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558 lines
12 KiB
C
558 lines
12 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*
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* @(#) $Id: spans_proto.c,v 1.2 1998/09/17 09:35:00 phk Exp $
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*
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*/
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/*
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* SPANS Signalling Manager
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* ---------------------------
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*
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* SPANS protocol processing module.
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*
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*/
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#include <netatm/kern_include.h>
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#include "spans_xdr.h"
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#include <netatm/spans/spans_var.h>
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#ifndef lint
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__RCSID("@(#) $Id: spans_proto.c,v 1.2 1998/09/17 09:35:00 phk Exp $");
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#endif
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/*
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* Internal functions
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*/
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caddr_t spans_getname __P((void *));
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void spans_connected __P((void *));
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void spans_cleared __P((void *, struct t_atm_cause *));
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void spans_cpcs_data __P((void *, KBuffer *));
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/*
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* ATM endpoint for SPANS signalling channel
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*/
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static Atm_endpoint spans_endpt = {
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NULL, /* ep_next */
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ENDPT_SPANS_SIG, /* ep_id */
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NULL, /* ep_ioctl */
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spans_getname, /* ep_getname */
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spans_connected, /* ep_connected */
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spans_cleared, /* ep_cleared */
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NULL, /* ep_incoming */
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NULL, /* ep_addparty */
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NULL, /* ep_dropparty */
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NULL, /* ep_cpcs_ctl */
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spans_cpcs_data, /* ep_cpcs_data */
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NULL, /* ep_saal_ctl */
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NULL, /* ep_saal_data */
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NULL, /* ep_sscop_ctl */
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NULL /* ep_sscop_data */
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};
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/*
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* ATM connection attributes for UNI signalling channel
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*/
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static Atm_attributes spans_attr = {
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NULL, /* nif */
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CMAPI_CPCS, /* api */
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0, /* api_init */
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0, /* headin */
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0, /* headout */
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{ /* aal */
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T_ATM_PRESENT, /* aal.tag */
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ATM_AAL3_4 /* aal.aal_type */
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},
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{ /* traffic */
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T_ATM_PRESENT, /* traffic.tag */
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{ /* traffic.v */
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{ /* traffic.v.forward */
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T_ATM_ABSENT, /* PCR_high */
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0, /* PCR_all */
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T_ATM_ABSENT, /* SCR_high */
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T_ATM_ABSENT, /* SCR_all */
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T_ATM_ABSENT, /* MBS_high */
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T_ATM_ABSENT, /* MBS_all */
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T_NO, /* tagging */
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},
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{ /* traffic.v.backward */
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T_ATM_ABSENT, /* PCR_high */
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0, /* PCR_all */
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T_ATM_ABSENT, /* SCR_high */
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T_ATM_ABSENT, /* SCR_all */
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T_ATM_ABSENT, /* MBS_high */
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T_ATM_ABSENT, /* MBS_all */
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T_NO, /* tagging */
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},
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T_YES, /* best_effort */
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}
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},
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{ /* bearer */
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T_ATM_PRESENT, /* bearer.tag */
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{ /* bearer.v */
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T_ATM_CLASS_X, /* class */
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T_ATM_NULL, /* traffic_type */
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T_ATM_NO_END_TO_END, /* timing_req */
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T_NO, /* clipping */
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T_ATM_1_TO_1, /* conn_conf */
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}
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},
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{ /* bhli */
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T_ATM_ABSENT, /* bhli.tag */
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},
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{ /* blli */
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T_ATM_ABSENT, /* blli.tag_l2 */
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T_ATM_ABSENT, /* blli.tag_l3 */
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},
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{ /* llc */
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T_ATM_ABSENT, /* llc.tag */
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},
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{ /* called */
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T_ATM_PRESENT, /* called.tag */
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},
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{ /* calling */
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T_ATM_ABSENT, /* calling.tag */
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},
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{ /* qos */
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T_ATM_PRESENT, /* qos.tag */
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{ /* qos.v */
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T_ATM_NETWORK_CODING, /* coding_standard */
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{ /* qos.v.forward */
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T_ATM_QOS_CLASS_0, /* class */
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},
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{ /* qos.v.backward */
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T_ATM_QOS_CLASS_0, /* class */
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}
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}
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},
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{ /* transit */
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T_ATM_ABSENT, /* transit.tag */
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},
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{ /* cause */
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T_ATM_ABSENT, /* cause.tag */
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}
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};
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/*
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* SPANS cause structre
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*/
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struct t_atm_cause spans_cause = {
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T_ATM_ITU_CODING, /* coding_standard */
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T_ATM_LOC_USER, /* location */
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T_ATM_CAUSE_UNSPECIFIED_NORMAL, /* cause_value */
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{ 0, 0, 0, 0 } /* diagnostics */
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};
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/*
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* Process a SPANS timeout
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*
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* Called when a previously scheduled spans control block timer expires.
