg, (G), (M), (P)))
MEMINIT();
static void sscfu_unqueue(struct sscfu *sscf);
/************************************************************/
/*
* INSTANCE AND CLASS MANAGEMENT
*/
/*
* Initialize SSCF.
*/
struct sscfu *
sscfu_create(void *a, const struct sscfu_funcs *funcs)
{
struct sscfu *sscf;
MEMZALLOC(sscf, struct sscfu *, sizeof(struct sscfu));
if (sscf == NULL)
return (NULL);
sscf->funcs = funcs;
sscf->aarg = a;
sscf->state = SSCFU_RELEASED;
sscf->inhand = 0;
SIGQ_INIT(&sscf->sigs);
sscf->debug = 0;
return (sscf);
}
/*
* Reset the instance. Call only if you know, what you're doing.
*/
void
sscfu_reset(struct sscfu *sscf)
{
sscf->state = SSCFU_RELEASED;
sscf->inhand = 0;
SIGQ_CLEAR(&sscf->sigs);
}
/*
* Destroy SSCF
*/
void
sscfu_destroy(struct sscfu *sscf)
{
SIGQ_CLEAR(&sscf->sigs);
MEMFREE(sscf);
}
enum sscfu_state
sscfu_getstate(const struct sscfu *sscf)
{
return (sscf->state);
}
u_int
sscfu_getdefparam(struct sscop_param *p)
{
memset(p, 0, sizeof(*p));
p->timer_cc = 1000;
p->timer_poll = 750;
p->timer_keep_alive = 2000;
p->timer_no_response = 7000;
p->timer_idle = 15000;
p->maxk = 4096;
p->maxj = 4096;
p->maxcc = 4;
p->maxpd = 25;
return (SSCOP_SET_TCC | SSCOP_SET_TPOLL | SSCOP_SET_TKA |
SSCOP_SET_TNR | SSCOP_SET_TIDLE | SSCOP_SET_MAXK |
SSCOP_SET_MAXJ | SSCOP_SET_MAXCC | SSCOP_SET_MAXPD);
}
const char *
sscfu_signame(enum saal_sig sig)
{
static char str[40];
if (sig >= sizeof(sscf_sigs)/sizeof(sscf_sigs[0])) {
sprintf(str, "BAD SAAL_SIGNAL %u", sig);
return (str);
} else {
return (sscf_sigs[sig]);
}
}
const char *
sscfu_statename(enum sscfu_state s)
{
static char str[40];
if (s >= sizeof(sscf_states)/sizeof(sscf_states[0])) {
sprintf(str, "BAD SSCFU state %u", s);
return (str);
} else {
return (sscf_states[s]);
}
}
/************************************************************/
/*
* EXTERNAL INPUT SIGNAL MAPPING
*/
static __inline void
set_state(struct sscfu *sscf, enum sscfu_state state)
{
VERBOSE(sscf, SSCFU_DBG_STATE, (sscf, sscf->aarg,
"change state from %s to %s",
sscf_states[sscf->state], sscf_states[state]));
sscf->state = state;
}
/*
* signal from SSCOP to SSCF
* Message must be freed by the user specified handler, if
* it is passed.
*/
void
sscfu_input(struct sscfu *sscf, enum sscop_aasig sig,
struct SSCFU_MBUF_T *m, u_int arg __unused)
{
sscf->inhand = 1;
VERBOSE(sscf, SSCFU_DBG_LSIG, (sscf, sscf->aarg,
"SSCF got signal %d. in state %s", sig, sscf_states[sscf->state]));
switch (sig) {
case SSCOP_RELEASE_indication:
/* arg is: UU, SRC */
switch (sscf->state) {
case SSCFU_RELEASED:
if (m)
MBUF_FREE(m);
goto badsig;
case SSCFU_AWAITING_ESTABLISH:
set_state(sscf, SSCFU_RELEASED);
AA_SIG(sscf, SAAL_RELEASE_indication, m);
break;
case SSCFU_AWAITING_RELEASE:
if (m)
MBUF_FREE(m);
goto badsig;
case SSCFU_ESTABLISHED:
set_state(sscf, SSCFU_RELEASED);
AA_SIG(sscf, SAAL_RELEASE_indication, m);
break;
case SSCFU_RESYNC:
set_state(sscf, SSCFU_RELEASED);
AA_SIG(sscf, SAAL_RELEASE_indication, m);
break;
}
break;
case SSCOP_ESTABLISH_indication:
