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