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* Processing will based on the current SPANS state.
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*
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* Called at splnet.
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*
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* Arguments:
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* tip pointer to spans timer control block
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*
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* Returns:
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* none
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*
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*/
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void
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spans_timer(tip)
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struct atm_time *tip;
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{
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struct spans *spp;
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spans_msg *msg;
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Atm_addr_pvc *pvcp;
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int err;
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/*
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* Back-off to SPANS control block
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*/
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spp = (struct spans *)
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((caddr_t)tip - (int)(&((struct spans *)0)->sp_time));
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ATM_DEBUG2("spans_timer: spp=%p,state=%d\n",
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spp, spp->sp_state);
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/*
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* Process timeout based on protocol state
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*/
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switch (spp->sp_state) {
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case SPANS_INIT:
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/*
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* Open signalling channel
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*/
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spans_attr.nif = spp->sp_pif->pif_nif;
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spans_attr.aal.v.aal4.forward_max_SDU_size =
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ATM_NIF_MTU;
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spans_attr.aal.v.aal4.backward_max_SDU_size =
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ATM_NIF_MTU;
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spans_attr.aal.v.aal4.SSCS_type =
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T_ATM_SSCS_SSCOP_UNREL;
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spans_attr.aal.v.aal4.mid_low = 0;
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spans_attr.aal.v.aal4.mid_high = 0;
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spans_attr.called.tag = T_ATM_PRESENT;
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spans_attr.called.addr.address_format = T_ATM_PVC_ADDR;
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spans_attr.called.addr.address_length =
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sizeof(Atm_addr_pvc);
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pvcp = (Atm_addr_pvc *)spans_attr.called.addr.address;
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ATM_PVC_SET_VPI(pvcp, SPANS_SIG_VPI);
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ATM_PVC_SET_VCI(pvcp, SPANS_SIG_VCI);
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spans_attr.called.subaddr.address_format = T_ATM_ABSENT;
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spans_attr.called.subaddr.address_length = 0;
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spans_attr.traffic.v.forward.PCR_all_traffic =
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spp->sp_pif->pif_pcr;
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spans_attr.traffic.v.backward.PCR_all_traffic =
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spp->sp_pif->pif_pcr;
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err = atm_cm_connect(&spans_endpt, spp, &spans_attr,
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&spp->sp_conn);
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if (err) {
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log(LOG_CRIT, "spans: signalling channel setup failed\n");
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return;
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}
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/*
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* Signalling channel open, start probing
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*/
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spp->sp_state = SPANS_PROBE;
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/* FALLTHRU */
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case SPANS_PROBE:
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case SPANS_ACTIVE:
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/*
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* Send out SPANS_STAT_REQ message
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*/
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msg = (spans_msg *)atm_allocate(&spans_msgpool);
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if (msg == NULL) {
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/* Retry later if no memory */
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SPANS_TIMER(spp, SPANS_PROBE_ERR_WAIT);
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break;
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}
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msg->sm_vers = SPANS_VERS_1_0;
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msg->sm_type = SPANS_STAT_REQ;
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msg->sm_stat_req.streq_es_epoch = spp->sp_h_epoch;
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if (spans_send_msg(spp, msg)) {
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/* Retry later if send fails */
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SPANS_TIMER(spp, SPANS_PROBE_ERR_WAIT);
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atm_free(msg);
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break;
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}
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atm_free(msg);
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spp->sp_probe_ct++;
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/*
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* Check whether we're getting an answer to our probes
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*/
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if (spp->sp_state == SPANS_ACTIVE &&
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spp->sp_probe_ct > SPANS_PROBE_THRESH) {
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/*
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* Interface is down, notify VCC owners
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*/
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spans_switch_reset(spp, SPANS_UNI_DOWN);
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/*
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* Set new state and increment host epoch so
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* switch knows we reset everyting.