/* arg is: UU */
switch (sscf->state) {
case SSCFU_RELEASED:
set_state(sscf, SSCFU_ESTABLISHED);
SSCOP_AASIG(sscf, SSCOP_ESTABLISH_response, NULL, 1);
AA_SIG(sscf, SAAL_ESTABLISH_indication, m);
break;
case SSCFU_AWAITING_ESTABLISH:
case SSCFU_AWAITING_RELEASE:
case SSCFU_ESTABLISHED:
case SSCFU_RESYNC:
if (m)
MBUF_FREE(m);
goto badsig;
}
break;
case SSCOP_ESTABLISH_confirm:
/* arg is: UU */
switch (sscf->state) {
case SSCFU_RELEASED:
if (m)
MBUF_FREE(m);
goto badsig;
case SSCFU_AWAITING_ESTABLISH:
set_state(sscf, SSCFU_ESTABLISHED);
AA_SIG(sscf, SAAL_ESTABLISH_confirm, m);
break;
case SSCFU_AWAITING_RELEASE:
case SSCFU_ESTABLISHED:
case SSCFU_RESYNC:
if (m)
MBUF_FREE(m);
goto badsig;
}
break;
case SSCOP_RELEASE_confirm:
/* arg is: */
switch (sscf->state) {
case SSCFU_RELEASED:
case SSCFU_AWAITING_ESTABLISH:
goto badsig;
case SSCFU_AWAITING_RELEASE:
set_state(sscf, SSCFU_RELEASED);
AA_SIG(sscf, SAAL_RELEASE_confirm, NULL);
break;
case SSCFU_ESTABLISHED:
case SSCFU_RESYNC:
goto badsig;
}
break;
case SSCOP_DATA_indication:
/* arg is: MU */
sscf->funcs->window(sscf, sscf->aarg, 1);
switch (sscf->state) {
case SSCFU_RELEASED:
case SSCFU_AWAITING_ESTABLISH:
case SSCFU_AWAITING_RELEASE:
MBUF_FREE(m);
goto badsig;
case SSCFU_ESTABLISHED:
AA_SIG(sscf, SAAL_DATA_indication, m);
break;
case SSCFU_RESYNC:
MBUF_FREE(m);
goto badsig;
}
break;
case SSCOP_RECOVER_indication:
/* arg is: */
switch (sscf->state) {
case SSCFU_RELEASED:
case SSCFU_AWAITING_ESTABLISH:
case SSCFU_AWAITING_RELEASE:
goto badsig;
case SSCFU_ESTABLISHED:
SSCOP_AASIG(sscf, SSCOP_RECOVER_response, NULL, 0);
AA_SIG(sscf, SAAL_ESTABLISH_indication, NULL);
break;
case SSCFU_RESYNC:
goto badsig;
}
break;
case SSCOP_RESYNC_indication:
/* arg is: UU */
switch (sscf->state) {
case SSCFU_RELEASED:
case SSCFU_AWAITING_ESTABLISH:
case SSCFU_AWAITING_RELEASE:
if (m)
MBUF_FREE(m);
goto badsig;
case SSCFU_ESTABLISHED:
SSCOP_AASIG(sscf, SSCOP_RESYNC_response, NULL, 0);
AA_SIG(sscf, SAAL_ESTABLISH_indication, m);
break;
case SSCFU_RESYNC:
if (m)
MBUF_FREE(m);
goto badsig;
}
break;
case SSCOP_RESYNC_confirm:
/* arg is: */
switch (sscf->state) {
case SSCFU_RELEASED:
case SSCFU_AWAITING_ESTABLISH:
case SSCFU_AWAITING_RELEASE:
case SSCFU_ESTABLISHED:
case SSCFU_RESYNC:
set_state(sscf, SSCFU_ESTABLISHED);
AA_SIG(sscf, SAAL_ESTABLISH_confirm, NULL);
break;
}
break;
case SSCOP_UDATA_indication:
/* arg is: MD */
AA_SIG(sscf, SAAL_UDATA_indication, m);
break;
case SSCOP_RETRIEVE_indication:
if (m)
MBUF_FREE(m);
goto badsig;
case SSCOP_RETRIEVE_COMPL_indication:
goto badsig;
case SSCOP_ESTABLISH_request:
case SSCOP_RELEASE_request:
case SSCOP_ESTABLISH_response:
case SSCOP_DATA_request:
case SSCOP_RECOVER_response:
case SSCOP_RESYNC_request:
case SSCOP_RESYNC_response:
case SSCOP_UDATA_request:
case SSCOP_RETRIEVE_request:
ASSERT(0);
break;
}
sscfu_unqueue(sscf);
return;
badsig:
VERBOSE(sscf, SSCFU_DBG_ERR, (sscf, sscf->aarg,
"bad signal %d. in state %s", sig, sscf_states[sscf->state]));
sscfu_unqueue(sscf);
}
/*