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*/
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spp->sp_state = SPANS_PROBE;
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spp->sp_h_epoch++;
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spp->sp_s_epoch = 0;
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}
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/*
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* Keep sending status requests
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*/
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SPANS_TIMER(spp, SPANS_PROBE_INTERVAL);
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break;
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case SPANS_DETACH:
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/*
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* Try to terminate the SPANS signalling PVC
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*/
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err = atm_cm_release(spp->sp_conn, &spans_cause);
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if (err) {
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log(LOG_ERR, "spans: can't close signalling channel\n");
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}
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break;
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default:
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log(LOG_ERR, "spans: timer state: spp=%p, state=%d\n",
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spp, spp->sp_state);
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}
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}
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/*
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* Process a SPANS VCC timeout
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*
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* Called when a previously scheduled SPANS VCCB timer expires.
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* Processing will based on the current VCC state.
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*
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* Called at splnet.
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*
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* Arguments:
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* tip pointer to vccb timer control block
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*
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* Returns:
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* none
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*
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*/
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void
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spans_vctimer(tip)
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struct atm_time *tip;
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{
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int err;
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struct spans *spp;
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struct spans_vccb *svp;
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/*
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* Get VCCB and SPANS control block addresses
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*/
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svp = (struct spans_vccb *) ((caddr_t)tip -
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(int)(&((struct vccb *)0)->vc_time));
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spp = (struct spans *)svp->sv_pif->pif_siginst;
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ATM_DEBUG3("spans_vctimer: svp=%p, sstate=%d, ustate=%d\n",
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svp, svp->sv_sstate, svp->sv_ustate);
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/*
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* Process timeout based on protocol state
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*/
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switch (svp->sv_sstate) {
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case SPANS_VC_ABORT:
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/*
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* Kill the VCCB and notify the owner
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*/
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err = spans_clear_vcc(spp, svp);
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break;
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case SPANS_VC_FREE:
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/*
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* Free VCCB storage
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*/
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svp->sv_ustate = VCCU_CLOSED;
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svp->sv_sstate = SPANS_VC_FREE;
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spans_free((struct vccb *)svp);
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break;
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case SPANS_VC_POPEN:
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/*
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* Issued open request, but didn't get response.
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*/
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if (svp->sv_retry < SV_MAX_RETRY) {
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/*
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* Retransmit the open request
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*/
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err = spans_send_open_req(spp, svp);
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svp->sv_retry++;
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SPANS_VC_TIMER((struct vccb *) svp, SV_TIMEOUT);
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} else {
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/*
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* Retry limit exceeded--report the open failed
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*/
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svp->sv_ustate = VCCU_CLOSED;
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svp->sv_sstate = SPANS_VC_FREE;
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svp->sv_connvc->cvc_attr.cause.tag =
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T_ATM_PRESENT;
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svp->sv_connvc->cvc_attr.cause.v.coding_standard =
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T_ATM_ITU_CODING;
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svp->sv_connvc->cvc_attr.cause.v.location =
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T_ATM_LOC_USER;
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svp->sv_connvc->cvc_attr.cause.v.cause_value =
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T_ATM_CAUSE_NO_USER_RESPONDING;
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KM_ZERO(svp->sv_connvc->cvc_attr.cause.v.diagnostics,
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sizeof(svp->sv_connvc->cvc_attr.cause.v.diagnostics));
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atm_cm_cleared(svp->sv_connvc);
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}
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break;
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case SPANS_VC_CLOSE:
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/*
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* Issued close request, but didn't get response.
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*/
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if (svp->sv_retry < SV_MAX_RETRY) {
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/*
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* Retransmit the close request
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*/
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err = spans_send_close_req(spp, svp);
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svp->sv_retry++;
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SPANS_VC_TIMER((struct vccb *) svp, SV_TIMEOUT);
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} else {
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/*
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* Retry limit exceeded--just finish the close
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*/
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svp->sv_sstate = SPANS_VC_FREE;
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svp->sv_connvc->cvc_attr.cause.tag = T_ATM_PRESENT;
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svp->sv_connvc->cvc_attr.cause.v.coding_standard =
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T_ATM_ITU_CODING;
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svp->sv_connvc->cvc_attr.cause.v.location =
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T_ATM_LOC_USER;
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svp->sv_connvc->cvc_attr.cause.v.cause_value =
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T_ATM_CAUSE_NO_USER_RESPONDING;
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KM_ZERO(svp->sv_connvc->cvc_attr.cause.v.diagnostics,
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sizeof(svp->sv_connvc->cvc_attr.cause.v.diagnostics));
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atm_cm_cleared(svp->sv_connvc);
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}
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break;
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case SPANS_VC_ACTIVE:
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case SPANS_VC_ACT_DOWN:
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/*
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* Shouldn't happen
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*/
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log(LOG_ERR, "spans_vctimer: unexpected state %d\n",
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svp->sv_sstate);
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break;
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default:
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log(LOG_ERR, "spans: vctimer state: svp=%p, sstate=%d\n",
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svp, svp->sv_sstate);
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}
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}
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/*
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* SPANS name routine
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*
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* Arguments:
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* tok SPANS signalling channel token (ignored)
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*
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* Returns:
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* pointer to a string identifying the SPANS signalling manager
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*
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*/
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caddr_t
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spans_getname(tok)
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void *tok;
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{
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return("SPANS");
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}
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/*
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* Process a VCC connection notification
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*
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* Should never be called
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*
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* Arguments:
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* tok user's connection token (SPANS protocol block)
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*
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* Returns:
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* none
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*
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*/
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void
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spans_connected(tok)
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void *tok;
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{
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struct spans *spp = (struct spans *)tok;
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ATM_DEBUG2("spans_connected: spp=%p,state=%d\n",
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spp, spp->sp_state);
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/*
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* Connected routine shouldn't ever get called for a PVC
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*/
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log(LOG_ERR, "spans: connected function called, tok=%p\n", spp);
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}
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/*
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* Process a VCC close notification
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*
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* Called when the SPANS signalling channel is closed
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*
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* Arguments:
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* tok user's connection token (spans protocol block)
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* cp pointer to cause structure
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*
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* Returns:
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* none
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*
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*/
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void
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spans_cleared(tok, cp)
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void *tok;
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struct t_atm_cause *cp;
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{
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struct spans *spp = (struct spans *)tok;
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/*
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* VCC has been closed.
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*/
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log(LOG_ERR, "spans: signalling channel closed\n");
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SPANS_CANCEL(spp);
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spp->sp_conn = 0;
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}
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/*
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* SPANS CPCS data handler
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*
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* This is the module which receives data on the SPANS signalling
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* channel. Processing is based on the indication received from the
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* AAL and the protocol state.
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*
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* Arguments:
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* tok session token (pointer to spans protocol control block)
|
|
* m pointer to buffer with data
|
|
*
|
|
* Returns:
|
|
* none
|
|
*
|
|
*/
|
|
void
|
|
spans_cpcs_data(tok, m)
|
|
void *tok;
|
|
KBuffer *m;
|
|
{
|
|
struct spans *spp = tok;
|
|
|
|
ATM_DEBUG3("spans_cpcs_data: spp=%p,state=%d,m=%p,\n",
|
|
spp, spp->sp_state, m);
|
|
|
|
/*
|
|
* Process data
|
|
*/
|
|
spans_rcv_msg(spp, m);
|
|
}
|