* Handle signals from the user
*/
static void
sscfu_dosig(struct sscfu *sscf, enum saal_sig sig, struct SSCFU_MBUF_T *m)
{
VERBOSE(sscf, SSCFU_DBG_EXEC, (sscf, sscf->aarg,
"executing signal %s(%s)",
sscf_sigs[sig], sscf_states[sscf->state]));
switch (sig) {
case SAAL_ESTABLISH_request:
/* arg is opt UU */
switch (sscf->state) {
case SSCFU_RELEASED:
set_state(sscf, SSCFU_AWAITING_ESTABLISH);
SSCOP_AASIG(sscf, SSCOP_ESTABLISH_request, m, 1);
break;
case SSCFU_AWAITING_ESTABLISH:
if (m)
MBUF_FREE(m);
goto badsig;
case SSCFU_AWAITING_RELEASE:
set_state(sscf, SSCFU_AWAITING_ESTABLISH);
SSCOP_AASIG(sscf, SSCOP_ESTABLISH_request, m, 1);
break;
case SSCFU_ESTABLISHED:
set_state(sscf, SSCFU_RESYNC);
SSCOP_AASIG(sscf, SSCOP_RESYNC_request, m, 0);
break;
case SSCFU_RESYNC:
if (m)
MBUF_FREE(m);
goto badsig;
}
break;
case SAAL_RELEASE_request:
/* arg is opt UU */
switch(sscf->state) {
case SSCFU_RELEASED:
if (m)
MBUF_FREE(m);
AA_SIG(sscf, SAAL_RELEASE_confirm, NULL);
break;
case SSCFU_AWAITING_ESTABLISH:
set_state(sscf, SSCFU_AWAITING_RELEASE);
SSCOP_AASIG(sscf, SSCOP_RELEASE_request, m, 0);
break;
case SSCFU_AWAITING_RELEASE:
if (m)
MBUF_FREE(m);
goto badsig;
case SSCFU_ESTABLISHED:
set_state(sscf, SSCFU_AWAITING_RELEASE);
SSCOP_AASIG(sscf, SSCOP_RELEASE_request, m, 0);
break;
case SSCFU_RESYNC:
set_state(sscf, SSCFU_AWAITING_RELEASE);
SSCOP_AASIG(sscf, SSCOP_RELEASE_request, m, 0);
break;
}
break;
case SAAL_DATA_request:
/* arg is DATA */
switch (sscf->state) {
case SSCFU_RELEASED:
case SSCFU_AWAITING_ESTABLISH:
case SSCFU_AWAITING_RELEASE:
MBUF_FREE(m);
goto badsig;
case SSCFU_ESTABLISHED:
SSCOP_AASIG(sscf, SSCOP_DATA_request, m, 0);
break;
case SSCFU_RESYNC:
MBUF_FREE(m);
goto badsig;
}
break;
case SAAL_UDATA_request:
/* arg is UDATA */
SSCOP_AASIG(sscf, SSCOP_UDATA_request, m, 0);
break;
case SAAL_ESTABLISH_indication:
case SAAL_ESTABLISH_confirm:
case SAAL_RELEASE_confirm:
case SAAL_RELEASE_indication:
case SAAL_DATA_indication:
case SAAL_UDATA_indication:
ASSERT(0);
break;
}
return;
badsig:
VERBOSE(sscf, SSCFU_DBG_ERR, (sscf, sscf->aarg,
"bad signal %s in state %s", sscf_sigs[sig],
sscf_states[sscf->state]));
}
/*
* Handle user signal.
*/
int
sscfu_saalsig(struct sscfu *sscf, enum saal_sig sig, struct SSCFU_MBUF_T *m)
{
struct sscfu_sig *s;
if (sscf->inhand) {
VERBOSE(sscf, SSCFU_DBG_EXEC, (sscf, sscf->aarg,
"queuing user signal %s(%s)",
sscf_sigs[sig], sscf_states[sscf->state]));
SIG_ALLOC(s);
if (s == NULL)
return (ENOMEM);
s->sig = sig;
s->m = m;
SIGQ_APPEND(&sscf->sigs, s);
return (0);
}
sscf->inhand = 1;
sscfu_dosig(sscf, sig, m);
sscfu_unqueue(sscf);
return (0);
}
/*
* Unqueue all qeueued signals. Must be called with inhand==1.
*/
static void
sscfu_unqueue(struct sscfu *sscf)
{
struct sscfu_sig *s;
while ((s = SIGQ_GET(&sscf->sigs)) != NULL) {
sscfu_dosig(sscf, s->sig, s->m);
SIG_FREE(s);
}
sscf->inhand = 0;
}
void
sscfu_setdebug(struct sscfu *sscf, u_int n)
{
sscf->debug = n;
}
u_int
sscfu_getdebug(const struct sscfu *sscf)
{
return (sscf->debug);
}